EP1606078A1 - Procede de detourage d un verre de lunette - Google Patents
Procede de detourage d un verre de lunetteInfo
- Publication number
- EP1606078A1 EP1606078A1 EP04742330A EP04742330A EP1606078A1 EP 1606078 A1 EP1606078 A1 EP 1606078A1 EP 04742330 A EP04742330 A EP 04742330A EP 04742330 A EP04742330 A EP 04742330A EP 1606078 A1 EP1606078 A1 EP 1606078A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lens
- face
- points
- coordinates
- meridian
- 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 23
- 238000009966 trimming Methods 0.000 title claims abstract description 20
- 238000012937 correction Methods 0.000 claims description 14
- 230000002596 correlated effect Effects 0.000 claims description 2
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 claims 1
- 230000007704 transition Effects 0.000 claims 1
- 238000003754 machining Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000000875 corresponding effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001191 orthodromic effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 239000000523 sample Substances 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
- 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
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/22—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation
-
- 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
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
-
- 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
Definitions
- the present invention relates to the machining of an outline of spectacle lens to adapt it to the frame circle which is to receive it.
- a spectacle lens called a lens, whether or not it is corrective, comes from a part which has all the optical qualities required for its use and in particular an optical center which will be called center of the lens. This part is most often of circular outline, of a sufficient diameter so that one can register there all the possible forms of periphery corresponding to the immense variety of the circles or entourages of frames existing on the market.
- Trimming is the machining operation which consists in making the contour of the lens adapted to the shape of the frame which receives it.
- This peripheral machining implements a tool in which the lens is clamped in the vicinity of its center between two holding accessories and in general driving in rotation of the lens around an axis which passes through it, while a grinding wheel realizes generally in two phases, the desired contour.
- the lens clamping accessories are in the form of pads which, pressed against the two concave and convex faces of the lens, generate stresses and deformations of the latter. The machining of the contour is therefore carried out on a lens deformed under stress which, in the relaxed state, will affect a different shape therefore a different contour from that machined.
- the invention therefore relates to a method for carrying out the precise trimming of a lens in order to allow its mounting in a determined frame circle, according to which the lens is held between two clamping pads, in a defined and known position in a reference frame linked to the pads and the grinding of the periphery of the lens is controlled along a trajectory whose programmed end part corresponds on the lens to the shape of the frame circle.
- the method comprises:
- the statement of the coordinates of the points of the deformed face will be carried out after a rough outline has been produced.
- the deformation of the lens under the effect of tightening, varies with the amount of material involved and in particular with the dimension along the radius of this lens.
- there are different deformations of the lens depending on whether the periphery of the latter is near or far from the center.
- the mathematical representation of the shape of the face of the lens is carried out by the mathematical approximation of the shape of at least one meridian arc of this lens, that is to say say the line of the surface (for example convex) of the lens which runs between the center of this one and any point of this surface (one could say the orthodromic arc between the center and the point considered) and in particular a point of the programmed contour of the frame circle in the undeformed state of the lens.
- the first reading comprises the probing of the points of the above-mentioned face of the lens belonging to at least one meridian arc, in an area close to the above-mentioned trace, in order to determine a mathematical approximation of the shape of this meridian arc
- the second reading concerns points of this meridian arc already palpated in order to determine a mathematical approximation of the shape of this arc, correlated to the first approximation
- the calculation and the correction aforementioned consist in calculating the value of the coordinates of the point of the meridian arc belonging to the programmed contour of the circle of ture in the mathematical representation of the meridian arc under deforming stress and to correct the terminal part of the trajectory of the grinding wheel by a coefficient drawn from the difference between the programmed coordinates and the calculated coordinates of this point of intersection.
- the programmed contour of the mounting circle actually corresponds to a cylindrical envelope whose generatrices, parallel to the axis of tightening of the lens, build on this outline.
- generatrices parallel to the axis of tightening of the lens, build on this outline.
- a clipping of the glass requires the creation of a relief on the edge of the lens (either in the hollow for the passage of a strapping link or in a bump to enter the bezel of the frame circle).
- This relief is produced by the shape of the edge of the grinding wheel which must therefore be controlled in position along the above-mentioned direction in order to keep it always opposite the edge of the lens. To allow this piloting and this in a precise way, it is therefore advisable to ver the coordinates of the points of the projection of the contour programmed on the lens and in particular the coordinate along the tightening axis of each of these points.
- This reading can be carried out under one or the other of the tightening conditions of the lens and by a calculation carried out from this reading and mathematical representations of the probing surface of the lens, the parameters of this piloting in position along the tightening direction to take account of the deformation of the lens during its trimming. These parameters are in addition to those which, as said previously, determined the final trajectory of the grinding wheel in the control of the machine.
- FIG. 1 is a diagram illustrating a device for trimming a spectacle lens
- FIG. 2 is a diagram illustrating the different phases of the method according to the invention. DETAILED DESCRIPTION OF THE INVENTION
- a substantially circular lens 1 is clamped between two pads 2 and 3 so that it can be rotated about an axis 4 which passes through the center C of the lens 1.
- the pads 2 and 3 are fitted with known clamping cylinders 5, one of which is rotated around the axis 4 in the direction A.
- a grinding wheel 6 for trimming the lens is carried by a support 7 capable of moving it away or bringing it closer (arrow B) to the axis 4 according to a defined program. nor by the contour 8 which it is sought to obtain, and of course the angular displacement of this lens around the axis 4.
- the trimming device also comprises a probing unit 9 thanks to which the coordinates can be noted in the reference system of the device, of a plurality of points belonging for example to the convex face la of the lens 1.
- the probing device 9 makes it possible to note the coordinates of the points belonging to the contour 8 that it is sought to obtain, that is to say to the trace of the contour of the frame on the face 1a of the lens 1 when the this one is not subjected to any constraint, therefore in a condition of weak tightening between the pads 2 and 3 represented by the part 2A of figure 2.
- the coordinates of arcs such as 10, 11, 12 and 13 which are orthogonal meridian arcs extending in the vicinity of the above trace 8.
- the meridians 10, 12 and 11, 13 are intersecting at the point of intersection of the convex face la of the lens with the axis 4 passing through the center C.
- the trimming is done conventionally, that is to say that the displacement relative to the axis 4 of the grinding wheel 6 is programmed to progressively reach the profile 8 which has been previously entered into the machine by a copying of the periphery of the chosen frame reported in the reference of the machine, therefore of the lens.
- the feeler device 9 makes it possible to specify the coordinate along the axis 4 of each point of the final contour of the lens in order to control the position of the grinding wheel along this axis for carrying out a lief on the edge of the lens.
- the invention consists of a method which makes it possible to obtain the desired profile by trimming the deformed lens under stress. To do this, a plurality of points are taken, two meridian arcs 10, 12 and 13, 11 in a state of weak tightening of the lens which does not cause its deformation. This reading is carried out with the probing device 9 and the coordinates of the points, known in the reference system of the apparatus represented in FIG. 1, make it possible to obtain a mathematical representation in this reference system, of the meridians which comprise on the one hand the arcs 10, 12 and on the other hand the arcs 11, 13.
- This mathematical representation can be for example a circle which will be one of the large circles of the convex surface la of the lens if the latter is spherical or which can be a mathematical approximation of polynomial form of degree four for example. We have in fact realized that this refinement was sufficient for the precision that we seek in the dimensions of lenses to be obtained.
- the device 9 in addition to the probing of the meridian arcs, the device 9 proceeds to probing the trace 8 on the lens in its second tightening condition, which makes it possible to determine a law of variation (non-linear interpolation) of the coefficient of correction between two noted meridians.
- a refinement of the method according to the invention consists in carrying out the readings on the lens deformed by a strong pressure between the pads 2 and 3, after having carried out a rough grinding of the lens.
- a strong pressure between the pads 2 and 3 there may be along the contour 8 to be obtained, to remove a lot of material at the periphery of the lens.
- the removal of this material modifies the deformation of the lens with equal tightening so that the readings made before any grinding as in part 2B of FIG. 2, can turn out to be different from those which one realizes after having roughed the part and thus lead to a mathematical representation of the lens which is not representative of the real state of the lens in end of trimming, therefore lead to an incorrect correction of the grinding path.
- part 2C of Figure 2 there is shown the lens 1 which has undergone a rough roughing.
- the second probing on, for example, the meridian arcs is carried out on the lens thus pre-cut with the drawback that the meridian arcs are no longer very long, in particular outside the final contour, which can lead to poorer accuracy.
- the final contour obtained was much closer to the desired contour than when the probing of the lens was carried out. deformed as in part 2B of FIG. 2.
- part 2C of this figure there are the same references as those previously used to designate identical elements.
- This part 2C of FIG. 2 shows the probe 9 describing on the lens in its second tightening condition, the programmed theoretical trajectory corresponding to the contour 8 of the frame circle in the frame of reference of the lens. It can be seen that the location of the probing does not correspond to the corrected trajectory, which introduces an error in the position of the grinding wheel in the direction of axis 4, this error resulting in an incorrectly placed relief on the edge of the lens.
- the mathematical representation of the lens in the two tightening states makes it possible to provide the reading 8 with the correction Z which is suitable for correct machining of the edge of the lens.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- Glass Melting And Manufacturing (AREA)
- Glass Compositions (AREA)
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0303764A FR2852877B1 (fr) | 2003-03-27 | 2003-03-27 | Procede de detourage d'un verre de lunette |
| FR0303764 | 2003-03-27 | ||
| PCT/FR2004/000720 WO2004087373A1 (fr) | 2003-03-27 | 2004-03-24 | Procede de detourage d'un verre de lunette |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1606078A1 true EP1606078A1 (fr) | 2005-12-21 |
| EP1606078B1 EP1606078B1 (fr) | 2011-08-03 |
Family
ID=32947206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04742330A Expired - Lifetime EP1606078B1 (fr) | 2003-03-27 | 2004-03-24 | Procede de detourage d un verre de lunette |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US7253974B2 (fr) |
| EP (1) | EP1606078B1 (fr) |
| JP (1) | JP4050766B2 (fr) |
| KR (1) | KR100707944B1 (fr) |
| CN (1) | CN100443261C (fr) |
| AT (1) | ATE518621T1 (fr) |
| FR (1) | FR2852877B1 (fr) |
| WO (1) | WO2004087373A1 (fr) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5073338B2 (ja) * | 2007-03-28 | 2012-11-14 | 株式会社ニデック | レンズ固定用カップ |
| CN101391389B (zh) * | 2007-09-21 | 2012-05-23 | 鸿富锦精密工业(深圳)有限公司 | 滚圆装置及滚圆方法 |
| FR2940161B1 (fr) * | 2008-12-19 | 2010-12-31 | Essilor Int | Dispositif et procede d'usinage d'une lentille ophtalmique |
| FR2950161B1 (fr) * | 2009-09-14 | 2011-10-07 | Essilor Int | Procede d'elaboration d'une consigne de detourage d'une lentille ophtalmique en vue de son montage sur une monture de lunettes semi-cerclee. |
| FR2962676B1 (fr) * | 2010-07-13 | 2012-08-03 | Essilor Int | Procede de detourage d'une lentille ophtalmique de lunettes comportant un film de revetement. |
| CN102172869B (zh) * | 2011-03-30 | 2013-06-19 | 铁道第三勘察设计院集团有限公司 | 基于可视化的轨道板数控磨床优化打磨方法 |
| JP5342665B2 (ja) | 2012-03-12 | 2013-11-13 | ファナック株式会社 | 渦巻き状計測経路に沿って計測を行うレンズ形状加工方法およびレンズ形状加工装置 |
| TWI739569B (zh) * | 2019-09-06 | 2021-09-11 | 明達醫學科技股份有限公司 | 眼鏡鏡片加工裝置之校正方法 |
| KR20240009936A (ko) * | 2021-05-17 | 2024-01-23 | 가부시키가이샤 니데크 | 상태 관리 프로그램 및 상태 관리 방법 |
| CN113971262B (zh) * | 2021-10-22 | 2023-05-05 | 西南交通大学 | 一种钻尖容屑槽磨削轨迹计算方法 |
| CN116373132A (zh) * | 2023-05-15 | 2023-07-04 | 中山市光维智能科技有限公司 | 一种镜片的异形切割方法、装置及存储介质 |
| CN116713821B (zh) * | 2023-06-19 | 2025-10-28 | 西南交通大学 | 圆弧头立铣刀端刃前刀面与容屑槽连续磨削轨迹计算方法 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06325697A (ja) * | 1993-05-14 | 1994-11-25 | Matsushita Electron Corp | カラー・プラズマディスプレイパネル |
| JP3241241B2 (ja) * | 1995-08-09 | 2001-12-25 | 三菱重工業株式会社 | 中空ガスタービン翼 |
| JP3730406B2 (ja) * | 1998-04-30 | 2006-01-05 | 株式会社ニデック | 眼鏡レンズ加工装置 |
| US6325697B1 (en) * | 1999-11-24 | 2001-12-04 | Glassline Corporation | CNC machine tools |
| CN1223436C (zh) * | 2002-08-07 | 2005-10-19 | 刘康 | 一种光学镜片的研磨方法及装置 |
-
2003
- 2003-03-27 FR FR0303764A patent/FR2852877B1/fr not_active Expired - Fee Related
-
2004
- 2004-03-24 US US10/551,237 patent/US7253974B2/en not_active Expired - Lifetime
- 2004-03-24 WO PCT/FR2004/000720 patent/WO2004087373A1/fr not_active Ceased
- 2004-03-24 KR KR1020057018050A patent/KR100707944B1/ko not_active Expired - Fee Related
- 2004-03-24 JP JP2005518717A patent/JP4050766B2/ja not_active Expired - Fee Related
- 2004-03-24 AT AT04742330T patent/ATE518621T1/de not_active IP Right Cessation
- 2004-03-24 EP EP04742330A patent/EP1606078B1/fr not_active Expired - Lifetime
- 2004-03-24 CN CNB2004800081982A patent/CN100443261C/zh not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2004087373A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100443261C (zh) | 2008-12-17 |
| US20070097525A1 (en) | 2007-05-03 |
| FR2852877A1 (fr) | 2004-10-01 |
| KR20060005347A (ko) | 2006-01-17 |
| KR100707944B1 (ko) | 2007-04-13 |
| EP1606078B1 (fr) | 2011-08-03 |
| JP2006514584A (ja) | 2006-05-11 |
| WO2004087373A1 (fr) | 2004-10-14 |
| CN1764518A (zh) | 2006-04-26 |
| JP4050766B2 (ja) | 2008-02-20 |
| FR2852877B1 (fr) | 2005-05-06 |
| ATE518621T1 (de) | 2011-08-15 |
| US7253974B2 (en) | 2007-08-07 |
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