Eyeglass lenses and glasses

Abstract

The present invention provides an eyeglass lens (1) and related technology, wherein the lens substrate having an optical surface and an anti-reflection film covering the optical surface of the lens substrate, the anti-reflection film has a multilayer structure including a stack of a low refractive index layer and a high refractive index layer, the anti-reflection film includes a reaction layer having a relatively higher reactivity to irradiation with an ultrashort pulse laser than other layers included in the anti-reflection film, and at least partially a predetermined layer including the outermost layer of the multilayer structure is removed to form a removal location, the high refractive index layer on the lower side of the reaction layer or a partially remaining reaction layer is exposed, thereby providing a marking (2M) in the shape of an eyeglass lens so that the removal location can be seen by visible light.

Description

Technology Field

[0001] The present invention relates to eyeglass lenses and eyeglasses. Background Technology

[0002] It is known that coloring or design is provided in a portion within the spectacle frame of an spectacle lens (see, for example, Patent Documents 1 and 2). In this specification, the spectacle frame is simply referred to as a frame, and the rim (a member into which a jade-shaped spectacle lens is inserted) among the spectacle frames is described in particular. A jade-shaped spectacle lens is also referred to as a jade-shaped lens. Jade-shaped processing is also referred to as a frame cut. Prior art literature

[0003] Patent Document 1: Japanese Published Patent Application No. 2004-004727 Patent Document 2: Japanese Published Patent Application No. 2007-058146 The problem to be solved

[0004] Currently, most eyeglass lenses are made of plastic, and as a result of material improvements, they possess sufficient strength against breakage. Consequently, protection by the rim is no longer strictly necessary. The frame, including the rim, enters the wearer's field of vision. Therefore, there is a problem in that some wearers may perceive the rim as an unnecessary obstruction to their vision. Additionally, there are situations where the lightweighting of eyeglasses is being supported.

[0005] Under such circumstances, it is desirable to reduce the weight of the frame and the weight of the decorations on the glasses as much as possible. Taking the above situation into account, thin frames and lightweight frames are being developed. As examples of lightweight frames, rimless type frames without rims and half-rim type frames with rims only on a part (for example, the lower half) are being developed.

[0006] While the above situation exists, it was discovered that there are many people who desire glasses with rims. The inventors of this invention have diligently investigated this desire and discovered that rims have the following advantages.

[0007] In other words, it can be seen that, in addition to the advantage of maintaining the strength of the glasses, the rim has the utility of accentuating the contours of the lens, thereby making the wearer's facial features look more defined.

[0008] The present disclosure aims to provide a technique that improves the appearance effect by appropriately emphasizing the contour of an oval lens, regardless of the presence or absence of a rim. means of solving the problem

[0009] The first aspect of the present invention is

[0010] A lens substrate having an optical surface, and

[0011] The above-mentioned lens substrate is provided with an anti-reflection film covering the optical surface of the above-mentioned lens substrate, and

[0012] The above anti-reflection film has a multilayer structure including a stack of a low-refractive-index layer and a high-refractive-index layer,

[0013] The above anti-reflection film comprises a reactive layer having a reactivity that is relatively higher than that of other layers included in the anti-reflection film, to the extent that it is sublimated or evaporated by irradiation with an ultrashort pulse laser.

[0014] In a removal site formed by at least partially removing a predetermined layer including the outermost layer of the above multilayer structure, the high refractive index layer located on the lower side of the reaction layer, or a partially remaining reaction layer, is exposed, thereby providing a marking in the shape of jade so that the removal site can be seen by visible light, and the marking is formed as a band-shaped area of ​​a predetermined width near the outer edge along the shape of the outer edge of the lens after the frame cut.

[0015] It is an eyeglass lens.

[0016] The second aspect of the present invention is

[0017] The above-mentioned removal site also comprises an ornamental pattern other than the above-mentioned jade-shaped marking.

[0018] It is an eyeglass lens described in the first embodiment.

[0019] The third aspect of the present invention is

[0020] The above decorative pattern is provided at the inner end of the above jade-shaped marking.

[0021] It is an eyeglass lens described in the second embodiment.

[0022] The fourth aspect of the present invention is

[0023] The above jade-shaped marking is ring-shaped.

[0024] It is an eyeglass lens described in any one of the first to third embodiments.

[0025] The fifth aspect of the present invention is

[0026] An spectacle lens with an edging line formed on the outer edge, and

[0027] A frame having the above-mentioned spectacle lens mounted thereon,

[0028] The above eyeglass lenses are

[0029] A lens substrate having an optical surface, and

[0030] The above-mentioned lens substrate is provided with an anti-reflection film covering the optical surface of the above-mentioned lens substrate, and

[0031] The above anti-reflection film has a multilayer structure including a stack of a low-refractive-index layer and a high-refractive-index layer,

[0032] The above anti-reflection film comprises a reactive layer having a reactivity that is relatively higher than that of other layers included in the anti-reflection film, to the extent that it is sublimated or evaporated by irradiation with an ultrashort pulse laser.

[0033] In a removal site formed by at least partially removing a predetermined layer including the outermost surface layer of the above multilayer structure, a marking is provided as the above-mentioned border line such that the removal site can be seen by visible light by exposing the high-refractive-index layer located on the lower side of the reaction layer, or the partially remaining reaction layer, and the marking is formed as a band-shaped area of ​​a predetermined width near the outer edge along the shape of the outer edge of the lens after the frame cut.

[0034] With the above-mentioned eyeglass lens mounted on the frame, when observed from the object surface side of the eyeglass lens, the above-mentioned outline is visible.

[0035] It is glasses.

[0036] The sixth aspect of the present invention is

[0037] The above removal location also comprises an ornamental pattern other than the above overhead line.

[0038] It is the glasses described in the fifth embodiment.

[0039] The seventh aspect of the present invention is

[0040] The above decorative pattern is provided at the inner end of the above decorative line.

[0041] It is the glasses described in the 6th embodiment.

[0042] The eighth aspect of the present invention is

[0043] The above overhead line is loop-shaped.

[0044] It is a pair of glasses described in any one of the 5th to 7th modes.

[0045] The ninth aspect of the present invention is

[0046] The type of rim on the above frame is rimless or half rim, and

[0047] The above overhead line is marked as a pseudo-rim at least in locations where the above-mentioned rim is not present,

[0048] It is a pair of glasses described in any one of the 5th to 7th modes. Effects of the invention

[0049] According to the present invention, the contour of the jade-shaped lens is appropriately raised regardless of the presence or absence of a rim, thereby improving the appearance effect. Brief explanation of the drawing

[0050] FIG. 1a is a front view showing an eyeglass lens according to one embodiment of the present invention. FIG. 1b is a bottom view showing an eyeglass lens according to one embodiment of the present invention. FIG. 2a is a front view showing an eyeglass lens according to another embodiment of the present invention. Figure 2b is a partial schematic front view of the glasses after the glasses lens of Figure 2a has been frame-cut and inserted into the frame. FIG. 2c is a partial schematic front view of an eyeglasses after the eyeglass lens of FIG. 2a has been frame-cut and inserted into a half-rim type frame. It is a front view showing an eyeglass lens according to another embodiment of the present invention. FIG. 3a is a front view showing an eyeglass lens according to another embodiment of the present invention. Figure 3b is a partial schematic front view of the glasses after the glasses lens of Figure 3a has been frame-cut and inserted into a half-rim type frame. FIG. 4 is a front view showing an eyeglass lens according to another embodiment of the present invention. FIG. 5 is a front view showing an eyeglass lens according to another embodiment of the present invention. FIG. 6 is a front view showing an eyeglass lens according to another embodiment of the present invention. Figure 7 is an explanatory diagram for illustrating an example of suitability of a wire frame based on Figure 4. FIG. 8 is a front view showing an example of processing an eyeglass lens according to one embodiment of the present invention. FIG. 9 is a drawing showing a specific example in which, based on FIG. 1a, the decorative pattern is provided on the inner side of the decorative line and on the edge of the jade-shaped section (for example, at least one of the four corners). FIG. 10 is a flowchart illustrating an example of a procedure for a method of manufacturing an eyeglass lens according to one embodiment of the present invention. FIG. 11 is a side cross-sectional view showing an example of a laminated structure of a thin film in an eyeglass lens according to one embodiment of the present invention. FIG. 12 is an explanatory diagram showing a schematic configuration example of a laser processing device used in a method for manufacturing eyeglass lenses according to one embodiment of the present invention. FIG. 13 is an explanatory diagram showing an example of the main part configuration of an eyeglass lens according to one embodiment of the present invention. Specific details for implementing the invention

[0051] <Notice of this embodiment>

[0052] Hereinafter, embodiments of the present invention will be described based on the drawings.

[0053] FIG. 1a is a front view showing an eyeglass lens according to one embodiment of the present invention.

[0054] FIG. 1b is a rear view showing an eyeglass lens according to one embodiment of the present invention.

[0055] FIG. 2a is a front view showing an eyeglass lens according to another embodiment of the present invention.

[0056] Figure 2b is a partial schematic front view of the glasses after the glasses lens of Figure 2a has been frame-cut and inserted into a loose-type frame.

[0057] FIG. 2c is a partial schematic front view of the glasses after the glasses lens of FIG. 2a has been frame-cut and inserted into a half-rim type frame.

[0058] FIG. 3a is a front view showing an eyeglass lens according to another embodiment of the present invention.

[0059] Figure 3b is a partial schematic front view of the glasses after the glasses lens of Figure 3a has been frame-cut and inserted into a half-rim type frame.

[0060] FIG. 4 is a front view showing an eyeglass lens according to another embodiment of the present invention.

[0061] FIG. 5 is a front view showing an eyeglass lens according to another embodiment of the present invention.

[0062] FIG. 6 is a front view showing an eyeglass lens according to another embodiment of the present invention.

[0063] In this specification, unless specifically mentioned otherwise, the situation is discussed when a third party looks at a person wearing glasses from the front.

[0064] In this specification, the side of the optical center of the spectacle lens is referred to as the inner side, and the side of the outermost edge of the spectacle lens is referred to as the outer side. In this specification, examples are given in which the optical center is aligned with the geometric center and the internal center.

[0065] Since then, the optical center is also called the lens center.

[0066] In the case of a frame-cut lens, the side of the frame center is referred to as the inner side, and the side of the outermost edge of the lens is referred to as the outer side. The outline of the outermost edge of the lens matches the outline of the lens shape (5) of the eyeglass lens (1) before the frame cut. As the name suggests, the frame center is the center position of the lens (i.e., the area inside the rim) when a third party looks at the eyeglasses being worn from the front.

[0067] The center position of the ray lens may be the geometric center of a rectangle (boxing) that circumscribes the ray lens and encloses it. The frame center may coincide with the optical center and the center of depth.

[0068] Subsequent regulations regarding eyeglass lenses that use the expression "lens center" may be applied by substituting "lens center" with "frame center" in the case of eyeglasses in which a frame-cut lens is fitted into a frame.

[0069] The eyeglass lens according to the present embodiment is

[0070] A lens substrate having an optical surface, and

[0071] The above-mentioned lens substrate is provided with an anti-reflection film covering the optical surface of the above-mentioned lens substrate, and

[0072] The above anti-reflection film has a multilayer structure including a stack of a low-refractive-index layer and a high-refractive-index layer,

[0073] The above anti-reflection film includes a reactive layer having a relatively higher reactivity to irradiation with an ultrashort pulse laser than other layers included in the anti-reflection film, and

[0074] In a removal site formed by at least partially removing a predetermined layer including the outermost layer of the above multilayer structure, the high refractive index layer located on the lower side of the reaction layer, or the partially remaining reaction layer, is exposed, thereby allowing the removal site to be visible by visible light, and the marking (or patterning, hereinafter collectively referred to as marking) (2M) is provided in the shape of jade, so that the removal site can be seen by visible light.

[0075] It is an eyeglass lens.

[0076] In addition, by arranging the above marking (2M) in the shape of jade, it also constitutes a method for manufacturing an eyeglass lens according to the present embodiment.

[0077] Specific examples, suitable examples, and modified examples of the lens substrate and anti-reflective film among the above descriptions will be described later in <One Specific Example of the Present Embodiment>, and below, the marking (2M), which is one of the major features of the present embodiment, will be described.

[0078] In this embodiment, a marking is formed by partially removing the anti-reflective film. This marking (2M) is a cut lens-like shape. This "cut lens-like shape" may or may not be a cut lens shape (5) predetermined for any one of the eyeglass lenses before processing. In this specification, "cut lens-like shape" refers to the shape of the eyeglass lens as seen from the front, which can be used as a cut lens shape. Specifically, the cut lens shape is mainly composed of an arc (concave shape toward the center of the lens) and / or a straight line. If the predetermined cut lens shape is a complex shape, a curve other than an arc may be used to match that cut lens shape. In other words, a one-point mark (logo or house mark) is excluded from this "cut lens-like marking (2M)." Additionally, numbers, letters, etc., such as manufacturing numbers are also excluded. Furthermore, these letters, numbers, and one-point marks may be provided on the eyeglass lens of this embodiment as an embellishment pattern (3) (described later) different from the marking (2M).

[0079] Additionally, the lens shape marking (2M) may be formed as a band-shaped area of ​​a predetermined width near the outer edge, following the shape of the outer edge of the lens after the frame cut. As described later, it may also be formed along a part of the outer edge of the lens after the frame cut. In that case, it may be formed as a band-shaped area having a desired width and length as described later.

[0080] When the shape of the lens (5) is determined for any one of the eyeglass lenses before processing, the marking (2M) of the lens shape may be referred to as a "line border (2M)" for the lens shape (5). That is, in this embodiment, it can be said that the line border (2M) is marked on the eyeglass lens before processing.

[0081] Each feature of the overhead line (2M) described later corresponds to the marking (2M) above. For convenience of explanation, the overhead line (2M) will be used as the main example for explanation.

[0082] In this specification, the term "line border (2M)" is, as its name suggests, a line that borders the outline of the jade shape (5) at the planned cutting location. The line border (2M) may be a shape similar to the outline of the jade shape (5).

[0083] However, this "similar" does not have to have strictly identical dimensional ratios. This is because, since the jade-shaped lens is generally not a perfect circle and has different widths in the vertical and horizontal directions, when simply enlarged or reduced, the distance between the outline of the jade-shaped shape (5) and the guide line (2M) differs, for example, in the upward and left directions. Therefore, the guide line (2M) may be a similar shape to the outline of the jade-shaped shape (5), but with some modifications applied so that the difference in distance between the outline of the jade-shaped shape (5) and the guide line (2M) is about 10%.

[0084] In addition, the outline of the jade shape (5), which is the planned cutting location, may or may not be marked on the eyeglass lens. If the outline (2M) is marked to overlap with the outline of the jade shape (5), it naturally leads to the outline of the jade shape (5) being marked on the eyeglass lens. For example, if the width of the outline (2M) is increased in the eyeglass lens (1) according to the present embodiment, the outline (2M) protrudes from the rim shape (2) in the eyeglass lens (1A) after being inserted into the frame (2F) (Figs. 2a, 2b). On the other hand, the outline (2M) may be marked in a non-contact state with the jade shape (5) (to be more specific, non-contact with the jade shape (5) and also on the inside thereof) (Figs. 1a, 1b, 5, 6).

[0085] On the other hand, a guideline may be marked at a position that does not overlap with the outline of the jade shape (5) and is offset inward from the outline of the jade shape (5). However, as long as it is named a "guideline," it is better not to be too far from the outline of the jade shape (5). The distance (shortest distance) from the outline of the jade shape (5) to the guideline is preferably 3.0 mm or less, 2.0 mm, and 1.0 mm or less in that order.

[0086] In this specification, the “line border (2M)” is composed mainly of an arc and / or a straight line, just like the marking (2M). The line border (2M) may be a closed loop (loop shape) or an open loop (a state in which a part of the loop-shaped line border has been erased). An open loop may also be a state in which only a part of the line border is provided.

[0087] For a specific example of an open loop, marking of the outline line (2M) may be performed only on a part of the contour of the jade-shaped lens as described in FIG. 4. At that time, the number of places of the outline line (2M) may be, for example, four places (four corners) as described in FIG. 4, or other places.

[0088] The “line border (2M)” in this specification refers to a portion that is visible to the naked eye. For example, a closed loop constituting the line border (2M) is visible as a dashed line. The solid portion of this dashed line is formed by continuously performing dot-shaped processing by laser processing described later, thereby arranging in a line portion in which a part of the anti-reflection film is exposed in a line shape. The blank portion of the dashed line does not perform such exposure. Due to the difference in the processing state of the two, the line border (2M) in the shape of a dashed line is visible when viewing the eyeglass lens from the front. The “line border (2M)” in this specification refers to the line-shaped portion that is actually processed. Furthermore, in the case of the eyeglass lens (1) mounted on a frame, the line border (2M) is made visible by observing from the object surface side of the eyeglass lens (1).

[0089] For example, this is explained using Fig. 7.

[0090] Figure 7 is an explanatory diagram for illustrating an example of suitability of a wire frame based on Figure 4.

[0091] In FIG. 7, when the right horizontal direction is rotated counterclockwise as 0 degrees when viewed from the center of the lens of the eyeglass lens before processing, it is assumed in this specification that a fan-shaped area a with a rotation angle of 15 to 60 degrees has a line edge (2M) formed therein. Similarly, it is assumed in this specification that a fan-shaped area b with a rotation angle of 120 to 165 degrees, a fan-shaped area c with a rotation angle of 195 to 240 degrees, and a fan-shaped area d with a rotation angle of 300 to 345 degrees also have a line edge (2M) formed therein. The fan-shaped areas a to d all have a center angle of 45 degrees. Each center angle is expressed as a1 to d1.

[0092] That is, the “line of the wire (2M)” refers to a processed portion that continuously connects the two side edges of a single fan-shaped area centered on the lens center. In FIG. 7, there are multiple lines of the wire of the wire (2M) (a total of 4, corresponding to each of the fan-shaped areas a to d). When each line of the wire of the wire (2M) is extended, it can form a single closed loop-shaped line. Each line of the wire of the wire (2M) in FIG. 7 can also be described as a solid line portion in a dashed line.

[0093] That is, in the example of this paragraph, the line border (2M) is provided throughout the entire fan-shaped area where the sum of the central angles is 180 degrees (a1 + b1 + c1 + d1 = 45 degrees × 4).

[0094] In addition, the eyeglass lenses are equipped with hidden marks, allowing the left-right (horizontal) direction to be identified when mounted on a frame, and furthermore, the up-down (vertical) direction to be identified as well.

[0095] After defining the wire frame (2M) in this manner, in this embodiment, the wire frame (2M) may be provided throughout the entire fan-shaped area in which the total center angle of the entire eyeglass lens is 60 degrees or more (preferably 90 degrees or more, 120 degrees or more, 150 degrees or more, 180 degrees or more, 210 degrees or more, 240 degrees or more, 270 degrees or more, 300 degrees or more, 330 degrees or more).

[0096] The line border (2M) may be the solid line portion of the dashed line described above, the solid line itself, or the solid line portion of the dotted line (e.g., a dot in laser processing). The number of lines may be single or multiple (see FIG. 5). If the number of lines is multiple, the thickness of the lines may be changed. In addition, different types of lines may be mixed as described above. Also, as shown in FIG. 6, a grid-shaped line border (hereinafter referred to as a checker shape) may be provided in which the solid line portion of the dashed line and the blank portion are arranged alternately in a vertical direction.

[0097] As for the specific value of the width of the overhead line (2M) (in cases where the overhead line is composed of multiple lines, the minimum width at the outermost point of the outermost line and the innermost point of the innermost line), for example, the minimum width of the line may be 1.0 mm or more. There is no limit to the maximum width, but for example, it may be 3.0 mm or less.

[0098] By adopting the above configuration, the following advantageous effects are achieved.

[0099] In other words, this improves the aesthetic appeal of the eyeglass lens (1A) after the lens shape processing (after the frame is inserted). In addition to the advantage of maintaining the strength of the eyeglasses, the rim has the utility of accentuating the contour of the lens shape, thereby making the wearer's face look more attractive. Furthermore, by adopting the above configuration, the rim line functions as a pseudo-rim, so to speak, and even in rimless eyeglasses, the contour of the lens shape can be emphasized to improve the aesthetics.

[0100] In other words, it is possible to obtain glasses with a replacement rim that eliminates the limitations of weight or field of view caused by the existing rim while maintaining the external function of the rim.

[0101] Alternatively, it is also possible to apply it as a cautious doctor lim with a smaller presence than the existing lim.

[0102] In addition, if the above configuration is applied together with an existing rim, it is possible to change the texture of the rim to emphasize its presence, and other applications are possible.

[0103] The degree of emphasis can be appropriately selected depending on the dimensions (thickness) of the pseudo-rim.

[0104] The above advantageous effect is also achieved for eyeglasses equipped with a frame and an eyeglass lens marked with a line marking that encircles the outer edge. Additionally, the type of rim of the frame may be rimless or half-rim, and the line marking may be marked as a pseudo-rim at least in the rimless area (Figs. 2a, 3a, 3b).

[0105] In addition, the following advantageous effects are also obtained.

[0106] Conventionally, if a defect exists in an eyeglass lens prior to mold processing, it was impossible to determine whether such a defect was present within the lens until after the process was completed. Consequently, to ensure safety, all defective eyeglass lenses are discarded before mold processing.

[0107] On the other hand, in the case of the eyeglass lens according to the present embodiment, a wire border (2M) exists during the lens shape processing, and the eyeglass lens is discarded only when there is a defect on the inner side of the wire border (2M). As a result, it becomes possible to save eyeglass lenses that would have conventionally been discarded.

[0108] <One specific example of the present embodiment>

[0109] The spectacle lens according to the present embodiment has, as optical surfaces, a surface on the object side and a surface on the eyeball side.

[0110] The "object-side surface" (object surface) is the surface located on the object side when eyeglasses equipped with lenses are worn by a wearer. The "eye-side surface" (eye surface) is the opposite; that is, the surface located on the eye side when eyeglasses equipped with lenses are worn by a wearer. Generally, the object-side surface is convex and the eye-side surface is concave—meaning eyeglass lenses are typically meniscus lenses. This also applies to eyeglass lenses after shaping (post-processing lenses).

[0111] FIG. 8 is a front view showing an example of processing an eyeglass lens according to the present embodiment.

[0112] In this embodiment, for an eyeglass lens (1) that is circular in shape when viewed from the front (e.g., outer diameter φ60~80mm), an optician shape processing (frame cut processing) is performed to cut the outer shape of the lens to match the rim shape (2) of the eyeglass frame worn by the wearer.

[0113] In this embodiment, prior to the shape processing, marking of the wire frame (2M) is performed on the eyeglass lens.

[0114] In addition, in this embodiment, an example is given of a case where a decorative pattern (3) is marked on the optical surface to display a one-point mark, such as a logo or house mark, a character, a symbol, a pattern, etc., so as to be located within the lens area after the frame cut.

[0115] In this specification, the “decorative pattern (3)” refers to a pattern different from the decorative line (2M). In this embodiment, both are produced with the same work content.

[0116] The above decorative pattern may be provided on the inner side of the above decorative line, at the end of the jade-shaped shape (5) (for example, at least one of the four corners). In addition to the decorative line according to the present embodiment functioning as a pseudo-rim, the decorative pattern (3) is provided on the end, so that the decorative pattern (3) becomes a good accent, further enhancing the aesthetics.

[0117] As part of the definition of the above step, for example, at least a portion of the decorative pattern (3) may be present on the outer side of the inscribed circle centered on the frame center (or the lens center in the case of an eyeglass lens before processing) in the shape lens.

[0118] In other words, at least a portion of the decorative pattern (3) may be present on the outer side of the inner circle of the marking (2M) as the inner side of the marking (2M).

[0119] Figure 9 shows this appearance.

[0120] FIG. 9 is a drawing showing a specific example in which the decorative pattern is provided on the end (e.g., at least one of the four corners) of the jade-shaped shape (5) as an inner side of the decorative line, based on FIG. 1a.

[0121] If it is Fig. 9, at least the character "HOY" in the decorative pattern (3) exists outside the inscribed circle (the dotted line in the drawing).

[0122] Marking can be performed, for example, using laser irradiation processing that allows for precise control of the irradiation position based on digital data; however, it is undesirable for the marking to cause a degradation in lens quality or function. Accordingly, in this embodiment, the marking of the decorative line (2M) and the decorative pattern (3) is performed by the processing procedure described below.

[0123] [1] Method for manufacturing eyeglass lenses

[0124] Here, the processing procedure of an eyeglass lens including the marking of the framing line (2M) and the framing pattern (3), that is, the procedure of the method for manufacturing an eyeglass lens according to the present embodiment, will be explained in detail.

[0125] FIG. 10 is a flowchart illustrating an example of a procedure for manufacturing an eyeglass lens according to the present embodiment.

[0126] In the manufacture of eyeglass lenses, first, an optical material, which is a lens material, is prepared, and a polishing treatment is performed on the lens material according to the prescription information of the eyeglass wearer, and a dyeing treatment is performed as necessary (Step 101, hereinafter the step is abbreviated as “S”).

[0127] For the lens substrate, a resin material with a refractive index (nD) of approximately 1.50 to 1.74 is used. Specifically, examples of resin materials include aryl diglycol carbonate, urethane-based resin, polycarbonate, thiourethane-based resin, and episulfide resin. However, it may be composed of other resin materials that obtain the desired refractive index, or it may be composed of inorganic glass. Furthermore, the lens substrate has optical surfaces on both the object-side and eye-side surfaces to form a predetermined lens shape. The predetermined lens shape may be a single-focus lens, a multifocal lens, or a progressive lens; in any of these cases, each optical surface is formed by a curved surface determined based on the eyeglass wearer's prescription information. The optical surfaces are formed, for example, by polishing, but they may also be cast (molded) products that do not require polishing.

[0128] In addition, polishing and dyeing treatments for the lens substrate may be performed using known techniques, and a detailed explanation thereof is omitted here.

[0129] Next, a hard coat film (HC film) is formed on at least one optical surface of the lens substrate, preferably on both optical surfaces (S102).

[0130] The HC film is composed of, for example, a curable material containing a silicon compound, and is a film formed with a thickness of about 3 μm to 4 μm. The refractive index (nD) of the HC film is close to the refractive index of the lens substrate material described above, for example, about 1.49 to 1.74, and the film composition is selected according to the lens substrate material. By coating with such an HC film, it is possible to improve the durability of the eyeglass lens.

[0131] The formation of the HC film can be carried out, for example, by a dipping method using a solution in which a curable material containing a silicon compound is dissolved.

[0132] After the HC membrane is installed, a reflection-preventing membrane (AR membrane) is subsequently installed so as to overlap the HC membrane (S103).

[0133] An AR film is a film that prevents light reflection through interference, having a multilayer structure in which films with different refractive indices are stacked. Specifically, an AR film is composed of a multilayer structure in which a low-refractive-index layer and a high-refractive-index layer are stacked. The low-refractive-index layer is, for example, made of silicon dioxide (SiO2) with a refractive index of approximately 1.43 to 1.47.

[0134] In addition, the high-refractive-index layer is composed of a material having a higher refractive index than the low-refractive-index layer, and is composed using, for example, zirconium oxide (ZrO2), tin oxide (SnO2), niobium oxide (Nb2O5), tantalum oxide (Ta2O5), titanium oxide (TiO2), yttrium oxide (Y2O3), aluminum oxide (Al2O3), or mixtures thereof (e.g., indium tin oxide (ITO)).

[0135] Among these, the high-refractive index layer containing Sn and O functions as a reactive layer because its reactivity to the ultrashort pulse laser described later is greater than that of other layers. Specifically, the above-mentioned SnO2 or ITO corresponds to this.

[0136] In this specification, the term "reaction layer" refers to a layer that has low excitation energy when subjected to laser irradiation. In one embodiment of the present invention, an ultrashort pulse laser is irradiated. Then, the SnO2 layer that can serve as the reaction layer has very low excitation energy due to multiphoton absorption (e.g., two-photon absorption) and is highly reactive. This is also true for the ITO layer, and the ITO layer can also serve as the reaction layer in this specification.

[0137] As a result, in one embodiment of the present invention, at least a portion of this SnO2 layer (or ITO layer) is sublimated or evaporated and, together with the SiO2 layer on the upper side, is lost from the irradiation site. In one embodiment of the present invention, the reaction layer, which is relatively more reactive than other layers included in the multilayer structure, refers to the SnO2 layer or the ITO layer. This reaction layer may be set as the reaction layer with the highest reactivity compared to other layers included in the multilayer structure.

[0138] In addition, the outermost layer of the multilayer AR film is configured to be a low-refractive-index layer (e.g., a SiO2 layer). By coating with such an AR film, the pattern formed by laser processing in this embodiment can achieve improved visibility due to the difference in reflectivity of visible light generated by irradiation with illumination light.

[0139] In addition, it is preferable that the bottom layer (substrate side) of the multilayer structure is also a low refractive index layer (e.g., SiO2 layer).

[0140] The formation of the AR film can be carried out, for example, by applying ion-assisted deposition.

[0141] A water-repellent film may be formed on the low-refractive-index layer, which is the outermost layer of the AR film. The water-repellent film may be referred to as an anti-fouling film. Additionally, the formation of the water-repellent film may be performed before or after the marking according to the present embodiment.

[0142] A water-repellent film is a film that imparts water repellency to a surface, and can be formed, for example, by applying a solution of a fluorine-based compound such as methaxylene hexafluoride.

[0143] The formation of the water-repellent film can be carried out, for example, by applying ion-assisted deposition, just as in the case of the AR film.

[0144] Furthermore, it does not matter if other functional layers are deposited on the AR film. Whether such functional layers contain metal components or not is not an issue, as long as the effect of precise processing by laser irradiation is obtained. Additionally, it does not matter whether such functional layers are uniform or scattered on the surface.

[0145] By undergoing the film formation treatment as described above, a thin film with a stacked structure as shown in Fig. 11 is formed on the optical surface of the lens substrate.

[0146] FIG. 11 is a side cross-sectional view showing an example of a stacked structure of a thin film according to the present embodiment.

[0147] The laminated structure of the drawing is configured such that an HC film (12), an AR film (13), and a water-repellent film (14) are laminated in sequence on the optical surface of the lens substrate (11). The AR film (13) has a multilayer structure in which a low-refractive-index layer SiO2 layer (13a), a high-refractive-index layer SnO2 layer (13b), and a ZrO2 layer (13c) are laminated, and the outermost layer (i.e., the outermost layer on the side of the water-repellent film (14)) is configured to be the SiO2 layer (13a).

[0148] Here, the SnO2 layer is a high-refractive-index layer and also a reaction layer.

[0149] After forming the thin film, the thin film is then marked on the spectacle lens on which the thin film is formed, as shown in FIG. 10, the frame cut process according to the contour of the lens shape (5), and the decorative pattern (3) are marked.

[0150] First, marking of the wire border (2M) is performed on the spectacle lens after thin film formation. In marking the wire border (2M), the lens height of the processing area (i.e., the three-dimensional shape of the processing area on the processing surface) is measured with respect to the processing surface of the spectacle lens to be processed (specifically, the optical surface on the side that is not blocked) while in a blocked state (S107). The measurement method is not particularly limited, but for example, it can be performed using a non-contact type three-dimensional measuring instrument.

[0151] The processing area is an area that includes the laser scanning area described below.

[0152] After measuring the lens height of the processing area, laser processing is performed by irradiating a laser beam onto the processing area, and a raster scan is performed to move the irradiation position of the laser beam based on pre-prepared pattern data (i.e., contour data of the lens shape (5)) (S108). It may be a vector scan instead of a raster scan. In addition, in this embodiment, before frame cut processing, marking of a line border (2M) is performed on the eyeglass lens based on the contour data of the frame shape.

[0153] If a decorative processing is performed after the frame cut (S104: after the cut), first, a jig blocking is performed by mounting one optical surface of the eyeglass lens to be processed (specifically, the optical surface on which the decorative processing described later has not been performed) onto a dedicated jig (S105). Then, the blocked eyeglass lens is set in an optics shape processing machine, and an optics shape processing (frame cut processing) is performed on the eyeglass lens, and the outer shape of the eyeglass lens is cut into a frame shape (S106). Since jig blocking and frame cut processing can be performed using known techniques, a detailed explanation is omitted here.

[0154] After the frame cut process, the decorative processing (i.e., marking of the decorative pattern) is performed. The details of the decorative processing, and furthermore the details of the laser processing for marking the decorative pattern, can be done in the same way as the marking of the decorative line (2M).

[0155] After marking the decorative pattern, jig deblocking is performed to detach the spectacle lens from the dedicated jig (S109), and lens cleaning is performed on the detached spectacle lens to remove any residue or attachments (foreign matter) from the marking process (S110). Then, the manufacturing of the spectacle lens is completed after a final lens appearance inspection (S111).

[0156] Meanwhile, for example, if a frame cut is performed after marking the framing line (2M) and after processing the decorative pattern (3) (S104: before cutting), then, as in S105, first, the jig blocking of the eyeglass lens to be processed is performed (S112). Then, regarding the surface to be processed of the eyeglass lens to be processed, the lens height of the processing area (i.e., the three-dimensional shape of the processing area on the surface to be processed) is measured (S113). The measurement method is the same as in the case where decorative processing is performed after the frame cut described above.

[0157] After measuring the lens height of the processing area, laser processing is performed by irradiating a laser beam onto the processing area, and a raster scan is performed to move the irradiation position of the laser beam based on pre-prepared pattern data (S114). A vector scan may be used instead of a raster scan. By doing so, a decorative pattern is marked on the processing area of ​​the workpiece surface of the eyeglass lens. Furthermore, details regarding the laser processing for marking the decorative pattern will be described later.

[0158] After marking the decorative pattern (3) and the decorative line (2M), frame cutting is performed on the eyeglass lens after the marking. That is, the blocked eyeglass lens is set in a mold processing machine, and mold processing (frame cutting) is performed on the eyeglass lens, and the outer shape of the eyeglass lens is cut into a frame shape (S115). After the frame cutting, jig deblocking is performed to remove the eyeglass lens from the dedicated jig (S116), and lens cleaning is performed on the removed eyeglass lens to remove residue or attachments (foreign matter) from the processing (S117). Then, the manufacturing of the eyeglass lens is completed after a final lens appearance inspection (S118).

[0159] [2] Details of laser processing

[0160] Next, the laser processing for marking the overhead line (2M) and the laser processing for marking the decorative pattern (3) will be explained in more detail.

[0161] In this embodiment, laser light is irradiated onto an AR film (13) covering the optical surface of a lens substrate (11), and by partially removing a predetermined layer including the outermost SiO2 layer (13a) of the AR film (13), marking of an illustrative pattern can be performed.

[0162] Specifically, when laser light transmitted through the outermost SiO2 layer reaches the SnO2 layer on the lower side, the SnO2 layer sublimates or evaporates due to the energy of the irradiation and disappears from the irradiation site along with the SiO2 layer on the upper side. That is, a predetermined layer including the outermost SiO2 layer (13a) is partially removed by laser processing that irradiates laser light. At this time, the irradiation site undergoes a removal process that exposes the high refractive index layer on the lower side, thereby allowing for the marking of an engraved pattern. The high refractive index layer exposed is, for example, a ZrO2 layer (13c).

[0163] As for the SnO2 layer (13b), it is possible to form it with a thin thickness (e.g., 3 to 20 nm, more preferably 3 to 10 nm). In this embodiment, it was made to 5 nm.

[0164] In addition, SnO2 in the above functions as a reactive layer that is most reactive to laser irradiation. It is preferable that this reactive layer contains Sn and O, and in addition to SnO2, ITO can be used.

[0165] In addition, in the above, SnO2 is removed by sublimation or evaporation, and ZrO2, which is a high-refractive-index layer located below it, is exposed at the irradiation site; however, the reaction layer does not necessarily need to be completely removed, and it is acceptable for a portion to remain at the irradiation site. For example, by laser irradiation, the reaction layer may be removed at least partially in the direction of the layer's thickness. In addition, as another example of partial removal, by laser irradiation, it is acceptable for a portion of the reaction layer to remain at the laser irradiation site not only in the direction of the layer's thickness but also when viewed from the direction of the laser irradiation (when viewed from the front). In the example of this paragraph, it is acceptable for ZrO2 to be exposed only partially. This is because, like ZrO2, SnO2 (or ITO) is also a high-refractive-index material, and even if ZrO2 is not fully exposed due to SnO2 when viewed from the front, there is no problem with visibility. Therefore, the high-refractive-index layer located on the lower side of the reaction layer, or the reaction layer that remains partially together with the high-refractive-index layer, may be exposed.

[0166] The phenomena occurring during laser irradiation are thought to be as follows. It is desirable that the reaction layer (such as SnO2 or ITO) be a conductive layer with higher conductivity than other layers included in the stacked structure.

[0167] According to the inventor's review, the reaction layer composed of SnO2 has a smaller energy corresponding to the band gap that generates excitement when subjected to laser irradiation under the conditions described below than the SiO2 layer on the upper side (outermost surface side) and the ZrO2 layer on the lower side. For this reason, compared to adjacent layers on the upper and lower sides, it is most likely to be lost most rapidly due to sublimation / evaporation.

[0168] At this time, it is thought that a phenomenon called so-called multiphoton absorption (e.g., two-photon absorption) occurs, and processing can be performed with very high energy efficiency. And, it is believed that SnO2 acting as a conductive layer is advantageous at this time.

[0169] Furthermore, regarding the concern that the ZrO2 on the lower side may be damaged by evaporation or dissolution due to the irradiation energy after the SnO2 is lost, it is possible to effectively remove only the reaction layer and the layer above it by controlling the irradiation conditions to utilize the delay until the stage of such damage occurrence. It has also been discovered that selecting the ultrashort pulse laser described later is advantageous for such precise processing control.

[0170] Here, we will briefly explain the laser processing device used for laser processing.

[0171] FIG. 12 is an explanatory diagram showing a schematic configuration example of a laser processing device used in the method for manufacturing eyeglass lenses according to the present embodiment.

[0172] The laser processing device used in this embodiment is configured to have a laser light source unit (21), an AOM (Acousto Optics Modulator) system unit (22), a beam shaper unit (23), a galvanometer scanner unit (24), and an optical system (25), as shown in FIG. 12 (a), and to irradiate laser light onto an AR film (13) through each of these units (21 to 25). In FIG. 12, the laser light source unit (21) is configured to emit an ultrashort pulse laser to emit laser light used for laser processing.

[0173] In the present embodiment, the lower limit of the pulse width of the ultrashort pulse laser is not particularly limited and may be greater than 0 femtosecond, but it is preferable that it be 0.01 picosecond (10 femtoseconds) or longer, and using a value of 0.1 picosecond or longer (including a value of 1 picosecond or longer) is advantageous in terms of device maintenance and cost, and is suitable for commercial use.

[0174] For example, a pulse width of 0.01 picoseconds (10 femtoseconds) or more and less than 100 picoseconds, preferably a pulse width of 0.01 picoseconds or more and less than 50 picoseconds, and more preferably a pulse width of 0.01 picoseconds or more and less than 15 picoseconds can also be used.

[0175] In addition, for example, a pulse width of 0.1 picoseconds or more and less than 100 picoseconds, preferably a pulse width of 0.1 picoseconds or more and less than 50 picoseconds, and more preferably a pulse width of 0.1 picoseconds or more and less than 15 picoseconds may be used.

[0176] In addition, pulse widths of 0.01 picoseconds or more and less than 1 picosecond (or less than 0.1 picoseconds) can also be used.

[0177] For the wavelength of the ultrashort pulse laser, in addition to, for example, 355 nm THG (Third Harmonic Generation) or 532 nm SHG (Second Harmonic Generation), a fundamental wavelength of 1064 nm can be used. For irradiation, the irradiation beam diameter can be selected according to the desired processing design. While it is effective to narrow the beam diameter to a small size to process fine designs with high resolution, shorter wavelengths are advantageous in this case; therefore, among the above wavelengths, 532 nm is preferred, and 355 nm is more preferred. Alternatively, 266 nm FHG (Fourth Harmonic Generation) is also acceptable.

[0178] The pulse energy of the ultrashort pulse laser is, for example, 0.1 μJ or more and 30 μJ or less (maximum about 60 μJ) at 50 kHz. The beam diameter of the ultrashort pulse laser is, for example, 10 μm or more and 30 μm or less.

[0179] According to the inventor's review, the following was found regarding the laser irradiation conditions.

[0180] (1) When the pulse width of the ultrashort pulse laser is less than 0.1 picoseconds

[0181] Good processing can be performed at any wavelength between 266 and 1064 nm. Shorter wavelengths are more advantageous for micro-processing. However, the production load is high in terms of equipment maintenance and cost.

[0182] (2) When the pulse width of the ultrashort pulse laser is 0.1 picoseconds or more and less than 1 picosecond

[0183] Good processing can be performed at any wavelength between 266 and 1064 nm. Shorter wavelengths are more advantageous for micro-processing.

[0184] (3) When the pulse width of the ultrashort pulse laser is 1 picosecond or more and less than 100 picoseconds

[0185] Good processing can be performed at any wavelength between 266 and 1064 nm. Shorter wavelengths are more advantageous for micro-processing. It is suitable in terms of equipment maintenance, cost, and stability of production conditions.

[0186] (4) When the pulse width of the ultrashort pulse laser is 100 picoseconds or more and less than 1 nanosecond

[0187] Non-uniformity in processing stability occurs depending on the applied wavelength. For example, if 266 nm on the short wavelength side is used as the applied wavelength, damage to the lower layer is likely to occur along with the reaction of SnO2. In addition, even at 355 nm, the uniformity of processing is lost due to slight variations in irradiation conditions, and it is not possible to prevent the phenomenon where the removal processing reaches the lower layer side below SnO2.

[0188] (5) When the pulse width of the ultrashort pulse laser is 1 nanosecond or longer

[0189] SnO2 And it is not possible to perform processing to selectively remove the layer on the surface side.

[0190] In the cases of (4) and (5) above, the visibility of the processed pattern is affected. For example, in the case of eyeglass lenses, there is a risk of interference with the wearer's field of vision. In addition, when observing the formed decorative pattern, depending on the lighting conditions, an incomplete visibility state is likely to occur where the pattern is not recognized by the observer.

[0191] To prevent the above-mentioned problems, it is important that the removal process using an ultrashort pulse laser is uniform in terms of processing diameter and processing depth. To achieve this, it is considered useful to control and utilize the duration of energy from irradiation and the delay of ablation of the underlying material by applying a predetermined ultrashort pulse width.

[0192] If such an ultrashort pulse laser can be emitted, the specific configuration of the laser light source (21) or the combination of wavelength and pulse width is not particularly limited.

[0193] The AOM system unit (22) suppresses excessive irradiation of laser light, which causes processing unevenness during laser processing, by canceling the beam output of the laser light immediately after the start of operation and immediately after the end of operation of the galvano scanner unit (24).

[0194] The beam shaper (23) can realize laser processing with a uniform energy distribution of laser light by converting the laser light from the laser light source (21) from a Gaussian energy distribution to a top hat energy distribution.

[0195] In particular, by applying a top-hat type distribution, stable and uniform processing can be performed when attempting to form a processing area of ​​a predetermined size by partially overlapping multiple beam spots. This is because the localized excess energy addition caused by the overlap of spots is suppressed.

[0196] The galvanometer scanner unit (24) enables scanning by the laser light by moving the irradiation position of the laser light from the laser light source unit (21) in two dimensions or three dimensions, thereby enabling the marking of a desired pattern to be performed by laser processing. In addition, the scanning range of the laser light by the galvanometer scanner unit (24) (i.e., the maximum laser processing area) (4) is set to a size and shape that can completely encompass the outer shape of the eyeglass lens to be processed (see FIG. 8).

[0197] The optical system (25) is configured by combining optical lenses such as telecentric lenses or mirrors, and guides the laser light from the laser light source (21) so that the laser light reaches the part to be processed of the eyeglass lens.

[0198] In addition, the laser processing device used in this embodiment is configured to allow the irradiation of laser light (i.e., ultrashort pulse laser) onto the AR film (13) via an optical system (25), as shown in FIG. 12 (b), to be performed with a defocus setting. A defocus setting means that the focal position (F) of the laser light being irradiated is set so that it is separated from the surface of the AR film (13), which is the workpiece to be processed by the laser light, by a predetermined defocus distance. When laser light is irradiated with such a defocus setting, the beam energy can be dispersed from the surface of the AR film (13) to which the laser light is irradiated, thereby making it possible to perform uniform film removal processing. This is particularly useful in cases where there may be variations in the height of the workpiece due to the influence of the surface shape of the AR film (13). However, it is not necessarily limited to a defocus setting, and for example, it is acceptable to perform laser light irradiation with a focus setting in which the focus position (F) coincides with the surface of the AR film (13), or with an infocus setting in which the focus position (F) is farther away from the defocus setting.

[0199] Next, the procedure for laser processing performed using a laser processing device configured as described above will be explained.

[0200] 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 AR film (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 eye side, but here, for example, the surface on the eye side is used as the surface to be processed.

[0201] After the eyeglass lens set, the laser light source unit (21) and the galvanometer scanner unit (24) are operated based on pre-prepared pattern data (i.e., pattern data of a predetermined resolution created based on the decorative pattern to be obtained). By doing so, an ultrashort pulse laser is irradiated onto the processing area of ​​the eyeglass lens's processing surface in a pattern shape corresponding to the decorative pattern.

[0202] When an ultrashort pulse laser is irradiated, the ultrashort pulse laser passes through the water-repellent film (14) on the workpiece surface of the eyeglass lens and reaches the AR film (13) on the workpiece surface. When the ultrashort pulse laser reaches, non-thermal processing is performed on the AR film (13) by the ultrashort pulse laser.

[0203] The ablation processing of the present embodiment is a technology capable of performing high energy-efficient processing through the multiphoton absorption phenomenon of an ultrashort pulse laser. More specifically, it is a removal processing performed by suppressing the thermal influence around the processing site as much as possible, and causing the laser beam irradiated site to instantaneously melt, evaporate, or sublimate and scatter. With this non-thermal processing, since highly reactive materials are instantaneously removed from the irradiated site, the thermal influence on the surrounding area is minimal, allowing for processing that suppresses thermal damage (such as deformation caused by heat).

[0204] Laser processing according to the present embodiment can be performed as ablation processing as a non-thermal processing. This processing can induce a multiphoton absorption process (e.g., a two-photon absorption process) that brings about the multiphoton absorption phenomenon described above. Therefore, even for materials that are relatively transparent (high transmittance) to the laser, efficient processing can be performed through multiphoton absorption. In this case, the range of applicable laser wavelengths is wide, and as the wavelength of the laser light, 1064 nm can be advantageously used in addition to 355 nm (THG) and 532 nm (SHG).

[0205] And as explained above, in order to induce the multiphoton absorption, a picosecond laser or a femtosecond laser with a short pulse width is advantageous. As for specific values, for example, the pulse width can be less than 100 picoseconds, preferably less than 50 picoseconds, and more preferably less than 1 picosecond (i.e., femtosecond).

[0206] When non-thermal processing is performed by irradiation with an ultrashort pulse laser, the reaction layer (SnO2 in this embodiment) in the AR film (13) is removed as the reaction layer instantaneously reacts and sublimates / evaporates, passing through the SiO2 in the multilayer structure constituting the AR film (13). In this way, only a predetermined layer, including a differential surface layer of the anti-reflection film, is partially removed in a pattern shape corresponding to the decorative pattern. Additionally, the corresponding portion of the water-repellent film (14) is also removed in conjunction with this. As a result, the ZrO2 layer (13c) located on the lower side of the SnO2 layer (13b) is exposed at the irradiation site.

[0207] By performing laser processing as described above, a predetermined layer including the SiO2 layer (13a), which is the outermost layer of the AR film (13), is partially removed (a removal site is formed), and the ZrO2 layer (13c) as a high refractive index layer is exposed, thereby allowing a decorative pattern to be marked on the surface to be processed of the eyeglass lens.

[0208] As described above, the irradiated area where a predetermined laser irradiation is performed is partially processed within the workpiece surface.

[0209] The transmittance of visible light (wavelength 380 nm to 780 nm) of the wire border (2M) and the decorative pattern (3) can be 80% or more, for example, 80% to 95%, or 80% to 90%, or 80% to 85%. In addition, the value obtained by subtracting the transmittance of visible light in a region other than the two from the transmittance of visible light (wavelength 380 nm to 780 nm) of the wire border (2M) and the decorative pattern (3) is 20% or less, 15% or less, or 10% or less. With this configuration, even if the two enter the wearer's field of vision, they are less likely to interfere with the field of vision, and a wide and bright field of vision is obtained.

[0210] [3] Composition of eyeglass lenses

[0211] Next, the composition of the spectacle lens obtained by the manufacturing method of the procedure described above, that is, the composition of the spectacle lens according to the present embodiment, will be explained in detail.

[0212] FIG. 13 (a) is an explanatory diagram showing an example of the main part configuration of an eyeglass lens according to the present embodiment.

[0213] Figure 13(b) shows one specific example of the results of an electron microscope observation of a cross-section of an AR film (13). The example in the drawing is an enlarged view of parts A and B in Figure 13(a), showing electron microscope images of a laser scan area (16) and an unprocessed area (15).

[0214] As shown in FIG. 13(a), the eyeglass lens according to the present embodiment is configured such that an HC film (12), an AR film (13), and a water-repellent film (14) are stacked in sequence on the optical surface of the lens substrate (11). The AR film (13) has a multilayer structure in which a low refractive index layer, a SiO2 layer (13a), a high refractive index layer, a SnO2 layer (13b), and a ZrO2 layer (13c) are stacked. A predetermined layer (specifically, a reaction layer, a SnO2 layer, and a layer on the surface side therefrom) containing the SiO2 layer (13a), which is the outermost layer of the multilayer structure, is partially removed so that the high refractive index layer, a ZrO2 layer (13c), is exposed. That is, the eyeglass lens according to the present embodiment is configured to have an unprocessed area (15) in which the optical surface of the lens substrate (11) is covered by an HC film (12), an AR film (13), and a water-repellent film (14), and a laser scan area (patterned area) (16) in which the outermost SiO2 layer (13a) of the AR film (13), the SnO2 layer (13b) immediately below it, and the water-repellent film (14) are partially removed to expose a ZrO2 layer (13cb), which is a high refractive index layer.

[0215] In the non-processed area (15) and the laser scan area (16), one side is covered with a SiO2 layer (13a) and the other side has a ZrO2 layer (13c) (or, if a reaction layer remains partially intact, the reaction layer, which is a high refractive index layer) exposed; therefore, the light reflectance in each side differs depending on the presence or absence of the SiO2 layer (13a). Consequently, when the state in which light is irradiated onto the eyeglass lens is viewed, the pattern shape formed by the laser scan area (16) can be seen. That is, if the laser scan area (16) is formed with a pattern shape corresponding to the decorative pattern, the decorative pattern can be seen. In this way, the removal location of a predetermined layer of the AR film (13) can be utilized as a component for constituting the decorative pattern.

[0216] It is desirable that the reflectance of the decorative line (2M) and the decorative pattern (3) be higher than the reflectance of the region other than the two. That is, the two may be formed by exposing a ZrO2 layer (13c), which is a high refractive index layer.

[0217] The laser scan area (16) constituting the decorative pattern is formed by removing the SiO2 layer (13a), which is the outermost layer of the AR film (13), and the SnO2 layer (13b), which is the layer immediately below it. That is, the target for removal remains in a predetermined layer containing SnO2, which is the reaction layer. Therefore, for each layer of the multilayer structure constituting the AR film (13), peeling caused by the formation of the laser scan area (16) can be suppressed.

[0218] The removal of the SiO2 layer (13a), which is the outermost layer of the AR film (13), can be achieved by non-thermal processing using irradiation with an ultrashort pulse laser, as previously explained. With such non-thermal processing, the thermal influence on the area around the processing site is reduced, thereby suppressing thermal damage. In addition, by applying the above-mentioned predetermined pulse width, stable processing can be performed while suppressing damage to the lower layer side of the reaction layer. This exposes the ZrO2 layer (13c) as a high refractive index layer, but it is possible to suppress damage to the exposed surface of the ZrO2 layer (13c).

[0219] If damage to the exposed surface of the ZrO2 layer (13c) can be suppressed, then the reduction in film thickness associated with the removal process of the ZrO2 layer (13c) can also be suppressed. The film thickness of the SiO2 layer (13a), SnO2 layer (13b), ZrO2 layer (13c), etc., can be determined by acquiring an electron microscope image of the cross-section of the AR film (13) and analyzing the acquired image.

[0220] FIG. 13(b) shows a specific example of the results of an electron microscope observation of a cross-section of an AR film (13). The example in the drawing is an enlarged view of parts A and B in FIG. 13(a), showing electron microscope images of a laser scan area (16) and an unprocessed area (15). In addition, in the unprocessed area (15), a SiO2 layer (13a), a SnO2 layer (13b), and a ZrO2 layer (13c) are stacked, but because the SnO2 layer (13b) has a thin thickness (for example, about 5 nm), it is difficult to recognize in the image. On the other hand, in the laser scan area (16), the SnO2 layer (13b) and the SiO2 on the surface side therefrom are removed, and the ZrO2 layer (13c) is exposed.

[0221] According to the electron microscope image of the drawing example, in the ZrO2 layer (13c) exposed by removing SnO2 and the layer on the surface side therefrom, it can be seen that there is no significant difference between the thickness t1 of the laser scan area (16) and the thickness t2 of the non-processed area (15). More specifically, the ratio t1 / t2 of the thickness t1 of the removed area and the thickness t2 of the non-removed area is set to be, for example, within a range of 0.90 or more and 1.00 or less, preferably within a range of 0.95 or more and 1.00 or less, and more preferably within a range of 0.99 or more and 1.00 or less.

[0222] In this way, in the exposed high-refractive-index ZrO2 layer (13c), the reduction in film thickness associated with removal processing does not occur, or even if a reduction occurs, the amount of reduction is suppressed to be very small. This is because the laser scan area (16) is formed by non-thermal processing by irradiation with an ultrashort pulse laser, and no damage occurs to the lower ZrO2 layer (13c). This means that if the ratio t1 / t2 of the thickness of the exposed ZrO2 layer (13c) falls within the range described above, the laser scan area (16) is formed without damage to the ZrO2 layer (13c), and it can be presumed that the formation of the laser scan area (16) was performed using non-thermal processing by an ultrashort pulse laser.

[0223] The reason why no damage occurs to the ZrO2 layer (13c) is that the reactivity of the reaction layer (here, SnO2 layer) by the ultrashort pulse laser is higher than that of ZnO2. And, as described later, this difference in reactivity is significantly achieved by applying an ultrashort pulse laser of a predetermined pulse width.

[0224] In addition, regarding the SnO2 layer, since the thickness of the ZrO2 layer is 10 times or more, preferably 15 times or more, even if the ZrO2 layer is slightly reduced after the SnO2 layer is lost, there is no risk of film peeling or any effect on the visibility of the decorative pattern.

[0225] In addition, the melting point of SnO2 is about 1127°C, which is lower than that of SiO2 on the upper side and ZrO2 on the lower side, and it is thought that this also contributes to the ease of controlling ablation.

[0226] According to the eyeglass lens configured as described above, even if an edible pattern is marked, peeling of each layer constituting the multilayer AR film (13) can be suppressed, and damage to the exposed ZrO2 layer (13c) can be prevented. Therefore, even when applied to an eyeglass lens product, it is possible to mark an edible pattern on the eyeglass lens without causing a decrease in the quality of the product.

[0227] [4] Effects of the present embodiment

[0228] According to the present embodiment, first, the following advantages are exhibited.

[0229] One advantageous effect is that the design of the eyeglass lens (shaped lens) (1A) can be improved after the shape processing (after being fitted into the frame).

[0230] In addition, the following advantageous effects are also obtained.

[0231] In the case of an eyeglass lens according to the present embodiment, a wire edge (2M) exists during the lens shape processing, and the eyeglass lens is discarded only when there is a defect on the inner side of the wire edge (2M). As a result, it becomes possible to save eyeglass lenses that would have conventionally been discarded. This effect is achieved in the eyeglass lens according to the present embodiment and also in the method of manufacturing the eyeglass lens.

[0232] In the method for manufacturing an eyeglass lens according to the present embodiment, there is also an advantage that when providing one-point markings such as a logo or house mark, the marking can be performed collectively together with the guide line (2M).

[0233] More specifically, one or more effects as shown below are obtained.

[0234] (a) In this embodiment, regarding the AR film (13), which is one of the thin films covering the optical surface of the lens substrate (11), the reaction layer (SnO2 in the above embodiment) and the layer on the surface side therefrom of the AR film (13) are partially removed, and by exposing the ZrO2 layer (13c), which is a high refractive index layer, a marking of an optics lens is performed.

[0235] (b) In this embodiment, non-thermal processing is performed by irradiating an ultrashort pulse laser to partially remove the reaction layer (SnO2 in the above embodiment) of the AR film (13) and the layer on the surface side therefrom, thereby exposing the ZrO2 layer (13c), which is a high refractive index layer, and thereby marking an optics lens with an engraving pattern. With this non-thermal processing, since the removal processing is performed by the effect of the pulse width rather than the effect of the absorbed energy of the laser light, it is possible to selectively and uniformly remove only a predetermined layer including the SiO2 layer (13a), which is the outermost layer of the AR film (13). Furthermore, since it is a non-thermal processing, it is possible to suppress thermal damage around the processing site, and thereby prevent damage to the exposed surface of the ZrO2 layer (13c) on the lower side of the reaction layer.

[0236] (c) As described above, in this embodiment, a predetermined layer including the outermost layer of the AR film (13) is removed using an ultrashort pulse laser, and a high refractive index layer is exposed, thereby making a marking of an optics lens with an optics pattern. Therefore, according to this embodiment, peeling of each layer of the AR film (13) can be suppressed, and damage to the exposed ZrO2 layer (13c) does not occur. Thus, even when applied to an optics lens product, it is possible to make a marking of an optics lens with an optics pattern without causing a decrease in the quality of the product.

[0237] (d) In the present embodiment, the pulse width of the ultrashort pulse laser may be greater than 0 femtosecond, but is preferably 0.01 picosecond (10 femtosecond) seconds or more and less than 100 picoseconds, and using a pulse width of 0.1 picosecond or more (including 1 picosecond or more) is advantageous in terms of device maintenance and cost and is suitable for commercial use.

[0238] More specifically, regarding laser irradiation conditions, depending on the pulse width, the following advantages exist.

[0239] (1) When the pulse width of the ultrashort pulse laser is less than 0.1 picoseconds

[0240] Good processing is achieved at any wavelength between 266 and 1064 nm. Shorter wavelengths are more advantageous for micro-processing. However, the production load is high in terms of equipment maintenance and cost.

[0241] (2) When the pulse width of the ultrashort pulse laser is 0.1 picoseconds or more and less than 1 picosecond

[0242] Good processing is achieved at any wavelength between 266 and 1064 nm. Shorter wavelengths are more advantageous for micro-processing.

[0243] (3) When the pulse width of the ultrashort pulse laser is 1 picosecond or more and less than 100 picoseconds

[0244] Good processing is achieved at any wavelength between 266 and 1064 nm. Shorter wavelengths are more advantageous for micro-processing. It is suitable in terms of equipment maintenance, cost, and stability of production conditions.

[0245] (e) In this embodiment, for non-thermal processing by irradiation with an ultrashort pulse laser, the irradiation of the ultrashort pulse laser onto the AR film (13) is performed with a defocus setting. When laser light is irradiated with such a defocus setting, the beam energy can be dispersed on the surface of the AR film (13) to which the laser light is irradiated, thereby making it possible to perform uniform film removal processing. This is particularly useful in cases where there may be variations in the height of the irradiated area due to the influence of the surface shape of the AR film (13).

[0246] (f) In this embodiment, non-thermal processing is performed by irradiating an ultrashort pulse laser under predetermined conditions, thereby suppressing damage to the exposed surface of the ZrO2 layer (13c) as a high refractive index layer that is exposed by removing SnO2 and the layer on the surface side therefrom. Specifically, the ratio t1 / t2 of the thickness t1 of the ZrO2 layer (13c) at the removal site and the thickness t2 of the ZrO2 layer (13c) at the non-removal site, such as the SiO2 layer (13a), is, for example, within the range of 0.90 or more and 1.00 or less, preferably within the range of 0.95 or more and 1.00 or less, more preferably within the range of 0.99 or more and 1.00 or less. In this way, the ZrO2 layer (13c) is suppressed so that no reduction in film thickness occurs during the removal process, or even if a reduction occurs, the amount of reduction is very small. Therefore, when applied to eyeglass lens products, it is highly desirable for marking decorative patterns on eyeglass lenses without causing a deterioration in the quality of the product.

[0247] [5] Variants, etc.

[0248] Although embodiments of the present invention have been described above, the above disclosures represent exemplary embodiments of the present invention. That is, the technical scope of the present invention is not limited to the exemplary embodiments described above, and various modifications are possible within the scope without departing from the gist thereof.

[0249] In the above-described embodiment, an example was given in which the marking of the wire border (2M) (and decorative pattern (3)) is performed by non-thermal processing using an ultrashort pulse laser, but the present invention is not limited thereto. That is, non-thermal processing using an ultrashort pulse laser is sufficient if it is for performing any patterning on the optical surface of an optical member, and it can be applied in exactly the same way to marking other than the wire border (2M) (and decorative pattern (3)).

[0250] In the above-described embodiment, the outermost layer of the AR film (13) is a SiO2 layer (13a) as a low refractive index layer, the layer below the SiO2 layer (13a) is a SnO2 layer (13b) as a reaction layer as a high refractive index layer, and the layer further below is a ZrO2 layer (13c) as a high refractive index layer. When SnO2 reacts and is partially removed by laser irradiation, SiO2 is also removed along with it, thereby exposing the ZrO2 layer (13c) as a high refractive index layer. However, the present invention is not limited to this. The AR film (13) may be composed of stacked layers other than the SiO2 layer (13a), SnO2 layer (13b), and ZrO2 layer (13c). Furthermore, the outermost layer of the AR film (13) may be a layer other than the SiO2 layer (13a) as long as it is a low refractive index layer. As the high refractive index layer, it may be something other than the SnO2 layer (13b) or the ZrO2 layer (13c). For example, regarding the SnO2 layer (13b) as the reaction layer, a thin ITO layer having conductivity may be used instead of the SnO2 layer (13b).

[0251] In the above-described embodiment, an example is given in which the SnO2 layer, which is a reaction layer included in the AR film (13), and the SiO2 layer (13a), which is the outermost layer immediately above it, are removed by non-thermal processing using an ultrashort pulse laser. By doing so, as previously explained, the effect of suppressing film peeling is achieved. In this way, non-thermal processing using an ultrashort pulse laser makes it possible to remove a predetermined number of layers including the outermost layer. Even when removing multiple layers including the outermost layer, non-thermal processing using an ultrashort pulse laser can suppress damage to the exposed surface of the layer exposed by removal, and thus can also suppress the reduction in film thickness associated with the removal process. That is, even when removing multiple layers including the outermost layer, for the layer immediately below the removed layer, the ratio t1 / t2 of the thickness t1 of the removed location and the thickness t2 of the non-removed location falls within, for example, a range of 0.90 or more and 1.00 or less, preferably within a range of 0.95 or more and 1.00 or less, and more preferably within a range of 0.99 or more and 1.00 or less.

[0252] In the present embodiment, the spectacle lens prior to laser processing may be provided with anti-reflective films on both sides. An example of such a spectacle lens is described in International Publication WO2020 / 067407. All of the contents of this publication are referenced in this specification. In particular, the spectacle lens of the configuration of Examples 1 and 2 described in this publication (if any one is cited, Example 1) may be adopted as an example. An example of the spectacle lens prior to modification in the present embodiment is as follows.

[0253] One specific example of an eyeglass lens is,

[0254] An eyeglass lens having multilayer films on both sides of a lens substrate,

[0255] The sum of the average reflectances in the wavelength band of 360 to 400 nm on each surface of the above-mentioned spectacle lens is 6.0% or less, and

[0256] The sum of the average reflectances in the wavelength band of 400 to 440 nm on each surface of the above-mentioned spectacle lens is 20.0% or more, and

[0257] The above-mentioned spectacle lens is a lens in which the sum of the average reflectances in the wavelength band of 480 to 680 nm on each surface of the spectacle lens is 2.0% or less.

[0258] That is, among the light in the blue region, particularly in the purple region (400–440 nm) that must be blocked, the sum of the average reflectances of each surface is set to 20.0% or more (preferably exceeding 20.0%, and more preferably 25.0% or more). That is, the reflectance is locally increased in the purple region.

[0259] Instead, in the low-wavelength side (360–400 nm) of the ultraviolet region to the violet region, the sum of the average reflectances of each surface is set to 6.0% or less (preferably less than 6.0%, more preferably 5.0% or less), and, contrary to the case of the violet region (400–440 nm), the reflectance is locally reduced.

[0260] In addition, in the high-wavelength to red region (480 to 680 nm) of the blue wavelength region, the sum of the average reflectances of each surface is set to 2.0% or less (preferably less than 2.0%, more preferably 1.5% or less), and the reflectance is particularly locally reduced in the main wavelength band of visible light so as to allow for the transmission of visible light.

[0261] In such a specific example, it is possible to secure a blocking effect for light in the blue region while also securing the transmission of visible light.

[0262] When laser processing according to the present embodiment is performed on the eyeglass lens of this embodiment, the following advantageous effects are produced. The eyeglass lens of this embodiment has a blocking effect against light in the blue region, that is, a high reflectivity of light in the blue region. Therefore, when the eyeglass lens (1) is viewed from a third party facing the front of the wearer of the eyeglass lens (1), the eyeglass lens appears blue. On the other hand, the area where laser processing is performed (decorative pattern (3)) appears as the color of the layer exposed by the laser processing (in this embodiment, yellow to gold or silver, which is the color of the ZrO2 layer). As a result, to a third party facing the front of the wearer of the eyeglass lens (1), the decorative pattern (3) appears to rise against a blue background on the eyeglass lens (1) embedded in the frame. In that case, a decorative pattern (3) with a high decorative effect is obtained. This is also true when the background is not blue, that is, when the reflectance of light in the blue region is not high, but the reflectance of light in other color regions is high. As an example of a background color, when the eyeglass lens (1) is viewed from a third party facing the front of the wearer of the eyeglass lens (1), the eyeglass lens (1) may be green or pearly.

[0263] The good contrast aspect of the above-mentioned decorative pattern (3) can be realized whether the laser processing is performed on each multilayer film on the object-side surface of the eyeglass lens or on each multilayer film on the eye-side surface.

[0264] In addition, even if laser processing is performed on each multilayer film of any surface, interference with the field of vision caused by the decorative pattern entering the wearer's field of vision does not substantially occur. That is, the eyeglass lens provided with the decorative pattern (3) of the present embodiment does not impede the wearer's clear field of vision.

[0265] Therefore, the portion forming the decorative border or decorative pattern of the present embodiment has a high transmittance for visible light as described above, and since the difference in transmittance with the portion without the decorative pattern is small, its existence is not substantially perceived even when it enters the wearer's field of vision.

[0266] For example, when the present embodiment is applied to rimless or half-rim glasses, the following advantages are obtained. That is, while applying rimless or half-rim glasses, it is conceivable to create a pseudo-rim by drawing a pseudo-rim near the outer edge of the lens with a coloring material such as a known pigment, or by forming irregularities on the lens surface. However, according to the pseudo-rim of the present embodiment formed by the laser irradiation described above, it is advantageous in that it is freed from the limitations experienced with rimmed glasses, namely the impression that the field of view is defined as a certain area, or the wearing sensation that the outer edge of the field of view feels dark due to the rim, and allows for a wide and bright field of view.

[0267] In addition, when observing the wearer's lens from another person (i.e., when observing the wearer's lens from the object surface side), the decorative pattern (3) is clearly visible when the wearer's lens is at a predetermined relative position (or angle) with respect to indoor lighting or sunlight, but it becomes difficult to see when it is not at the said relative position. Therefore, additional design value can be imparted to the lens through a change in visibility, such as the predetermined decorative pattern (3) appearing clearly or almost disappearing.

[0268] On the other hand, when there is no predetermined relative positional relationship as described above, it is perceived by others as a normal clear lens (or a predetermined colored lens, light-displaying lens, or polarizing lens). Therefore, there is no phenomenon that occurs with rimmed glasses, such as part of the wearer's face being obscured or shadows being cast by the rim, and it can be seen clearly.

[0269] The decorative pattern (3) of the present embodiment can be formed within the frame-cut lens area without affecting the function of the glasses, and can have a desired character, symbol, or pattern placed on the lens, or a desired design placed on the lens.

[0270] The decorative pattern (3) of the present embodiment is a process that can be seen from both the processing surface side and the back side of the lens. This is because, in the multilayer anti-reflection film, the designed anti-reflection performance is reduced in the removed area (in the present embodiment, SnO2 and SiO2 on the upper side thereof are removed), and a contrast in the amount of reflected light is obtained between the removed area and the non-removed area.

[0271] The present embodiment is characterized by the provision of a cross-line around the jade-shaped surface. Focusing on this point, it is not mandatory for the cross-line to be configured with a portion of the anti-reflective film exposed. From this perspective, the present embodiment can also be expressed as follows. It is acceptable to combine each configuration described so far with the following expression.

[0272] As an eyeglass lens before being cut into the shape of the frame when mounted,

[0273] A line marking that encircles the outline of the above jade shape, which is the planned cutting location, from the inside.

[0274] Eyeglass lenses.

[0275] "Equipped with eyeglass lenses and frames marked with a border line that encircles the outer edge

[0276] glasses." Explanation of the symbols

[0277] 1… (Eyeglass lens before mold processing) 1A… (After mold processing) Eyeglass lens (Molded lens) 2… Rim shape 2F… Frame 2M… Marking (Template) 3… Decoration Pattern 4… Injectable range 5… Jade-shaped form 11… Lens material (optical material) 12… HC film 13… AR film 13a… SiO2 layer (low refractive index layer) 13b… SnO2 layer (high refractive index layer) 13c… ZrO2 layer (high refractive index layer) 14… Water-repellent film 15… Unprocessed area 16… Laser scanning area (patterning area) 21… Laser light source 22… AOM System Division 23… Beam Shaper Division 24… Galvano-scanner section 25… Optical system

Claims

Claim 1 An eyeglass lens comprising a lens substrate having an optical surface and an anti-reflection film covering the optical surface of the lens substrate, wherein the anti-reflection film has a multilayer structure including a stack of a low refractive index layer and a high refractive index layer, wherein the anti-reflection film includes a reactive layer having a reactivity that is relatively higher than that of other layers included in the anti-reflection film, to the extent that it is sublimated or evaporated by irradiation with an ultrashort pulse laser, and wherein a mark is provided in the shape of a jade so that the removal site can be seen by visible light, by exposing the high refractive index layer located on the lower side of the reactive layer or the partially remaining reactive layer at a removal site formed by at least partially removing a predetermined layer including the outermost layer of the multilayer structure, and wherein the marking is formed as a band-shaped area of ​​a predetermined width near the outer edge along the shape of the outer edge of the lens after frame cutting. Claim 2 The eyeglass lens of claim 1, wherein the removal location also comprises an ornamental pattern other than the jade-shaped marking. Claim 3 In claim 2, the decorative pattern is an eyeglass lens provided on the inner end of the jade-shaped marking. Claim 4 An eyeglass lens according to any one of claims 1 to 3, wherein the jade-shaped marking is ring-shaped. Claim 5 A spectacle lens of the shape having a border line around the outer edge and a frame on which the spectacle lens of the shape is mounted are provided, wherein the spectacle lens comprises a lens substrate having an optical surface and an anti-reflective film covering the optical surface of the lens substrate, wherein the anti-reflective film has a multilayer structure including a stack of a low refractive index layer and a high refractive index layer, wherein the anti-reflective film includes a reaction layer having a reactivity that is relatively higher than that of other layers included in the anti-reflective film, to the extent that it sublimates or evaporates upon irradiation with an ultrashort pulse laser, and wherein a mark is provided as the border line such that the removal location can be seen by visible light by exposing the high refractive index layer located on the lower side of the reaction layer, or the partially remaining reaction layer, at a removal location formed by at least partially removing a predetermined layer including the outermost layer of the multilayer structure, and wherein the marking is formed as a band-shaped area of ​​a predetermined width near the outer edge along the shape of the outer edge of the lens after the frame cut, and the spectacle lens is the The glasses are mounted on a frame, and when observed from the object surface side of the lens, the above-mentioned outline is visible. Claim 6 In claim 5, the removal location comprises an ornamental pattern other than the above-mentioned line. Claim 7 In claim 6, the decorative pattern is a pair of glasses provided at the inner end of the decorative line. Claim 8 Glasses according to any one of claims 5 to 7, wherein the wire frame is ring-shaped. Claim 9 Glasses according to any one of claims 5 to 7, wherein the type of rim of the frame is rimless or half-rim, and the guide line is marked as a pseudo-rim at least at the location where the rim is not present.

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