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EP2760634B1 - Polishing apparatus for optical lenses - Google Patents

Polishing apparatus for optical lenses Download PDF

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Publication number
EP2760634B1
EP2760634B1 EP12775751.6A EP12775751A EP2760634B1 EP 2760634 B1 EP2760634 B1 EP 2760634B1 EP 12775751 A EP12775751 A EP 12775751A EP 2760634 B1 EP2760634 B1 EP 2760634B1
Authority
EP
European Patent Office
Prior art keywords
tool
lens
holder
axis
tool holder
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.)
Not-in-force
Application number
EP12775751.6A
Other languages
German (de)
French (fr)
Other versions
EP2760634A1 (en
Inventor
Guy Monnoyeur
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.)
Visioptimum International
Original Assignee
Visioptimum International
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 Visioptimum International filed Critical Visioptimum International
Publication of EP2760634A1 publication Critical patent/EP2760634A1/en
Application granted granted Critical
Publication of EP2760634B1 publication Critical patent/EP2760634B1/en
Not-in-force 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
    • B24B13/01—Specific tools, e.g. bowl-like; Production, dressing or fastening of these tools
    • B24B13/012—Specific tools, e.g. bowl-like; Production, dressing or fastening of these tools conformable in shape to the optical surface, e.g. by fluid pressure acting on an elastic membrane
    • 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
    • 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
    • B24B13/02—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor by means of tools with abrading surfaces corresponding in shape with the lenses to be made
    • 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
    • B24B49/16—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 taking regard of the load

Definitions

  • the invention relates to the field of lens polishing.
  • polishing In the manufacture of spectacle lenses, polishing is particularly important. It is a question of obtaining on the one hand a quality of finish sufficient to obtain an optical polish to have the transparency of the lens, or to remove defects of surface state during the preceding operation of machining called generation . On the other hand, it is a question of obtaining as precisely as possible the prescribed radii of curvature, so that the actual correction corresponds to the recommended correction, without deformation of the surface which has been generated.
  • the document US-2005/0221721 proposes a lens polishing device, wherein the polishing tool is mounted on a tool holder attached to the end of a shaft movable in rotation about its axis and movable in translation along its axis.
  • the tool holder is also rotatable about a vertical axis passing close to the tool holder.
  • the lens is held on a holding block attached to the end of a rotating shaft about its axis, and in translation along its axis.
  • This holding block is also movable in translation along a perpendicular horizontal axis. All these possibilities of movement allow any freedom of positioning of the tool relative to the lens.
  • the polishing is not sufficiently regular, the support force of the tool on the lens is not identical in all positions.
  • the present invention proposes to remedy at least some of the aforementioned drawbacks and proposes a solution that makes it possible to improve the regularity of the bearing pressure of the tool on the lens.
  • the present invention further relates to a method of polishing optical lenses using a polishing device according to the invention, wherein said tool describes a circular sinusoid-shaped path.
  • a complete revolution does not correspond to an integer number of periods of said trajectory, so that the points of contact between the tool and the lens are not identical between two consecutive turns.
  • said lens may comprise zones with different radii of curvature so as to allow use in progressive vision glasses, and the combination of the settings makes it possible to keep the tool always perpendicular to the area of the surface to be polished.
  • the advantage of the present invention lies in particular in that it allows polishing along paths ensuring regular polishing on the entire surface of the lens to be polished. It also allows adjustment of the pressure of the tool on the lens at any time, thus guaranteeing a better polishing quality.
  • a device 1 for polishing lenses comprises a tool 2, a tool holder 3 rotatable about its axis A, and movable in translation along said axis A.
  • the assembly is also movable in rotation about a substantially vertical axis V, which axis V passes close to the tool holder 3, so that the rotational movement about the axis V does not produce significant displacement of the tool, but only its rotation.
  • the device 1 further comprises a lens holder 4 adapted to hold a lens 5, and fixed at the end of a shaft 6 mobile in rotation about its axis Z, and movable in translation along said axis Z.
  • the assembly door lens, and its shaft are also movable in translation along an axis X perpendicular to the axis Z in the horizontal plane, so that the lens holder can move towards or away from the tool, but also move laterally relative to the tool.
  • the present invention relates to a device 1 for polishing lenses.
  • the lens 5 is disposed on a lens holder 4 attached to the end of a shaft 6, rotatable about its axis Z.
  • a motor 7 is mechanically connected to the shaft 6 and able to rotate it.
  • a translation device 8 makes it possible to impart a horizontal translational movement to the lens holder assembly 4 and shaft 6, so that the lens 5 can be moved horizontally while rotating it about the Z axis.
  • the tool holder assembly can be moved instead of moving the lens.
  • a tool 2 is fixed on a tool holder 3.
  • This tool holder comprises a tool support body 16 in which is formed a space 23 may include a gas, for example air.
  • a elastic membrane 17, for example flat, is fixed on the one hand to the tool support body by a locking ring 18, on the other hand to the tool holder 19. This is therefore movable relative to the tool support body, so that the pressure exerted on the tool support by the polishing operation results in a reduction of the volume inside the tool support body, and therefore an increase in the pressure.
  • a pressure detector 20 makes it possible to measure this pressure variation and to transmit the information to a data processing means such as a PLC or a computer, which then controls a movement of the tool holder towards the lens, if the pressure has decreased, or a movement away from the lens if the pressure has increased.
  • a data processing means such as a PLC or a computer
  • the elastic membrane 17 also makes it possible to transmit the rotational torque of the tool support body 16 to the tool support 19.
  • a connecting piece 21 is clipped onto the tool support.
  • This piece is for example plastic.
  • a foam pad 22 is glued to the connecting piece 21, and the tool 2 is glued to the pad 22.
  • This tool 2 may take the form of an abrasive polishing sheet.
  • the pad is deformable, which allows automatic orientation of the polishing sheet tangent to the lens.
  • the elastic membrane enhances the flexibility of the tool.
  • the tool carrier is attached to an articulated shaft 9 movable in rotation about its axis, and attached to a support shaft 10, which is here an upper shaft 10, via a ball 11.
  • the upper shaft 10 is driven in rotation about its axis by a motor 12, a belt 13, or a chain ensuring the mechanical connection between said motor 12 and the upper shaft 10.
  • the ball 11 allows the articulated shaft 9 to take an inclination relative to vertically noted ⁇ in the remainder of this description, while transmitting the rotational movement of the upper shaft to the articulated shaft 9, so that the articulated shaft 9 is rotated about its axis.
  • the inclination ⁇ of the articulated shaft 9 is controlled by a device 14 for horizontal displacement of a point of the articulated shaft 9. Any other device for controlling the inclination could also be suitable.
  • a box 15 is rotatable about a substantially vertical axis, and drives the device 14 of horizontal displacement in a path of rotation about the axis of the upper shaft 10.
  • the articulated shaft 9 can therefore rotate not only around its axis, but also around the vertical axis of the upper shaft 10, so that the tool holder, while turning on itself describes a path around the vertical, which can be circular if the device 14 for horizontal movement keeps the articulated shaft in a fixed position relative to the vertical, but which can also describe a circular sinusoid, if the device 14 describes a reciprocating movement during the rotation of the box 15 .
  • the upper shaft 10 is referred to herein as "upper”, and is actually located above the articulated shaft 9 in the embodiment of Fig. 2 . But it could also be located next to or below the articulated shaft 9. For the purposes of this patent application, it will nevertheless be called “upper tree”, although it may be lower.
  • the Fig. 4 to 6 illustrate such a movement, with the tool describing a circle on this trajectory.
  • the Fig. 5 indicates the variation of the angle ⁇ as a function of the rotation angle ⁇ over a whole turn (360 °) around the vertical axis.
  • the Fig. 6 indicates the variation of the distance d of the device 14 with respect to the axis of the upper shaft as a function of the rotation angle ⁇ over a whole turn (360 °) around the vertical axis.
  • These two curves are of the sinusoidal type in the sense that the curve passes above and below the abscissa axis periodically.
  • the Fig. 4 illustrates the trajectory obtained on the lens, of circular sinusoid type, in the sense that the trajectory passes outside and inside a circle, periodically.
  • the tool holder turns on itself while describing this trajectory. There will be a phase shift between the back and forth movement of the device 14, and the rotation about the vertical axis, producing a difference in trajectory after each turn.
  • the tool finds the same point of the lens after three turns.
  • the lens is not circular but oval.
  • the trajectory obtained is adapted to this oval shape. This can for example be achieved through a coordinated horizontal movement of the lens.
  • the shape of the lens may be any, the oval shape being only one example of possible shape.
  • the shaft 6 can be subdivided into a vertical lower support shaft, and an articulated shaft, connected to the support shaft by a ball joint, in a manner similar to the construction of the Articulated shaft for the tool holder.
  • Such an arrangement can facilitate the polishing of convex glasses by reducing the vertical movements of adaptation of the tool holder which must always be precisely on the surface of the lens.
  • only the shaft supporting the lens holder is made of a vertical shaft and an articulated shaft, and the shaft supporting the tool holder is devoid of such a ball joint.
  • Such a provision is not outside the scope of the invention.
  • the term "vertical” is used here for the simplicity of the description, but a provision where said tree is inclined or even horizontal is not beyond the scope of the present invention.
  • the fact of off-centering the tool on a path around the axis of rotation of the upper shaft prevents the accumulation of polishing dust, which are always driven from one side or the other .
  • the tool is always in direct contact with the lens, and performs a optimized polishing. Indeed the accumulation of dust between the tool and the lens would reduce the quality of polishing, and can cause scratches on the lens.
  • the advantage of the present invention lies in particular in that it allows polishing along paths ensuring regular polishing on the entire surface of the lens to be polished. It also allows the pressure of the tool to be adjusted to the lens at any time, thus ensuring better polishing quality, especially for soft materials such as plastics.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Description

L'invention concerne le domaine du polissage de lentilles.The invention relates to the field of lens polishing.

Elle concerne plus particulièrement un dispositif amélioré de polissage de lentilles (voir par exemple EP-A-0043233 ). Dans la fabrication de verres de lunettes, le polissage est particulièrement important. Il s'agit d'obtenir d'une part une qualité de finition suffisante pour obtenir un poli optique pour avoir la transparence de la lentille, ou pour supprimer des défauts d'état de surface lors de l'opération précédente d'usinage appelée génération. Il s'agit d'autre part d'obtenir le plus précisément possible les rayons de courbure prescrits, de sorte que la correction effective corresponde à la correction préconisée, sans déformation de la surface qui a été générée.It relates more particularly to an improved device for polishing lenses (see for example EP-A-0043233 ). In the manufacture of spectacle lenses, polishing is particularly important. It is a question of obtaining on the one hand a quality of finish sufficient to obtain an optical polish to have the transparency of the lens, or to remove defects of surface state during the preceding operation of machining called generation . On the other hand, it is a question of obtaining as precisely as possible the prescribed radii of curvature, so that the actual correction corresponds to the recommended correction, without deformation of the surface which has been generated.

Un système actuel consiste à reposer la lentille sur une surface déformable (mousse) et à faire évoluer l'outil sur la surface à polir tout en faisant tourner la lentille sur elle-même. Il en découle une déformation du support de la lentille selon la forme de la lentille elle-même ce qui signifie que selon l'endroit où l'on se trouve, l'outil va plus ou moins appuyer sur la lentille et donc la fonction de polissage sera distincte d'un point à l'autre d'où une déformation.One current system is to rest the lens on a deformable surface (foam) and to evolve the tool on the surface to be polished while rotating the lens on itself. This results in a deformation of the support of the lens according to the shape of the lens itself, which means that depending on where you are, the tool will more or less press the lens and therefore the function of polishing will be distinct from one point to another hence a deformation.

Le document US-2005/0221721 propose un dispositif de polissage de lentilles, dans lequel l'outil de polissage est monté sur un porte-outil fixé au bout d'un arbre mobile en rotation autour de son axe et mobile en translation le long de son axe. Le porte-outil est en outre mobile en rotation autour d'un axe vertical passant proche du porte-outil. De son côté, la lentille est tenue sur un bloc de maintien fixé au bout d'un arbre mobile en rotation autour de son axe, et en translation le long de son axe. Ce bloc de maintien est en outre mobile en translation le long d'un axe horizontal perpendiculaire. Toutes ces possibilités de mouvements permettent toute liberté de positionnement de l'outil par rapport à la lentille.The document US-2005/0221721 proposes a lens polishing device, wherein the polishing tool is mounted on a tool holder attached to the end of a shaft movable in rotation about its axis and movable in translation along its axis. The tool holder is also rotatable about a vertical axis passing close to the tool holder. For its part, the lens is held on a holding block attached to the end of a rotating shaft about its axis, and in translation along its axis. This holding block is also movable in translation along a perpendicular horizontal axis. All these possibilities of movement allow any freedom of positioning of the tool relative to the lens.

Néanmoins le polissage n'est pas suffisamment régulier, la force d'appui de l'outil sur la lentille n'étant pas identique dans toutes les positions.However, the polishing is not sufficiently regular, the support force of the tool on the lens is not identical in all positions.

La présente invention se propose de remédier à au moins une partie des inconvénients précités et propose une solution qui permette d'améliorer la régularité de la pression d'appui de l'outil sur la lentille.The present invention proposes to remedy at least some of the aforementioned drawbacks and proposes a solution that makes it possible to improve the regularity of the bearing pressure of the tool on the lens.

A cet effet, l'invention concerne un dispositif de polissage de lentilles optiques, selon la revendication 1. Selon d'autres caractéristiques :

  • ledit dispositif peut comporter une rotule disposée entre un arbre articulé solidaire du porte-outil et les moyens de positionnement dudit porte-outil, de sorte à permettre un déplacement sphérique dudit outil, sur une sphère dont le rayon est de l'ordre de la longueur dudit arbre articulé,
  • ledit dispositif peut comporter en outre une rotule disposée entre un arbre articulé solidaire du porte-lentille et les moyens de positionnement dudit porte-lentille, de sorte à permettre un déplacement sphérique de ladite lentille, sur une sphère dont le rayon est de l'ordre de la longueur dudit arbre articulé,
  • lesdits moyens de positionnement du porte outil, respectivement du porte-lentilles, peuvent comporter un arbre support mobile en rotation autour de son axe, ledit arbre support comportant en son extrémité ladite rotule, et un caisson excentrique solidaire de l'arbre support, ledit caisson excentrique comportant un moyen de guidage de l'axe articulé ; une telle disposition permet un guidage particulièrement fiable de l'axe articulé,
  • ledit moyen de guidage peut être configuré apte à effectuer un mouvement de va et vient entre une position proche de l'axe de rotation de l'arbre support et une position éloignée dudit axe, permettant ainsi la réalisation de trajectoires circulaires sinusoïdales,
  • ledit outil peut être fixé sur ledit porte-outil par l'intermédiaire d'un moyen élastique,
  • ledit dispositif peut comporter un support outil fixé sur ledit porte-outil par l'intermédiaire dudit moyen élastique, et ledit outil est fixé sur ledit support outil par l'intermédiaire d'une pièce déformable, permettant ainsi d'ajouter à la souplesse connue due à la pièce déformable, une souplesse supplémentaire due au moyen élastique,
  • ledit moyen élastique peut être une membrane élastique ; cette membrane peut être plate ou présenter une autre forme,
  • ledit porte-outil peut comprendre un espace étanche contenant du gaz adjacent audit moyen élastique, de sorte qu'un effort appliqué sur ledit moyen élastique produit une variation du volume dudit espace, permettant ainsi de mesurer ledit effort, par exemple par une mesure de la pression dudit gaz.
For this purpose, the invention relates to a device for polishing optical lenses, according to claim 1. According to other characteristics:
  • said device may comprise a ball joint disposed between an articulated shaft integral with the tool holder and the positioning means of said tool holder, so as to allow a spherical displacement of said tool, on a sphere whose radius is of the order of length said articulated shaft,
  • said device may further comprise a ball joint disposed between an articulated shaft integral with the lens holder and the positioning means of said lens holder, so as to allow a spherical displacement of said lens, on a sphere whose radius is of the order the length of said articulated shaft,
  • said means for positioning the tool holder, respectively the lens holder, may comprise a support shaft movable in rotation about its axis, said support shaft having at its end said ball joint, and an eccentric box integral with the support shaft, said box eccentric comprising a guide means of the articulated axis; such an arrangement allows particularly reliable guidance of the articulated axis,
  • said guide means may be configured able to move back and forth between a position close to the axis of rotation of the support shaft and a position remote from said axis, thus allowing the realization of sinusoidal circular paths,
  • said tool can be fixed on said tool holder by means of an elastic means,
  • said device may comprise a tool support fixed on said tool holder by means of said elastic means, and said tool is fixed on said tool support by means of a deformable part, thus making it possible to add to the known flexibility due to to the deformable part, an additional flexibility due to the elastic means,
  • said elastic means may be an elastic membrane; this membrane may be flat or have another shape,
  • said tool holder may comprise a sealed space containing gas adjacent to said elastic means, so that a force applied on said elastic means produces a variation in the volume of said space, thus making it possible to measure said force, for example by a measurement of the pressure of said gas.

La présente invention concerne encore un procédé de polissage de lentilles optiques en utilisant un dispositif de polissage selon l'invention, dans lequel ledit outil décrit une trajectoire en forme de sinusoïde circulaire.The present invention further relates to a method of polishing optical lenses using a polishing device according to the invention, wherein said tool describes a circular sinusoid-shaped path.

Selon un mode avantageux de réalisation de l'invention, un tour complet ne correspond pas à un nombre entier de périodes de ladite trajectoire, de sorte que les points de contact entre l'outil et la lentille ne sont pas identiques entre deux tours consécutifs.According to an advantageous embodiment of the invention, a complete revolution does not correspond to an integer number of periods of said trajectory, so that the points of contact between the tool and the lens are not identical between two consecutive turns.

Selon un autre mode avantageux de réalisation de l'invention, ladite lentille peut comprendre des zones avec des rayons de courbure différents de sorte à permettre une utilisation en verres à vision progressive, et la combinaison des réglages permet de garder l'outil toujours perpendiculaire à la zone de la surface à polir.According to another advantageous embodiment of the invention, said lens may comprise zones with different radii of curvature so as to allow use in progressive vision glasses, and the combination of the settings makes it possible to keep the tool always perpendicular to the area of the surface to be polished.

L'avantage découlant de la présente invention réside en particulier en ce qu'elle permet un polissage selon des trajectoires assurant un polissage régulier sur toute la surface de la lentille à polir. Elle permet en outre un réglage à tout instant de la pression de l'outil sur la lentille, garantissant ainsi une meilleure qualité du polissage.The advantage of the present invention lies in particular in that it allows polishing along paths ensuring regular polishing on the entire surface of the lens to be polished. It also allows adjustment of the pressure of the tool on the lens at any time, thus guaranteeing a better polishing quality.

D'autres caractéristiques et avantages de l'invention ressortiront de la description détaillée qui va suivre se rapportant à un exemple de réalisation donné à titre indicatif et non limitatif.Other features and advantages of the invention will emerge from the following detailed description relating to an exemplary embodiment given by way of indication and not limitation.

La compréhension de cette description sera facilitée en se référant aux dessins joints, dans lesquels :

  • la figure 1 représente une vue schématique en perspective d'un dispositif selon l'état de la technique ;
  • la figure 2 représente une vue schématique fonctionnelle d'un dispositif selon l'invention ;
  • la figure 3 représente une vue en coupe d'un porte outil du dispositif de la fig. 1 ;
  • la figure 4 représente un graphique illustrant un exemple de trajectoire de l'outil sur la lentille ;
  • les figures 5 et 6 représentent deux graphiques illustrant un exemple d'inclinaison du porte-outil autour de sa rotule, respectivement de déplacement correspondant de l'arbre articulé ;
The understanding of this description will be facilitated with reference to the accompanying drawings, in which:
  • the figure 1 is a schematic perspective view of a device according to the state of the art;
  • the figure 2 represents a functional schematic view of a device according to the invention;
  • the figure 3 represents a sectional view of a tool carrier of the device of the Fig. 1 ;
  • the figure 4 represents a graph illustrating an example of trajectory of the tool on the lens;
  • the Figures 5 and 6 represent two graphs illustrating an example of inclination of the tool holder around its ball joint, respectively corresponding displacement of the articulated shaft;

Comme visible à la fig. 1, un dispositif 1 de polissage de lentilles, selon l'état de la technique, comprend un outil 2, un porte-outil 3 mobile en rotation autour de son axe A, et mobile en translation le long dudit axe A. L'ensemble est également mobile en rotation autour d'un axe sensiblement vertical V, lequel axe V passe proche du porte outil 3, de sorte que le mouvement de rotation autour de l'axe V ne produit pas de déplacement significatif de l'outil, mais seulement sa rotation. Le dispositif 1 comprend en outre un porte-lentille 4 apte à maintenir une lentille 5, et fixé au bout d'un arbre 6 mobile en rotation autour de son axe Z, et mobile en translation le long dudit axe Z. L'ensemble porte-lentille, et son arbre sont également mobiles en translation le long d'un axe X perpendiculaire à l'axe Z dans le plan horizontal, de sorte que le porte-lentille peut se déplacer vers l'outil ou s'en éloigner, mais également se déplacer latéralement par rapport à l'outil.As visible at Fig. 1 , a device 1 for polishing lenses, according to the state of the art, comprises a tool 2, a tool holder 3 rotatable about its axis A, and movable in translation along said axis A. The assembly is also movable in rotation about a substantially vertical axis V, which axis V passes close to the tool holder 3, so that the rotational movement about the axis V does not produce significant displacement of the tool, but only its rotation. The device 1 further comprises a lens holder 4 adapted to hold a lens 5, and fixed at the end of a shaft 6 mobile in rotation about its axis Z, and movable in translation along said axis Z. The assembly door lens, and its shaft are also movable in translation along an axis X perpendicular to the axis Z in the horizontal plane, so that the lens holder can move towards or away from the tool, but also move laterally relative to the tool.

Tel que représenté dans les figures 2 à 4 du dessin ci-joint, la présente invention concerne un dispositif 1 de polissage de lentilles. La lentille 5 est disposée sur un porte-lentille 4 attaché à l'extrémité d'un arbre 6, mobile en rotation autour de son axe Z. Un moteur 7 est relié mécaniquement à l'arbre 6 et apte à le faire tourner. Un dispositif de translation 8 permet de conférer un mouvement de translation horizontal à l'ensemble porte-lentille 4 et arbre 6, de sorte qu'on peut déplacer horizontalement la lentille 5 tout en la faisant tourner autour de l'axe Z. Selon un autre mode de réalisation, on peut déplacer l'ensemble porte-outil au lieu de déplacer la lentille.As shown in the Figures 2 to 4 of the accompanying drawing, the present invention relates to a device 1 for polishing lenses. The lens 5 is disposed on a lens holder 4 attached to the end of a shaft 6, rotatable about its axis Z. A motor 7 is mechanically connected to the shaft 6 and able to rotate it. A translation device 8 makes it possible to impart a horizontal translational movement to the lens holder assembly 4 and shaft 6, so that the lens 5 can be moved horizontally while rotating it about the Z axis. In another embodiment, the tool holder assembly can be moved instead of moving the lens.

Un outil 2 est fixé sur un porte outil 3. Ce porte outil comporte un corps support outil 16 dans lequel est ménagé un espace 23 pouvant comporter un gaz, par exemple de l'air. Une membrane élastique 17, par exemple plate, est fixée d'une part au corps support outil par une bague de blocage 18, d'autre part au support outil 19. Celui-ci est donc mobile par rapport au corps support outil, de sorte que la pression exercée sur le support outil par l'opération de polissage se traduit par une réduction du volume à l'intérieur du corps support outil, et donc une augmentation de la pression. Un détecteur de pression 20 permet de mesurer cette variation de pression et en transmettre l'information à un moyen de traitement de données tel qu'un automate ou un ordinateur, lequel commande alors un mouvement du porte-outil vers la lentille, si la pression a diminué, ou un mouvement d'éloignement par rapport à la lentille si la pression a augmenté.A tool 2 is fixed on a tool holder 3. This tool holder comprises a tool support body 16 in which is formed a space 23 may include a gas, for example air. A elastic membrane 17, for example flat, is fixed on the one hand to the tool support body by a locking ring 18, on the other hand to the tool holder 19. This is therefore movable relative to the tool support body, so that the pressure exerted on the tool support by the polishing operation results in a reduction of the volume inside the tool support body, and therefore an increase in the pressure. A pressure detector 20 makes it possible to measure this pressure variation and to transmit the information to a data processing means such as a PLC or a computer, which then controls a movement of the tool holder towards the lens, if the pressure has decreased, or a movement away from the lens if the pressure has increased.

La membrane élastique 17 permet par ailleurs de transmettre le couple de rotation du corps support outil 16 au support outil 19.The elastic membrane 17 also makes it possible to transmit the rotational torque of the tool support body 16 to the tool support 19.

Une pièce de raccordement 21 est clipsée sur le support outil. Cette pièce est par exemple en matière plastique. Un tampon 22 en mousse est collé sur la pièce de raccordement 21, et l'outil 2 est collé sur le tampon 22. Cet outil 2 peut prendre la forme d'une feuille abrasive de polissage. Le tampon est déformable, ce qui permet une orientation automatique de la feuille de polissage tangente à la lentille. La membrane élastique accentue la flexibilité de l'outil.A connecting piece 21 is clipped onto the tool support. This piece is for example plastic. A foam pad 22 is glued to the connecting piece 21, and the tool 2 is glued to the pad 22. This tool 2 may take the form of an abrasive polishing sheet. The pad is deformable, which allows automatic orientation of the polishing sheet tangent to the lens. The elastic membrane enhances the flexibility of the tool.

Le porte outil est attaché à un arbre articulé 9 mobile en rotation autour de son axe, et attaché à un arbre support 10, qui est ici un arbre supérieur 10, par l'intermédiaire d'une rotule 11. L'arbre supérieur 10 est entraîné en rotation autour de son axe par un moteur 12, une courroie 13, ou une chaine assurant le lien mécanique entre ledit moteur 12 et l'arbre supérieur 10. La rotule 11 permet à l'arbre articulé 9 de prendre une inclinaison par rapport à la verticale notée α dans la suite de cette description, tout en transmettant le mouvement de rotation de l'arbre supérieur à l'arbre articulé 9, de sorte que l'arbre articulé 9 est entraîné en rotation autour de son axe. L'inclinaison α de l'arbre articulé 9 est commandée par un dispositif 14 de déplacement horizontal d'un point de l'arbre articulé 9. Tout autre dispositif de commande de l'inclinaison pourrait convenir également. De manière préférentielle, un caisson 15 est mobile en rotation autour d'un axe sensiblement vertical, et entraîne le dispositif 14 de déplacement horizontal dans une trajectoire de rotation autour de l'axe de l'arbre supérieur 10. L'arbre articulé 9 peut donc tourner non seulement autour de son axe, mais également autour de l'axe vertical de l'arbre supérieur 10, de sorte que le porte-outil, tout en tournant sur lui-même décrit une trajectoire autour de la verticale, qui peut être circulaire si le dispositif 14 de déplacement horizontal maintient l'arbre articulé en position fixe par rapport à la verticale, mais qui peut aussi décrire une sinusoïde circulaire, si le dispositif 14 décrit un mouvement de va-et-vient pendant la rotation du caisson 15.The tool carrier is attached to an articulated shaft 9 movable in rotation about its axis, and attached to a support shaft 10, which is here an upper shaft 10, via a ball 11. The upper shaft 10 is driven in rotation about its axis by a motor 12, a belt 13, or a chain ensuring the mechanical connection between said motor 12 and the upper shaft 10. The ball 11 allows the articulated shaft 9 to take an inclination relative to vertically noted α in the remainder of this description, while transmitting the rotational movement of the upper shaft to the articulated shaft 9, so that the articulated shaft 9 is rotated about its axis. The inclination α of the articulated shaft 9 is controlled by a device 14 for horizontal displacement of a point of the articulated shaft 9. Any other device for controlling the inclination could also be suitable. Preferably, a box 15 is rotatable about a substantially vertical axis, and drives the device 14 of horizontal displacement in a path of rotation about the axis of the upper shaft 10. The articulated shaft 9 can therefore rotate not only around its axis, but also around the vertical axis of the upper shaft 10, so that the tool holder, while turning on itself describes a path around the vertical, which can be circular if the device 14 for horizontal movement keeps the articulated shaft in a fixed position relative to the vertical, but which can also describe a circular sinusoid, if the device 14 describes a reciprocating movement during the rotation of the box 15 .

L'arbre supérieur 10 est désigné ici comme « supérieur », et il est effectivement situé au-dessus de l'arbre articulé 9 dans le mode de réalisation de fig. 2. Mais il pourrait aussi être situé à côté, ou en dessous de l'arbre articulé 9. Pour les besoins de la présente demande de brevet, il sera néanmoins appelé « arbre supérieur », même s'il peut se trouver plus bas.The upper shaft 10 is referred to herein as "upper", and is actually located above the articulated shaft 9 in the embodiment of Fig. 2 . But it could also be located next to or below the articulated shaft 9. For the purposes of this patent application, it will nevertheless be called "upper tree", although it may be lower.

Les fig. 4 à 6 illustrent un tel mouvement, avec l'outil décrivant un cercle sur cette trajectoire. La fig. 5 indique la variation de l'angle α en fonction de l'angle de rotation θ sur l'ensemble d'un tour (360°) autour de l'axe vertical. La fig. 6 indique la variation de la distance d du dispositif 14 par rapport à l'axe de l'arbre supérieur en fonction de l'angle de rotation θ sur l'ensemble d'un tour (360°) autour de l'axe vertical. Ces deux courbes sont du type sinusoïde dans le sens que la courbe passe au-dessus et en-dessous de l'axe des abscisses de façon périodique. La fig. 4 illustre la trajectoire obtenue sur la lentille, de type sinusoïde circulaire, dans le sens que la trajectoire passe à l'extérieur et à l'intérieur d'un cercle, de façon périodique. Le porte-outil tourne sur lui-même tout en décrivant cette trajectoire. On remarquera un décalage de phase entre le mouvement de va-et-vient du dispositif 14, et la rotation autour de l'axe vertical, produisant une différence de trajectoire après chaque tour. Dans l'exemple représenté, l'outil retrouve le même point de la lentille après trois tours. On remarquera aussi, dans l'exemple représenté que la lentille n'est pas circulaire mais ovale. La trajectoire obtenue est adaptée à cette forme ovale. Ceci peut par exemple être obtenu grâce à un mouvement horizontal coordonné de la lentille. Il est à noter que la forme de la lentille peut être quelconque, la forme ovale n'étant qu'un exemple parmi d'autres de forme possible.The Fig. 4 to 6 illustrate such a movement, with the tool describing a circle on this trajectory. The Fig. 5 indicates the variation of the angle α as a function of the rotation angle θ over a whole turn (360 °) around the vertical axis. The Fig. 6 indicates the variation of the distance d of the device 14 with respect to the axis of the upper shaft as a function of the rotation angle θ over a whole turn (360 °) around the vertical axis. These two curves are of the sinusoidal type in the sense that the curve passes above and below the abscissa axis periodically. The Fig. 4 illustrates the trajectory obtained on the lens, of circular sinusoid type, in the sense that the trajectory passes outside and inside a circle, periodically. The tool holder turns on itself while describing this trajectory. There will be a phase shift between the back and forth movement of the device 14, and the rotation about the vertical axis, producing a difference in trajectory after each turn. In the example shown, the tool finds the same point of the lens after three turns. It will also be noted, in the example shown that the lens is not circular but oval. The trajectory obtained is adapted to this oval shape. This can for example be achieved through a coordinated horizontal movement of the lens. It should be noted that the shape of the lens may be any, the oval shape being only one example of possible shape.

Selon un autre mode de réalisation de l'invention, l'arbre 6 peut se subdiviser en un arbre support inférieur vertical, et un arbre articulé, relié à l'arbre support par une rotule, d'une manière similaire à la construction de l'arbre articulé pour le porte outil. Une telle disposition peut faciliter le polissage de verres convexes en réduisant les mouvements verticaux d'adaptation du porte-outil qui doit toujours se situer précisément à la surface de la lentille.According to another embodiment of the invention, the shaft 6 can be subdivided into a vertical lower support shaft, and an articulated shaft, connected to the support shaft by a ball joint, in a manner similar to the construction of the Articulated shaft for the tool holder. Such an arrangement can facilitate the polishing of convex glasses by reducing the vertical movements of adaptation of the tool holder which must always be precisely on the surface of the lens.

Selon encore un autre mode de réalisation, seule l'arbre supportant le porte-lentille est réalisé en un arbre vertical et un arbre articulé, et l'arbre supportant le porte-outil est dépourvu d'une telle rotule. Une telle disposition ne sort pas du cadre de l'invention. Le terme « vertical » est ici utilisé pour la simplicité de la description, mais une disposition où ledit arbre serait incliné ou même horizontal ne sort pas du cadre de la présente invention.According to yet another embodiment, only the shaft supporting the lens holder is made of a vertical shaft and an articulated shaft, and the shaft supporting the tool holder is devoid of such a ball joint. Such a provision is not outside the scope of the invention. The term "vertical" is used here for the simplicity of the description, but a provision where said tree is inclined or even horizontal is not beyond the scope of the present invention.

Du fait de la ou des deux rotules, on combine plusieurs mouvements et du fait de la combinaison de l'ensemble de ces mouvements, il y a croissance du croisement des traits de polissage d'où une uniformisation du polissage et non déformation de la lentille.Because of the one or both patellae, several movements are combined and because of the combination of all these movements, there is a growth in the crossing of the polishing lines, hence a uniformization of the polishing and non-deformation of the lens. .

En outre le fait d'excentrer l'outil sur une trajectoire autour de l'axe de rotation de l'arbre supérieur permet d'éviter l'accumulation des poussières de polissage, lesquelles sont toujours chassées d'un côté ou de l'autre. Ainsi l'outil est toujours en contact direct avec la lentille, et effectue un polissage optimisé. En effet l'accumulation de poussière entre l'outil et la lentille réduirait la qualité de polissage, et peut provoquer des rayures sur la lentille.In addition, the fact of off-centering the tool on a path around the axis of rotation of the upper shaft prevents the accumulation of polishing dust, which are always driven from one side or the other . Thus the tool is always in direct contact with the lens, and performs a optimized polishing. Indeed the accumulation of dust between the tool and the lens would reduce the quality of polishing, and can cause scratches on the lens.

L'avantage de la présente invention réside en particulier en ce qu'elle permet un polissage selon des trajectoires assurant un polissage régulier sur toute la surface de la lentille à polir. Elle permet en outre un réglage à tout instant de la pression de l'outil sur la lentille, garantissant ainsi une meilleure qualité du polissage, surtout pour des matériaux tendres comme les « plastics ».The advantage of the present invention lies in particular in that it allows polishing along paths ensuring regular polishing on the entire surface of the lens to be polished. It also allows the pressure of the tool to be adjusted to the lens at any time, thus ensuring better polishing quality, especially for soft materials such as plastics.

Claims (13)

  1. Device (1) for polishing optical lenses, comprising a lens holder (4), means for positioning said lens holder (4) and means for causing said lens holder (4) to rotate about an axis, comprising in addition a polishing tool (2), a tool holder (3), means for positioning said tool holder (3) and means for causing said tool holder (3) to rotate about an axis, the device comprising in addition a ball joint (11) arranged between a shaft (9) integral with the tool holder (3) and the means for positioning said tool holder (3), or between a shaft integral with the lens holder (4) and the means for positioning said lens holder (4), so as to permit a spherical displacement of said tool (2) or said lens (5), respectively, characterized in the fact that the tool holder (3) is provided with means (20) for detecting the pressure exerted by the tool (2) on the lens (5), and a control loop between the detecting means (20) and the positioning means, so as to enable a control of said pressure on all the defined areas of the lens.
  2. Device (1) according to the preceding claim, including a ball joint arranged between a shaft (9) integral with the tool holder (3) and the means for positioning said tool holder (3).
  3. Device (1) according to the preceding claim, including a ball joint arranged between a shaft integral with the lens holder (4) and said means for positioning the lens holder (4) so as to enable a spherical movement of said lens (5).
  4. Device according to one of the preceding claims, wherein said means for positioning the tool holder or the lens holder, respectively, include a supporting shaft (10) movable in rotation about its axis, said supporting shaft (10) including at its end said ball joint (11), and an eccentric casing (15) integral with the supporting shaft (10), said eccentric casing (15) including means for guiding (14) the hinged axis.
  5. Device according to the preceding claim, wherein said guiding means is configured capable of performing a reciprocating motion between a position close to the axis of rotation of the supporting shaft (10) and a position away from said axis.
  6. Device (1) according to one of the preceding claims, wherein said tool (2) is fixed to said tool holder (3) through elastic means (17).
  7. Device (1) according to the preceding claim, wherein said elastic means is designed capable of driving said tool in rotation.
  8. Device (1) according to one of claims 6 or 7, including a tool support (19) fixed to said tool holder through said elastic means (17), and said tool is secured to said tool support (19) through a deformable part (22).
  9. Device (1) according to one of claims 6 or 8, wherein said elastic means is an elastic membrane (17), preferably a flat membrane.
  10. Device (1) according to one of claims 5 to 8, wherein said tool holder (3) comprises a tight space (23), containing gas, adjacent to said elastic means (17), so that a force applied on said elastic means (17) produces a change in volume of said space (23).
  11. Method for polishing optical lenses using a polishing device (1) according to one of the preceding claims, wherein said tool (2) describes a path having a circular sinusoidal shape.
  12. Method according to the preceding claim, wherein a full turn does not correspond to an integer number of periods of said path, so that the contact points between the tool (2) and the lens (5) are not identical between two consecutive turns.
  13. Method according to one of the preceding claims, wherein said lens (5) includes areas with different radii of curvature, so as to permit a usage as progressive vision lenses, and the combination of adjustments permits to keep the tool (2) always perpendicular to the area of the surface to be polished.
EP12775751.6A 2011-09-27 2012-09-21 Polishing apparatus for optical lenses Not-in-force EP2760634B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1158600A FR2980386B1 (en) 2011-09-27 2011-09-27 DEVICE FOR POLISHING OPTICAL LENSES
PCT/FR2012/052108 WO2013045795A1 (en) 2011-09-27 2012-09-21 Device for polishing optical lenses

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EP2760634A1 EP2760634A1 (en) 2014-08-06
EP2760634B1 true EP2760634B1 (en) 2017-12-27

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EP (1) EP2760634B1 (en)
CN (1) CN104105572B (en)
BR (1) BR112014007333A2 (en)
FR (1) FR2980386B1 (en)
HK (1) HK1202095A1 (en)
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WO (1) WO2013045795A1 (en)

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CN104105572B (en) 2017-10-27
HK1202095A1 (en) 2015-09-18
FR2980386B1 (en) 2014-09-12
US20140235142A1 (en) 2014-08-21
BR112014007333A2 (en) 2017-04-04
CN104105572A (en) 2014-10-15
US9764441B2 (en) 2017-09-19
WO2013045795A1 (en) 2013-04-04
FR2980386A1 (en) 2013-03-29
EP2760634A1 (en) 2014-08-06
IN2014DN03156A (en) 2015-05-22

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