EP2337652B1 - Optical-grade surfacing tool - Google Patents

Optical-grade surfacing tool Download PDF

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Publication number
EP2337652B1
EP2337652B1 EP09741349A EP09741349A EP2337652B1 EP 2337652 B1 EP2337652 B1 EP 2337652B1 EP 09741349 A EP09741349 A EP 09741349A EP 09741349 A EP09741349 A EP 09741349A EP 2337652 B1 EP2337652 B1 EP 2337652B1
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EP
European Patent Office
Prior art keywords
end surface
interface
rigid support
tool according
straps
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP09741349A
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German (de)
French (fr)
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EP2337652A1 (en
Inventor
Mathieu Meynen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EssilorLuxottica SA
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Essilor International Compagnie Generale dOptique SA
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Publication of EP2337652A1 publication Critical patent/EP2337652A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D9/00—Wheels or drums supporting in exchangeable arrangement a layer of flexible abrasive material, e.g. sandpaper
    • B24D9/08—Circular back-plates for carrying flexible material
    • 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
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
    • B24D13/14—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by the front face
    • B24D13/147—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by the front face comprising assemblies of felted or spongy material; comprising pads surrounded by a flexible material

Definitions

  • the invention relates to optical quality surfacing for surfaces such as a face of an ophthalmic lens or a camera lens or an instrument for observing distant objects or a face a semiconductor substrate.
  • Surfacing means any operation to modify the state of a previously shaped surface. These include polishing, grinding or etching operations to modify (decrease or increase) the roughness of the surface and / or to reduce the undulation.
  • a tool for surfacing an optical surface comprising: a rigid support having a transverse end surface; an elastically compressible interface secured to the rigid support, comprising a so-called central portion which is in line with said end surface of the rigid support and a so-called peripheral portion which is transversely beyond said end surface of the rigid support, having a first end transverse surface, a second end transverse surface and a lateral surface extending from the periphery of the first end surface to the periphery of the second end surface, said first end surface being applied against and covering said end surface of the rigid support; and a flexible pad adapted to be applied against a surface to be worked, subjected to the interface opposite to the rigid support, compris
  • the tool In order to reduce the roughness of the optical surface, the tool is brought into contact with the latter while maintaining sufficient tool pressure on it so that, by deformation of the interface, the pad conforms to the shape of the optical surface. .
  • the optical surface is rotated, its friction against the tool being sufficient to jointly drive it in rotation.
  • the surfacing operation requires an abrasive that can be contained in the buffer or in the fluid.
  • the elastically compressible interface compensates for the difference in curvature between the end surface of the tool support and the optical surface.
  • This tool provides an improvement in surface appearance, but under certain circumstances, such appearance defects still exist.
  • the invention aims to provide a surfacing tool particularly effective in minimizing appearance defects, particularly but not exclusively for concave working surfaces.
  • the membrane that comprises the tool according to the invention offers both a maintenance in tension of the buffer and a surround of the periphery of the interface.
  • the tool according to the invention allows the tool according to the invention to be particularly effective, particularly in terms of maintaining contact with the surface to be worked, including when it has large variations in altitude, for example when it 's acts on one side of a spectacle lens to correct the vision of a presbyopic, myopic and astigmatic carrier.
  • the tool according to the invention makes it possible to obtain a particularly high level of surfacing quality, in particular but not exclusively for concave surfaces.
  • the tool 10 illustrated in the drawings comprises a base 11, an elastically compressible interface 12 secured to the base 11, a flexible buffer 13 secured to the interface 12 opposite the base 11, a bending membrane 14 in tension of the buffer 13 and a deformable ring 16 interposed between the peripheral portion of the interface 12 and the straps 18 of the membrane 14.
  • the tool 10 is generally cylindrical with symmetry of revolution and has an axis of symmetry marked X which defines a so-called longitudinal direction.
  • the base 11 comprises a rigid core 20 and a flexible sole 21.
  • the side that is seen below on the figure 3 the base 11 has an end surface 25 which extends transversely.
  • the interface 12 has a first end surface 26, a second end surface 27 and a side surface 28 extending from the periphery of the surface 26 to the periphery of the surface 27.
  • the interface 12 has the general shape of a disk.
  • the interface 12 by its surface 26, is applied against and covers the surface 25 of the base 11.
  • Securing between the base 11 and the interface 12 is here by gluing on all surfaces 25 and 26.
  • the base 11 has a cavity 30 opening away from the end surface 25 and extending in the longitudinal direction over a part of the thickness of the base 11.
  • the cavity 30 is centrally disposed and is provided for mounting the tool 10 on the spindle head of a surfacing machine.
  • the cavity 30 has a spherical portion 31 generally shaped like three quarters of a sphere and a cylindrical portion 32 extending between the portion 31 and the outlet of the cavity 30.
  • the spindle head intended to be accommodated in the cavity 30 has a spherical portion end shaped as the portion 31 and a cylindrical portion of smaller diameter than the portion 32.
  • connection between the base 11 and the spindle of the machine is by simple snapping, the material surrounding the cylindrical portion 31 being capable of deforming so that the spherical portion of the spindle head is housed in the portion 32.
  • the tool 10 When the spindle head is engaged in the cavity 30, the tool 10 co-operates in a ball joint with respect to the spindle.
  • the cavity 30 is formed in the rigid core 20, which will now be described in more detail.
  • the core 20 comprises a body 35 and a head 36.
  • the body 35 comprises an annular flange 37 and a threaded stud 38 protruding from the flange 37 on the side which is seen at the top on the figure 2 , the stud 38 being disposed in the center of the flange 37.
  • cavity 30 is formed.
  • the end surface 40 of the body 35 that is seen down on the figure 3 is flat and continuous, the respective end surfaces of the flange 37 and the stud 38 being flush with each other.
  • the flange 37 is made of metal, for example steel, and the stud 38 is relatively rigid plastic overmolded on the flange 37.
  • the rigidity of the stud 38 is chosen so that it can all at once do not deform at the surface 40 and deform at the cylindrical portion 32 to allow the pin head to snap into the cavity 30.
  • the stud 38 On its external lateral surface protruding flange 37, the stud 38 has a thread allowing it to cooperate with the tapped bore that has in its center the head 36, which cooperates with the body 35 in the manner of a nut.
  • the head 36 has a generally annular shape of the same external diameter as the flange 37, with two lateral recesses 41 to release two flat faces 42 parallel to each other and parallel to the axial or longitudinal direction X, to allow tighten and loosen the head 36 relative to the flange 37 with a conventional nut wrench.
  • the sole 21 is here formed by a flexible slab 51.
  • the wafer 51 has the general shape of a disc having a diameter similar to that of the interface 12.
  • the wafer 51 is arranged concentrically with the rest of the tool, and in particular concentrically with the interface 12 and the core 20.
  • the wafer 51 here has a thickness similar to that of the membrane 14.
  • the slab 51 is secured to the core 20 by gluing its transverse end surface that is seen at the top on the figure 3 to the entire surface 40.
  • the transverse end surface of the slab 51 which is seen down on the figure 3 , forms the transverse end surface 25 of the base 11.
  • the central portion 51a of the wafer 51 located at the right end surface 40 can be considered as rigid since it can not flex as the peripheral portion 51b which is transversely beyond of the surface 40.
  • the elastically compressible interface 12 comprises a central portion 12a which lies at the right of the transverse end surface 40 or 25a and a peripheral portion 12b which is transversely beyond the transverse end surface 40 or 25a.
  • the flexible pad 13 has a central portion 13a which is at the right end surface 40 or 25a and a peripheral portion 13b which is transversely beyond the end surface 40 or 25a.
  • the pad 13 In the absence of stress, the pad 13 has the general shape of a disc of diameter slightly larger than that of the interface 12. The thickness of the pad 13 is substantially smaller than the thickness of the interface 12 .
  • the membrane 14 is made of elastically extensible material of substantially smaller thickness than the thickness of the interface 12.
  • the membrane 14 comprises a central plate 15 and a plurality of identical braces 18, here six in number, protruding radially from the periphery of the plate 15.
  • the membrane 14 is shown in bold line as placed on the rest of the tool 10, while one of the straps 18 is shown in FIG. flat dotted line.
  • buffer 13 and membrane 14 are shown flat.
  • the plate 15 has the general shape of a disk of diameter similar to that of the interface 12.
  • the central plateau 15 has, on the side that we see down on the figure 3 (side not visible on the figure 2 ), a transverse end surface 22 and, on the side that is seen at the top on the figure 3 (visible side on the figure 2 ), a transverse end surface 23.
  • the pad 13 is applied against and covers the end surface 22 and is secured to the membrane 14 by gluing over the entire surface 22.
  • the plate 15 On the side opposite to the pad 13, the plate 15 is applied against and covers the end surface 27 of the interface 12. Here, the plate 15 is secured to the interface 12 by bonding its end surface 23 to the the entire end surface 27 of the interface 12.
  • Each of the straps 18 has a distal portion in which is formed an opening 19 which is here oblong.
  • the openings 19 are shaped differently, for example by being circular.
  • the straps 18 are here in the form of a band whose width is greater on the side of the central plate 15 than on the side of the distal portion, the reduction in width being regular over the length of the straps.
  • the central plate 15 and the straps 18 are made in one piece from a disc of material in which were cut the spaces originally between the straps.
  • each of the straps 18 rotates around the lateral surface 28 of the interface 12 and around the deformable ring 16 and then extends to the stud 38 which is engaged in the opening 19, the stud 38 thus forming a means for attaching the distal portion of each strap 18 to the right of the end surface 26 of the interface 12.
  • the respective distal portions of the straps 18 are stacked one on the other and are sandwiched between the body 35 and the head 36 of the core 20.
  • each of the straps 18 When so engaged with the stud 38, each of the straps 18 is stretched, its arrangement, and in particular the location of the opening 19, having been provided accordingly.
  • This tensioning allows the buffer 13 to work in better conditions, and in particular eliminates or in any case greatly limits the risk of occurrence, during surfacing, folds on the pad 13.
  • the buffer 13 has, thanks to the plate 15 of the membrane 14, extra strength that makes it possible to use a particularly thin buffer 13.
  • the arrangement of the straps 18 is here such that the interface 12, under the effect of the tensioning provided by the straps 18, takes a conformation where its peripheral portion 12b is raised, so that the surface 70 of the buffer 13 intended to come into contact with the surface to be worked is slightly convex.
  • the tensioning of the buffer 13 through the membrane 14 offers the advantage of allowing easy adjustment of its intensity, by simply varying the location of the opening 19 of the shoulder straps 18, thus providing excellent repeatability. one tool to another.
  • the lens 72 to which the surface 71 belongs is mounted on a rotating support (not shown) and the tool 10 is applied against the surface 71 with a force sufficient for the pad 13 to conform to its shape.
  • the tool 10 is here, for its part, free to rotate while being however off-center with respect to the optical surface 71.
  • the relative friction of the working surface 71 and the buffer 13 is sufficient to rotate the tool 10 in the same direction as the lens 72, about the axis X of symmetry.
  • the optical surface 71 is sprayed with a non-abrasive or abrasive watering fluid, depending on whether or not the pad 13 performs this function.
  • the tool 10 In order to scan the entire optical surface 71, the tool 10 is moved during the surfacing along a radial path, the point of intersection of the X axis of the tool 10 with the optical surface 71 making a movement. back and forth between two cusp points.
  • the membrane 14 offers both a maintenance of tension of the buffer 13 and a surround of the periphery of the interface 12, allows the tool to be particularly effective in maintaining the contact with the surface 71 to work, including when it has large variations in altitude, for example if it is a side of a spectacle lens to correct the vision of a presbyopic wearer, myopic and astigmatic.
  • the presence of the flange 61 is also favorable to the uniform distribution of the pressure exerted on the surface to be worked.
  • the figure 5 illustrates a variant of the tool 10 in which the attachment means for engaging the distal portions of the straps 18 are not formed by the stud 38 of the core 20, but by projecting studs of the sole 61.
  • the wafer 51 is replaced by a wafer 51 'having in an intermediate position between the core 20 and the ring 16, a protruding nipple 55 protruding from the side that is seen at the top on the figure 3 , that is to say the opposite of the interface 12.
  • the straps 18 are shorter so that they can operate the desired tensioning by engagement of their opening 19 on the corresponding stud 55.
  • the slab 51 'and the stud 55 are made of one-piece molded material, but it is of course possible to return the stud 55 or the like by gluing or any other fastening means.
  • the attachment means of the straps such as 18, while remaining at the right of the end surface 26 of the interface 12, are different from the stud 38 and pins 55, for example, at least for certain straps, a portion of the spindle on which the tool is mounted; nipples similar to the pins 55 distributed around the periphery of a core such as 20 or a rigid support such as 60; or else fastening means not belonging to a core or rigid support, for example hooks located at locations similar to those of the pins 55.
  • the securing between the assembly formed by the pad 13 and the membrane 14 to the rest of the tool comprises the bonding of the central plate 15 to the interface 12. This prevents the plate 15 can slide with respect to the interface 12.
  • the securing between the assembly formed by the pad such as 13 and the membrane such as 14 is only by the shoulder straps such as 18.
  • the core such as 20 or the rigid support 60 such as the rest of the tool subject to the straps, such as 18.
  • the diameter of the buffer 13 is greater than the diameter of the plate 15. In a variant, the diameter of the buffer 13 is different, for example identical or even slightly smaller than the diameter of the plate 15.
  • the buffer 13 is directly glued to the plate 15.
  • an intermediate wafer is interposed between the buffer 13 and the plate 15.
  • the end surface such as 40 or 25a is not flat but convex and / or the interface such as 12 has an initial conformation curved correspondingly while remaining equi-thick.
  • the wafer 51 has a thickness substantially different from that of the membrane 14; an additional wafer, smaller in diameter than the wafer 51 and larger in diameter than the flange 37, is interposed between the flange 37 and the wafer 51; the rigid support 60 and the collar 61 are replaced by a rigid support and a collar arranged differently, for example as described in the French patent application 2,900,356 to which corresponds the international demand WO 2007/128894 ; and / or there is no such flange.

Description

DOMAINE DE L'INVENTIONFIELD OF THE INVENTION

L'invention a trait au surfaçage à qualité optique, pour des surfaces telles qu'une face d'un verre ophtalmique ou d'une lentille d'appareil photographique ou d'un instrument destiné à l'observation des objets éloignés ou encore une face d'un substrat semi-conducteur.The invention relates to optical quality surfacing for surfaces such as a face of an ophthalmic lens or a camera lens or an instrument for observing distant objects or a face a semiconductor substrate.

Par surfaçage, on entend toute opération visant à modifier l'état d'une surface préalablement façonnée. Il s'agit notamment d'opérations de polissage, doucissage ou dépolissage visant à modifier (diminuer ou augmenter) la rugosité de la surface et/ou à en diminuer l'ondulation.Surfacing means any operation to modify the state of a previously shaped surface. These include polishing, grinding or etching operations to modify (decrease or increase) the roughness of the surface and / or to reduce the undulation.

ARRIERE-PLAN TECHNOLOGIQUEBACKGROUND

On connaît déjà, notamment par la demande de brevet français 2 834 662 à laquelle correspond la demande de brevet américain 2005/0101235 , par la demande de brevet français 2 857 610 à laquelle correspond la demande de brevet américain 2006/0154581 et par la demande de brevet français 2 900 356 à laquelle correspond la demande internationale WO 2007/128894 , un outil de surfaçage d'une surface optique, comportant : un support rigide présentant une surface transversale d'extrémité ; une interface élastiquement compressible assujettie au support rigide, comportant une partie dite centrale qui se trouve au droit de ladite surface d'extrémité du support rigide et une partie dite périphérique qui se trouve transversalement au-delà de ladite surface d'extrémité du support rigide, présentant une première surface transversale d'extrémité, une seconde surface transversale d'extrémité et une surface latérale s'étendant de la périphérie de la première surface d'extrémité à la périphérie de la seconde surface d'extrémité, ladite première surface d'extrémité étant appliquée contre et recouvrant ladite surface d'extrémité du support rigide ; et un tampon flexible apte à être appliqué contre une surface à travailler, assujetti à l'interface à l'opposé du support rigide, comportant une partie dite centrale qui se trouve au droit de ladite surface d'extrémité du support rigide et une partie dite périphérique qui se trouve transversalement au-delà de ladite surface d'extrémité du support rigide.We already know, especially by the French patent application 2,834,662 to which corresponds the US patent application 2005/0101235 , by the French patent application 2,857,610 to which corresponds the US patent application 2006/0154581 and by the French patent application 2,900,356 to which corresponds the international demand WO 2007/128894 , a tool for surfacing an optical surface, comprising: a rigid support having a transverse end surface; an elastically compressible interface secured to the rigid support, comprising a so-called central portion which is in line with said end surface of the rigid support and a so-called peripheral portion which is transversely beyond said end surface of the rigid support, having a first end transverse surface, a second end transverse surface and a lateral surface extending from the periphery of the first end surface to the periphery of the second end surface, said first end surface being applied against and covering said end surface of the rigid support; and a flexible pad adapted to be applied against a surface to be worked, subjected to the interface opposite to the rigid support, comprising a so-called central portion which lies in line with said end surface of the rigid support and a so-called peripheral portion which is transversely beyond said end surface of the rigid support.

Pour diminuer la rugosité de la surface optique, on amène l'outil au contact de celle-ci en maintenant sur elle une pression suffisante de l'outil pour que, par déformation de l'interface, le tampon épouse la forme de la surface optique.In order to reduce the roughness of the optical surface, the tool is brought into contact with the latter while maintaining sufficient tool pressure on it so that, by deformation of the interface, the pad conforms to the shape of the optical surface. .

Tout en arrosant la surface optique au moyen d'un fluide, on l'entraîne en rotation par rapport à l'outil (ou réciproquement) et on la balaye au moyen de ce dernier.While watering the optical surface with a fluid, it is rotated relative to the tool (or reciprocally) and is scanned by means of the latter.

Généralement, on entraîne en rotation la surface optique, son frottement contre l'outil étant suffisant pour entraîner conjointement celui-ci en rotation.Generally, the optical surface is rotated, its friction against the tool being sufficient to jointly drive it in rotation.

L'opération de surfaçage nécessite un abrasif qui peut être contenu dans le tampon ou dans le fluide.The surfacing operation requires an abrasive that can be contained in the buffer or in the fluid.

Au cours du surfaçage, l'interface, élastiquement compressible, permet de compenser la différence de courbure entre la surface d'extrémité du support de l'outil et la surface optique.During surfacing, the elastically compressible interface compensates for the difference in curvature between the end surface of the tool support and the optical surface.

Les résultats procurés par ces outils sont en général satisfaisants, mais il est parfois difficile d'éviter certains défauts d'aspect, notamment l'effet de peau d'orange (en anglais : orange skin) et de moutonné (en anglais : sheeplike).The results obtained by these tools are in general satisfactory, but it is sometimes difficult to avoid certain defects of appearance, in particular the effect of orange peel (in English: orange skin) and of moutonne (in English: sheeplike) .

On a déjà proposé, pour remédier à ces défauts d'aspect, de donner au tampon flexible un diamètre plus grand que le diamètre de l'interface de sorte que le tampon présente une portion annulaire saillant transversalement au-delà de l'interface.It has already been proposed, in order to remedy these appearance defects, to give the flexible pad a diameter greater than the diameter of the interface so that the pad has an annular portion protruding transversely beyond the interface.

Cet outil procure une amélioration de l'aspect de surface, mais dans certaines circonstances, il subsiste encore de tels défauts d'aspect.This tool provides an improvement in surface appearance, but under certain circumstances, such appearance defects still exist.

OBJET DE L'INVENTIONOBJECT OF THE INVENTION

L'invention vise à fournir un outil de surfaçage particulièrement performant en matière de minimisation des défauts d'aspect, en particulier mais non exclusivement pour les surfaces à travailler concaves.The invention aims to provide a surfacing tool particularly effective in minimizing appearance defects, particularly but not exclusively for concave working surfaces.

Elle propose à cet effet un outil de surfaçage à qualité optique, comportant : un support rigide présentant une surface transversale d'extrémité ; une interface élastiquement compressible assujettie au support rigide, comportant une partie dite centrale qui se trouve au droit de ladite surface d'extrémité du support rigide et une partie dite périphérique qui se trouve transversalement au-delà de ladite surface d'extrémité du support rigide, présentant une première surface transversale d'extrémité, une seconde surface transversale d'extrémité et une surface latérale s'étendant de la périphérie de la première surface d'extrémité à la périphérie de la seconde surface d'extrémité, ladite première surface d'extrémité étant appliquée contre et recouvrant ladite surface d'extrémité du support rigide ; et un tampon flexible apte à être appliqué contre une surface à travailler, assujetti à l'interface à l'opposé du support rigide, comportant une partie dite centrale qui se trouve au droit de ladite surface d'extrémité du support rigide et une partie dite périphérique qui se trouve transversalement au-delà de ladite surface d'extrémité du support rigide ; caractérisé en ce que ledit tampon est porté par une membrane élastiquement extensible, laquelle membrane comporte :

  • un plateau central présentant une première surface transversale d'extrémité sur laquelle est collé ledit tampon et une seconde surface transversale d'extrémité appliquée contre et recouvrant ladite seconde surface transversale d'extrémité de ladite interface ; et
  • une pluralité de bretelles saillant chacune radialement de la périphérie dudit plateau et présentant chacune une partie distale en prise avec un moyen d'attache situé au droit de la première surface d'extrémité de l'interface, chaque dite bretelle tournant autour de ladite surface latérale de l'interface puis s'étendant jusqu'audit moyen d'attache, chaque dite bretelle étant tendue.
It proposes for this purpose an optical quality surfacing tool, comprising: a rigid support having a transverse end surface; an elastically compressible interface subject to the rigid support, having a so-called central portion which is in line with said end surface of the rigid support and a so-called peripheral portion which is transversely beyond said end surface of the rigid support, having a first transverse end surface, a second end transverse surface and a lateral surface extending from the periphery of the first end surface to the periphery of the second end surface, said first end surface being applied against and covering said surface of end of the rigid support; and a flexible pad adapted to be applied against a surface to be worked, secured to the interface opposite the rigid support, comprising a so-called central portion which is located at the right of said end surface of the rigid support and a so-called device which is transversely beyond said end surface of the rigid support; characterized in that said tampon is carried by an elastically extensible membrane, which membrane comprises:
  • a central plate having a first end transverse surface on which said pad is bonded and a second end transverse surface applied against and covering said second transverse end surface of said interface; and
  • a plurality of shoulder straps each projecting radially from the periphery of said plate and each having a distal portion engaged with a fastening means located in line with the first end surface of the interface, each said strap turning about said lateral surface of the interface and extending to said fastening means, each said strap being tensioned.

La membrane que comporte l'outil selon l'invention offre tout à la fois un maintien en tension du tampon et un ceinturage de la périphérie de l'interface.The membrane that comprises the tool according to the invention offers both a maintenance in tension of the buffer and a surround of the periphery of the interface.

Cela permet à l'outil selon l'invention d'être particulièrement performant, notamment en matière de maintien du contact avec la surface à travailler, y compris lorsque celle-ci présente de fortes variations d'altitude, par exemple lorsqu'il s'agit d'une face d'un verre de lunettes pour corriger la vision d'un porteur presbyte, myope et astigmate.This allows the tool according to the invention to be particularly effective, particularly in terms of maintaining contact with the surface to be worked, including when it has large variations in altitude, for example when it 's acts on one side of a spectacle lens to correct the vision of a presbyopic, myopic and astigmatic carrier.

Grâce à ses performances en matière de maintien du contact avec la surface à travailler, l'outil selon l'invention permet d'obtenir une qualité de surfaçage particulièrement élevée, en particulier mais non exclusivement pour des surfaces concaves.Thanks to its performance in maintaining contact with the surface to be worked, the tool according to the invention makes it possible to obtain a particularly high level of surfacing quality, in particular but not exclusively for concave surfaces.

Selon des caractéristiques préférées de mise en oeuvre de la membrane que comporte l'outil selon l'invention :

  • une ouverture est ménagée dans la partie distale de chaque dite bretelle afin d'engager cette partie distale sur un élément saillant formant ledit moyen d'attache ;
  • ladite ouverture est oblongue ;
  • ledit élément saillant appartient audit support rigide ;
  • ledit élément saillant appartient à une collerette entourant ledit support rigide ;
  • ledit plateau central et lesdites bretelles de ladite membrane sont faits d'une seule pièce ; et/ou
  • ledit plateau central est collé par sa seconde surface d'extrémité à ladite seconde surface d'extrémité de ladite interface.
According to preferred characteristics of implementation of the membrane that comprises the tool according to the invention:
  • an opening is provided in the distal portion of each said strap to engage the distal portion on a projecting member forming said attachment means;
  • said opening is oblong;
  • said projecting element belongs to said rigid support;
  • said projecting element belongs to a flange surrounding said rigid support;
  • said central plate and said shoulder straps of said membrane are made in one piece; and or
  • said central plate is adhered by its second end surface to said second end surface of said interface.

Selon d'autres caractéristiques préférées en raison du supplément de performances qu'elles procurent :

  • l'outil comporte en outre un anneau déformable interposé entre ladite partie périphérique de l'interface et lesdites bretelles ;
  • ledit support rigide appartient à une embase comportant une collerette flexible entourant ledit support, ladite interface élastiquement compressible étant appliquée contre et recouvrant une surface d'extrémité de ladite collerette située du même côté que ladite surface d'extrémité ; et/ou
  • ladite embase comporte un noyau rigide présentant une surface transversale d'extrémité et une semelle flexible appliquée contre et recouvrant ladite surface d'extrémité, ledit support rigide étant formé par ledit noyau rigide et par une partie dite centrale de ladite semelle située au droit de ladite surface transversale d'extrémité du noyau, ladite collerette étant formée par une partie dite périphérique de ladite semelle, s'étendant transversalement au-delà de ladite surface d'extrémité dudit noyau rigide.
According to other preferred features because of the extra performance they provide:
  • the tool further comprises a deformable ring interposed between said peripheral portion of the interface and said shoulder straps;
  • said rigid support belongs to a base comprising a flexible collar surrounding said support, said elastically compressible interface being applied against and covering an end surface of said collar located on the same side as said end surface; and or
  • said base comprises a rigid core having a transverse end surface and a flexible soleplate applied against and covering said end surface, said rigid support being formed by said rigid core and by a so-called central portion of said sole located at the right of said transverse end surface of the core, said flange being formed by a so-called peripheral portion of said flange, extending transversely beyond said end surface of said rigid core.

BREVE DESCRIPTION DES DESSINSBRIEF DESCRIPTION OF THE DRAWINGS

L'exposé de l'invention sera maintenant poursuivi par la description détaillée d'exemples de réalisation, donnée ci-après à titre illustratif et non limitatif, en référence aux dessins annexés. Sur ceux-ci :

  • la figure 1 est une vue en plan d'un outil de surfaçage conforme à l'invention ;
  • la figure 2 est une vue de dessus de l'ensemble formé de la membrane de mise en tension et du tampon, illustré à plat ;
  • la figure 3 est la vue en coupe repérée par III-III sur la figure 1 ;
  • la figure 4 est une vue semblable à la figure 3, mais montrant comment se déforme l'outil au contact d'une surface à travailler concave ; et
  • la figure 5 est une vue partielle en coupe montrant une variante des moyens d'attache des bretelles.
The description of the invention will now be continued by the detailed description of exemplary embodiments, given below by way of illustration and without limitation, with reference to the appended drawings. On these:
  • the figure 1 is a plan view of a surfacing tool according to the invention;
  • the figure 2 is a top view of the assembly formed of the tensioning membrane and the buffer, shown flat;
  • the figure 3 is the sectional view marked by III-III on the figure 1 ;
  • the figure 4 is a view similar to the figure 3 but showing how the tool deforms in contact with a concave working surface; and
  • the figure 5 is a partial sectional view showing a variant of the attachment means of the straps.

DESCRIPTION DETAILLEE D'EXEMPLES DE REALISATIONDETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

L'outil 10 illustré sur les dessins comporte une embase 11, une interface élastiquement compressible 12 assujettie à l'embase 11, un tampon flexible 13 assujetti à l'interface 12 à l'opposé de l'embase 11, une membrane 14 de mise en tension du tampon 13 et un anneau déformable 16 interposé entre la partie périphérique de l'interface 12 et les bretelles 18 de la membrane 14.The tool 10 illustrated in the drawings comprises a base 11, an elastically compressible interface 12 secured to the base 11, a flexible buffer 13 secured to the interface 12 opposite the base 11, a bending membrane 14 in tension of the buffer 13 and a deformable ring 16 interposed between the peripheral portion of the interface 12 and the straps 18 of the membrane 14.

D'une façon générale, à l'exception de la membrane 14, l'outil 10 est globalement cylindrique à symétrie de révolution et présente un axe de symétrie noté X qui définit une direction dite longitudinale.In general, with the exception of the membrane 14, the tool 10 is generally cylindrical with symmetry of revolution and has an axis of symmetry marked X which defines a so-called longitudinal direction.

L'embase 11 comporte un noyau rigide 20 et une semelle flexible 21. Du côté que l'on voit en bas sur la figure 3, l'embase 11 présente une surface d'extrémité 25 qui s'étend transversalement.The base 11 comprises a rigid core 20 and a flexible sole 21. The side that is seen below on the figure 3 the base 11 has an end surface 25 which extends transversely.

En l'absence de contrainte, soit dans une position non représentée car la membrane de mise en tension 14 agit sur la semelle 21 y compris dans la position de repos illustrée sur les figures 1 et 3, la surface d'extrémité 25 est plane.In the absence of stress, or in a position not shown because the tensioning membrane 14 acts on the sole 21 including in the rest position shown on the figures 1 and 3 the end surface 25 is flat.

L'interface 12 présente une première surface d'extrémité 26, un seconde surface d'extrémité 27 et une surface latérale 28 s'étendant de la périphérie de la surface 26 à la périphérie de la surface 27.The interface 12 has a first end surface 26, a second end surface 27 and a side surface 28 extending from the periphery of the surface 26 to the periphery of the surface 27.

En l'absence de contrainte, soit, comme expliqué ci-dessus, dans une position non illustrée, l'interface 12 a la forme générale d'un disque.In the absence of stress, or, as explained above, in a position not shown, the interface 12 has the general shape of a disk.

L'interface 12, par sa surface 26, est appliquée contre et recouvre la surface 25 de l'embase 11.The interface 12, by its surface 26, is applied against and covers the surface 25 of the base 11.

L'assujettissement entre l'embase 11 et l'interface 12 se fait ici par collage sur la totalité des surfaces 25 et 26.Securing between the base 11 and the interface 12 is here by gluing on all surfaces 25 and 26.

L'embase 11 présente une cavité 30 débouchant à l'opposé de la surface d'extrémité 25 et s'étendant suivant la direction longitudinale sur une partie de l'épaisseur de l'embase 11.The base 11 has a cavity 30 opening away from the end surface 25 and extending in the longitudinal direction over a part of the thickness of the base 11.

La cavité 30 est disposée de façon centrale et est prévue pour le montage de l'outil 10 sur la tête de la broche d'une machine de surfaçage.The cavity 30 is centrally disposed and is provided for mounting the tool 10 on the spindle head of a surfacing machine.

La cavité 30 présente une portion sphérique 31 conformée globalement comme les trois quarts d'une sphère et une portion cylindrique 32 s'étendant entre la portion 31 et le débouché de la cavité 30.The cavity 30 has a spherical portion 31 generally shaped like three quarters of a sphere and a cylindrical portion 32 extending between the portion 31 and the outlet of the cavity 30.

La tête de broche prévue pour être accueillie dans la cavité 30 comporte une extrémité en portion de sphère conformée comme la portion 31 et une portion cylindrique de plus petit diamètre que la portion 32.The spindle head intended to be accommodated in the cavity 30 has a spherical portion end shaped as the portion 31 and a cylindrical portion of smaller diameter than the portion 32.

L'assemblage entre l'embase 11 et la broche de la machine se fait par simple encliquetage, la matière entourant la portion cylindrique 31 étant capable de se déformer pour que la partie sphérique de la tête de la broche se loge dans la portion 32.The connection between the base 11 and the spindle of the machine is by simple snapping, the material surrounding the cylindrical portion 31 being capable of deforming so that the spherical portion of the spindle head is housed in the portion 32.

Lorsque la tête de broche est engagée dans la cavité 30, l'outil 10 coopère en liaison rotule par rapport à la broche.When the spindle head is engaged in the cavity 30, the tool 10 co-operates in a ball joint with respect to the spindle.

La cavité 30 est ménagée dans le noyau rigide 20, que l'on va maintenant décrire plus en détail.The cavity 30 is formed in the rigid core 20, which will now be described in more detail.

Le noyau 20 comporte un corps 35 et une tête 36.The core 20 comprises a body 35 and a head 36.

Le corps 35 comporte un flasque annulaire 37 et un goujon fileté 38 saillant du flasque 37 du côté que l'on voit en haut sur la figure 2, le goujon 38 étant disposé au centre du flasque 37.The body 35 comprises an annular flange 37 and a threaded stud 38 protruding from the flange 37 on the side which is seen at the top on the figure 2 , the stud 38 being disposed in the center of the flange 37.

C'est dans le goujon 38 qu'est ménagée la cavité 30.It is in the stud 38 that cavity 30 is formed.

La surface d'extrémité 40 du corps 35 que l'on voit en bas sur la figure 3, est plate et continue, les surfaces d'extrémité respectives du flasque 37 et du goujon 38 étant à fleur l'une de l'autre.The end surface 40 of the body 35 that is seen down on the figure 3 , is flat and continuous, the respective end surfaces of the flange 37 and the stud 38 being flush with each other.

En pratique, ici, le flasque 37 est en métal, par exemple en acier, et le goujon 38 est en matière plastique relativement rigide surmoulée sur le flasque 37. La rigidité du goujon 38 est choisie pour que celui-ci puisse tout à la fois ne pas se déformer au niveau de la surface 40 et se déformer au niveau de la portion cylindrique 32 pour permettre l'encliquetage de la tête de broche dans la cavité 30.In practice, here, the flange 37 is made of metal, for example steel, and the stud 38 is relatively rigid plastic overmolded on the flange 37. The rigidity of the stud 38 is chosen so that it can all at once do not deform at the surface 40 and deform at the cylindrical portion 32 to allow the pin head to snap into the cavity 30.

Sur sa surface latérale externe saillant du flasque 37, le goujon 38 présente un filetage lui permettant de coopérer avec l'alésage taraudé que présente en son centre la tête 36, laquelle coopère avec le corps 35 à la façon d'un écrou.On its external lateral surface protruding flange 37, the stud 38 has a thread allowing it to cooperate with the tapped bore that has in its center the head 36, which cooperates with the body 35 in the manner of a nut.

En pratique, ici, la tête 36 a une forme globalement annulaire de même diamètre externe que le flasque 37, avec deux évidements latéraux 41 pour dégager deux faces plates 42 parallèles entre elles et parallèles à la direction axiale ou longitudinale X, afin de permettre de serrer et de desserrer la tête 36 par rapport au flasque 37 avec une clé conventionnelle pour écrou.In practice, here, the head 36 has a generally annular shape of the same external diameter as the flange 37, with two lateral recesses 41 to release two flat faces 42 parallel to each other and parallel to the axial or longitudinal direction X, to allow tighten and loosen the head 36 relative to the flange 37 with a conventional nut wrench.

La semelle 21 est ici formée par une galette flexible 51.The sole 21 is here formed by a flexible slab 51.

En l'absence de contrainte, la galette 51 a la forme générale d'un disque ayant un diamètre semblable à celui de l'interface 12.In the absence of stress, the wafer 51 has the general shape of a disc having a diameter similar to that of the interface 12.

La galette 51 est disposée concentriquement au reste de l'outil, et en particulier concentriquement à l'interface 12 et au noyau 20.The wafer 51 is arranged concentrically with the rest of the tool, and in particular concentrically with the interface 12 and the core 20.

La galette 51 a ici une épaisseur semblable à celle de la membrane 14.The wafer 51 here has a thickness similar to that of the membrane 14.

La galette 51 est assujettie au noyau 20 par collage de sa surface transversale d'extrémité que l'on voit en haut sur la figure 3 à la totalité de la surface 40.The slab 51 is secured to the core 20 by gluing its transverse end surface that is seen at the top on the figure 3 to the entire surface 40.

La surface transversale d'extrémité de la galette 51 que l'on voit en bas sur la figure 3, forme la surface transversale d'extrémité 25 de l'embase 11.The transverse end surface of the slab 51 which is seen down on the figure 3 , forms the transverse end surface 25 of the base 11.

Compte-tenu de la rigidité de la surface d'extrémité 40 du noyau 20 et de l'absence de compressibilité suivant la direction axiale ou longitudinale X de la galette 51, ou en tout cas de sa très faible compressibilité en comparaison de la compressibilité de l'interface 12, la portion centrale 51a de la galette 51 située au droit de la surface d'extrémité 40 peut être considérée comme rigide puisqu'elle ne peut pas fléchir comme la portion périphérique 51 b qui se trouve transversalement au-delà de la surface 40.Given the rigidity of the end surface 40 of the core 20 and the absence of compressibility in the axial or longitudinal direction X of the wafer 51, or in any case its very low compressibility in comparison with the compressibility of the interface 12, the central portion 51a of the wafer 51 located at the right end surface 40 can be considered as rigid since it can not flex as the peripheral portion 51b which is transversely beyond of the surface 40.

Ainsi, l'embase 11 comporte :

  • un support rigide 60 formé par le noyau 20 et la partie centrale 51a de la galette 51, ce support rigide présentant une surface transversale d'extrémité correspondant à la partie centrale 25a de la surface 25 située au droit de la surface d'extrémité 40 ; et
  • une collerette flexible 61, formée par la partie périphérique 51 b de la galette 51, cette collerette entourant le support rigide 60, l'interface élastiquement compressible 12 étant appliquée contre et recouvrant la surface d'extrémité 25b de la collerette 61 et la surface d'extrémité 25a du support rigide 60.
Thus, the base 11 comprises:
  • a rigid support 60 formed by the core 20 and the central portion 51a of the wafer 51, this rigid support having a transverse end surface corresponding to the central portion 25a of the surface 25 located to the right of the end surface 40; and
  • a flexible collar 61, formed by the peripheral portion 51b of the wafer 51, this collar surrounding the rigid support 60, the elastically compressible interface 12 being applied against and covering the end surface 25b of the collar 61 and the surface of end 25a of the rigid support 60.

On notera que l'interface élastiquement compressible 12 comporte une partie centrale 12a qui se trouve au droit de la surface transversale d'extrémité 40 ou 25a et une partie périphérique 12b qui se trouve transversalement au-delà de la surface d'extrémité transversale 40 ou 25a.It will be noted that the elastically compressible interface 12 comprises a central portion 12a which lies at the right of the transverse end surface 40 or 25a and a peripheral portion 12b which is transversely beyond the transverse end surface 40 or 25a.

De même, le tampon flexible 13 comporte une partie centrale 13a qui se trouve au droit de la surface d'extrémité 40 ou 25a et une partie périphérique 13b qui se trouve transversalement au-delà de la surface d'extrémité 40 ou 25a.Similarly, the flexible pad 13 has a central portion 13a which is at the right end surface 40 or 25a and a peripheral portion 13b which is transversely beyond the end surface 40 or 25a.

En l'absence de contrainte, le tampon 13 a la forme générale d'un disque de diamètre légèrement plus grand que celui de l'interface 12. L'épaisseur du tampon 13 est sensiblement plus faible que l'épaisseur de l'interface 12.In the absence of stress, the pad 13 has the general shape of a disc of diameter slightly larger than that of the interface 12. The thickness of the pad 13 is substantially smaller than the thickness of the interface 12 .

La membrane 14 est réalisée en matériau élastiquement extensible d'épaisseur sensiblement plus faible que l'épaisseur de l'interface 12.The membrane 14 is made of elastically extensible material of substantially smaller thickness than the thickness of the interface 12.

Comme on le voit plus particulièrement sur la figure 2, la membrane 14 comporte un plateau central 15 et une pluralité de bretelles identiques 18, ici au nombre de six, saillant radialement de la périphérie du plateau 15.As we see more particularly on the figure 2 , the membrane 14 comprises a central plate 15 and a plurality of identical braces 18, here six in number, protruding radially from the periphery of the plate 15.

Sur la figure 1, la membrane 14 est montrée en trait fort telle que mise en place sur le reste de l'outil 10, tandis que l'une des bretelles 18 est montrée à plat en trait mixte. Sur la figure 2, le tampon 13 et la membrane 14 sont montrés à plat.On the figure 1 , the membrane 14 is shown in bold line as placed on the rest of the tool 10, while one of the straps 18 is shown in FIG. flat dotted line. On the figure 2 buffer 13 and membrane 14 are shown flat.

En l'absence de contrainte, le plateau 15 a la forme générale d'un disque de diamètre semblable à celui de l'interface 12.In the absence of stress, the plate 15 has the general shape of a disk of diameter similar to that of the interface 12.

Le plateau central 15 présente, du côté que l'on voit en bas sur la figure 3 (côté non visible sur la figure 2), une surface transversale d'extrémité 22 et, du côté que l'on voit en haut sur la figure 3 (côté visible sur la figure 2), une surface transversale d'extrémité 23.The central plateau 15 has, on the side that we see down on the figure 3 (side not visible on the figure 2 ), a transverse end surface 22 and, on the side that is seen at the top on the figure 3 (visible side on the figure 2 ), a transverse end surface 23.

Ici, le tampon 13 est appliqué contre et recouvre la surface d'extrémité 22 et est assujetti à la membrane 14 par collage sur la totalité de la surface 22.Here, the pad 13 is applied against and covers the end surface 22 and is secured to the membrane 14 by gluing over the entire surface 22.

Du côté opposé au tampon 13, le plateau 15 est appliqué contre et recouvre la surface d'extrémité 27 de l'interface 12. Ici, le plateau 15 est assujetti à l'interface 12 par collage de sa surface d'extrémité 23 sur la totalité de la surface d'extrémité 27 de l'interface 12.On the side opposite to the pad 13, the plate 15 is applied against and covers the end surface 27 of the interface 12. Here, the plate 15 is secured to the interface 12 by bonding its end surface 23 to the the entire end surface 27 of the interface 12.

Chacune des bretelles 18 présente une partie distale dans laquelle est ménagée une ouverture 19 qui est ici oblongue.Each of the straps 18 has a distal portion in which is formed an opening 19 which is here oblong.

En variante, les ouvertures 19 sont conformées différemment, par exemple en étant circulaires.Alternatively, the openings 19 are shaped differently, for example by being circular.

Les bretelles 18 ont ici la forme d'une bande dont la largeur est plus grande du côté du plateau central 15 que du côté de la portion distale, la diminution de largeur étant régulière sur la longueur des bretelles.The straps 18 are here in the form of a band whose width is greater on the side of the central plate 15 than on the side of the distal portion, the reduction in width being regular over the length of the straps.

Ici, le plateau central 15 et les bretelles 18 sont faits d'une seule pièce à partir d'un disque de matière dans lequel ont été découpés les espaces se trouvant à l'origine entre les bretelles.Here, the central plate 15 and the straps 18 are made in one piece from a disc of material in which were cut the spaces originally between the straps.

Dans l'outil 10, chacune des bretelles 18 tourne autour de la surface latérale 28 de l'interface 12 et autour de l'anneau déformable 16 puis s'étend jusqu'au goujon 38 qui est engagé dans l'ouverture 19, le goujon 38 formant ainsi un moyen d'attache de la partie distale de chaque bretelle 18 au droit de la surface d'extrémité 26 de l'interface 12.In the tool 10, each of the straps 18 rotates around the lateral surface 28 of the interface 12 and around the deformable ring 16 and then extends to the stud 38 which is engaged in the opening 19, the stud 38 thus forming a means for attaching the distal portion of each strap 18 to the right of the end surface 26 of the interface 12.

Les parties distales respectives des bretelles 18 sont empilées les unes sur les autres et sont enserrées entre le corps 35 et la tête 36 du noyau 20.The respective distal portions of the straps 18 are stacked one on the other and are sandwiched between the body 35 and the head 36 of the core 20.

Lorsqu'elle est ainsi en prise avec le goujon 38, chacune des bretelles 18 est tendue, son agencement, et en particulier l'emplacement de l'ouverture 19, ayant été prévu en conséquence.When so engaged with the stud 38, each of the straps 18 is stretched, its arrangement, and in particular the location of the opening 19, having been provided accordingly.

La mise en prise des bretelles 18 sur le goujon 38 procure ainsi une mise en tension du plateau central 15 de la membrane 14, et donc une mise en tension du tampon 13 qui est collé sur le plateau 15.The engagement of the straps 18 on the stud 38 thus provides a tensioning of the central plate 15 of the membrane 14, and thus a tensioning of the buffer 13 which is stuck on the plate 15.

Cette mise en tension permet au tampon 13 de travailler dans de meilleures conditions, et en particulier élimine ou en tous cas limite fortement les risques d'apparition, lors du surfaçage, de plis sur le tampon 13.This tensioning allows the buffer 13 to work in better conditions, and in particular eliminates or in any case greatly limits the risk of occurrence, during surfacing, folds on the pad 13.

En outre, le tampon 13 bénéficie, grâce au plateau 15 de la membrane 14, d'un supplément de tenue qui rend possible l'utilisation d'un tampon 13 particulièrement mince.In addition, the buffer 13 has, thanks to the plate 15 of the membrane 14, extra strength that makes it possible to use a particularly thin buffer 13.

L'agencement des bretelles 18 est ici tel que l'interface 12, sous l'effet de la mise en tension procurée par les bretelles 18, prend une conformation où sa partie périphérique 12b est relevée, de sorte que la surface 70 du tampon 13 prévue pour venir au contact de la surface à travailler est légèrement convexe.The arrangement of the straps 18 is here such that the interface 12, under the effect of the tensioning provided by the straps 18, takes a conformation where its peripheral portion 12b is raised, so that the surface 70 of the buffer 13 intended to come into contact with the surface to be worked is slightly convex.

On notera que la mise en tension du tampon 13 grâce à la membrane 14 offre l'intérêt de permettre un réglage aisé de son intensité, par simple variation de l'emplacement de l'ouverture 19 des bretelles 18, offrant ainsi une excellente répétabilité d'un outil à l'autre.Note that the tensioning of the buffer 13 through the membrane 14 offers the advantage of allowing easy adjustment of its intensity, by simply varying the location of the opening 19 of the shoulder straps 18, thus providing excellent repeatability. one tool to another.

On notera d'ailleurs qu'il est possible de prévoir plusieurs orifices tels que 19 sur les bretelles 18, afin d'offrir, avec une même membrane telle que 14, plusieurs intensités de mise en tension du tampon tel que 13.It will be noted moreover that it is possible to provide several orifices such as 19 on the shoulder straps 18, in order to offer, with the same membrane such as 14, several intensities of tensioning of the buffer such as 13.

On notera encore que le fait d'entourer la surface latérale 28 de l'interface 12 avec les bretelles 18 procure un effet de ceinturage qui est favorable au comportement de l'outil 10 lors des déformations, en particulier parce qu'un tel ceinturage s'oppose au cisaillement de l'interface 12 à sa périphérie.It will also be noted that surrounding the lateral surface 28 of the interface 12 with the shoulder straps 18 provides a belting effect which is favorable to the behavior of the tool 10 during the deformations, in particular because such belts opposes shearing of the interface 12 at its periphery.

Lorsque l'outil 10 est appliqué contre une surface à travailler concave telle que la surface 71 montrée sur la figure 4, l'interface élastiquement compressible 12 se déforme pour permettre à la surface 70 d'épouser la surface 71.When the tool 10 is applied against a concave working surface such as the surface 71 shown on the figure 4 the elastically compressible interface 12 is deformed to allow the surface 70 to conform to the surface 71.

On voit que l'interface 12 se comprime fortement au niveau de la partie centrale 12a.It can be seen that the interface 12 compresses strongly at the level of the central portion 12a.

Pour effectuer une opération de surfaçage, la lentille 72 à laquelle appartient la surface 71 est montée sur un support rotatif (non représenté) et l'outil 10 est appliqué contre la surface 71 avec une force suffisante pour que le tampon 13 épouse sa forme.To carry out a surfacing operation, the lens 72 to which the surface 71 belongs is mounted on a rotating support (not shown) and the tool 10 is applied against the surface 71 with a force sufficient for the pad 13 to conform to its shape.

L'outil 10 est ici, quant à lui, libre en rotation en étant toutefois décentré par rapport à la surface optique 71.The tool 10 is here, for its part, free to rotate while being however off-center with respect to the optical surface 71.

Le frottement relatif de la surface à travailler 71 et du tampon 13 suffit à entrainer en rotation l'outil 10 dans le même sens que la lentille 72, autour de l'axe X de symétrie.The relative friction of the working surface 71 and the buffer 13 is sufficient to rotate the tool 10 in the same direction as the lens 72, about the axis X of symmetry.

On arrose la surface optique 71 avec un fluide d'arrosage non abrasif ou abrasif, selon que le tampon 13 exerce ou non par lui-même cette fonction.The optical surface 71 is sprayed with a non-abrasive or abrasive watering fluid, depending on whether or not the pad 13 performs this function.

Afin de balayer la totalité de la surface optique 71, l'outil 10 est déplacé au cours du surfaçage selon une trajectoire radiale, le point d'intersection de l'axe X de l'outil 10 avec la surface optique 71 effectuant un mouvement de va-et-vient entre deux points de rebroussement.In order to scan the entire optical surface 71, the tool 10 is moved during the surfacing along a radial path, the point of intersection of the X axis of the tool 10 with the optical surface 71 making a movement. back and forth between two cusp points.

Au cours du surfaçage, le fait que la membrane 14 offre tout à la fois un maintien en tension du tampon 13 et un ceinturage de la périphérie de l'interface 12, permet à l'outil d'être particulièrement performant en matière de maintien du contact avec la surface 71 à travailler, y compris lorsque celle-ci présente de fortes variations d'altitude, par exemple s'il s'agit d'une face d'un verre de lunettes pour corriger la vision d'un porteur presbyte, myope et astigmate.During surfacing, the fact that the membrane 14 offers both a maintenance of tension of the buffer 13 and a surround of the periphery of the interface 12, allows the tool to be particularly effective in maintaining the contact with the surface 71 to work, including when it has large variations in altitude, for example if it is a side of a spectacle lens to correct the vision of a presbyopic wearer, myopic and astigmatic.

L'effet bénéfique procuré par le ceinturage de la portion périphérique de l'interface 12 par les bretelles 18, notamment en matière d'uniformité de la pression exercée sur la surface à travailler telle que 71, est renforcé par la présence de l'anneau déformable 16, qui procure lui aussi une certaine uniformisation des efforts du fait de son caractère continu.The beneficial effect provided by the belting of the peripheral portion of the interface 12 by the straps 18, in particular as regards the uniformity of the pressure exerted on the working surface such as 71, is reinforced by the presence of the ring deformable 16, which also provides some standardization efforts because of its continuous nature.

On notera que la présence de la collerette 61 est également favorable à la répartition uniforme de la pression exercée sur la surface à travailler.It will be noted that the presence of the flange 61 is also favorable to the uniform distribution of the pressure exerted on the surface to be worked.

La figure 5 illustre une variante de l'outil 10 dans laquelle les moyens d'attache permettant de mettre en prise les parties distales des bretelles 18 ne sont pas formés par le goujon 38 du noyau 20, mais par des tétons saillant de la semelle 61.The figure 5 illustrates a variant of the tool 10 in which the attachment means for engaging the distal portions of the straps 18 are not formed by the stud 38 of the core 20, but by projecting studs of the sole 61.

Dans cette variante, la galette 51 est remplacée par une galette 51' présentant dans une position intermédiaire entre le noyau 20 et l'anneau 16, un téton 55 à tête bombée, saillant du côté que l'on voit en haut sur la figure 3, c'est-à-dire à l'opposé de l'interface 12.In this variant, the wafer 51 is replaced by a wafer 51 'having in an intermediate position between the core 20 and the ring 16, a protruding nipple 55 protruding from the side that is seen at the top on the figure 3 , that is to say the opposite of the interface 12.

Dans cette variante, les bretelles 18 sont plus courtes afin qu'elles puissent opérer la mise en tension recherchée par engagement de leur ouverture 19 sur le téton 55 correspondant.In this variant, the straps 18 are shorter so that they can operate the desired tensioning by engagement of their opening 19 on the corresponding stud 55.

Ici, la galette 51' et le téton 55 sont faits en matière moulée d'une seule pièce, mais il est bien entendu possible de rapporter le téton 55 ou analogue par collage ou tout autre moyen de fixation.Here, the slab 51 'and the stud 55 are made of one-piece molded material, but it is of course possible to return the stud 55 or the like by gluing or any other fastening means.

Dans des variantes non représentées, les moyens d'attache des bretelles telles que 18, tout en restant au droit de la surface d'extrémité 26 de l'interface 12, sont différents du goujon 38 et des tétons 55, par exemple, au moins pour certaines bretelles, une portion de la broche sur laquelle est monté l'outil ; des tétons semblables aux tétons 55 répartis sur la périphérie d'un noyau tel que 20 ou d'un support rigide tel que 60 ; ou encore des moyens d'accrochage n'appartenant pas à un noyau ou support rigide, par exemple des crochets situés à des emplacements semblables à ceux des tétons 55.In variants not shown, the attachment means of the straps such as 18, while remaining at the right of the end surface 26 of the interface 12, are different from the stud 38 and pins 55, for example, at least for certain straps, a portion of the spindle on which the tool is mounted; nipples similar to the pins 55 distributed around the periphery of a core such as 20 or a rigid support such as 60; or else fastening means not belonging to a core or rigid support, for example hooks located at locations similar to those of the pins 55.

Dans l'outil 10, l'assujettissement entre l'ensemble formé par le tampon 13 et par la membrane 14 au reste de l'outil comporte le collage du plateau central 15 sur l'interface 12. Cela permet d'éviter que le plateau 15 puisse glisser par rapport à l'interface 12.In the tool 10, the securing between the assembly formed by the pad 13 and the membrane 14 to the rest of the tool comprises the bonding of the central plate 15 to the interface 12. This prevents the plate 15 can slide with respect to the interface 12.

En variante, dans des configurations où le risque de glissement est faible, l'assujettissement entre l'ensemble formé par le tampon tel que 13 et par la membrane telle que 14 se fait uniquement par les bretelles telles que 18.Alternatively, in configurations where the risk of slippage is low, the securing between the assembly formed by the pad such as 13 and the membrane such as 14 is only by the shoulder straps such as 18.

Il est également possible, dans certaines circonstances, d'opérer l'assujettissement du noyau tel que 20 ou du support rigide tel que 60 au reste de l'outil, uniquement par les bretelles telles que 18.It is also possible, in certain circumstances, to make the core such as 20 or the rigid support 60 such as the rest of the tool subject to the straps, such as 18.

Dans l'outil 10 illustré, le diamètre du tampon 13 est supérieur au diamètre du plateau 15. En variante, le diamètre du tampon 13 est différent, par exemple identique voire légèrement plus petit que le diamètre du plateau 15.In the illustrated tool 10, the diameter of the buffer 13 is greater than the diameter of the plate 15. In a variant, the diameter of the buffer 13 is different, for example identical or even slightly smaller than the diameter of the plate 15.

Dans l'outil 10 illustré, le tampon 13 est directement collé sur le plateau 15. En variante, une galette intermédiaire est interposée entre le tampon 13 et le plateau 15.In the tool 10 illustrated, the buffer 13 is directly glued to the plate 15. Alternatively, an intermediate wafer is interposed between the buffer 13 and the plate 15.

Dans une variante non représentée de l'outil 10, prévue pour travailler une surface à concavité plus prononcée que la surface 71, la surface d'extrémité telle que 40 ou 25a n'est pas plate mais convexe et/ou l'interface telle que 12 a une conformation initiale incurvée de façon correspondante tout en restant équi-épaisse.In a variant not shown of the tool 10, designed to work a concavity surface more pronounced than the surface 71, the end surface such as 40 or 25a is not flat but convex and / or the interface such as 12 has an initial conformation curved correspondingly while remaining equi-thick.

Dans d'autres variantes non représentées, la galette 51 a une épaisseur sensiblement différente de celle de la membrane 14 ; une galette supplémentaire, de plus petit diamètre que la galette 51 et de plus grand diamètre que le flasque 37, est interposée entre le flasque 37 et la galette 51 ; le support rigide 60 et la collerette 61 sont remplacés par un support rigide et une collerette agencés différemment, par exemple comme décrits dans la demande de brevet français 2 900 356 à laquelle correspond la demande internationale WO 2007/128894 ; et/ou il n'existe pas une telle collerette.In other variants not shown, the wafer 51 has a thickness substantially different from that of the membrane 14; an additional wafer, smaller in diameter than the wafer 51 and larger in diameter than the flange 37, is interposed between the flange 37 and the wafer 51; the rigid support 60 and the collar 61 are replaced by a rigid support and a collar arranged differently, for example as described in the French patent application 2,900,356 to which corresponds the international demand WO 2007/128894 ; and / or there is no such flange.

De nombreuses autres variantes sont possibles en fonction des circonstances et l'on rappelle à cet égard que l'invention ne se limite pas aux exemples décrits et représentés.Many other variants are possible depending on the circumstances and it is recalled in this regard that the invention is not limited to the examples described and shown.

Claims (10)

  1. Optical grade surfacing tool, including: a rigid support (60) having a transverse end surface (25a), an elastically compressible interface (12) attached to the rigid support (60), including a central part (12a) which is in line with said end surface (25a) of the rigid support (60) and a peripheral part (12b) that is transversely beyond said end surface (25a) of the rigid support (60), having a first transverse end surface (26), a second transverse end surface (27) and a lateral surface (28) extending from the periphery of the first end surface (26) to the periphery of the second end surface (27), said first end surface (26) being pressed against and covering said end surface (25a) of the rigid support (60); and a flexible pad (13) adapted to be pressed against a surface (71) to be worked, attached to the interface (12) on the opposite side to the rigid support (60), including a central part (13a) that is in line with said end surface (25a) of the rigid support and a peripheral part (13b) that is transversely beyond said end surface (25a) of the rigid support; characterized in that said pad (13) is carried by an elastically stretchy membrane (14), said membrane including:
    - a central plateau (15) having a first transverse end surface (22) to which said pad (13) is stuck and a second transverse end surface (23) pressed against and covering said second transverse end surface (27) of said interface (12); and
    - a plurality of straps (18) each projecting radially from the periphery of said plateau (15) and each having a distal part interengaged with an attachment means (38; 55) situated in line with the first end surface (26) of the interface (12), each of said straps (18) passing around said lateral surface (28) of the interface (12) and then extending as far as said attachment means, each said strap (18) being taut.
  2. Tool according to claim 1, characterized in that an opening (19) is formed in the distal part of each of said straps (18) in order to engage that distal part over a projecting element (38; 55) forming said attachment means.
  3. Tool according to claim 2, characterized in that said opening (19) is oblong.
  4. Tool according to either of claims 2 or 3, characterized in that said projecting element (38) is part of said rigid support (60).
  5. Tool according to either of claims 2 or 3, characterized in that said projecting element (55) is part of a flange (61) around said rigid support (60).
  6. Tool according to any of claims 1 to 5, characterized in that said central plateau (15) and said straps (18) of said membrane (14) are made in one piece.
  7. Tool according to any of claims 1 to 6, characterized in that the second end surface (23) of said central plateau (15) is stuck to said second end surface (27) of said interface (12).
  8. Tool according to any of claims 1 to 7, characterized in that it further includes a deformable ring (16) disposed between said peripheral part (12b) of the interface (12) and said straps (18).
  9. Tool according to any of claims 1 to 8, characterized in that said rigid support (60) is part of a base (11) including a flexible collar (61) around said support, said elastically compressible interface (12) being pressed against and covering an end surface (25b) of said collar (61) located on the same side as said end surface (25a).
  10. Tool according to claim 9, characterized in that said base (11) includes a rigid core (20) having a transverse end surface (40) and a flexible backing plate (21) pressed against and covering said end surface (40), said rigid support (60) being formed by said rigid core (20) and by a central part of said backing plate (21) located in line with said transverse end surface (40) of the core (20), said collar (61) being formed by a peripheral part (51b) of said backing plate (21) extending transversely beyond said end surface (40) of said rigid core (20).
EP09741349A 2008-09-10 2009-09-01 Optical-grade surfacing tool Active EP2337652B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0856075A FR2935627B1 (en) 2008-09-10 2008-09-10 SURFACE TOOL WITH OPTICAL QUALITY
PCT/FR2009/051651 WO2010029245A1 (en) 2008-09-10 2009-09-01 Optical-grade surfacing tool

Publications (2)

Publication Number Publication Date
EP2337652A1 EP2337652A1 (en) 2011-06-29
EP2337652B1 true EP2337652B1 (en) 2012-11-14

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EP09741349A Active EP2337652B1 (en) 2008-09-10 2009-09-01 Optical-grade surfacing tool

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US (1) US8475237B2 (en)
EP (1) EP2337652B1 (en)
CN (1) CN102123825B (en)
FR (1) FR2935627B1 (en)
WO (1) WO2010029245A1 (en)

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US20140150815A1 (en) * 2012-11-30 2014-06-05 Applied Materials, Inc. Disc-brush holder apparatus, disc-brush assembly, and substrate processing methods
BR112016008853B1 (en) 2013-10-25 2022-10-04 Essilor International OPTICAL QUALITY SURFING TOOL AND SURFING MACHINE
CN105643428A (en) * 2016-01-08 2016-06-08 湖南大学 Grinding and polishing method using revolving elastomer
CN105563300A (en) * 2016-01-08 2016-05-11 湖南大学 Rotary elastomer and grinding-polishing equipment
DE102016102223A1 (en) * 2016-02-09 2017-08-10 Lapmaster Wolters Gmbh Double or single side processing machine and method of operating a double or single side processing machine
EP3272458B1 (en) * 2016-07-21 2019-03-27 Delamare Sovra A method for manufacturing in series optical grade polishing tools
EP3272456B1 (en) * 2016-07-21 2019-03-13 Delamare Sovra A method for manufacturing in series optical grade polishing tools
PT3272457T (en) * 2016-07-21 2019-06-27 Delamare Sovra A method for manufacturing in series optical grade polishing tools
FR3059921B1 (en) 2016-12-09 2019-05-24 Essilor International SURFACE TOOL WITH OPTICAL QUALITY
CN107116750B (en) * 2017-04-01 2019-01-22 浙江工业职业技术学院 A kind of system of processing of taillight lampshade

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Publication number Priority date Publication date Assignee Title
US391581A (en) * 1888-10-23 James w
US610762A (en) * 1898-09-13 Buffing-pad
US6285506B1 (en) * 1999-01-21 2001-09-04 X-Ray Optical Systems, Inc. Curved optical device and method of fabrication
DE10144274A1 (en) * 2001-09-08 2003-03-27 Bosch Gmbh Robert sanding plate
FR2834662B1 (en) * 2002-01-16 2004-05-14 Essilor Int TOOL FOR SURFACING AN OPTICAL SURFACE
FR2857610B1 (en) * 2003-07-16 2006-03-17 Essilor Int TOOL FOR SURFACING AN OPTICAL SURFACE
FR2867558B1 (en) * 2004-03-11 2006-06-30 Sagem DEVICE FOR DETECTING THE TOPOGRAPHY OF AN OPTICAL SURFACE
DE602005004229T2 (en) * 2004-11-09 2009-01-02 Seiko Epson Corp. An elastic polishing tool and method of polishing a lens with such a tool
US7618306B2 (en) * 2005-09-22 2009-11-17 3M Innovative Properties Company Conformable abrasive articles and methods of making and using the same
FR2900356B1 (en) 2006-04-27 2008-07-18 Essilor Int TOOL FOR SURFACING AN OPTICAL SURFACE

Also Published As

Publication number Publication date
CN102123825A (en) 2011-07-13
FR2935627B1 (en) 2010-09-03
FR2935627A1 (en) 2010-03-12
CN102123825B (en) 2013-06-05
US8475237B2 (en) 2013-07-02
WO2010029245A1 (en) 2010-03-18
US20110136416A1 (en) 2011-06-09
EP2337652A1 (en) 2011-06-29

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