EP2550130B1 - Process for controlling the polishing process of an optical element - Google Patents

Process for controlling the polishing process of an optical element Download PDF

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Publication number
EP2550130B1
EP2550130B1 EP11706250.5A EP11706250A EP2550130B1 EP 2550130 B1 EP2550130 B1 EP 2550130B1 EP 11706250 A EP11706250 A EP 11706250A EP 2550130 B1 EP2550130 B1 EP 2550130B1
Authority
EP
European Patent Office
Prior art keywords
depth
polishing
cavities
cavity
reference value
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.)
Active
Application number
EP11706250.5A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2550130A2 (en
Inventor
Xavier Bultez
Benoît CALLIER
José De BARROS
Eric Gacoin
Alexandre Gourraud
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 EP11706250.5A priority Critical patent/EP2550130B1/en
Priority to PL11706250T priority patent/PL2550130T3/pl
Publication of EP2550130A2 publication Critical patent/EP2550130A2/en
Application granted granted Critical
Publication of EP2550130B1 publication Critical patent/EP2550130B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • B24B13/06—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, the tool or work being controlled by information-carrying means, e.g. patterns, punched tapes, magnetic tapes
    • 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
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation

Definitions

  • the invention relates to a process for controlling the polishing process of an optical element, such an ophthalmic lens.
  • polishing is meaning in fact the smoothing and the polishing per se.
  • the smoothing consists to suppress material on a depth comprised between 50 and 200 microns, and, after smoothing, the polishing per se consists to suppress material on a depth comprised between 3 and 50 microns.
  • Ophthalmic lenses require high quality standard, therefore high quality manufacturing process is to be used in order to obtain high quality ophthalmic lenses.
  • Cast molding requires the use of two complementary molds in which the lens material is added by gravity casting. These molds present a specific design corresponding to the desired lens design. Therefore, new manufacturing techniques including cutting specially digital surfacing and polishing steps are used.
  • a finished lens is usually made from a semi-finished lens blank by using new technologies like digital surfacing.
  • Semi-finished lens blanks have usually optically finished front surfaces. Then, they are cut, polished and coated to produce finished uncut lenses. Finished uncut lenses are then edged to the proper frontal shape and edge contour to fit into spectacle/glasses frames or other mounting structures.
  • calculations are required to determine the topography of the surfaces of the lens, namely its back surface if semi-finished lens blank is used. Such calculations typically involve variables that include the front surface radii of the semi-finished blank, the index of refraction of the lens blank material, prescription values of the desired lens, statutory values regarding minimum lens thickness, and the physical dimensions of the frame or mounting structure.
  • the surface is then polished and coated to produce a surface of optical quality.
  • the optically finished lens is then edged to the proper shape and edge profile to fit into or with the frame for which the lens was made.
  • the goal of the present invention is to provide a mechanical process for controlling the polishing process of an optical element, specially an ophthalmic lens or an ophthalmic mold, which is efficient, simple and rapid to use in workstation.
  • the document US-A-6 558 586 discloses a process for measuring and/or controlling a polishing process of an ophthalmic element comprising the steps of manufacturing a cavity on the surface of the element to be polished, operating the polishing process, and considering the element, in order to check that the cavity is suppressed.
  • the invention relates to a process for measuring and/or controlling a polishing process of an ophthalmic element comprising the steps of
  • ophthalmic element it is understood ophthalmic lens or ophthalmic mold.
  • the process for controlling a polishing process of an ophthalmic element comprises the steps of:
  • two sets of cavities are manufactured, the constant depth of the first set being smaller than said reference value and the constant depth of the second set being greater than said reference value.
  • a plurality of cavities can be manufactured, with different depths according to a predetermined increment.
  • Said pitch is preferably comprised between 0,5 and 10 microns.
  • Said cavities can be holes disposed according a regular geometric form.
  • said cavities can be disposed in its near vision zone.
  • Said cavities are disposed in its far vision zone.
  • Said cavities are disposed in its progression corridor, between its far vision zone and its near vision zone.
  • Said cavities are grooves.
  • the process for measuring a polishing process of an ophthalmic element comprises the steps of:
  • the figure 6 is a view in vertical section of an ophthalmic element.
  • Figures 7 to 9 are front views of an ophthalmic element, illustrating a process of measuring a polishing process, according to the invention.
  • the process for controlling a polishing process of a surfaced ophthalmic element 1 comprising the steps of:
  • the reference value is comprised between 15 and 20 microns and the depth of the first holes 2 is equal to 15 microns and the depth of the second holes 3 is equal to 20 microns.
  • the process of controlling permit to check that the depth of the material suppressed by polishing is effectively comprised between 15 and 20 microns. In other case, if some second holes 3 are suppressed or if some first holes 2 are always present, the polishing process presents a defect.
  • the precision of the controlling can be increased by manufacturing of a plurality of holes, with different depths according to a predetermined increment, preferably comprised between 0,5 and 10 microns.
  • the holes can be advantageously linear grooves, preferably disposed according a regular geometric form, for example according to concentric circles, squares or diameters. They could present specific sections, for example with form of cross, in order to be differentiated easily.
  • the figure 3 illustrates such second embodiment, where the surface have a revolution symmetry and where a plurality of holes G i is manufactured according to several radius, associated to a set of constant distances to the center of the ophthalmic element, with different depths according to a predetermined increment, for example equal to 1 micron.
  • the element After polishing, the element is as illustrated in the figure 4 , the present holes demonstrate that the polishing is not uniform and that the quantity of material suppressed by polishing is smaller in the vicinity of the edges of the element and higher in the vicinity of the centre of the element.
  • the controlling is made in critical places of the ophthalmic element.
  • the figure 5 illustrates such case of a progressive ophthalmic lens.
  • the holes or the grooves can be disposed in its near vision zone and/or in its far vision zone.
  • the holes or the grooves G i are disposed in the progression corridor PW, between the far zone and the near zone of the lens.
  • the holes or grooves can be manufactured by means of a laser or mechanically. They can be manufactured directly in the generating or cutting machine.
  • the final determination of the subsisting holes or grooves can be made by a simple visualization, by means of an arc lamp in reflective or transmissive mode or by means of a camera.
  • the process according to the invention can be applied to an ophthalmic lens or to a mold to manufacture it.
  • the invention concerns also a more basic process that comprises the steps of:
  • this embodiment of process does not give a complete control, it can be applied in order to control the polishing in some specific cases, for example when the polishing is supposed to suppress a quantity of material too small or too great, or when the uniformity of the polishing is to control.
  • the reference value X of the depth p of the material to be suppressed by polishing is not constant for one cut ophthalmic element 1 and the invention proposes for measuring a polishing in order to determine the reference surface L of polishing, as represented on the figure 6 .
  • this variable depth is comprised between 50 and 200 microns for the step of smoothing and between 3 and 50 microns for the step of polishing per se.
  • the process for measuring a polishing process of an ophthalmic element 1, for example in order to determine the formed reference surface L comprises the steps of:
  • the process to determinate the reference surface L consists to choose some points P i on the cut element and to realise a plurality of micro-holes MH j around and in vicinity of these points.
  • the number of holes is at least equal to 1 + higher natural value of maximal depth - minimal depth / increment , with maximal depth equal to 200 microns and minimal depth equal to 50 microns, for smoothing, with maximal depth equal to 50 microns and minimal depth equal to 3 microns, for polishing per se.
  • Each hole of this plurality of holes has a different depth from one micron to twenty microns, with a regular increment equal to one micron.
  • the element is then polished with a correct and controlled process and according to the present holes, the reference value X in said points can be defined with a precision of one micron, as illustrated on figures 8 and 9 .
  • Such process can be used by repartition of each plurality of holes of different ophthalmic elements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
EP11706250.5A 2010-03-25 2011-03-03 Process for controlling the polishing process of an optical element Active EP2550130B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP11706250.5A EP2550130B1 (en) 2010-03-25 2011-03-03 Process for controlling the polishing process of an optical element
PL11706250T PL2550130T3 (pl) 2010-03-25 2011-03-03 Sposób kontrolowania procesu polerowania elementu optycznego

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP10305300 2010-03-25
PCT/EP2011/053139 WO2011117050A2 (en) 2010-03-25 2011-03-03 Process for controlling the polishing process of an optical element
EP11706250.5A EP2550130B1 (en) 2010-03-25 2011-03-03 Process for controlling the polishing process of an optical element

Publications (2)

Publication Number Publication Date
EP2550130A2 EP2550130A2 (en) 2013-01-30
EP2550130B1 true EP2550130B1 (en) 2014-05-07

Family

ID=42537652

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11706250.5A Active EP2550130B1 (en) 2010-03-25 2011-03-03 Process for controlling the polishing process of an optical element

Country Status (6)

Country Link
US (1) US20130065489A1 (pl)
EP (1) EP2550130B1 (pl)
CN (1) CN103097079B (pl)
PL (1) PL2550130T3 (pl)
PT (1) PT2550130E (pl)
WO (1) WO2011117050A2 (pl)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9044839B2 (en) * 2012-09-26 2015-06-02 Apple Inc. Method for measuring material removal during surface finishing on curved surfaces
US12622470B1 (en) * 2024-03-12 2026-05-12 CERE Creations, LLC Breast support garment

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1471351A (en) * 1921-04-04 1923-10-23 American Optical Corp Lens
US3414272A (en) * 1966-03-11 1968-12-03 John B. Rogers Jr. Piston rings
US4019289A (en) * 1976-02-23 1977-04-26 Clayton Paul Korver Replaceable lens surfacing pad with integral wear indicating pattern
US5077941A (en) * 1990-05-15 1992-01-07 Space Time Analyses, Ltd. Automatic grinding method and system
JP2000011327A (ja) * 1998-06-29 2000-01-14 Fujitsu Ltd 薄膜ヘッドスライダの加工方法及び加工装置
US6558586B1 (en) * 2000-03-06 2003-05-06 Essilor International (Compagnie Generale D'optique) Process for fabricating a surface of an ophthalmic lens, installation for implementing the process and ophthalmic lens obtained by the process
US7008310B2 (en) * 2001-08-01 2006-03-07 Entegris, Inc. Wafer carrier wear indicator
TWI252793B (en) * 2002-08-20 2006-04-11 Nanya Technology Corp Wear auto-display polishing pad and fabricating method of the same
JP4105622B2 (ja) * 2003-11-05 2008-06-25 株式会社永田製作所 研摩装置及び被研材の厚さ判定方法
US8591716B2 (en) * 2005-08-26 2013-11-26 Panasonic Corporation Process of making a semiconductor optical lens and a semiconductor optical lens fabricated thereby
US20090008794A1 (en) * 2007-07-03 2009-01-08 Weng-Jin Wu Thickness Indicators for Wafer Thinning
JP2009018399A (ja) * 2007-07-13 2009-01-29 Nitta Haas Inc 研磨パッド
CN100591478C (zh) * 2008-06-16 2010-02-24 中国航空工业第一集团公司第六一三研究所 控制中空透镜中心厚度尺寸的方法

Also Published As

Publication number Publication date
WO2011117050A3 (en) 2013-02-21
US20130065489A1 (en) 2013-03-14
WO2011117050A2 (en) 2011-09-29
CN103097079A (zh) 2013-05-08
PL2550130T3 (pl) 2014-09-30
CN103097079B (zh) 2016-01-06
EP2550130A2 (en) 2013-01-30
PT2550130E (pt) 2014-07-17

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