Eyeglass lens manufacturing method

Abstract

To get a highly accurate position of an eye point with respect to a layout position of a frame shape when a spectacle lens is manufactured using a lens whose layout position of a frame is determined beforehand, before processing of the non-optical surface.SOLUTION: Provided is a manufacturing method of a spectacle lens which includes the steps of: determining a position of each mark so that a center position of a frame shape can be specified on the basis of at least three marks; attaching each mark to each determined position; calculating a non-optical surface shape based on the center position when the non-optical surface of a semi-finished lens is processed according to the prescription; and processing the calculated shape with reference to the center position. At least three marks include a pair of marks located on a first straight line passing through the center position when the semi-finished lens is viewed from an optical axis direction, and one mark positioned on a second straight line orthogonal to the first straight line and passing through the center position.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing eyeglass lenses. [Background technology]

[0002] It is known to manufacture eyeglass lenses according to prescriptions using semi-finished lenses, one of which has an optical surface and the other a non-optical surface. For example, the non-optical surface of the semi-finished lens is processed using the geometric center as the reference point for a single-vision lens, or a point specified by a hidden mark as the reference point for a progressive-power lens. The frame shape is then laid out for the processed lens, and the lens is then shaped according to the laid-out frame shape. This results in a cut lens that can be fitted into a frame.

[0003] In recent years, spectacle lenses (hereinafter referred to as "EC lenses") equipped with electrochromic films that can reversibly control color development and fading by applying a voltage have become known (see, for example, Patent Document 1). In semi-finished lenses for this type of EC lens, an electrochromic film that resembles, for example, the frame is attached to the optical surface. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-111389 Summary of the Invention [Problem to be solved by the invention]

[0005] With semi-finished lenses that are not intended for EC lenses, the frame layout position is determined after the non-optical surfaces have been processed. Therefore, during the non-optical surface processing stage, there is no need to precisely determine the eyepoint position relative to the frame shape layout position.

[0006] In contrast, with semi-finished lenses for EC lenses, the frame layout position is already determined before the non-optical surfaces are processed. Therefore, during the non-optical surface processing stage, the eyepoint position must be determined with high precision relative to the layout position of the frame shape. If an error occurs in the eyepoint position relative to the layout position of the frame shape as a result of processing the non-optical surfaces, for example, when shaping is performed to match this eyepoint, the shaping position will be misaligned with the position of the electrochromic film attached to the optical surface, resulting in part of the electrochromic film being cut off and the product being defective. Also, when shaping is performed to match the electrochromic film, the eyepoint position will not be as prescribed.

[0007] In semi-finished lenses for EC lenses, it is conceivable to process the non-optical surfaces based on points specified by the geometric center or hidden marks, as has been done conventionally. However, if these points are used as reference points for processing, it is difficult to process the non-optical surfaces while strictly considering the layout position of the frame shape, making it difficult to determine the eyepoint position with high precision relative to the layout position of the frame shape.

[0008] In view of the above circumstances, an object of the present invention is to provide a method for manufacturing eyeglass lenses that can determine the position of the eyepoint with high precision relative to the layout position of the frame shape when manufacturing eyeglass lenses using lenses whose frame layout position is predetermined before processing of non-optical surfaces, such as semi-finished lenses for EC lenses. [Means for solving the problem]

[0009] A method for manufacturing a spectacle lens according to one embodiment of the present invention includes the steps of: A film having an electrochromic layer between a pair of electrode layers, the film having a frame shape, is attached to the semi-finished lens; and a step of actually measuring the position of the film attached to the semi-finished lens. The center of the frame shape can be determined based on at least three marks. Based on the actual measurement of the film position,The method includes a mark position determination step for determining the positions of at least three marks on the semi-finished lens, a mark application step for applying the at least three marks to the positions on the semi-finished lens determined in the mark position determination step, a calculation step for calculating the shape of the non-optical surface of the semi-finished lens based on a center position when processing the non-optical surface of the semi-finished lens according to a prescription, and a surface shape processing step for processing the non-optical surface into the shape calculated in the calculation step based on the center position. The at least three marks include a pair of marks located on a first line passing through the center position when the semi-finished lens is viewed from the optical axis direction, and one mark located on a second line perpendicular to the first line and passing through the center position.

[0010] In the above calculation step, the eye point position may be calculated taking into consideration the center position, and the shape of the non-optical surface may be calculated based on the calculated eye point position.

[0011] In the marking step, at least three marks may be made on the optical surface of the semi-finished lens.

[0012] A method for manufacturing a spectacle lens according to one embodiment of the present invention may further include a shaping step in which the lens whose non-optical surface has been processed in the surface shape processing step is shaped based on a central position.

[0013] In the marking step, at least three marks may be applied to the portion to be cut in the edging step.

[0014] A method for manufacturing a spectacle lens according to one embodiment of the present invention may further include a step of attaching a film having an electrochromic layer between a pair of electrode layers, the film having a frame shape, to the semi-finished lens.

[0015] The method for manufacturing a spectacle lens according to one embodiment of the present invention may further include a step of marking the optical surface of the semi-finished lens with a mark that resembles the shape of the frame. [Effects of the Invention]

[0016] According to a method for manufacturing eyeglass lenses according to one embodiment of the present invention, when eyeglass lenses are manufactured using lenses whose frame layout position is predetermined before processing of the non-optical surfaces, the eye point position can be determined with high precision relative to the layout position of the frame shape. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a front view of a semi-finished lens according to an embodiment of the present invention. [Figure 2] 1 is a side view of a semi-finished lens according to one embodiment of the present invention. [Figure 3] FIG. 1 is a diagram showing the layout of a semi-finished lens according to an embodiment of the present invention. [Figure 4A] FIG. 10 is a front view of a semi-finished lens according to another embodiment of the present invention. [Figure 4B] FIG. 10 is a front view of a semi-finished lens according to another embodiment of the present invention. [Figure 4C] FIG. 10 is a front view of a semi-finished lens according to another embodiment of the present invention. [Figure 4D] FIG. 10 is a front view of a semi-finished lens according to another embodiment of the present invention. [Figure 4E] FIG. 10 is a front view of a semi-finished lens according to another embodiment of the present invention. [Figure 4F] FIG. 10 is a front view of a semi-finished lens according to another embodiment of the present invention. [Figure 5] 1 is a block diagram showing a configuration of a manufacturing system according to an embodiment of the present invention. [Figure 6] 1 is a flowchart illustrating a method for manufacturing a semi-finished lens according to an embodiment of the present invention. [Figure 7] 7 is a flowchart showing a method for manufacturing eyeglass lenses according to a prescription using semi-finished lenses manufactured according to the flowchart of FIG. 6. [Figure 8] 10A and 10B are diagrams illustrating a method for calculating the position of an eye point relative to a reference position of a frame in an embodiment of the present invention. [Figure 9] 10A and 10B are diagrams illustrating a method for calculating the position of an eye point relative to a reference position of a frame in an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, a method for manufacturing a spectacle lens according to one embodiment of the present invention will be described with reference to the drawings. In this embodiment, a semi-finished lens for an EC lens and a manufacturing method for manufacturing a spectacle lens using this semi-finished lens will be described as an example.

[0019] It should be noted that the semi-finished lenses and manufacturing methods to which the present invention can be applied are not limited to semi-finished lenses for EC lenses and manufacturing methods using such lenses. Semi-finished lenses of other types not intended for EC lenses, in which the frame layout position is predetermined before processing of the non-optical surfaces, and manufacturing methods using such lenses also fall within the scope of the present invention.

[0020] In this embodiment, a method for manufacturing an inside progressive-power lens having a concave progressive-power element is described using a semi-finished lens whose convex surface (object-side surface) is spherically shaped and finished to an optical surface, and whose concave surface (eyeball-side surface) is a non-optical surface, but the semi-finished lens and manufacturing method to which the present invention can be applied are not limited to this. For example, a semi-finished lens whose concave surface is an optical surface and spherical and whose convex surface is a non-optical surface, and a method for manufacturing an outside progressive-power lens using this semi-finished lens having a convex progressive-power element, are also within the scope of the present invention.

[0021] The present invention also includes a semi-finished lens in which a progressive refractive element in one of the vertical and horizontal directions is added to the optical surface, and a method for manufacturing a double-sided compound progressive type progressive power lens using the same. In this case, by processing the non-optical surface and adding a progressive refractive element in the other of the vertical and horizontal directions, a progressive power lens in which the progressive refractive elements in each of the vertical and horizontal directions are allocated to the convex surface and the concave surface can be obtained.

[0022] The present invention also encompasses a semi-finished lens in which a portion of the progressive refractive element is added to the optical surface, and a method for manufacturing a double-sided progressive-power lens using the semi-finished lens. In this case, by processing the non-optical surface and adding the remaining progressive refractive element, a progressive-power lens in which the progressive refractive element is allocated to each of the convex and concave surfaces can be obtained.

[0023] Furthermore, in the present invention, the spectacle lenses manufactured using the semi-finished lenses are not limited to progressive power lenses, but may be other types of spectacle lenses, such as single-focus spherical lenses, single-focus aspherical lenses, and multifocal (e.g., bifocal) lenses other than progressive power lenses.

[0024] Furthermore, instead of a semi-finished lens, a spectacle lens may be manufactured using a lens blank having non-optical surfaces on both sides, one surface of which is finished to be an optical surface.

[0025] 1 is a front view of a semi-finished lens 1 for an EC lens according to one embodiment of the present invention (a front view of the semi-finished lens 1 as seen from the optical axis direction AX). FIG. 2 is a side view of the semi-finished lens 1.

[0026] As shown in FIG. 1, the semi-finished lens 1 has an electrochromic film 20 attached to the optical surface of the semi-finished lens, and a mark 30 attached thereto.

[0027] Hereinafter, for convenience, in order to distinguish between a semi-finished lens before the electrochromic film 20 and the mark 30 are attached and a semi-finished lens after the electrochromic film 20 and the mark 30 are attached, the former will be referred to as a "lens substrate 10" and the latter will be referred to as a "semi-finished lens 1."

[0028] The lens substrate 10 is made of a resin such as acrylic resin, thiourethane resin, thioepoxy resin, methacrylic resin, allyl resin, episulfide resin, or polycarbonate resin, and has a convex surface 12 that is spherical and finished as an optical surface, and a concave surface 14 that is a non-optical surface. The lens substrate 10 may also be made of glass.

[0029] The electrochromic film 20 is a film in which an electrochromic layer is disposed between a pair of electrode layers. The electrochromic layer includes, for example, a reduction layer that changes color in response to a reduction reaction, an oxidation layer that changes color in response to an oxidation reaction, and an electrolyte layer that has electronic insulation and ionic conductivity. By applying a voltage between the pair of electrode layers, a reversible oxidation-reduction reaction occurs, causing the color of the electrochromic layer to change reversibly. The surface of the electrode layer is protected by a plastic or glass layer.

[0030] The electrochromic film 20 is shaped like the frame (hereinafter referred to as "frame shape 20a") that will encase the final eyeglass lens product. The electrochromic film 20 is attached to the convex surface 12 of the lens substrate 10 by, for example, an adhesive.

[0031] In this embodiment, the electrochromic film 20 is attached to the convex surface 12 of the lens substrate 10, but the configuration of the present invention is not limited to this. The electrochromic film 20 may also be embedded in the lens substrate 10 by sheet insert molding.

[0032] In addition, in other types of semi-finished lenses that are not intended for EC lenses, for example, instead of the electrochromic film 20, a mark that resembles the frame shape 20a (in other words, the shape of the cut lens after edging) is made on the convex surface 12 using a laser marker or stamping machine.

[0033] Furthermore, in the semi-finished lens 1 for an EC lens, a mark in the shape of the frame 20a may be applied to the convex surface 12 using a laser marker or stamping machine instead of the electrochromic film 20. In this case, the electrochromic film 20 is attached to the convex surface 12 in a later process (for example, after edging).

[0034] The mark 30 is a mark for specifying a reference position FC of the frame shape 20a formed by the electrochromic film 20. In this embodiment, this reference position FC is the center position (frame center) of the frame shape 20a.

[0035] The center position (reference position FC) of the frame shape 20a is the geometric center of the frame shape 20a and is different from the geometric center of the lens substrate 10. However, the reference position FC may be located at a position that coincides with the geometric center of the lens substrate 10.

[0036] The reference position FC is not limited to the geometric center of the frame shape 20a. In another embodiment, the reference position FC may be a position other than the geometric center of the frame shape 20a, such as the center of gravity of the frame shape 20a.

[0037] The upper diagram in Fig. 3 shows a front view of a semi-finished lens 1 in which the reference position FC does not coincide with the geometric center GC of the lens substrate 10, and the lower diagram in Fig. 3 shows a front view of a semi-finished lens 1 in which the reference position FC coincides with the geometric center GC of the lens substrate 10. For convenience, each of these diagrams shows a circle C with a smaller diameter than the semi-finished lens 1 and centered on the geometric center GC of the lens substrate 10, as a dotted line.

[0038] As shown in the upper diagram of Figure 3, when the reference position FC does not coincide with the geometric center GC of the lens substrate 10, part of the electrochromic film 20 falls outside the circle C. In contrast, as shown in the lower diagram of Figure 3, when the reference position FC coincides with the geometric center GC of the lens substrate 10, the entire electrochromic film 20 falls within the circle C. As can be seen by comparing the upper and lower diagrams of Figure 3, by positioning the reference position FC at a position that coincides with the geometric center GC of the lens substrate 10, the diameter of the semi-finished lens 1 can be reduced to the diameter of the circle C. Reducing the diameter of the semi-finished lens 1 can reduce manufacturing costs.

[0039] 1, a total of four marks 30 are placed on the convex surface 12 of the lens substrate 10 in an area 12a outside the frame shape 20a (in other words, the portion to be cut during edging). The four marks 30 are short line marks and are placed on the top, bottom, right, and left portions of the convex surface 12, respectively. When the semi-finished lens 1 is viewed from the optical axis direction AX (in other words, when the semi-finished lens 1 is viewed from the front), the reference position FC is located at the intersection of a straight line La (one of the first and second lines) connecting the line segments at the top and bottom, and a straight line Lb (the other of the first and second lines) connecting the line segments at the right and left and perpendicular to the line La.

[0040] The mark 30 is made on the convex surface 12 using, for example, a laser marker or an engraving machine.

[0041] After the electrochromic film 20 is attached to the convex surface 12, the attachment position of the electrochromic film 20 is measured. The position of the mark 30 on the convex surface 12 is determined based on this measurement, and the mark 30 is attached to the convex surface 12.

[0042] After the mark 30 is attached to the convex surface 12, the electrochromic film 20 may be attached to the convex surface 12 so that the geometric center of the frame shape 20a is aligned with the reference position FC indicated by the mark 30.

[0043] The mark 30 may be any mark that can objectively identify the reference position FC, and is not limited to the example shown in Fig. 1. Figs. 4A to 4F show front views of a semi-finished lens according to another embodiment.

[0044] As shown in FIG. 4A, a total of three marks 30 may be attached to the region 12a outside the frame shape 20a. In the example of FIG. 4A, the marks 30 include, in a front view of the semi-finished lens 1, a pair of marks 30a located on a line Lc (first line) passing through the reference position FC, and one mark 30b located on a line Ld (second line) perpendicular to the line Lc and passing through the reference position FC. The reference position FC is located at the intersection of the lines Lc and Ld. In other words, there need only be at least three marks 30 so that the reference position FC can be objectively identified, and the number is not limited to four.

[0045] By changing the shapes of the marks 30a and 30b, it becomes easier to determine the up-down direction of the semi-finished lens 1. In the example of Fig. 4A, one mark 30b, which has a different shape from the mark 30a, is attached to the upper part of the convex surface 12. The operator can determine the up-down direction of the semi-finished lens 1 by visually checking the mark 30b.

[0046] The semi-finished lens 1 shown in Fig. 4B differs from the example in Fig. 4A in that the appearances (here, the shapes) of the pair of left and right marks 30a located on the line Lc are different from each other. By making the appearances of the pair of marks 30a different from each other, the operator can determine whether the semi-finished lens 1 corresponds to a right lens or a left lens.

[0047] It should be noted that the pair of marks 30a may be different in color, size, etc., without being limited to shape. Also, it may be possible to determine from the mark 30b alone whether the semi-finished lens 1 corresponds to a right lens or a left lens. As an example, by making the mark 30b an arrow mark pointing toward the nose, it becomes possible to determine from the mark 30b alone.

[0048] 4C, the marks 30 include a pair of marks 30c located on a line Lc and a pair of marks 30d located on a line Ld when the semi-finished lens 1 is viewed from the front. The pair of marks 30c are, for example, arrow marks pointing toward the nose. By visually checking the pair of marks 30b, the operator can determine whether the semi-finished lens 1 corresponds to a right lens or a left lens.

[0049] One of the pair of marks 30d is an arrow mark pointing upward in the lens, and the other of the pair of marks 30d is a short line mark. By visually checking the pair of marks 30b (or the direction of the arrow mark), the operator can ascertain the up-down direction of the semi-finished lens 1.

[0050] In this way, by devising the position and appearance of the mark 30, even if the electrochromic film 20 has a shape that makes it difficult to determine its orientation (for example, a perfect circle), it is possible to prevent the operator from making mistakes such as working with the semi-finished lens 1 in the wrong up, down, left, or right directions.

[0051] As shown in Fig. 4D, three marks 30 may be attached at 120-degree intervals in the region 12a outside the frame shape 20a. In the example of Fig. 4D, the position where the extensions of the three marks 30 intersect is the reference position FC.

[0052] 4E, the mark 30 may be attached to an area inside the frame shape 20a. In other words, the mark 30 may be placed in any area other than the area 12a outside the frame shape 20a as long as it can objectively identify the reference position FC.

[0053] As shown in FIG. 4F, the mark 30 may be directly attached to the reference position FC. That is, the mark 30 is not limited to one that indirectly indicates the reference position FC, but may also be one that directly indicates the reference position FC. When manufacturing a progressive power lens or a lens with an astigmatic power, it is necessary to specify the axial direction of the lens. However, the mark 30 exemplified in FIG. 4F does not allow the operator to grasp the axial direction of the lens. Therefore, in the example of FIG. 4F, a mark indicating the axial direction of the lens may be attached separately.

[0054] 4E and 4F, the mark 30 remains on the cut lens after edging. Therefore, the mark 30 is thinly engraved on the convex surface 12 in the same manner as a hidden mark, for example.

[0055] 4E and 4F , the mark 30 is attached to the convex surface 12, but the configuration of the present invention is not limited to this. The mark 30 may also be attached to the electrochromic film 20. In this case, the mark 30 may be attached to the electrochromic film 20 in advance before the electrochromic film 20 is attached to the convex surface 12, or may be attached to the electrochromic film 20 after the electrochromic film 20 is attached to the convex surface 12.

[0056] 5 is a block diagram showing the configuration of a manufacturing system 100 according to an embodiment of the present invention. As shown in FIG.

[0057] The spectacles store 200 places an order for eyeglass lenses according to a prescription for a customer (wearer). The manufacturing factory 300 manufactures eyeglass lenses upon receiving an order from the spectacles store 200. Orders to the manufacturing factory 300 are placed via a predetermined network such as the Internet or via data transmission by fax or the like. Orderers may include ophthalmologists and general consumers.

[0058] The eyeglass store 200 is equipped with a storefront computer 210. The storefront computer 210 is, for example, a tablet terminal, a smartphone, a desktop PC (Personal Computer), a notebook PC, or the like, and has installed therein software for placing an order for eyeglass lenses to the manufacturing factory 300. It should be noted that eyeglass lenses can also be ordered over the web. In this case, it is not necessary to install the above software on the storefront computer 210. Lens data and frame data are input into the storefront computer 210 by the eyeglass store staff or the wearer themselves through operation of a mouse, keyboard, etc.

[0059] The lens data includes, for example, the wearer's prescription information (distance power, near power, add power, progressive zone length, base curve, spherical power, astigmatic power, astigmatic axis direction, prism power, prism base direction, interpupillary distance (PD), etc.), spectacle lens wearing conditions (distance eyepoint position, corneal vertex distance, anterior tilt angle, frame tilt angle), spectacle lens type (single-focus spherical, single-focus aspherical, multifocal (bifocal, progressive), coating (dyeing, hard coat, anti-reflective coating, UV protection, etc.)), layout data according to the wearer's requests, and whether or not the lens has a photochromic or color-adjusting function.

[0060] The frame data includes shape data of the frame selected by the wearer. The frame data is managed, for example, by a barcode tag and can be obtained by reading the barcode tag attached to the frame with a barcode reader. The frame shape data may also be acquired by a frame tracer installed in the eyeglass store 200.

[0061] The storefront computer 210 transmits the order data (lens data and frame data) to the manufacturing factory 300 via, for example, the Internet.

[0062] A LAN (Local Area Network) is constructed in the manufacturing factory 300, with a host computer 310 at its center. The host computer 310 is connected to a number of terminal devices, including a design computer 320, which constitutes a manufacturing device for eyeglass lenses.

[0063] The design computer 320 is, for example, a general-purpose PC, and has a program for designing eyeglass lenses installed. Order data transmitted from the in-store computer 210 via the Internet is input to the host computer 310. The host computer 310 transmits the input order data to the design computer 320.

[0064] In order to improve productivity, the manufacturing factory 300 divides the entire production range of power into multiple groups, and various lens substrates 10 (i.e., semi-finished lenses) having convex curve shapes (e.g., spherical shapes, aspherical shapes, etc.) and lens diameters that match the power range of each group are prepared in advance in preparation for orders for eyeglass lenses.

[0065] FIG. 6 is a flowchart showing a method for manufacturing the semi-finished lens 1.

[0066] In this manufacturing method, first, the design computer 320 identifies the lens substrate 10 that is suitable for the wearer's prescription from among multiple types of lens substrates 10 with different powers and lens diameters based on the order data (step S101).

[0067] Next, the design computer 320 specifies a flat electrochromic film 20 having a shape corresponding to the frame specified in the order data (step S102).

[0068] The operator sets the flat electrochromic film 20 specified in step S102 in a mold and forms it into a curved shape (step S103). As a specific example, a mold is selected to match the shape of the convex surface 12 of the lens substrate 10 specified in step S101, and the electrochromic film 20 is sandwiched between the convex and concave molds of the selected mold and heated at a predetermined temperature. This thermoforming results in an electrochromic film 20 with a curved shape.

[0069] The electrochromic film 20 formed into a curved shape is matched with the convex surface 12 of the lens substrate 10 and attached to the convex surface 12 with an adhesive (step S104). That is, step S104 is a step of attaching the electrochromic film 20 (a film having an electrochromic layer between a pair of electrode layers and shaped like a frame) to the semi-finished lens (lens substrate 10). Step S104 results in a lens substrate 10 with the electrochromic film 20 attached to the convex surface 12.

[0070] For example, when manufacturing a semi-finished lens of a type other than an EC lens, step S104 can be replaced with a step of marking the optical surface of the semi-finished lens with a mark that resembles the frame shape.

[0071] The attachment position of the electrochromic film 20 attached to the convex surface 12 is measured. The position of the mark 30 is determined based on this measurement (step S105). In other words, step S105 is a mark position determination step that determines the positions of at least three marks 30 on the semi-finished lens (lens substrate 10) so that the reference position FC can be identified based on at least three marks 30.

[0072] Four marks 30 are made on the convex surface 12 of the lens substrate 10, in an area 12a outside the frame shape 20a, using a laser marker or engraving machine (step S106). That is, step S106 is a marking step in which at least three marks 30 are made at the respective positions on the semi-finished lens (lens substrate 10) determined in step S105. Through this step, the semi-finished lens 1 shown in FIGS. 1 and 2 is obtained.

[0073] When applying the mark 30 to the convex surface 12, a hidden mark or other necessary information (for example, a quality assurance mark or an identification symbol) may also be applied to the convex surface 12. In this case, manufacturing efficiency can be improved compared to when the mark 30 and the hidden mark are applied in separate processes.

[0074] FIG. 7 is a flowchart showing a method for manufacturing a prescription eyeglass lens using the semi-finished lens 1 manufactured according to the flowchart of FIG.

[0075] Conventionally, the concave shape is calculated based on a point specified by a hidden mark (the geometric center in the case of a single-vision lens), and the concave surface is machined based on this point. However, even if the concave shape is calculated and machined based on this point, it is difficult to calculate and machine the concave shape while strictly considering the layout position of the electrochromic film 20 already attached to the convex surface 12, making it difficult to accurately determine the eyepoint position relative to the layout position of the electrochromic film 20. Therefore, errors in the eyepoint position relative to the layout position of the electrochromic film 20 can cause problems during edging, such as a portion of the electrochromic film 20 being cut off or the eyepoint position not being as prescribed.

[0076] 7, the concave shape is calculated based on a reference position FC of the frame shape 20a formed by the electrochromic film 20, and the concave surface is machined based on the reference position FC. Since the calculation and machining of the concave shape take into account the layout position of the frame shape 20a, errors in the eyepoint position relative to this layout position are reduced, and the occurrence of the above-mentioned problems is suppressed.

[0077] 7, the design computer 320 calculates the concave shape and the lens shape based on the order data and the reference position FC (step S201). That is, step S201 is a calculation step in which the shape of the concave surface 14 of the semi-finished lens 1 when processing the concave surface 14 according to a prescription is calculated based on the reference position FC.

[0078] Prior to the processing of step S201, shape data of the frame is acquired. The shape data of the frame may be known data, or may be data measured by measuring instrument 330. In the former case, design computer 320 stores shape data of various frames in advance.

[0079] A case will be described where shape data of a frame measured by the measuring instrument 330 is acquired. In measuring the shape of the frame, the measuring probe of the measuring instrument 330 is brought into contact with the bevel groove of the frame. The measuring instrument 330 rotates the measuring probe around a predetermined point to detect shape coordinate values ​​(Rn, θn, Zn) (n=1, 2, . . . , N) of the bevel groove. The detected shape coordinate values ​​(Rn, θn, Zn) are transferred to the design computer 320.

[0080] The design computer 320 calculates, for example, based on the shape coordinate values ​​(Rn, θn, Zn), the center position (a, b, c) of the virtual sphere, the radius value RB of the virtual sphere when the frame is on the virtual sphere, the frame PD (Pupillary Distance), the frame nose width DBL, the frame flap angle, the forward tilt angle, etc.

[0081] In step S201, the concave shape is calculated based on the reference position FC, and therefore the eye point position is also calculated based on the reference position FC. A method for calculating the eye point position relative to the reference position FC will be described using Fig. 8 and Fig. 9. Fig. 8 is a perspective view showing the relationship between each constant of the virtual sphere and Cartesian coordinate values. Fig. 9 is a perspective view of the left and right eyeglass lenses arranged based on the layout positions of the frame shape 20a.

[0082] The shape coordinate values ​​(Rn, θn, Zn) detected by the measuring device 330 are converted into frame shape coordinate values ​​(Xn, Yn, Zn) (n=1, 2, . . . , N). Specifically, as shown in FIG. 8, among the frame shape coordinate values ​​(Xn, Yn, Zn), the Cartesian coordinate value (Xn, Yn) is obtained by converting the polar coordinate value (Rn, θn). Furthermore, Zn is calculated as the Z-axis coordinate value at (Xn, Yn) on the spherical surface. The Z-axis direction is the front direction of the frame.

[0083] In this calculation method, the "frame coordinates" are defined with the datum line, which is the horizontal reference axis of the glasses, as the X axis, the vertical direction of the glasses as the Y axis, and the front direction of the glasses as the Z axis. Then, on this frame coordinates, two frame shape coordinate values ​​(Xn, Yn, Zn) are defined with the center positions of the left and right frames as the reference position FC.

[0084] Specifically, first, two frame shape coordinate values ​​(Xn, Yn, Zn) are set so that the X coordinate values ​​of the nose-side points P1 and P2 of each of the left and right frame shapes 20a are -HDBL and +HDBL, respectively. HDBL is the frame nose width DBL divided by 2.

[0085] Furthermore, one frame shape coordinate value (Xn, Yn, Zn) (whose X coordinate value on the nasal side is −HDBL) is rotationally moved by the frame swing angle around an axis that is a straight line that passes through point P1 and is parallel to the Y axis, and the other frame shape coordinate value (Xn, Yn, Zn) (whose X coordinate value on the nasal side is +HDBL) is rotationally moved by the frame swing angle around an axis that is a straight line that passes through point P2 and is parallel to the Y axis. Furthermore, one frame shape coordinate value (Xn, Yn, Zn) may be rotationally moved by the forward tilt angle around an axis that is a straight line that passes through point P1 and is parallel to the X axis, and the other frame shape coordinate value (Xn, Yn, Zn) may be rotationally moved by the forward tilt angle around an axis that is a straight line that passes through point P2 and is parallel to the X axis.

[0086] In this way, the position and orientation of the eyeglass lens relative to the three-dimensional frame shape defined on the frame coordinates are specified by determining the eyepoint positions EP1, EP2 and the normal directions NL1, NL2 on the convex surface of the eyeglass lens at these eyepoint positions.

[0087] The eyepoint positions EP1 and EP2 are points on the convex surface of the spectacle lens that should be located at the center of the wearer's pupil when wearing the glasses. Layout information for the eyepoint positions EP1 and EP2 is included in the lens data acquired by the spectacles store 200, and includes the horizontal distance HPD from the center line of the wearer's nose to the center of the pupil, and the vertical distance EPHT from the datum line to the center of the wearer's pupil. Hereinafter, the horizontal distance and vertical distance of the spectacle lens for the right eye will be referred to as HPD, respectively. R , EPHT R The horizontal distance and vertical distance of the spectacle lens for the left eye are denoted by the symbol HPD. L , EPHT L is attached.

[0088] Therefore, the X and Y coordinates of the eyepoint position EP1 are (-HPD R ,EPHT R ) and the X and Y coordinates of the eye point position EP2 are determined as (-HPD L ,EPHT LThe Z coordinate of the eye point position EP1 is determined according to the bevel position (the position where the bevel is provided on the edge of the lens, for example, whether it is a convex surface or a concave surface). The bevel position is included in the lens data acquired by the eyeglass store 200, for example.

[0089] In this way, the eyepoint positions EP1 and EP2 relative to the reference position FC (i.e., the positions of the eyepoints relative to the layout position of the electrochromic film 20) are determined. The concave shape and rim shape of the semi-finished lens 1 according to the prescription are calculated so that the eyepoints are laid out at the determined positions EP1 and EP2. That is, in step 201, the eyepoint positions EP1 and EP2 are calculated taking into account the reference position FC, and the shape of the concave surface 14 is calculated based on the calculated eyepoint positions EP1 and EP2. Note that the calculation process for the concave shape and rim shape according to the prescription is well known, so a detailed description thereof will be omitted here.

[0090] A blocking jig 342 is attached to the convex surface 12 of the semi-finished lens 1 via a low-melting-point alloy such as alloy (step S202). That is, blocking is performed.

[0091] Specifically, in step S202, the semi-finished lens 1 is photographed by a camera device mounted on the lens blocker 340, and the photographed semi-finished lens 1 is displayed on the display of the lens blocker 340. On the display, a mark image is displayed superimposed on the photographed image at a position determined in advance by calculation. The mark image is, for example, an image of a short line segment like the mark 30, and a total of four mark images are displayed at the top, bottom, right and left of the screen.

[0092] The point that serves as a reference when the block jig 342 holds the semi-finished lens 1 for concave machining and edging is called the machining origin. The operator fine-tunes the position of the semi-finished lens 1 while checking the four marks 30 and four mark images affixed to the semi-finished lens 1 displayed on the display, and blocks the semi-finished lens 1 at a position where each of the four marks 30 matches the corresponding mark image. This brings the semi-finished lens 1 into a state where it is held by the block jig 342 so that the reference position FC becomes the machining origin.

[0093] The concave surface shape data calculated in step 201 is transmitted from the design computer 320 to the curve generator 350. Based on the concave surface shape data, the curve generator 350 grinds the concave surface 14 of the semi-finished lens 1 held in the block jig 342 so that it has the concave surface shape calculated in step 201 (i.e., so that the shape and power according to the prescription are obtained) (step S203). That is, step S204 is a surface shape processing step in which the concave surface 14 of the semi-finished lens 1 is processed into the shape calculated in step 201 based on the reference position FC.

[0094] In step 201, the concave shape is calculated taking into account the eyepoint position relative to the reference position FC, so the eyepoint position relative to the layout position of the frame shape is determined with high accuracy. Therefore, by performing concave processing using the reference position FC as the processing origin, the eyepoint position relative to the layout position of the frame shape can be determined with high accuracy.

[0095] To improve the gloss of the concave surface 14 and the adhesion of the coating agent, the concave surface 14 is polished by a polishing machine 360 ​​(step S204). As a result, the concave surface 14 is formed as an optical surface that satisfies the prescription.

[0096] The low-melting-point alloy is melted by hot water, and the semi-finished lens 1 is removed from the block jig 342 (step S205). Next, the semi-finished lens 1 is cleaned by the cleaner 370 to remove dirt and foreign matter (step S206).

[0097] The coating device 380 applies a coating (for example, a hard coat or an anti-reflection coating) to the convex surface 12 (and the electrochromic film 20) and the concave surface 14 of the semi-finished lens 1 (step S207).

[0098] Here, an electrochromic film 20 shaped like a frame shape 20a is attached to the semi-finished lens 1. This allows the operator to easily distinguish between the portion of the semi-finished lens 1 that will ultimately be used as a spectacle lens and the portion that will not be used.

[0099] For example, consider a case where there is a defect (such as a scratch or foreign matter mixed in during the coating process) in the area 12a outside the frame shape 20a. Because the area 12a is the part that is cut during edging, this defect will not remain in the final eyeglass lens product. Therefore, even a semi-finished lens 1 with such a defect can be used as a non-defective product. This can improve yield.

[0100] The semi-finished lens 1 after the coating process is blocked in the same manner as in step S202 (step S208). Here too, the semi-finished lens 1 is held by the blocking jig 342 so that the reference position FC becomes the processing origin.

[0101] The lens shape data calculated in step 201 is sent from the design computer 320 to the edging machine 390. The edging machine 390 shapes the semi-finished lens 1 based on the lens shape data (step S209). That is, step S209 is an edging step in which the semi-finished lens 1, on which the concave surface 14 has been machined, is shaped based on the reference position FC.

[0102] In step 201, the edging shape is calculated based on the reference position FC of the frame shape 20a formed by the electrochromic film 20. This reduces the deviation between the edging position and the position of the electrochromic film 20. Therefore, the edging is performed without cutting the electrochromic film 20.

[0103] The above is a description of exemplary embodiments of the present invention. The embodiments of the present invention are not limited to those described above, and various modifications are possible within the scope of the technical concept of the present invention. For example, the embodiments of the present application also include appropriate combinations of examples and modifications explicitly shown in the specification or obvious examples and modifications.

[0104] In the above embodiment, the concave shape and the spherical shape are calculated and processed based on the reference position FC. From the perspective of achieving the purpose of calculating and processing these shapes based on the reference position FC, a semi-finished lens that does not have marks that represent the electrochromic film 20 or the frame shape 20a (specifically, a configuration in which the electrochromic film 20 is omitted from the semi-finished lens 1 shown in FIG. 1) can also be said to fall within the scope of the present invention. [Explanation of symbols]

[0105] 1: Semi-finished lens 10: Lens substrate 20: Electrochromic film 30: Mark 100: Manufacturing Systems 200: Optical store 210: In-store computer 300: Manufacturing factory 310: Host computer 320: Design Computer 330: Measuring instrument 340: Lens Blocker 342: Block jig 350: Curve Generator 360: Polishing machine 370: Washing machine 380: Coating equipment 390:Glass processing machine

Claims

1. A method of manufacturing a semi-finished lens, comprising the steps of: attaching a film having an electrochromic layer between a pair of electrode layers, the film having a frame shape, to the semi-finished lens; measuring the position of the film attached to the semi-finished lens; a mark position determination step of determining the positions of the at least three marks on the semi-finished lens based on actual measured values ​​of the position of the film so that the center position of the frame shape can be identified based on the at least three marks; a marking step of marking each of the at least three marks at the respective positions on the semi-finished lens determined in the mark position determining step; a calculation step of calculating a shape of a non-optical surface of the semi-finished lens based on the center position when the non-optical surface is processed according to a prescription; a surface shape processing step of processing the non-optical surface into the shape calculated in the calculation step, based on the center position; Including, the at least three marks include, when the semi-finished lens is viewed from the optical axis direction, a pair of marks located on a first line passing through the center position, and one mark located on a second line perpendicular to the first line and passing through the center position; A method for manufacturing eyeglass lenses.

2. In the calculation step, an eye point position is calculated taking into consideration the center position, and the shape of the non-optical surface is calculated based on the calculated eye point position. The method for manufacturing the eyeglass lens according to claim 1 .

3. In the marking step, the at least three marks are applied to the optical surface of the semi-finished lens. The method for manufacturing a spectacle lens according to claim 1 or 2.

4. an edging step of edging the lens whose non-optical surface has been processed in the surface shape processing step, with the center position as a reference; Further comprising: The method for manufacturing the eyeglass lens according to any one of claims 1 to 3.

5. In the marking step, the at least three marks are applied to the portion to be cut in the edging step. The method for manufacturing a spectacle lens according to claim 4 .

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