Spectacle lens and spectacles

Abstract

Provided are: a spectacle lens (1) provided with a lens base material having an optical surface, and an antireflection film covering the optical surface of the lens base material, the antireflection film having a multilayer structure comprising a laminate of a low-refractive-index layer and a high-refractive-index layer, the antireflection film comprising a reaction layer, and the reaction layer being formed of a transparent conductive material; the reaction layer has a relatively high reactivity with respect to irradiation with an ultra-short pulse laser compared to other layers included in the antireflection film, and a high refractive index layer positioned on the lower layer side of the reaction layer or a partially remaining reaction layer is exposed at a removal site where a given layer including the outermost layer of the multilayer structure is at least partially removed. The eyeglasses lens is provided with a mark (2M) in the shape of a spherical lens, and the mark (2M) can visually recognize the removed part through visible light.

Description

Technical Field

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

[0002] The technology of applying color and design to the corresponding part of the spectacle lens in the spectacle frame (for example, see patent documents 1 and 2) is known. In this specification, the spectacle frame is also referred to as the frame, and the spectacle frame, in particular, the frame (the component into which the spectacle lens after spherical mirror processing is embedded) is described. The spectacle lens after spherical mirror processing is also called a spherical lens. The spherical mirror processing is also called frame cutting.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2004-004727

[0006] Patent Document 2: Japanese Patent Application Publication No. 2007-058146 Summary of the invention

[0007] Problems to be solved by the invention

[0008] At present, the raw materials of eyeglass lenses are basically plastic, and as a result of the improvement of raw materials, they have sufficient strength to resist breakage. Therefore, it is not necessary to use a frame to protect them. The frame including the frame will enter the wearer's field of vision. Therefore, there is a problem that the frame may be perceived as an unnecessary obstacle in the field of vision depending on the wearer. In addition, there is also a situation in which the weight of glasses is reduced.

[0009] In these cases, it is preferred to reduce the weight of the frame and the weight of the decorations relative to the glasses as much as possible. In view of the above situation, thin frames and lightweight frames have been developed. As an example of lightweight frames, frameless frames without frames and semi-frame frames with frames only in a part (e.g., the lower half) have been developed.

[0010] On the other hand, there are many people who find that they need glasses with frames. The inventors have conducted in-depth research on this need and found that the frames have the following advantages.

[0011] That is, it was found that, in addition to the advantage of maintaining the strength of the glasses, the frame also has the effect of making the outline of the spherical lens clear, thereby becoming a highlight in the wearer's appearance.

[0012] The object of the present invention is to provide a technology that can make the outline of a spherical lens appropriately clear regardless of the presence or absence of a lens frame, thereby improving the effect in terms of appearance.

[0013] Solutions to the problem

[0014] A first aspect of the present invention relates to a spectacle lens comprising:

[0015] A lens substrate having an optical surface, and

[0016] an antireflection film covering the optical surface of the lens substrate,

[0017] The antireflection film has a multilayer structure including a stack of a low refractive index layer and a high refractive index layer.

[0018] The antireflection film includes a reactive layer having a relatively higher reactivity to irradiation with an ultrashort pulse laser than other layers included in the antireflection film.

[0019] In a removal portion formed by at least partially removing a given layer including the outermost layer of the multilayer structure, the high refractive index layer located on the lower side of the reaction layer, or a part of the reaction layer remaining is exposed, thereby applying a mark in a spherical shape to the eyeglass lens so that the removal portion can be visually recognized by visible light.

[0020] A second aspect of the present invention relates to the spectacle lens according to the first aspect, wherein:

[0021] The removed portion also constitutes a decorative pattern in addition to the spherical mirror-shaped marking.

[0022] A third aspect of the present invention relates to the eyeglass lens according to the second aspect, wherein:

[0023] The decorative pattern is applied to the inner end of the spherical mirror-shaped marking.

[0024] A fourth aspect of the present invention relates to the spectacle lens according to any one of the first to third aspects, wherein:

[0025] The marking of the spherical mirror shape is ring-shaped.

[0026] A fifth aspect of the present invention relates to a pair of glasses comprising:

[0027] A spherical spectacle lens having a trimming line for trimming the outer edge, and

[0028] A frame for assembling the above-mentioned spherical spectacle lenses,

[0029] The above-mentioned spectacle lenses have:

[0030] A lens substrate having an optical surface, and

[0031] an antireflection film covering the optical surface of the lens substrate,

[0032] The antireflection film has a multilayer structure including a stack of a low refractive index layer and a high refractive index layer.

[0033] The antireflection film includes a reactive layer having a relatively higher reactivity to irradiation with an ultrashort pulse laser than other layers included in the antireflection film.

[0034] At a removed portion formed by at least partially removing a given layer including the outermost layer of the multilayer structure, the high refractive index layer located on the lower layer side of the reaction layer or a part of the reaction layer remaining is exposed, whereby the removed portion is marked in the form of the trimming line so that the removed portion can be visually recognized by visible light.

[0035] The trimming line can be visually recognized when the spectacle lens is viewed from an object surface side of the spectacle lens in a state where the spectacle lens is mounted on the spectacle frame.

[0036] A sixth aspect of the present invention relates to the glasses according to the fifth aspect, wherein:

[0037] The removed portion also constitutes a decorative pattern in addition to the trimming line.

[0038] A seventh aspect of the present invention relates to the glasses according to the sixth aspect, wherein:

[0039] The decorative pattern is applied to the inner end of the trimming line.

[0040] An eighth aspect of the present invention relates to the glasses according to any one of the fifth to seventh aspects, wherein:

[0041] The above-mentioned cutting edge line is annular.

[0042] A ninth aspect of the present invention relates to the glasses according to any one of the fifth to seventh aspects, wherein:

[0043] The frame of the above-mentioned frame is frameless or semi-frame.

[0044] The trimming line is at least marked in the form of a virtual frame at a location where the frame is not present.

[0045] Effects of the Invention

[0046] According to the present invention, the outline of the spherical lens is appropriately clear regardless of the presence or absence of a lens frame, thereby improving the effect in terms of appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1A This is a front view showing a spectacle lens according to an embodiment of the present invention.

[0048] Figure 1B This is a bottom view showing a spectacle lens according to one embodiment of the present invention.

[0049] Figure 2A This is a front view showing a spectacle lens according to another embodiment of the present invention.

[0050] Figure 2B Yes Figure 2A A partial schematic front view of the glasses after the spectacle lenses are cut and inserted into the frames.

[0051] Figure 2C Yes Figure 2A FIG. 1 is a partial schematic front view of a pair of glasses after the spectacle lens is cut into a frame and embedded in a half-frame type frame. FIG. 2 is a front view of a spectacle lens according to another embodiment of the present invention.

[0052] Figure 3A This is a front view showing a spectacle lens according to another embodiment of the present invention.

[0053] Figure 3B Yes Figure 3A A partial front view of the glasses after the glasses lenses are cut and embedded in the half-frame frame.

[0054] Figure 4 This is a front view showing a spectacle lens according to another embodiment of the present invention.

[0055] Figure 5 This is a front view showing a spectacle lens according to another embodiment of the present invention.

[0056] Figure 6 This is a front view showing a spectacle lens according to another embodiment of the present invention.

[0057] Figure 7 It is used for Figure 4 An explanatory diagram for explaining a preferred example of a trimming line when serving as a base.

[0058] Figure 8 This is a front view showing an example of processing of a spectacle lens according to an embodiment of the present invention.

[0059] Fig. 9 It is shown that Figure 1A A diagram showing a specific example in which the decorative pattern as a basis is provided inside the trimming line and at the end of the spherical shape (for example, at least any one of the four corners).

[0060] Fig.10 This is a flowchart showing an example of the procedure of the method for manufacturing a spectacle lens according to one embodiment of the present invention.

[0061] Fig.11It is a side cross-sectional view showing an example of a laminated structure of thin films in a spectacle lens according to an embodiment of the present invention.

[0062] Fig.12 This is an explanatory diagram showing a schematic configuration example of a laser processing device used in a method for manufacturing a spectacle lens according to an embodiment of the present invention.

[0063] Fig.13 It is an explanatory diagram showing an example of the configuration of the main parts of the spectacle lens according to one embodiment of the present invention.

[0064] Explanation of symbols

[0065] 1…(before spherical processing) eyeglass lens, 1A…(after spherical processing) eyeglass lens (spherical lens), 2…frame shape, 2F…frame, 2M…marking (trimming line), 3…decorative pattern, 4…scannable range, 5…spherical shape, 11…lens substrate (optical substrate), 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…non-processing area, 16…laser scanning area (patterning area), 21…laser light source section, 22…AOM system section, 23…beam shaping section, 24…current scanning section, 25…optical system DETAILED DESCRIPTION

[0066] <Summary of this embodiment>

[0067] Hereinafter, embodiments of the present invention will be described based on the drawings.

[0068] Figure 1A This is a front view showing a spectacle lens according to an embodiment of the present invention.

[0069] Figure 1B This is a rear view showing a spectacle lens according to an embodiment of the present invention.

[0070] Figure 2A This is a front view showing a spectacle lens according to another embodiment of the present invention.

[0071] Figure 2B Yes Figure 2A A partial front view of the glasses after the glasses lenses are cut and embedded in the full-frame frame.

[0072] Figure 2C Yes Figure 2A A partial front view of the glasses after the glasses lenses are cut and embedded in the half-frame frame.

[0073] Figure 3AThis is a front view showing a spectacle lens according to another embodiment of the present invention.

[0074] Figure 3B Yes Figure 3A A partial front view of the glasses after the glasses lenses are cut and embedded in the half-frame frame.

[0075] Figure 4 This is a front view showing a spectacle lens according to another embodiment of the present invention.

[0076] Figure 5 This is a front view showing a spectacle lens according to another embodiment of the present invention.

[0077] Figure 6 This is a front view showing a spectacle lens according to another embodiment of the present invention.

[0078] In this specification, unless otherwise specified, reference is made to a situation where a third person looks directly at the person wearing the glasses.

[0079] 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, an example is given in which the optical center is made to coincide with the geometric center and the core center.

[0080] Hereinafter, the optical center is also referred to as the lens center.

[0081] In the spherical lens after the frame cutting, the side of the frame center is called the inner side, and the side of the outermost edge of the spherical lens is called the outer side. The outline of the outermost edge of the spherical lens is consistent with the outline of the spherical shape 5 of the eyeglass lens 1 before the frame cutting. As the name suggests, the frame center is the center position of the spherical lens (i.e., the area within the frame) when a third person looks directly at the state of wearing the glasses.

[0082] The center position of the spherical lens can be the geometric center of the rectangle (box frame) that is circumscribed with the spherical lens and contains the spherical lens. The center of the frame can be consistent with the optical center and the core center.

[0083] Regarding the following provisions using the expression "lens center" in relation to eyeglass lenses, in eyeglasses in which a spherical lens cut from a frame is fitted into a frame, "lens center" may be used instead of "frame center" for reference.

[0084] The spectacle lens of this embodiment includes:

[0085] A lens substrate having an optical surface, and

[0086] an antireflection film covering the optical surface of the lens substrate,

[0087] The antireflection film has a multilayer structure including a stack of a low refractive index layer and a high refractive index layer.

[0088] The antireflection film includes a reactive layer having a relatively higher reactivity to irradiation with an ultrashort pulse laser than other layers included in the antireflection film.

[0089] In a removal portion formed by at least partially removing a given layer including the outermost layer of the multilayer structure, the high refractive index layer located on the lower side of the reaction layer, or a part of the remaining reaction layer is exposed, thereby applying the mark (or pattern, hereinafter collectively referred to as mark) 2M in a spherical shape to the eyeglass lens so that the removal portion can be visually recognized by visible light.

[0090] Furthermore, by performing the marking 2M in a spherical shape, the method for manufacturing the eyeglass lens of the present embodiment is also established.

[0091] Specific examples, preferred examples and modified examples of the lens substrate and the anti-reflection film described above will be described in detail in the following . The above-mentioned mark 2M, which is one of the notable features of the present embodiment, will be described below.

[0092] In the present embodiment, the marking is formed by partially removing the anti-reflection film. The marking 2M is spherical. The "spherical shape (cut lens-like)" may be a spherical shape (cut lens shape) 5 predetermined for a certain eyeglass lens before processing, or it may not be the spherical shape (cut lens shape) 5. In the present specification, the "spherical shape" refers to the shape of the eyeglass lens when looking straight on, which can be made into a spherical shape. Specifically, the spherical shape is mainly composed of arcs (concave toward the center of the lens) and / or straight lines. If the predetermined spherical shape is a complex shape, curves other than arcs can also be used in accordance with the spherical shape. In other words, single-point marks (trademarks, company-specific marks) are excluded from the "spherical mark 2M". In addition, numbers, characters, etc. such as manufacturing numbers are also excluded. It should be noted that these characters, numbers, and single-point marks can be provided on the eyeglass lens of this embodiment as a decorative pattern 3 (described later) that is distinguished from the above-mentioned marking 2M.

[0093] In addition, the spherical mirror-shaped mark 2M can also be formed as a band-shaped area of ​​a given width near the outer edge in accordance with the shape of the outer edge of the lens after the frame is cut. As described later, it can also be formed along a part of the outer edge of the lens after the frame is cut. In this case, it can be formed as a band-shaped area with a desired width and length as described later.

[0094] When the spherical shape 5 is determined for a certain spectacle lens before processing, the marking 2M of the spherical shape can also be alternatively referred to as a "trimming line 2M" for the spherical shape 5. That is, in this embodiment, it can also be said that the trimming line 2M is marked on the spectacle lens before processing.

[0095] The features of the trimming line 2M described below are also applicable to the above-mentioned marking 2M. In the following, for the convenience of description, the trimming line 2M is mainly used for description.

[0096] As the name implies, the “trimming line 2M” in this specification refers to a line for trimming the outline of the spherical shape 5 as a predetermined cutting position. The trimming line 2M may also be a shape similar to the outline of the spherical shape 5.

[0097] However, it should be noted that the “similar” may not be the same size ratio strictly speaking. The reason is that the spherical lens is generally not a perfect circle, and the width in the vertical and horizontal directions is different. Therefore, when simply enlarging or reducing, the distance between the outline of the spherical shape 5 and the trimming line 2M will become different, for example, at the top and on the left. Therefore, the trimming line 2M can be a similar shape to the outline of the spherical shape 5, or a similar shape with a slight deformation applied in a manner that the difference in the distance between the outline of the spherical shape 5 and the trimming line 2M converges to about 10%.

[0098] It should be noted that the outline of the spherical shape 5 as the predetermined cutting position may or may not be marked relative to the eyeglass lens. When the trimming line 2M is marked in a manner overlapping with the outline of the spherical shape 5, the outline of the spherical shape 5 will naturally be marked relative to the eyeglass lens. For example, in the eyeglass lens 1 of the present embodiment, if the width of the trimming line 2M is increased, the trimming line 2M will extend beyond the frame shape 2 in the eyeglass lens 1A after being framed in the eyeglass frame 2F. Figure 2A , Figure 2B On the other hand, the trimming line 2M may be marked in a state where the trimming line 2M is not in contact with the spherical shape 5 (in detail, not in contact with the spherical shape 5 and inside thereof). Figure 1A , Figure 1B , Figure 5 , Figure 6 ).

[0099] On the other hand, the trimming line may be marked at a position that does not overlap with the outline of the spherical shape 5 and is offset inward from the outline of the spherical shape 5. However, it should be noted that since it is called a "trimming line", it is preferably not too separated from the outline of the spherical shape 5. The separation distance (shortest distance) from the outline of the spherical shape 5 to the trimming line is preferably 3.0 mm or less, 2.0 mm, and 1.0 mm or less in this order.

[0100] The "trimming line 2M" in this specification is similar to the above-mentioned mark 2M, and is mainly composed of arcs and / or straight lines. The trimming line 2M can be a closed circle (annular) or an open circle (a state in which a part of the trimming line is removed). The open circle can also be considered as a state in which only a part of the trimming line is set.

[0101] As a specific example of an open circle, Figure 4 As shown in FIG. 1 , only a portion of the contour of the spherical lens is marked with the trimming line 2M. At this time, the location of the trimming line 2M can be, for example, Figure 4 The four locations (four corners) shown in the figure may be other locations.

[0102] The "trimming line 2M" in this specification refers to a portion that can be visually recognized by naked eye observation. For example, there can be a case where the closed circle constituting the trimming line 2M is visually recognized as a dotted line. The solid line portion of the dotted line is formed by arranging a portion of the anti-reflection film exposed in a linear form by continuously performing point processing using the laser processing described later. The blank portion of the dotted line is not exposed in this way. Based on the difference in the processing state of the two, the dotted trimming line 2M can be visually recognized when looking straight at the eyeglass lens. The "trimming line 2M" in this specification refers to the above-mentioned linear portion that has actually been processed. It should be noted that, for the eyeglass lens 1 in the state after being assembled on the frame, the trimming line 2M can be visually recognized by observing from the object surface side of the eyeglass lens 1.

[0103] For example, Figure 7 Provide explanation.

[0104] Figure 7 It is used for Figure 4 An explanatory diagram for explaining a preferred example of a trimming line when serving as a base.

[0105] At once Figure 7 In this specification, it is considered that when the lens center of the spectacle lens before processing is observed and rotated counterclockwise with the right horizontal direction as 0 degrees, a trimming line 2M is formed in the sector area a with a rotation angle of 15 to 60 degrees. Similarly, it is considered that a trimming line 2M is also formed in the sector area b with a rotation angle of 120 to 165 degrees, a sector area c with a rotation angle of 195 to 240 degrees, and a sector area d with a rotation angle of 300 to 345 degrees in this specification. The central angles of the above-mentioned sector areas a to d are all 45 degrees. Each central angle is recorded as a1 to d1.

[0106] That is, the "cutting line 2M" refers to the processed portion that continuously connects the two sides of a fan-shaped area centered on the center of the lens. Figure 7In FIG. 1 , there are a plurality of (a total of 4 corresponding to the fan-shaped areas a to d, respectively) trimming lines 2M. If each trimming line 2M is extended, it will become a closed loop line. Figure 7 Each cutting edge line 2M can also be considered as the solid line part in the dotted line.

[0107] That is, in the example of this paragraph, the cutting side line 2M is provided in the entire area of ​​the sector whose total central angle is 180 degrees (a1+b1+c1+d1=45 degrees×4).

[0108] It should be noted that hidden marks must be provided on the eyeglass lenses so that the left and right (horizontal) direction can be grasped when assembled on the frame, and the up and down (vertical) direction can also be grasped.

[0109] Based on the definition of the trimming line 2M in this way, in the present embodiment, a trimming line 2M can be provided in the entire sector-shaped area where the total center angle in 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).

[0110] The trimming line 2M can be the solid line part of the above-mentioned dotted line, or the solid line itself, or the solid line part of the dotted line (such as the dot in laser processing). The number of lines can be singular or plural (refer to Figure 5 ). When there are multiple threads, the threads may have different thicknesses. In addition, different types of threads may be mixed. Figure 6 As shown, there is provided a checkered pattern (hereinafter referred to as a checkered pattern) in which the solid line portions of the dotted lines and the blank portions are alternately arranged in the vertical direction.

[0111] As a specific value of the width of the trimming line 2M (when the trimming line is composed of multiple lines, it is the minimum width of the outermost part of the outermost line and the innermost part of the innermost line), for example, the minimum width of the line can be greater than 1.0 mm. The maximum width is not limited, for example, it can be set to 3.0 mm or less.

[0112] By adopting the above-mentioned structure, the following advantageous effects can be exerted.

[0113] That is, the design of the eyeglass lens 1A after spherical processing (after being framed in the frame) can be improved. For the frame, in addition to the advantage of maintaining the strength of the glasses, it also has the effect of making the outline of the spherical lens clear and thus becoming a highlight in the wearer's appearance. Furthermore, by adopting the above-mentioned structure, the trimming line plays a role as a so-called virtual frame, and even if it is a frameless eyeglass, it can make the outline of the spherical lens clear and improve the appearance.

[0114] That is, it is possible to obtain glasses with a replacement frame that eliminates the weight and field of view restrictions caused by the conventional frame and has the functions of the frame in appearance.

[0115] Alternatively, it may be applied as a conservative virtual frame with a lower presence than the existing frame.

[0116] Furthermore, if the above-mentioned configuration is adopted while using an existing eyeglass frame, it is possible to realize an application such as changing the texture of the eyeglass frame and emphasizing its presence.

[0117] The degree of emphasis can be appropriately selected according to the size (thickness) of the virtual frame.

[0118] The above-mentioned advantageous effects can also be achieved for eyeglasses having eyeglass lenses and eyeglass frames with trimming lines for trimming the outer edges. In addition, the eyeglass frames can be frameless or semi-framed, and the trimming lines can be marked in the form of virtual frames at least in the portion without frames ( Figure 2A , Figure 3A , Figure 3B ).

[0119] In addition, the following advantageous effects can be obtained.

[0120] In the case where a spectacle lens has a defect before spherical processing, it has been previously possible to know whether the defect exists in the spherical lens only after the spherical processing has been performed. Therefore, in order to ensure that there is no risk, all spectacle lenses with defects must be discarded before spherical processing.

[0121] On the other hand, if it is the spectacle lens of this embodiment, there is a trimming line 2M when the spherical mirror shape is processed, and the spectacle lens can be discarded only when there is a defect inside the trimming line 2M. As a result, the spectacle lens that needs to be discarded in the past can also be effectively utilized.

[0122]

[0123] The spectacle lens of the present embodiment has an object-side surface and an eyeball-side surface as optical surfaces.

[0124] The "object side surface (object surface)" is the surface located on the object side when the wearer wears the glasses with the spectacle lens. The "eyeball side surface (eyeball surface)" is the opposite, that is, it is the surface located on the eyeball side when the wearer wears the glasses with the spectacle lens. Generally speaking, the object side surface is convex, and the eyeball side surface is concave, that is, the spectacle lens is a meniscus lens. This is also the same for the spectacle lens after spherical mirror processing (processed lens).

[0125] Figure 8 It is a front view showing a processing example of the eyeglass lens according to the present embodiment.

[0126] In this embodiment, a spectacle lens 1 having a front view circular shape (for example, an outer diameter of φ60 to 80 mm) is subjected to spherical shape processing (frame cutting processing) in which the lens outer shape is cut in accordance with the frame shape 2 of the spectacle frame worn by the wearer.

[0127] In this embodiment, the eyeglass lens has been marked with a trimming line 2M before the spherical shape processing.

[0128] At the same time, in this embodiment, an example is given of marking the optical surface with a single-point mark such as a trademark or a company logo, or a decorative pattern 3 showing text, symbols, patterns, etc., in a manner located within the lens area after the frame is cut.

[0129] In this specification, "decorative pattern 3" refers to a pattern different from trimming line 2M. In this embodiment, both are produced by the same operation content.

[0130] The decorative pattern may be provided inside the trimming line and at the end of the spherical mirror shape 5 (for example, at least any of the four corners). In addition to the trimming line of this embodiment functioning as a virtual mirror frame, by providing the decorative pattern 3 at the end, the decorative pattern 3 can be made into a good protruding point, thereby further improving the aesthetics.

[0131] As an important part of the definition of the above-mentioned end, for example, at least a part of the decorative pattern 3 can be present outside the inscribed circle centered on the center of the frame of the spherical lens (if it is an eyeglass lens before spherical processing, it is the center of the lens).

[0132] In other words, at least a portion of the decorative pattern 3 may be present inside the mark 2M and outside the inscribed circle of the mark 2M.

[0133] The diagram showing this is Fig. 9 .

[0134] Fig. 9 It is shown that Figure 1AA diagram showing a specific example in which the decorative pattern is provided inside the trimming line and at the end of the spherical shape 5 (for example, at least any one of the four corners) as a basis.

[0135] Fig. 9 In the figure, at least the characters "HOY" in the decorative pattern 3 exist outside the above-mentioned inscribed circle (the long two-dot chain line in the figure).

[0136] As for marking, it is considered to use laser irradiation processing that can finely control the irradiation position based on digital data, but it is not preferred because it will reduce the quality and function of the lens. Therefore, in this embodiment, the trimming line 2M and the decorative pattern 3 are marked by the processing sequence described below.

[0137] [1] Method for manufacturing eyeglass lenses

[0138] Here, the processing sequence of the eyeglass lens including the marking of the trimming line 2M and the decorative pattern 3, that is, the sequence of the method for manufacturing the eyeglass lens according to the present embodiment will be specifically described.

[0139] Fig.10 This is a flowchart showing an example of the procedure of the method for manufacturing the eyeglass lens according to the present embodiment.

[0140] When manufacturing eyeglass lenses, a lens substrate as an optical substrate is first prepared, the lens substrate is polished according to the prescription information of the eyeglass wearer, and dyed as needed (step 101, hereinafter referred to as "S").

[0141] As the lens substrate, for example, a resin material having a refractive index (nD) of about 1.50 to 1.74 can be used. Specifically, as the resin material, for example, diethylene glycol allyl carbonate, urethane resin, polycarbonate, thiourethane resin and episulfide resin can be exemplified. However, it can also be formed by other resin materials that can obtain the desired refractive index instead of these resin materials, and it can also be formed by inorganic glass. In addition, the lens substrate has optical surfaces for constituting a given lens shape on the surface on the object side and the surface on the eyeball side. The given lens shape can be the shape of any lens constituting a single-focus lens, a multi-focus lens, a progressive refractive power lens, etc., but in any case, each optical surface is composed of a curved surface determined based on the prescription information of the wearer of the glasses. The optical surface can be formed, for example, by polishing, but it can also be a cast (molded) product that does not require polishing.

[0142] It should be noted that the polishing and dyeing of the lens substrate can be performed using known techniques, and detailed descriptions thereof are omitted here.

[0143] Next, a hard coating film (HC film) is formed on at least one optical surface, preferably on both optical surfaces, of the lens substrate ( S102 ).

[0144] The HC film is, for example, a film made of a curable material containing a silicon compound and 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 material of the lens substrate, for example, about 1.49 to 1.74, and the film structure can be selected according to the material of the lens substrate. By coating with such a HC film, the durability of the eyeglass lens can be improved.

[0145] The HC film may be formed by, for example, a dipping method using a solution in which a curable material including a silicon compound is dissolved.

[0146] After the HC film is formed, an anti-reflection film (AR film) is then formed so as to overlap the HC film ( S103 ).

[0147] The AR film has a multilayer structure in which films with different refractive indices are stacked, and is a film that prevents light reflection by interference. Specifically, the AR film has a multilayer structure in which a low refractive index layer and a high refractive index layer are stacked. The low refractive index layer is formed, for example, of silicon dioxide (SiO2) having a refractive index of about 1.43 to 1.47.

[0148] In addition, the high refractive index layer is formed of a material having a higher refractive index than that of the low refractive index layer, for example, zirconium oxide (ZrO2), tin oxide (SnO2), niobium oxide (Nb2O5), tantalum oxide (Ta2O5), titanium oxide (TiO2), yttrium oxide (Y2O3), aluminum oxide (Al2O3), a mixture thereof (for example, indium tin oxide (ITO)), etc.

[0149] Among them, the high refractive layer composed of Sn and O has a greater reactivity to the ultrashort pulse laser described later than other layers, and thus functions as a reactive layer. Specifically, the above-mentioned SnO2 and ITO meet this condition.

[0150] The "reactive layer" in this specification refers to a layer with low excitation energy when irradiated with laser. In one embodiment of the present invention, ultrashort pulse laser is irradiated. Among them, the SnO2 layer that can become a reactive layer has extremely low excitation energy due to multi-photon absorption (such as two-photon absorption) and is highly reactive. This is also true for the ITO layer, which can also become the reactive layer in this specification.

[0151] As a result, in one embodiment of the present invention, at least a portion of the SnO2 layer (or ITO layer) sublimates or evaporates, and disappears from the irradiated portion together with the SiO2 layer located on the upper layer side. In one embodiment of the present invention, the reaction layer having a relatively high reactivity compared to other layers included in the multilayer structure refers to the SnO2 layer or the ITO layer. The reaction layer can be set to be the most reactive reaction layer compared to other layers included in the multilayer structure.

[0152] It should be noted that the outermost layer of the multilayer AR film is formed as a low refractive index layer (e.g., SiO2 layer). By coating with such an AR film, the pattern formed by laser processing in this manner can achieve improved visual recognition due to the difference in reflectivity of visible light generated by the irradiation of the illumination light.

[0153] In addition, the bottommost layer (on the substrate side) of the multilayer structure is also preferably a low refractive index layer (eg, SiO 2 layer).

[0154] The AR film may be formed by, for example, ion-assisted vapor deposition.

[0155] The water-repellent film may be formed on the low refractive index layer as the outermost layer of the AR film. The water-repellent film may also be called an antifouling film. It should be noted that the formation of the water-repellent film may be performed before or after the marking of this embodiment.

[0156] The water-repellent film is a film that imparts water repellency to a surface, and can be formed by, for example, coating a solution of a fluorine compound such as hexafluoro-meta-xylene.

[0157] The water-repellent film may be formed in the same manner as the AR film, for example, by ion-assisted vapor deposition.

[0158] In addition, other functional layers may be formed on the AR film. Such functional layers may or may not contain metal components, as long as they can achieve a fine processing effect by laser irradiation. In addition, such functional layers may be uniform films or films dispersed on the surface.

[0159] By the above-mentioned film forming treatment, a film such as Fig.11 The film has a laminated structure as shown.

[0160] Fig.11 It is a side cross-sectional view showing an example of the laminated structure of the thin film according to the present embodiment.

[0161] The laminated structure of the example shown in the figure is composed of an HC film 12, an AR film 13, and a water-repellent film 14 laminated in sequence on the optical surface of a lens substrate 11. Among them, the AR film 13 has a multilayer structure in which a SiO2 layer 13a as a low refractive index layer and a SnO2 layer 13b and a ZrO2 layer 13c as high refractive index layers are laminated, and is configured in such a way that the outermost layer (i.e., the surface layer on the water-repellent film 14 side) is the SiO2 layer 13a.

[0162] Here, the SnO2 layer is a high refractive index layer and also a reactive layer.

[0163] After the film is formed, Fig.10 As shown, the eyeglass lens formed with the film is subjected to marking of the trimming line 2M, frame cutting along the contour of the spherical shape 5, and marking of the decorative pattern 3.

[0164] First, the trimming line 2M is marked on the eyeglass lens after the film is formed. When marking the trimming line 2M, the lens height of the processing area of ​​the processed surface (specifically, the optical surface on the side not locked) of the eyeglass lens to be processed is measured while the locking state is maintained (S107). The measurement method is not particularly limited, and it can be considered to be performed using a non-contact type three-dimensional measuring machine.

[0165] The processing area refers to an area including a laser scanning area described later.

[0166] After the lens height of the processing area is measured, laser processing is then performed by irradiating the processing area with laser light, and raster scanning (S108) is performed to move the irradiation position of the laser light based on the pre-prepared pattern data (i.e., the contour data of the spherical mirror shape 5). Vector scanning may be used instead of raster scanning. In addition, in the present embodiment, the trimming line 2M is marked on the eyeglass lens based on the contour data of the frame shape before the frame cutting processing.

[0167] If the decoration process is to be performed after the frame is cut (S104: after cutting), first, one optical surface of the eyeglass lens to be processed (specifically, the optical surface that is not subjected to the decoration process described later) is assembled to a special fixture by clamp blocking (S105). Then, the blocked eyeglass lens is set in a spherical shape processing machine, and the eyeglass lens is subjected to spherical shape processing (frame cutting process), and the outer shape of the eyeglass lens is cut into the shape of the frame (S106). The clamp blocking and frame cutting process can be performed using known techniques, so detailed descriptions are omitted here.

[0168] After the frame cutting process, the decoration process (ie, marking of the decoration pattern) is then performed. The details of the decoration process and the details of the laser processing for marking the decoration pattern may be the same as those for marking the trimming line 2M.

[0169] After the decorative pattern is marked, the eyeglass lens is removed from the special fixture by unlocking the fixture (S109), and the removed eyeglass lens is cleaned (S110) to remove the residues and attachments (foreign matter) during the marking. Then, after the final lens appearance inspection (S111), the manufacturing of the eyeglass lens is completed.

[0170] On the other hand, for example, if the frame is cut after the trimming line 2M is marked and the decorative pattern 3 is processed (S104: before cutting), the jig locking of the eyeglass lens to be processed is first performed in the same manner as S105 (S112). Next, the lens height of the processed area of ​​the processed surface of the eyeglass lens to be processed (i.e., the three-dimensional shape of the processed area on the processed surface) is measured (S113). The measurement method is the same as in the case of performing decorative processing after the frame is cut.

[0171] After the lens height of the processing area is measured, laser processing is then performed to irradiate the processing area with laser, and raster scanning (S114) is performed to move the irradiation position of the laser based on the pattern data prepared in advance. Vector scanning may also be used instead of raster scanning. Thus, the processing area of ​​the processed surface of the eyeglass lens is marked with a decorative pattern. It should be noted that the details of the laser processing for marking the decorative pattern will be described later.

[0172] After the trimming line 2M is marked and the decorative pattern 3 is marked, the marked eyeglass lens is subjected to frame cutting processing. That is, the locked eyeglass lens is set in a spherical lens processing machine, and the eyeglass lens is subjected to spherical lens processing (frame cutting processing), and the outer shape of the eyeglass lens is cut into the shape of the frame (S115). After the frame cutting processing, the fixture for removing the eyeglass lens from the special fixture is unlocked (S116), and the removed eyeglass lens is subjected to lens cleaning for removing residues, attachments (foreign matter), etc. during processing (S117). Then, after the final lens appearance inspection (S118), the manufacture of the eyeglass lens is completed.

[0173] [2] Details of laser processing

[0174] Next, the laser processing when marking the trimming line 2M and the laser processing when marking the decorative pattern 3 will be described in more detail.

[0175] In this embodiment, the AR film 13 covering the optical surface of the lens substrate 11 is irradiated with laser light, thereby partially removing a predetermined layer including the SiO 2 layer 13 a as the outermost layer of the AR film 13 , thereby enabling marking of a decorative pattern.

[0176] Specifically, if the laser light after passing through the outermost SiO2 layer reaches the SnO2 layer located on the lower layer side, the SnO2 layer sublimates or evaporates due to the energy of the irradiation, and disappears from the irradiated part together with the SiO2 layer located on the upper layer side. In other words, the given layer including the outermost SiO2 layer 13a is partially removed by laser processing by irradiating the laser light. At this time, at the irradiated part, the high refractive index layer on the lower layer side is exposed through the removal process, so as to mark the decorative pattern. The exposed high refractive index layer is, for example, the ZrO2 layer 13c.

[0177] The SnO2 layer 13b can be formed with a thin thickness (for example, 3 to 20 nm, more preferably 3 to 10 nm). In this embodiment, the thickness is set to 5 nm.

[0178] It should be noted that, in the above, SnO2 functions as a reaction layer with the highest reactivity to laser irradiation. The reaction layer preferably contains Sn and O, and ITO can be used in addition to SnO2.

[0179] In addition, in the above, SnO2 is removed by sublimation or evaporation, and ZrO2 as a high refractive index layer located on the lower side is exposed at the irradiation site, but the reaction layer does not have to be completely removed, and a part of it can also remain at the irradiation site. For example, by laser irradiation, the reaction layer can be at least partially removed in the thickness direction of the layer. In addition, as another example of partial removal, it can also be that by laser irradiation, a part of the reaction layer remains in the laser irradiation site when observed not only from the thickness direction of the layer but also from the laser irradiation direction (when viewed straight on). In the example of this paragraph, ZrO2 can also be only partially exposed. The reason is that, like ZrO2, SnO2 (or ITO) is also a high refractive index material. Even if ZrO2 is not completely exposed due to the presence of SnO2 when viewed straight on, there will be no problem in visual recognition. Therefore, as long as the high refractive index layer located on the lower side of the reaction layer, or the partially remaining reaction layer is exposed together with the above-mentioned high refractive index layer.

[0180] The phenomenon that occurs during laser irradiation can be considered as follows: The reaction layer (SnO2, ITO, etc.) is preferably a conductive layer having a higher conductivity than other layers included in the laminate structure.

[0181] According to the inventor's research, the reaction layer formed by SnO2 has a smaller energy corresponding to the band gap of excitation when irradiated with laser light under the conditions described below than SiO2 on the upper layer side (the outermost surface side) and ZrO2 on the lower layer side. Therefore, it is easy to disappear most quickly due to sublimation / evaporation compared to the adjacent layers on the upper layer side and the lower layer side.

[0182] It is believed that a phenomenon called multiphoton absorption (eg, two-photon absorption) occurs at this time, and processing can be performed with very high energy efficiency. Furthermore, it is believed that SnO2 plays an advantageous role when it is a conductive layer at this time.

[0183] It should be noted that there is a concern that ZrO2 on the lower layer side may be damaged by evaporation, dissolution, etc. due to the irradiation energy after SnO2 disappears. In order to utilize the delay until the stage of occurrence of such damage, the irradiation conditions can be controlled so that only the reaction layer and the layer closer to the upper layer are substantially removed. It is further found that in such a delicate processing control, it is advantageous to select the ultrashort pulse laser described later.

[0184] Here, a laser processing device used for laser processing will be briefly described.

[0185] Fig.12 This is an explanatory diagram showing a schematic configuration example of a laser processing device used in the method for manufacturing a spectacle lens according to the present embodiment.

[0186] The laser processing device used in this embodiment is as follows Fig.12 As shown in (a), it includes a laser light source unit 21, an AOM (Acousto Optics Modulator) system unit 22, a beam shaping unit 23, a current scanning unit 24, and an optical system 25, and is configured so that the AR film 13 is irradiated with laser light through the above-mentioned units 21 to 25.

[0187] exist Fig.12 In the embodiment, the laser light source unit 21 emits laser light for laser processing and is configured to emit ultrashort pulse laser light.

[0188] In the present embodiment, there is no particular limitation on the lower limit of the pulse width of the ultrashort pulse laser, as long as it exceeds 0 femtoseconds, preferably above 0.01 picoseconds (10 femtoseconds). If an ultrashort pulse laser of 0.1 picoseconds or longer (including ultrashort pulse lasers of 1 picosecond or longer) is used, it is advantageous in terms of maintenance management and cost of the device and is more suitable for commercial use.

[0189] For example, an ultrashort pulse laser with a pulse width of 0.01 picoseconds (10 femtoseconds) or more and less than 100 picoseconds may be used. An ultrashort pulse laser with a pulse width of 0.01 picoseconds or more and less than 50 picoseconds may be used preferably, and an ultrashort pulse laser with a pulse width of 0.01 picoseconds or more and less than 15 picoseconds may be used more preferably.

[0190] In addition, for example, an ultrashort pulse laser with a pulse width of 0.1 picosecond to less than 100 picoseconds can be used, preferably an ultrashort pulse laser with a pulse width of 0.1 picosecond to less than 50 picoseconds, and more preferably an ultrashort pulse laser with a pulse width of 0.1 picosecond to less than 15 picoseconds.

[0191] Alternatively, an ultrashort pulse laser having a pulse width of 0.01 picosecond or more and less than 1 picosecond (or less than 0.1 picosecond) may be used.

[0192] The wavelength of the ultrashort pulse laser can use a basic wavelength of 1064nm in addition to THG (Third Harmonic Generation) of 355nm or SHG (Second Harmonic Generation) of 532nm. During irradiation, the irradiation beam diameter can be selected according to the desired processing design. In order to process fine designs with high resolution, it is effective to reduce the beam diameter. In this case, the short wavelength side is more advantageous. Therefore, among the above-mentioned wavelengths, 532nm is preferred, and 355nm is more preferred. Alternatively, FHG (Forth Harmonic Generation) of 266nm is also suitable.

[0193] The pulse energy of the ultrashort pulse laser is, for example, 0.1 μJ to 30 μJ (maximum approximately 60 μJ) at 50 kHz. The beam diameter of the ultrashort pulse laser is, for example, 10 μm to 30 μm.

[0194] According to the research of the inventors, the following has been found out regarding the laser irradiation conditions.

[0195] (1) Ultrashort pulse laser with a pulse width of less than 0.1 picosecond

[0196] Good processing can be performed at any wavelength within the range of 266 to 1064 nm. Shorter wavelengths are more advantageous for micro-processing. However, the production load is high in terms of equipment maintenance and cost.

[0197] (2) When the pulse width of ultrashort pulse laser is 0.1 picosecond or more and less than 1 picosecond

[0198] Good processing can be performed at any wavelength within the range of 266 to 1064 nm. Shorter wavelengths are more advantageous for micro-processing.

[0199] (3) When the pulse width of ultrashort pulse laser is 1 picosecond or longer and less than 100 picoseconds

[0200] Good processing can be performed at any wavelength within the range of 266 to 1064 nm. Shorter wavelengths are more advantageous for micro-processing. They are suitable in terms of equipment maintenance management, cost, and stability of production conditions.

[0201] (4) When the pulse width of ultrashort pulse laser is 100 picoseconds or longer and less than 1 nanosecond

[0202] Depending on the applicable wavelength, processing stability varies. For example, if 266nm, which is on the short wavelength side, is used as the applicable wavelength, the lower layer is easily damaged by the reaction of SnO2. In addition, even at 355nm, the uniformity of processing is lost due to slight changes in irradiation conditions, and it is impossible to prevent the removal processing from reaching the lower layer than SnO2.

[0203] (5) Ultrashort pulse laser has a pulse width of more than 1 nanosecond

[0204] It is not possible to perform processing to selectively remove SnO 2 and layers closer to the surface.

[0205] In the cases of (4) and (5) above, the visual recognition of the processed pattern is affected. For example, in the case of eyeglass lenses, there is a risk of interfering with the wearer's field of vision. In addition, when observing the formed decorative pattern, depending on the lighting conditions, it is easy to cause an incomplete visual recognition state in which the observer cannot recognize the pattern.

[0206] In order to prevent the above-mentioned undesirable situations, it is considered important that the removal processing using ultrashort pulse laser is uniform in processing diameter and processing depth. To this end, it is useful to control by adopting a given ultrashort pulse width, utilize the duration based on the irradiation energy, and delay the ablation of the lower layer material.

[0207] As long as such ultrashort pulse laser light can be emitted, there is no particular limitation on the specific configuration of the laser light source unit 21 or the combination of wavelength and pulse width.

[0208] The AOM system unit 22 eliminates the laser beam output immediately after the operation of the current scanning unit 24 starts and ends, thereby suppressing excessive irradiation of the laser beam which causes processing unevenness during laser processing.

[0209] The beam shaping unit 23 converts the energy distribution of the laser light from the laser light source unit 21 from a Gaussian energy distribution to a flat-top energy distribution, thereby enabling laser processing using laser light with uniform energy distribution.

[0210] In particular, if a flat-top distribution is used, when it is desired to partially overlap multiple beam spots to form a processing area of ​​a given area, stable and uniform processing can be performed, because the excessive addition of local energy caused by the overlap of spots can be suppressed.

[0211] The current scanning unit 24 can realize scanning by moving the irradiation position of the laser light from the laser light source unit 21 two-dimensionally or three-dimensionally, thereby enabling the laser light to be used for marking a desired pattern by laser processing. It should be noted that the scannable range (i.e., the maximum laser processing area) 4 of the laser light by the current scanning unit 24 is set to a size and shape that can completely include the outer shape of the eyeglass lens to be processed (see Figure 8 ).

[0212] The optical system 25 is composed of a combination of optical lenses such as a telecentric lens and a mirror, and guides the laser light from the laser light source unit 21 so as to reach a processed portion of the eyeglass lens.

[0213] In addition, the laser processing device used in this embodiment is as follows Fig.12 As shown in (b), it is configured in a manner that laser (i.e., ultrashort pulse laser) irradiation of the AR film 13 can be performed via an optical system 25 or the like by a defocus setting. The defocus setting means that the focal position F of the irradiated laser is set to be separated by a given defocus distance from the surface of the AR film 13, which is the part to be processed by the laser. If the laser is irradiated by such a defocus setting, the beam energy can be dispersed on the surface of the AR film 13 irradiated with the laser, thereby enabling uniform film removal processing. This is particularly useful when the height of the irradiated part varies due to the influence of the surface shape of the AR film 13. However, it is not necessarily limited to the defocus setting. For example, the laser irradiation can also be performed by a focus setting in which the focus position F is consistent with the surface of the AR film 13, or by an alignment focus setting in which the focus position F is separated in the opposite direction of the defocus setting.

[0214] Next, the procedure of laser processing performed using the laser processing device having the above-described configuration will be described.

[0215] During laser processing, the spectacle lens to be processed is first placed in a laser processing device. At this time, the spectacle lens is placed so that the optical surface of the spectacle lens, more specifically, the surface of the AR film 13 in the optical surface, becomes the processed surface. The optical surface to be processed can be any of the surface on the object side and the surface on the eyeball side. Here, for example, the surface on the eyeball side is used as the processed surface.

[0216] After the eyeglass lens is set, the laser light source unit 21 and the current scanning unit 24 are operated based on the pre-prepared pattern data (i.e., pattern data of a given resolution prepared based on the desired decorative pattern). Thus, the processing area of ​​the processed surface of the eyeglass lens is irradiated with an ultrashort pulse laser in a pattern shape corresponding to the decorative pattern.

[0217] When the ultrashort pulse laser is irradiated, the ultrashort pulse laser passes through the water repellent film 14 on the processed surface of the eyeglass lens and reaches the AR film 13 on the processed surface. When the ultrashort pulse laser reaches, the AR film 13 is processed without heating by the ultrashort pulse laser.

[0218] The ablation process of this method is a technology that can perform energy-efficient processing through the multi-photon absorption phenomenon of ultrashort pulse lasers. More specifically, it is a removal process that suppresses the influence of heat around the processing part as much as possible, and causes the laser irradiation part to melt, evaporate or sublimate instantly, thereby causing it to scatter. According to such non-heating processing, highly reactive materials are instantly removed at the irradiation part, so that processing with less thermal influence on the processing part and suppressed thermal damage (deformation caused by heat, etc.) can be performed.

[0219] The laser processing of this embodiment can be made into ablation processing as non-thermal processing. Such processing may induce a multiphoton absorption process (for example, a two-photon absorption process) that may bring about the multiphoton absorption phenomenon mentioned above. Therefore, even for materials that are relatively transparent to laser light (with high transmittance), good processing can be effectively achieved based on multiphoton absorption. In this case, the range of laser wavelengths that can be used is wide, and as the wavelength of the laser, in addition to 355nm (THG) and 532nm (SHG), 1064nm can be advantageously used.

[0220] Furthermore, as mentioned above, in order to induce the above-mentioned multiphoton absorption, picosecond lasers or femtosecond lasers with short pulse widths are advantageous. As specific values, for example, the pulse width can be set to less than 100 picoseconds, preferably less than 50 picoseconds, and more preferably less than 1 picosecond (i.e., femtosecond).

[0221] If non-heating processing is performed by irradiation of ultrashort pulse laser, in the AR film 13, SiO2 in the multilayer structure constituting the AR film 13 will reach the reaction layer (SnO2 in this embodiment) after being transmitted, and the reaction layer will react instantly and sublimate / evaporate, and the SiO2 layer 13a as the outermost layer will be removed. In this way, a given layer including only the outermost layer of the anti-reflection film is partially removed in a pattern shape corresponding to the decorative pattern. In addition, the corresponding part of the water-repellent film 14 is also removed. As a result, the ZrO2 layer 13c located on the lower layer side of the SnO2 layer 13b is exposed at the irradiated portion.

[0222] By performing the laser processing as described above, a given layer including the SiO2 layer 13a as the outermost layer of the AR film 13 is partially removed (forming a removed portion), and the ZrO2 layer 13c as a high refractive index layer is exposed, thereby marking the processed surface of the eyeglass lens with a decorative pattern.

[0223] As described above, the irradiated portion after the predetermined laser irradiation is performed is partially processed within the processed surface.

[0224] The transmittance of the trimming line 2M and the decorative pattern 3 to visible light (wavelength 380nm~780nm) can be set to 80% or more, for example, 80%~95%, or 80~90%, and further 80~85%. In addition, the value obtained by subtracting the transmittance of the visible light of the area other than the trimming line 2M and the decorative pattern 3 from the transmittance of the visible light (wavelength 380nm~780nm) 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, it is not easy to obstruct the field of vision, and a wide and bright field of vision can be obtained.

[0225] [3] The composition of eyeglass lenses

[0226] Next, the structure of the spectacle lens obtained by the manufacturing method of the above-described sequence, that is, the structure of the spectacle lens of the present embodiment will be specifically described.

[0227] Fig.13 (a) is an explanatory diagram showing an example of the configuration of the main parts of the spectacle lens according to the present embodiment.

[0228] Fig.13 (b) shows a specific example of the observation result of the cross section of the AR film 13 using an electron microscope. Fig.13 Parts A and B in (a) show electron microscope images of the laser scanning area 16 and the non-processing area 15.

[0229] like Fig.13As shown in (a), the eyeglass lens of this embodiment is constituted by laminating an HC film 12, an AR film 13, and a water-repellent film 14 in this order on the optical surface of a lens substrate 11. Among them, the AR film 13 has a multilayer structure in which a SiO2 layer 13a as a low refractive index layer and a SnO2 layer 13b and a ZrO2 layer 13c as high refractive index layers are laminated, and a given layer (specifically, a SnO2 layer as a reaction layer and a layer closer to the surface side than the reaction layer) including the SiO2 layer 13a as the outermost layer of the multilayer structure is partially removed, thereby being constituted in a manner that the ZrO2 layer 13c as a high refractive index layer is exposed. That is, the eyeglass lens of this embodiment is composed of a non-processed area 15 and a laser scanning area (patterned area) 16, wherein the non-processed area 15 is an area where the optical surface of the lens substrate 11 is covered with the HC film 12, the AR film 13 and the water-repellent film 14, and the laser scanning area (patterned area) 16 is an area where the outermost SiO2 layer 13a in the AR film 13, the SnO2 layer 13b as the layer directly thereunder, and the water-repellent film 14 are partially removed to expose the ZrO2 layer 13cb as the high refractive index layer.

[0230] One of the non-processed area 15 and the laser scanning area 16 is covered by the SiO2 layer 13a, and the ZrO2 layer 13c (or, in the case where the reaction layer partially remains, the reaction layer as a high refractive layer) is exposed in the other, so the reflectivity of light in each area is different depending on the presence or absence of the SiO2 layer 13a. Therefore, when the appearance of the state where the illumination light is irradiated to the eyeglass lens is observed, the pattern shape formed by the laser scanning area 16 can be visually recognized. In other words, if the laser scanning area 16 is formed in a pattern shape corresponding to the decorative pattern, the decorative pattern can be visually recognized. In this way, the removed portion of the given layer of the AR film 13 can be used as a portion constituting a decorative pattern.

[0231] It is preferable that the reflectance of the trimming line 2M and the decorative pattern 3 is higher than the reflectance of the area other than the trimming line 2M and the decorative pattern 3. That is, the trimming line 2M and the decorative pattern 3 may be formed by exposing the ZrO2 layer 13c as a high refractive index layer.

[0232] The laser scanning area 16 constituting the decorative pattern is formed by removing the SiO2 layer 13a as the outermost layer of the AR film 13 and the SnO2 layer 13b as the layer directly below it. That is, the object of removal is limited to a given layer containing SnO2 as a reaction layer. Therefore, for each layer of the multilayer structure constituting the AR film 13, peeling due to the formation of the laser scanning area 16 can be suppressed.

[0233] As described above, the removal of the SiO2 layer 13a as the outermost layer of the AR film 13 can be achieved by non-heating processing using ultrashort pulse laser irradiation. According to such non-heating processing, the thermal influence on the periphery of the processing part is small, and the occurrence of thermal damage can be suppressed. In addition, by applying the above-given pulse width, stable processing can be performed while suppressing damage to the lower layer side of the reaction layer, thereby exposing 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.

[0234] If the damage to the exposed surface of the ZrO2 layer 13c can be suppressed, the film thickness of the ZrO2 layer 13c can also be suppressed from decreasing due to the removal process. The film thickness of the SiO2 layer 13a, SnO2 layer 13b, ZrO2 layer 13c, etc. can be determined by obtaining an electron microscope image of the cross section of the AR film 13 and analyzing the obtained image.

[0235] Fig.13 (b) shows a specific example of the observation result of the cross section of the AR film 13 using an electron microscope. Fig.13 (a) shows the electron microscope images of the laser scanning area 16 and the non-processing area 15. It should be noted that in the non-processing area 15, the SiO2 layer 13a, the SnO2 layer 13b and the ZrO2 layer 13c are stacked. Since the thickness of the SnO2 layer 13b is thin (for example, about 5nm), it is not easy to identify in the image. On the other hand, in the laser scanning area 16, the SnO2 layer 13b and the SiO2 closer to the surface side are removed, thereby exposing the ZrO2 layer 13c.

[0236] According to the electron microscope image of the example, in the ZrO2 layer 13c exposed by removing SnO2 and the layer closer to the surface side, there is no significant difference between the thickness t1 of the laser scanning 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 portion and the thickness t2 of the non-removed portion is, for example, in the range of 0.90 or more and 1.00 or less, preferably in the range of 0.95 or more and 1.00 or less, and more preferably in the range of 0.99 or more and 1.00 or less.

[0237] As such, in the exposed ZrO2 layer 13c as the high refractive index layer, there is no reduction in film thickness accompanying the removal process, or even if there is a reduction, the reduction is suppressed to a very small amount. This is because the laser scanning area 16 is formed by non-heating processing based on irradiation of ultrashort pulse laser, and no damage will occur to the ZrO2 layer 13c as the underlying layer. This means that if the ratio t1 / t2 of the thickness of the exposed ZrO2 layer 13c is within the above range, the laser scanning area 16 is formed without damaging the ZrO2 layer 13c, and it can be inferred that the formation of the laser scanning area 16 can be performed using non-heating processing based on ultrashort pulse laser.

[0238] The reason why the ZnO 2 layer 13 is not damaged is that the reaction layer (here, the SnO 2 layer) using the ultrashort pulse laser has a higher reactivity than ZnO 2. As described later, this difference in reactivity can be significantly obtained by using an ultrashort pulse laser with a given pulse width.

[0239] It should be noted that by making the thickness of the ZrO2 layer more than 10 times, preferably more than 15 times, that of the SnO2 layer, after the SnO2 layer disappears, even if there is a slight reduction in the ZrO2 layer, it will not affect the risk of film peeling and the visual recognizability of the decorative pattern.

[0240] In addition, the melting point of SnO2 is about 1127°C, which is lower than both SiO2 on the upper layer side and ZrO2 on the lower layer side, and this is considered to be related to the ease of controlling ablation.

[0241] According to the spectacle lens constructed as described above, even if a decorative pattern is engraved, the layers of the AR film 13 constituting the multi-layer structure can be prevented from peeling off, and the exposed ZrO2 layer 13c will not be damaged. Therefore, even in the case of a product applied to a spectacle lens, the quality of the product will not be reduced, and the spectacle lens can be engraved with a decorative pattern.

[0242] [4] Effects of this embodiment

[0243] According to this embodiment, first, the following advantages are exerted.

[0244] One advantageous effect is that the design of the eyeglass lens (spherical lens) 1A after spherical processing (after being framed in a frame) can be improved.

[0245] In addition, the following advantageous effects can be obtained.

[0246] According to the spectacle lens of this embodiment, there is a trimming line 2M during the spherical mirror shape processing, and the spectacle lens can be discarded only when there is a defect inside the trimming line 2M. As a result, the spectacle lens that needs to be discarded in the past can also be effectively utilized. This effect can also be achieved in the spectacle lens of this embodiment, and can also be achieved in the manufacturing method of the spectacle lens.

[0247] The manufacturing method of the eyeglass lens of the present embodiment also has the advantage that when a single-point mark such as a trademark or a company logo is applied, the mark can be performed at once together with the trimming line 2M.

[0248] More specifically, one or more effects shown below can be obtained.

[0249] (a) In the present embodiment, the AR film 13, which is one of the thin films covering the optical surface of the lens substrate 11, is partially removed from the reaction layer (SnO2 in the above embodiment) and the layer closer to the surface of the AR film 13 to expose the ZrO2 layer 13c, which is a high refractive index layer, thereby marking the eyeglass lens with a decorative pattern.

[0250] (b) In the present embodiment, the reaction layer (SnO2 in the above embodiment) of the AR film 13 and the layer closer to the surface side thereof are partially removed by non-heating processing using irradiation of ultrashort pulse laser, thereby exposing the ZrO2 layer 13c as a high refractive index layer, thereby marking the eyeglass lens with a decorative pattern. According to such non-heating processing, the removal processing is performed by the effect of the pulse width compared to the absorption energy effect of the laser, so that only a given layer including the SiO2 layer 13a as the outermost layer of the AR film 13 can be selectively and uniformly removed. In addition, since it is a non-heating processing, it is possible to suppress the occurrence of thermal damage around the processing part, thereby suppressing the occurrence of damage to the exposed surface of the ZrO2 layer 13c located on the lower layer side of the reaction layer.

[0251] (c) As described above, in this embodiment, the ultrashort pulse laser is used to remove the predetermined layer including the outermost layer of the AR film 13, thereby exposing the high refractive index layer, thereby marking the eyeglass lens with a decorative pattern. Therefore, according to this embodiment, it is possible to suppress the peeling of the layers of the AR film 13, and the exposed ZrO2 layer 13c is not damaged. Therefore, even in the case of a product applied to an eyeglass lens, it is possible to achieve marking of the eyeglass lens with a decorative pattern without causing a decrease in the quality of the product.

[0252] (d) In the present embodiment, the pulse width of the ultrashort pulse laser may be greater than 0 femtoseconds, preferably greater than 0.01 picoseconds (10 femtoseconds) and less than 100 picoseconds. If an ultrashort pulse laser of greater than 0.1 picoseconds (including ultrashort pulse laser of greater than 1 picosecond) is used, it is advantageous in terms of device maintenance management and cost, and is more suitable for commercial use.

[0253] More specifically, regarding the laser irradiation conditions, there are the following advantages depending on the pulse width.

[0254] (1) Ultrashort pulse laser with a pulse width of less than 0.1 picosecond

[0255] Good processing can be performed at any wavelength within the range of 266 to 1064 nm. Shorter wavelengths are more advantageous for micro-processing. However, the production load is high in terms of equipment maintenance and cost.

[0256] (2) When the pulse width of ultrashort pulse laser is 0.1 picosecond or more and less than 1 picosecond

[0257] Good processing can be performed at any wavelength within the range of 266 to 1064 nm. Shorter wavelengths are more advantageous for micro-processing.

[0258] (3) When the pulse width of ultrashort pulse laser is 1 picosecond or longer and less than 100 picoseconds

[0259] Good processing can be performed at any wavelength within the range of 266 to 1064 nm. Shorter wavelengths are more advantageous for micro-processing. They are suitable in terms of equipment maintenance management, cost, and stability of production conditions.

[0260] (e) In the present embodiment, when non-heating processing is performed by irradiation of ultrashort pulse laser, ultrashort pulse laser is irradiated to the AR film 13 by defocus setting. If laser irradiation is performed by such defocus setting, the beam energy can be dispersed on the surface of the AR film 13 irradiated with the laser, thereby achieving uniform film removal processing. This is particularly useful when the height of the irradiated portion varies due to the influence of the surface shape of the AR film 13.

[0261] (f) In the present embodiment, non-heating processing using ultrashort pulse laser irradiation is performed under given conditions, so that damage to the exposed surface of the ZrO2 layer 13c as a high refractive index layer exposed by removing SnO2 and layers closer to the surface side thereof can be suppressed. Specifically, the ratio t1 / t2 of the thickness t1 of the ZrO2 layer 13c in the above-mentioned removal portion to the thickness t2 of the ZrO2 layer 13c in the non-removal portion such as the SiO2 layer 13a is, for example, in the range of 0.90 to 1.00, preferably in the range of 0.95 to 1.00, and more preferably in the range of 0.99 to 1.00. In this way, in the ZrO2 layer 13c, the film thickness reduction accompanying the above-mentioned removal processing does not occur, or even if it does, the reduction amount is suppressed to a very small amount. Therefore, in the case of a product applied to eyeglass lenses, it is very preferable in that the eyeglass lenses can be marked with decorative patterns without causing the quality of the product to be reduced.

[0262] [5] Modifications, etc.

[0263] Although the embodiments of the present invention have been described above, the above disclosures are exemplary embodiments of the present invention. That is, the technical scope of the present invention is not limited to the above exemplary embodiments, and various modifications can be made within the scope of the gist thereof.

[0264] In the above-mentioned embodiment, the case of marking the trimming line 2M (and the decorative pattern 3) by non-heating processing using ultrashort pulse laser is listed, but the present invention is not limited to this. That is, the non-heating processing using ultrashort pulse laser can be used as long as it is a non-heating processing for patterning the optical surface of the optical component, and marking other than the trimming line 2M (and the decorative pattern 3) can also be applied in the same way.

[0265] In the above-mentioned embodiment, the following cases are cited as examples for explanation, but the present invention is not limited thereto: the outermost layer of the AR film 13 is the SiO2 layer 13a as a low refractive index layer, the layer below the SiO2 layer 13a is the reaction layer, i.e., the SnO2 layer 13b as a high refractive index layer, and further there is a ZrO2 layer 13c as a high refractive index layer on the lower layer side, and if SnO2 reacts and is partially removed by laser irradiation, SiO2 is also removed, thereby exposing the ZrO2 layer 13c as a high refractive index layer. The AR film 13 can be formed by stacking each layer except the SiO2 layer 13a, the SnO2 layer 13b, and the ZrO2 layer 13c. In addition, as long as the outermost layer of the AR film 13 is a low refractive index layer, it can also be a layer other than the SiO2 layer 13a. As a high refractive index layer, it can also be a layer other than the SnO2 layer 13b or the ZrO2 layer 13c. For example, the SnO 2 layer 13 b as the reaction layer may be replaced with a thin ITO layer having conductivity.

[0266] In the above-mentioned embodiment, the case where the SnO2 layer as the reaction layer contained in the AR film 13 and the SiO2 layer 13a as the outermost layer directly above the SnO2 layer as the reaction layer and the SiO2 layer 13a as the outermost layer directly above the SnO2 layer as the reaction layer and the SiO2 layer 13a as the outermost layer are removed by non-heating processing using an ultrashort pulse laser is cited as an example. As a result, the effect of suppressing film peeling is exerted as described above. In this way, it is possible to realize non-heating processing using an ultrashort pulse laser in a manner that a given multilayer including the outermost layer is removed. Even in the case where the multilayer including the outermost layer is removed, the damage to the exposed surface of the layer exposed by the removal can be suppressed according to the non-heating processing using an ultrashort pulse laser, so the reduction in film thickness accompanying the removal processing can also be suppressed. That is, even in the case where the multilayer including the outermost layer is removed, the ratio t1 / t2 of the thickness t1 of the removed portion to the thickness t2 of the non-removed portion of the layer directly below the removed layer is, for example, in the range of 0.90 or more and 1.00 or less, preferably in the range of 0.95 or more and 1.00 or less, and more preferably in the range of 0.99 or more and 1.00 or less.

[0267] The eyeglass lenses before laser processing in this embodiment can be provided with anti-reflection films on both sides. As a specific example of the eyeglass lenses, the contents described in International Publication WO2020 / 067407 can be cited. In this specification, all the records of the gazette can be referred to. In particular, the eyeglass lenses having the configurations of Examples 1 and 2 described in the gazette (if any configuration is cited, it is Example 1) can be used as a specific example. As a specific example of the eyeglass lenses before decoration in this embodiment, it is described as follows.

[0268] A specific example of a spectacle lens includes a multilayer film on both sides of a lens substrate, and

[0269] The sum of the average reflectances of the surfaces of the above-mentioned eyeglass lenses in the wavelength band of 360 to 400 nm is 6.0% or less.

[0270] The sum of the average reflectances of the surfaces of the above-mentioned eyeglass lenses in the wavelength band of 400-440 nm is 20.0% or more,

[0271] The sum of average reflectances of the surfaces of the spectacle lens in a wavelength band of 480 to 680 nm is 2.0% or less.

[0272] That is, in the light in the blue region, especially in the purple region (400-440 nm) that is to be blocked, the sum of the average reflectances of the various surfaces is set to be 20.0% or more (preferably more than 20.0%, more preferably more than 25.0%). In other words, in the purple region, the reflectance is locally increased.

[0273] Instead, on the low-wavelength side (360~400nm) from the ultraviolet region to the purple region, the sum of the average reflectances of each surface is set to 6.0% or less (preferably less than 6.0%, and more preferably less than 5.0%), thereby locally reducing the reflectance in contrast to the situation in the purple region (400~440nm).

[0274] In addition, from the high wavelength side in the blue wavelength region to the red region (480~680nm), the sum of the average reflectance of each surface is set to less than 2.0% (preferably less than 2.0%, and more preferably less than 1.5%), and in order to achieve the transmission of visible light, the reflectance is particularly locally reduced in the main wavelength band of visible light.

[0275] According to such a specific example, while ensuring the shielding effect for the light in the above-mentioned blue region, it is also possible to ensure the transmission of visible light.

[0276] If the laser processing of this embodiment is performed on the spectacle lens of this specific example, the following advantageous effects can be exerted. The spectacle lens of this specific example ensures the blocking effect for the light in the blue area, that is, the reflectivity of the light in the blue area is high. Therefore, when the spectacle lens 1 is observed from a third party opposite to the front of the wearer of the spectacle lens 1, the spectacle lens looks blue. On the other hand, the laser-processed portion (decorative pattern 3) looks like the color of the layer exposed by laser processing (yellow to gold or silver as the color of the ZrO2 layer in this specific example). As a result, for a third party opposite to the front of the wearer of the spectacle lens 1, in the spectacle lens 1 embedded in the frame, the decorative pattern 3 looks like floating on a blue background. In this case, a decorative pattern 3 with a high effect of appearance design can be obtained. This is also the case when the background is not blue, that is, the reflectivity of the light in the blue area is not high but the reflectivity of the light in the area of ​​other colors is high. As an example of the color of the background, when the spectacle lens 1 is observed from a third party opposite to the front of the wearer of the spectacle lens 1, the spectacle lens 1 can be green or grayish white.

[0277] The above-mentioned good contrast of the decorative pattern 3 during visual recognition can be achieved by laser processing the multilayer films on the object side surface of the eyeglass lens or by laser processing the multilayer films on the eyeball side surface.

[0278] It should be noted that laser processing of each multilayer film on any surface does not substantially cause interference with the wearer's field of vision due to the decorative pattern entering the wearer's field of vision. That is, the eyeglass lens implemented with the decorative pattern 3 of this embodiment does not hinder the wearer's transparent field of vision.

[0279] Therefore, as described above, the portion where the trimming lines and decorative patterns are formed in this embodiment has a high transmittance for visible light, and the difference in transmittance with the portion without decorative patterns is small, so even if it enters the wearer's field of vision, its existence is not actually recognized.

[0280] For example, when this method is applied to frameless or semi-framed glasses, the following advantages can be obtained. That is, it is also possible to consider drawing a virtual frame with a known pigment or other color material near the outer edge of the lens while applying frameless or semi-framed glasses, or forming a virtual frame by forming a concave and convex shape on the surface of the lens. However, the trimming line of this method formed by the above-mentioned laser irradiation is advantageous in that it can free the wearing feeling with the following limitations, that is, the impression that the visual field is demarcated into a certain area, and the outer edge of the visual field is felt to be dark due to the presence of the frame, and can feel a wide and bright field of vision.

[0281] In addition, when the wearer's lens is observed by others (i.e., when the wearer's lens is observed from the object surface side thereof), the decorative pattern 3 can be clearly visually recognized when the wearer's lens is present at a given relative position (or angle) relative to the indoor lighting light or sunlight, but it is not easy to visually recognize when it is not at the above relative position. Therefore, the lens can be given an added value in design due to a change in visual recognition, such as a given decorative pattern 3 clearly appearing or almost disappearing.

[0282] On the other hand, when not in the above-mentioned given relative position relationship, when observed by others, it will be recognized as an ordinary transparent lens (or a given colored lens, dimming lens, polarized lens). Therefore, the phenomenon that a part of the wearer's face is blocked or a shadow is not caused by the presence of the frame, which occurs in glasses with frames, and the wearer's face can be clearly visually recognized.

[0283] Even if the decorative pattern 3 of this embodiment is formed in the lens area after the frame is cut, it will not affect the function of the glasses, but can make the lens carry desired text, symbols, or patterns, or add a desired design to the lens.

[0284] The decorative pattern 3 of this embodiment is a process that can be visually recognized from both the processed surface side and the back side of the lens. This is because in the multi-layer anti-reflection film, after a portion is removed (in this embodiment, SnO2 and SiO2 on the upper layer side are removed), the designed anti-reflection property is reduced in the removed portion, and a contrast in the amount of reflected light can be obtained between the removed portion and the non-removed portion.

[0285] The significant feature of this embodiment is that the trimming line itself is provided in a spherical mirror shape. If this point is taken into consideration, the trimming line does not necessarily have to be formed by partially exposing the anti-reflection film. From this point of view, this embodiment can also be described as follows. It is also possible to combine the various structures described above with the following description.

[0286] “A spectacle lens before being cut into a spherical shape when mounted on a frame, wherein the spectacle lens is marked with a trimming line formed by trimming the contour of the spherical shape as a predetermined cutting position from the inside.”

[0287] "A pair of glasses comprising a lens and a frame, wherein the lens is engraved with a trimming line for trimming the outer edge."

Claims

1. A spectacle lens comprising: A lens substrate having an optical surface, and an antireflection film covering the optical surface of the lens substrate, The antireflection film has a multilayer structure including a stack of a low refractive index layer and a high refractive index layer. The antireflection film includes a reactive layer having a relatively higher reactivity to irradiation with ultrashort pulse laser light than other layers included in the antireflection film, In a removal portion formed by at least partially removing a given layer including the outermost layer of the multilayer structure, the high refractive index layer located on the lower side of the reaction layer, or a part of the remaining reaction layer is exposed, thereby applying a mark in a spherical shape to the eyeglass lens so that the removal portion can be visually recognized by visible light.

2. The eyeglass lens according to claim 1, wherein: The removed portion also constitutes a decorative pattern in addition to the spherical mirror-shaped marking.

3. The eyeglass lens according to claim 2, wherein: The decorative pattern is applied to the end portion of the inner side of the spherical mirror-shaped marking.

4. The spectacle lens according to any one of claims 1 to 3, wherein The marking of the spherical mirror shape is ring-shaped.

5. A pair of glasses comprising: A spherical spectacle lens having a trimming line for trimming the outer edge, and A frame for assembling the spherical spectacle lenses, The spectacle lenses include: A lens substrate having an optical surface, and an antireflection film covering the optical surface of the lens substrate, The antireflection film has a multilayer structure including a stack of a low refractive index layer and a high refractive index layer. The antireflection film includes a reactive layer having a relatively higher reactivity to irradiation with ultrashort pulse laser light than other layers included in the antireflection film, At a removed portion formed by at least partially removing a given layer including the outermost layer of the multilayer structure, the high refractive index layer located on the lower layer side of the reaction layer or the partially remaining reaction layer is exposed, whereby the spectacle lens is provided with a marking in the form of the trimming line so that the removed portion can be visually recognized by visible light, The trimming line can be visually recognized when the spectacle lens is viewed from an object surface side of the spectacle lens in a state where the spectacle lens is mounted on the frame.

6. The glasses according to claim 5, wherein: The removed portion also constitutes a decorative pattern in addition to the trimming line.

7. The glasses according to claim 6, wherein: The decorative pattern is applied to an end portion of an inner side of the trimming line.

8. The glasses according to any one of claims 5 to 7, wherein: The trimming line is annular.

9. The glasses according to any one of claims 5 to 7, wherein: The frame of the glasses frame is frameless or semi-frame. The trimming line is marked in the form of a virtual frame at least at a portion where the frame is not present.

Images