EP1601496A1 - Procede d'usinage d'une lentille ophtalmique et machine d'usinage pour mettre en oeuvre la methode precedente - Google Patents
Procede d'usinage d'une lentille ophtalmique et machine d'usinage pour mettre en oeuvre la methode precedenteInfo
- Publication number
- EP1601496A1 EP1601496A1 EP04717673A EP04717673A EP1601496A1 EP 1601496 A1 EP1601496 A1 EP 1601496A1 EP 04717673 A EP04717673 A EP 04717673A EP 04717673 A EP04717673 A EP 04717673A EP 1601496 A1 EP1601496 A1 EP 1601496A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- axis
- template
- blank
- rocker
- machining
- 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
- 238000003754 machining Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000000523 sample Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 238000003825 pressing 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
- 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
- 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
- B24B13/06—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
- B24B17/00—Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like; Accessories therefor
-
- 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
- B24B17/00—Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like; Accessories therefor
- B24B17/02—Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like; Accessories therefor involving mechanical transmission means only
- B24B17/025—Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like; Accessories therefor involving mechanical transmission means only for grinding rotating workpieces (three dimensional)
- B24B17/026—Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like; Accessories therefor involving mechanical transmission means only for grinding rotating workpieces (three dimensional) for the periphery of plane workpieces, e.g. cams, lenses
Definitions
- the present invention relates to a method of machining an ophthalmic lens.
- the production of an ophthalmic lens is generally carried out by grinding a blank. This machining makes it possible to give the blank the shape of the desired lens so that the latter can be mounted in a spectacle frame circle.
- a template which takes the shape of the circle of the frame in which the lens is to take place.
- the template is mounted on the grinder as well as the blank to be machined.
- the grinder then comes to copy the shape of the template. Copying is done mechanically.
- the machining path is generated by the template which
- a digital grinder is then associated with a reader which, before machining the blank, digitizes the shape of the circle of the frame corresponding to the lens to be produced. The data thus recorded is transmitted to the grinder.
- the latter generally has three digital axes and can therefore precisely control the trajectory during machining.
- a digital grinder is a machine significantly more expensive than a template grinder, especially because of the reader associated with it.
- this reader is on the one hand sensitive and fragile and on the other hand difficult to repair.
- the present invention therefore aims to provide a process for producing a spectacle lens or an ophthalmic lens which uses only reliable tools that can be easily repaired while also providing control over machining. digital grinders.
- a method of machining an ophthalmic lens using a digital grinder or the like comprising on the one hand a first axis on which is mounted at least one grinding wheel and on the other hand a second axis on which takes place a blank to be machined to obtain the desired ophthalmic lens.
- this method comprises the following steps: a) placing on the second axis of a template corresponding to the lens that one wishes to obtain, b) bringing the template into contact with a tool placed on the first axis, c) recording of the relative position of the two axes, d) repeating steps b) and c) in order to carry out a discrete or continuous reading of the entire template, e) determination by calculation of the shape of the template, f) withdrawal the template, g) setting up a blank to be machined, h) machining the blank, and i) possible machining of a second blank.
- This process allows you to use a tool placed on the first axis of the grinder to come "read” the template taking place at the second axis.
- This tool is used as a probe and allows the means used to control the grinder to know the exact shape of the template used. Knowing this shape, these control means can act on the various tools of the grinder to produce an ophthalmic lens with the same outline as the template.
- the tool used to come into contact with the template is for example a grinding wheel subsequently used for machining the blank.
- the grinding wheel is preferably left free to rotate about its axis during the steps b) and c) above.
- the tool used can also be a specific tool used as a probe.
- One embodiment of the method according to the invention provides that for step d), after each recording, the tool and the template are moved away from each other, then rotate the template according to a predetermined increment, then put back in contact with the template with the tool to perform the following recording.
- the machining method according to the invention can for example be used with a grinder of the type comprising: a first axis on which is mounted at least one grinding wheel, a second axis parallel to the first axis and on which are centered two shafts arranged in the extension of one another and intended to maintain between them a blank to be machined, drive means for at least one of the two shafts, a rocker, pivotally mounted around a third axis parallel to the first two, and carrying the shafts intended to hold and drive the blank to be machined, a rod mounted between one end of the third axis carrying the rocker and a nut movably mounted on a fourth axis perpendicular to the previous three, means for driving the movable nut , and a stop and counter-stop system mounted on the one hand on the link and on the other hand on the rocker to limit the movement of the blank carried by the rocker towards the grinding wheel.
- Such a grinder is known to those skilled in the art.
- An advantage of the method according to the invention comes from the fact that it can be implemented with a grinder of the prior art.
- a grinder is usually used in combination with a reading system which digitizes the shape of a frame circle. With the implementation of the method according to the invention, this reading system becomes useless. It is therefore possible to obtain a machine for machining ophthalmic lenses at a lower cost while still benefiting from the advantages of a digital machine.
- steps b) to d) corresponding to the reading of the template the template rests on the tool placed on the first axis , that the jig is driven in rotation around its axis and that the relative position of the two axes is measured by detecting the movements of the rocker around its axis.
- This detection can be done for example by using an angular displacement sensor placed on the pivot axis of
- the present invention also relates to a machine for machining an ophthalmic lens of the type comprising: a first axis on which is mounted at least one grinding wheel, a second axis parallel to the first on which are centered two shafts arranged in the extension l one of the other and intended to hold between them a blank to be machined, drive means for at least one of the two shafts, a rocker pivotally mounted around a third axis parallel to the first two and carrying the shafts intended to maintain and drive the blank to be machined, a rod mounted between one end of the third axis carrying the rocker and a nut mounted mobile on a fourth axis perpendicular to the previous three, means for driving the movable nut, and a stop and counter-stop system mounted on the one hand on the link and on the other hand on the rocker to limit the movement of the blank carried by the rocker towards the wheel.
- the first axis of this machine also carries a feeler tool intended to come into contact with a jig mounted between the two shafts of the second axis, and the means for driving the movable nut comprise an encoder making it possible to know precisely the position of the nut on its fourth axis.
- the probing tool has for example the shape of a smooth disc taking the shape of a grinding wheel mounted on the first axis.
- the present invention also relates to another machine for machining an ophthalmic lens of the aforementioned type, characterized in that a pressure sensor is provided between the stop and the counter-stop of the link and rocker.
- FIG. 1 is a partial schematic perspective view of a machine for machining an ophthalmic lens that can be used for implementing a method according to the invention
- Figure 2 is a schematic view showing the main elements of the machine of Figure 1 viewed in elevation, and Figure 3 corresponds to Figure 2 in top view.
- the present invention allows the use of a digital grinder of known type as a template reader and as a grinder.
- a digital grinder of known type as a template reader and as a grinder.
- the following description presents a grinder that can be used for the implementation of the present invention and then a method according to the invention is explained in relation to the described grinder.
- Figure 1 is partially and schematically shown a machine 1 for machining an ophthalmic lens 2. It is a grinder to achieve the clipping of the lens 2, the outline of which is intended to correspond, after its grinding, with that of one of the circles of a spectacle frame (not shown).
- the grinder 1 comprises two support shafts 4, 4 'opposite which is held by pinching the lens 2. These support shafts 4, 4' are jointly driven in rotation by a first motor (not shown) around a first common axis A1. However, only one of them could be driven, while the other would be mounted to rotate freely.
- the support shafts 4, 4 ′ are mounted on a mobile support 5 called a rocker. This rocker 5 is freely pivotally mounted on a frame (not shown) of the grinder 1, around a second axis A2 parallel to the first axis A1.
- the grinder 1 further comprises a grinding wheel 6 located in line with the support shafts 4, 4 ′ and driven in rotation about a third axis A3 parallel to the preceding A1, A2.
- the movement of the lever 5 aims to bring the support shafts 4, 4 ′ closer to or further away from the grinding wheel 6, so as to give the outline of the lens 2 the desired shape, this shape being generally non-circular.
- the first motor is for example mounted on the rocker 5, the rotational movement of this first motor being transmitted to the support shafts 4, 4 ′ by motor shafts of axis A2, by means of transmission belts. This transmission could however be achieved by means of a gear mechanism.
- several grinding wheels are provided in parallel on the third axis A3, for roughing and finishing of the lens 2 to be machined.
- This grinder is digitally controlled. It comprises, according to an embodiment illustrated in FIG.
- a connecting rod 12 mounted articulated, on the one hand, by a first end 13, to the chassis around a second axis A2 of the rocker 5 and, on the other hand , by a second end 14 around a fourth axis A4 parallel to the preceding A1, A2, A3, to a nut 15 itself mounted movable in translation along a fifth axis A5, commonly known as the restitution axis, perpendicular to the first axis A1 .
- the translational mobility of the nut 15 is illustrated in FIG. 1 by the double arrow referenced X.
- the nut 15 is tapped and is engaged by screwing with a threaded rod 16 extended along the fifth axis A5 and around which it is driven in rotation by a second motor M2.
- a contact sensor 17 intervenes, for example of the electromagnetic, optical or, more simply, electrical type.
- a control unit programmed for this purpose coordinates these operations and notably controls the second motor M2.
- the angular position of the lens 2 around the first axis A1 and the angular position of the link 12 around the second axis A2 are known at all times.
- the angular position of the link 12 corresponds, at all times, to the final position of the rocker 5, corrected for the angular difference between the link 12 and the rocker 5 when they are in contact.
- This angular position of the link 12 corresponds to a position linear of the nut 15 along the rod 16, called the final machining instruction.
- the machining of the lens 2 is it declared to be complete when the pressing of the rocker 5 against the link 12 has been detected on a complete revolution of the lens 2 around the first axis A1, the contour of the lens 2 now having reaches the desired shape of the circle of the aforementioned frame.
- This template 2 ' is a template such as those used in the template grinders of the prior art, mentioned in the preamble of this document.
- a template 2 ′ has a contour whose shape corresponds to that of one of the circles of a spectacle frame.
- this template 2 ' has two parallel planar faces and not convex and / or concave faces like the ophthalmic lens 2 to be produced.
- the rocker 5 is lowered until the template 2' comes into contact with the grinding wheel 6.
- This contact position is then identified using the link 12.
- the motor M2 is actuated in order to move the nut 15 on the threaded rod 16 until the contact 17 placed on the link 12 comes to meet the counter-stop 17 'provided on the rocker 5.
- the position corresponding to this contact is identified by an encoder 18 associated with the motor M2. This position is memorized in the control unit associated with the grinder.
- the nut 15 is then moved downwards (the up / down orientations are made here with reference to the drawing.
- the control unit of the grinder can calculate the outline of the template 2 '. The latter can then be removed from the axis A1 and an ophthalmic lens blank 2 comes to take its place.
- the machining of this blank to obtain the ophthalmic lens 2 is carried out in a conventional manner as is carried out by machining with a digital grinder.
- the data used for this grinding are the data calculated following the reading of the template 2 '.
- a probing of the front and rear faces of the blank placed on the axis A1 is carried out.
- the blank is then machined and optionally bevelled along a trajectory calculated from the data recorded during the reading phase of the template 2 '.
- This first machining operation provides for example the right lens of the corresponding spectacle frame.
- the machining and possibly beveling of the left glass is carried out.
- the method according to the invention allows the use of a digital grinder as a template reader. It is therefore no longer necessary to associate with such a grinder a specific reader which digitizes the shape of a spectacle frame circle. Thanks to the economy of the reader generally associated with a digital grinder, it is possible at a much lower cost, with a method according to the invention, to benefit from all the advantages of digital. Indeed, the control unit knowing the shape to be given to the blank to be machined can carry out all the machining operations to obtain a fully finished spectacle lens (with bevel, etc.).
- the method according to the invention can be implemented with a conventional digital grinder without modifying the latter.
- a grinder can also be adapted to the method according to the invention.
- a train of grinding wheels 6 instead of reading a template with the grinding wheel 6 which subsequently performs the machining of the blank, it is possible to equip a train of grinding wheels 6 with a disc 19 shown in dotted in FIG. 3.
- This disc is for example a smooth disc of geometry identical to that of a grinding wheel 6.
- This sensor is then advantageously a pressure sensor.
- Such a pressure sensor can of course also take place between the link 12 and the rocker 5 in addition to or in place of the sensor 17. In the case where two sensors are present, one of them (the pressure sensor by example) can be used for the phase concerning the reading of the template 2 'and the other (the sensor 17 for example) can be used during the machining of the blank.
- the frame is supplied without a template.
- frames known under the brand "NYLORS” or frames used with pierced lenses for which each lens is drilled on the one hand to receive a branch and on the other hand to be connected to the other glasses of glasses by a "nose".
- template in the present document therefore also relates to such presentation glasses.
- the present invention is not limited to the method described above by way of nonlimiting example and to the variants mentioned. It also relates to all the variants within the reach of the skilled person. in the context of the claims below.
- the present invention can be implemented with a grinder of a different type from that described and shown in the drawing. Reading the template can also be done differently.
- the link and the rocker at each increment of the template to read the relative position of the axis of the grinding wheels and the axis of the template
- the template is placed on its axis, in the place usually provided for receiving a blank to be machined.
- the wheel train is moved so that the tool for reading the shape of the template is facing it.
- the rocker is then moved so that the template comes into contact with the tool used for reading.
- the template is then rotated about its axis. This axis is carried by the rocker.
- the axes of the scale and the grinding wheel are fixed axes on the chassis of the grinder.
- the rocker will oscillate around its axis according to the variations of radius of the template.
- the rocker will oscillate around its axis according to the variations of radius of the template.
- the movable nut is placed in such a way on its threaded rod that the sensor placed on the link does not come into contact with the associated counter-stop so as not to hinder the movement of the rocker.
- the shape of the template can be read discreetly but also continuously.
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)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0302869A FR2851947B1 (fr) | 2003-03-07 | 2003-03-07 | Procede d'usinage d'une lentille ophtalmique. |
| FR0302869 | 2003-03-07 | ||
| PCT/FR2004/000531 WO2004080652A1 (fr) | 2003-03-07 | 2004-03-05 | Procede d’usinage d’une lentille ophtalmique et machine d’usinage pour mettre en oeuvre la methode precedente |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1601496A1 true EP1601496A1 (fr) | 2005-12-07 |
| EP1601496B1 EP1601496B1 (fr) | 2014-10-29 |
Family
ID=32865344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04717673.0A Expired - Lifetime EP1601496B1 (fr) | 2003-03-07 | 2004-03-05 | Procede d'usinage d'une lentille ophtalmique et machine d'usinage pour mettre en oeuvre la methode precedente |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1601496B1 (fr) |
| JP (1) | JP2006519706A (fr) |
| KR (1) | KR20050103971A (fr) |
| CN (1) | CN1758988A (fr) |
| FR (1) | FR2851947B1 (fr) |
| WO (1) | WO2004080652A1 (fr) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2878979B1 (fr) * | 2004-12-03 | 2007-04-20 | Essilor Int | Procede et dispositif de mesure de puissance d'une lentille ophtalmique par mesure optique globale sans contact et palpage combines |
| CN102463512B (zh) * | 2010-11-12 | 2013-09-11 | 深圳市蓝思达科技有限公司 | 双砂轮仿形机 |
| CN105073395B (zh) * | 2013-04-23 | 2017-09-26 | 埃西勒国际通用光学公司 | 用于对光学镜片制造工艺中所使用的制造设备进行控制的方法 |
| CN108188866A (zh) * | 2018-03-21 | 2018-06-22 | 望江县天长光学仪器有限公司 | 一种镜片抛光机 |
| JP7020711B2 (ja) * | 2020-05-07 | 2022-02-16 | 株式会社タクボ精機製作所 | 眼鏡レンズ形状データ取得方法及びレンズ加工装置 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1264556A (fr) * | 1985-05-08 | 1990-01-23 | Georges Zoueki | Support pour lentille et gabarit |
| ES2017183A6 (es) * | 1989-10-27 | 1991-01-01 | Indo Int Sa | Maquina biseladora para lentes. |
| FR2734505B1 (fr) * | 1995-05-24 | 1997-08-01 | Essilor Int | Gabarit de calibrage pour l'etalonnage d'une meuleuse pour lentille ophtalmique, et procede d'etalonnage correspondant |
-
2003
- 2003-03-07 FR FR0302869A patent/FR2851947B1/fr not_active Expired - Fee Related
-
2004
- 2004-03-05 CN CNA200480006277XA patent/CN1758988A/zh active Pending
- 2004-03-05 EP EP04717673.0A patent/EP1601496B1/fr not_active Expired - Lifetime
- 2004-03-05 WO PCT/FR2004/000531 patent/WO2004080652A1/fr not_active Ceased
- 2004-03-05 JP JP2006505700A patent/JP2006519706A/ja not_active Withdrawn
- 2004-03-05 KR KR1020057016201A patent/KR20050103971A/ko not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2004080652A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2851947A1 (fr) | 2004-09-10 |
| CN1758988A (zh) | 2006-04-12 |
| FR2851947B1 (fr) | 2006-09-22 |
| EP1601496B1 (fr) | 2014-10-29 |
| KR20050103971A (ko) | 2005-11-01 |
| JP2006519706A (ja) | 2006-08-31 |
| WO2004080652A1 (fr) | 2004-09-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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