JP4573596B2 - Manufacturing method of spectacle lens - Google Patents

Description

  The present invention relates to a spectacle lens manufacturing method and spectacle lens, and more particularly to a spectacle lens manufacturing method for manufacturing a spectacle lens by engraving and a spectacle lens manufactured by the manufacturing method.

  The progressive multifocal refracting lens has an alignment reference mark, an addition refracting power specifying information mark, a product specifying information mark, and the like for mounting on the frame. The alignment reference mark, the addition power specifying information mark, the product specifying information mark, and the like are engraved by a method that is difficult to identify visually and are called “kakushi marks”.

  In order to give the wearer a sense of incongruity at the center of the lens that is frequently used, the crisp marks such as the alignment reference mark for spectacle lenses are used to view the optical center of a single-focus lens and the long distance of a progressive multifocal lens. It is arranged avoiding the distance portion that is the lens field portion, the near portion that is the lens field portion for viewing a short distance, and the progressive zone portion that is an intermediate portion between the distance portion and the near portion.

  Furthermore, the marking position of the kakushi mark is arranged assuming a general frame frame and spectacle lens wearing state. Normally, the Kakushi mark is placed on the outer periphery about 17 mm from the design center that coincides with the prism measurement point in the case of a single-power lens, and in the case of a progressive-power lens.

  This kakushi mark engraving method imprints on the optical surface transfer surface of the mold that creates the optical surface of the spectacle lens, and transfers the engraving to obtain a convex inscription on the optical surface of the spectacle lens (patent) Reference 1). In addition, a method of directly marking a lens substrate without using a mold is also performed. As a method for marking by directly drawing a kakushi mark on a lens substrate, there are a diamond pen method and a laser marking (Patent Document 2). Furthermore, in addition to drawing directly on the lens substrate, a method of marking on the lens substrate from the coating film is also disclosed (Patent Document 3).

Japanese Patent Laid-Open No. 5-8534 JP 2000-258732 A Japanese Patent No. 3081395

  However, in the case of spectacle lenses, there may be a product defect only in the stamp in the final inspection. In this case, the stamp cannot be erased, so the entire manufactured spectacle lens must be discarded, resulting in a decrease in manufacturing yield. I was invited.

An object of the present invention is to provide a method for manufacturing a spectacle lens capable of improving the manufacturing yield of spectacle lenses by eliminating imprinting defects and taking the above-described circumstances into consideration.
Another object of the present invention is to provide a spectacle lens that can eliminate defects in marking and improve the manufacturing yield.

  According to a first aspect of the present invention, there is provided a method for producing a spectacle lens, wherein a lens base made of a plastic material is formed with an optical surface having a curved surface shape and a surface property satisfying optical specifications of a spectacle lens according to an order. A method of manufacturing a spectacle lens in which an optical surface is engraved with a laser before coating after polishing, and the engraving is formed in a convex shape. The marking is eliminated by processing, and a convex marking is re-formed on the optical surface.

  According to a second aspect of the present invention, there is provided a method for manufacturing a spectacle lens, comprising: forming an optical surface having a curved surface shape and a surface property satisfying optical specifications of a spectacle lens according to an order on a lens base material made of a plastic material; A method of manufacturing a spectacle lens that forms a mark on the optical surface with a laser immediately after polishing of the coating, wherein the mark is formed in a convex shape, and after forming the mark, a coat capable of blocking atmospheric pressure on the optical surface Forming a layer, sealing the marking with the coating layer, and removing the coating layer in the case of the marking failure, heat-treating the spectacle lens substrate to eliminate the marking, and the optical surface In this case, a convex marking is re-formed.

  According to a third aspect of the present invention, there is provided a spectacle lens manufacturing method according to the first aspect, wherein the marking is formed by a laser marking device that irradiates a laser having an infrared light wavelength. is there.

According to a fourth aspect of the present invention, there is provided a spectacle lens manufacturing method according to the first or second aspect, wherein the laser is a CO ₂ laser.

  According to a fifth aspect of the present invention, there is provided a method for manufacturing a spectacle lens according to the first aspect of the present invention, wherein the heat treatment is performed at a temperature of 80 ° C to 120 ° C. .

  A spectacle lens manufacturing method according to a sixth aspect of the invention is characterized in that, in the invention according to any one of the first to fifth aspects, the heat treatment is performed for 50 minutes to 90 minutes.

  According to a seventh aspect of the present invention, there is provided the method for manufacturing a spectacle lens according to the first aspect of the present invention, wherein the marking is a kaku mark that is difficult to identify visually. Is.

  According to the first to seventh aspects of the present invention, in the case of imperfect marking, the spectacle lens base material is heat-treated to eliminate the marking, and the convex marking is re-formed on the optical surface of the spectacle lens base material. As a result, even if the stamp is defective, a new stamp can be easily re-formed, so that it is not necessary to discard the manufactured spectacle lens due to the defective stamp, and the manufacturing yield of the spectacle lens can be improved. .

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is an overall view showing a progressive-power lens engraved with various related information in an embodiment of a spectacle lens according to the present invention. FIG. 2 is an overall view showing a spectacle lens manufacturing system for carrying out an embodiment of a spectacle lens manufacturing method according to the present invention.

  In this spectacle lens manufacturing system, first, an ordering terminal 30 of a spectacle store 35 and a main frame 39 are connected via a communication line 31. The ordering terminal 30 is arranged in a spectacle store 35 as an ordering source. The main frame 39 is disposed in a factory 38 on the spectacle manufacturer side. On the factory 38 side, a factory server 40 is connected to the main frame 39 via the LAN 32, and a computer terminal 44 of a laser marking device 41 is connected to the factory server 40.

  The ordering terminal 30 of the spectacle store 35 supports and displays input of various data necessary for ordering spectacle lenses. The input unit of the ordering terminal 30 can input prescription value data 36 of the eye to be examined. A frame measuring device for measuring the frame shape of the spectacle frame is connected to the input unit of the ordering terminal 30, and the frame shape data 37 is input to the ordering terminal 30. The prescription value data 36, the frame shape data 37, and the like input to the ordering terminal 30 are transmitted to the main frame 39 of the factory 38 through the public line 31. The transmitted frame shape data 37 and prescription value data 36 are stored in the main frame 39 as order data.

  The main frame 39 acquires the prescription value data 36 and the like from the ordering terminal 30 and designs the spectacle lens so as to conform to the prescription value. The main frame 39 stores a spectacle lens design program, a processing data generation program, and the like.

  The design program has a function of creating design data for each spectacle lens based on the acquired prescription value data 36. The processing data generation program realizes a function of generating processing data necessary for the lens processing apparatus to perform actual lens processing based on the design data created by the design program. This processed data includes spectacle lens surface design data, frame shape data 37, prescription value data 36, and the like.

  The main frame 39 generates processing data as control information for the lens processing apparatus by executing the spectacle lens design program and the processing data generation program, and transmits the generated processing data to the factory server 40. The factory server 40 stores the processing data together with the order number of the order data. For each processing data to be stored, a serial number used only in the manufacturing factory is given for each order data for identification, and is associated with each processing data.

  The laser marking device 41 acquires processing data from the factory server 40 via the LAN line 32, and stamps various related information described later on the spectacle lens based on the processing data. FIG. 1 is an overall view showing a progressive-power lens 20 which is a spectacle lens. The progressive-power lens 20 is engraved with spectacle lens related information, spectacle frame frame related information, prescription values and layout related information, and manufacturing related information.

  The spectacle lens-related information includes, for example, product specifying information 11 for specifying the manufacturer and product name of the progressive addition lens 20, material refractive index specifying information 17, and the like. The spectacle frame frame-related information includes, for example, a boxing area mark 8 that is a rectangle (one form of a quadrangle) in which the lens shape of the frame frame in the spectacle frame is inscribed. As prescription values and layout-related information, for example, alignment reference marks 9 and 10 serving as a reference position when the progressive power lens 20 is put into a spectacle frame, progressive band length specifying information 16, additional refractive power specifying information 18, Measurement definition method specifying information 19 or the like that defines a method of measuring the addition power.

  As manufacturing related information, for example, block reference position marks 1 to 3 serving as a reference position for blocking, reblocking reference position marks 4 to 6 serving as a reference position when blocking again by reprocessing such as re-polishing, orders received or Manufacturing number information 12 that indicates a manufacturing number that is a manufacturing unique number and right and left sections, and individual manufacturing instruction information 13 that displays special manufacturing instruction contents that are applied only to the progressive addition lens 20 are engraved.

  In FIG. 1, reference numeral 14 denotes a horizontal reference line of the progressive-power lens 20, reference numeral 15 denotes a vertical meridian passing through the design center of the progressive-power lens 20, and reference numeral 7 denotes the progressive-power lens. Reference numeral 20 denotes the target lens shape of the frame frame. However, the horizontal reference line 14, the meridian 15 passing through the design center, and the lens shape 7 of the frame are shown for convenience of explanation, and are not actually imprinted on the progressive addition lens 20. .

  1 is a right eye lens in which the left side is the ear side and the right side is the nose side, and the lens shape 7 and the boxing area mark 8 of the frame frame are , It is centered along the horizontal reference line 14 toward the nose side. Note that the left-eye lens has a layout in which the respective components of the right-eye lens are symmetrical with respect to a vertical line (meridian) 15 passing through the design center, and thus illustration thereof is omitted.

  The two alignment reference marks 9 and 10 shown in FIG. 1 are symmetrically attached on the horizontal reference line 14 of the progressive addition lens 20 with a vertical line (meridian) 15 passing through the design center. That is, the two alignment reference marks 9 and 10 are imprinted at positions on the horizontal reference line 14 and equidistant from a vertical line (meridian) 15 passing through the design center of the progressive addition lens 20. These alignment reference marks 9 and 10 are imprinted at positions that remain on the surface of the progressive-power lens 20 even after the progressive-power lens 20 is framed in the spectacle frame. Specifically, the distance from the vertical line (meridian) 15 passing through the design center of the progressive addition lens 20 to the alignment reference marks 9 and 10 is set to 17 mm, for example.

  In the vicinity of the alignment reference marks 9 and 10, the product specifying information 11, the progressive zone length specifying information 16 indicating the length of the progressive zone, and the material refractive index specifying information 17 that is the material refractive index of the progressive addition lens 20. The addition power specifying information 18 which is the near addition power of the lens 20 and the measurement definition method specifying information 19 are engraved. Specifically, the product specifying information 11, the progressive zone length specifying information 16, and the material refractive index specifying information 17 are imprinted below in the vicinity of the alignment reference mark 10 on the ear side, and the addition specifying information 18 and the definition method specifying information 19 Is imprinted on the lower side close to the alignment reference mark 9 on the nose side. The inscriptions 9, 10, 11, 16, 17, 18, and 19 are all kakushi marks. The kakushi mark is engraved by a method that is difficult to identify visually, and is engraved in a region surrounded by the target lens shape 7 in consideration of the target lens shape 7 of the frame frame. Therefore, even after the frame lashing process, these kaku marks remain on the optical surface of the progressive addition lens 20 and can be identified.

  Further, the progressive addition lens 20 is engraved with a high-density mark that can be easily identified visually in addition to the above-mentioned kakushi mark. The high density mark has three functions. The first function is an index display of a block reference position for concave processing performed after convex surface polishing. The second function is the display of the area that is scraped off by lashing. The third is display of manufacturing related information.

  As shown in FIG. 1, the block reference position marks 1 to 3 serving as blocking reference positions for concave processing are imprinted with high-density marks. The block reference position marks 1 and 3 are on the horizontal reference line 14 and are arranged 1 mm inside from the outermost peripheral portion of the progressive-power lens 20 and are marked with a cross. The block reference position mark 2 is arranged 1 mm inside the lens outer periphery on a vertical line (meridian) 15 passing through the design center of the progressive addition lens 20, and is marked with a cross. A boxing area mark 8 for identifying an area lost due to the stabbing process is engraved on the outer side of a rectangle 1 mm outside the rectangle inscribed by the frame shape of the frame of the spectacle frame.

  Further, the progressive-power lens 20 is engraved with the high-density mark on the re-blocking reference position marks 4 to 6 as manufacturing-related information, which becomes a reference position when blocking again by re-processing such as re-polishing. Is done. These re-blocking reference position marks 4 and 6 are on the horizontal reference line 14 and are arranged 2 mm outside the boxing area mark 8 and are engraved in a circle. The re-blocking reference position mark 5 is arranged at a position 2 mm outside the boxing area 8 on a vertical line (meridian) 15 passing through the design center, and is marked with x.

  Further, the progressive power lens 20 is marked with a high density mark below the boxing area 8 with the manufacturing number information 12 as manufacturing related information, which is a right and left division and an order or manufacturing unique number. Further, the individual manufacturing instruction information 13 as manufacturing related information for displaying special manufacturing instruction contents that are applied only to the progressive power lens 20 is arranged below the manufacturing number information 12 and is imprinted with a high density mark. The

  Further, the progressive addition lens 20 shown in FIG. 1 is a so-called round lens before processing the ball, but all information 1, 2, 3, 4, 5, 6, 8, 12, and 13 of the high-density marking are stored in glasses. It exists in the area | region outside the target lens shape of the frame frame in a frame. Therefore, these high-density marks do not remain on the lens surface of the progressive addition lens 20 after the frame processing, and therefore do not hinder the visual field of the spectacle lens wearer.

  Next, the above-described blocking reference position marks 1 to 3, re-blocking reference position marks 4 to 6, boxing area mark 8, alignment reference marks 9 and 10, product specifying information 11, serial number information 12, individual manufacturing instruction information 13, The laser marking device 41 for marking the progressive zone length specifying information 16, the material refractive index specifying information 17, the addition power specifying information 18, and the measurement definition method specifying information 19 will be described. As shown in FIG. 2, the laser marking device 41 includes a computer terminal 44, a laser oscillation unit 45, and a mounting table position control unit 46.

  All requests for information in the manufacturing process to the factory server 40 executed by the computer terminal 44 are made via the manufacturing number information. When the computer terminal 44 of the laser marking device 41 receives the manufacturing number information of the manufacturing order attached to the unprocessed lens or a bar code including the manufacturing number information by an input device such as a scanner, the computer terminal 44 displays the manufacturing number information. Processing data for creating the corresponding marking position related information (that is, spectacle lens related information, spectacle frame frame related information, prescription value and layout related information, and manufacturing related information) is requested to the factory server 40. The factory server 40 transmits the processing data according to the request. The processed data to be transmitted includes spectacle lens surface design data, frame shape data, and prescription value data. The processed data is a combination of a marking type and a three-dimensional coordinate value (x, y, z) as will be described later.

  The processing data transmitted from the factory server 40 is sent via the LAN line 32 to the communication control unit 42 of the computer terminal 44 in the laser marking device 41. In the computer terminal 44, the arithmetic processing unit 43 calculates the details of the data for marking from the received processed data. The contents of the calculation results are stamped positions 1,2,3,4,5,6,8,9,10,11,12,13,16,17,18,19, laser output value, stamping speed. Value, the number of times of repeated marking, and is specified for each marking.

  As shown in FIGS. 2 and 8, the laser oscillation unit 45 oscillates a laser for engraving. The laser oscillator 50 as a constituent element thereof has a focal length of 145.00 mm, and the oscillation laser is a CO 2 laser class 4. The laser oscillation output oscillates a CO2 laser which is a laser having an infrared light wavelength of oscillation output maximum 30 [W], average 12 [W], issue peak wavelength 10.6 [μm]. The laser beam is controlled by a galvano scanning method, a printing range of 90 mm × 90 mm, a character size of 0.2 mm to 90 mm, and a scanning speed of 3000 mm / s.

  The spot of the diverging laser or parallel laser 51 emitted from the laser oscillator 50 is enlarged by a beam expander 52, and the direction thereof is changed by a pair of reflectors 53 and 54, and a condensing lens (eg, fθ lens). ) 55 is focused so as to converge at a predetermined marking position on the surface of the progressive-power lens 20, and is converged and irradiated to the marking position of the progressive-power lens 20 through the laser oscillation port 56. Therefore, the engraving is performed by deforming the surface of the lens substrate or the vicinity of the lens substrate by melting or alteration or the like by the energy of the irradiated laser 51 or by expansion. That is, the refractive index, the transmittance, and the like of the part that has been melted or altered are different from those of other parts and can be identified from the outside, and function as a mark.

  In the laser oscillation unit 45, one of the pair of reflectors 53 and 54 is for the X direction, and the other is for the Y direction. By controlling the postures of the reflecting plates 53 and 54, the laser spot position can be arbitrarily scanned on the surface of the progressive addition lens 20. In this way, by tracing the laser spot along the characters and figures on the surface of the progressive addition lens 20, the information 1, 2, 3, 4, 5, 6, 8, 9, 10 , 11, 12, 13, 16, 17, 18, 19 are marked on the progressive-power lens 20.

  The mounting table position control unit 46 holds the progressive addition lens 20 to be engraved on the mounting table 57 and moves the mounting table 57. Due to the movement of the mounting table 57, the distance between the laser oscillation port 56 of the laser oscillation unit 45 in the fixed state and the marking position of the progressive addition lens 20 is the distance for the laser irradiated from the laser oscillation port 56 to converge ( For example, the laser from the laser oscillation port 56 is condensed at the marking position of the progressive addition lens 20 on the mounting table 57, and a desired symbol or the like is marked.

  The mounting table position control unit 46 moves the mounting table 57 in the X direction and the Y direction that are orthogonal to each other as indicated by reference numeral 99 in FIG. 8 and in the Z direction that is the vertical direction, and in the horizontal direction. There is a case where it is moved in a certain X direction and a Z direction which is a vertical direction and is not moved in the Y direction. In the present embodiment shown in FIGS. 3 to 9, the latter example is shown. In the present embodiment, the marking position in the Y direction of the progressive addition lens 20 is realized by the minute movement in the Y direction by the reflecting mirror 54, similarly to the minute movement in the X direction by the reflecting mirror 53 in the laser oscillator 45. .

  As shown in FIGS. 4 to 6, in the mounting table position control unit 46, an X-direction rail 60 is laid in a horizontal direction (X direction) on a base 58 via a base plate 59. An X-direction moving table 81 is slidably disposed on the direction rail 60 via a slider 80. The drive screw shaft 82 is screwed into the nut portion 85 of the X-direction moving table 81. The drive screw shaft 82 is rotationally driven via a coupling 84 by a stepping motor 83 installed on the base plate 59.

  A vertical support member 86 is erected on the X-direction moving table 81, and a Z-direction rail 87 is installed on the vertical support member 86 so as to extend in the vertical direction. A direction moving table 93 is slidably disposed. The mounting table 57 is attached to the Z-direction moving table 93, and the drive screw shaft 90 is screwed to the nut portion 89 of the Z-direction moving table 93. The drive screw shaft 90 is rotationally driven via a coupling 92 by a stepping motor 91 installed on the vertical support member 86.

  Therefore, by driving the stepping motor 83, the mounting table 57 is moved in the horizontal direction (X direction) via the driving screw shaft 82 and the X direction moving table 81, and by driving the stepping motor 91, the driving screw shaft 90 and the Z direction are moved. The mounting table 57 is moved in the vertical direction (Z direction) via the moving table 93. In addition, the code | symbol 94 of FIG.4 and FIG.5 is a bearing. Reference numeral 95 denotes a spring member 95 for lifting and supporting the mounting table 57 and the Z-direction moving table 93 on the vertical support member 86.

  As shown in FIG. 7, the mounting table 57 is provided with a vertical reference surface 96, a horizontal reference surface 97, and a rotation reference shaft 98 for holding the progressive addition lens 20. Further, for the progressive-power lens 20 placed on the mounting table 57, a Yatoi 70 as a lens holding member shown in FIG. It is joined. As the bonding agent 74, wax or a low melting point alloy is preferable. The Yatoi 70 has a cylindrical vertical reference surface 72A, a flat horizontal reference surface 72B, and a rotation reference surface 73 extending in the diameter direction on the bottom surface.

  In a state where the progressive addition lens 20 is mounted on the mounting table 57 via the Yatoi 70, the vertical reference surface 72A and the horizontal reference surface 72B of the Yatoi 70 are used as the vertical reference surface 96 and the horizontal reference surface 97 of the mounting table 57, respectively. The rotation reference surface 73 of the yatoy 70 is fitted and contacted with the rotation reference shaft 98 of the mounting table 57. Accordingly, in the marking process on the progressive power lens 20, the processing reference positions are the vertical reference surface 72 A, the horizontal reference surface 72 B, and the rotation reference surface 73 of the yatoy 70.

  The correction relating to the marking accuracy of the laser marking device 41 is performed so that the marking position on the progressive optical power lens 20 and the center position of the laser irradiated from the laser oscillation unit 45 coincide with each other when the laser marking device 41 is assembled. For fine adjustment that is adjusted but cannot be mechanically adjusted, the coordinate value of the stamping reference position is corrected by software.

FIG. 13 is a method for manufacturing a spectacle lens including an inscription (mark) according to an embodiment of the method for manufacturing a spectacle lens according to the present invention.
The outline is as follows. First, in order to form an optical surface having an optical specification conforming to the order data from the spectacle store 35 (FIG. 2) as the ordering source, on the lens blank 71 (FIG. 9) which is the lens base material of the spectacle lens. Then, grinding and polishing are performed to create the convex optical surface. Next, on the optical surface having the curved surface shape and the surface property satisfying the optical specifications, immediately after the polishing process (that is, after coating after the polishing process and before coating), laser marking (1, 2, 3, 3) is performed using a laser marking device 41. 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16, 17, 18, 19). When this mark is a kakushi mark (information on 9, 10, 11, 16, 17, 18, 19) that is difficult to identify visually, the mark is formed in a convex shape as will be described in detail later. . After the formation of the above-mentioned stamps (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16, 17, 18, 19), the stamps were formed. A coating layer capable of blocking atmospheric pressure is formed on the optical surface of the lens blank 71, and the above-mentioned marking is sealed with this coating layer.

  However, when the marking is defective and found to be defective, the coating layer (photochromic coating, hard coating coating, and antireflection coating) is removed from the optical surface of the lens blank 71, and the marking is heated to process the lens blank. All the markings are erased from the optical surface 71, and the markings are reprocessed on the optical surfaces.

  In the present embodiment, the lens blank 71 as the lens substrate is a synthetic resin substrate, for example, a copolymer of methyl methacrylate and one or more other monomers, diethylene glycol bisallyl carbonate and one or more other monomers. Copolymer, polycarbonate, polystyrene, polythiourethane, spilled resin utilizing ene-thiol reaction, vinyl polymer containing sulfur, and the like, but are not limited thereto. Further, the lens base material is preferably a plastic lens base material, more preferably a plastic lens base material for spectacles.

When manufacturing the progressive addition lens 20 which is a spectacle lens, as shown in FIG. 3, first, concave side blocking for convex surface processing is performed (S1).
That is, in the cutting or polishing process of the lens blank 71 (FIG. 9), which is a lens base material, the non-processed surface of the lens blank 71 is fixed to the yato 70 as the lens protection member by using the bonding agent 74. The progressive power lens 20 is attached to the cutting machine or the polishing machine via Here, fixing the lens blanks 71 to the yatoy 70 via the bonding agent 74 is called blocking or block.

  FIG. 10 shows a concave surface blocking device 100 for blocking the concave surface side of the lens blank 71. First, the concave block is provided with a centering mechanism 102 around the lifting member 101 on which the lens blanks 71 are installed, so that the geometric center of the lens blanks 71 coincides with the center of the lifting member 101. In the centering mechanism 102, a rotating base ring 103 and a fixed base ring 104 are sequentially arranged around the push-up member 101, and three clamps 106 are pivotally supported on the fixed base ring 104 by using fixed pins 105, A movable pin 108 fixed to the rotating base ring 103 is inserted into the long hole 107 of each clamp 106.

  When the rotation base ring 103 is rotated by driving an air cylinder (not shown), the movable pin 108 of the rotation base ring 103 presses the clamp 106 through the long hole 107 of the clamp 106, and the three clamps 106 are fixed pins. Rotate inward about 105. As a result, the clamp pins 109 erected on each clamp 106 press the edge surface of the lens blank 71 to center the lens blank 71. Next, a predetermined amount of wax as a bonding agent is dropped onto the concave surface of the lens blank 71 while the push-up member 101 is raised and the lens blank 71 is pushed up. Thereafter, the yatoy 70 is lowered to press and expand the wax. When the wax is solidified, the lens blanks 71 are blocked by the yatoy 70. FIG. 9 shows the lens blanks 71 and the Yatoi 70 after the block. The processing reference positions after the block are the reference surfaces 72A, 72B, and 73 of the same Yatoi 70 through the convex grinding process and the convex polishing process until the marking process is completed.

Next, the convex surface cutting shown in FIG. 3 is performed (S2).
A curve generator is used to create a curved surface (convex surface) constituting the optical surface of the progressive addition lens 20. The curve generator according to the present embodiment is an NC-controlled cutting device that creates a curved surface shape for machining purposes by computer-controlling the position of the cutting blade along the curved surface shape for creation purposes. The lens blanks 71 of the progressive-power lens 20 are fixed to the processing device via the yatoi 70. The machining reference positions at this time are the reference surfaces 72A, 72B, and 73 (FIG. 9) of the yatoy 70 blocked in step S1.

Next, the convex surface polishing shown in FIG. 3 is performed (S3).
After the convex surface of the lens blanks 71 is cut into a predetermined shape by the curve generator, the lens blanks 71 are attached to a polishing apparatus via the same Yatoi 70, and the cut surface is polished. At that time, the lens blanks 71 and the yatoy 70 are polished on the convex surface side while being joined. The processing reference positions at this time are the reference surfaces 72A, 72B, and 73 (FIG. 9) of the same Yatoi 70 as those used during grinding.

  After the convex surface polishing is completed, the progressive power lens 20 is engraved using the laser engraving device 41 (S4). The processing data for the marking process is stored in the factory server 40 (FIG. 2), and this processing data is captured by the computer terminal 44 of the laser marking apparatus 41. The processing data includes, for example, spectacle lens surface design data, frame shape data, prescription value data, and the like. Since an actual spectacle lens such as the progressive addition lens 20 has a curved surface instead of a flat surface, the surface design data and frame shape data of the spectacle lens are represented by three-dimensional spatial coordinate values. Although FIG. 1 is a plan view, for the sake of explanation, the spatial coordinates of the lens are represented by an XYZ orthogonal coordinate system, the horizontal reference line 14 of the lens is the X axis, the meridian 15 passing through the design center of the lens is the Y axis, The direction from the back surface to the front surface and perpendicular to the paper surface is taken as the Z axis. The arithmetic processing unit 43 of the computer terminal 44 of the laser marking device 41 includes the three-dimensional curved surface data (x, y, z) of the above-described spectacle lens surface design data and the two-dimensional marking arrangement position (x ′, y ′) in FIG. From these, the three-dimensional spatial coordinates (x ′, y ′, z ′) on the spectacle lens (progressive power lens 20) of all the marking marks are calculated, and these are set as the marking positions. FIG. 1 shows a basic two-dimensional arrangement of each inscription.

  The laser oscillation unit 45 irradiates the marking position calculated by the arithmetic processing unit 43 of the computer terminal 44 with a laser. The processing reference positions of the coordinates on the lens surface in this engraving processing are the reference surfaces 72A and 72B (see FIG. 9) of the yatoy 70 attached to the progressive addition lens 20 in the horizontal direction (X, Y) and the vertical direction (Z). ), And the rotation direction around the geometric center of the progressive-power lens 20 is the reference plane 73 of the Yatoi 70. Accordingly, the laser marking device 41 accurately irradiates the marking position represented by the three-dimensional position coordinates calculated as described above on the progressive addition lens 20 on the basis of the reference surfaces 72A, 72B and 73. That is, in the engraving process, the process reference position is the reference surfaces 72A, 72B, and 73 of the Yatoi 70 that are the same as the grinding process and the polishing process.

  Of the marking marks imprinted on the convex surface of the progressive-power lens 20 by laser irradiation, the boxing area mark 8 is for identifying a region lost due to lashing as shown in FIG. It is a rectangle inscribed in the target lens shape of the frame in the frame. The rectangular boxing area mark 8 includes a straight line as a side constituting the rectangle.

  Here, in the present embodiment, suitable conditions for marking the information 1,2,3,4,5,6,8,9,10,11,12,13, 16,17,18,19 Is described next. The marking processing conditions for the blocking reference position marks 1 to 3 were set such that the marking output was 35% of the maximum value of 30 W, the marking speed was 450 mm / s, and the number of times the same location was duplicated was twice. Further, the marking conditions of the re-blocking reference position marks 4 to 6, the boxing area mark 8, the production number information 12 and the individual production instruction information 13 are the same, the marking output is 35% of the maximum value 30 W, the marking speed is 450 mm / s. The number of times of overlapping marking was set to one.

  Further, the marking processing conditions of the alignment reference marks 9 and 10, which are kakushi marks, the product specifying information 11, the added refractive power specifying information 18 and the progressive zone specifying information 17 are as follows. In the Kakshi mark stamping process on No. 6 IAS substrate, the laser output is 5.225% of the maximum output 30W, the stamping speed is 600 mm / s, and the number of stamping at the same location is six. In addition, the Kakishi mark engraving on an EYYA base material with a refractive index of 1.7 made by HOYA Co., Ltd. is also suitable, with a laser output of 5.4% of the maximum output of 30 W, an engraving speed of 530 mm / s, and the number of engravings at the same location of 6 . It is more preferable to set a time interval in which the marking is not performed at least once or more during the overlapping marking of the same portion. Specifically, in the above-described example, when performing the 6-time overlap marking, first, 3 times the time-over marking is continuously performed, and a time interval of about 0.1 seconds to 3 seconds is set, and then the remaining 3 times. Make a double stamp. By setting the time interval, it is possible to minimize a situation in which the lens base material is deformed by heat at the time of forming the stamp.

  The marking height immediately after the marking is 0.5 to 0.8 microns, and the line width is 180 to 280 microns. In the stamp measurement data 110 of FIG. 11, it is about 0.552 microns.

  The laser marking device 41 forms the marking of the kakushi mark (information on 9, 10, 11, 16, 17, 18, and 19) as a marking raised in a convex shape. The details of this mechanism are not clear, but are presumed as follows.

  When a laser beam with sufficiently weak energy is irradiated on the optical surface of the lens blank 71 as a lens base material and in the vicinity of the inside of the optical surface, the irradiation energy is small. Therefore, the lens blank 71 (lens base material) is bonded to the polymer. Is partially heated without being cut. A portion of the heated lens blank 71 undergoes thermal expansion and rises above the optical surface. A portion of the heated and expanded lens blank 71 comes into contact with the outside air, and the surface of the expanded portion is cooled. After the surface of the inflating part is cooled, the inside of the lens blank 71 is cooled and approaches the room temperature and becomes stable. However, since the raised shape part is cooled earlier than the inside, the surface of the inflated part, which is the engraving surface, remains in a raised shape, while the inside is cooled and contracts, forming a space inside. Is done. The refractive index changes depending on this space, and the curvature of the marking surface differs greatly from the curvature around the marking, so that it can be visually recognized as a kakushi mark.

  The important factors here are the laser wavelength and the total power. In general, bonds between molecules or atoms are made by each bond called an energy band. This energy band becomes unstable when high-energy photons are irradiated, and bonds are likely to be broken. Here, high energy refers to the case where the energy level of each photon is high, such as ultraviolet rays. Even if the total output of the irradiated laser is small, the bond is likely to break down, and the irradiated substance sublimates. Cheap. On the other hand, when the energy level of each photon is low, such as infrared rays, the bond between molecules or atoms is difficult to break if the laser output is small, and the total energy irradiated by the laser is sufficiently large. Otherwise, sublimation is unlikely to occur. Therefore, the convex marking in the present embodiment is suitable for laser irradiation with a weak output, but is more suitable for irradiation with a CO2 laser having a wavelength in the infrared region with a small output.

  In the conventional laser engraving, a portion irradiated with a laser is heated to sublimate the material in the irradiated region to form a concave shape from which the material has been removed. In the case where the material in the stamped region is removed to form a concave shape, the material at the time of sublimation remains in the concave shape stamp and its surroundings. In the marking of the kakushi mark (information on 9, 10, 11, 16, 17, 18, 19) of the present embodiment, the material in the irradiation area is formed in a convex shape without sublimation, thereby preventing the scattering of the residual material. Therefore, the substance in the laser light irradiation region is enclosed in the convex marking without being sublimated.

  By the way, since the inside of the marking of the above-mentioned kakushi mark formed in a convex shape is a space, for example, when it is reheated at a temperature of 90 ° C. or more, the surface and the inside constituting the marking become unstable, and the internal space The portion cannot withstand the external air pressure, and the raised surface of the stamped convex portion is pushed back to the state before thermal expansion. When the internal space disappears and the convex marking disappears, the stamped portion becomes stable. This is equivalent to the state before marking, and as a result, the visible marking disappears.

  Therefore, as will be described later, the optical surface of the lens substrate on which the marking is formed is coated to seal the marking. Then, even if the inscription sealed with this coating is subsequently subjected to heat treatment (for example, heat treatment at a temperature of up to about 120 ° C.), the coating film itself blocks a part of the atmospheric pressure, and the space inside the inscription is made. maintain. Therefore, the stamped shape can be maintained to some extent even after the heat treatment, and the amount is about 40% in the height of the stamp in this embodiment. Further, when the coating film once coated is removed and reheated, the stamp mark disappears due to the above-described reason.

  After the above-described marking process on the optical surface of the convex surface, a holding member removing operation for removing the yatoy 70 is performed. The lens blanks 71 engraved on the convex surface separates the lens blanks 71 and the yatoy 70 by peeling off the concave side bonding agent 74.

  Next, as shown in FIG. 13, a photochromic film is applied and cured on the optical surface of the lens blanks 71, which is the engraved lens base material (S5). In other words, the optical surface including the engraving (1,2,3,4,5,6,7,8,9,10,11,12,13,16,17,18,19) is sealed with a photochromic coating To do. The engraved seal is further sealed by a hard coating process and an antireflection film coating process in a subsequent process (S6). Kakushi mark engraving (information on 9,10,11,16,17,18,19) after anti-reflective coating is about 40% less in height and 0.2-0.6 microns in height ( The line width is preferably 100 to 300 microns (preferably 180 to 280 microns). In the measurement data 111 of the mark marking shown in FIG. 12, the line width is 230 microns and the height is 0.26 microns.

  The film thickness of the photochromic film is about 30 microns. Further, the hard coating film coated on the photochromic film has a film thickness of about 3 microns, and the antireflection film coated on the hard coating film has a film thickness of several hundred nanometers. These photochromic film, hard coating film and antireflection film constitute a coating layer capable of blocking a part of atmospheric pressure.

  In general, photochromic lenses have a dimming function that has a reversible action that changes color quickly in response to light including ultraviolet rays such as sunlight and returns to the original color (colorless state) when there is no ultraviolet rays. This lens is used in a plastic spectacle lens. This photochromic lens is manufactured by a method such as impregnation or inclusion of a photochromic preparation into a lens base material, coating of the photochromic preparation on the surface of the lens base material, or the like. In the present embodiment, a method of obtaining a light control function by coating a photochromic preparation on the surface of a lens substrate is used.

  The material for the photochromic film is obtained by dissolving a photochromic compound in a radical polymerizable monomer. Furthermore, it is preferable that the radical polymerizable monomer includes components of an organosilicon compound having a silanol group and an epoxy group, an amine compound, and a photopolymerization initiator.

The photochromic coating solution (photochromic preparation) is adjusted as follows.
In a plastic container, a trimethyl propane polymethacrylate polymerization part, a BPE oligomer (2,2-bis (4-methacryloyloxypolyethoxyphenyl) propane) part by weight, BE6E (polyester oligomer hexaacrylate) part by weight, an average molecular weight of 532 3 parts by weight of chromene as a photochromic dye and antioxidant LS765 (bis 1,2,2,6,6-pentamethyl) in parts by weight of a radical polymerizable monomer consisting of parts by weight of polyethylene glycol diacrylate and glycidyl methacrylate -4-pipezyl) sebacate, methyl (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate 5 parts by weight, CGI-184 (1-hydroxycyclohexyl phenyl ketone) as an ultraviolet polymerization initiator 4 parts by weight, and CGI403 (bis (2,6-dimethoxy) Benzoyl-2,4,4 trimethylpentylphosphine oxide)) was added to 0.1 parts by weight, and the mixture was sufficiently stirred and mixed. 6.4 parts by weight of methoxysilane (KBM403 manufactured by Shin-Etsu Chemical Co., Ltd.) was added dropwise with stirring. After sufficiently stirring, 1.4 polymer parts of N-methyldiethanolamine were weighed and dropped, and further sufficiently stirred and mixed. After that, after further adding 0.1 parts by weight of silicone leveling agent Y-7006 (polyoxyalkylene / dimethylpolysiloxane copolymer: manufactured by Nihon Unicar Co., Ltd.), a rotation revolution type stirring deaerator (Shinki Co., Ltd.) -A curable composition having photochromic properties was obtained by defoaming for 2 minutes using AR-250).

Using the photochromic coating solution, a photochromic film is formed as follows.
Polythiourethane (trade name EYES, center wall thickness: 2.0mm thickness, manufactured by HOYA Co., Ltd.) as a plastic lens base material is immersed in an aqueous solution of sodium hydroxide at 60 ° C and 10% by weight for 5 minutes to thoroughly clean and dry. Then, the substrate convex surface side was coated by spin coating using the prepared curable composition. This treated lens is irradiated with 1800 mJ / cm2 (100 mW / cm2, 3 minutes) with a UV integrated UV light (D bulb) with a wavelength of 405 nm in a nitrogen atmosphere (oxygen concentration of 500 ppm or less), and further at 110 ° C. for 60 minutes. Curing was performed to obtain a plastic lens having a photochromic film layer.

  The material for the hard coat film is not particularly limited, and a coating composition comprising a known organosilicon compound and metal oxide colloidal particles can be used. Examples of the organosilicon compound include an organosilicon compound or a hydrolyzate thereof, and an organic compound having a glycidoshi group, an epoxy group, a vinyl group, a methacryloxy group, an acryloxy group, a mercapto group, an amino group, a phenyl group, or the like. It is preferable to include a component of a group, an alkyl group having 1 to 6 carbon atoms, or an aryl group having 6 to 10 carbon atoms.

The hard coating solution is adjusted as follows.
Add 141 parts by weight of water-dispersed colloidal silica (solid content 40% by weight, average particle size 15 millimicrons) to a glass container equipped with a magnetic stirrer, add 30 parts by weight of acetic acid while stirring, and mix thoroughly. Stirring was performed. Thereafter, 74 parts by weight of γ-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd.) was added dropwise and stirred at 5 ° C. for 24 hours. Next, 100 parts by weight of propylene glycol monomethyl ether, 150 parts by weight of isopropyl alcohol, 0.2 part by weight of a silicone-based sea surface activator, and 7.5 parts by weight of aluminum acetylacetonate as a curing agent were added, and after sufficient stirring, filtration was performed. To prepare a hard coating solution.

A hard coat film is formed as follows using the hard coating solution.
For example, a dipping method, a spin method, a spray method, a bubble jet (registered trademark) method, an ink jet method and the like are usually applied as a method of applying a hard coating liquid that is a curable composition. The spin coating method is preferable from the viewpoint of accuracy. The hard coat film was formed by immersing a plastic lens having a photochromic film in an aqueous solution of sodium hydroxide at 60 ° C. and 10% by weight for 5 minutes, thoroughly cleaning it, drying it, and then preparing the hard coating film. The composition was coated on the photochromic film on the optical surface of the lens blank 71 using a dipping method (pickup speed 20 cm / min), and was hardened by heating at 110 ° C. for 60 minutes to form a hard coat film.

  The following antireflection coating is formed on the optical surface of the lens blank 71 having the obtained hard coat coating. The lens blanks 71 having a hard coat film is put into a vapor deposition machine, heated to 85 ° C. while being evacuated, evacuated to 2.67 × 10 −3 Pa, and then deposited by an electron beam heating method to laminate SiO 2 and ZrO 2 An antireflection coating having a structure (λ / 4, λ / 2, λ / 4; λ is a wavelength) is formed.

  After the formation of these coating layers (photochromic film, hard coating film, antireflection film), optical and surface inspections are performed as shown in FIG. 13 (S7). The completed progressive-power lens 20 is subjected to visual appearance inspection, power inspection with a lens meter, projection inspection of the inner surface of the lens with transmitted light of a zircon lamp, and optical performance inspection of astigmatism on the entire lens surface. Further, a defect of the marking formed on the optical surface is also inspected.

  If it is determined that there is no defect in this inspection (S8), the passed progressive-power lens 20 is glazed according to the frame shape of the spectacle frame (S9) and framed in the frame frame. The eyeglass lens is completed (S10) and shipped.

If it is determined in the final inspection that there is a defect in the stamp, first, the progressive power lens 20 is coated with a coating layer (photochromic film, hard coating film and antireflection film) coated on the optical surface of the progressive power lens 20. (S11).

  Next, the progressive-power lens 20 (lens blank 71) from which the coating layer has been removed is heat-treated at a heating temperature of 80 to 120 ° C. (for example, 90 ° C.) for 50 to 90 minutes (for example, 60 minutes). All the markings are erased from the optical surface of the lens 20 (lens blank 71) (S12). No other physical or chemical treatment is performed on the progressive-power lens 20 (lens blank 71).

  After that, the progressive power lens 20 is manufactured by performing the marking process after Step S4, the formation of the coat layer, and the like.

  Here, immediately after the formation of the marking in step S4, if a defect in the marking content is found, the above heat treatment (heating temperature 80 to 120 ° C., without forming the coating layer in step S5 and step S6, A heating time of 50 to 90 minutes is performed, and all the markings on the optical surface of the lens blank 71 are extinguished, and the marking is reworked.

With the configuration as described above, the following effects (1) to (11) are achieved according to the above embodiment.
(1) The conventional laser marking has a concave shape obtained by sublimating the material at the marking position. However, when laser marking is performed after polishing, the sublimation material of the lens substrate remains in the marking recess as a residual material. After polishing and engraving, hard coating, photochromic coating, and antireflection coating are performed. In this coating process, a coating solution is applied to the lens substrate surface. However, in recent years, it has been found that the residual material of the stamp is eluted in the applied coating liquid, and this residual material becomes a foreign substance in the coating layer, resulting in a decrease in manufacturing yield. In particular, the photochromic coating liquid described later has a high property of eluting foreign matters, and contamination with foreign matters is a big problem. Residual substances are difficult to remove sufficiently by conventional cleaning.
On the other hand, in the present embodiment, a convex marking is formed and sealed in the convex marking so as not to diffuse the material in the laser irradiation region, thereby preventing foreign matter from being mixed into the coating liquid, and the spectacle lens The optical performance can be ensured satisfactorily and the production yield can be improved.

  (2) The above-mentioned convex laser engraving has low resistance to heat treatment (heat treatment at a temperature of about 90 ° C. or more) and disappears by high-temperature treatment in the processing process of hard coat coating or antireflection coating. There is a nature to end. Therefore, after marking the convex shape, the optical surface of the lens substrate including the marking is covered with a coating film to block a part of the atmospheric pressure, thereby maintaining the space inside the marking, Even if heat treatment is performed after the marking (heat treatment at a temperature of about 120 ° C. or less), the convex shape of the marking can be maintained, and the disappearance of the marking can be prevented.

  (3) If there is a defect in the marking formed on the optical surface of the lens blank 71 (progressive power lens 20) and the marking is defective, the lens blank 71 (progressive power lens 20) is heated to perform the above marking. , And a convex marking is re-formed on the optical surface of the lens blank 71 (progressive power lens 20), so that even when the marking is defective, a new marking can be easily re-formed. As a result, it is not necessary to discard the manufactured progressive-power lens 20, and the manufacturing yield of the progressive-power lens 20 can be improved.

  (4) Since engraving on the spectacle lens such as the progressive addition lens 20 is performed by duplicating the same portion at least twice, by using a laser having a low energy level, other than the engraving portion of the spectacle lens The thermal effect on the can be reduced. As a result, highly accurate and stable marking can be performed.

  (5) Since the engraving on the spectacle lens such as the progressive power lens 20 is performed discontinuously, and there is a predetermined time in which the engraving process is not performed in the process from the start to the end of the engraving, the predetermined time Since the heat generated by the laser marking can be dissipated during this period, the thermal effect on the spectacle lens can be further reduced.

(6) The same blank is used without blocking the lens blanks 71, the optical surface creation of the spectacle lens, the polishing process and the engraving process, and is the same in each manufacturing process of the optical surface creation process, polishing process and engraving process. The reference planes 72A, 72B and 73 of the yatoy 70 are used as the processing reference. For this reason, the accuracy of the marking is approximately the same as the processing control accuracy in the cutting device and the polishing device, and the control accuracy in the present embodiment is 1 micrometer.
On the other hand, in the conventional method in which the engraving is performed after the hard coat coating and the anti-reflection coating, the optical measurement point (the near power measurement point and the far power measurement point for the progressive power lens) and the lens geometric center are set. Since the reference position is specified by a lens meter or a lens outer diameter, the accuracy of the marking position is about 0.4 mm, and high-precision marking is impossible.
The engraving is a reference position for frame placement, and the accuracy of frame engraving can be improved by an accurate marking position. In particular, a double-sided aspherical progressive-power lens having no progressive surface on both sides, a progressive-power lens having an extremely short progressive zone, etc. have complicated optical designs. Furthermore, it is desired to improve the frame accuracy in combination with the improvement of the processing accuracy of the spectacle lens. Therefore, the demand for the improvement of the marking position accuracy has been particularly increased in recent years, and the improvement of the marking position accuracy directly affects the improvement of the frame placement accuracy and is effective.

  (7) Since the rectangular boxing area mark 8 for identifying the area lost by the balling process is engraved on the spectacle lens such as the progressive addition lens 20, the area other than the lost area (rectangular boxing) It is sufficient to inspect the area in the area mark 8 for quality assurance, and the above inspection of the lost area can be omitted, so that the inspection efficiency is increased and the production efficiency of the progressive addition lens 20 can be improved. it can. In addition, since it is not necessary to guarantee the quality of the area lost due to the balling process, it is not necessary to make it defective even if there is a defect in the lost area. As a result, the manufacturing yield of the progressive addition lens 20 is reduced. Can be improved.

  (8) When the target lens shape is the same as or slightly larger than the lens frame shape of the frame, as in the conventional case, the direction of the rotation is relative to the direction of the astigmatic axis or progressive zone length. It is assumed that unnecessary markings remain on the spectacle lens after the lashing process, resulting in a defect.

  On the other hand, in the present embodiment, the boxing area mark 8 is not a shape of the frame frame of the spectacle lens but a rectangle inscribed in the lens shape of the frame frame on the spectacle lens such as the progressive addition lens 20. . For this reason, even if the boxing area mark 8 having a rectangular shape with respect to the direction of the astigmatic axis or the progressive zone length has an error in the rotating direction, the error in the rotating direction can be easily made from the linear shape of the side of the boxing area mark 8. Can be recognized.

  Even if the rectangular boxing area mark 8 has an error in the rotation direction, the rectangular boxing area mark 8 has a margin for the target lens shape in the actual frame of the spectacle frame. The tolerance for error is wide, and after the spectacle lens is cast into a lens, a part of the rectangular boxing area mark 8 remains on the spectacle lens, and the spectacle lens can be prevented from being defective.

  (9) If the frame shape of the frame frame is engraved on the spectacle lens as in the past, a large amount of data is required to express the shape, and the amount of information increases dramatically because the shape varies from order to order. It was a problem. On the other hand, in this embodiment, since the boxing area mark 8 is a simple rectangle, the arrangement can be defined by at least four coordinate positions, and the amount of data transmitted and received can be reduced.

  (10) The shape of the spectacle frame varies depending on the order, and there are many types. When the eyeglass shape similar to the shape of the spectacle frame is engraved on the spectacle lens, the inspector visually inspects the frame frame. The burden of recognizing the mold shape was a big problem. On the other hand, in the present embodiment, a simple rectangular boxing area mark 8 (FIG. 1) is engraved on the spectacle lens in comparison with the target lens shape of the frame frame. It is possible to discriminate areas other than those and reduce the burden of visual inspection.

  (11) In general, it is difficult to accurately mark the lens optical surface at the convergence point of the laser beam oscillated from the fixed position. In this embodiment, since the marking position on the spectacle lens is accurately calculated from the surface shape of the spectacle lens such as the progressive-power lens 20 with the three-dimensional coordinate value and the marking position of the spectacle lens is controlled, the laser is always converged. Can be engraved with dots. Therefore, even if the spectacle lens surface to be engraved has a complicated shape such as a progressive or free-form surface, the engraving position can be accurately performed, and more precise engraving can be performed at all positions on the lens optical surface. For this reason, it is possible to carry out high-precision concave surface processing, ramming processing, and frame placement, and it is suitable for a progressive power lens that requires high frame placement accuracy, and is more suitable for a progressive power lens by double-side polishing.

As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to this.
For example, a CO ₂ laser is used as a laser emitted from the laser oscillation unit 45 of the laser marking device 41 for marking, but an excimer laser or a YAG laser can also be used. Further, the spectacle lens such as the progressive addition lens 20 for performing the engraving process may be a finished product having a desired optical surface on both sides, or a semi-finished product (semi-finished lens) after convex polishing. The boxing area mark 8 is not limited to a rectangular rectangle, but may be a square such as a square, a rhombus, or a parallelogram, or may be a polygon such as a pentagon or a hexagon.

  In the present embodiment, a photochromic film is coated on the optical surface of the lens blank 71 as a lens base material, and convex kakushiki imprints (9, 10, 11, 16, 17, 18) formed on the optical surface. , 19)), except for the photochromic film, the optical surface of the lens blank 71 is directly coated with a hard coating film, and the hard marking film is used to seal the kakushi mark inscription. Also good. In this case, when the antireflection coating is laminated on the hard coating coating, the sealing becomes more suitable.

FIG. 3 is an overall view showing a progressive-power lens engraved with various related information in an embodiment of a spectacle lens according to the present invention. 1 is an overall view showing a spectacle lens manufacturing system for carrying out an embodiment of a spectacle lens manufacturing method according to the present invention. It is a side view which shows the laser marking apparatus of FIG. FIG. 4 is a side sectional view taken along line IV-IV in FIG. 5, showing the mounting table position control unit in FIG. 3. It is sectional drawing which follows the VV line of FIG. It is a perspective view which shows a part of laser marking apparatus of FIG. It is a top view which shows the mounting base of FIG. It is a block diagram which mainly shows the laser oscillation part of FIG. It is a side view which shows the yatoe which blocked the concave surface of the spectacle lens. It is a perspective view which shows the blocking apparatus, a yatoe, etc. which block the concave surface of a spectacles lens. It is a graph which shows the height of the said stamp immediately after forming a Kakushi mark stamp. It is a graph which shows the height of the said inscription after performing coating processing (a photochromic film, a hard coating film, an antireflection film) to the optical surface in which the kaki mark mark was formed. It is a flowchart which shows one Embodiment of the manufacturing method of the spectacle lens which concerns on this invention.

Explanation of symbols

1, 2, 3 Block reference position mark 4, 5, 6 Re-blocking reference position mark 8 Boxing area mark 9, 10 Alignment reference mark (Kakshi mark)
11 Product identification information (kakushi mark)
12 Production number information 13 Individual production instruction information 16 Progressive zone length specific information (kakushi mark)
17 Material Refractive Index Specific Information (Kakshi Mark)
18 Additive power specific information (Kakshi mark)
19 Measurement Definition Method Specific Information (Kakashi Mark)
20 Progressive power lens (glasses lens)
30 Ordering terminal 35 Optical store (ordering side)
38 factories (manufacturing side)
41 Laser Engraving Device 44 Computer Terminal 45 Laser Oscillating Unit 46 Mounting Table Position Control Unit 57 Mounting Table 70 Yatoi (Lens Holding Member)
72A Vertical reference plane 72B Horizontal reference plane 73 Rotation reference plane

Claims (7)

A curved and surface optical surface that meets the optical specifications of the spectacle lens for ordering is formed on a lens substrate made of plastic material, and this optical surface is engraved on the optical surface with a laser before coating after polishing. A method of manufacturing a spectacle lens to be formed,
The above-mentioned engraving is formed in a convex shape,
In the case of this imperfect marking, the method for producing a spectacle lens, wherein the spectacle lens substrate is heat-treated to eliminate the marking and re-form a convex marking on the optical surface. An optical surface having a curved surface shape and a surface property satisfying the optical specifications of an eyeglass lens to be ordered is formed on a lens base material made of a plastic material, and the optical surface is engraved with a laser immediately after the optical surface is polished. A method of manufacturing a lens,
The above-mentioned engraving is formed in a convex shape,
After this marking formation, a coating layer capable of blocking atmospheric pressure is formed on the optical surface, and the marking is sealed with the coating layer,
In the case of the imprinting defect, the coat layer is removed, the spectacle lens substrate is heat-treated to extinguish the imprinting, and a convex imprint is re-formed on the optical surface. Production method.   2. The spectacle lens manufacturing method according to claim 1, wherein the marking is formed by a laser marking device that irradiates a laser having an infrared light wavelength.   3. The method for producing spectacle lenses according to claim 1, wherein the laser is a CO2 laser.   The method for manufacturing a spectacle lens according to any one of claims 1 to 4, wherein the heat treatment is performed at a temperature of 80C to 120C.   6. The method for producing a spectacle lens according to claim 1, wherein the heat treatment is performed for 50 minutes to 90 minutes. The stamp is a kakushi mark that is difficult to identify visually.
The manufacturing method of the spectacle lens in any one of 1 thru | or 6.

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