EP2550130A2 - Process for controlling the polishing process of an optical element - Google Patents
Process for controlling the polishing process of an optical elementInfo
- Publication number
- EP2550130A2 EP2550130A2 EP11706250A EP11706250A EP2550130A2 EP 2550130 A2 EP2550130 A2 EP 2550130A2 EP 11706250 A EP11706250 A EP 11706250A EP 11706250 A EP11706250 A EP 11706250A EP 2550130 A2 EP2550130 A2 EP 2550130A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- depth
- cavities
- polishing
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000007517 polishing process Methods 0.000 title claims abstract description 30
- 230000003287 optical effect Effects 0.000 title description 5
- 238000004519 manufacturing process Methods 0.000 claims abstract description 21
- 238000005498 polishing Methods 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 12
- 230000000750 progressive effect Effects 0.000 claims description 6
- 208000001491 myopia Diseases 0.000 claims description 5
- 238000009499 grossing Methods 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000005266 casting Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
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 invention relates to a process for measuring and/or controlling a polishing process of an ophthalmic element comprising the steps of - manufacturing at least two cavities on the surface of the element to be polished, the depth of the first cavity being smaller than the depth of the second cavity
- 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:
- each hole of each plurality of holes having a different depth with a increment equal to the searched precision
- Figure 1 and 2 are views in vertical section of an ophthalmic element, illustrating a first embodiment the process according to the invention.
- Figure 3 and 4 are front views of an ophthalmic element, illustrating a second embodiment of the process according to the invention.
- Figure 5 is a front view of progressive ophthalmic lens, illustrating a third embodiment of the process according to the process according to the invention.
- 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 of smoothing being comprised between 50 and 200 microns and the reference value of polishing per se being comprised between 3 and 50 microns
- 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, 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 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 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:
- each hole M H j of each plurality of holes having a different depth with a increment equal to the searched precision
- the process to determinate the reference surface L consists to choose some points Pi on the cut element and to realise a plurality of micro-holes M Hj 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],
- 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 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)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL11706250T PL2550130T3 (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 |
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 true EP2550130A2 (en) | 2013-01-30 |
EP2550130B1 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 (en) |
EP (1) | EP2550130B1 (en) |
CN (1) | CN103097079B (en) |
PL (1) | PL2550130T3 (en) |
PT (1) | PT2550130E (en) |
WO (1) | WO2011117050A2 (en) |
Families Citing this family (1)
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 |
Family Cites Families (13)
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 (en) * | 1998-06-29 | 2000-01-14 | Fujitsu Ltd | Method and device for machining thin film head slider |
FR2805767B1 (en) * | 2000-03-06 | 2002-06-21 | Essilor Int | METHOD FOR MANUFACTURING A SURFACE OF AN OPHTHALMIC LENS, INSTALLATION FOR IMPLEMENTING THE METHOD AND OPHTHALMIC LENS OBTAINED ACCORDING TO 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 (en) * | 2003-11-05 | 2008-06-25 | 株式会社永田製作所 | Polishing apparatus and method for determining thickness of material to be polished |
KR100969988B1 (en) * | 2005-08-26 | 2010-07-16 | 파나소닉 전공 주식회사 | 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 (en) * | 2007-07-13 | 2009-01-29 | Nitta Haas Inc | Polishing pad |
CN100591478C (en) * | 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 | Method for controlling hollow lens centre thickness |
-
2011
- 2011-03-03 WO PCT/EP2011/053139 patent/WO2011117050A2/en active Application Filing
- 2011-03-03 US US13/634,069 patent/US20130065489A1/en not_active Abandoned
- 2011-03-03 PT PT117062505T patent/PT2550130E/en unknown
- 2011-03-03 CN CN201180015801.XA patent/CN103097079B/en active Active
- 2011-03-03 PL PL11706250T patent/PL2550130T3/en unknown
- 2011-03-03 EP EP11706250.5A patent/EP2550130B1/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2011117050A2 * |
Also Published As
Publication number | Publication date |
---|---|
PL2550130T3 (en) | 2014-09-30 |
WO2011117050A3 (en) | 2013-02-21 |
PT2550130E (en) | 2014-07-17 |
CN103097079A (en) | 2013-05-08 |
WO2011117050A2 (en) | 2011-09-29 |
CN103097079B (en) | 2016-01-06 |
US20130065489A1 (en) | 2013-03-14 |
EP2550130B1 (en) | 2014-05-07 |
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