EP1871572A1 - Verfahren zur maschinellen bearbeitung einer fläche einer in der mitte prismaförmigen ophthalmischen linse - Google Patents

Verfahren zur maschinellen bearbeitung einer fläche einer in der mitte prismaförmigen ophthalmischen linse

Info

Publication number
EP1871572A1
EP1871572A1 EP06726064A EP06726064A EP1871572A1 EP 1871572 A1 EP1871572 A1 EP 1871572A1 EP 06726064 A EP06726064 A EP 06726064A EP 06726064 A EP06726064 A EP 06726064A EP 1871572 A1 EP1871572 A1 EP 1871572A1
Authority
EP
European Patent Office
Prior art keywords
machining
tool
ophthalmic lens
axis
rotation
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
Application number
EP06726064A
Other languages
English (en)
French (fr)
Other versions
EP1871572B1 (de
Inventor
Alexandre Gourraud
Loïc QUERE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EssilorLuxottica SA
Original Assignee
Essilor International Compagnie Generale dOptique SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Essilor International Compagnie Generale dOptique SA filed Critical Essilor International Compagnie Generale dOptique SA
Priority to PL06726064T priority Critical patent/PL1871572T3/pl
Publication of EP1871572A1 publication Critical patent/EP1871572A1/de
Application granted granted Critical
Publication of EP1871572B1 publication Critical patent/EP1871572B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • 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
    • B24B13/0012—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor for multifocal lenses
    • 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
    • B24B13/04—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor grinding of lenses involving grinding wheels controlled by gearing
    • B24B13/046—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor grinding of lenses involving grinding wheels controlled by gearing using a pointed tool or scraper-like tool
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T82/00—Turning
    • Y10T82/10—Process of turning
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T82/00—Turning
    • Y10T82/25—Lathe
    • Y10T82/2502—Lathe with program control

Definitions

  • the invention relates to the field of manufacturing ophthalmic lenses intended to be inserted into a spectacle frame adapted to correct the view of a wearer.
  • It relates more particularly to a method of machining a face of such an ophthalmic lens.
  • the manufacture of an ophthalmic lens generally comprises a first phase during which is produced by molding and / or machining a blank having an edge delimited by a front face and a rear face, and a second phase during which the blank is cut off, that is to say that its edge is machined to move to a shape suitable for insertion into a given spectacle frame.
  • correction properties corresponding to the prescription of the future wearer are conferred on the ophthalmic lens by the shape and the relative dispositions of the front and rear faces.
  • Some ophthalmic lenses in particular so-called “progressive” lenses correcting presbyopia, have an asymmetrical front face or rear face with respect to the longitudinal axis of the cylinder formed by the edge of the uncut lens.
  • this face can be machined on the blank by the implementation of a conventional turning method, the blank being rotated about said axis while a machining tool comes into contact with the lens to machine this symmetrical face.
  • Another solution allows the implementation of a turning process for machining on the blank an asymmetrical face. This is a process in which the ophthalmic lens is rotated about the longitudinal axis traversing the faces of the lens while a machining tool is synchronized with the angular position of the ophthalmic lens in such a way that to follow the asymmetrical shape that it must machine on the lens.
  • the object of the invention is to improve this type of process.
  • the invention provides a method of machining a face of an ophthalmic lens comprising a main machining step during which the position of a machining tool is synchronized with the angular position of the ophthalmic lens driven in rotation about an axis of rotation transverse to said face so as to machine on said face an asymmetric surface with respect to the axis of rotation of the ophthalmic lens, this method being characterized in that it comprises a complementary step of machining a recess around the axis of rotation of the ophthalmic lens.
  • a machining method makes it possible to erect a centrally prismatic surface on a lens driven in rotation by minimizing or even eliminating the residual volume of material responsible for a reverse machining phenomenon.
  • the surface to be machined is asymmetrical around of the axis of rotation of the lens, that is to say that the normal to the surface at the point of intersection with the axis of rotation of the lens forms an angle with said axis of rotation.
  • said recess defines a portion of said asymmetrical surface.
  • Said complementary machining step may also be carried out by means of the machining tool, or else by means of a tool distinct from the machining tool.
  • said complementary machining step is performed without synchronizing the position of a tool for machining the recess with the angular position of the ophthalmic lens rotated.
  • the tool for machining the recess is in contact with the ophthalmic lens only during an angular portion of the rotation of the ophthalmic lens.
  • the machining of the recess can be achieved by moving a tool towards the axis of rotation of the ophthalmic lens.
  • the advance of said tool can be stopped when the center of the tool is positioned on the axis of rotation of the ophthalmic lens.
  • the recess may include an edge passing through the axis of rotation of the ophthalmic lens.
  • a residual volume of material is adapted to be machined downwards by the machining tool during the main machining step, this residual volume being substantially centered with respect to the axis of rotation of the ophthalmic lens. This residual volume can be machined during the main machining step or, conversely, the main machining step can be stopped before machining said residual volume.
  • FIG. 1 and 2 show a progressive ophthalmic lens, respectively seen in profile and viewed from above, which can be obtained by a method according to the invention
  • FIG. 3 is a perspective view schematically showing a machining tool adapted to co-operate in turning with a cylindrical part prismée driven in rotation;
  • Figures 4 and 5 show the machining tool of Figure 3, respectively seen in profile and seen from the front;
  • FIGS. 6 and 7 schematically represent two working modes of the tool of FIGS. 4 and 5, respectively a nominal mode and a countdown mode;
  • Figure 8 shows schematically the machining tool and the prismed surface of Figure 3;
  • FIG. 9 shows a machining phase of the surface prismed by the tool
  • FIG. 10 shows the same machining phase as FIG. 9, after the prism piece has been rotated 180 °;
  • FIGS. 12 to 17 show chronologically the complementary step of machining a recess of the machining method according to the invention
  • FIGS. 18 to 22 show chronologically the step of the machining method according to the invention which follows said complementary step of FIGS. 12 to 17;
  • FIGS. 24 to 27 show chronologically a machining operation of the surface prismed by the tool without prior machining of a recess
  • Figure 28 shows the residual volume of material to be machined with the tool running backwards, in the case of the machining operation of Figures 24 to 27.
  • Figures 1 and 2 show the shape of a progressive ophthalmic lens 1.
  • the top view of Figure 2 shows that the lens 1 has a circular contour. This circular contour will then be machined to match the contour of the eyeglass frame chosen.
  • FIG. 1 shows the typical profile of such a progressive lens 1.
  • This lens 1 comprises a rear face 2 whose curvature is regular, as well as a front face 3 whose curvature strongly increases in a particular zone of the lens. 1.
  • the lens 1 therefore has no rotational symmetry with respect to a longitudinal axis 4 passing through the center of the circular contour of the lens 1.
  • this face 3 can be obtained by turning only by synchronizing the position of a machining tool with the angular position of the ophthalmic lens rotated about the axis 4.
  • blade 5 ' a blank 5 1 having a prismed surface 6.
  • the operations that will be described by way of example below are to remove by machining a layer of material 7 of constant thickness from the prismed surface 6 of the crude 5 'during turning operations using a tool 8 associated with a tool holder 9.
  • the crude 5 ' is rotated in the direction 10 about an axis 4' while the tool 8 is movable in the direction 11 parallel to the axis 4 'and in the direction 12 transverse to the axis 4 .
  • a not shown turning device is adapted to drive the stock 5 'in rotation in the direction 10 and to synchronize the position of the tool 8 in the direction 11 with this rotation, as explained below.
  • the normal 13 to the prismed surface 6 does not extend along the axis 4 ', which is a consequence of the asymmetry of this surface 6 with respect to the axis 4'.
  • the machining tool 8 shown in Figure 3 is shown in detail in Figures 4 and 5, respectively of profile and face.
  • This tool 8 has a generally circular shape and has a working face 14 forming a cutting edge with a lateral bevel 15 connecting the working face 14 to a rear face 16 having a smaller diameter than the working face 14.
  • This tool 8 is held in a tool holder 9, in accordance with FIG. 3, by a screw (not shown) fixing the center 17 of the tool 8 to the tool holder 9, or by any means making it possible to rigidly connect the tool 8 to the tool holder 9 so that the cutting edge is available on at least a portion of the circumference of the tool 8 for machining the stock 5 '.
  • the tool 8 may be made of polycrystalline diamond, monocrystalline diamond, or any other material suitable for producing a turning tool.
  • Figures 6 and 7 show the turning tool 8 respectively in a so-called “nominal” cutting configuration and in a so-called “reverse” cutting configuration.
  • FIG. 6 shows that, in the nominal cutting configuration, the mill 5 'to be machined is rotated in the direction 18 and the tool 8 is positioned so that its cutting edge attacks the layer 7 to be removed by its working face 14 producing chips 19.
  • This configuration is the one for which such a tool 8 has been provided.
  • FIG. 7 shows the tool 8 in the same position as that of FIG. 6, while the stock 5 'is rotated in the direction 18' which is the opposite of the direction 18 of FIG. 6.
  • the tool 8 works here in reverse, that is to say that the layer 7 of material to be removed is attacked by the bevel 15 and not by the working face 14. In this configuration, these chips 19 'are still produced and the layer 7 of material is effectively removed but it is an improper use of the tool 8 may cause premature wear, or even immediate damage to the cutting edge of the tool 8.
  • the tool 8 must therefore be used to the maximum in its nominal configuration rather than in its backward configuration.
  • Figure 8 is a schematic view showing the elements of Figure 3, namely the tool 8 (here without its tool holder 9 to simplify the drawing), the surface 6 of the crude 5 'and the layer 7 of material to machine schematized between the solid line and the dotted line.
  • the prismed surface 6 is rotated around the axis 4 '.
  • FIG. 10 shows the machining of the layer 7 by the tool 8 while the crude 5 'has rotated 180 ° relative to its position of Figure 9, during its continuous drive in rotation.
  • This FIG. 10 shows that the tool 8, to continue the machining of the layer 7 at the machining line 20, has moved parallel to the axis of rotation 4 'by a distance dependent on the asymmetry of the surface 6.
  • This machining technique allows the tool 8 to be permanently in contact with the layer 7 of material to be machined (although it is asymmetric) driven in rotation, and this thanks to the synchronization of the position of the tool 8 with the angular position of the crude 5 '.
  • FIG. 11 thus combines, according to said representation, FIGS. 9 and 10.
  • the machining line is shown in bold when the tool 8 is working in nominal mode (example FIG. 11), and is represented in lines. hatched when the tool 8 is working backward (example Figure 21)
  • a first step is to machine a recess around the axis of rotation 4 'of the crude 5'.
  • Tool 8 is at this effect used first in conventional turning, that is to say without synchronizing the position of the tool 8 with the angular position of the crude 5 '.
  • the tool 8 is thus approached to the surface 6 along the axis 4 '.
  • the tool 8 enters the raw material 5 'whereas the center 17 of the tool 8 is at a distance from the axis 4' substantially equal to the radius of the tool 8.
  • penetration of the tool 8 in the raw material 5 ' is carried out according to a height adapted to the thickness of the layer 7 of material to be removed (see the position 8B of the tool 8), that is to say the desired depth of pass.
  • This penetration into the material of the tool 8 being performed according to a conventional turning operation applied to a prismed surface 6, the tool 8 comes to perform the machining operation (position 8B) and is sometimes placed at the distance from surface 6 (position 8A).
  • the tool 8 is then moved in the direction of the axis of rotation 4 'while following a machining height adapted to the thickness of the layer 7 so as to form the recess 22 in FIG. as it moves.
  • the recess 22 is then continued until the tool 8 arrives in the central position, that is to say that its center 17 comes to be positioned on the axis 4 '(see FIGS. 15 and 16).
  • Figure 17 shows the recess 22 produced by the operation of Figures 12-16.
  • Figure 18 shows the penetration of the tool 8 in the raw material 5 'following the layer 7 of material to be machined.
  • Figure 19 shows the progress of the tool 8 towards the axis 4 '.
  • the tool 8 in its position 8A, enters a machining area down. Indeed, the tool in its 8A position layer 7 in nominal mode along a machining line 23 and also processes back the layer 7 along a machining line 24 located on the other side of the axis 4 '.
  • FIG. 21 shows the progression of the tool 8 which finishes machining the layer 7 only until the tool 8 reaches the position of FIG. 22 in which the machining of the layer 7 is finished.
  • FIG. 23 shows the residual volume of material of the layer 7 which remains to be machined before the tool 8 begins to work backwards, that is to say just after the position of FIG. 25 shown in FIG. 23 is therefore the volume which will be machined downwards by the tool 8.
  • FIG. 24 shows the machining by a tool 26 of a layer 27 of material to be machined on a stock 28. This machining is performed by synchronizing the position of the tool 26 with the angular position of the stock 28. This figure 24 is the last position of the tool 26 before the beginning of a work in progress since a portion of the machining line 26, at its position 26A, will pass on the other side of the rotation axis 29 crude 28.
  • FIG. 24 shows the machining by a tool 26 of a layer 27 of material to be machined on a stock 28. This machining is performed by synchronizing the position of the tool 26 with the angular position of the stock 28.
  • This figure 24 is the last position of the tool 26 before the beginning of a work in progress since a portion of the machining line 26, at its position 26A, will pass on the other side of the rotation axis 29 crude 28.
  • FIG. 24 shows the machining by a tool 26 of a layer 27 of material to be machined on a stock 28. This machining is performed
  • the tool 26 works in nominal machining in its position 26B along a machining line 30 while it is working, at its position 26A, firstly in nominal machining along a line of machining 31 on one side of the axis 29 and, on the other hand, in machining down a machining line 32 on the other side of the axis 29.
  • Figure 28 shows the residual volume 33 of the layer 27 which, from the position of Figure 24, is machined with the tool 26 working backwards.
  • the pass height f of the residual volume 33 corresponds to the pass depth defining the layer 7 and is much greater than the height f of the residual volume of the process according to the invention (see FIG. 23).
  • the method according to the invention therefore allows a significant reduction of the machined volume down when using such a turning technique where the position of a tool is synchronized with the angular position of the rough to be machined.
  • the difference between the residual volume of the process according to the invention and the residual volume 33 is such that, thanks to the method according to the invention, the machining tool works very little in reverse. Since the residual volume 25 is also considerably smaller than the residual volume 33, this residual volume 25 may alternatively be left as it is or polished during an additional operation. The machining tool therefore does not work at all backwards according to this variant.
  • FIGS. 3 to 22 have been described with reference to the machining of a layer 7 of material of regular thickness on a flat prismed surface 6, the process according to the invention is applicable. understood to produce an ophthalmic lens according to Figures 1 and 2 by removing a layer of material of irregular thickness of a crude 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Eyeglasses (AREA)
  • Turning (AREA)
  • Milling Processes (AREA)
  • Laser Beam Processing (AREA)
EP06726064A 2005-03-17 2006-03-10 Verfahren zur maschinellen bearbeitung einer fläche einer in der mitte prismaförmigen ophthalmischen linse Active EP1871572B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06726064T PL1871572T3 (pl) 2005-03-17 2006-03-10 Sposób obróbki powierzchni soczewki okulistycznej pryzmatowanej w środku

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0502651A FR2883215B1 (fr) 2005-03-17 2005-03-17 Procede d'usinage d'une face de lentille optalmique prismee au centre
PCT/FR2006/000533 WO2006097606A1 (fr) 2005-03-17 2006-03-10 Procede d’usinage d’une face de lentille ophtalmique prismee au centre

Publications (2)

Publication Number Publication Date
EP1871572A1 true EP1871572A1 (de) 2008-01-02
EP1871572B1 EP1871572B1 (de) 2009-11-25

Family

ID=35229614

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06726064A Active EP1871572B1 (de) 2005-03-17 2006-03-10 Verfahren zur maschinellen bearbeitung einer fläche einer in der mitte prismaförmigen ophthalmischen linse

Country Status (13)

Country Link
US (1) US8215210B2 (de)
EP (1) EP1871572B1 (de)
JP (1) JP5020226B2 (de)
CN (1) CN101142054B (de)
AT (1) ATE449667T1 (de)
AU (1) AU2006224447B2 (de)
BR (1) BRPI0609013B1 (de)
CA (1) CA2601536C (de)
DE (1) DE602006010680D1 (de)
FR (1) FR2883215B1 (de)
PL (1) PL1871572T3 (de)
PT (1) PT1871572E (de)
WO (1) WO2006097606A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2263831A1 (de) 2009-06-15 2010-12-22 Essilor International (Compagnie Générale D'Optique) Verfahren zur Bearbeitung einer optischen Linsenoberfläche

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US3662040A (en) * 1970-01-08 1972-05-09 Uroptics International Inc Technique for lathe grinding multifocal contact lenses
GB2117300B (en) * 1982-03-22 1985-09-04 Sira Institute Method and apparatus for producing aspherical surfaces
US4852436A (en) * 1987-11-16 1989-08-01 Hughes Aircraft Company Cam-controlled turning machine
SU1759563A1 (ru) * 1990-07-26 1992-09-07 Центральное Конструкторское Бюро Уникального Приборостроения Научно-Технического Объединения Ан Ссср Устройство дл обработки асферических поверхностей точением
JP3026824B2 (ja) * 1990-07-31 2000-03-27 株式会社メニコン 非球面レンズの製造装置
RU2004996C1 (ru) * 1990-12-13 1993-12-30 Новосибирский институт инженеров геодезии, аэрофотосъемки и картографии Устройство дл обработки асферических поверхностей
US5148632A (en) * 1991-06-14 1992-09-22 Corning Incorporated Cavity forming in plastic body
FR2706800B1 (de) * 1993-06-25 1995-11-03 Essilor Int
US5440798A (en) * 1994-01-18 1995-08-15 Gentex Optics, Inc. Method of making concave aspheric bifocal mold component
CN2291992Y (zh) * 1995-05-29 1998-09-23 汪胜生 高速散光眼镜片研磨抛光机床
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JP2005001100A (ja) * 2003-02-21 2005-01-06 Seiko Epson Corp 非球面加工方法及び非球面形成方法
US7160174B2 (en) * 2005-06-01 2007-01-09 Asphericon Gmbh Method for processing and measuring rotationally symmetric workpieces as well as grinding and polishing tool
JP2006326833A (ja) * 2006-07-10 2006-12-07 Seiko Epson Corp 非球面加工方法
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Also Published As

Publication number Publication date
FR2883215B1 (fr) 2008-11-07
JP5020226B2 (ja) 2012-09-05
DE602006010680D1 (de) 2010-01-07
AU2006224447B2 (en) 2011-01-20
WO2006097606A8 (fr) 2007-10-18
JP2008532783A (ja) 2008-08-21
CN101142054B (zh) 2010-08-11
EP1871572B1 (de) 2009-11-25
AU2006224447A1 (en) 2006-09-21
ATE449667T1 (de) 2009-12-15
PL1871572T3 (pl) 2010-05-31
BRPI0609013A2 (pt) 2010-11-16
BRPI0609013A8 (pt) 2018-07-31
FR2883215A1 (fr) 2006-09-22
US8215210B2 (en) 2012-07-10
WO2006097606A1 (fr) 2006-09-21
CA2601536A1 (fr) 2006-09-21
PT1871572E (pt) 2010-01-26
CA2601536C (fr) 2014-09-16
US20080190254A1 (en) 2008-08-14
BRPI0609013B1 (pt) 2019-07-30
CN101142054A (zh) 2008-03-12

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