Glasses lens, glasses, glasses lens manufacturing method, and optical member

Abstract

Provided are a glasses lens having an object-side surface and an eyeball-side surface, and technology related thereto, said glasses lens having a lens base material and an optical interference layer that is provided to at least one of the surfaces of the lens base material and that has a multilayer structure, wherein: at least one surface among the surface(s) of the glasses lens provided with the optical interference layer has a first region in which removed portions where at least one layer of the optical interference layer is locally removed are arranged with a first regularity and in which a non-removed portion where said layer is not removed is present between the removed portions, and a second region which is either a region in which the removed portions are arranged with a second regularity or a region composed of the non-removed portion; and the first region and the second region are seen as regions whose color tones differ from each other.

Description

Eyeglass lenses, eyeglasses, method for manufacturing eyeglass lenses, and optical components

[0001] The present specification is deemed to include the entire contents of Japanese Patent Application No. 2023-223197. Any content not disclosed in this specification can be referenced from the description of Japanese Patent Application No. 2023-223197.

[0002] The present disclosure relates to eyeglass lenses, eyeglasses, methods for manufacturing eyeglass lenses, and optical members.

[0003] As is well known, eyeglasses are used by wearers to correct their eyesight or protect their eyes from strong light through eyeglass lenses, so it has been difficult to decorate eyeglass lenses without obstructing the wearer's vision.

[0004] On the other hand, Patent Document 1 proposes that marking be performed on an eyeglass lens by partially removing a portion of a layer formed on the eyeglass lens using a laser beam marking machine, as a permanent visible marking on an optical product coated with a multilayer interference coating, typically an eyeglass lens.

[0005] Special table 2019-523447 publication

[0006] 8 and 9 of the above-mentioned Patent Document 1 show that an optical product can be obtained that includes a marking pattern formed by locally removing an interference coating with a laser in the shape of a predetermined character. In other words, the eyeglass lens shown in Patent Document 1 is composed of two types of parts: a part where the interference coating has been locally removed, and a part where the interference coating has not been removed (a part where the interference coating remains intact). This means that when a third party (a person other than the lens wearer, an observer) looks at the eyeglass lens in a worn state from the object side, only two types of color tones appear.

[0007] In one embodiment of the present invention, an object is to increase the variety of color tones in eyeglass lenses that employ localized partial removal of an optical interference layer, compared to conventional eyeglass lenses. From another perspective, an object is to provide eyeglass lenses, eyeglasses, and a method for manufacturing eyeglass lenses that enable not only technical or commercial markings but also decorations of desired designs such as letters, symbols, and patterns to be applied to eyeglass lenses, and that are decorated with greater freedom and richer expression.

[0008] In an eyeglass lens, by locally removing at least a portion of the thin film that constitutes the laminated structure of an optical interference layer formed on the surface of the lens, the reflection characteristics of light generated in the removed portion can be changed compared to the non-removed portion.

[0009] In this removal, removed portions A, where at least one layer of the optical interference layer is locally removed, are arranged regularly (preferably repeatedly), while non-removed portions B, where the layer is not removed, are present between the removed portions. The inventors have found that this makes it possible to achieve a color tone γ that is different from the color tone α of a region consisting only of removed portions A, where the optical interference layer is locally removed, and the color tone β of a region consisting only of non-removed portions B, where the optical interference layer remains intact.

[0010] FIG. 11 is a schematic cross-sectional view of a spectacle lens, showing how a viewer visually recognizes the color tone γ, not the color tone α or the color tone β, when looking at the spectacle lens in a worn state.

[0011] 11 , when removed portions A and non-removed portions B are adjacent to each other and regularly alternately arranged, reflected light A' from removed portions A and reflected light B' from non-removed portions B enter the viewer's pupil as a blended whole. As a result, the viewer perceives a color tone γ that is a mixture (e.g., light blue) of the color of light A' reflected from removed portions A (e.g., a metallic color close to gold, color tone α) and the color of light B' reflected from non-removed portions B (e.g., blue, color tone β). Based on this finding, the following solution to the above-mentioned problem has been found.

[0012] A first aspect is a spectacle lens having an object-side surface and an eyeball-side surface, comprising: a lens substrate; and an optical interference layer having a laminated structure provided on at least one of the surfaces of the lens substrate; wherein at least one of the surfaces of the spectacle lens on which the optical interference layer is provided has: first regions in which removed portions, where at least one layer of the optical interference layer has been locally removed, are arranged with a first regularity, and non-removed portions, where the layer has not been removed, are present between the removed portions; and second regions in which the removed portions are arranged with a second regularity or are regions consisting of the non-removed portions; and wherein the first and second regions are visually recognized as regions of different color tones.

[0013] A second aspect is the eyeglass lens according to the first aspect, wherein the color tone includes at least one of brightness and darkness of color, light and dark of color, brightness and darkness due to differences in the amount of reflected light, and brightness and darkness of brilliance that occur in the region.

[0014] A third aspect is the eyeglass lens according to any one of the first and second aspects, wherein the color tone is uniform within the first region, and the color tone is uniform within the second region.

[0015] A fourth aspect is the eyeglass lens according to any one of the first to third aspects, wherein the optical interference layer having a laminated structure is an anti-reflection film having a multilayer structure in which a low refractive index layer and a high refractive index layer are laminated, and the removed portion is formed by partially removing the low refractive index layer, which is the outermost layer of the multilayer structure.

[0016] A fifth aspect is the eyeglass lens according to any one of the first to fourth aspects, which has the first region and a second region in which the removed portions are arranged with a second regularity, and in which the arrangement of the removed portions differs between the first region and the second region.

[0017] A sixth aspect is the spectacle lens according to any one of the first to fifth aspects, in which the first regularity is an aspect in which the removed portions are repeatedly arranged in at least one direction.

[0018] A seventh aspect is the eyeglass lens according to any one of the first to sixth aspects, wherein, in a plan view of the eyeglass lens, the smallest unit of repetition of the removed portion in the first region is one dot-shaped removed portion, and the value of (minimum width + maximum width) / 2 in each of the dot-shaped removed portions varies by no more than 20% within the first region for 80% or more of the dots in the first region.

[0019] An eighth aspect is the eyeglass lens according to any one of the first to seventh aspects, wherein, in a plan view of the eyeglass lens, the smallest unit of repetition of the removed portions in the first region is a plurality of dot-shaped removed portions that are connected to each other.

[0020] A ninth aspect is the eyeglass lens according to any one of the first to eighth aspects, wherein the non-removed portions of the first region surround each of the removed portions, or are surrounded by the removed portions, or a combination thereof.

[0021] A tenth aspect is the eyeglass lens according to any one of the first to ninth aspects, wherein, in a plan view of the eyeglass lens, when the X direction and the Y direction are mutually perpendicular directions and an XY lattice is defined as a combination of straight lines arranged at equal intervals in the X direction and straight lines arranged at equal intervals in the Y direction, a common XY lattice is adopted for the first region and the second region, and each of the removed portions in the first region and each of the removed portions in the second region includes only one intersection of the XY lattice.

[0022] An eleventh aspect is the eyeglass lens according to any one of the first to tenth aspects, wherein, in a planar view of the eyeglass lens, the removed portions in the first region are formed by thinning out the removed portions in accordance with a first thinning regularity from a virtual state in which removed portions are formed at all of the intersections of the XY lattice, and the removed portions in the second region are formed by thinning out the removed portions in accordance with a second thinning regularity that is different from the first thinning regularity from a virtual state in which removed portions are formed at all of the intersections of the XY lattice.

[0023] A twelfth aspect is the eyeglass lens according to any one of the first to eleventh aspects, wherein the first regularity includes a regularity of the center-to-center distance between the removed portions in one direction G in the first region, and the second regularity includes a regularity of the center-to-center distance between the removed portions in one direction G in the second region.

[0024] A thirteenth aspect is the eyeglass lens according to any one of the first to twelfth aspects, wherein, in a plan view of the eyeglass lens, the center-to-center distance between adjacent removed portions in one direction H in the first region is T times the center-to-center distance between adjacent removed portions in the same direction H in the second region, and 0.9*m / n≦T≦1.1*m / n (where m and n are natural numbers).

[0025] A fourteenth aspect is the spectacle lens according to any one of the first to thirteenth aspects, wherein the second region is made up of only the removed portion.

[0026] A fifteenth aspect is the spectacle lens according to any one of the first to fourteenth aspects, wherein the luminous transmittance of the first region and the second region is both 80% or more.

[0027] A sixteenth aspect is the spectacle lens according to any one of the first to fifteenth aspects, wherein the maximum width of the removed portion is 200 μm or less.

[0028] A seventeenth aspect is a pair of eyeglasses comprising an eyeglass frame and an edge-shaped eyeglass lens having an object-side surface and an eyeball-side surface, wherein the eyeglass lens is the eyeglass lens according to any one of the first to sixteenth aspects.

[0029] An eighteenth aspect is a method for manufacturing a spectacle lens having an object-side surface and an eyeball-side surface, the method comprising: forming, on at least one of the surfaces of the spectacle lens having a lens substrate and an optical interference layer having a laminated structure provided on at least one of the surfaces of the lens substrate, first regions in which removed portions, where at least one layer of the optical interference layer has been locally removed by laser irradiation, are arranged with a first regularity, and where non-removed portions, where the layer has not been removed, are present between the removed portions; and second regions in which the removed portions are arranged with a second regularity by laser irradiation or are regions consisting of the non-removed portions, and the first regions and the second regions are visually recognized as regions of different color tones.

[0030] A nineteenth aspect is the method for manufacturing eyeglass lenses according to the eighteenth aspect, comprising: a step of creating, from image data of a desired decorative design, drawing data including planned laser irradiation locations on a surface on which the optical interference layer is provided; and a laser irradiation step of using the drawing data to irradiate the optical interference layer with a laser while scanning a laser beam with a laser irradiation device, thereby forming the removed portion, wherein the optical interference layer having a laminated structure is an anti-reflection film with a multilayer structure in which a low refractive index layer and a high refractive index layer are laminated, and the removed portion is formed by partially removing the low refractive index layer, which is the outermost layer of the multilayer structure.

[0031] A twentieth aspect is a method for manufacturing a spectacle lens according to any one of the eighteenth to nineteenth aspects, which comprises forming the first region and a second region in which the removed portions are arranged with a second regularity by laser irradiation, and making the arrangement of the removed portions in the first region and the second region different from each other.

[0032] A twenty-first aspect is the method for manufacturing eyeglass lenses according to any one of the eighteenth to twentieth aspects, wherein when the X and Y directions are perpendicular to each other, and an XY lattice is formed by a combination of straight lines arranged at equal intervals s in the X direction and straight lines arranged at equal intervals t in the Y direction, the drawing data is data including at least X and Y coordinates, and based on the relationship between the total amount of laser irradiation and the degree of damage to layers below the high refractive index layer, a minimum center-to-center distance x0 between centers of laser irradiation, which indicates the degree of overlap of laser irradiation points in the X direction, is set so as to suppress the occurrence of the damage, and the minimum center-to-center distance x0 is set to the equal intervals s, a minimum center-to-center distance y0 between centers of laser irradiation, which indicates the degree of overlap of laser irradiation points in the Y direction, is set so as to suppress the occurrence of the damage, and the minimum center-to-center distance y0 is set to the equal intervals t, a common XY lattice is adopted for the first region and the second region, and each of the laser irradiation points in the first region and each of the laser irradiation points in the second region is set so as to include only one intersection of the XY lattice.

[0033] A 22nd aspect is a method for manufacturing a spectacle lens according to any one of the 18th to 21st aspects, in which the number of intersections of the XY lattice to be arranged within a portion of the drawing data corresponding to one pixel of the image data is set based on the relationship of the degree of damage to the layers below the high refractive index layer to the total amount of light emitted by the laser, and the size of one side of one pixel of the image data.

[0034] A 23rd aspect is the method for manufacturing eyeglass lenses according to any one of aspects 18 to 22, wherein the laser irradiation points in the first region are arranged in a manner in which the irradiation points are thinned out in accordance with a first thinning regularity from a virtual state in which the laser is irradiated to all of the intersections of the XY lattice, and the laser irradiation points in the second region are arranged in a manner in which the irradiation points are thinned out in accordance with a second thinning regularity that is different from the first thinning regularity from a virtual state in which the laser is irradiated to all of the intersections of the XY lattice.

[0035] A twenty-fourth aspect is the method for manufacturing a spectacle lens according to any one of the eighteenth to twenty-third aspects, wherein the fluctuation range of the value of (minimum width+maximum width) / 2 at each of the laser irradiated points in the first region and the second region is within 20%.

[0036] A twenty-fifth aspect is the method of manufacturing a spectacle lens according to any one of the eighteenth to twenty-fourth aspects, wherein the drawing data corresponds one processing spot by laser irradiation to one pixel of the image data.

[0037] A twenty-sixth aspect is the method for manufacturing a spectacle lens according to any one of the eighteenth to twenty-fifth aspects, wherein the drawing data corresponds a plurality of processing spots by laser irradiation to one pixel of the image data.

[0038] A 27th aspect is the method for manufacturing a spectacle lens according to any one of the 18th to 26th aspects, wherein the drawing data corresponds to one pixel of the image data with a plurality of processing spots formed by laser irradiation, with the processing spots partially overlapping each other.

[0039] A twenty-eighth aspect is the method for manufacturing a spectacle lens according to any one of the eighteenth to twenty-seventh aspects, wherein the laser is an ultrashort pulse laser having a pulse width of 10 femtoseconds or more and less than 100 picoseconds.

[0040] A 29th aspect is an optical element comprising: a substrate; and an optical interference layer having a laminated structure provided on the surface of the substrate; wherein the surface of the optical element on which the optical interference layer is provided comprises: first regions in which removed portions, where at least one layer of the optical interference layer has been locally removed, are arranged with a first regularity, and non-removed portions, where the layer has not been removed, are present between the removed portions; and second regions in which the removed portions are arranged with a second regularity or are regions consisting of the non-removed portions; and wherein the first region and the second region are visually recognized as regions of different color tones.

[0041] Another embodiment of the present disclosure relates to a spectacle lens having an object-side surface and an eyeball-side surface, the spectacle lens comprising: a lens substrate; and an optical interference layer having a laminated structure on either surface of the lens substrate; at least one layer of the optical interference layer having a visible decorative portion formed by locally removing the layer; the decorative portion having a plurality of regions of the removed optical interference layer having mutually different removal area ratios in a planar view; the plurality of regions including a first region having a removal pattern in which the removal portions are arranged with a first regularity, with the minimum unit being a removal portion of 200 μm or less; and the plurality of regions being visually recognized as regions having mutually different color tones.

[0042] In the above embodiment, the color tone preferably includes brightness and darkness of color, color shading, brightness and darkness due to differences in the amount of reflected light, or brightness and brightness occurring in an area.

[0043] In the above embodiment, the removed portion preferably has a reflectance in the visible light region that is different from that of the non-removed portion of the optical interference layer.

[0044] In the above embodiment, the plurality of regions preferably includes a second region different from the first region, and the removal area ratio in the second region is 100%.

[0045] In the above embodiment, the luminous transmittance of the decorative portion is preferably 80% or more.

[0046] In the above embodiment, the removed optical interference layer preferably includes a low refractive index layer formed on the top layer of the laminate structure.

[0047] One embodiment of the present disclosure relates to eyeglasses comprising an eyeglass frame and a shaped eyeglass lens having an object-side surface and an eyeball-side surface, wherein the eyeglass lens is the eyeglass lens of the above embodiment.

[0048] One embodiment of the present disclosure relates to a method for manufacturing an eyeglass lens, including processing an eyeglass lens having a lens substrate and an optical interference layer having a laminated structure formed on the lens substrate to form a decorative portion, the method comprising: a step of creating drawing data based on image data of a desired decorative design; and a laser irradiation step of using the drawing data to irradiate the optical interference layer with a laser while scanning a laser beam with a laser irradiation device, thereby forming the decorative portion, wherein the laser irradiation step locally removes at least one layer of the optical interference layer, thereby forming a plurality of regions of the removed optical interference layer having different removal area rates in a planar view, the plurality of regions including a first region having a removal pattern in which removal portions having a minimum dimension of 200 μm or less are arranged with a first regularity, and the plurality of regions are visually recognized as regions having different color tones from one another.

[0049] In the above embodiment, the step of creating the drawing data preferably includes determining a correspondence relationship between the pixel size of the image data and the processing spot size produced by irradiation with one pulse of the pulsed laser.

[0050] In the above embodiment, the image data is preferably binary data, and the drawing data includes a removal pattern whose minimum unit is the pixel size of the image data, with the pixel size being within the range of 1 to 100 μm.

[0051] In the above embodiment, preferably, in the drawing data, the pitches in the X direction and the Y direction of each of the processing spots formed by irradiation with one pulse of the pulsed laser are both in the range of 1 to 100 μm.

[0052] In the above embodiment, the plurality of regions preferably includes a second region in which the removed portions are arranged without any gaps, resulting in a removed area ratio of 100%.

[0053] In the above embodiment, the drawing data may be such that one pixel of the image data corresponds to one processing spot by laser irradiation.

[0054] In the above embodiment, the drawing data may correspond to one pixel of the image data and a plurality of processing spots formed by laser irradiation.

[0055] In the above embodiment, the drawing data may correspond to one pixel of the image data with a plurality of processing spots formed by laser irradiation, with the spots partially overlapping each other.

[0056] In the above embodiment, the laser beam is preferably an ultrashort pulse laser having a pulse width of 10 femtoseconds or more and less than 100 picoseconds.

[0057] In the above embodiment, the optical interference layer preferably includes a reactive layer that is relatively more reactive to irradiation with a laser beam than other layers included in the laminate structure, and the reactive layer is at least partially removed by irradiation.

[0058] Another embodiment of the present disclosure relates to an optical element comprising: a substrate; and an optical interference layer having a laminated structure formed on a surface of the substrate; wherein at least one layer of the optical interference layer has a visible decorative portion formed by locally removing the layer; the decorative portion has a plurality of regions of the removed optical interference layer having different removal area ratios in a planar view; the plurality of regions includes a first region having a removal pattern in which the removal portions are arranged with a first regularity, with the minimum unit being a removal portion having a dimension of 200 μm or less; and the plurality of regions are visually recognized as regions having different color tones from each other.

[0059] The technical concept of the present invention is also reflected in eyeglasses in which the vicinity of the periphery of the eyeglass lens is cut based on a predetermined frame shape and the eyeglasses are fitted into the eyeglass frame.

[0060] The embodiments described above can be combined with each other in any way.

[0061] According to an embodiment of the present disclosure, it is possible to provide a spectacle lens, glasses, a spectacle lens manufacturing method, and the like, which have a high degree of freedom in decorating a spectacle lens with a desired design, in a spectacle lens in which a localized partial removal of an optical interference layer is adopted.

[0062] FIG. 1 is a schematic front view of a spectacle lens according to the present embodiment. FIG. 2 is a schematic front view of another aspect of the spectacle lens according to the present embodiment. FIG. 3 is a schematic diagram of a removal pattern of an area formed by dots on the spectacle lens according to the present embodiment. FIG. 4 is a removal pattern sample of an area formed by dots on the spectacle lens according to the present embodiment. FIG. 5 is a schematic cross-sectional view of a spectacle lens according to the present embodiment. FIG. 6 is a schematic front view of a spectacle lens according to the present embodiment. FIG. 7 is a schematic cross-sectional view of a spectacle lens according to the present embodiment. FIG. 8 is a flow chart showing an example of the procedure of a method for manufacturing a spectacle lens according to the present embodiment. FIG. 9 is a flow chart showing an example of the procedure of a method for manufacturing a spectacle lens according to the present embodiment. FIG. 10 is an explanatory diagram showing an example of the schematic configuration of a laser processing device used in the method for manufacturing a spectacle lens according to the present embodiment. FIG. 11 is a schematic cross-sectional view of a spectacle lens according to the embodiment, showing how a viewer visually recognizes a color tone γ, not a color tone α or a color tone β, when looking at the spectacle lens when worn. FIG. 12 is a schematic diagram of a spectacle lens according to an embodiment, when viewed from above, showing removal areas arranged with various regularities. The dashed lines indicate area units, and the XY grid is a virtual line. The white arrows indicate that the removal areas are arranged with varying regularity from the area at the base of the white arrow to the area at the tip of the arrow. This figure shows an example in which all areas are formed on the surface, and each removal area includes only one intersection of the XY grid. FIG. 13 is an explanatory diagram showing the correspondence between one pixel of image data and a processing spot produced by laser irradiation in a spectacle lens according to an embodiment. (a) is a diagram showing how 3x3 removal areas (the center-to-center distance between adjacent removal areas is x0' in both the X and Y directions) are connected together to form one pixel in an XY grid. (b) is a diagram showing how 2x2 removal areas (the center-to-center distance between adjacent removal areas is x0' in both the X and Y directions) are connected together to form one pixel in an XY grid. (c) is a diagram showing how 2x1 removed portions (the center-to-center distance between adjacent removed portions is x0" which is smaller than x0') are connected in an XY lattice and set as one pixel. (d) is a diagram showing how one removed portion is set as one pixel. Figure 14 is a plot of the average reflectance in Test Examples 1 to 3.

[0063] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings as necessary, but the present disclosure is not limited thereto and various modifications are possible without departing from the spirit thereof. In the drawings, the same elements are denoted by the same reference numerals, and redundant explanations will be omitted. Furthermore, positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings unless otherwise specified. Furthermore, the dimensional ratios of the drawings are not limited to those shown.

[0064] In this specification, for example, a numerical range such as "1 to 100" includes both the lower limit "1" and the upper limit "100." The same applies to other numerical ranges.

[0065] In this specification, the term "lens" includes spectacle lenses. A "spectacle lens" is a transparent body that has an object-side surface and an eyeball-side surface and a predetermined power (spherical power, astigmatism power, etc.) based on the prescription of the wearer (spectacles user). It usually has a spherical, aspherical, or progressive surface shape. In addition to eyeglasses intended to correct the user's refractive error, lenses with polarization, photochromic, and wavelength filter functions that cut off specific wavelengths are also included in this specification. In this specification, the term "lens" refers to uncut lenses before edging, or lenses after edging (processed lenses).

[0066] In this specification, the side of the optical center of the eyeglass lens is referred to as the inside, and the side of the outermost edge of the eyeglass lens is referred to as the outside. In this specification, an example is given in which the optical center coincides with the geometric center and the centering center. Hereinafter, the optical center will also be referred to as the lens center.

[0067] When the spectacle lens is placed on a stand, the surface facing the object or the surface facing the eye faces up. Therefore, when discussing the configuration of each surface of the spectacle lens, we will assume a planar view.

[0068] In this specification, the left-right direction when the eyeglass lens is placed on the stand is defined as the X direction, the up-down direction as the Y direction, and the thickness direction of the eyeglass lens, which is perpendicular to the X and Y directions, as the Z direction. The Z direction is also the optical axis direction of the eyeglass lens. The lens origin, which is the origin of the eyeglass lens, is defined as the lens center.

[0069] When viewed from the wearer (i.e., from the viewer's perspective), the right is the +X direction, the left is the -X direction, the up is the +Y direction, the down is the -Y direction, the direction toward the object side is the +Z direction, and the opposite direction (the direction toward the back) is the -Z direction. The near direction and the back direction relate to the light beam passing through the center of the pupil, and although in the case of peripheral vision, strictly speaking, XY coordinates must also be taken into consideration, in this specification they are defined as above for the sake of convenience. In this specification, "planar view" refers to the state when viewed from the +Z direction to the -Z direction.

[0070] [Eyeglass Lens] One aspect of the present embodiment relates to an eyeglass lens having an object-side surface and an eyeball-side surface, comprising: a lens substrate; and an optical interference layer having a laminated structure provided on at least one of the surfaces of the lens substrate, wherein at least one of the surfaces of the eyeglass lens on which the optical interference layer is provided has: first regions in which removed portions, where at least one layer of the optical interference layer has been locally removed, are arranged with a first regularity, and non-removed portions, where the layer has not been removed, are present between the removed portions; and second regions in which the removed portions are arranged with a second regularity or are regions consisting of the non-removed portions, wherein the first regions and the second regions are visually recognized as regions of different color tones.

[0071] According to an embodiment of the present disclosure, it is possible to provide a spectacle lens, glasses, a spectacle lens manufacturing method, and the like, which have a high degree of freedom in decorating a spectacle lens with a desired design, in a spectacle lens in which a localized partial removal of an optical interference layer is adopted.

[0072] <Overview of the configuration of eyeglass lenses> Fig. 1 is a schematic front view of an eyeglass lens according to this embodiment. Fig. 2 is a schematic front view of an eyeglass lens according to another embodiment. The eyeglass lens 1 according to this embodiment has a decorative portion that includes multiple regions as described above and is visible at least from the object-side surface. In Fig. 1, the decorative portion includes decorative portion X1 and decorative portion X2, and in Fig. 2, the decorative portion includes decorative portion X3.

[0073] The "decorative portion" in this specification refers to a portion including a removed portion in which at least one layer of the optical interference layer is locally removed, and corresponds to at least the first region. When the second region is a region in which the removed portions are arranged with a second regularity, the second region also corresponds to the decorative portion.

[0074] The spectacle lens according to this embodiment has an object-side surface and an eyeball-side surface. The "object-side surface" refers to the surface that faces the object when a wearer wears eyeglasses equipped with the spectacle lens. The "eyeball-side surface" refers to the opposite, i.e., the surface that faces the eye when a wearer wears eyeglasses equipped with the spectacle lens. The object-side surface is generally convex and the eyeball-side surface is generally concave, meaning that the spectacle lens is generally a meniscus lens. This applies to both uncut lenses before edging and spectacle lenses (processed lenses) after edging, in which the periphery is cut to fit the shape of the eyeglass frame. The contents of this paragraph also apply to the lens substrate (the lens body before the formation of a hard coating or anti-reflection coating) that forms the basis of the spectacle lens. In other words, the lens substrate also has an object-side surface and an eyeball-side surface.

[0075] The optical interference layer having a laminated structure may be a known one. A specific example will be described later. The optical interference layer may be provided on the surface of the spectacle lens where the removed portion is to be provided, but it may also be provided on both surfaces of the spectacle lens.

[0076] The decorative portion may be formed on either side of the spectacle lens. It is visible from the object-side surface, but preferably also from the eyeball-side surface. Here, "visible" means that light (sunlight, illumination, etc.) incident on the decorative portion is reflected by the decorative portion and can be seen by a third party (a person other than the wearer) when it enters their pupil. To be highly visible, the decorative portion preferably has a predetermined high reflectivity and a smooth surface like a mirror that can specularly reflect incident light. This point will be discussed further below. This specification illustrates a case in which an optical interference layer is provided on both sides of a spectacle lens, but a removed portion is provided only on the eyeball-side surface.

[0077] In the above-mentioned removed portion, "at least one layer" refers to any single layer or multiple layers of the laminated structure. The state in which at least one layer is removed refers to the removal of one or multiple layers on the surface side of the laminated structure. Furthermore, "local" refers to a partial area on the lens surface.

[0078] Furthermore, the eyeglass lens 1 according to this embodiment has a removed portion A where at least one layer of the laminate structure of the optical interference layer has been removed, and a non-removed portion B that does not correspond to the removed portion A. As shown in the enlarged views of the decorative portions X1 and X2 at the bottom of Fig. 1 , the region x1 corresponding to the decorative portion X1 and the region x2 corresponding to the decorative portion X2 each have a removed portion A where at least one layer of the laminate structure of the optical interference layer has been removed, and a non-removed portion B where that layer has not been removed. Furthermore, as shown in the enlarged view of the decorative portion X3 at the bottom of Fig. 2 , the regions x31, x32, and x33 that make up the decorative portion X3 each have a removed portion A where at least one layer of the laminate structure of the optical interference layer has been removed, and a non-removed portion B where that layer has not been removed.

[0079] Because at least one layer of the laminated structure of the optical interference layer has been removed in the removed portion A compared to the non-removed portion B, the optical properties of the removed portion A and the non-removed portion B are different from each other. This difference in optical properties between the removed portion A and the non-removed portion B results in a difference in how the spectacle lens appears when viewed by a third party from the object-side surface when worn in the removed portion A and the non-removed portion B. In the spectacle lens 1 according to this embodiment, a decorative portion is formed by utilizing the difference in how the removed portion A and the non-removed portion B appear when viewed by a third party. In other words, a decorative portion with desired letters, symbols, designs, etc. is formed on the surface of the spectacle lens by forming a removed portion A on a spectacle lens having an optical interference layer with a laminated structure in which low-refractive-index layers and high-refractive-index layers are laminated, where at least a portion of the low-refractive-index layer or the high-refractive-index layer of the optical interference layer is absent.

[0080] At least one of the surfaces of the spectacle lens on which the optical interference layer is provided (e.g., the surface facing the eyeball, hereinafter the same) has a first region and a second region. The first region and the second region are collectively referred to as "multiple regions." The multiple regions may also include a third region, a fourth region, a fifth region, etc., which are equivalent to the first region or the second region and will be described later as modified examples.

[0081] The first region is a region in which removed portions, in which at least one layer of the optical interference layer has been locally removed, are arranged with a first regularity, and non-removed portions, in which the layer has not been removed, exist between the removed portions.

[0082] As used herein, "regularity" refers to the arrangement of removed portions in at least one predetermined direction (e.g., the X direction and / or the Y direction) in accordance with a certain rule, as shown in FIGS. 1 to 4 and 12. An example of this rule is the repeated arrangement of removed portions at a certain cycle in the one direction. For example, in the XY lattice of FIG. 12, when viewed in the X direction, the intersections of the XY lattice are labeled 1, 2, 3, and 4. An example rule is that a removed portion is arranged at intersection 1, no removed portion is arranged at intersection 2, no removed portion is arranged at intersection 3, and no removed portion is arranged at intersection 4. Of course, the rule may also be that a removed portion is arranged at intersection 1, a removed portion is arranged at intersection 2, no removed portion is arranged at intersection 3, and no removed portion is arranged at intersection 4.

[0083] It should be noted that this "repetition" is used in a broad sense, and may include, for example, a case where the distances between the centers of adjacent removed portions do not strictly match but the removed portions are arranged in the same pattern in one direction with non-removed portions present between them.

[0084] In this specification, the "removed portion" is also referred to as a "dot" and, when irradiated with a laser, as a "spot." It refers to a portion having the same shape as one processed spot per pulse. Overlapping removed portions in a plan view are also referred to as a connected body.

[0085] The "center-to-center distance of removed portions" refers to the distance between the centers of gravity of adjacent removed portions (dots, spots) in a planar view. This center-to-center distance is also referred to as the "pitch" in this specification. When the shape of the removed portions in a planar view is a perfect circle or ellipse, the "center-to-center distance of removed portions" refers to the center-to-center distance, as the name suggests.

[0086] The first regularity preferably includes a rule regarding the center-to-center distance between the removed portions in one direction G in the first region. The second regularity preferably includes a rule regarding the center-to-center distance between the removed portions in one direction G in the second region. Preferably, the two rules are different from each other. On the other hand, as described above, it is possible that the center-to-center distances of adjacent removed portions do not strictly match, but are arranged in a similar pattern in one direction, and instead are arranged in a different pattern in another direction. For example, in Figure 12 below, regions (2) and (3) have similar patterns in the X direction but different patterns in the Y direction. Therefore, this embodiment is not limited to the first and second regularities being different from each other in a specific direction. In any case, regardless of the rule regarding the center-to-center distance, if the first regularity and the second regularity are different in some way, the first and second regions will be visually perceived as regions of different color tones.

[0087] There are two main cases where "non-removed portions exist between the removed portions." One is a case where removed portion A surrounds non-removed portion B, as in region x1 in Figure 1. In this case, when region x1 is recognized as a sea-island structure, non-removed portion B becomes an island, and removed portion A becomes a sea. The other is a case where non-removed portion B surrounds removed portion A, as in region x2 in Figure 1. In this case, when region x1 is recognized as a sea-island structure, removed portion A becomes an island, and non-removed portion B becomes a sea. Both cases are collectively referred to as "non-removed portions exist between the removed portions" in this specification.

[0088] The second region is either one of the following: (1) a region in which the removed portions are arranged with a second regularity; or (2) a region consisting of non-removed portions.

[0089] (1) means that the second region has removed portions. In this case, the second regularity is not limited as long as it is different from the first regularity in one respect (for example, the center-to-center distance, the arrangement pattern of the removed portions, etc.). Otherwise, the explanation of the first regularity above can be used. In this specification, the arrangement pattern of the removed portions is also referred to as a removed pattern, or simply as a pattern.

[0090] In (1), the non-removed portions are not limited to being present between the removed portions. That is, the second region may be entirely removed without leaving any non-removed portions. This entirely removed portion is also referred to as a "solid pattern" in this specification.

[0091] (2) means that the second region does not have a removed portion. In the case of (2), when a viewer views the eyeglass lens, they see the mixed color (e.g., light blue) tone γ described in [Means for Solving the Problems of the Invention] and the color of light resulting from reflected light B' from the non-removed portion B (e.g., blue, tone β in the case of a blue-cut lens). Even if the viewer does not see the color of light resulting from reflected light A' from the removed portion A (e.g., a metallic color close to gold, tone α), they can see the tones β and γ.

[0092] Prior to the filing of this application, it was not known that a color tone γ is exhibited in an eyeglass lens in which a localized partial removal of an optical interference layer is employed. Furthermore, even when considering the first region alone that produces the color tone γ, there is a high degree of freedom in changing the color tone γ by changing the regularity of the arrangement of the removed portions A. This freedom of change will be described later, but it is a significant freedom along with the freedom of decoration (decoration) referred to in this specification.

[0093] Therefore, even in the case of (2), the effect of the present invention remains the same: that spectacle lenses employing localized partial removal of the optical interference layer can provide greater color variation than conventional lenses. The same can be said for the solid pattern case of (1) above, where spectacle lenses employing localized partial removal of the optical interference layer can provide greater color variation than conventional lenses. In light of the content of this paragraph, the technical concept of the present invention is also reflected in spectacle lenses that define only the first region. Therefore, the spectacle lens and its related technology can also be considered an invention.

[0094] By employing the above configuration, the first area and the second area are visually recognized as areas having different color tones.

[0095] In this specification, "color tone" primarily refers to the appearance of a color, including the brightness and darkness of the color, the brightness and darkness due to the intensity (difference) of the amount of reflected light, or the intensity of brilliance. A difference in color tone refers to the perception of any of these different appearances by a viewer with normal visual acuity. Furthermore, a change in color tone here also includes a change in the hue due to differences in the removal area ratio. A change in color tone includes a change in appearance due to changes in lightness, hue, and saturation expressed in the L*a*b* color space. For information on the L*a*b* color space, please refer to pages 50-52 of the Official Textbook for the Color Certification Examination, Level 1, sponsored by the Ministry of Education, Culture, Sports, Science and Technology (First Edition, Third Printing, February 14, 2022), published by the Color Certification Association, a public interest incorporated association certified by the Cabinet Office.

[0096] In this specification, "how a third party (observer) sees the spectacle lens when worn from the object-side surface" includes how a third party sees when the third party receives reflected light from the spectacle lens when worn. Specifically, it refers to how a light source (sunlight, illumination, etc.) in the wearer's environment sees when it is incident on the decorative part of the spectacle lens when worn, and the reflected light is specularly reflected and can be seen at a relative position where it can be incident on the third party's eyes.

[0097] <Color Tone Variations> This embodiment can further increase the color tone variations. For example, by utilizing the high degree of freedom in changing the color tone γ as described above, the regularity of the arrangement of the removed portions A may be changed to change the mixed color from, for example, light blue.

[0098] The arrangement of the removed portions A may be regular in both the X and Y directions, or may have different regularities in both directions (see, for example, FIG. 12).

[0099] 12 is a schematic diagram of a spectacle lens according to an embodiment, viewed from above, showing removal portions arranged with various regularities, with dashed lines indicating area units and XY lattices being virtual lines. The XY lattices will be described later. The white arrows indicate that the removal portions are arranged with varying regularity from the area at the base of the white arrow to the area at the tip of the arrow. This figure shows an example in which both areas are formed on the surface, a common XY lattice is used for the first and second areas, and each removal portion includes only one intersection of the XY lattice.

[0100] Thus, regularity is an important element in the technical concept of the present invention. That is, the arrangement pattern of the multiple removed portions follows a predetermined rule (regardless of whether the pitch is constant or non-constant), and the color tone of the region can be controlled depending on that rule. One specific example of that rule is an XY grid, as shown in FIG. 12.

[0101] As described above, it is possible to form areas that can produce various color tones on one surface of the eyeglass lens, as shown in Fig. 12. The decorative portion may be provided on both surfaces of the eyeglass lens.

[0102] 12, the region consisting of the non-removed portion (region outside the dashed line) may also be added to the variation of color tone. The second region may also include the region consisting of the non-removed portion.

[0103] <Specific Example and Modification of Spectacle Lens Configuration> In the spectacle lens 1, the decorative portion includes a plurality of regions in which, in a plan view of the optical interference layer, removal patterns formed by the removal portions A are different from one another. These plurality of regions correspond to the regions x1 and x2 in Fig. 1 and to the regions x31, x32, and x33 in Fig. 2. In each of the plurality of regions, a removal portion A is formed that forms an arbitrary removal pattern in a plan view of the optical interference layer.

[0104] In both FIG. 1 and FIG. 2, the color tone of each area (x1, x2, x31, x32, x33) is uniform.

[0105] In this specification, the removal pattern formed by the removed portion A is a pattern formed within the plane of the optical interference layer.

[0106] The pattern formed by the removed portions A can be different in each of the multiple regions. That is, the multiple regions can include a first region in which the removed portions A are formed in a pattern arranged with a first regularity, and another region in which the removed portions A are formed in a pattern arranged with a different regularity from the first regularity. In the other region, the removed portions A may be formed in a pattern arranged with a different regularity from the first regularity. The multiple regions may be in contact with each other as shown in FIG. 2 or may be separated by a considerable distance as shown in FIG. 1. When the regions are in contact with each other, the boundaries at which the pattern changes correspond to the boundaries of the regions.

[0107] There are no limitations on the manner in which the regions contact each other, and for example, the first region may be surrounded by the second region, or there may be multiple surrounded second regions. Conversely, the second region may be surrounded by the first region, or there may be multiple surrounded first regions. This relationship can also be applied to the following third, fourth, fifth, etc. regions that are equivalent to the first or second region.

[0108] A third region, a fourth region, a fifth region, etc., which are regions equivalent to the first region or the second region, may be provided. In the third region, the removed portions are arranged with a third regularity, in the fourth region, the removed portions are arranged with a fourth regularity, and in the third region, the removed portions are arranged with a fifth regularity. The first to fifth regularities are different from one another. The eyeglass lens according to this embodiment preferably includes the third region in addition to the first and second regions, preferably further includes the fourth region, and preferably further includes the fifth region.

[0109] The removal pattern formed by the removal unit A is arranged with a predetermined regularity. This pattern may be composed of units having a predetermined shape, or may be formed by regularly arranging units having a predetermined shape. An example of this predetermined shape is a dot (point) shape. The shape of the dot is not particularly limited, and its specific shape may be a circle, ellipse, triangle, square, pentagon, hexagon, or other polygon, or any other shape. For convenience of explanation, this specification will exemplify a case in which the dot shape, i.e., the laser processing shape (spot), is circular.

[0110] <Removed Area Ratio and Others> Hereinafter, this embodiment will be described focusing on the removed area ratio, which is the ratio of the area occupied by the removed portion in one region. Note that the content described in this section can naturally be combined with other descriptions in this specification.

[0111] The size of one region is defined to obtain the removal area ratio. Take region x33 in Figure 2 as an example. As shown in region x33, the size of one region may be the total area of ​​the removed portions (dots) at both ends in the X direction and the portion sandwiched between the dots where a predetermined pattern is repeatedly arranged. The size of one region may be the total area of ​​the removed portions (dots) at both ends in the Y direction and the portion sandwiched between the dots where a predetermined pattern is repeatedly arranged.

[0112] In region x31 in Figure 2, the repeating pattern ends partway when viewed in the +X direction (rightward). In this case, the part of the repeating pattern may be considered region x31 (for example, the boundary between region x31 and region x32 in Figure 2). Conversely, if the repeating pattern does not appear even at the original pitch when viewed in one direction, the removed portion (dot) closest to the one direction may be considered the end (for example, the left end of region 31). The content described in this paragraph is also applicable in the Y direction.

[0113] One aspect of this embodiment relates to a spectacle lens having an object-side surface and an eyeball-side surface, comprising: a lens substrate; and an optical interference layer having a laminated structure on either surface of the lens substrate, wherein at least one layer of the optical interference layer has a visible decorative portion formed by locally removing the optical interference layer, wherein the decorative portion has a plurality of regions of the removed optical interference layer having mutually different removal area ratios in a planar view, wherein the plurality of regions include a first region having a removal pattern in which the removed portions are arranged with a first regularity, with the minimum unit being a removal portion of 200 μm or less, and wherein the plurality of regions are visually recognized as regions having mutually different color tones. This embodiment provides a spectacle lens with a high degree of freedom in decoration.

[0114] In the spectacle lens according to one aspect of the present embodiment, the decorative portion includes a plurality of regions, each of which has a removed portion in which at least one layer of the laminate structure of the optical interference layer has been removed, and at least one of the plurality of regions has a removed pattern (referred to as a first region) in which removed portions each having a size of 200 μm or less are arranged with a predetermined regularity (referred to as a first regularity) as a minimum unit.

[0115] In this specification, the "smallest unit of repetition of removed portions" (also referred to as the "smallest unit of removed portions" or simply the "smallest unit") refers to a single dot when the removed portions (dots) are not connected to each other (e.g., (d) in FIG. 13). One dot, i.e., one processing spot in one pulse, is also the smallest unit of processing and the smallest unit of drawing data. When the removed portions (dots) are connected to each other and the connected dots are repeatedly arranged in the X direction and / or Y direction with non-removed portions sandwiched between them (e.g., (a)-(c) in FIG. 13), the "smallest unit of removed portions" in this specification refers to the connected dots. This applies, for example, to a case where one pixel, the smallest unit of image data, is composed of multiple dots (details will be described later). In this case, for example, the connected dots are repeatedly arranged in the X direction and / or Y direction. Note that in the area enclosed by the dashed line in the lower right of FIG. 12 (shown below as (5)), two types of smallest units (one dot and a connected dot) exist, and regularity is achieved by combining the two types of smallest units. When all the removed portions (dots) in one area are connected to each other, the "smallest unit" refers to one dot.

[0116] In the first region, even if all the removed portions (dots) are connected to each other, there will be non-removed portions between the dots. On the other hand, in the second region, there may be no non-removed portions between the dots (so-called solid patterns). In all cases described in this paragraph, the minimum unit is one dot.

[0117] The minimum unit may be synonymous with the repeating unit in the regularity, or may not be synonymous with the repeating unit in the regularity, as shown in the area (5) enclosed by the dashed line in the lower right of Figure 12 below.

[0118] Furthermore, the plurality of regions includes a region (referred to as a second region) that is different from the first region, and the second region has a removal area ratio that is different from the removal area ratio of the first region. That is, the removal area ratio is different for each of the plurality of regions. As will be described in detail later, in this embodiment, the visibility of each region can be controlled by adjusting the removal area ratio for each region, and the regions can be perceived as different color tones. Furthermore, in at least one of the plurality of regions (e.g., the first region), the minimum unit of the removal portion is 200 μm or less, which is close to the resolution (resolution limit) of the human eye, and these removal portions are arranged in a predetermined regularity to form a removal pattern. This significantly increases the degree of freedom in decorating eyeglass lenses, allowing desired designs to be achieved.

[0119] Here, the inventor has discovered that in such removal, by adjusting the removal area ratio (hereinafter also referred to as "removal area ratio") in the region of the removed portion in a planar view of the optical interference layer, it is possible to express multiple regions that are distinguishable with the naked eye when viewed as a decorative portion including such removed portion, and to express color shades, light and dark, and gradational intermediate tones (hereinafter also referred to as intermediate color tones), or gradations.

[0120] In this embodiment, by adjusting the removal area ratio for each region, the visibility in each region can be controlled and different color tones can be recognized. Furthermore, by forming a removal pattern in at least one region (e.g., the first region) of the plurality of regions in which the minimum unit of removal is 200 μm or less, which is close to the resolution (resolution limit) of the human eye, and arranging these in a predetermined regularity, the degree of freedom in decorating the eyeglass lens is greatly improved, and desired designs can be applied.

[0121] In this specification, the phrase "the pattern of the removed portion A is configured with a minimum unit size of 200 μm or less" means that the shortest length of the representative lengths of the figures constituting the removed portion A is 200 μm or less. The representative length of a figure is a length used to define the dimensions of the figure, such as the diameter for a circle, the lengths of the major and minor axes for an ellipse, the length of the diagonal for a polygon, and the length and width of a line for a straight line. The minimum unit of the pattern of the removed portion A may correspond to the resolution of the image data and the minimum unit capable of processing the removed portion A in the eyeglass lens manufacturing method described below. For example, when the removed portion A is formed by laser processing, the minimum unit is preferably a substantially circular unit, and the laser spot diameter may correspond to the size of the minimum unit of the pattern of the removed portion A. The above phrase "the length of the shortest portion is 200 μm or less" is defined based on the following viewpoint. If either the X-direction or the Y-direction dimension is 200 μm or less, the removed portion is small enough to be close to the resolution limit of the human eye. If the length of the longest part is measured in millimeters, it may be possible to see the removed part as a single unit, but if the removed part is too thin, it will not be visible as a single unit. In either case, it is highly likely that the color of the removed part as a single unit cannot be distinguished. On the other hand, if many removed parts are arranged in a regular pattern, the color tone of the surface can be seen. Note that instead of "the length of the shortest part is 200 μm or less," the specification "the length (maximum width) of the longest part is 200 μm or less" may be adopted. This ensures that the removed part as a single unit is not reliably recognized by the human eye, while if many removed parts are arranged in a regular pattern, the color tone of the surface can be seen. The "200 μm or less" in this paragraph may further be "100 μm or less" or "70 μm or less."

[0122] In the eyeglass lens of this embodiment, the decorative portion may include a plurality of regions, each having a removal pattern formed by removed portions, and at least two regions having different color tones and being visually distinguishable may be formed by changing the removal area ratio in the removal pattern for each region. As will be described in detail later, by adjusting the removal area ratio for each region in this way, the visibility of each region is controlled, and by forming at least two regions having different color tones that are visually distinguishable, the degree of freedom in decoration of the eyeglass lens is improved.

[0123] When the removed portions are arranged with a second regularity in the second region, i.e., when the second region is not composed of only non-removed portions, it is preferable to make the arrangement of the removed portions different between the first region and the second region. "Arrangement" refers to the arrangement pattern of the centers of the removed portions when comparing the first region and the second region.

[0124] The pattern formed by the removed portions A can be formed into a stripe pattern, a lattice pattern, or a combination thereof by arranging the dot-shaped removed portions, and there is no limitation on the arrangement. It is sufficient that the removed portions A are arranged with some regularity.

[0125] For example, the plurality of regions may include a second region in which the removed portions A are arranged without gaps, resulting in a removed area ratio of 100%.

[0126] From the viewpoint of facilitating adjustment of the removal area ratio described below, it is preferable that the pattern of the removed portions A be composed of a plurality of dots and / or a plurality of straight lines. Incidentally, even in a pattern in which a predetermined area is entirely made up of removed portions A and no non-removed portions B exist, it can be said that the pattern is composed of a plurality of dots and / or a plurality of straight lines arranged without gaps. Even in this case, the pattern is obtained by arranging the minimum unit of removed portions A, each consisting of one pixel, with a predetermined regularity. Furthermore, the minimum unit can be determined from the intermediate tone pattern. The pattern of the removed portions A can be viewed by magnifying it using a microscope or the like.

[0127] For example, in the enlarged view shown at the bottom of Figure 1, in regions x1 and x2, the removed portion A is composed of circular dots as constituent units. The dot pitch is designed to be different in regions x1 and x2. In region x1, a pattern is formed in which each dot partially overlaps with its adjacent dot. In this specification, "adjacent" includes a state in which the removed portions are in contact with each other, where they partially overlap, and also includes a state in which the removed portions are not in contact with each other but are spaced apart from each other by a distance small enough to produce a color tone different from both the non-removed portion B and the solid pattern when arranged according to a predetermined regularity.

[0128] 2, the decorative portion X3 includes adjacent regions x31, x32, and x33, each having a different pattern of the removed portion A. The regions x31, x32, and x33 are designed to have different dot pitches. The region x33 has a pattern in which each dot partially overlaps with its neighboring dots.

[0129] As described above, the removed portion A and the non-removed portion B have different optical properties (e.g., reflectivity), which results in a difference in how the eyeglass lens looks when viewed by a third party from the object side while being worn. However, if decoration is performed simply by forming the removed portion A, a two-tone design is created, with a decorated area consisting only of the removed portion A and an undecorated area consisting only of the non-removed portion B.

[0130] On the other hand, in this embodiment, by setting the size of the removed portion A to a minimum unit of 200 μm or less and arranging the removed portions A of that size according to a predetermined regularity, it becomes possible to distinguish intermediate tone regions that have a color tone that differs from regions that are made up only of removed portions A and from regions that are made up only of non-removed portions B. This allows for greater freedom in decoration of eyeglass lenses in this embodiment.

[0131] The size of the smallest unit of the pattern of the removed portion A (a dot as a specific example) is, for example, preferably 3 μm or more and 180 μm or less, more preferably 5 μm or more and 150 μm or less, even more preferably 10 μm or more and 120 μm or less, even more preferably 15 μm or more and 100 μm or less, and particularly preferably 20 μm or more and 80 μm or less. Within the above range, the size of the smallest unit of the pattern of the removed portion A may be 60 μm or less, 50 μm or less, or 40 μm or less. By setting the size of the smallest unit within the above range, more natural halftones tend to be formed. Furthermore, the pattern of the removed portion A can be formed more easily, which tends to enable the provision of eyeglass lenses with high productivity. This minimum size can be determined by the pixel size in the image data.

[0132] Furthermore, the eyeglass lens according to this embodiment has a plurality of regions in which the area ratio (removed area ratio) occupied by the removed portions A in the pattern of the removed portions A differs from one another. In this way, by changing the area ratio occupied by the removed portions A in the pattern of the removed portions A for each region, it is possible to change the proportion of the removed portions A and the non-removed portions B present in each region. Therefore, by adjusting the removed area ratio, it is possible to control the appearance of each region. For example, by gradually increasing the removed area ratio from 0% to 100%, the decorative portion can be gradually transitioned from the appearance of a region consisting only of the non-removed portions B to the appearance of a region consisting only of the removed portions A. As a result, it is possible to increase the degree of freedom in decoration of the decorative portion.

[0133] In this specification, the removed area ratio is the area ratio of the total removed portions A in a plan view of the optical interference layer in a predetermined region. Ａ can be defined for each region having a certain pattern, and the area occupied by the removed portion A in each region is defined as S Ａ The area occupied by the non-removed portion B is S Ｂ When the removal area ratio P Ａ is defined as the ratio of the area occupied by the removed portion A to the total area of ​​each region. Ａ = S Ａ / (S Ａ +SＢ )

[0134] In each of the multiple regions constituting the decorative portion, the removal area ratio of the pattern of the removed portion A is not particularly limited and may be greater than 0% and less than 100%. Within this range, the removal area ratio may be, for example, 5% or more, 10% or more, 20% or more, 30% or more, 40% or more, 50% or more, 60% or more, 70% or more, or 80% or more, or 99% or less, 98% or less, 95% or less, 90% or less, 85% or less, 80% or less, 70% or less, 60% or less, or 50% or less. The removal area ratio may be within a range defined by any of the upper and lower limits described above, and may be, for example, 5% or more and less than 99%, 10% or more and less than 95%, or 20% or more and less than 90%.

[0135] The removal area ratios of the patterns of the removed portions A in each region may differ from one another, but the difference is not particularly limited. The difference in the removal area ratios between the regions is preferably 1% or more and 98% or less, more preferably 2% or more and 95% or less, even more preferably 3% or more and 90% or less, even more preferably 5% or more and 85% or less, and particularly preferably 10% or more and 80% or less. The difference in the removal area ratios between the regions may be 20% or more or 70% or less within the above range. Furthermore, the difference in the removal area ratios between the region with the highest removal area ratio and the region with the lowest removal area ratio among multiple regions is not particularly limited, but is preferably 10% or more and 99% or less, more preferably 15% or more and 95% or less, and even more preferably 20% or more and 90% or less. By setting the difference in the removal area ratios of the patterns of the removed portions A in each region within the above range, the difference in the appearance of each region can be more clearly defined.

[0136] Generally, the higher the removal area ratio, the higher the visibility of the decorative portion. Specifically, this is because the amount of reflected light generated in the removed portion A increases. The color tone of the reflected light tends to be brighter, darker, or more shining.

[0137] In each of the multiple regions constituting the decorative portion, the removal area ratio can be adjusted by appropriately designing the pattern of the removal portion A. FIG. 3 shows a schematic diagram of a pattern of the removal portion A formed by dots. In FIG. 3, (a) is an example of a pattern with a medium tone, and (b) is an example of a solid pattern. For example, when the pattern of the removal portion A is composed of dots, the removal area ratio can be adjusted by adjusting the dot density. In particular, when the dots are arranged regularly, the removal area ratio can be adjusted by adjusting the distance between the dots (the distance between the centers of gravity of the nearest dots, hereinafter also referred to as "pitch"), or by setting the distance between the dots to a distance that allows a solid pattern to be formed and then thinning out dots from the solid pattern.

[0138] Regarding "thinning out," in the case described in the above paragraph, for example, the laser irradiation points in the first region may be arranged in a manner in which, for example, a portion of the laser irradiation points in the second region is thinned out (e.g., region x1 → region x2 in FIG. 1). As a result, in a plan view of the spectacle lens, the removed portions in the first region may be arranged in accordance with the first regularity by thinning out a portion of the removed portions in the second region. This "before and after thinning out" is included in the change of the "arrangement mode" mentioned above.

[0139] Furthermore, when the pattern of the removed portion A is made up of straight lines, the removal area ratio can be adjusted by adjusting the distance between the substantially parallel straight lines.

[0140] Furthermore, when the removed portions A are formed by laser processing, the smallest unit is preferably a circle, as shown in Fig. 4, and the laser spot diameter can correspond to the size of the smallest unit of the pattern of the removed portions A. Fig. 4 is an observation image of the removed portions A formed by laser processing, in which the circular dots correspond to the removed portions A and the areas around the dots correspond to the non-removed portions B.

[0141] 5 shows an example of a pattern sample of the removed portion A formed by dots. In FIG. 5, the pattern of the removed portion A may be changed from a high area removal rate (a) to an intermediate area removal rate (b) to a low area removal rate (c).

[0142] 1 and 2, the removal area ratio of the removal portion A is adjusted by adjusting the dot density. In FIG. 1, the removal area ratio of region x1 is made higher than that of region x2, so that the decorative portions X1 and X2 look different. Specifically, the decorative portion X1 is given a decoration with a darker reflected color, a higher amount of reflected light, or a stronger shine. In FIG. 2, the removal area ratios of regions x31, x32, and x33 that make up the decorative portion X3 are gradually increased in this order, so that the decorative portion X3 is given a decoration with a gradation.

[0143] In the spectacle lens according to another aspect of the present embodiment, as long as the multiple regions are configured so that each region can be visually distinguished as a region with a different color tone, the pattern of the removed portions A does not necessarily need to be configured with a minimum unit size of 200 μm or less. For example, depending on the design of the pattern of the removed portions A, even if the minimum unit of the pattern of the removed portions A exceeds 200 μm, it is possible to achieve an intermediate appearance between a region configured only by the removed portions A and a region configured only by the non-removed portions B.

[0144] Therefore, in the spectacle lens according to another aspect of the present embodiment, the plurality of regions may include at least a first region and another region different from the first region, and the decoration corresponding to the first region may be configured to be visually distinguishable from the decoration corresponding to the other region. Note that the difference in appearance between the decorative portion corresponding to the first region and the decorative portion corresponding to the other region arises from the difference in the removal area ratio in each region.

[0145] In this specification, "visual recognition" in the context of "the decorative portion corresponding to the first region and the decorative portion corresponding to the other region can be visually distinguished" means that the decorative portion can be recognized by the eyes of a third party looking at the eyeglass lens when it is being worn, when reflected light generated in the first and second regions enters the eyes of the third party. Here, when multiple regions having different removal area ratios come into contact with each other, even if the boundary cannot be clearly recognized, "visual recognition" is possible if the multiple color tones originating from the multiple regions can be recognized.

[0146] As shown in Figures 1 and 2, the spectacle lens 1 according to this embodiment has a decorative portion formed by removing at least one layer of the laminated structure of the optical interference layer, thereby enabling the reflectance of visible light at the removed portion to be higher than that of the non-removed portion. Therefore, when viewing such a decorated lens, the reflected light enters the eye, making the decorative portion visible. Since the removed portion has sufficient smoothness, specular reflection is dominant in the reflection of light incident on the removed portion. Meanwhile, specular reflection from the removed portion is unlikely to enter the eyes of a person wearing the eyeglasses, making the decorative portion virtually invisible to the wearer. Furthermore, since the removed portion has a high transmittance, the wearer can clearly view the outside world with a sufficient field of view, just like with ordinary spectacle lenses. In other words, the eyeglasses do not obstruct the wearer's field of vision, and the eyeglasses function is fully maintained.

[0147] 1 and 2, the decorative portions X1 to X3 may be located within the eyeglass frame shape line 2. Since the design pattern can be formed within the eyeglass frame shape line in the eyeglass lens 1, new designs not found in conventional eyeglasses can be created. From the same perspective, the decorative portions may be located within a region with a radius of 30 mm from the center of the lens.

[0148] The decorative portion, which will be described later, can be formed by laser irradiation, but the decorative portion may be formed on either the object-side or the eyeglass-side side of the eyeglass lens. It is preferable that the decorative portion be visible from either side. This is useful because it allows a person wearing eyeglasses to check the decoration of their eyeglasses. However, as mentioned above, the decorative portion is not visible to the person wearing the eyeglasses, and does not obstruct their field of vision.

[0149] In the eyeglass lens according to this embodiment, the decorative portion may occupy an area of ​​5% to 99% of the entire eyeglass lens in a plan view. In other words, since the field of vision of the eyeglass wearer is unlikely to be obstructed, problems with wearing the eyeglass lens are unlikely to occur even if the area where the decorative portion is formed occupies a large proportion of the entire eyeglass lens.

[0150] <More Specific Examples of Spectacle Lens Configurations> The spectacle lens according to this embodiment includes a lens substrate and an optical interference layer. The spectacle lens according to this embodiment may also include at least one layer selected from the group consisting of a hard coat layer, an undercoat layer, and a water-repellent layer.

[0151] 5 is a schematic cross-sectional view of a spectacle lens 1 according to this embodiment. The spectacle lens 1 according to this embodiment includes a lens substrate 11, a hard coat layer 12f provided on an object-side surface 11a of the lens substrate 11, an optical interference layer 13f provided on an object-side surface 12fa of the hard coat layer 12f, and a water-repellent layer 14f provided on the object-side surface 13fa of the optical interference layer 13f.

[0152] Furthermore, when the lens substrate 11 is a finished lens (a lens having both optical surfaces formed), the eyeglass lens 1 of this embodiment further comprises a hard coat layer 12b provided on the eyeball-side surface 11b of the lens substrate 11, an optical interference layer 13b provided on the eyeball-side surface 12bb of this hard coat layer 12b, and a water-repellent layer 14b provided on the eyeball-side surface 13bb of this optical interference layer 13b. The eyeglass lens 1 also has a removed portion A on the eyeball-side or object-side surface where at least a part of the optical interference layer has been removed (the eyeball side in FIG. 5 ).

[0153] Although not shown, an underlayer may be provided between the lens substrate 11 and the hard coat layer 12f, or between the lens substrate 11 and the hard coat layer 12b.

[0154] (Lens Substrate) Examples of resins for the lens substrate include urethane resins, episulfide resins, polycarbonate resins, and acrylic resins.

[0155] The surface shape of the lens substrate is not particularly limited and may be any of flat, convex, concave, etc. The lens substrate may be used for any of a single-vision lens, a multifocal lens, a progressive-power lens, etc. For example, in a progressive-power lens, the near-vision region (near portion) and the progressive-power region (intermediate region) are usually included in the lower region, and the distance-vision region (distance portion) is included in the upper region.

[0156] The optical center thickness of the lens substrate is not particularly limited, but is preferably 0.5 mm to 10.0 mm, more preferably 0.5 mm to 5.0 mm, even more preferably 0.5 mm to 3.0 mm, and still more preferably 0.5 mm to 2.0 mm. The diameter of the lens substrate is not particularly limited, but is usually about 50 to 100 mm.

[0157] The refractive index ne of the lens substrate is preferably 1.52 or more, more preferably 1.53 or more, even more preferably 1.55 or more, even more preferably 1.58 or more, and even more preferably 1.60 or more. From the viewpoint of enhancing the effect of improving the Abbe number by containing Compound 1, the refractive index ne of the lens substrate is preferably 1.70 or more, more preferably 1.74 or more. There is no particular upper limit to the refractive index ne of the lens substrate, but it may be, for example, 1.80 or less.

[0158] (Hard Coat Layer) The eyeglass lens according to this embodiment may further have a hard coat layer to prevent scratches on the eyeglass lens. The hard coat layer is, for example, a cured film made of a curable composition containing an inorganic oxide and a silicon compound. The curable composition may further contain a polyfunctional epoxy compound.

[0159] Examples of inorganic oxides include silicon oxide, aluminum oxide, titanium oxide, zirconium oxide, tungsten oxide, zinc oxide, tin oxide, beryllium oxide, and antimony oxide, as well as composite oxides of two or more of these inorganic oxides. These may be used alone or in combination of two or more. Among these inorganic oxides, silicon oxide is preferred. Colloidal silica may also be used as the inorganic oxide.

[0160] The content of the inorganic oxide is preferably 20% by mass or more and 80% by mass or less, more preferably 25% by mass or more and 70% by mass or less, and even more preferably 25% by mass or more and 50% by mass or less, of the solid content of the curable composition.

[0161] The silicon compound is, for example, a silicon compound having a hydrolyzable group such as an alkoxy group.The silicon compound is preferably a silane coupling agent having an organic group bonded to a silicon atom and a hydrolyzable group.The organic group bonded to a silicon atom is preferably an organic group having a functional group such as an epoxy group such as a glycidoxy group, a vinyl group, a methacryloxy group, an acryloxy group, a mercapto group, an amino group, or a phenyl group, and more preferably an organic group having an epoxy group.In addition, the silicon compound may have an alkyl group bonded to silicon.

[0162] The hard coat layer can be formed by applying a curable composition to a substrate and then subjecting it to a curing treatment (thermal curing, photocuring, etc.). Commonly used methods such as dipping, spin coating, and spraying can be used to apply the curable composition. For curable compositions containing a polyfunctional epoxy compound, the curing treatment is usually carried out by heating. The heat curing treatment can be carried out, for example, by placing the lens coated with the curable composition in an environment with an ambient temperature of 50 to 150°C for about 30 minutes to 3 hours.

[0163] (Undercoat Layer) The undercoat layer can be formed from, for example, an aqueous resin composition containing at least one type of resin particles selected from the group consisting of polyurethane resin, acrylic resin, and epoxy resin.

[0164] As the aqueous resin composition, commercially available aqueous polyurethanes can be used as they are, or diluted with an aqueous solvent as necessary. Examples of commercially available aqueous polyurethanes include the "Evaphanol" series manufactured by Nicca Chemical Co., Ltd., the "Superflex" series manufactured by Daiichi Kogyo Seiyaku Co., Ltd., the "Adeka Bontiter" series manufactured by ADEKA Corporation, the "Olestar" series manufactured by Mitsui Chemicals, Inc., the "Bondic" series and the "Hydran" series manufactured by Dainippon Ink and Chemicals, Inc., the "Impranil" series manufactured by Bayer, the "Sofranate" series manufactured by Nippon Soflan Co., Ltd., the "Poise" series manufactured by Kao Corporation, the "Sunprene" series manufactured by Sanyo Chemical Industries, Ltd., the "Eizelax" series manufactured by Hodogaya Chemical Co., Ltd., and the "Neolet's" series manufactured by Zeneca Corporation.

[0165] The underlayer can be formed, for example, by applying the above-mentioned aqueous resin composition to the surface of the substrate and drying it.

[0166] (Optical Interference Layer) The optical interference layer has a laminated structure. The optical interference layer is, for example, an antireflection film with a multilayer structure in which a low refractive index layer and a high refractive index layer are laminated, and the removed portion is obtained by partially removing the low refractive index layer, which is the outermost layer of the multilayer structure. As a result, the high refractive index layer may be exposed in the removed portion. The number of layers in the antireflection layer is preferably 4 to 11, more preferably 5 to 10, and even more preferably 7 to 9. However, the present invention is not limited to this preferred example. For example, as described in Example 1 of Patent Document 1, a layer made of Cr and SnO ２ A laminated structure of the above may be adopted.

[0167] The refractive index of the low refractive index layer is preferably 1.35 to 1.80, more preferably 1.45 to 1.50 at a wavelength of 500 to 550 nm. The low refractive index layer is made of an inorganic oxide, preferably silicon oxide.

[0168] The refractive index of the high refractive index layer is preferably 1.90 to 2.60, more preferably 2.00 to 2.40, at a wavelength of 500 to 550 nm. The high refractive index layer is made of, for example, an inorganic oxide. The inorganic oxide used in the high refractive index layer is preferably zirconium oxide, tin oxide (SnO ２ ), indium tin oxide (ITO), tantalum oxide, yttrium oxide, titanium oxide, niobium oxide, and aluminum oxide, and more preferably at least one selected from the group consisting of zirconium oxide and tantalum oxide.

[0169] At least one of the high refractive index layers constituting the optical interference layer is made of tin oxide (SnO ２ Preferably, the lens is made of a conductive material such as tin oxide (ITO), indium tin oxide (ITO), etc. By using a conductive material, it is possible to impart an antistatic function to the eyeglass lens.

[0170] The optical interference layer may have a metal layer. The metal layer refers to a layer having a metallic color. Materials used for the metal layer include, for example, metals, or at least one substance having a metallic color selected from metal oxides, nitrides, carbides, and nitrogen oxides. From the viewpoint of ease of availability, metals are preferred. Examples of metal species contained in the metal layer include at least one selected from Cr, Ta, Nb, Ti, and Zr. Furthermore, the provision of a metal layer also exhibits an antistatic effect. The optical interference layer may have one or more metal layers.

[0171] Examples of the configuration of the optical interference layer are shown in the following table, where "No." indicates the number of each layer given in the figure.

[0172]

[0173] By changing the thickness of each layer of the optical interference layer and the number of layers stacked, the average reflectance in the visible light region (hereinafter also simply referred to as "average reflectance") can be adjusted. The average reflectance of the optical interference layer can be adjusted by changing the thickness of each layer, the number of layers stacked, etc., and the optimal thickness of each layer configuration can be calculated using, for example, thin film calculation software "Essential Macleod" (manufactured by Thin Film Center Inc.).

[0174] The optical interference layer can be formed as an antireflection layer by alternately laminating low refractive index layers and high refractive index layers by vacuum deposition.

[0175] Fig. 6 is a front view of the eyeglass lens according to this embodiment. As shown in Fig. 6, the eyeglass lens according to this embodiment has a removed portion A and a non-removed portion B in a plan view of the optical interference layer.

[0176] FIG. 7 is a schematic cross-sectional view of a spectacle lens according to this embodiment. In FIG. 7, the optical interference layer 13f in FIG. 5 is composed of low-refractive-index layers 131a-d or high-refractive-index layers 132a-d. The schematic cross-sectional view of FIG. 7 is a drawing showing the x-x' cross section in FIG. 6. As shown in FIG. 7, the removed portion A is a region where at least a portion of the low-refractive-index layers 131a-d or high-refractive-index layers 132a-d of the optical interference layer is absent. The removed portion A is formed by removing at least a portion of the low-refractive-index layer or high-refractive-index layer of the optical interference layer. On the other hand, the non-removed portion B is a region where a portion of the low-refractive-index layer 131 or high-refractive-index layer 132 of the optical interference layer remains. The non-removed portion B is a region where the low-refractive-index layer and the high-refractive-index layer of the optical interference layer are not removed.

[0177] The optical interference layer of a spectacle lens is usually designed to reduce the reflected light from the object-side surface, i.e., the light incident from the object-side surface and reflected back to the object-side surface. Therefore, removing at least one layer of the laminated structure of the optical interference layer changes the reflectance (reflected light intensity) of the reflected light from the object-side surface, typically increasing the reflectance. That is, in the spectacle lens according to this embodiment, the removed portion A has a different reflectance in the visible light range compared to the non-removed portion B, typically a higher reflectance. Therefore, the decorative portion of the spectacle lens according to this embodiment can improve visibility to third parties. In this specification, the "visible light range" refers to the wavelength range of 380 nm to 780 nm. For example, the average reflectance of visible light in the removed portion A formed on one surface of the spectacle lens can be at least twice the average reflectance of visible light in the non-removed portion B. This characteristic is preferably the same on both the formed side and the opposite side of the lens.

[0178] (Water-repellent layer) The eyeglass lens according to this embodiment may further include a water-repellent layer on the surface side of the optical interference layer. The water-repellent layer can be formed using a water-repellent material composition containing a fluorine-containing silane compound having a fluoroalkyl group. The water-repellent layer may be formed on either the hard coat layer or the optical interference layer, but is preferably formed on the antireflection layer. The water-repellent layer is preferably located on the outermost surface.

[0179] <Physical Properties of Spectacle Lens> In this embodiment, the average reflectance R of the region formed by the non-removed portion B with respect to the incident light from the surface on the object side is Ｂ The average reflectance R of the region formed by the removed portion A Ａ The ratio (R Ａ / R Ｂ ) is preferably 1.5 or more, more preferably 2.0 or more, even more preferably 2.5 or more, and even more preferably 3.0 or more. Ａ / R Ｂ) has no particular upper limit, but may be, for example, 6.0 or less. The above values ​​are those when the spectacle lens is decorated on the spectacle-side surface. However, it is preferable that the same numerical range be used when the spectacle lens is decorated on the object-side surface.

[0180] Furthermore, depending on the layer structure of the optical interference layer, the spectacle lens may have a relatively high reflectance in a specific wavelength range, and a slight difference in hue may be perceived between the area formed by the removed portion A and other areas. Therefore, removing at least one layer of the laminate structure of the optical interference layer changes the spectrum of reflected light from the object-side surface, and any one of the hue, lightness, and saturation of the reflected light may change. That is, in the spectacle lens according to this embodiment, the removed portion A differs from the non-removed portion B in at least one of the hue, lightness, and saturation of the reflected light. Therefore, the decorative portion of the spectacle lens according to this embodiment can increase visibility to third parties.

[0181] In this embodiment, the wavelength at which the reflectance is highest in the reflection spectrum of the visible light region may be different between the region formed by the removed portion A and the region formed by the non-removed portion B.

[0182] In spectacle lenses, the layer structure of the optical interference layer usually tends to have a small effect on the transmittance (intensity of transmitted light) of light passing through the lens. Therefore, even in the spectacle lens according to this embodiment, even if at least one layer of the laminated structure of the optical interference layer is removed, the transmittance of the transmitted light is not significantly impaired.

[0183] In the eyeglass lens according to this embodiment, the luminous transmittance T Ｂ The luminous transmittance T of the removed portion A Ａ The ratio (T Ａ / T Ｂ × 100) is preferably 80% or more, more preferably 83% or more, and even more preferably 85% or more. Ａ / T Ｂ × 100), the upper limit is not particularly limited, but is, for example, 98% or less. Ａ The value of T ＢBy keeping the luminous transmittance within the above range, the wearer will perceive all regions as transparent, and the difference in luminous transmittance will be barely perceptible, making it less likely to obstruct the wearer's field of vision.

[0184] Luminous transmittance can be measured by the method specified in JIS T 7333:2018 (ISO 8980-3:2013). Luminous transmittance is the transmittance at the optical center of the eyeglass lens, and can be measured using a spectrophotometer. For example, a "U-4100" (trade name, manufactured by Hitachi, Ltd.) can be used as the spectrophotometer. This device is also used in the examples described below. Average reflectance can also be measured using this device.

[0185] In the eyeglass lens according to this embodiment, the average reflectance R Ｂ is preferably 10% or less, more preferably 5% or less, and even more preferably 3% or less. Ｂ By designing the reflectance to be low, the removal area A is formed, and even if the increase in reflectance is slight, it becomes easy to visually distinguish it from the non-removed area B that forms the background of the decoration. Ｂ may be 0.5% or more, 1.0% or more, or 1.5% or more. Ｂ may be 0.5% or more and 10% or less, 1.0% or more and 5% or less, or 1.5% or more and 3% or less.

[0186] The average reflectance R Ａ is the average reflectance R Ｂ It is preferably higher than 3%, more preferably 4% or more, even more preferably 5%, even more preferably 6% or more, still more preferably 7% or more, and particularly preferably 8% or more. Ａ is the average reflectance R Ｂ By adjusting the design of the optical interference layer and ensuring the flatness of the processed surface of the removed portion A, the average reflectance R Ａ The average reflectance R Ａ The upper limit of the average reflectance R is not particularly limited, but may be, for example, 20% or less, 18% or less, or 15% or less. Ａmay be 4% or more and 20% or less, more than 5% and 18% or less, 6% or more and 15% or less, 7% or more and 15% or less, or 8% or more and 15% or less.

[0187] The above luminous transmittance T Ｂ is preferably 90% or more, more preferably 93% or more, even more preferably 95% or more, and even more preferably 97% or more. Ｂ By increasing the luminous transmittance T Ｂ The upper limit of the ratio is not particularly limited, but is, for example, 99% or less.

[0188] The above luminous transmittance T Ａ is preferably 80% or more, more preferably 82% or more. Ａ By increasing the luminous transmittance T Ａ The upper limit of the luminous transmittance T is not particularly limited, but may be, for example, 95% or less, 90% or less, less than 90%, or 89% or less. Ａ may be 80% or more and 95% or less, 82% or more and 90% or less, 82% or more and less than 90%, or 82% or more and 89% or less.

[0189] The luminous transmittance of the spectacle lens is preferably 70% or more, more preferably 80% or more, even more preferably 85% or more, and even more preferably 90% or more. The upper limit of the luminous transmittance is not particularly limited, but may be, for example, 100% or less, or 95% or less.

[0190] When the average reflectance and luminous transmittance satisfy the above conditions, the visibility of the decoration to other people is improved, while the visibility of the wearer is less likely to be obstructed.

[0191] [Method of manufacturing eyeglass lenses] The method of manufacturing eyeglass lenses of this embodiment will be described below. The contents described in the above [Eyeglass Lenses] can be used for content not described below (for example, preferred examples). Conversely, the contents described below can be used as preferred examples for the above [Eyeglass Lenses]. In this case, spots can be read as dots or removed portions.

[0192] <Overview of Spectacle Lens Manufacturing Method> The spectacle lens manufacturing method of this embodiment includes processing a spectacle lens having a lens substrate and an optical interference layer with a laminated structure formed on the lens substrate to form a decorative portion. The spectacle lens manufacturing method also includes a step of preparing image data corresponding to a desired decorative design (hereinafter sometimes referred to as step S1) and creating drawing data for laser processing based on the image data (hereinafter sometimes referred to as step S2), and a laser irradiation step of irradiating the optical interference layer with a laser while scanning the laser beam using a laser irradiation device, thereby forming the decorative portion.

[0193] The design of the decorative portion, such as letters, symbols, or patterns, is formed as image data based on the desired design. The image data is preferably binary data. The image data has a pixel size determined by a predetermined resolution (pixel density dpi), and the pixel size is the smallest unit that constitutes the image drawn on the lens.

[0194] Next, based on the image data, drawing data is created to be used when processing the optical interference layer by irradiating it with a laser beam such as a pulsed laser using a laser irradiation device. This is a process of creating drawing data including planned laser irradiation locations on the surface on which the optical interference layer is provided, from image data of the desired decorative design.

[0195] 8 and 9 are flow charts showing an example of the procedure of the method for manufacturing an eyeglass lens according to this embodiment. As shown in Fig. 8 and 9, laser processing is performed on a predetermined location of an eyeglass lens having an optical interference layer. This is a laser irradiation step in which, using the drawing data, a laser is irradiated onto the optical interference layer while scanning with a laser beam by a laser irradiation device, thereby forming the removed portion.

[0196] The spectacle lens includes a lens substrate and an optical interference layer having a laminated structure in which a low refractive index layer and a high refractive index layer are stacked. The spectacle lens may also include other layers, such as a hard coat layer, a base layer, and a water-repellent layer, as described above. The frame cutting process along the contour of the lens may be performed before laser processing (see FIG. 8 ) or after laser processing (see FIG. 9 ).

[0197] 8, in the case of performing the decoration process after the frame cutting, first, one optical surface of the eyeglass lens to be processed (specifically, the optical surface not to be decorated, as will be described later) is attached to a dedicated jig (jig blocking) (S101). Then, the blocked eyeglass lens is set in an edging machine, and the eyeglass lens is edging-processed (frame cutting process), and the outer shape of the eyeglass lens is cut into the frame shape (S102). The jig blocking and frame cutting processes can be performed using known techniques, so detailed explanations will be omitted here.

[0198] During laser processing, the lens height of the processing area (i.e., the three-dimensional shape of the processing area on the processing surface) is measured for the processing surface (specifically, the surface that is not blocked) of the eyeglass lens to be processed while it is still in a blocked state by the jig (S103). The measurement method is not particularly limited, but may be performed using, for example, a non-contact type three-dimensional measuring machine. The processing area is an area that includes the laser scan area described below.

[0199] After S103, or prior to or in parallel with S101 to S103, image data is prepared as described above (S1), and then drawing data is created based on the image data (S2). After measuring the lens height in the processing area, laser processing is performed by irradiating the processing area with laser light, and raster scanning is performed by moving the laser light irradiation position based on pre-prepared shape data (i.e., outline data of the lens shape) (S104). Note that the raster scanning may be vector scanning. Then, in this embodiment, before frame cutting processing, laser processing is performed on the eyeglass lens based on the outline data of the frame shape to form a design pattern consisting of a processed portion (removed portion A: incomplete optical interference layer) and an unprocessed portion (unremoved portion B: complete optical interference film).

[0200] After the design pattern is formed by laser processing, jig deblocking is performed to remove the eyeglass lens from the dedicated jig (S105), and the removed eyeglass lens is cleaned to remove any remaining material or adhering matter (foreign matter) from the laser processing (S106).Then, a final lens appearance inspection (S107) is performed, and the manufacture of the eyeglass lens is completed.

[0201] 8, when frame cutting is performed after the formation of the design pattern (after laser processing), first, as in S105, jig blocking of the eyeglass lens to be processed is performed (S111). Next, the lens height of the processing area on the processing surface of the eyeglass lens to be processed (i.e., the three-dimensional shape of the processing area on the processing surface) is measured (S112). The measurement method is the same as when decorative processing is performed after frame cutting as described above.

[0202] After measuring the lens height of the processing area, laser processing is performed by irradiating the processing area with laser light, and raster scanning is performed by moving the irradiation position of the laser light based on previously prepared drawing data (S113). Vector scanning may be used instead of raster scanning. In this way, laser processing is performed on the processing area of ​​the processing surface of the eyeglass lens.

[0203] After the design pattern is formed (after laser processing), the laser-processed eyeglass lens is subjected to frame cutting. That is, the blocked eyeglass lens is set in an edge processing machine, and edge processing (frame cutting) is performed on the eyeglass lens, and the outer shape of the eyeglass lens is cut into the frame shape (S114). After the frame cutting process, jig deblocking is performed to remove the eyeglass lens from the dedicated jig (S115), and the removed eyeglass lens is cleaned to remove any remaining material or adhering matter (foreign matter) from the processing (S116). Then, a final lens appearance inspection (S117) is performed, and the manufacture of the eyeglass lens is completed.

[0204] <Setting the Spot Size (and, in turn, the Size of the Removal Portion and Dot)> The manufacturing method of this embodiment preferably includes a step of determining the diameter (hereinafter referred to as the processing diameter) of one processing spot (hereinafter also referred to as the spot) produced by irradiation with a pulsed laser, corresponding to one pulse of the pulsed laser, in accordance with the specifications of the apparatus and the performance of the optical system. This is the smallest processing unit in drawing when performing removal processing of the optical interference layer. This makes it possible to determine the correspondence between the pixel size of the image data and the processing spot size produced by irradiation with one pulse of the pulsed laser. If this processing diameter matches the pixel size of the image data, laser processing can be performed by corresponding one pixel of the image data to one pulse.

[0205] The removed portions in the first region and the removed portions in the second region may have the same size and shape or may differ from each other. However, in consideration of ease of processing, it is preferable that the removed portions in each region have the same size and shape rather than changing the shape and diameter of the laser beam used for laser irradiation for each region.

[0206] The processing diameter per pulse can be substantially constant for one laser processing (one job), i.e., for laser processing of one surface of the eyeglass lens (here, the surface on the eyeball side). That is, in principle, processing spots with a constant pitch and a constant diameter are applied, and the color tone can be changed depending on the density, i.e., the removal area rate. By not forming some processing spots, i.e., by increasing the thinning rate of the processing spots, a region with a small removal area rate can be formed.

[0207] However, when decorating an eye lens, since the processed surface is a curved surface created by complex optical calculations, errors may occur in the focusing by three-dimensional control during scanning. However, the fluctuation in spot size due to errors (for example, within ±20%, preferably within ±15%, or within ±10%) does not affect the aesthetics of the resulting decoration.

[0208] As a preferred example of the above paragraph, in a plan view of the eyeglass lens, the smallest unit of the removed portion in the first region may be one dot-shaped removed portion, and the value of (minimum width + maximum width) / 2 in each of the dot-shaped removed portions may vary within a range of 20% (preferably within 15%, 10%) within the first region. The reason for adopting (minimum width + maximum width) / 2 is that even if the irradiated area is designed to be a perfect circle by laser irradiation, it may end up being an ellipse in the final eyeglass lens.

[0209] When a plurality of dots are linked to form the minimum unit of the removal portion, the above-mentioned rule of (minimum width+maximum width) / 2 may be adopted for each dot.

[0210] The above-mentioned (minimum width + maximum width) / 2 rule may be adopted for 80% or more of all dots in the first and second regions. Preferably, this rule is 90% or more, 95% or more, 98% or more, 99% or more, or 100% by number. Hereinafter, "80% or more by number" described in this specification can be similarly substituted with this preferred numerical range. The above-mentioned (minimum width + maximum width) / 2 rule may be adopted for 80% or more of all dots in the first region. The above-mentioned (minimum width + maximum width) / 2 rule may be adopted for 80% or more of all dots in the second region.

[0211] The machining diameter of one pulse can be, for example, in the range of 1 to 100 μm (or 1 to 200 μm). For example, it can be in the range of 5 to 80 μm, or even 10 to 70 μm, or even 10 to 50 μm. The selection of the machining diameter affects the machining speed for decorating the desired design. In addition, the pitch in the X and Y directions for forming the machining spot corresponding to one pulse can also be in the range of 1 to 100 μm. The drawing method can be raster scanning or vector scanning. Alternatively, there are no particular restrictions, and a pulse split method can also be used.

[0212] <One Specific Example of Converting Image Data to Drawing Data> The dot-shaped removal portions can be composed of a pixel, which is the smallest unit of the image data, or can be composed of a plurality of pixels. The smallest unit of each removal portion formed on the lens surface is the pixel size, preferably 200 μm or less. This size is typically difficult for the human eye to resolve. By determining the regular arrangement of such fine dot-shaped removal portions based on a predetermined removal area ratio, it is possible to express areas of different color tones in multiple regions.

[0213] Image data and drawing data will be described below. In the manufacturing method of this embodiment, image data corresponding to the desired design is first prepared. The image data can be binary data. There are no restrictions on the format of the image data, and it can be a BMP file, for example. Here, the size of one pixel is determined by the resolution (pixel density) of the image data. For example, if the image data has a resolution of 1000 dpi, one pixel is 25.4 μm. This is the smallest unit of image data.

[0214] There are no particular restrictions on the resolution of the image data to be handled. However, if high-definition decoration of eyeglass lenses is desired, a resolution of 300 dpi or higher is preferable. Furthermore, if the resolution exceeds 2000 dpi, the resolution will be further improved, but it will be difficult for the human eye to recognize it as added value.

[0215] Known image processing software (e.g., Illustrator (registered trademark)) can be used to determine how spots are allocated relative to the image resolution. In other words, when drawing data is obtained from image data, the image processing software can determine how many pulses (how many spots in the X direction and how many connected spots in the Y direction) are allocated to one pixel of the image data. In this case, by regularly arranging dots corresponding to one pixel (uniformly dispersing them in a predetermined area), it becomes easier to achieve the color tone of the predetermined area.

[0216] <Setting the number of spots per pixel> Figure 13 is an explanatory diagram showing the correspondence between one pixel of image data and processing spots produced by laser irradiation in an eyeglass lens according to an embodiment. (a) is a diagram showing a state in which 3 x 3 removed portions (the center-to-center distance of adjacent removed portions is x0' in both the X and Y directions) connected in an XY lattice are set to one pixel. (b) is a diagram showing a state in which 2 x 2 removed portions (the center-to-center distance of adjacent removed portions is x0' in both the X and Y directions) connected in an XY lattice are set to one pixel. (c) is a diagram showing a state in which 2 x 1 removed portions (the center-to-center distance of adjacent removed portions is x0" which is smaller than x0') connected in an XY lattice are set to one pixel. (d) is a diagram showing a state in which one removed portion is set to one pixel.

[0217] If the processing diameter matches the pixel size of the image data (for example, 25.4 μm in both the X and Y directions), one pixel of the image data can be assigned to one pulse for laser processing (FIG. 13(d)).

[0218] On the other hand, if the machining diameter of one pixel of image data and one laser pulse are not the same, multiple pulses can be assigned to one pixel and arranged for machining. The correspondence between the image data and the drawing data is set based on the minimum unit of the image data and the minimum unit of the drawing data.

[0219] For example, 2×2 spots are allocated to one pixel of image data (FIG. 13(b)), or 3×3 spots are allocated (FIG. 13(a)), and adjustments are made as appropriate.

[0220] The number of spots in the X and Y directions does not have to be the same. For example, one pixel may be slightly elongated in the X direction as shown in FIG. 13(c), and 2 × 1 spots may be allocated to it. In this case, the distance between the centers of the spots may be set small so that one pixel approaches a square. For example, the distance between the centers of the spots may be set narrower than the distance between the centers of the spots in the case of v × v spots (v is an integer equal to or greater than 2) as shown in FIGS. 13(a) and 13(b) (x0"<x0' in FIG. 13).

[0221] <Setting the pitch of adjacent spots in the X and Y directions (setting the XY grid)> When allocating spots to one pixel of image data, it is preferable to determine irradiation conditions including the number of spots and their arrangement (pitch in the X and Y directions) that correspond to the pixel size of the image data.

[0222] When setting the pitch of adjacent spots in the X and Y directions, the irradiation energy distribution (beam profile) and the characteristics of the design to be processed are taken into consideration, and the number of spots and their arrangement (pitch in the X and Y directions) can be selected as an optimal combination to create writing data. For example, it may be considered that the processing strength of the overlapping portions of processing spots changes depending on the irradiation energy distribution of one pulse. Therefore, whether adjacent processing spots are to overlap and, if they are to overlap, the overlap width may also be determined at this stage depending on the beam profile.

[0223] This overlap width (also broadly referred to as the "degree of overlap") is an important factor that influences whether or not the optical interference layer is damaged.

[0224] If we simply consider that overlapping is sufficient, then in cases where it is necessary to assign multiple spots to one pixel, the spots will inevitably overlap, which contradicts this idea.

[0225] Therefore, one of the distinctive features of this embodiment is that it checks the upper limit of this overlapping degree (broadly speaking, what degree of overlapping is necessary to prevent damage) and determines the minimum possible value for the distance between the centers of the spots.

[0226] Then, based on this minimum value, a virtual XY grid is set on the surface of the eyeglass lens where the removed portion is to be provided, and spots are arranged at the intersections of this XY grid, which is one of the features of this embodiment.

[0227] One method for achieving the above is as follows.

[0228] "When mutually perpendicular directions are the X direction and the Y direction, and a combination of straight lines arranged at equal intervals s in the X direction (symbol s in FIG. 12 ) and straight lines arranged at equal intervals t in the Y direction (symbol t in FIG. 12 ) is defined as an XY grid (vertical lines and horizontal lines in FIG. 12 ), the drawing data is data including at least XY coordinates (Z coordinates may also be included), and based on the relationship between the total amount of laser irradiation and the degree of damage to layers below the high refractive index layer, a minimum center-to-center distance x0 between centers of laser irradiation, which indicates the degree of overlap of laser irradiation points in the X direction, is set to suppress the occurrence of the damage, and the minimum center-to-center distance x0 is set to the equal interval s, and a minimum center-to-center distance y0 between centers of laser irradiation, which indicates the degree of overlap of laser irradiation points in the Y direction, is set to suppress the occurrence of the damage, and the minimum center-to-center distance y0 is set to the equal interval t, A common XY lattice is adopted for the first area and the second area, and each of the laser irradiation points in the first area and each of the laser irradiation points in the second area are set to include only one intersection of the XY lattice.

[0229] The "relationship between the total amount of laser irradiation and the degree of damage to the layers below the high refractive index layer" may be obtained in advance before carrying out the method for manufacturing a spectacle lens according to this embodiment.

[0230] The relationship may be obtained as follows, which is merely an example. For example, a Gaussian distribution of light intensity is obtained according to the center-to-center distance of adjacent spots. It is preferable that the conditions of this preliminary test, except for the center-to-center distance of the spots, be the same as the conditions when actually carrying out the manufacturing method of eyeglass lenses, because this will allow for more realistic test results to be obtained.

[0231] The surface of the optical interference layer when the Gaussian distribution is obtained is observed with a microscope or the like to check whether or not damage has occurred, and if so, the extent of the damage is confirmed. This allows a distance that will not cause damage, or a distance that is tolerable even if damage occurs, to be found according to the center-to-center distance of adjacent spots, and a single center-to-center distance is set.

[0232] This center-to-center distance may be set separately for the X direction (symbol s) and the Y direction (symbol t) as shown in FIG. 12 (distance s≠distance t in FIG. 12), or if it is decided from the beginning that the center-to-center distances in both directions are to be the same, the setting may be made for only one direction.

[0233] As mentioned above, it is preferable to make the arrangement of the removal portions different between the first and second regions. One example of using the above-mentioned XY lattice is to make the arrangement patterns of spots at the intersections of the XY lattice different from each other.

[0234] As mentioned above, the pattern formed by the removed portions A can be formed into a stripe shape, a grid shape, or a combination thereof by arranging the dot-shaped removed portions. The stripes or grid formed by the arrangement of the dot-shaped removed portions can be easily produced by using the virtual XY grid. In this case, by "setting each of the laser irradiation points in the first region and each of the laser irradiation points in the second region to include only one intersection of the XY grid," the removed portions can be arranged regularly, and either a stripe shape or a grid shape can be easily produced.

[0235] For example, each of the removed portions in the first region and each of the removed portions in the second region may include only one intersection of the XY grid. To take an example familiar to people in Japan, dot-shaped removed portions may be arranged so that Go stones are placed only at the intersections of the vertical and horizontal lines of a Go board.

[0236] This means that a manufacturing method step in which an XY lattice common to both the first and second regions is adopted and then performed on the intersection of those regions (for example, FIGS. 2 and 12) is reflected in the form of a specific configuration in the manufactured eyeglass lens. Although the present invention does not exclude cases in which an XY lattice common to both regions is adopted, a preferred example is to adopt an XY lattice common to both regions.

[0237] The first region can be formed simply by determining which intersections to irradiate with the laser, which reduces the difficulty in manufacturing. This configuration is also adopted in FIGS.

[0238] The rule that spots (removed portions, dots) are placed at the intersections of the XY lattice is preferably satisfied by 80% or more of all dots on the spectacle lens.

[0239] To summarize the above, in the method for manufacturing eyeglass lenses of this embodiment, it is preferable that the lattice spacing be set based on the following technical ideas: Setting the desired diameter when using a pulsed laser (for example, one value between 20 and 25 μm); Setting the center-to-center distance between dots so that even if irradiated areas (dots) are connected after the laser diameter is set, damage at the connected parts due to a high amount of light is within an acceptable range; Setting the lattice spacing based on the center-to-center distance (and thus setting the arrangement of the lattice intersections).

[0240] In a planar view of the spectacle lens, the removed portions may be thinned out according to a first thinning rule from a virtual state in which all of the XY lattice intersections have been formed, and the removed portions in the second region may be thinned out according to a second thinning rule different from the first thinning rule (e.g., x33 → x32, x31 in FIG. 2 ) from a virtual state in which all of the XY lattice intersections have been formed. More specifically, the removed portions in the first region may be arranged in accordance with the first rule by thinning out some of the removed portions in the second region. Note that setting the center-to-center distance close to the damage tolerance limit narrows the lattice spacing, increasing the number of lattice intersections and increasing the degree of freedom in thinning out some of the removed portions (increasing the number of intersections where no removed portions are to be arranged). The first thinning rule leads to the establishment of a first rule regarding the arrangement of removed portions. Similarly, the second thinning rule leads to the establishment of a second rule regarding the arrangement of removed portions.

[0241] Furthermore, by setting the XY grating in advance during laser irradiation as described above, in a plan view of the eyeglass lens, the center-to-center distance between adjacent removed portions in one direction H in the first region is always T times the center-to-center distance between adjacent removed portions in the same direction H in the second region (0.9*m / n≦T≦1.1*m / n (where m and n are natural numbers)). 0.9 and 1.1 are assumed to be a variation range. The direction H and the direction G mentioned in the regularity of the center-to-center distance may be the same direction or different directions. If they are different directions, one may be the X direction and the other the Y direction. 0.8 (preferably 0.95, 0.99) may be used instead of 0.9, and 1.2 (preferably 1.05, 1.01) may be used instead of 1.1.

[0242] The formula described in the above paragraph satisfies the requirement because the minimum center-to-center distance is used as the XY lattice spacing. Region x32 (n = 2 in the formula described in the above paragraph) and region x33 (m = 3 in the formula described in the above paragraph) in Figure 2 are examples that satisfy the relationship of the above formula. Furthermore, when region (1) enclosed by a dashed line in the upper left of Figure 12 described below is considered the second region, the dots on the horizontal line have multiple center-to-center distances (e.g., s and 2s in the figure). When region (2) to the right of region (1) enclosed by a dashed line in the upper left is considered the first region, the center-to-center distance is 3s (3s in the figure). In this case, when center-to-center distance s is used as the reference, the center-to-center distance is (3, a natural number) / (1, a natural number), i.e., 3 times. When center-to-center distance 2s is used as the reference, the center-to-center distance is (3, a natural number) / (2, a natural number), i.e., 1.5 times. Conversely, when the region (1) enclosed by a dashed line in the upper left of FIG. 12 described later is defined as the first region, and the region (2) to the right of the region (1) enclosed by a dashed line in the upper left is defined as the second region, when the center-to-center distance 3s of the second region is used as the reference, the center-to-center distance s can be expressed as (1, a natural number) / (3, a natural number), that is, 1 / 3 times, and the center-to-center distance 2s can be expressed as (2, a natural number) / (3, a natural number), that is, 2 / 3 times.

[0243] If the density of removed portions is lower in the first region than in the second region, the center-to-center distance in the first region will be greater, and m > n. The values ​​of m and n are not limited. However, a larger value of n means a larger number of lattices between adjacent removed portions in the second region, which in turn means a larger gap between dots. A larger value of m means a larger number of lattices between adjacent removed portions in the first region, which in turn means a larger gap between dots. In this case, color mixing may be less likely to occur in some cases. Therefore, m and n may have an upper limit of any natural number equal to or less than 10, and specifically, m and n may be equal to or less than 5, 4, or 3.

[0244] In addition to the above formula, the definitions in this specification regarding one direction (e.g., the X direction) can also be applied to a direction perpendicular to the one direction (e.g., the Y direction). It is preferable that the definitions be satisfied in both the one direction and the perpendicular direction. For example, in a plan view of the eyeglass lens, the center-to-center distance between adjacent removed portions in a direction H' perpendicular to the one direction H in the first region may be T' times the center-to-center distance between adjacent removed portions in the direction H' in the second region (0.9*m' / n'≦T'≦1.1*m' / n' (where m' and n' are natural numbers)).

[0245] In this way, the characteristics of one step of the manufacturing method can be reflected in the structure of the eyeglass lens.

[0246] Regarding the allocation of spots to one pixel, it is preferable to adopt the following configuration: "The number of intersections of the XY lattice to be arranged in a portion of the drawing data corresponding to one pixel of the image data is set based on the relationship between the total amount of laser irradiation and the degree of damage to the layers below the high refractive index layer, and the size of one side of one pixel of the image data."

[0247] For example, in FIG. 13(a), the number of intersections is set to 9 (3×3), and in FIG. 13(b), the number of intersections is set to 4 (2×2).

[0248] It is possible to set a common XY lattice for the entire surface of the eyeglass lens, or to set an XY lattice with different lattice intervals for each decorative portion.

[0249] <Details of Laser Processing> Next, laser processing, which is non-heat processing, will be described in more detail.

[0250] In this embodiment, as shown in Fig. 7, for example, a laser beam is irradiated onto the optical interference layer 13 covering the optical surface of the lens substrate 11, thereby partially removing at least a portion of the low refractive index layer 131 or the high refractive index layer 132 of the optical interference layer 13, thereby forming a design pattern (laser processing). The following description will be given taking as an example a case where the optical interference layer shown in Table 1 above is processed, but is not limited to this. The SiO2 of the outermost layer ２ The laser light that passes through the layer is incident on the SnO ２ When the layer is reached, SnO ２ The layer sublimes or evaporates due to the energy of the irradiation, and the SiO ２ In other words, the SiO 2 layer, which is the outermost low refractive index layer, disappears at least partially from the irradiated area by the laser processing of irradiating the laser beam. ２ Predetermined layers including the layer 131a are partially removed. At this time, the high refractive index layer below the irradiated portion may be exposed. Through this removal process, a design pattern is formed. When the high refractive index layer is exposed, the high refractive index layer may be, for example, ZrO ２ Layer 132c.

[0251] SnO ２ The layer 132a can be formed to a small thickness (for example, 3 to 20 nm, more preferably 3 to 10 nm). In this embodiment, the thickness is set to 5 nm.

[0252] In addition, SnO ２ The reactive layer has high reactivity to laser irradiation. ２ In addition, indium tin oxide (ITO) can be used.

[0253] By laser irradiation, SnO ２However, the reaction layer does not need to be completely removed, and a portion of the reaction layer may remain at the irradiated portion. For example, the reaction layer may be at least partially removed in the thickness direction of the layer by laser irradiation.

[0254] The phenomenon that occurs during laser irradiation is thought to be as follows: ２ It is preferable that the reactive layer is a conductive layer having a higher conductivity than the other layers included in the laminate structure. When the reactive layer has conductivity, the reactive layer is made of a material selected from the group consisting of SiO 2 and ITO. ２ , and ZrO ２ The reactive layer has a smaller band gap than the other layers, which causes excitation when irradiated with a laser under the conditions described below, and is therefore more likely to absorb energy. Therefore, the reactive layer is more likely to disappear due to sublimation / evaporation than other layers. At this time, a phenomenon known as multiphoton absorption (e.g., two-photon absorption) is thought to occur, which is believed to enable efficient laser processing.

[0255] In addition, SnO ２ After disappearance, the lower ZrO ２ However, there is a concern that the irradiation energy may cause damage such as evaporation or dissolution, but by controlling the irradiation conditions to take advantage of the delay before such damage occurs, it is possible to remove essentially only the reaction layer and the layers above it. It has been found that selecting an ultrashort pulse laser, which will be described later, is advantageous for such precise processing control.

[0256] Here, a laser processing device used for laser processing will be briefly described. Fig. 10 is an explanatory diagram showing an example of the schematic configuration of a laser processing device used in the method for manufacturing eyeglass lenses according to this embodiment.

[0257] As shown in FIG. 10 , the laser processing apparatus used in this embodiment includes a laser light source unit 21, an aperture 22, a galvanometer scanner unit 24, and an optical system 25, and is configured to irradiate the optical interference layer 13 with laser light via these units 21, 22, 24, and 25.

[0258] The laser light source unit 21 emits laser light used in laser processing, and is configured to emit an ultrashort pulse laser.

[0259] The pulse width of the ultrashort pulse laser in this embodiment is preferably 0.01 picoseconds (10 femtoseconds) or more and 100 picoseconds or less, more preferably 0.01 picoseconds or more and less than 50 picoseconds, and even more preferably 0.1 picoseconds or more and less than 15 picoseconds.

[0260] The wavelength of the ultrashort pulse laser can be, for example, 355 nm THG (Third Harmonic Generation) or 532 nm SHG (Second Harmonic Generation), as well as a fundamental wavelength of 1064 nm. The irradiation beam diameter can be selected according to the desired processing design. In order to process a fine design with high resolution, it is effective to narrow the beam diameter. In this case, shorter wavelengths are more advantageous. Therefore, of the above wavelengths, 532 nm is preferred, and 355 nm is more preferred. Alternatively, 266 nm FHG (Fourth Harmonic Generation) is also suitable.

[0261] The pulse energy of the ultrashort pulse laser is, for example, 0.1 μJ to 30 μJ (maximum of about 60 μJ) at 50 kHz, and the beam diameter of the ultrashort pulse laser is, for example, 10 μm to 30 μm.

[0262] The following was found regarding laser irradiation conditions: (1) When the pulse width of the ultrashort pulse laser is less than 0.1 picoseconds, good processing can be performed with any wavelength between 266 and 1064 nm. A shorter wavelength is more advantageous for fine processing. However, this places a greater burden on production in terms of equipment maintenance and costs. (2) When the pulse width of the ultrashort pulse laser is 0.1 picoseconds or more and less than 1 picosecond, good processing can be performed with any wavelength between 266 and 1064 nm. A shorter wavelength is more advantageous for fine processing. (3) When the pulse width of the ultrashort pulse laser is 1 picosecond or more and less than 100 picoseconds, good processing can be performed with any wavelength between 266 and 1064 nm. A shorter wavelength is more advantageous for fine processing. This is advantageous in terms of equipment maintenance, costs, and stability of production conditions. (4) When the pulse width of the ultrashort pulse laser is 100 picoseconds or more and less than 1 nanosecond, non-uniform processing stability may occur depending on the wavelength used. For example, when the wavelength to be applied is 266 nm on the short wavelength side, SnO ２ In addition, damage to the lower layer may occur due to the reaction. Even with 355 nm, it is difficult to obtain uniform processing depending on the fluctuation of irradiation conditions, and the removal processing may be difficult due to the SnO ２ (5) The pulse width of the ultrashort pulse laser is 1 nanosecond or more. ２ Furthermore, it is difficult to select processing conditions for selectively removing the layer on the surface side.

[0263] In the cases of (4) and (5) above, the visibility of the processed pattern may be affected. For example, in the case of eyeglass lenses, there is a risk of interference with the wearer's field of vision.

[0264] In order to prevent the above-mentioned inconveniences, it is essential that the removal processing using an ultrashort pulse laser is uniform in terms of the processing diameter and processing depth. To achieve this, it is considered useful to apply a predetermined ultrashort pulse width to control and utilize the duration of the energy emitted by irradiation and the delay in ablation of the underlying material.

[0265] As long as such an ultrashort pulse laser can be emitted, the specific configuration of the laser light source unit 21 or the combination of wavelength and pulse width is not particularly limited.

[0266] The laser processing apparatus may further include a beam shaper unit. For example, a beam shaper may be used to convert the laser light from the laser light source unit 21 from a Gaussian energy distribution to a top-hat energy distribution, thereby enabling laser processing using laser light with a uniform energy distribution. These means change the energy distribution of the irradiation spot. Therefore, the suitability of these means can be taken into consideration when selecting the arrangement and pitch of the processing diameter relative to the pixels of the image data.

[0267] Alternatively, the design pattern may be formed by applying energy irradiation with a Gaussian distribution without using a beam shaper.

[0268] On the other hand, the present inventors have further discovered that even more significant effects can be obtained by incorporating the following innovations. Specifically, it has been discovered that it is possible to form uniformly removed portions A in a fine pattern with a minimum unit of 200 μm or less, and to process a spectacle lens that satisfies the conditions characteristic of this embodiment. It has also been discovered that it is possible to stably process removed portions A into a smooth surface with a surface roughness Ra of less than 0.0080 μm.

[0269] Specific examples of the configuration include satisfying at least one of the following: The beam divergence angle of the ultrashort pulse laser is less than 0.300 mrad. The mode quality M2 of the ultrashort pulse laser is 1.1 or less. An aperture is applied to the beam from the ultrashort pulse laser, and the aperture diameter is 80 μm or less, or 60 μm or less, or further 30 μm or less, or 25 μm or less.

[0270] It has been found that by employing the above-described configuration, it is possible to irradiate the optical interference layer of the eyeglass lens, which is the workpiece, with necessary and sufficient energy while maintaining uniformity of the surface.

[0271] In addition, spectacle lenses are usually constructed with curved surfaces. Therefore, by adopting the above-described configuration, it is possible to provide a margin in the depth of focus compared to when a top-hat type distribution is directly adopted. This means that, as mentioned above, it is advantageous for stably obtaining smoothness as a region.

[0272] The galvano scanner unit 24 moves the irradiation position of the laser light from the laser light source unit 21 two-dimensionally or three-dimensionally, thereby enabling scanning with the laser light, thereby enabling the formation of a desired design pattern by laser processing. Note that the scannable range of the laser light by the galvano scanner unit 24 (i.e., the maximum laser processing area) is set to a size and shape that can completely encompass the outer shape of the eyeglass lens to be processed.

[0273] The optical system 25 can be configured by combining optical lenses such as telecentric lenses and mirrors, and guides the laser light from the laser light source unit 21 so that the laser light reaches the processing location of the eyeglass lens.

[0274] Next, a laser processing procedure performed using the laser processing device configured as above will be described.

[0275] In laser processing, first, the eyeglass lens to be processed is set in a laser processing device. At this time, the eyeglass lens is set so that the optical surface of the eyeglass lens, more specifically, the surface of the optical interference layer 13 on the optical surface, becomes the surface to be processed. The optical surface to be processed may be either the surface on the object side or the surface on the eyeball side, but here, for example, the surface on the eyeball side is used as the surface to be processed.

[0276] After the eyeglass lens is set, the laser light source unit 21 and the galvano scanner unit 24 are operated based on the drawing data created in advance (i.e., data for laser processing created based on image data corresponding to the design to be obtained). As a result, the processing area on the processing surface of the eyeglass lens is irradiated with the ultrashort pulse laser so as to form a removal pattern that is part of the design configuration.

[0277] When the ultrashort pulse laser is irradiated, the ultrashort pulse laser passes through the water-repellent layer 14 on the surface to be processed of the eyeglass lens and reaches the optical interference layer 13 on the surface to be processed. When the ultrashort pulse laser reaches the optical interference layer 13, laser processing is performed by the ultrashort pulse laser.

[0278] The ablation processing of this embodiment is a technology that enables highly energy-efficient processing by utilizing the multiphoton absorption phenomenon of an ultrashort pulse laser. More specifically, it is a removal processing that minimizes the thermal influence around the processing area and causes the irradiated area of ​​the laser beam to instantly melt, evaporate, or sublimate and scatter. With this type of laser processing, highly reactive materials are instantly removed from the irradiated area, resulting in less thermal influence around the processing area and reduced thermal damage (such as deformation due to heat).

[0279] The laser processing according to this embodiment can be ablation processing as non-heating processing. This processing can cause a multiphoton absorption process (e.g., a two-photon absorption process) that results in the aforementioned multiphoton absorption phenomenon. Therefore, multiphoton absorption can efficiently and effectively process materials that are relatively transparent (highly transmittant) to lasers. In this case, a wide range of applicable laser wavelengths can be used, and wavelengths of laser light such as 355 nm (THG), 532 nm (SHG), and 1064 nm can be advantageously used.

[0280] As mentioned above, a picosecond laser or femtosecond laser with a short pulse width is advantageous for inducing the multiphoton absorption. Specific values ​​include a pulse width of less than 100 picoseconds, preferably less than 50 picoseconds, and more preferably less than 1 picosecond (i.e., femtosecond). The pulse width is preferably 10 femtoseconds or more and less than 100 picoseconds.

[0281] When laser processing is performed by irradiating an ultrashort pulse laser, the SiO ２ through the reaction layer (SnO ２), and the reaction layer reacts instantaneously and sublimes / evaporates, resulting in the outermost layer of SiO ２ In this way, only the predetermined layers, including the outermost layer of the optical interference layer, are partially removed in the shape of the laser-processed portion, which is part of the design pattern. In addition, the corresponding portion of the water-repellent layer 14 is also removed. As a result, SnO ２ ZrO located on the lower side of the layer 132a ２ Layer 132b may be exposed.

[0282] By performing the above-described laser processing, the SiO ２ Predetermined layers including layer 131a are partially removed, and a design pattern is formed (laser processing) on ​​the processed surface of the eyeglass lens. As described above, the irradiated areas where the predetermined laser irradiation has been performed are partially processed within the processed surface.

[0283] According to the above method, by designing the image data of the laser-processed portion with a minimum unit size of 200 μm or less, it is possible to form the removed portion A in a pattern configured with a minimum unit processing diameter of 200 μm or less. Therefore, in the manufacturing method of this embodiment, the optical interference layer is irradiated with an ultrashort pulse laser in a predetermined pattern configured with a minimum unit size of 200 μm or less, and at least one layer of the laminate structure can be removed in this pattern. As a result, by adjusting the pattern and removal area ratio of the decorative portion during this removal, the color tone of the decorative portion can be changed for each region, and its visibility can be controlled.

[0284] The drawing data for the laser-processed portion may be composed of dots, with the spot diameter of one laser processing pulse as the smallest unit, for example. In this case, dense patterns can be formed more precisely. Furthermore, by performing processing while partially overlapping each dot formed by laser processing, it is easy to form not only dots but also various characters, symbols, line drawings, etc. as the removed portion A. For example, by forming multiple dots in one direction while partially overlapping them, it is possible to form a linear removed portion A with a line width equal to the diameter of the dot. Furthermore, by further overlapping linear removed portions A that can be formed in this way in the line width direction, it is possible to form an area consisting only of removed portions A.

[0285] Furthermore, by using a dot as the minimum unit of drawing data for the laser processing portion, the removal area ratio of a pattern formed by regularly arranging dots can be easily adjusted by adjusting the spacing between dots. That is, by narrowing the spacing between dots and creating a pattern with a high dot density, it is possible to form an area with a high removal area ratio.

[0286] The above describes the case where one pixel of image data and one spot per pulse of drawing data are the same size, but even when multiple spots are assigned to one pixel, an area with a desired color tone can be formed by forming an removal pattern for each pixel.

[0287] [Eyeglasses] The eyeglasses according to this embodiment can also be applied to eyeglasses including an eyeglass frame and an edged eyeglass lens having an object-side surface and an eyeball-side surface. The above-described content can be applied to eyeglasses by replacing the "eyeglass lens" described above with "edge-shaped eyeglass lens."

[0288] The eyeglass frame may be a regular full-rim type, or a rimless or half-rim type (this type includes eyeglass frames in which there is no rim even in part around the periphery of the eyeglass lens after shaping).

[0289] [Optical Element] The eyeglass lens according to this embodiment can also be used as an optical element having a similar configuration. For the optical element, a substrate and an optical interference layer suitable for the intended use are selected. Examples of optical elements include protective films for liquid crystal screens, window elements, face shields, and trial eyeglass lenses that do not yet reflect the wearer's prescription. The above-mentioned content can be applied by replacing the term "eyeglass lens" with "optical element."

[0290] The technology according to this embodiment makes it possible to decorate eyeglass lenses with desired designs, such as letters, symbols, and patterns, as well as technical or commercial markings, and also provides eyeglass lenses, eyeglasses, and methods for manufacturing eyeglass lenses that are decorated with greater freedom and richer expression.

[0291] Examples of the eyeglass lens according to this embodiment will be described below, but the present invention is not limited to the following examples.

[0292] The present invention corresponds to a spectacle lens having a region (50% removed) (e.g., the first region) prepared in the following Test Example 2 and another region. The other region referred to here is, for example, the unprocessed region in the following Test Example 1 or the solid pattern region in the following Test Example 3, or a variation of the region prepared in Test Example 2. Therefore, to be precise, each of the following Test Examples is a reference example rather than an embodiment. Each of the following Test Examples is a test to quantitatively demonstrate that Test Example 2, which corresponds to the first region, has a color tone different from both the unprocessed region and the solid pattern region.

[0293] An anti-reflection coating (product name: Venus Guard Coat Lapis RUV) was formed on the object-side and eyeball-side surfaces of a urethane lens substrate. The anti-reflection coating on the eyeball-side surface was processed by irradiating it with an ultrashort pulse laser. The laser conditions were a wavelength of 355 nm, a pulse width of 12 picoseconds, and a processing diameter per pulse of approximately 20 μm. The dimensions of the processed area were 20 mm x 20 mm. Specifically, the average reflectance and color space values ​​L*, a*, and b* shown below were measured for this 20 mm x 20 mm area.

[0294] As Test Example 1, a spectacle lens with the anti-reflection coating that had not been subjected to the above processing was prepared. As Test Example 2, a spectacle lens with the anti-reflection coating that had been subjected to the above processing on the 20 mm x 20 mm area and had a removal area ratio of 50% was prepared. To achieve a removal area ratio of 50%, the above XY lattice was imagined, and spots (intersections of the XY lattice) were assigned to one pixel (three in the X direction and two in the Y direction). Then, these connected spots were arranged at intervals of one intersection in the X direction and two intersections in the Y direction. As Test Example 3, a spectacle lens with the anti-reflection coating that had a solid pattern formed on it, with the unprocessed portions being zero, was prepared.

[0295] The average reflectance and color space values ​​for each test example are shown in the table below. A plot of the average reflectance for each test example (vertical axis: average reflectance (%), horizontal axis: wavelength (nm)) is shown in Figure 14.

[0296] The above table confirms the change in hue due to the processing of the present invention.

[0297] First, when comparing Test Examples 2 and 3 (50% processed, 100% processed) with Test Example 1 (unprocessed), it can be seen that the lightness index L* increases, and the lightness becomes higher.

[0298] Furthermore, in Test Example 2 (50% processed), the color coordinate a* value decreased and the color coordinate b* value increased significantly compared to Test Example 1 (unprocessed). This indicates that Test Example 2 (50% processed) exhibited a decrease in redness, a decrease in blueness, and an increase in yellowness compared to Test Example 1 (unprocessed). Furthermore, the changes in the absolute values ​​of a* and b* indicate a decrease in saturation. This indicates that the color tone γ produced by Test Example 2 (50% processed) is different from the color tone α produced by Test Example 3 (100% processed) and the color tone β produced by Test Example 1 (unprocessed).

[0299] 1... eyeglass lens, 2... eyeglass frame shape line, 11... lens substrate, 12... hard coat layer, 13... optical interference layer, 14... water-repellent layer, 21... laser light source unit, 22... aperture, 24... galvano scanner unit, 25... optical system, 131... low refractive index layer, 132... high refractive index layer, A... removed portion, B... non-removed portion, x1, x2, x31, x32, x33... region, X1, X2, X3... decorative portion

Claims

1. An eyeglass lens having an object side surface and an eyeball side surface, comprising: a lens substrate; and an optical interference layer having a laminated structure provided on at least one surface of the lens substrate, wherein at least one of the surfaces of the eyeglass lens on which the optical interference layer is provided is a first region in which removal portions where at least one layer of the optical interference layer is locally removed are arranged with a first regularity, and non-removal portions where the one layer is not removed exist between the removal portions; and a second region which is a region where the removal portions are arranged with a second regularity or a region composed of the non-removal portions, and the first region and the second region are visually recognized as regions having different color tones.

2. The eyeglass lens according to claim 1, wherein the color tone includes at least one of light and shade of color, gradation of color, light and shade due to difference in the amount of reflected light, and strength and weakness of the way of shining, which occur in the region.

3. The eyeglass lens according to claim 2, wherein the color tone is single within the first region and the color tone is single within the second region.

4. The optical interference layer having a laminated structure is an antireflection film having a multilayer structure in which a low refractive index layer and a high refractive index layer are laminated, and the removal portion is formed by partially removing the low refractive index layer on the outermost surface of the multilayer structure.

5. The eyeglass lens according to claim 1, having the first region and a second region in which the removal portions are arranged with a second regularity, and the arrangement modes of the removal portions in the first region and the second region are different from each other.

6. The first regularity is a mode in which the removal portions are repeatedly arranged in at least one direction.

7. In a plan view of the eyeglass lens, the minimum unit of repetition of the removal portions in the first region is one dot-shaped removal portion, and in 80% or more of the number of the dots in the first region, the value of (minimum width + maximum width) / 2 in each of the dot-shaped removal portions varies within a range of 20% within the first region.

8. In a plan view of the eyeglass lens, the minimum unit of repetition of the removal portions in the first region is a plurality of dot-shaped removal portions connected to each other.

9. The non-removal part of the first region surrounds each of the removal parts, or is surrounded by the removal parts, or is a combination thereof, the spectacle lens according to claim 1.

10. In a plan view of the spectacle lens, when the mutually perpendicular directions are defined as the X direction and the Y direction, and a combination of a straight line arranged at equal intervals in the X direction and a straight line arranged at equal intervals in the Y direction is defined as an XY grid, the same XY grid is adopted for the first region and the second region, and each of the removal parts in the first region and each of the removal parts in the second region includes only one intersection of the XY grid, the spectacle lens according to claim 5.

11. In a plan view of the spectacle lens, the removal parts in the first region are thinned out according to a first thinning-out regularity from a virtual state in which removal parts are formed at all intersections of the XY grid, and the removal parts in the second region are thinned out according to a second thinning-out regularity different from the first thinning-out regularity from a virtual state in which removal parts are formed at all intersections of the XY grid, the spectacle lens according to claim 10.

12. The first regularity includes a rule of the center-to-center distance between the removal parts in one direction G in the first region, and the second regularity includes a rule of the center-to-center distance between the removal parts in one direction G in the second region, the spectacle lens according to claim 5.

13. In a plan view of the spectacle lens, the center-to-center distance between adjacent removal parts in one direction H in the first region is T times the center-to-center distance between adjacent removal parts in the same direction H in the second region, and 0.9 * m / n ≤ T ≤ 1.1 * m / n (where m and n are natural numbers), the spectacle lens according to claim 5.

14. The second region consists only of the removal parts, the spectacle lens according to claim 5.

15. The visual transmittance of both the first region and the second region is 80% or more, the spectacle lens according to claim 5.

16. The maximum width of the removal part is 200 μm or less, the spectacle lens according to claim 1.

17. A pair of glasses comprising a spectacle frame and a spectacle lens after spherical processing having an object-side surface and an eyeball-side surface, wherein the spectacle lens is the spectacle lens according to any one of claims 1 to 16.

18. A method for manufacturing an eyeglass lens having a surface on the object side and a surface on the eyeball side, the eyeglass lens having a lens substrate and an optical interference layer having a laminated structure provided on at least one of the surfaces of the lens substrate. For at least one of the surfaces on which the optical interference layer is provided, a first region in which removal portions where at least one layer of the optical interference layer has been locally removed by laser irradiation are arranged with a first regularity, and non-removal portions where the one layer has not been removed are present between the removal portions; and a second region which is a region where the removal portions are arranged with a second regularity by laser irradiation or a region composed of the non-removal portions are formed, and the first region and the second region are made visible as regions having different color tones. A method for manufacturing an eyeglass lens.

19. A step of creating drawing data including planned laser irradiation locations on the surface on which the optical interference layer is provided from image data of a desired decorative design; and a laser irradiation step of irradiating the optical interference layer while scanning a laser beam with a laser irradiation device using the drawing data to form the removal portions. The optical interference layer having the laminated structure is an antireflection film having a multilayer structure in which a low refractive index layer and a high refractive index layer are laminated, and the removal portions are formed by partially removing the low refractive index layer on the outermost surface of the multilayer structure. The method for manufacturing an eyeglass lens according to claim 18.

20. The method for manufacturing an eyeglass lens according to claim 19, wherein the first region and a second region in which the removal portions are arranged with a second regularity by laser irradiation are formed, and the arrangement modes of the removal portions in the first region and the second region are made different from each other.

21. When the mutually perpendicular directions are defined as the X direction and the Y direction, and a combination of a straight line arranged at equal intervals s in the X direction and a straight line arranged at equal intervals t in the Y direction is defined as an XY grid, the drawing data is data including at least XY coordinates. Based on the relationship between the total light amount of laser irradiation and the degree of damage to the lower layer after the high refractive index layer, the minimum center-to-center distance x0 between the central points of laser irradiation, which indicates the degree of overlap of the laser irradiation positions in the X direction, is set so as to suppress the occurrence of damage, and the minimum center-to-center distance x0 is set to the equal interval s. The minimum center-to-center distance y0 between the central points of laser irradiation, which indicates the degree of overlap of the laser irradiation positions in the Y direction, is set so as to suppress the occurrence of damage, and the minimum center-to-center distance y0 is set to the equal interval t. A common XY grid is adopted for the first region and the second region, and each laser irradiation position in the first region and each laser irradiation position in the second region are set to include only one intersection of the XY grid. The method for manufacturing a spectacle lens according to claim 20.

22. Based on the relationship between the total light amount of laser irradiation and the degree of damage to the lower layer after the high refractive index layer, and the size of one side of one pixel of the image data, in the drawing data, the number of intersections of the XY grid arranged within the portion corresponding to one pixel of the image data is set. The method for manufacturing a spectacle lens according to claim 21.

23. The laser irradiation positions in the first region are arranged in a pattern in which the irradiation positions are thinned out according to a first thinning rule from a virtual state in which all intersections of the XY grid are irradiated with laser. The laser irradiation positions in the second region are arranged in a pattern in which the irradiation positions are thinned out according to a second thinning rule different from the first thinning rule from a virtual state in which all intersections of the XY grid are irradiated with laser. The method for manufacturing a spectacle lens according to claim 21.

24. The variation range of the value of (minimum width + maximum width) / 2 at each of the laser irradiation positions in the first region and the second region is within 20%. The method for manufacturing a spectacle lens according to claim 20.

25. The drawing data corresponds to one processing spot by laser irradiation for one pixel of the image data. The method for manufacturing a spectacle lens according to claim 19.

26. The method for manufacturing a spectacle lens according to claim 19, wherein the drawing data corresponds to a plurality of processing spots by laser irradiation for one pixel of the image data.

27. The method for manufacturing a spectacle lens according to claim 19, wherein the drawing data corresponds to a plurality of processing spots by laser irradiation for one pixel of the image data, and the plurality of processing spots partially overlap each other.

28. The method for manufacturing a spectacle lens according to claim 19, wherein the laser is an ultrashort pulse laser having a pulse width of 10 femtoseconds or more and less than 100 picoseconds.

29. An optical member, comprising: a base material; and an optical interference layer having a laminated structure provided on the surface of the base material. In the optical member, the surface on which the optical interference layer is provided is a first region in which removal portions where at least one layer of the optical interference layer is locally removed are arranged with a first regularity, and non-removal portions where the one layer is not removed exist between the removal portions; and a second region which is a region in which the removal portions are arranged with a second regularity or a region composed of the non-removal portions. The first region and the second region are visually recognized as regions having different color tones.

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