JP3686266B2 - End face processing method of spectacle lens - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides end face processing of spectacle lenses.About methodMirror surface applied to the end face after finishing with a bevelAbout processingIs.
[0002]
[Prior art]
The spectacle lens, which is normally called a three-piece type with no rim spectacles, is exposed without being covered with a rim or the like, and therefore is required to have a glossy polished surface. The technology that has been done by mechanical polishing by providing a motion mechanism that can follow the polishing wheel part, which has been done manually until now, to flatten the end face to make it a glossy polished surface. Has been proposed (for example, JP-A-64-87144). This is to polish the inclined surface such as the end face of the polyhedral cut lens, and the shape of the spectacle lens in the circumferential direction is complicated because it is cut into a polyhedron, but the end surface itself to be polished is a flat surface. Simple. Therefore, when the surface to be polished itself has a complicated shape such as a lens end surface having a bevel, the above technique cannot be applied. In the first place, since the lens end surface having a bevel is usually hidden behind the rim of the frame, there is no request for polishing the bevel surface itself, and the lens end surface having the bevel is not normally polished.
[0003]
[Problems to be solved by the invention]
By the way, there is a demand for a thin rim recently due to a reduction in the weight of a frame, an increase in fashionability, and the like. In that case, when the lens end surface is finished with a bevel finish, the bevel surface remains white, which indicates a problem of aesthetics. In order to polish the bevel surface that remains white and make it transparent, the bevel surface must be manually buffed, which incurs time and significant costs.
[0004]
The problem of the present invention is that the bevel surface is mechanically polished in two steps to solve the above-mentioned problems of the prior art, thereby speeding up the polishing process and making the finishing accuracy uniform. End face processing of eyeglass lenses that can produce affordable glassesmethodIt is to provide.
[0005]
[Means for Solving the Problems]
According to a first aspect of the present invention, a bevel polishing grindstone having a slope corresponding to a slope of a bevel mountain formed substantially on an end surface of a spectacle lens is used to polish one slope of the bevel mountain. This is a method for processing the end face of the spectacle lens in which the other slope of the remaining bevel mountain and polishing unevenness are polished.
[0006]
Having a slope substantially corresponding to the slope of the beveled mountain formed on the end face of the spectacle lens is not limited to the case where the two slopes of the beveled mountain are continuously located at the apex of the beveled mountain. It means that the case where two slopes are spatially separated is also included. In addition, the slope corresponding to the slope of Mt. Jagen is not limited to the slope of Mt. Yagen, and it also means that a flat skirt extending to Mt. Jagen is included. Therefore, one slope and the other slope of Mt. Jagen may include a skirt that continues to the mountain.
[0007]
At the stage where the bevel is finished on the end face of the spectacle lens, the slope of Mt. Yagen remains opaque and white. Therefore, the slope of Mt. Yagen is polished in a first process and a second process with a grindstone having a slope corresponding to Mt. In the first step, one slope of the grindstone is pressed against one slope of Mt. Yagen, and one slope of Mt. Jagen is polished. In the second step, the other slope of the bevel mountain remaining in the first step and the polishing unevenness are polished using the other slope of the grindstone. At this time, polishing is performed so that the peak position of the beveled mountain after polishing is restored to the peak position before polishing. When both slopes of Mt. Jagen are polished in this way, the remaining Mt. Jagen slope is mirror-finished and becomes transparent. Therefore, even if the bevel surface of the spectacle lens protrudes from the thin rim of the metal frame, or even if the lower half of the spectacle lens is exposed completely like a nyroll type frame, aesthetics can be maintained. In addition, since the bevel surface is mechanically mirror-finished using a grindstone, polishing is completed in a short time, and the cost can be reduced.
1st invention WHEREIN: The said grindstone is used for the end surface process of the spectacle lens in which one surface is a convex surface and an other surface is a concave surface, It is with respect to the perpendicular line drawn on the axis line of the said grindstone in the axial direction of the said grindstone surface. And a bevel groove that polishes the bevel on the inclined surface, and is formed continuously with the inclined surface of the bevel groove on the outer side of the bevel groove, It is preferable to have a flank which is called a second angle with respect to a vertical line drawn on the axis and has an inclination angle larger than the first angle.
The second corner is formed in the bevel shape. In the case of a frame with a large (deep) eyebrow, such as a combination frame (a plastic eyebrow attached to the eyebrow of a metal frame), the eyebrow hits the horizontal surface of the end surface other than the bevel, so that This is to form an escape.
In this way, a relief surface having a second angle larger than the first angle which is the groove slope angle is formed on the grindstone surface outside the bevel groove so that the eyebrow portion of the metal frame does not hit the peripheral surface of the bevel. Therefore, the eyebrows can be effectively attached to the metal frame.
1st invention WHEREIN: It is located in the concave surface side of the said spectacle lens with respect to the said bevel groove | channel. It is preferable that the width of the flank face in the grinding wheel axis direction is wider than the width of the flank face located on the convex side of the spectacle lens in the grinding wheel axis direction. If the width of the flank face located on the convex side of the spectacle lens is wider than the width of the flank face located on the concave side of the spectacle lens, it is possible to correspond to a thick intensity lens on the end face of the spectacle lens.
[0008]
According to a second aspect of the present invention, there is provided a method for processing an end surface of a spectacle lens having a bevel finished on an end surface of the spectacle lens, wherein a bevel polishing grindstone having a bevel groove having a shape corresponding to the bevel is used. The top position of the top of the bevel is shifted to the back side of the spectacle lens from the bottom position of the bevel groove (the deepest part of the groove) of the grinding wheel to polish the margin on the back side of the spectacle lens, and then the spectacle lens Returning to the original position, the top position of the bevel mountain on the end face of the spectacle lens is made to coincide with the bottom position of the bevel groove of the grindstone, and the machining margin left uncut from the bevel top surface side of the end face of the spectacle lens is polished. This is a method for processing an end face of a spectacle lens in which a bevel end face is mirror-finished.
[0009]
The allowance on the back surface side of the spectacle lens end surface to be polished first is not limited to the back surface side of the spectacle lens end surface, and may include the front surface side of the spectacle lens end surface.
[0010]
If the top position of the bevel peak on the end face of the spectacle lens is shifted to the back side of the spectacle lens relative to the bottom position of the bevel groove of the grindstone, the back side of the spectacle lens will be Since the contact with the inclined surface on the same side as the back surface side of the spectacle lens on the grindstone surface is made before the front surface side, the machining allowance on the back surface side of the spectacle lens is first polished. If the spectacle lens is returned to its original position and the peak position of the bevel crest of the spectacle lens is made to coincide with the bottom position of the bevel groove of the grindstone, this time the front side of the spectacle lens is ahead of the back side of the spectacle lens. The surface of the eyeglass lens is in contact with the inclined surface on the same side as the surface side of the spectacle lens, so the surface side of the spectacle lens and the remaining machining allowance are polished. The beveled surface remaining white by the polishing becomes transparent like the front and back surfaces of the spectacle lens.
[0011]
In the second invention, particularly when the spectacle lens is a hard and poor-cutting lens such as polycarbonate, when the surface side of the spectacle lens end surface and the remaining machining allowance are polished, It is preferable to increase the pressure contact force to the grinding wheel surface by slightly deviating the top position of the lens from the coincidence with the bottom position of the bevel groove of the grinding wheel.
[0012]
When the spectacle lens is a soft and good-cutting lens such as an acrylic resin diethylene glycol acrylic carbonate plastic lens (hereinafter referred to as a DEC lens), when polishing the surface side of the spectacle lens and the remaining machining allowance, There is no problem in polishing with the top position of the bevel crest of the spectacle lens aligned with the bottom position of the bevel groove of the grindstone. However, when the spectacle lens is a hard and poorly machinable lens such as a polycarbonate lens, there is a slight problem in polishing because the bevel surface on the surface side of the bevel crest of the spectacle lens is strong against the grindstone surface. . Therefore, by correcting the shift amount of the spectacle lens so that the top position of the bevel peak of the spectacle lens is slightly shifted to the surface side of the spectacle lens from the coincidence point with the bottom position of the bevel groove of the grindstone, The contact with the surface is strengthened. In this way, by correcting the shift amount of the spectacle lens according to the material of the spectacle lens and adjusting the force hitting the grinding wheel surface, even if the spectacle lens is a hard and poorly machinable lens, it is optimal Mirror finish is possible. In the second invention, the correction value for the shift amount is zero.
[0013]
In the first to second aspects of the invention, it is preferable that the spectacle lens is moved relative to the grindstone by moving the spectacle lens. In the relative movement of the spectacle lens with respect to the grindstone, the grindstone may be moved, but the apparatus configuration becomes simpler when the spectacle lens is moved as in the present invention. According to this, since the spectacle lens is moved, the existing technology can be used as it is, and the apparatus structure can be simplified.
[0017]
Furthermore, as a grindstone suitably used in the first and second inventions, for example,A rough grindstone for roughing the end face of the spectacle lens, a bevel finishing grindstone for forming a bevel on the end face of the spectacle lens, and a polish grindstone for mirror finishing the end face of the spectacle lens are integrally provided on the same axis, and the bevel The finishing grindstone and the polished grindstone have a bevel groove having a shape corresponding to the bevel on the surface thereof, a flank formed on both sides of the bevel groove, and a flank located on the back side of the spectacle lens among the flank A grindstone having a flat processed surface continuously provided on the surface. The bevel groove is a bevel finish groove in the case of a bevel finish grindstone, and is a bevel polish groove in the case of a polish grindstone. In the case of a bevel finish grindstone, the flat surface is a flat surface and in the case of a polish grindstone, it is a flat surface.
[0018]
When processing the end face of the spectacle lens, the end face of the spectacle lens is roughened by moving the spectacle lens sequentially with the rough whetstone, bevel finish whetstone, and polish whetstone with respect to the axial direction of the whetstone. The bevel is formed on the rough surface, and the inclined surface of the formed bevel is mirror-finished, and these processes are performed in series.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
[0022]
FIG. 3 is a perspective view of a main part of an internal structure called a spectacle lens end surface processing apparatus, a so-called ball grinder, for carrying out the spectacle lens end surface processing method according to the present invention. In FIG. 3, the grindstone 1 which is a rotary cutting diamond wheel is transmitted with power by a power transmission mechanism of a pulley 3 and a belt 4 by a motor for a grindstone (not shown). The grindstone 1 that rotates via the spindle 5 is pressed against the spectacle lens 6 to cut the spectacle lens 6. The spectacle lens 6 is held at a predetermined position by a lens pressing shaft 7 and a lens support shaft 8. The rotation of the chucking motor 9 is transmitted to the lens pressing shaft 7 via the belt 10 and the pulley 11, and the lens pressing shaft 7 can move in the axial direction when the feed screw 12 is rotated. Thereby, the spectacle lens 6 can be attached and detached.
[0023]
The eyeglass lens 6 is rotated by synchronous rotation of the lens pressing shaft 7 and the lens support shaft 8. The lens presser shaft 7 and the lens support shaft 8 are driven by a lens rotation motor and gears 14 and 15, and an interlocking shaft 16 is rotated. Power is transmitted between a pulley 17 provided at both ends of the interlocking shaft 16 and a belt 18 wound around the pulley 17. Each mechanism is rotated via a pulley 19. A homa for providing a lens pattern (not shown, but the homa is attached to a place where the bearing 20 is provided) and an unprocessed round spectacle lens 6 are attached to both ends of the lens support shaft 8. The lens support shaft 8 is interlocked with the encoder 23 via gears 21 and 22, whereby the rotation angle of the lens support shaft 8 is measured.
[0024]
Reference numeral 24 denotes a carriage. The carriage 24 accommodates the motors 9 and 13 and their associated power transmission mechanisms, the lens pressing shaft 7 and the lens support shaft 8. The spectacle lens 6 is disposed in the center of a recess formed in front of the carriage 24. The eyeglass lens 6 descends when the carriage 24 swings around the slide shaft 25 as indicated by the arrow L1, and is pressed against the grindstone 1 by the weight of the carriage 24 and cut. The slide shaft 25 is supported so as to be rotatable and slidable in the axial direction by slide bearings 27 held by two bearing pedestals 26, respectively.
[0025]
A bearing 32 is fitted at the right end of the slide shaft 25 in the figure so as to be rotatable relative to the slide shaft 25, and an arm 33 is fixed to the bearing 32 near the rear end portion. A belt 34 is stretched between the pulley 35 and the pulley 37 of the electromagnetic clutch 36 in parallel with the slide shaft 25. The rear end of the arm 33 is fixed to the belt 34 by a fixing plate 38. The electromagnetic clutch 36 is interlocked with the X-axis motor 41 via gears 39 and 40. By operating the X-axis motor 41 based on this structure, the slide shaft 25 and the carriage 24 move in the axial direction of the slide shaft 25, that is, in the X-axis direction (horizontal direction) as indicated by an arrow L2.
[0026]
A holding base 42 is fixed to the front end of the arm 33, and a profile plate 43 having a surface with the same radius of curvature as that of the grindstone 1 is fixed to the support table 42 (however, the profile plate is a patternless edger. In the case of a simple configuration, the same curvature is not necessary). Since the arm 33 moves as described above, a roller 45 is provided between the holding platform 42 and the lifting platform 44 of the supporting mechanism provided below the support platform 42 to support the holding platform 42. The holding table 42 slides through the roller 45.
[0027]
In FIG. 3, reference numeral 49 denotes a Y-axis motor in the Y-axis direction (vertical direction) as indicated by an arrow L3. By operating the Y-axis motor 49, the elevator 44 can be moved up and down in the vertical direction. . When the elevator 44 is raised and lowered, the carriage 24 can be moved around the slide shaft 25 through the arm 33 and the slide shaft 25 as indicated by the arrow L1.
[0028]
In the above, the carriage 24 is moved in the horizontal direction by the X-axis motor 41 and moved in the vertical direction by the Y-axis motor 49. By moving the carriage 24 in the horizontal direction or the vertical direction in this manner, the position of the spectacle lens 6 to be processed can be arbitrarily changed in the horizontal direction, and the spectacle lens 6 can be pressed against and separated from the grindstone 1. .
[0029]
The grindstone 1 has a cylindrical shape, and its peripheral surface is formed as a lens cutting surface. A part of the peripheral surface for cutting of the grindstone 1 is a cutting surface for roughing the lens, and a V-shaped bevel groove 1a is formed following the cutting surface for roughing the lens. The bevel groove 1a is a portion used when forming a bevel on the lens end face after roughing. Further, a V-shaped bevel groove 1b used for mirror polishing of the lens end surface after forming the bevel is formed in another portion.
[0030]
In addition, since the above-mentioned ball grinder can automatically trace the shape of the frame as will be described later, it can be used independently for the Y-axis even if it is not processed using the plate 43 (pattern) that is the same as the Houma. The motor 49 can be driven. In other words, the ball grinder can be used as both a patternless processing machine and a pattern processing machine.
[0031]
FIG. 4 shows a lens periphery measuring device 53, which measures the lens periphery thickness and the like of the periphery of the spectacle lens 6, and is a perspective view showing a state in which the open / close door 64 of the measuring device storage chamber 63 is opened. is there. In FIG. 3, the lens periphery measuring device 53 is indicated by an imaginary line (two-dot chain line) at a position on the front side of the front recess of the carriage 24 and above the grindstone 1. The first and second measuring elements 65 and 66 that are in contact with the front and back surfaces of the spectacle lens having a convex surface on one surface and a concave surface on the opposite surface are respectively rotated at the upper end surface of the shaft 62 that moves up and down in the storage chamber 63. It is supported by movable arms 72 and 73. In the figure, each arm is in the retracted position and the measuring elements 65 and 66 are stored in the measuring instrument storage chamber 63. In this ball grinder, since the measuring instrument is arranged outside the carriage 24, the lens periphery measuring device 53 can avoid the influence of vibration during lens grinding.
[0032]
FIG. 5 is a perspective view showing an internal mechanism of the measuring instrument storage chamber 63. An interlocking shaft 77 is rotatably spanned between the left and right sides of the base 61. The left side of the interlocking shaft 77 is omitted, but a belt 80 is suspended around two pulleys 79 on the left and right. The box 78 suspended by two constant load springs 81 (the left side is not shown) on the front surface of the base 61 is configured to move up and down.
[0033]
A shaft 71 supporting the measuring elements 65 and 66 at the upper end surface is fixed to the upper plate of the box 78. Here, the rotational positions of the left and right arms 72 and 73 of the measuring elements 65 and 66 are controlled by the middle shafts that rotate independently within the shaft 71. Further, inside the vertical movement box 78, a motor (not shown) for rotating the arms 72, 73 between the measurement position and the retracted position, and the amount of movement of the arms 72, 73 in the lens axis direction are detected. An encoder (not shown), a solenoid (not shown) having an operating piece (an amateur) that opens the arms 72 and 73 to a predetermined angle at a measurement position, and the like are arranged. In addition, rotatable feelers 74 and 75 are provided at the distal ends of the arms 72 and 66 of the measuring elements 65 and 66 so as to come into contact with the spectacle lens 6.
[0034]
The block diagram of the grindstone 1 mentioned above is shown in FIG. The grindstone 1 of the ball grinder includes a roughing grindstone 81 for roughing formed in a cylindrical shape, and a bevel finish grindstone for beveling for forming a bevel on the lens end surface after roughing or for flattening. 82 and a polished grindstone 83 that mirror-finishes the bevel surface after beveling and the lens end surface after flattening are integrally provided on the same axis, and are fixed to the spindle 5 (see FIG. 3) by a fixing screw. It is fixed.
[0035]
V-shaped bevel finish grooves 82 a and bevel polish grooves 83 a are formed on the circumferential surfaces of the bevel finish grindstone 82 and the polish grindstone 83. Further, the circumferential surfaces of the bevel finishing grooves 82a of the bevel finishing grindstone 82 and the polishing grindstone 83, and the circumferential surfaces of the grindstones 82 and 83 positioned on the left and right of the bevel polishing groove 83a are narrow on the left side, which is the convex surface side of the spectacle lens. The right side becomes wider. If the width of the flank face located on the concave side of the spectacle lens is wider than the width of the flank face located on the convex side of the spectacle lens, it is possible to correspond to a thick intensity lens on the end face of the spectacle lens. The wide circumferential surface on the right side constitutes a flattened finish surface 82c and a flattened polish surface 83c. The bevel finish grindstone 82 is flattened for finishing, and the polished grindstone 83 is flat. Each can be mirror-finished after scraping.
[0036]
The left and right circumferential surfaces of the bevel finish groove 82a and the bevel polish groove 83a are not horizontal surfaces but are inclined surfaces whose diameters increase slightly toward the left and right (axial direction). In the case of a frame with a large (deep) eyebrow, such as a combination frame (a plastic eyebrow attached to the eyebrow of a metal frame), the eyebrow hits the horizontal surface of the end surface other than the bevel, so that This is to form an escape. Further, the right side flat finished surface 82c and the flat polished surface 83c which are widened have a small inclination angle (from the position indicated by the dotted line) and approach the horizontal plane (this point will be described later).
[0037]
Roughing stone 81 (mesh: about # 50 to 150), bevel finish whetstone 82 (mesh: about # 400 to 600), and polish whetstone 83 (mesh: about # 1000 to about 4000) are roughed, beveled, flat, and mirror polished. Instead of substantially changing the rotation of the grindstone in each of these steps, the grindstone diameter is constant and is controlled by changing the particle size of the grindstone. In the illustrated example, only one type of the bevel finishing grindstone 82 and the polished grindstone 83 is shown. However, since there are a plurality of types of bevels, there are a plurality of types of these grindstones.
[0038]
FIG. 7 shows a detailed view of the main part of the V-shaped bevel groove 1a of the grindstone 1 common to the bevel finishing grindstone 82 and the polished grindstone 83 and the peripheral end surface thereof. The bevel groove 1a and the peripheral end surface thereof are constituted by two kinds of angles called first angle θ and second angle φ. The first angle θ is an angle θ formed between two opposing inclined surfaces 1b and 1c of the V-shaped bevel groove 1a corresponding to the bevel of the spectacle lens and a vertical line L drawn on the axis of the grindstone 1.₁, Θ₂Say. The second angle φ is connected to the V-shaped bevel groove 1a, and the angle φ formed between the right and left inclined surfaces 1d and 1e and the vertical line L located outside the bevel groove 1a.₁, Φ₂Say. The second angle φ is formed for the relief of the eyebrows as described above. In FIG. 6, flank faces 82b and 83b formed at the second corner indicate boundaries with imaginary lines.
[0039]
As shown in FIG. 8, in order to cut the end face of the spectacle lens 6 using the grindstone 1 having the rough grindstone 81, the bevel finish grindstone 82, and the polish grindstone 83 continuously on the same axis, The eyeglass lens 6 sandwiched between the lens support shaft 8 is pressed against the grindstone 1 and the right arrow X in the X-axis direction_RGradually shift from left to right as shown in. As a result, rough cutting, bevel finishing, and polishing are sequentially performed. In the case of flattening without forming a bevel, after roughing, the flattened finish surface 82c and the flattened polished surface 83c are sequentially pressed against each other while avoiding the bevel finish groove 82a. In addition, since the spectacle lens 6 should just be press-contacted relatively with the grindstone 1, you may make it the grindstone 1 press-contact with the spectacle lens 6. FIG. In each of the automatic bevel, forced bevel, and flat slide modes, which will be described later, the measurement of the all-around edge position of the spectacle lens 6 is performed by using the feelers 74 and 75 of the lens periphery measuring device 53 (see FIG. 5) as shown in FIG. 6 is performed by contacting the
[0040]
FIG. 9 shows an electrical apparatus configuration for executing the method for processing the end face of the spectacle lens 6. In FIG. 9, reference numeral 100 denotes an arithmetic control circuit unit that executes various types of arithmetic operations for end face processing and performs control with data obtained by the arithmetic operations, and is configured by a computer. A lens edge position measurement unit 121 and a shape data input unit 120 are provided as input units. Further, an operation panel 110 is provided, and if the operation unit 112 of the operation panel 110 is operated, roughing, trial cutting, finishing, polishing, etc. are executed according to the operation content. In addition, operation information such as a set value is input to the arithmetic control circuit unit 100 from the input unit 111 of the operation panel 110.
[0041]
In the beveling process and the bevel mirroring process (hereinafter simply referred to as beveling process), as described above, various data are required for the spectacle lens 6 and the end face part thereof, but the shape data is input from the shape data input unit 120 to the arithmetic control circuit unit 100. The shape data memory 104 is temporarily stored. The accumulated shape data is read out to the beveling data calculation unit 103 and calculated together with the lens edge position data input from the lens edge position measuring unit 121, and the beveling data as the calculation result is stored in the beveling data memory. 102. Here, the beveling data memory 102 is a memory for storing control data for beveling given to the X-axis motor 41. The control data varies depending on the type of bevel. When the grindstone has a plurality of bevels (large bevel, small bevel), the bevel position can be selectively driven by movement in the X-axis direction based on the control data. For example, the type of bevel differs between a plastic frame and a metal frame, a large bevel is formed on a plastic grindstone, and a small bevel is formed on a metal grindstone.
[0042]
The arithmetic control circuit unit 100 is provided with a machining correction value memory 101 for supplying control data to the Y-axis motor 49. The processing correction value memory 101 is a memory that stores correction data required according to the type of spectacle lens and the material of the frame. The correction data differs depending on whether the spectacle lens type is glass, plastic lens, or whether or not the cutting pressure needs to be adjusted. Further, in the case of a plastic lens, the cutting performance varies depending on the type of plastic, and thus different correction data is required. Further, since the material of the frame is different from metal, cell, edgeless, etc., how to bevel is different, and the diameter of the bevel mirror finish is different accordingly, it is necessary to prepare correction data according to them.
[0043]
Control data from the arithmetic control circuit unit 100 is given to the grinding wheel rotation motor 123 via the grinding wheel rotation motor control unit 122 and to the lens rotation motor 13 via the lens rotation drive control unit 124. Further, the lens edge measurement is performed via the Y-axis drive control unit 125, the Y-axis motor 49, the X-axis drive control unit 126, the X-axis motor 41, and the lens edge measurement unit drive control unit 127. The motors 128 are respectively provided.
[0044]
Next, using the flowchart of FIG. 10, a beveling procedure starting from shape data input and including a bevel mirror finish will be described.
[0045]
Trace the spectacle frame selected by the customer at the spectacle store. After starting the trace, the measured shape data is input from the shape data input unit 120 to the arithmetic control circuit unit 100 (step 201). Specifically, the frame trace of the spectacle frame, the rimless type pattern trace without the spectacle frame, and the edge lens trace of the spectacle lens are performed, and the shape data obtained by these is transmitted to the shape data via the shape data input unit 120. Input to the memory 104.
[0046]
Subsequently, the eyeglass lens layout data is input (step 202). To input layout data, the following processing conditions must be set. As processing conditions, for example, selection of cutting type (glass, plastic, polycarbonate, acrylic), selection of frame material (cell, metal), frame PD (pupil distance (FPD, DBL)) input, PD (both eyes, one eye) ) Input, horizontal direction eccentricity X input, vertical direction eccentricity Y (Y, EPH, BXH) input, astigmatism axis Ax input, finish size input, and the like.
[0047]
Next, a processing mode is set (step 203). As described above, the machining mode includes three types of cutting processes such as automatic beveling, forced beveling, and flattening, and the processing mode to be selected is set. In addition, mirror finishing can be set for each. When automatic is selected, the computer automatically determines the position where the bevel is raised on the end face of the spectacle lens. The position where the bevel is raised can be changed by a predetermined procedure. If forced is selected, a bevel can be set at an arbitrary position. When a flat rail is selected, flat rail processing can be performed without causing a bevel.
[0048]
Machining mode settingConstantAfter step 203), the process waits for the processing start button to be pressed from the operation panel 110 (step 204). When processing is started, the lens edge measuring motor 128 is driven to trace the edge (periphery) of the spectacle lens ( Step 205). This edge tracing is performed by the lens periphery measuring device 53 shown in FIGS. Here, the entire edge position of the lens is measured in all processing modes (automatic, forced, and flat). The measurement value is input from the lens edge position measurement unit 121 to the beveling data calculation unit 103 of the calculation control circuit unit 100. The bevel processing data calculation unit 103 to which the lens edge position measurement value and the shape data are added calculates bevel processing data by a known method (step 206).
[0049]
Next, end face processing of the spectacle lens is performed in order to fit the spectacle lens 6 into the rim of the spectacle frame based on the bevel processing data obtained by the calculation. For this purpose, the end face of the spectacle lens 6 is first rough-processed using the rough grindstone 81 (step 207). That is, the eyeglass lens 6 is disposed at a predetermined position shown in FIG. 3 by operating the chucking motor 9 and the lens support shaft 8 and the lens pressing shaft 7. Based on the trace data, the X-axis motor 41 and the Y-axis motor 49 are operated to bring the spectacle lens 6 into pressure contact with the rough grindstone 81 of the grindstone 1 by applying a required load. The grindstone rotating motor 123 is driven by the grindstone rotating motor control unit 122 to rotate the grindstone 1 and the lens rotating motor 13 is driven to rotate the spectacle lens 6. Thereby, roughing of the end surface portion of the spectacle lens 6 based on the trace data is performed.
[0050]
Next, the bevel finish surface processing is performed (step 208). Finishing is performed while giving information on the top position of the bevel mountain and the bevel curve. In the bevel finishing process, in each part of the lens end face, the position of the apex of the bevel peak on the lens end face is the ratio of the distance between the front edge and the back edge and the apex of the bevel peak in the end face width (lens thickness) direction. The bevel finishing is performed in a state in which is kept at the constant value initially selected and set. In order to raise a bevel at the end surface portion of the spectacle lens, it is necessary to determine a bevel curve. However, a method for obtaining the bevel curve is not described in detail here.
[0051]
In the bevel finish surface machining, it is necessary to control and drive the X-axis motor 41 based on the bevel machining data calculated in step 206 so that the top position of the bevel mountain after machining and the deepest part of the bevel groove of the grindstone 1 coincide. is there. Therefore, the Y-axis motor 49 is driven to release the spectacle lens 6 from the grindstone 1 by a predetermined amount in order to once separate the spectacle lens 6 that has been subjected to the rough machining in step 207 from the grindstone 1.
[0052]
Next, the X-axis motor 41 is rotated by a certain amount to move the spectacle lens 6 to the position of the beveling grindstone. Thereafter, the Y-axis motor 49 is driven to lower the carriage 24 and press the eyeglass lens 6 against the grindstone 1. The grindstone rotating motor is driven to rotate the grindstone 1, and the lens motor 13 is driven to rotate the spectacle lens 6. The X-axis motor 41 is controlled and driven based on the beveling data calculated in step 206. As a result, the beveling is performed.
[0053]
After finishing the bevel finish surface processing, the bevel finish lens is mirror-polished in order to make the white and opaque bevel surface transparent. At this time, if both slopes of the bevel surface are simultaneously machined with the polishing grindstone 83 having the bevel groove corresponding to the bevel, a difference is produced in the mirror finish of the both bevel faces. This is because the apex position of the bevel peak is curved along the circumferential direction on the edge thickness, and the convex side of the lens strongly hits the mirror grindstone during polishing. Therefore, in the present embodiment, the concave side bevel surface and the convex side bevel surface are converted into two steps by controlling the finish lens in the X-axis direction so that there is no difference in the finish of the both slopes and the degree of mirror surface. The bevel mirror surface processing (bevel polishing) is performed separately (steps 209 and 210).
[0054]
However, when the bevel polish polishing is performed in two steps in this way, a lens with a soft finish such as a DEL lens and a good cutting ability, and a lens that is hard and has a poor cutting ability such as polycarbonate, are controlled by the X axis control. It is necessary to make a slight difference.
(A) A bevel polished plastic or acrylic finish lens (Figure 1)
As correction data for a plastic or acrylic lens, “0.0 mm” is stored in advance in the processing correction value memory 101 of the arithmetic control circuit unit 100. The end surface allowance 175 of the finishing lens 76 is 0.1 mm. First, bevel mirror processing is performed on the concave surface side of the finishing lens 76 (step 209).
[0055]
▲ 1 ▼ Start cutting
The concave surface of the finishing lens 76 is driven so that the bevel apex position 176 of the finishing lens 76 is shifted 0.3 mm to the right of the bevel groove center position (bottom position of the bevel groove) 183 of the polishing grindstone 83 by driving the X-axis motor 41. The finishing lens 76 is moved to the right side (FIG. 1A). Therefore, the bevel apex position 176 does not coincide with the bevel groove center position at the start of cutting.
[0056]
(2) First cutting
The Y-axis motor 49 is driven to lower the carriage 24 in the direction of the white arrow, and in the first cutting, the finishing lens 76 is lowered to the position of the temporary size 174. Of the allowance 175, the concave surface side of the finishing lens 76 The cutting allowance part (hatched cutting part) 175a is cut (FIG. 1 (b)). At this time, a part of the machining allowance on the convex surface side of the finishing lens 76 is also cut. Next, convex side bevel mirror processing is performed (step 210).
[0057]
(3) Second cutting
The X-axis motor 41 is driven, and the bevel cutting position is returned by 0.3 mm as indicated by the left arrow direction, so that the bevel apex position 176 and the bevel groove center position coincide with each other. The Y-axis motor 49 is driven to lower the finish lens 76 in the direction of the white arrow down to the finish size position 173, and the removal portion 175b on the convex surface side of the finish lens 76 and the remaining polishing unevenness are cut (FIG. 1 ( c)).
[0058]
(4) End of cutting
The Y-axis motor 49 is driven to raise the carriage 24 as indicated by the white up arrow, and the lens 86 is separated from the grindstone 1. As a result, a specular lens 86 having a beveled surface is processed (FIG. 1D).
(B) Polygon finish lens bevel polish (Figure 2)
“−0.1 mm” is stored in advance in the processing correction value memory 101 of the arithmetic control circuit unit 100 as correction data for the polycarbonate lens.
[0059]
▲ 1 ▼ Start cutting
This is the same as (A) {circle over (1)} of the bevel polish cutting method described above.
[0060]
(2) First cutting
This is the same as (A) (2) in the aforementioned bevel polish cutting method.
[0061]
(3) Second cutting
In order to drive the X-axis motor 41 to shift the bevel apex position 176 of the finish lens 76 to the left by 0.1 mm from the bevel groove center position 183 of the polish grindstone 83, the finish lens 76 is white on the convex side of the finish lens 76. By moving in the direction of the left arrow, the pressing force against the polishing grindstone 83 is increased. Then, the Y-axis motor 49 is driven to lower the finishing lens 76 to the finishing size position 173 in the direction of the white down arrow. Thereby, the machining allowance portion 175b on the convex surface side of the finishing lens 76 and the remaining polishing unevenness are effectively cut (FIG. 2).
[0062]
(4) End of cutting
The mirror finish is the same as (4) (A).
[0063]
As described above, in the bevel mirror processing of the embodiment, as described in the above (A) and (B), the two bevel surfaces are not polished at the same time, but the concave side and the convex side are twice. In this case, the finishing lens is controlled in the X-axis direction so as not to leave the machining allowance or damage the bevel position, so even if the locus of the bevel apex is curved, Machine polishing can be performed with high precision without leaving uncut parts. As a result, the beveled surface that remains white can be made transparent.
[0064]
In the embodiment described above, when the mirror finish is performed, the concave side is polished first, and the convex side is polished later. In the case of the illustrated finish lens (ordinary meniscus lens), the top of the bevel is deviated to the convex side in the edge thickness direction, and there is a flat part protruding from the frame rim on the concave side of the bevel surface. This is because if the flat portion side is not polished first, a polishing residue is generated at the edge portion on the convex side of the bevel surface.
[0065]
By the way, as described above, a cylindrical grindstone called a diamond wheel has a bevel finish grindstone and a polished grindstone, and a bevel groove for forming a bevel or a bevel mirror surface on the end surface of the spectacle lens and an end surface of the spectacle lens are flattened. And a flat finish surface. More specifically, as shown in FIG. 11, a groove slope 301 for beveling having a predetermined angle called a first angle with respect to the grinding wheel axis direction on the circumferential surface, and an axis line continuous with the groove slope 301 A flank 302 for the eyebrows of the frame having a predetermined angle called a second angle smaller than the first angle with respect to the direction, and a flattening for flattening that is continuous with the flank 302 and parallel to the axial direction And a finishing surface 303. The inclination is not continuous at a boundary K (a dashed line which is an imaginary line) between the flank 302 and the flat finish surface 303.
[0066]
Therefore, when the spectacle lens 6 is shifted to the left in the X-axis direction beyond the boundary K during flattening processing, the end surface of the spectacle lens 6 straddles the boundary K, and the boundary K streaks on the end surface 6a of the spectacle lens 6. Will be attached. If the end face of the spectacle lens 6 is streaked, the finishing accuracy is lowered and uneven, and this is not preferable in terms of fashion.
[0067]
Therefore, in order to eliminate this inconvenience, a sufficient margin is provided for the length in the axial direction of the flat-slip finish surface 303 and the boundary K is exceeded even when the spectacle lens 6 is shifted to the left in the X-axis direction during the flat-sliding process. I was trying not to. However, as a result, there is a problem that the grindstone 1 is enlarged in the axial direction.
[0068]
The embodiment described below solves this problem. In the case of flat surface processing or mirror surface processing performed after flat surface processing (hereinafter simply referred to as flat surface processing), in order to prevent the end surface of the spectacle lens from being streaked, a conventional flat surface finish surface that has been horizontal is used. In order to make it common with the second corner constituting the flank, a certain degree of angle is given to the axial direction so that the boundary line is not attached. In addition, the word of the 1st complementary angle-the 2nd complementary angle corresponding to the 1st angle-the 2nd angle, and also the 3rd complementary angle is defined here.
[0069]
As shown in FIG. 6 described above, the grindstone 1 includes a rough grindstone 81, a bevel finish grindstone 82, and a polished grindstone 83 with a common axis. Of these, the bevel finishing grindstone 82 and the polished grindstone 83 are commonly used, as shown in FIG. 12, in the axial direction S on the circumferential surface of the grindstone, and a groove for beveling having a first complementary angle α with respect to the axial direction S. An inclined surface 301, a flank 302 for the eyebrows of a frame that is continuous with the groove inclined surface 301 and has a second complementary angle β smaller than the first complementary angle α with respect to the axial direction S, and the flank 302 is continuous. And a flat finish surface 303 for flat processing. Then, the flattened finish surface 303 is given a third complementary angle γ smaller than the second complementary angle β of the flank 302 with respect to the axial direction S of the grindstone 300. As a rule, the flattening process is performed by cutting on a horizontal plane. However, if the inclination angle is gentle, there is no problem even if the cutting is performed on the inclined surface. Therefore, a flat-finished surface 303 inclined at a third complementary angle γ smaller than the second complementary angle β is formed. The boundary between the flank 302 and the flat finish surface 303 is a boundary K.
[0070]
Specifically, if the second complementary angle β is 4 ° with respect to the axial direction S, the third complementary angle γ of the flat finish surface 303 is also 2 ° with respect to the axial direction S, and the second complementary angle β The angle difference from the third complementary angle γ is very small. With such a small angle difference, even if the end surface of the spectacle lens protrudes from the boundary K, the boundary line is not substantially attached to the end surface of the spectacle lens.
[0071]
By the way, the angle difference between the flank face and the flat finish surface is made small and the inclination angle at the boundary between the flank face and the flat finish surface is made continuous as much as possible. Even if the streak is not attached, the generation of the streak cannot be completely avoided as long as there is an angle at the boundary. However, with regard to this point, even during flattening, if the position of the spectacle lens in the X-axis direction is controlled so that the apex of the end surface on the convex surface side of the spectacle lens does not exceed the boundary, the flattened finish surface will be Even if an inclination angle is not provided, a horizontal plane may be used as usual.
[0072]
In addition, as described above, even if the end surface of the spectacle lens is flat-finished with a flat-finished surface that is shared with the 2nd complementary angle that constitutes the flank, a margin is provided for the width of the flat-finished surface. Then, since there is no change, the width of the grindstone 1 is increased by an amount that provides a margin, and as a result, the size of the ball grinder is increased. However, also in this respect, if the spectacle lens does not cross the boundary and is always controlled in the X axis so as to be in contact with the boundary, it is not necessary to provide a margin for the width of the grindstone.
[0073]
Therefore, an embodiment in consideration of the above points will be described using a polishing grindstone 320 in FIG. In the figure, reference numeral 311 denotes a groove slope of the bevel polished groove 310, and 312 denotes a flank, and the flattened polished surface 313 is left with the above-mentioned third complementary angle γ.
[0074]
The X-axis motor 41 is driven to move the carriage 24 in the X-axis direction. As shown in FIG. 13, the vertex A of the convex-side end surface 6a of the spectacle lens 6 is the K point at the boundary of the grindstone 320 indicated by an imaginary line. Fit. Next, the Y-axis motor 49 is driven to lower the carriage 24 and press the eyeglass lens 6 against the grindstone 320 (FIG. 13A). In this state, flattening is performed up to the position of the finished surface 6b indicated by the imaginary line.
[0075]
In the process of flattening, if processing is performed with the position of the spectacle lens 6 in the X-axis direction fixed, the boundary K of the grindstone 320 will move on the imaginary line. The boundary K enters the inside of the end surface 6a of the spectacle lens 6 as indicated by the intersection C between the finish surface 6b and the spectacle lens surface. In order to avoid this, movement control of the right side of the spectacle lens 6 in the X-axis direction by the X-axis motor 41 is always performed. As shown in FIG. 13B, the vertex A of the convex side end surface of the spectacle lens 6 where the convex surface and the end surface of the spectacle lens 6 intersect is always pressed against the boundary K of the flat polishing surface 313 of the bevel polishing grindstone 320. In this way, the control is performed so that the point B where the finishing surface 6b intersects the convex surface is located at the boundary position at the end of processing.
[0076]
When the position of the spectacle lens 6 in the X-axis direction is controlled so that the vertex A of the convex side end surface of the spectacle lens 6 is always in pressure contact with the boundary K of the flat polishing surface 313 of the grindstone 320 in this way, the spectacle lens 6 is bounded. Since K is not crossed, the end face of the spectacle lens 6 is not streaked due to the boundary K. Further, since the vertex A of the end face on the convex surface side is always controlled so as to coincide with the boundary K, the extra length of the flat surface 313 is not necessary. As a result, the width of the grindstone 320 can be reduced.
[0077]
The above-described shortening of the width of the polished grindstone can be similarly applied to the case of a bevel finish grindstone.
[0078]
Specifically, the width of the flat processed surface (flat-finished surface, flat-polished polished surface), which was 24 mm in the past, could be shortened, including the bevel, to 20 mm for the finishing whetstone and 20 mm for the polishing whetstone. .
[0079]
According to the above embodiment, even if there is no allowance in the width of the grindstone, no boundary streak is attached to the end face of the spectacle lens, and the finishing accuracy of the end face processing of the spectacle lens becomes uniform. Further, since the width of the grindstone can be reduced, the polished grindstone 83 can be additionally provided without greatly increasing the width of the grindstone.
[0080]
In the above-described embodiment, the X axis is controlled so that the vertex of the convex side end face always coincides with the boundary K. However, the control is free as long as it is within the flat polishing surface 313, but only the boundary K is not exceeded. Even in such a manner of control, it is possible to prevent the boundary K from being added. Further, the various motors used in the embodiments are preferably stepping motors. Further, in the embodiment, the minus lens has been described, and the present invention can be similarly applied to a plus lens.
[0081]
【The invention's effect】
According to the first aspect of the present invention, the bevel mountain is polished in two steps so that there is no uncut portion, so that mechanical polishing using a grindstone can be easily realized. In addition, mirror processing using a grindstone is possible, so processing speed can be increased compared to manual buffing,FinishUniformity of accuracy can be achieved. Furthermore, since the bevel surface of the spectacle lens can also maintain aesthetics, fashionable spectacles can be realized.
[0082]
According to the second invention, the bevel surface on the back side of the spectacle lens and the bevel surface on the front side of the spectacle lens are cut in two steps at the top of the bevel peak of the spectacle lens. The bevel can be mirror-polished while maintaining the finished shape and the apex position of the bevel.
[Brief description of the drawings]
FIG. 1 is a process diagram of a bevel polish cutting method according to an embodiment.
FIG. 2 is a process diagram of a main part of a bevel polish cutting method according to another embodiment.
FIG. 3 is a perspective view showing a main structure of an eyeglass lens end surface processing apparatus according to an embodiment;
FIG. 4 is a perspective view of a lens periphery measuring apparatus according to an embodiment.
FIG. 5 is a perspective view showing an internal structure of the lens periphery measuring apparatus according to the embodiment.
FIG. 6 is a configuration diagram of a grindstone according to an embodiment.
FIG. 7 is a main part configuration diagram of a bevel grindstone according to an embodiment.
FIG. 8 is an explanatory diagram of end face processing and lens measurement of a spectacle lens according to an embodiment.
FIG. 9 is a configuration diagram of an electrical control system for carrying out the eyeglass lens end face processing method according to the embodiment;
FIG. 10 is a flowchart illustrating an eyeglass lens end surface processing method according to the embodiment.
FIG. 11 is an explanatory view showing a conventional flattening method.
FIG. 12 is an explanatory diagram of a main part of a grindstone used in a flattening process according to an embodiment.
FIG. 13 is a process diagram illustrating a flattening method according to an embodiment.
[Explanation of symbols]
76 Finishing lens
83 Polished grinding wheel
83a Jage polish groove
86 mirror lens
173 Finish size
174 provisional size
176 The bevel apex position
183 Slit groove center position
175 Toray

Claims (5)

A bevel polishing grindstone having a slope corresponding to the slope of the bevel mountain formed substantially on the end face of the spectacle lens is used , and one bevel of this grindstone is pressed against one of the bevel peaks. The end surface processing method of the spectacle lens which grind | polished one slope of this and then grind | polishes the other slope of the said bevel mountain using the other slope of the said grindstone . The method for processing an end face of a spectacle lens according to claim 1,
The grindstone is used for end face processing of spectacle lenses in which one surface is convex and the opposite surface is concave, and is called the first angle with respect to a vertical line drawn on the axis of the grindstone in the axial direction of the grindstone surface. A bevel groove that is composed of an inclined surface having an inclination angle and polishes the bevel on the inclined surface;
A relief formed on the outer side of the bevel groove continuously with the inclined surface of the bevel groove and called a second angle with respect to a vertical line drawn on the axis of the grindstone, and having a larger inclination angle than the first angle possess a surface, wherein the grinding wheel axis direction of width of said flank positioned on the concave side of the spectacle lens relative to the V-shaped groove, the flank of the grinding wheel axis direction width positioned on the convex side of the eyeglass lens A method for processing an end face of a spectacle lens, characterized by being wider than that of the eyeglass lens. In the end face processing method of the spectacle lens in which the end face of the spectacle lens is finished with a bevel, a bevel polishing grindstone having a bevel groove having a shape corresponding to the bevel is used.
First, the top position of the bevel mountain on the spectacle lens end face is shifted to the back side of the spectacle lens from the bottom position of the bevel groove of the grindstone to polish the margin on the back side of the spectacle lens end face,
Then, the top position of the bevel mountain at the finish of the spectacle lens end face is matched with the bottom position of the bevel groove of the grindstone, and the machining margin left uncut with the bevel mount surface side of the spectacle lens end face is polished,
A method for processing an end face of a spectacle lens in which a bevel end face of the spectacle lens is mirror-finished. When polishing the surface side of the eyeglass lens end surface and the remaining machining allowance,
The position of the top of the bevel mountain on the end surface of the spectacle lens is shifted slightly to the surface side of the spectacle lens from the coincidence with the bottom position of the bevel groove of the grindstone so as to increase the pressure contact force to the grindstone surface. The method for processing an end face of a spectacle lens according to claim 3 . The method of processing an end face of a spectacle lens according to claim 1 , wherein the relative movement of the spectacle lens with respect to the grindstone is performed by movement of the spectacle lens.

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