EP2846969A1 - Procede de detourage d'une lentille ophtalmique multicouche - Google Patents
Procede de detourage d'une lentille ophtalmique multicoucheInfo
- Publication number
- EP2846969A1 EP2846969A1 EP13725418.1A EP13725418A EP2846969A1 EP 2846969 A1 EP2846969 A1 EP 2846969A1 EP 13725418 A EP13725418 A EP 13725418A EP 2846969 A1 EP2846969 A1 EP 2846969A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ophthalmic lens
- roughing
- contour
- finishing
- preliminary
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
- B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
- B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
- B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
- B24B13/0031—Machines having several working posts; Feeding and manipulating devices
- B24B13/0037—Machines having several working posts; Feeding and manipulating devices the lenses being worked by different tools, e.g. for rough-grinding, fine-grinding, polishing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/0076—Other grinding machines or devices grinding machines comprising two or more grinding tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
- B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
- B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
- B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
- B24B9/146—Accessories, e.g. lens mounting devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
- B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
- B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
- B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
- B24B9/148—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms electrically, e.g. numerically, controlled
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
Definitions
- the present invention relates generally to the preparation of multilayer ophthalmic lenses (that is to say having a substrate and at least one coating film which is made of a material distinct from that of the substrate. and which covers a main face of the substrate) for mounting in spectacle frames.
- It relates more particularly to a method of trimming an ophthalmic lens according to a desired contour, comprising:
- a step of roughing the ophthalmic lens by means of a roughing wheel according to a rough outline coincident with or widened with respect to the desired contour
- a finishing step of the ophthalmic lens by means of a finishing tool A finishing step of the ophthalmic lens by means of a finishing tool.
- Such a film can be used for various reasons, in particular to improve the optical comfort of the ophthalmic lens or to increase the optical performance thereof.
- it may be a film of micro-cells which makes it possible to confer on the ophthalmic lens properties of photochromism or of index variation.
- the pre-roughing step of the trimming process which is exposed to it consists in cutting the lens by means of a cutter, on the thickness of the film only and in a preliminary outline narrowed relative to the desired contour.
- the roughing and finishing steps are conventionally operated using form grinding wheels.
- This sidewalk is particularly unattractive. It is also more unsightly that the film has a different color than the substrate. It can even generate unpleasant optical effects for the wearer of glasses.
- the cutting of the film by the cutter also generates waves along the edge of the film, which creates an effect of lace also unattractive.
- the present invention proposes a method of careful trimming of a multilayer ophthalmic lens.
- a method of trimming as defined in the introduction wherein said preliminary contour is widened relative to the desired contour and wherein it is expected that the blank wheel used has a particle size included between 0.1 and 0.5 mm and that it is controlled relative to the ophthalmic lens so as to apply during said roughing step a radial force on the ophthalmic lens between 0.1 and 5 Newton.
- the roughing and finishing steps make it possible to erase the traces that the pre-roughing step might possibly have left on the ophthalmic lens.
- the Applicant has experienced said combination of particle size and radial force used to rough the lens, and thus observed that it makes it possible to reduce as much as possible the stresses exerted on the useful part of the film of the lens and that it thus concur (with the pre-roughing step) to avoid any detachment and / or delamination of the film.
- said finishing tool used is a grinding wheel having a particle size of between 0.02 and 0.1 mm, driven relative to said ophthalmic lens according to the desired contour, so as to apply during said finishing step a radial force on the ophthalmic lens between 5 and 18 Newton;
- said finishing tool is controlled relative to said ophthalmic lens for machining said ophthalmic lens in at least three passes;
- said polishing tool used is a grinding wheel having a particle size of between 0.0005 and 0.02 mm, controlled relative to said ophthalmic lens so as to apply during said polishing step a radial force on the ophthalmic lens of between 10.0 and 0.02 mm; and Newton;
- said polishing tool is controlled relative to said ophthalmic lens for machining said ophthalmic lens in at least three passes;
- said preliminary tool being a milling cutter
- said pre-roughing step consists of cutting the ophthalmic lens over the entire thickness of the coating film and only a part of the thickness of the substrate, according to the preliminary outline;
- the outline of the blank is widened with respect to the preliminary outline; said roughing step is carried out in the presence of a lubricant;
- said pre-roughing step is performed in the presence of a lubricant, according to the preliminary outline;
- FIG. 1 and 2 are schematic views of two embodiments of an ophthalmic lens trimming apparatus
- FIGS. 3A and 3B are schematic side and front views of an ophthalmic lens before trimming
- FIGS. 4A and 4B are schematic side and front views of the ophthalmic lens shown in FIGS. 3A and 3B, as it appears at the end of a pre-roughing step operated according to a trimming method according to a first embodiment of the invention;
- FIGS. 5A and 5B are schematic side and front views of the ophthalmic lens shown in FIGS. 4A and 4B, as it appears at the end of a roughing step operated according to the first embodiment of the trimming method according to the invention;
- FIGS. 6A and 6B are schematic side and front views of the ophthalmic lens shown in FIGS. 5A and 5B, as it appears at the end of a finishing step;
- FIGS. 7A and 7B are schematic side and front views of the ophthalmic lens shown in FIGS. 3A and 3B, as it appears at the end of a pre-roughing step operated according to a trimming method according to a second embodiment of the invention.
- FIGS. 8A and 8B are schematic side and front views of the ophthalmic lens shown in FIGS. 7A and 7B, as it appears at the end of a roughing step operated according to the second embodiment of the clipping method according to the invention.
- FIGs 1 and 2 there is shown schematically two embodiments of a trimming apparatus adapted to cut an ophthalmic lens. These embodiments are for illustrative purposes and other commercially available trimmers may be used for the practice of the present invention.
- a trimming apparatus can be made in the form of any cutting or removal machine capable of modifying the contour of the ophthalmic lens to adapt it to a frame selected by the future wearer of the pair of spectacles.
- the trimming apparatus is constituted, in a manner known per se, by an automatic grinder 200, commonly called a digital grinder.
- This grinder includes in this case:
- rocker 201 which is mounted freely pivotally about a reference axis A5, in practice a horizontal axis, on a frame not shown, and which supports the ophthalmic lens 100 to be machined;
- a set of wheels 214 which is set in rotation on a grinding wheel axis A6 parallel to the reference axis A5, which is also properly rotated by a motor not shown;
- a finishing module 220 which is rotatably mounted around the wheel axis A6, and which includes including finishing tools of the ophthalmic lens 100.
- the latch 201 is equipped with a lens support here formed by two shafts and rotation drive 202, 203 of the ophthalmic lens 100 to be machined.
- Each of the shafts 202, 203 has a free end which faces the other and is equipped with a locking nose of the ophthalmic lens 100.
- a first of the two shafts 202 is fixed in translation along the blocking axis A7.
- the second of the two shafts 203 is instead movable in translation along the blocking axis A7 to effect the compression in axial compression of the ophthalmic lens 100 between the two locking noses.
- the wheel set 214 here comprises four wheels 210, 21 1, 212, 213 mounted coaxially on the grinding wheel axis A6, each designed for a specific machining operation of the ophthalmic lens 100.
- the grinding wheel 214 comprises in particular a grinding wheel 210 cylindrical in revolution around the wheel axis A6.
- This roughing wheel 210 comprises diamonds whose particle size is between 0.1 and 0.5 mm and is here equal to 0.3 mm.
- the wheel set 214 also comprises a beveling wheel 21 1, so-called form.
- This grinding wheel 21 1 has a generally cylindrical shape of revolution around the wheel axis A6, with however a central groove (not visible in the figures), V-section and revolution around the wheel axis A6 . This central groove thus makes it possible to machine a rib on the field of the ophthalmic lens 100 to be machined.
- This beveling wheel 21 1 comprises diamonds whose particle size is between 0.02 and 0.1 mm and is here equal to 0.06mm.
- the grinding wheel 214 comprises two polishing grinding wheels whose shapes are respectively identical to those of the roughing grinding wheel 210 and of bevelling 21 1, but whose diamonds have particle sizes of between 0.0005 and 0.02 mm, here equal to 0.005mm.
- the set of wheels 214 is carried by a carriage, not shown, mounted to move in translation along the grinding wheel axis A6.
- the translational movement of the trolley is called "transfer" TRA.
- the grinder 200 further comprises a connecting rod 230, one end of which is articulated relative to the frame for pivoting about the reference axis A5, and the other end of which is articulated with respect to a nut 231 for pivoting around an axis A8 parallel to the reference axis A5.
- the nut 231 is itself mounted to move in translation along a restitution axis A9 perpendicular to the reference axis A5. As shown schematically in Figure 1, the nut 231 is a threaded nut threaded engagement with a threaded rod 232 which, aligned along the axis of restitution A9, is rotated by a motor 233.
- the link 230 further includes a force sensor 234 that interacts with a corresponding element of the latch 201.
- the pivot angle of the rod 230 about the reference axis A5 is then linearly associated with the vertical translation, denoted RES (for "restitution"), of the nut 231 along the restitution axis A9.
- the ophthalmic lens 100 to be machined When, duly sandwiched between the two shafts 202, 203, the ophthalmic lens 100 to be machined is brought into contact with one of the wheels of the train of mills 214, it is subject to an effective removal of material.
- the radial force applied by the grinding wheel on the ophthalmic lens can then be controlled precisely, thanks to the force sensor 234.
- the finisher 220 has a pivotal mobility around the wheel axis A6, called pivot mobility PIV. Specifically, the finisher 220 is provided with a gear (not shown) which meshes with a pinion equipping the shaft of an electric motor integral with the wheel trolley. This mobility allows it to move closer to or away from the ophthalmic lens 100. This electric motor is controlled in position and effort, so as to precisely control the force applied by the finishing tools on the ophthalmic lens 100.
- the finisher 220 here embeds a stud 224 which supports the finishing tools and which is adapted to pivot about a finishing axis A10 orthogonal to the wheel axis A6.
- This mobility referred to as FIN finishing mobility, makes it possible to orient the finishing tools with respect to the lens 100.
- This stud 224 more precisely supports here a disc-shaped creasing wheel 222 and a milling cutter 223, both driven in rotation. around the same axis perpendicular to said finishing axis A10.
- the ophthalmic lens 100 When, duly sandwiched between the two shafts 202, 203, the ophthalmic lens 100 is brought into contact with the milling cutter 223 or the creasing wheel 222, it is also effectively removed from the material.
- pivoting movements of the pad 224, pivoting of the finishing module 220, restitution of the latch 201 and rotation of the shafts 202, 203 are then controlled in coordination by the control unit 251.
- This control unit 251 is of electronic and / or computer and allows in particular to measure the radial force applied by the grinding wheels and finishing tools on the ophthalmic lens and to control:
- the driving motor in rotation of the stud according to the finishing mobility FIN.
- the grinder 200 finally comprises a human-machine interface 252 which here comprises a display screen 253, a keyboard 254 and a mouse 255 adapted to communicate with the control unit 251.
- This interface GUI 252 allows the user to enter numerical values or to acquire various data in the form of electronic files, in order to control accordingly the grinder 200.
- the grinder 200 has an identical architecture to that of the grinder shown in Figure 1, with the difference that it is devoid of finishing module 200.
- FIGS. 3A and 3B show an ophthalmic lens 100 that has not yet been cut away, of an indifferent type (convergent, divergent, non-corrective, etc.).
- this ophthalmic lens 100 is a multilayer lens, in that it comprises a substrate 101 and a coating film 102 which covers the substrate 101.
- the substrate 101 is made of a first material, for example mineral glass or organic glass, that is to say polymer.
- It has two main faces 104, 106, including a rear face 104 intended to be turned towards the eye of the wearer, and a front face 106 opposite.
- the coating film 102 is designed to present specific physico-chemical or optical properties, such as, for example, reflection, hydrophobicity, birefringence, polarization, absorption in certain wavelength ranges such as ultra-violet or certain wavelengths that are visible to give a particular color to the lenses, or anti-shock, anti-scratch, anti-reflective or anti-fouling properties.
- specific physico-chemical or optical properties such as, for example, reflection, hydrophobicity, birefringence, polarization, absorption in certain wavelength ranges such as ultra-violet or certain wavelengths that are visible to give a particular color to the lenses, or anti-shock, anti-scratch, anti-reflective or anti-fouling properties.
- the film 102 may be composed of a single layer, or several layers of coating having distinct properties.
- This material is preferably plastic and transparent.
- the film 102 also has two main faces 103, 107, including a rear face 107 intended to be turned towards the eye of the wearer, and an opposite front face 103.
- This film 102 is fixed by its rear face 107 on the front face 106 of the substrate 101, for example by gluing.
- the rear face 104 of the substrate 101 thus forms the rear face of the ophthalmic lens 100, while the front face 103 of the film 102 forms the front face of the ophthalmic lens 100.
- the wafers of the substrate 101 and the film 102 together form the wafer. 105 of the ophthalmic lens 100.
- An average plane P1 is defined with respect to the ophthalmic lens 100 as being the plane passing through the peripheral edge of the rear face 104 of the ophthalmic lens 100.
- a central axis A1 is also defined as being the axis orthogonal to the mean plane P1, which passes through the center of the rear face 104 of the ophthalmic lens 100.
- This ophthalmic lens 100 is intended to be cut off so that its contour adapts to the shape of the eyeglass frame selected by the wearer.
- rimmed eyeglass frames there are three main categories of spectacle frames that can be selected by the wearer. Among these, there are rimmed eyeglass frames, semi-rimmed eyeglass frames (also called snap frames). arcades) and eyeglass frames without a circle (also called pierced frames).
- the rimmed eyeglass frames conventionally comprise two surrounds which are intended to each accommodate a cut-away ophthalmic lens. These two surrounds are connected to each other by a trigger guard and each carry a branch. Each surround has a groove, commonly called a bezel, running along its inner face.
- the ophthalmic lens 100 When the selected eyeglass frame is a rimmed frame, the ophthalmic lens 100 must be cut off so as to present along its wafer 105 an engagement ridge 109 (see FIG. 6A), commonly called a bevel, the section of which here presents a V.
- the bevel 109 thus formed on the edge 105 of the lens 100 is then adapted to fit into the bezel of the rimmed frame.
- the semi-rimmed spectacle frames have two arches on the inner faces of which ribs extend, and two holding wires which are connected to the ends of the arches to form with them closed contours.
- the ophthalmic lens 100 When the selected spectacle frame is a half-rimmed frame, the ophthalmic lens 100 must be cut off so as to have a circumferential groove along its edge 105. The lens is then held in place in the eyeglass frame by fitting the upper portion of its wafer in the rib provided along the inner face of the corresponding arch, and engaging the holding wire in the groove.
- the frames of glasses without circle have two branches and a trigger guard, but are devoid of entourage or arcade.
- These branches and this bridge are, on the other hand, provided with lugs adapted to be inserted into drill holes previously made in the ophthalmic lenses.
- the ophthalmic lens 100 When the selected spectacle frame is a half-rimmed frame, the ophthalmic lens 100 must be cut off so as to present a wafer 105 whose section is straight and then pierced so that the trigger guard can be fixed therein and the corresponding branch of the spectacle frame.
- the lens Ophthalmic 100 has an initial contour Co of circular shape.
- the ophthalmic lens 100 To adapt to the shape of the eyeglass frame chosen by the future wearer of glasses, the ophthalmic lens 100 must then be cut to a desired contour C3.
- this desired contour C3 corresponds to the closed curve according to which it is desired to cut the apex of the bevel 109 of the ophthalmic lens 100 so that the latter fits perfectly into the corresponding environment of the eyeglass frame.
- this desired contour would correspond to the closed curve according to which it would be desirable to cut the edge of the lens.
- the desired contour C3 is centered on the central axis A1.
- the ophthalmic lens must be cut out so as to fit into a circle surrounded by a rimmed eyeglass frame.
- the latter Prior to the trimming of the ophthalmic lens 100, the latter is placed between the shafts 202, 203 of the grinder, such that its central axis A1 coincides with the axis of these shafts.
- the clipping of the ophthalmic lens 100 is then operated in at least three steps, including:
- the clipping method also comprises a subsequent polishing step.
- the optician has a grinder 200 of the type shown in FIG.
- control unit 251 has in memory the thickness at the center of the lens, the thickness of the film 102, and a mapping of the front faces 103 and rear 104 of the lens.
- the control unit 251 co-ordinates the pivoting movements of the pad 224, the pivoting of the finishing module 220, the restitution of the rocker 201 and the rotation of the shafts. 202, 203 so that the cutter 223 cuts through its free end the ophthalmic lens 100 over the entire thickness of the coating film 102 and only a part of the thickness of the substrate 101, according to the preliminary outline C1 (see FIG. Figures 4A and 4B).
- the cutter is more particularly controlled to machine the substrate to a depth of 0.2 millimeters, which ensures a complete cutting of the film 102 over its entire thickness.
- the film 102 is thus cut into two distinct parts, including a central portion 102A and a peripheral portion 102B.
- the preliminary contour C1 (which corresponds to the contour of the central portion 102A of the film 102) according to which the cutter 223 is driven is in turn deduced from a mathematical operation for widening the desired contour C3.
- Various mathematical enlargement operations can be used, such as, for example, a homothety operation with a ratio strictly greater than 1.
- the enlargement operation simply consists in defining the preliminary outline C1 by a plurality of points Pu whose coordinates are noted (pu, ⁇ , Zu) and are calculated in the following way:
- Pu p. + k, k being a predetermined constant of between 0.1 and 0.9 millimeters, here equal to 0.3 millimeters;
- the roughing wheel 210 (whose particle size is equal to 300 micrometers) is used in order to return the initially circular contour Co of the lens to the shape of an intermediate contour C2 close to the desired contour C3 (see FIGS. 5A and 5B).
- This intermediate contour C2 is derived from a desired contour widening mathematical operation C3, which is such that the intermediate contour C2 is distinct and surrounds the preliminary outline C1.
- the widening operation simply consists in defining the intermediate contour C2 by a plurality of points P 2, i whose coordinates are noted (p2, i, 62, 1 , Z 2 , i) and are calculated from the following way:
- P 2 , i pi + s, s being a predetermined constant greater than k, here equal at 0.6 millimeters;
- the roughing wheel 210 and the rocker 201 are then driven relative to each other so as to reduce, for each angular position of the lens around the locking axis A7, the radius of the lens at a length equal to the radius p 2 , i, which is strictly greater than the radius p-ij.
- the stresses applied by the roughing wheel 210 on the ophthalmic lens 100 propagate in the film 102 to the groove machined by the cutter and do not reach the central portion 102A. of the film 102, which then makes it possible to avoid any delamination of the central portion 102A of the film 102.
- a single pass of the roughing wheel 210 around the ophthalmic lens 100 is here performed during this roughing step.
- This roughing operation is carried out here in the presence of a lubricant, for example in the presence of water, so as to reduce the amount of dust generated by the machining of the lens, to prevent the roughing wheel 210 from clogs, and to limit the smells emitted.
- a lubricant for example in the presence of water
- the beveling wheel 21 1 (whose particle size is equal to 60 micrometers) is used in order to bring the intermediate contour C2 of the ophthalmic lens to the desired contour C3, by making the bevel 109 appear on the field 105 of the lens (see FIGS. 6A and 6B).
- the grinder 200 is then controlled so that the radial force applied by the beveling wheel 21 1 on the ophthalmic lens 100 remains invariably equal to a constant between 5 and 18 Newton, here equal to 10 Newton.
- the beveling wheel 21 1 and the rocker 201 are then driven relative to each other so as to reduce, for each angular position of the lens around the locking axis A7, the radius of the top of the bevel 109 of the lens to a length equal to the radius p ,.
- this finishing step is performed in three passes of the grinding wheel. bevel 21 1 around the ophthalmic lens 100, in the presence of water.
- this step makes it possible to erase the traces left by the pre-roughing operation, and in particular the groove machined by the cutter.
- the polishing wheel 213 (whose shape is identical to that of the beveling wheel 21 1 and whose particle size is equal to 5 micrometers) is used.
- the grinder 200 is then controlled so that the radial force applied by the polishing wheel 213 on the ophthalmic lens 100 remains here invariably equal to a constant between 10 and 35 Newton, here equal to 20 Newton.
- the combination of particle size and radial force used during this step here also makes it possible to avoid any delamination of the ophthalmic lens 100.
- this finishing step is performed in three passes of the beveling wheel 21 1 around the ophthalmic lens 100 in the presence of water.
- the lens 100 is then extracted from the grinder 200 by means of the translational mobility of the second shaft 203, and is then fitted into the corresponding surround of the selected spectacle frame.
- the optician has a grinder 200 of the type shown in FIG.
- the roughing wheel 210 (whose particle size is equal to 300 micrometers) is then used in order to bring the initially circular contour Co of the lens to a contour close to the desired contour C3. which is called preliminary outline C1 'and which is widened relative to the desired contour C3 (see FIGS. 7A and 7B).
- the grinder 200 is then controlled so that the radial force applied by the roughing wheel 210 on the ophthalmic lens 100 remains invariably equal to a value between 0.1 and 5 Newton, here equal to 2.5 Newton .
- the operation of widening the desired contour C3 to obtain the preliminary contour C1 ' consists of calculating the coordinates (p3 63 Z,) of a plurality of points P3J as follows:
- P3, i Pi + t, t being a predetermined constant of between 1 and 2 millimeters, here equal to 1.5 millimeters;
- the roughing wheel 210 and the rocker 201 are then driven relative to each other so as to reduce, for each angular position of the lens around the locking axis A7, the radius of the lens at a length equal to the radius p 3ii .
- this pre-roughing step is performed in a single pass of the rough grinding wheel 210 around the ophthalmic lens 100, in the presence of water.
- the combination of particle size and radial force used during this step makes it possible to reduce at best the delamination phenomenon of the ophthalmic lens 100.
- the presence of water here also makes it possible to reduce the amount of dust generated by machining the lens, to prevent the roughing wheel 210 from becoming clogged, and to limit the odors emitted.
- the roughing wheel 210 (whose particle size is equal to 300 micrometers) is again used to bring the contour of the lens to the desired contour C3 (see FIGS. 8A and 8B).
- the grinder 200 is then controlled so that the radial force applied by the roughing wheel 210 on the ophthalmic lens 100 remains invariably equal to a value between 0.1 and 5 Newton, here equal to 2.5 Newton .
- the roughing wheel 210 and the rocker 201 are then driven relative to each other so as to reduce, for each angular position of the lens around the locking axis A7, the radius of the lens at a length equal to the radius p ,.
- this roughing step is performed in a single pass of the roughing wheel 210 around the ophthalmic lens 100, in the absence of lubricant.
- the combination of grain size and radial force used during this step makes it possible to reduce the delamination phenomenon of the ophthalmic lens 100 at best.
- the absence of lubricant then allows to totally prevent the appearance of this phenomenon.
- the quantity of dust generated and the odors emitted by the machining of the lens are then very small, since the quantity of material to be machined between the preliminary outline C1 'and the desired contour C3 is reduced.
- finishing and polishing steps are then performed in the same manner as in the first embodiment of the invention mentioned above.
- the finishing step will comprise:
- a second creasing operation consisting of practicing along the field of the ophthalmic lens a groove by means of the creasing grinding wheel on the finisher of the grinder.
- the finishing step will comprise:
- a second drilling operation consisting of drilling holes through the lens, by means of the cutter, so as to attach the lugs of the branches and the bridge of the eyeglass frame.
- one and / or the other of the pre-roughing, roughing, finishing and polishing steps can be carried out by vary the force applied by the grinding wheel on the ophthalmic lens in a reduced range of values. So :
- the radial force applied by the wheel on the ophthalmic lens varies between 5 and 18 Newton;
- the radial force applied by the wheel on the ophthalmic lens varies between 10 and 35 Newton.
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- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- Eyeglasses (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1201333A FR2990369B1 (fr) | 2012-05-09 | 2012-05-09 | Procede de detourage d'une lentille ophtalmique multicouche |
| PCT/FR2013/050988 WO2013167831A1 (fr) | 2012-05-09 | 2013-05-03 | Procede de detourage d'une lentille ophtalmique multicouche |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2846969A1 true EP2846969A1 (fr) | 2015-03-18 |
| EP2846969B1 EP2846969B1 (fr) | 2016-07-06 |
Family
ID=48534435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13725418.1A Active EP2846969B1 (fr) | 2012-05-09 | 2013-05-03 | Procede de detourage d'une lentille ophtalmique multicouche |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US9475166B2 (fr) |
| EP (1) | EP2846969B1 (fr) |
| CN (1) | CN104271313B (fr) |
| FR (1) | FR2990369B1 (fr) |
| WO (1) | WO2013167831A1 (fr) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031694B (zh) * | 2017-06-08 | 2022-04-29 | 依视路国际公司 | 待机加工以形成待安装在眼镜架上的眼科镜片的半成品镜片、组合及与其相关的方法 |
| CN112589592B (zh) * | 2020-12-07 | 2022-09-30 | 吴通 | 一种将镜片加工至可适用于眼镜镜片的装置 |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3922821A (en) * | 1973-09-14 | 1975-12-02 | American Optical Corp | Grinding method and coolant therefor |
| US3894361A (en) * | 1974-09-03 | 1975-07-15 | Dimelp Optical Co Inc | Lens grinding machine |
| DE3804133A1 (de) * | 1988-02-11 | 1989-08-17 | Wernicke & Co Gmbh | Verfahren und einrichtung zur formgebung eines brillenglases |
| DE9214644U1 (de) * | 1992-10-28 | 1993-02-11 | Wernicke & Co GmbH, 4000 Düsseldorf | Schleifvorrichtung |
| DE19503432A1 (de) * | 1994-02-14 | 1995-09-21 | Wernicke & Co Gmbh | Vorrichtung zur Randbearbeitung von Brillengläsern |
| DE19738668A1 (de) * | 1997-09-04 | 1999-03-18 | Wernicke & Co Gmbh | Brillenglasrandbearbeitungsmaschine |
| JP3688449B2 (ja) * | 1997-09-24 | 2005-08-31 | 株式会社ニデック | 眼鏡レンズ研削装置及び眼鏡レンズ研削方法 |
| GB9726981D0 (en) * | 1997-12-22 | 1998-02-18 | Rolls Royce Plc | Method and apparatus for grinding |
| JP2001191239A (ja) * | 1999-12-28 | 2001-07-17 | Asahi Diamond Industrial Co Ltd | レンズ芯取り用ホイール |
| FR2887168B1 (fr) * | 2005-06-16 | 2007-08-31 | Essilor Int | Procede et dispositif de detourage biseaute d'une lentille ophtalmique de lunettes |
| FR2900853B1 (fr) | 2006-05-10 | 2009-01-23 | Essilor Int | Procede et dispositif de detourage d'une lentille glissante par decoupage de ladite lentille |
| FR2912335B1 (fr) * | 2007-02-13 | 2009-04-17 | Essilor Int | Machine de detourage d'une lentille de lunettes,pourvue d'un porte-outils tournant sur lequel sont montes plusieurs outils de travail |
| FR2962676B1 (fr) * | 2010-07-13 | 2012-08-03 | Essilor Int | Procede de detourage d'une lentille ophtalmique de lunettes comportant un film de revetement. |
| FR2964336B1 (fr) * | 2010-09-07 | 2012-09-14 | Essilor Int | Procede de detourage d'une lentille ophtalmique |
| FR2980387B1 (fr) * | 2011-09-26 | 2013-09-27 | Essilor Int | Procede de detourage d'une lentille ophtalmique |
| JP6063325B2 (ja) * | 2013-03-28 | 2017-01-18 | Hoya株式会社 | レンズ加工方法、レンズ加工プログラムおよび加工制御装置 |
-
2012
- 2012-05-09 FR FR1201333A patent/FR2990369B1/fr active Active
-
2013
- 2013-05-03 WO PCT/FR2013/050988 patent/WO2013167831A1/fr not_active Ceased
- 2013-05-03 US US14/399,715 patent/US9475166B2/en active Active
- 2013-05-03 EP EP13725418.1A patent/EP2846969B1/fr active Active
- 2013-05-03 CN CN201380023888.4A patent/CN104271313B/zh active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2013167831A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104271313A (zh) | 2015-01-07 |
| WO2013167831A1 (fr) | 2013-11-14 |
| US20150140905A1 (en) | 2015-05-21 |
| US9475166B2 (en) | 2016-10-25 |
| CN104271313B (zh) | 2017-06-09 |
| FR2990369A1 (fr) | 2013-11-15 |
| EP2846969B1 (fr) | 2016-07-06 |
| FR2990369B1 (fr) | 2014-08-29 |
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