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EP2012969B1 - Optical surface surfacing tool - Google Patents

Optical surface surfacing tool Download PDF

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Publication number
EP2012969B1
EP2012969B1 EP07731314A EP07731314A EP2012969B1 EP 2012969 B1 EP2012969 B1 EP 2012969B1 EP 07731314 A EP07731314 A EP 07731314A EP 07731314 A EP07731314 A EP 07731314A EP 2012969 B1 EP2012969 B1 EP 2012969B1
Authority
EP
European Patent Office
Prior art keywords
end surface
tool according
tool
support
interface
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
EP07731314A
Other languages
German (de)
French (fr)
Other versions
EP2012969A1 (en
Inventor
Jean Stephane
Laurent Marcepoil
Patrick Herbin
Jean-Marc Padiou
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
Original Assignee
Essilor International Compagnie Generale dOptique SA
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=36829685&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2012969(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Essilor International Compagnie Generale dOptique SA filed Critical Essilor International Compagnie Generale dOptique SA
Priority to PL07731314T priority Critical patent/PL2012969T3/en
Publication of EP2012969A1 publication Critical patent/EP2012969A1/en
Application granted granted Critical
Publication of EP2012969B1 publication Critical patent/EP2012969B1/en
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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
    • B24B13/02—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
    • 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
    • B24D13/02—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S451/00—Abrading
    • Y10S451/921—Pad for lens shaping tool

Definitions

  • the invention relates to the surfacing of optical surfaces.
  • Surfacing means any operation to modify the surface condition of a previously shaped optical surface. These include polishing, grinding or etching operations to modify (decrease or increase) the roughness of the optical surface and / or to reduce the undulation.
  • a tool for surfacing an optical surface which comprises a rigid support having a transverse end surface, an elastically compressible interface which is applied against and covers said end surface, and a flexible pad adapted to be applied against the optical surface and which is applied against and at least partially covers the interface opposite and to the right of said end surface.
  • 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 makes it possible to compensate for the difference in curvature between the end surface of the tool support and the optical surface, so that the same tool is suitable for a range of surfaces. optical curvatures and different shapes.
  • the French patent application 2,834,662 proposes such a surfacing tool which, while being adapted to a range of optical surfaces sufficiently large, in terms of curvatures (convexity, concavity) and shapes (spherical, toric, aspherical, progressive or any combination thereof, or more generally "freeform"), has good stability during surfacing, and allows surfacing at once safe, fast and good quality.
  • a tool 1 for surfacing an optical surface 2 in this case one of the faces of an ophthalmic lens 3.
  • the optical surface 2 concerned is represented concave, but it could just as well be convex.
  • the tool 1 is formed of a stack of at least three parts, namely a rigid portion 4, an elastically compressible portion 5, and a flexible portion 6, which, in what follows, will be called respectively support, interface and buffer.
  • the support 4 comprises two jaws, namely a lower jaw 7 and an upper jaw 8 adapted to be superimposed by being nested one inside the other by means of a pin 9 projecting from one of the faces the upper jaw 8, fit to be housed in a complementary hole 11 arranged, facing, in a face 12 of the lower jaw 7.
  • the support 4 is generally cylindrical symmetry of revolution and has an axis of symmetry noted X, which defines a so-called longitudinal direction.
  • N is the normal to the optical surface 2 at the point of intersection of the axis of symmetry X of the tool 1 with the latter.
  • the lower jaw 7 has an end surface 13 extended substantially transversely, against which is applied, covering the interface 5.
  • the buffer 6 is applied against the interface 5 on the other side of the latter with respect to the support 4.
  • the pad 6 covers at least part of the interface 5 opposite and to the right of the end surface 13.
  • the friction of the pad 6 against the optical surface 2 will, by means of an abrasive contained in the watering fluid or incorporated in the pad 6 itself, to ensure a superficial removal of material on the optical surface 2 in order to to modify the surface state, as we will see later.
  • the pad has, on the one hand, a central portion 6a which is at the right of the end surface 13, and a peripheral portion 14 which is, transversely, beyond the end surface 13.
  • This peripheral portion 14 is connected to the support 4 by means 15 of elastic return.
  • the peripheral portion 14 extends in the extension of the central portion 6a while being, at rest, substantially coplanar with it.
  • the pad 6 is integral, the peripheral portion 14 being connected to the central portion 6a, so that they form in fact a single piece.
  • the tampon 6 is in the form of a flower, and thus comprises a plurality of petals 14b which protruding transversely from the central portion 6a, form the peripheral portion 14 of the pad 6 and each extend transversely beyond the end surface 13.
  • the peripheral portion 14 is in the form of a ring 14a which surrounds the central portion 6a.
  • the buffer 6 in the absence of stress, is, when it is monobloc, in the form of a disc of material whose thickness is low in front of its diameter, as shown on the figure 1 , the peripheral portion 14, 14a thus forming a flange with respect to the end surface 13.
  • the return means 15, which will be described later, can be interposed directly between the support 4 and the peripheral portion 14 of the buffer 6, that is to say, in practice, the flange 14a or the petals 14b.
  • the interface 5 comprises not only a central portion 5a which is at the right of the end surface 13, but also a peripheral portion 16 which is transversely beyond the end surface 13.
  • This peripheral portion 16 is in the extension of the central portion 5a, and is for example, in the absence of stress, in the form of a ring which surrounds the central portion 5a, and which is in fact interposed between the peripheral portion 14 of the buffer 6 and the return means 15.
  • the interface 5 is in one piece, its central parts 5a and peripheral 16 being in fact connected to form together a single piece, the peripheral portion 16 forming a flange with respect to the end surface 13.
  • the monoblock interface 5 is for example in the form of a disc of material whose thickness is small in front of its transverse dimension (that is to say, its diameter).
  • the interface 5 and the buffer 6 are both monobloc, they have comparable transverse dimensions.
  • they when they are each in the form of a disc of material, they will preferably be chosen, for constructive convenience, of the same diameter.
  • a pad of a diameter different from that of the interface in particular of greater diameter in order to mitigate the edge effects of the tool on the worked surface.
  • this ring 17 is fixed on the peripheral portion 16 on the other side thereof relative to the pad 6, that is to say on the same side as the support 4, and so that it it is surrounded by ring 17.
  • this ring 17 is of circular longitudinal section, but it could also be of more complex section, in particular oblong, polygonal, rectangular or square. Moreover, it is arranged on the peripheral part 16 concentrically with the support 4.
  • the return means 15 are now described.
  • These comprise at least one elastically flexible strip 18 which projects transversely from the support 4 and which is connected, on the one hand, rigidly to the support 4 by a first end 18a and, on the other hand, to the peripheral portion 14 of the buffer 6 by a second end 18b, said free end, opposite the first 18a.
  • the return means 15 comprise a plurality of such strips 18 distributed uniformly around the periphery of the support 4, to act on the entire peripheral portion 14 of the buffer 6.
  • the return means 15 are in fact in the form of a starry part 19 rigidly fixed to the support 4.
  • This star piece 19 comprises a central portion 20 from which a plurality of branches 18 project each forming an elastically flexible strip extending radially in a transverse plane.
  • the one-piece stamp 6 comprises a plurality of petals 14b, there are provided on the star piece 19 as many branches 18 as petals 14b, the star piece 19 being oriented so that each branch 18 extends to the right of a petal 14b.
  • the starry part 19 has, meanwhile, seven branches 18 each to ensure the elastic return of a petal 14b.
  • the ring 17 is attached to the interface 5, this attachment can be provided by any means, gluing being however preferred, especially for its simplicity.
  • the diameters of the interface 5, the buffer 6, the star part 19, have a value at least twice that of the diameter of the support 4.
  • the diameters of the interface 5 and the buffer 6 are chosen substantially equal to the diameter of the lens 3, so that the diameter of the support 4 is much smaller than the diameter. of the lens 3.
  • tool 1 is illustrated on the Figures 2 and 3 .
  • the lens 3 is mounted on a rotary support (not shown) by means of which it is driven in rotation about a fixed axis Y.
  • the tool 1 is applied against this face 2 with sufficient force so that the buffer 6 matches its shape.
  • the tool 1 is here, meanwhile, free in rotation yet being off-center with respect to the optical surface 2.
  • a drive forced rotation of the tool, by own means, however, can be provided.
  • the relative friction of the optical surface 2 and the buffer 6 is sufficient to rotate the tool 1 in the same direction as that of the lens 3, about an axis substantially coincident with the axis X of symmetry of the support 4.
  • the optical surface 2 is sprayed with a non-abrasive or abrasive watering fluid, depending on whether or not the pad performs this function.
  • the tool 1 In order to scan the entire optical surface 2, the tool 1 is moved during the surfacing along a radial trajectory, the point of intersection of the axis of rotation X of the tool 1 with the optical surface 2 effecting a plane. movement back and forth between two cusp points, namely an external cusp A and an internal cusp B both located at a distance from the axis of rotation Y of the lens 3.
  • the central portion 6a of the tampon 6 is deformed by conforming to the shape of the optical surface 2 thanks to the compressibility of the central portion 5a of the interface 5.
  • peripheral portion 14 of the tampon 6 deforms by conforming to the shape of the optical surface 2 thanks to the deformation of the flexible strips 18.
  • peripheral portions 14 of the buffer 6 and 16 of the interface 5 they essentially have a stabilizing role, on the one hand thanks to the increase in the lift or seating of the tool 1 compared to a conventional tool whose buffer and the interface would be limited to the central portions 5a, 6a and, secondly, thanks to the return means 15 which maintain a permanent contact between the peripheral portion 14 of the buffer 6 and the optical surface 2.
  • the deformable ring 17 allows a smoothing of the stress distribution exerted on the peripheral periphery of the interface 5 and hence on the pad 6 by the strips 18.
  • the end surface 13 of the support 4 is flat.
  • the tool 1 is thus adapted to surface a certain range of optical surfaces 2 of different curvatures.
  • the tool 1 When, at rest, the lamellae 18 are straight or bent opposite the end surface 13, the tool 1 is intended for the concave optical surfaces 2, whereas when the slats 18 are bent on the side of the end surface 13, the tool 1 is intended for 2 convex optical surfaces.
  • the end surface 13 of the support 4 is convex, the tool 1 thus being intended for optical surfaces 2 having a more pronounced concavity.
  • the end surface 13 of the support 4 is concave, the tool 1 thus being intended for optical surfaces 2 to more pronounced convexity.
  • the French patent application 2,857,610 which corresponds to the international demand WO 2005/007340 , proposes that the elastic return means, rather than being in the form of a star-shaped piece such as the piece 19 illustrated on the figures 1 and 2 , has a continuous peripheral part cooperating in support with the peripheral part of the buffer such as the buffer 6, directly or via the only interface such as the interface 5 (no deformable ring such as 17 is provided), the elastic return means comprising, in addition to the continuous peripheral portion, a flat or curved collar rigidly fixed on the inner side to the support such as the support 4, this collar being formed by a perforated or solid wall.
  • the invention relates to a surfacing tool of the same kind, but in which the smoothness of the surfacing is further improved as well as its qualities of simplicity, convenience and economy.
  • the contact surface between the interface and the rest of the tool is particularly important, which ensures a uniform distribution of the pressure exerted on the surface to be worked.
  • the tool according to the invention therefore makes it possible to perform surfacing with a high quality of appearance.
  • this larger contact surface facilitates the subjection of the interface with the rigid support, especially by gluing.
  • the support 104 belongs to a base 130 which has a flexible peripheral portion 131 located transversely beyond the rigid support 104, which is centrally disposed.
  • the peripheral portion 131 generally forms a flexible collar having an outer diameter (large diameter) similar to the outer diameter of the interface 105 and the buffer 106.
  • the inner diameter (small diameter) of the flexible collar 131 corresponds to the external diameter of the support 104, the flange 131 projecting from the lateral wall of the support 104.
  • the support 104 and the flexible peripheral collar 131 are made of one-piece molded plastic, the support 104 being solid at least in the vicinity of the surface 113 to have the required rigidity while the flange 131 is thin wall thickness to be flexible.
  • the flange 131 has twelve slots 133 oriented radially and equiangularly distributed, so that the flange 131 is subdivided into twelve petals 134 each generally formed as an angular sector trunk.
  • the end surface 113 of the support 104 is flush with the surface 132 of the flange 131 on the same side.
  • the support 104 and the collar 131 are made in one piece makes it possible to reduce the effects of marking the edge of the end surface 113 on the surface to be worked, so that the tool 101 makes it possible to perform surfacing with a high quality of appearance.
  • the support 104 has the outer contour of a cap with a proximal portion 137 which has an outer diameter smaller than the distal portion 136 to which the end surface 113 and the shoulder 135 belong.
  • the proximal portion 137 serves to connect the support 104, and more generally the base 130, on the one hand, to the elastic return means 115, here formed by the star piece 119, and, on the other hand, to the pin of the surfacing machine allowing the tool 101 to cooperate with an optical surface such as 2 in the manner explained above in support of Figures 2 and 3 .
  • the proximal portion 137 has an annular recess 138 opening on the opposite side to the end surface 113 and extending axially in the portion 137 to near the portion 136.
  • the inner side surface of the recess 138 defines an annular drum 139 for receiving the spindle head of a surfacing machine.
  • the drum 139 has a cavity 140 for receiving the spindle head.
  • the cavity 140 has a spherical portion 141 generally formed as three quarters of a sphere, an annular rib 142 and a frustoconical portion 143, the annular rib 142 being disposed between the portions 141 and 143.
  • the spindle head intended to be accommodated in the cavity 140 has a spherical portion end shaped as the portion 141 and a cylindrical portion of smaller diameter than the rib 142.
  • the assembly between the drum 139 and the spindle of the machine is done by simple snapping, the wall thickness of the drum 139 being sufficiently small, thanks to the recess 138, to be able to deform so that the spherical portion of the spindle head is lodged in portion 141.
  • the tool 101 When the spindle head is engaged in the cavity 140, the tool 101 co-operates in a ball joint relation to the spindle.
  • the center of the spherical portion 141 is particularly close to the end surface 113, which allows the tool 101 to orient itself optimally with respect to the surface such as 2 with which the tool 101 must cooperate.
  • An annular shaft 144 is delimited by the side wall of the proximal portion 137 and the outer lateral wall of the recess 138.
  • a groove 147 for receiving a rib 148 of the star piece 119 forming the elastic return means 115.
  • the annular barrel 144 can be deformed to allow the rib 144 to fit into the groove 147 by virtue of the fact that the wall thickness of the barrel 137 is relatively small and the annular recess 138 provides the required deflection.
  • the rib 148 of the star piece 119 protrudes into the bore of the central part 120 of this part, this bore having a diameter corresponding to that of the lateral surface of the distal portion 137 of the support 104.
  • the branches 118 of the star piece 119 are each angularly centered with respect to a respective petal 134 of the flange 131, but this relative positioning may be different.
  • Each of the branches 118 of the piece 119 has near its free end and the side facing the base 130, a step 145 which has, on the external side, a surface 146 shaped toroidal portion centered on the central axis of the piece 119, and therefore more generally of the tool 101.
  • the surfaces 146 of the different steps 145 are in correspondence of each other and with the external surface of the deformable ring 117.
  • the ring 117 when in place, is sandwiched between the elastic return means 115 (star part 119) and the flexible collar 131.
  • the diameter of the interface 105 and the buffer 106 corresponds to the external diameter of the flange 131.
  • the securing between the interface 105 and the base 130 is performed by a double-sided adhesive 150 disposed between the interface 105 and the surfaces 113 and 132 of the base 130.
  • the elastically compressible interface 105 is a foam having a thickness of the order of 9 mm with a glossy skin which is located on the side of the pad 106.
  • connection between the elastically compressible interface 105 and the flexible pad 106 is done through a layer 152 of sizing putty, here a layer of 0.5 mm thick.
  • the flexible pad 106 has a thickness of the order of 1 mm and the double-sided adhesive 150 has a thickness of the order of 0.32 mm.
  • the diameter of the interface 105 and the buffer 106 is of the order of 55 mm.
  • the star part 119 and the base 130 are each made of plastic molded in one piece by injection.
  • the base 130 which must both be rigid in the vicinity of the end surface 113 and flexible at the collar 131 and the annular barrels 139 and 141 to allow the snaps, while offering good wear resistance for cooperation with the spindle head, is made of polypropylene (PP) or high density polyethylene (eg HDPE 1000).
  • PP polypropylene
  • HDPE 1000 high density polyethylene
  • the star piece 119 is preferably polyoxymethylene (POM), see polyamide (PA) in order to have a modulus of elasticity of between 1500 and 4000 N / mm 2 .
  • POM polyoxymethylene
  • PA polyamide
  • the star piece 119 and the base 130 are preferably made of different materials, since they must respond to different physical constraints, the star piece forming the elastic return means having good elastic return characteristics while the base must have good wear resistance for cooperation with the spindle head and must allow easy bonding with the interface 105.
  • the deformable ring 117 is a simple commercial O-ring, for example Nitrile.
  • the end surface 113 of the support 104 is shaped like a sphere portion having a radius of curvature of the order of 70 mm.
  • the surface 132 of the flange 131 which, as indicated above, is flush with the surface 113, is shaped as a truncated cone whose small diameter corresponds to the largest diameter of the surface 113, the inclination (angle at the apex) of the surface 131 being given by the tangent to the surface 113 at the junction zone with the surface 132 .
  • the contact surface between the interface 105 and the rest of the tool, in this case the base 130, is particularly important since it is formed both by the surface 113 and by the surface 132.
  • the base 130 ' is arranged as the base 130 but the radius of curvature R of the end surface 113' is much smaller, of the order of 30 mm.
  • the tool that includes the base 130 ' is particularly suitable for very heavily arched surfaces.
  • the bases 130 "and 130" ' are arranged as the base 130 or the base 130' but their flanges, respectively 131 "and 131" ', have eight petals 134 "and 134"' respectively these petals being delimited by slots 133 "and 133" ', respectively, which are not oriented radially.
  • the slots 133 are curved while the slots 133" 'are straight but arranged in directions that are not radial.
  • the base of the tool according to the invention comprises a number of petals different from eight or twelve, for example six or sixteen and the slits defining the petals have different shapes, for example with ripples.
  • the collar 131 is replaced by a flexible collar, but not subdivided into petals.
  • the support 104 is shaped differently, for example in two parts forming jaws as in the previous tool illustrated on the Figures 1 to 3 .
  • the elements other than the base are arranged differently, for example as illustrated in FIGS. Figures 1 to 3 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Eyeglasses (AREA)
  • Pens And Brushes (AREA)
  • Adornments (AREA)
  • Physical Vapour Deposition (AREA)

Abstract

This tool includes: a rigid support (104) having a transverse end surface (113); an elastically compressible interface that is pressed against and covers the end surface; a flexible pad adapted to be pressed against the optical surface, itself pressed against and covering the interface on the opposite side of and in line with the end surface (113); spring return element (115) connecting the support (104) to a peripheral portion of the flexible pad situated transversely beyond the end surface (113); and a flexible flange (131) that is part of a base (130) to which the rigid support (104), which is surrounded by the flange (131), also belongs.

Description

DOMAINE DE L'INVENTIONFIELD OF THE INVENTION

L'invention a trait au surfaçage des surfaces optiques.The invention relates to the surfacing of optical surfaces.

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

ARRIERE-PLAN TECHNOLOGIQUEBACKGROUND

On connaît déjà un outil de surfaçage d'une surface optique, qui comporte un support rigide présentant une surface transversale d'extrémité, une interface élastiquement compressible qui est appliquée contre et recouvre ladite surface d'extrémité, ainsi qu'un tampon souple apte à être appliqué contre la surface optique et qui est appliqué contre et recouvre au moins en partie l'interface à l'opposé et au droit de ladite surface d'extrémité.A tool for surfacing an optical surface is already known, which comprises a rigid support having a transverse end surface, an elastically compressible interface which is applied against and covers said end surface, and a flexible pad adapted to be applied against the optical surface and which is applied against and at least partially covers the interface opposite and to the right of said end surface.

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, de sorte qu'un même outil est adapté à une gamme de surfaces optiques de courbures et de formes différentes.During surfacing, the elastically compressible interface makes it possible to compensate for the difference in curvature between the end surface of the tool support and the optical surface, so that the same tool is suitable for a range of surfaces. optical curvatures and different shapes.

La demande de brevet français 2 834 662 , à laquelle correspond la demande de brevet américain 2005/0101235 , propose un tel outil de surfaçage qui, tout en étant adapté à une gamme de surfaces optiques suffisamment vaste, en termes de courbures (convexité, concavité) et de formes (sphériques, toriques, asphériques, progressives ou toute combinaison de celles-ci, ou plus généralement "freeform"), présente une bonne stabilité lors du surfaçage, et permet un surfaçage à la fois sûr, rapide et de bonne qualité.The French patent application 2,834,662 , to which corresponds the US patent application 2005/0101235 , proposes such a surfacing tool which, while being adapted to a range of optical surfaces sufficiently large, in terms of curvatures (convexity, concavity) and shapes (spherical, toric, aspherical, progressive or any combination thereof, or more generally "freeform"), has good stability during surfacing, and allows surfacing at once safe, fast and good quality.

Un exemple de réalisation de l'outil proposé par ce document est décrit ci-après à l'àppui des figures 1 à 3 des dessins annexés, sur lesquels :

  • la figure 1 est une vue en perspective éclatée de cet outil et d'une lentille ophtalmique présentant une surface optique à surfacer ;
  • la figure 2 est une vue en coupe de cet outil représenté assemblé, au cours du surfaçage de la surface optique de la lentille de la figure 1 ; et
  • la figure 3 est une vue schématique de dessus représentant cette lentille ophtalmique en cours de surfaçage au moyen de cet outil, lequel est représenté au cours du balayage de la surface optique dans deux positions dont l'une est illustrée en trait interrompu.
An exemplary embodiment of the tool proposed by this document is described below with the help of Figures 1 to 3 annexed drawings, in which:
  • the figure 1 is an exploded perspective view of this tool and an ophthalmic lens having an optical surface to be surfaced;
  • the figure 2 is a sectional view of this tool shown assembled, during the surfacing of the optical surface of the lens of the figure 1 ; and
  • the figure 3 is a schematic top view showing this ophthalmic lens being surfaced by means of this tool, which is represented during scanning of the optical surface in two positions, one of which is illustrated in broken lines.

Sur la figure 1 est représenté un outil 1 pour le surfaçage d'une surface optique 2, en l'occurrence l'une des faces d'une lentille ophtalmique 3. Sur la figure 1, de même que sur la figure 2, la surface optique 2 concernée est représentée concave, mais elle pourrait tout aussi bien être convexe.On the figure 1 is shown a tool 1 for surfacing an optical surface 2, in this case one of the faces of an ophthalmic lens 3. On the figure 1 , as well as on the figure 2 , the optical surface 2 concerned is represented concave, but it could just as well be convex.

L'outil 1 est formé d'un empilement d'au moins trois parties, à savoir une partie rigide 4, une partie élastiquement compressible 5, et une partie souple 6, qui, dans ce qui va suivre, seront appelées respectivement support, interface et tampon.The tool 1 is formed of a stack of at least three parts, namely a rigid portion 4, an elastically compressible portion 5, and a flexible portion 6, which, in what follows, will be called respectively support, interface and buffer.

Tel qu'il apparaît notamment sur la figure 1, le support 4 comporte deux mors, à savoir un mors inférieur 7 et un mors supérieur 8 adaptés à être superposés en étant emboîtés l'un dans l'autre par l'intermédiaire d'un pion 9 saillant de l'une 10 des faces du mors supérieur 8, propre à venir se loger dans un trou 11 complémentaire ménagé, en regard, dans une face 12 du mors inférieur 7.As it appears in particular on the figure 1 the support 4 comprises two jaws, namely a lower jaw 7 and an upper jaw 8 adapted to be superimposed by being nested one inside the other by means of a pin 9 projecting from one of the faces the upper jaw 8, fit to be housed in a complementary hole 11 arranged, facing, in a face 12 of the lower jaw 7.

Comme on peut le voir sur la figure 1, le support 4 est globalement cylindrique à symétrie de révolution et présente un axe de symétrie noté X, qui définit une direction dite longitudinale.As can be seen on the figure 1 , the support 4 is generally cylindrical symmetry of revolution and has an axis of symmetry noted X, which defines a so-called longitudinal direction.

L'on note n la normale à la surface optique 2 au point d'intersection de l'axe de symétrie X de l'outil 1 avec cette dernière. N is the normal to the optical surface 2 at the point of intersection of the axis of symmetry X of the tool 1 with the latter.

A l'opposé de sa face 12 dans laquelle est pratiqué le trou 11, le mors inférieur 7 présente une surface d'extrémité 13 étendue sensiblement transversalement, contre laquelle est appliquée, en la recouvrant, l'interface 5.Opposite its face 12 in which the hole 11 is made, the lower jaw 7 has an end surface 13 extended substantially transversely, against which is applied, covering the interface 5.

Le tampon 6 est quant à lui appliqué contre l'interface 5 de l'autre côté de celle-ci par rapport au support 4.The buffer 6 is applied against the interface 5 on the other side of the latter with respect to the support 4.

Plus précisément, le tampon 6 recouvre au moins en partie l'interface 5 à l'opposé et au droit de la surface d'extrémité 13.More specifically, the pad 6 covers at least part of the interface 5 opposite and to the right of the end surface 13.

Le frottement du tampon 6 contre la surface optique 2 permettra, au moyen d'un abrasif contenu dans le fluide d'arrosage ou incorporé dans le tampon 6 lui-même, d'assurer un enlèvement superficiel de matière sur la surface optique 2 en vue de modifier l'état de surface, comme nous le verrons par la suite.The friction of the pad 6 against the optical surface 2 will, by means of an abrasive contained in the watering fluid or incorporated in the pad 6 itself, to ensure a superficial removal of material on the optical surface 2 in order to to modify the surface state, as we will see later.

Le tampon comporte, d'une part une partie centrale 6a qui se trouve au droit de la surface d'extrémité 13, et une partie périphérique 14 qui se trouve, transversalement, au-delà de la surface d'extrémité 13.The pad has, on the one hand, a central portion 6a which is at the right of the end surface 13, and a peripheral portion 14 which is, transversely, beyond the end surface 13.

Cette partie périphérique 14 est raccordée au support 4 par l'intermédiaire de moyens 15 de rappel élastique.This peripheral portion 14 is connected to the support 4 by means 15 of elastic return.

La partie périphérique 14 s'étend dans le prolongement de la partie centrale 6a en étant, au repos, sensiblement coplanaire avec elle.The peripheral portion 14 extends in the extension of the central portion 6a while being, at rest, substantially coplanar with it.

Dans l'exemple illustré sur les figures 1 et 2, le tampon 6 est monobloc, la partie périphérique 14 étant raccordée à la partie centrale 6a, de sorte qu'elles ne forment en fait qu'une seule et même pièce.In the example shown on the figures 1 and 2 , the pad 6 is integral, the peripheral portion 14 being connected to the central portion 6a, so that they form in fact a single piece.

Suivant un mode de réalisation représenté en trait fort sur la figure 1, le tampon 6 se présente sous la forme d'une fleur, et comporte ainsi une pluralité de pétales 14b qui, saillant transversalement de la partie centrale 6a, forment la partie périphérique 14 du tampon 6 et s'étendent chacun transversalement au-delà de la surface d'extrémité 13.According to an embodiment shown in strong lines on the figure 1 , the tampon 6 is in the form of a flower, and thus comprises a plurality of petals 14b which protruding transversely from the central portion 6a, form the peripheral portion 14 of the pad 6 and each extend transversely beyond the end surface 13.

Suivant une variante représentée en trait mixte sur la figure 1, la partie périphérique 14 se présente sous la forme d'une couronne 14a qui entoure la partie centrale 6a.According to a variant shown in phantom on the figure 1 , the peripheral portion 14 is in the form of a ring 14a which surrounds the central portion 6a.

Dans ce cas, en l'absence de contrainte, le tampon 6 se présente, lorsqu'il est monobloc, sous la forme d'un disque de matière dont l'épaisseur est faible devant son diamètre, tel que représenté sur la figure 1, la partie périphérique 14, 14a formant ainsi une collerette par rapport à la surface d'extrémité 13.In this case, in the absence of stress, the buffer 6 is, when it is monobloc, in the form of a disc of material whose thickness is low in front of its diameter, as shown on the figure 1 , the peripheral portion 14, 14a thus forming a flange with respect to the end surface 13.

Les moyens de rappel 15, qui seront décrits ultérieurement, peuvent être interposés directement entre le support 4 et la partie périphérique 14 du tampon 6, c'est-à-dire, en pratique, la collerette 14a ou les pétales 14b.The return means 15, which will be described later, can be interposed directly between the support 4 and the peripheral portion 14 of the buffer 6, that is to say, in practice, the flange 14a or the petals 14b.

L'interface 5 comporte non seulement une partie centrale 5a qui se trouve au droit de la surface d'extrémité 13, mais également une partie périphérique 16 qui se trouve transversalement au-delà de la surface d'extrémité 13.The interface 5 comprises not only a central portion 5a which is at the right of the end surface 13, but also a peripheral portion 16 which is transversely beyond the end surface 13.

Cette partie périphérique 16 se trouve dans le prolongement de la partie centrale 5a, et se présente par exemple, en l'absence de contrainte, sous la forme d'une couronne qui entoure la partie centrale 5a, et qui est en fait interposée entre la partie périphérique 14 du tampon 6 et les moyens de rappel 15.This peripheral portion 16 is in the extension of the central portion 5a, and is for example, in the absence of stress, in the form of a ring which surrounds the central portion 5a, and which is in fact interposed between the peripheral portion 14 of the buffer 6 and the return means 15.

Tel qu'il apparaît sur les figures 1 et 2, l'interface 5 est monobloc, ses parties centrale 5a et périphérique 16 étant en fait raccordées pour former ensemble une seule et même pièce, la partie périphérique 16 formant une collerette par rapport à la surface d'extrémité 13.As it appears on the figures 1 and 2 , the interface 5 is in one piece, its central parts 5a and peripheral 16 being in fact connected to form together a single piece, the peripheral portion 16 forming a flange with respect to the end surface 13.

Ainsi, en l'absence de contrainte, l'interface 5 monobloc se présente par exemple sous la forme d'un disque de matière dont l'épaisseur est faible devant sa dimension transversale (c'est-à-dire son diamètre).Thus, in the absence of stress, the monoblock interface 5 is for example in the form of a disc of material whose thickness is small in front of its transverse dimension (that is to say, its diameter).

Lorsque l'interface 5 et le tampon 6 sont tous deux monoblocs, ils présentent des dimensions transversales comparables. En particulier, lorsqu'ils se présentent chacun sous la forme d'un disque de matière, on les choisira de préférence, par commodité constructive, de même diamètre. Mais on pourra également prévoir d'utiliser un tampon de diamètre différent de celui de l'interface, en particulier de diamètre supérieur afin d'atténuer les effets de bord de l'outil sur la surface travaillée.When the interface 5 and the buffer 6 are both monobloc, they have comparable transverse dimensions. In particular, when they are each in the form of a disc of material, they will preferably be chosen, for constructive convenience, of the same diameter. However, it will also be possible to use a pad of a diameter different from that of the interface, in particular of greater diameter in order to mitigate the edge effects of the tool on the worked surface.

En outre, pour des raisons qui apparaîtront par la suite, il est prévu, un anneau déformable 17 interposé entre la partie périphérique 16 de l'interface 5 et les moyens de rappel 15.In addition, for reasons which will appear subsequently, there is provided a deformable ring 17 interposed between the peripheral portion 16 of the interface 5 and the return means 15.

En pratique, cet anneau 17 est fixé sur la partie périphérique 16 de l'autre côté de celle-ci par rapport au tampon 6, c'est-à-dire du même côté que le support 4, et de telle sorte que celui-ci est entouré par l'anneau 17.In practice, this ring 17 is fixed on the peripheral portion 16 on the other side thereof relative to the pad 6, that is to say on the same side as the support 4, and so that it it is surrounded by ring 17.

De préférence, cet anneau 17 est à section longitudinale circulaire, mais il pourrait également être à section de forme plus complexe, notamment oblongue, polygonale, rectangulaire ou carrée. Par ailleurs, il est disposé sur la partie périphérique 16 de manière concentrique avec le support 4.Preferably, this ring 17 is of circular longitudinal section, but it could also be of more complex section, in particular oblong, polygonal, rectangular or square. Moreover, it is arranged on the peripheral part 16 concentrically with the support 4.

L'on décrit à présent les moyens de rappel 15.The return means 15 are now described.

Ceux-ci comprennent au moins une lamelle élastiquement flexible 18 qui saille transversalement du support 4 et qui est raccordée, d'une part, rigidement, au support 4 par une première extrémité 18a et, d'autre part, à la partie périphérique 14 du tampon 6 par une deuxième extrémité 18b, dite extrémité libre, opposée à la première 18a.These comprise at least one elastically flexible strip 18 which projects transversely from the support 4 and which is connected, on the one hand, rigidly to the support 4 by a first end 18a and, on the other hand, to the peripheral portion 14 of the buffer 6 by a second end 18b, said free end, opposite the first 18a.

De la sorte, sous l'effet d'une force exercée longitudinalement sur la partie périphérique 14 au droit de cette lamelle 18, celle-ci se déforme en exerçant sur la partie périphérique 14 une réaction opposée à ladite force.In this way, under the effect of a force exerted longitudinally on the peripheral portion 14 to the right of the plate 18, the latter is deformed by exerting on the peripheral portion 14 a reaction opposite to said force.

En pratique, les moyens de rappel 15 comportent une pluralité de telles lamelles 18, réparties de manière uniforme à la périphérie du support 4, pour agir sur la totalité de la partie périphérique 14 du tampon 6.In practice, the return means 15 comprise a plurality of such strips 18 distributed uniformly around the periphery of the support 4, to act on the entire peripheral portion 14 of the buffer 6.

Les moyens de rappel 15 se présentent en fait sous la forme d'une pièce étoilée 19 rigidement fixée au support 4.The return means 15 are in fact in the form of a starry part 19 rigidly fixed to the support 4.

Cette pièce étoilée 19 comporte une partie centrale 20 dont saillent une pluralité de branches 18 formant chacune une lamelle élastiquement flexible étendue radialement dans un plan transversal.This star piece 19 comprises a central portion 20 from which a plurality of branches 18 project each forming an elastically flexible strip extending radially in a transverse plane.

Pour la fixation de la pièce étoilée 19 au support 4, sa partie centrale 20 est, en pratique, pincée entre les mors 7, 8 du support 4, son centrage étant assuré au moyen d'un trou 21 traversant pratiqué en son centre, traversé par le pion 9 du mors supérieur 8, l'ensemble étant maintenu à l'aide de moyens de fixation telles que des vis qui, traversant le mors supérieur 8 et la partie centrale 20 de la pièce étoilée 19, viennent se prendre dans le mors inférieur 7.For fixing the star piece 19 to the support 4, its central portion 20 is, in practice, pinched between the jaws 7, 8 of the support 4, its centering being provided by means of a through hole 21 made in its center, crossed by the pin 9 of the upper jaw 8, the assembly being held by means of fastening means such as screws which, passing through the upper jaw 8 and the central portion 20 of the star piece 19, are caught in the jaw lower 7.

Lorsque, conformément à un mode de réalisation précédemment décrit, le tampon 6 monobloc comporte une pluralité de pétales 14b, il est prévu sur la pièce étoilée 19 autant de branches 18 que de pétales 14b, la pièce étoilée 19 étant orientée pour que chaque branche 18 s'étende au droit d'un pétale 14b. Ainsi, lorsque le tampon 6 comporte sept pétales 14b, la pièce étoilée 19 comporte, quant à elle, sept branches 18 propres à assurer chacune le rappel élastique d'un pétale 14b.When, in accordance with an embodiment previously described, the one-piece stamp 6 comprises a plurality of petals 14b, there are provided on the star piece 19 as many branches 18 as petals 14b, the star piece 19 being oriented so that each branch 18 extends to the right of a petal 14b. Thus, when the stamp 6 has seven petals 14b, the starry part 19 has, meanwhile, seven branches 18 each to ensure the elastic return of a petal 14b.

L'anneau 17 est fixé à l'interface 5, cette fixation pouvant être assurée par tout moyen, le collage étant toutefois préféré, notamment pour sa simplicité.The ring 17 is attached to the interface 5, this attachment can be provided by any means, gluing being however preferred, especially for its simplicity.

Dans le mode de réalisation représenté, les diamètres de l'interface 5, du tampon 6, de la pièce étoilée 19, ont une valeur au moins double de celle du diamètre du support 4.In the embodiment shown, the diameters of the interface 5, the buffer 6, the star part 19, have a value at least twice that of the diameter of the support 4.

Par ailleurs, lorsqu'il s'agit de surfacer une lentille ophtalmique, les diamètres de l'interface 5 et du tampon 6 sont choisis sensiblement égaux au diamètre de la lentille 3, de sorte que le diamètre du support 4 est bien inférieur au diamètre de la lentille 3.Moreover, when it comes to surfacing an ophthalmic lens, the diameters of the interface 5 and the buffer 6 are chosen substantially equal to the diameter of the lens 3, so that the diameter of the support 4 is much smaller than the diameter. of the lens 3.

L'utilisation de l'outil 1 est illustrée sur les figures 2 et 3.The use of tool 1 is illustrated on the Figures 2 and 3 .

Il s'agit en l'occurrence du surfaçage ou du doucissage d'une face convexe 2 asphérique d'une lentille ophtalmique.This is in the case of surfacing or smoothing of a convex face 2 aspheric of an ophthalmic lens.

La lentille 3 est montée sur un support rotatif (non représenté) au moyen duquel elle est entraînée en rotation autour d'un axe fixe Y.The lens 3 is mounted on a rotary support (not shown) by means of which it is driven in rotation about a fixed axis Y.

L'outil 1 est appliqué contre cette face 2 avec une force suffisante pour que le tampon 6 épouse sa forme. L'outil 1 est ici, quant à lui, libre en rotation en étant toutefois décentré par rapport à la surface optique 2. Un entraînement forcé en rotation de l'outil, par des moyens propres, peut toutefois être prévu.The tool 1 is applied against this face 2 with sufficient force so that the buffer 6 matches its shape. The tool 1 is here, meanwhile, free in rotation yet being off-center with respect to the optical surface 2. A drive forced rotation of the tool, by own means, however, can be provided.

Le frottement relatif de la surface optique 2 et du tampon 6 suffit à entraîner en rotation l'outil 1 dans le même sens que celui de la lentille 3, autour d'un axe sensiblement confondu avec l'axe X de symétrie du support 4.The relative friction of the optical surface 2 and the buffer 6 is sufficient to rotate the tool 1 in the same direction as that of the lens 3, about an axis substantially coincident with the axis X of symmetry of the support 4.

L'on arrose la surface optique 2 avec un fluide d'arrosage non abrasif ou abrasif, selon que le tampon exerce ou non par lui-même cette fonction.The optical surface 2 is sprayed with a non-abrasive or abrasive watering fluid, depending on whether or not the pad performs this function.

Afin de balayer la totalité de la surface optique 2, l'outil 1 est déplacé au cours du surfaçage suivant une trajectoire radiale, le point d'intersection de l'axe de rotation X de l'outil 1 avec la surface optique 2 effectuant un mouvement de va et vient entre deux points de rebroussement, à savoir un point de rebroussement extérieur A et un point de rebroussement intérieur B situés tous deux à distance de l'axe de rotation Y de la lentille 3.In order to scan the entire optical surface 2, the tool 1 is moved during the surfacing along a radial trajectory, the point of intersection of the axis of rotation X of the tool 1 with the optical surface 2 effecting a plane. movement back and forth between two cusp points, namely an external cusp A and an internal cusp B both located at a distance from the axis of rotation Y of the lens 3.

La partie centrale 6a du tampon 6 se déforme en épousant la forme de la surface optique 2 grâce à la compressibilité de la partie centrale 5a de l'interface 5.The central portion 6a of the tampon 6 is deformed by conforming to the shape of the optical surface 2 thanks to the compressibility of the central portion 5a of the interface 5.

Quant à la partie périphérique 14 du tampon 6, elle se déforme en épousant la forme de la surface optique 2 grâce à la déformation des lamelles flexibles 18.As for the peripheral portion 14 of the tampon 6, it deforms by conforming to the shape of the optical surface 2 thanks to the deformation of the flexible strips 18.

Compte tenu de la rigidité du support 4, l'enlèvement de matière a lieu en majorité au droit de la surface d'extrémité 13, c'est-à-dire que cet enlèvement de matière est effectué essentiellement par la partie centrale 6a du tampon 6.Given the rigidity of the support 4, the removal of material takes place in majority right of the end surface 13, that is to say that this removal of material is carried out essentially by the central portion 6a of the buffer 6.

Quant aux parties périphériques 14 du tampon 6 et 16 de l'interface 5, elles ont essentiellement un rôle stabilisateur, d'une part grâce à l'accroissement de la portance ou assise de l'outil 1 par rapport à un outil classique dont le tampon et l'interface seraient limités aux parties centrales 5a, 6a et, d'autre part, grâce aux moyens de rappel 15 qui maintiennent un contact permanent entre la partie périphérique 14 du tampon 6 et la surface optique 2.As for the peripheral portions 14 of the buffer 6 and 16 of the interface 5, they essentially have a stabilizing role, on the one hand thanks to the increase in the lift or seating of the tool 1 compared to a conventional tool whose buffer and the interface would be limited to the central portions 5a, 6a and, secondly, thanks to the return means 15 which maintain a permanent contact between the peripheral portion 14 of the buffer 6 and the optical surface 2.

L'anneau déformable 17 permet un lissage de la distribution de contrainte exercée sur le pourtour périphérique de l'interface 5 et, partant, sur le tampon 6 par les lamelles 18.The deformable ring 17 allows a smoothing of the stress distribution exerted on the peripheral periphery of the interface 5 and hence on the pad 6 by the strips 18.

Il en résulte que, quelle que soit la localisation de l'outil 1 sur la surface optique 2 et quelle que soit sa vitesse de rotation, son axe de rotation X est en permanence colinéaire ou sensiblement colinéaire à la normale n à la surface optique 2, l'orientation de l'outil 1 étant ainsi optimale à tout instant.As a result, regardless of the location of the tool 1 on the optical surface 2 and irrespective of its rotational speed, its axis of rotation X is permanently collinear or substantially collinear with the normal n at the optical surface 2 , the orientation of the tool 1 is thus optimal at all times.

Dans le mode de réalisation illustré sur les figures 1 et 2, la surface d'extrémité 13 du support 4 est plane.In the embodiment illustrated on the figures 1 and 2 , the end surface 13 of the support 4 is flat.

L'outil 1 est ainsi adapté à surfacer une certaine gamme de surfaces optiques 2 de courbures différentes.The tool 1 is thus adapted to surface a certain range of optical surfaces 2 of different curvatures.

Afin de modifier l'adaptabilité de l'outil 1, il est possible de précontraindre les moyens de rappel 15 en tordant les lamelles flexibles 18 pour qu'elles soient déjà fléchies au repos, dans un sens ou dans l'autre.In order to modify the adaptability of the tool 1, it is possible to prestress the biasing means 15 by twisting the flexible strips 18 so that they are already bent at rest, in one direction or the other.

Lorsqu'au repos les lamelles 18 sont droites ou fléchies à l'opposé de la surface d'extrémité 13, l'outil 1 est destiné aux surfaces optiques 2 concaves, tandis que lorsqu'au repos les lamelles 18 sont fléchies du côté de la surface d'extrémité 13, l'outil 1 est destiné aux surfaces optiques 2 convexes.When, at rest, the lamellae 18 are straight or bent opposite the end surface 13, the tool 1 is intended for the concave optical surfaces 2, whereas when the slats 18 are bent on the side of the end surface 13, the tool 1 is intended for 2 convex optical surfaces.

Dans une première variante non illustrée, la surface d'extrémité 13 du support 4 est convexe, l'outil 1 étant ainsi destiné à des surfaces optiques 2 présentant une concavité plus prononcée.In a first variant not shown, the end surface 13 of the support 4 is convex, the tool 1 thus being intended for optical surfaces 2 having a more pronounced concavity.

Dans une deuxième variante non illustrée , la surface d'extrémité 13 du support 4 est au contraire concave, l'outil 1 étant ainsi destiné à des surfaces optiques 2 à convexité plus prononcée.In a second variant not shown, the end surface 13 of the support 4 is concave, the tool 1 thus being intended for optical surfaces 2 to more pronounced convexity.

Bien entendu, il est possible de combiner la réalisation concave ou convexe de la surface d'extrémité 13 avec la précontrainte des moyens de rappel 15, tel que décrite ci-dessus.Of course, it is possible to combine the concave or convex embodiment of the end surface 13 with the preload of the return means 15, as described above.

La demande de brevet français 2 857 610 , à laquelle correspond la demande internationale WO 2005/007340 , propose que les moyens de rappel élastique, plutôt que d'être sous la forme d'une pièce étoilée telle que la pièce 19 illustrée sur les figures 1 et 2, présente une partie périphérique continue coopérant à appui avec la partie périphérique du tampon tel que le tampon 6, directement ou par l'intermédiaire de la seule interface telle que l'interface 5 (aucun anneau déformable tel que 17 n'est prévu), les moyens de rappel élastique comportant, outre la partie périphérique continue, une collerette plate ou incurvée fixée rigidement, du côté interne, au support tel que le support 4, cette collerette étant formée par une paroi ajourée ou pleine.The French patent application 2,857,610 , which corresponds to the international demand WO 2005/007340 , proposes that the elastic return means, rather than being in the form of a star-shaped piece such as the piece 19 illustrated on the figures 1 and 2 , has a continuous peripheral part cooperating in support with the peripheral part of the buffer such as the buffer 6, directly or via the only interface such as the interface 5 (no deformable ring such as 17 is provided), the elastic return means comprising, in addition to the continuous peripheral portion, a flat or curved collar rigidly fixed on the inner side to the support such as the support 4, this collar being formed by a perforated or solid wall.

Le caractère continu de la partie périphérique de ce moyen de rappel permet d'accroitre la régularité du surfaçage effectué par l'outil.The continuous character of the peripheral part of this return means makes it possible to increase the regularity of the surfacing carried out by the tool.

OBJET DE L'INVENTIONOBJECT OF THE INVENTION

L'invention vise un outil de surfaçage du même genre, mais dans lequel la régularité du surfaçage est encore améliorée ainsi que ses qualités de simplicité, de commodité et d'économie.The invention relates to a surfacing tool of the same kind, but in which the smoothness of the surfacing is further improved as well as its qualities of simplicity, convenience and economy.

L'invention propose à cet effet un outil de surfaçage d'une surface optique, comportant :

  • un support rigide présentant une surface transversale d'extrémité ;
  • une interface élastiquement compressible qui est appliquée contre et recouvre ladite surface d'extrémité ;
  • un tampon souple adapté à être appliqué contre la surface optique qui est appliqué contre et recouvre au moins en partie l'interface à l'opposé et au droit de ladite surface d'extrémité, ledit tampon comportant une partie dite centrale qui se trouve au droit de ladite surface d'extrémité et une partie dite périphérique qui se trouve transversalement au-delà de ladite surface d'extrémité ; et
  • des moyens de rappel élastique raccordant cette partie périphérique au support, la combinaison de ladite partie périphérique et des moyens de rappel formant un moyen de stabilisation de l'outil lors du surfaçage, ledit outil étant adapté à réaliser un surfaçage pour l'essentiel au niveau de ladite partie centrale ;
caractérisé en ce que 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.To this end, the invention proposes a tool for surfacing an optical surface, comprising:
  • a rigid support having a transverse end surface;
  • an elastically compressible interface which is applied against and covers said end surface;
  • a flexible pad adapted to be applied against the optical surface which is applied against and covers at least part of the interface opposite and to the right of said end surface, said pad comprising a so-called portion central located at the right of said end surface and a so-called peripheral portion which is transversely beyond said end surface; and
  • elastic return means connecting this peripheral portion to the support, the combination of said peripheral portion and return means forming a stabilizing means of the tool during surfacing, said tool being adapted to perform a surfacing essentially at the level of of said central portion;
characterized in that said rigid support belongs to a base comprising a flexible flange surrounding said support, said elastically compressible interface being applied against and covering an end surface of said flange located on the same side as said end surface.

Grâce à la collerette, la surface de contact entre l'interface et le reste de l'outil est particulièrement importante, ce qui assure une répartition uniforme de la pression exercée sur la surface à travailler.Thanks to the flange, the contact surface between the interface and the rest of the tool is particularly important, which ensures a uniform distribution of the pressure exerted on the surface to be worked.

L'outil selon l'invention permet donc d'effectuer des surfaçages offrant une grande qualité d'aspect.The tool according to the invention therefore makes it possible to perform surfacing with a high quality of appearance.

Au surplus, cette plus grande surface de contact facilite l'assujettissement de l'interface avec le support rigide, notamment par encollage.In addition, this larger contact surface facilitates the subjection of the interface with the rigid support, especially by gluing.

Selon des caractéristiques préférées pour la qualité des résultats obtenus ou pour des questions de simplicité et de commodité tant à la fabrication qu'à l'utilisation :

  • la surface d'extrémité de la collerette est à fleur de ladite surface d'extrémité dudit support ;
    • ladite collerette est subdivisée en pétales ;
    • le support rigide comporte une cavité d'accueil de la tête d'une broche de machine de surfaçage ;
    • ladite cavité comporte une portion sphérique bordée par une nervure annulaire ;
    • le support rigide présente dans une paroi latérale une gorge d'accueil d'une nervure desdits moyens de rappel élastique ;
    • lesdits moyens de rappel élastique sont formés par une pièce étoilée dont chacune des branches présente du côté de son extrémité libre et du côté qui regarde vers ladite embase, un redan ;
    • chaque dit redan présente du côté externe, une surface conformée en portion de tore, grâce à quoi ladite pièce étoilée est adaptée à recevoir ledit anneau déformable ;
    • ladite embase est en matière plastique moulée d'une seule pièce ;
    • lesdits moyens de rappel élastique sont formés par une pièce étoilée en matière plastique moulée d'une seule pièce ; et/ou
    • ladite embase est en matière plastique moulée d'une seule pièce ; lesdits moyens de rappel élastique sont formés par une pièce étoilée en matière plastique moulée d'une seule pièce ; et la matière plastique dans laquelle est faite ladite embase est distincte de la matière plastique dans laquelle est faite ladite pièce étoilée.
According to preferred characteristics for the quality of the results obtained or for questions of simplicity and convenience both in manufacture and use:
  • the end surface of the flange is flush with said end surface of said support;
    • said collar is subdivided into petals;
    • the rigid support comprises a cavity for receiving the head of a surfacing machine spindle;
    • said cavity comprises a spherical portion bordered by an annular rib;
    • the rigid support has in a side wall a groove for receiving a rib of said elastic return means;
    • said elastic return means are formed by a star-shaped part, each branch having on the side of its free end and on the side facing said base, a redan;
    • each said redan has on the outer side, a shaped surface toroidal portion, whereby said star piece is adapted to receive said deformable ring;
    • said base is made of plastic molded in one piece;
    • said elastic return means are formed by a star piece of plastic material molded in one piece; and or
    • said base is made of plastic molded in one piece; said elastic return means are formed by a star piece of plastic material molded in one piece; and the plastic material in which said base is made is distinct from the plastic material in which said starry part is made.

BREVE DESCRIPTION DES DESSINSBRIEF DESCRIPTION OF THE DRAWINGS

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

  • la figure 4 est une vue en perspective éclatée d'une partie de l'outil conforme à l'invention, et plus précisément de l'embase, de l'anneau déformable et de la pièce étoilée ;
  • la figure 5 est une vue de dessus représentant cette partie de l'outil selon l'invention, à l'état assemblé ;
  • la figure 6 est la vue en élévation-section repérée par VI-VI sur la figure 5;
  • la figure 7 est une vue schématique en coupe d'une autre portion de l'outil selon l'invention, comportant l'interface élastiquement compressible et le tampon souple ;
  • la figure 8 est une vue en élévation-section d'une variante de l'embase ; et
  • les figures 9 et 10 sont des vues en plan de dessous montrant d'autres variantes de l'embase que comporte l'outil selon l'invention.
The disclosure of the invention will now be continued by the detailed description of preferred embodiments, given below by way of illustration and not limitation, with reference to the accompanying drawings. On these:
  • the figure 4 is an exploded perspective view of a portion of the tool according to the invention, and more specifically the base, the deformable ring and the star piece;
  • the figure 5 is a top view showing that part of the tool according to the invention, in the assembled state;
  • the figure 6 is the elevation-section view marked by VI-VI on the figure 5 ;
  • the figure 7 is a schematic sectional view of another portion of the tool according to the invention, comprising the elastically compressible interface and the flexible pad;
  • the figure 8 is an elevation-section view of a variant of the base; and
  • the Figures 9 and 10 are bottom plan views showing other variants of the base that comprises the tool according to the invention.

DESCRIPTION DETAILLEE D'UN EXEMPLE DE REALISATIONDETAILED DESCRIPTION OF AN EXEMPLARY EMBODIMENT

Dans ce qui suit, on a employé pour l'outil conforme à l'invention les mêmes références numériques que pour l'outil 1, mais augmentées de 100.In what follows, the same numerical references as for tool 1 were used for the tool according to the invention, but increased by 100.

D'une façon générale, l'outil 101 est agencé comme l'outil 1, avec :

  • un support rigide 104 présentant une surface transversale d'extrémité 113 ;
  • une interface élastiquement compressible 105 (figure 7) qui est appliquée contre et recouvre la surface d'extrémité 113 ;
  • un tampon souple 106 (figure 7) apte à être appliqué contre la surface optique telle que 2 d'une lentille telle que 3 et qui est appliqué contre et recouvre au moins en partie l'interface 105 à l'opposé et au droit de la surface d'extrémité 113, le tampon 106 comportant une partie centrale qui se trouve au droit de la surface d'extrémité 113 et une partie périphérique qui se trouve transversalement au-delà de la surface d'extrémité 113 ; et
  • des moyens de rappel élastique 115, formés ici par une pièce étoilée 119, raccordant la partie périphérique du tampon 106 au support 104, lequel est entouré transversalement par un anneau déformable 117 interposé entre la partie périphérique de l'interface 105 et les moyens de rappel 115, la combinaison de la partie périphérique du tampon 106 et des moyens de rappel formant un moyen de stabilisation de l'outil 101 lors du surfaçage, l'outil 101 étant adapté à réaliser un surfaçage pour l'essentiel au niveau de la partie centrale du tampon 106.
In general, the tool 101 is arranged as the tool 1, with:
  • a rigid support 104 having a transverse end surface 113;
  • an elastically compressible interface 105 ( figure 7 ) which is applied against and covers the end surface 113;
  • a flexible pad 106 ( figure 7 ) adapted to be applied against the optical surface such as 2 of a lens such as 3 and which is applied against and covers at least part of the interface 105 opposite and to the right of the end surface 113, the buffer 106 having a central portion which is right of the end surface 113 and a peripheral portion which is transversely beyond the end surface 113; and
  • elastic return means 115, formed here by a star piece 119, connecting the peripheral portion of the buffer 106 to the support 104, which is transversely surrounded by a deformable ring 117 interposed between the peripheral portion of the interface 105 and the return means 115, the combination of the peripheral portion of the buffer 106 and the return means forming a stabilizing means of the tool 101 during the surfacing, the tool 101 being adapted to perform a surfacing essentially at the central portion buffer 106.

Conformément à l'invention, le support 104 appartient à une embase 130 qui présente une partie périphérique flexible 131 se trouvant transversalement au-delà du support rigide 104, qui est disposé centralement.According to the invention, the support 104 belongs to a base 130 which has a flexible peripheral portion 131 located transversely beyond the rigid support 104, which is centrally disposed.

La partie périphérique 131 forme globalement une collerette flexible ayant un diamètre externe (grand diamètre) semblable au diamètre externe de l'interface 105 et du tampon 106.The peripheral portion 131 generally forms a flexible collar having an outer diameter (large diameter) similar to the outer diameter of the interface 105 and the buffer 106.

Le diamètre interne (petit diamètre) de la collerette flexible 131 correspond au diamètre externe du support 104, la collerette 131 saillant de la paroi latérale du support 104.The inner diameter (small diameter) of the flexible collar 131 corresponds to the external diameter of the support 104, the flange 131 projecting from the lateral wall of the support 104.

Dans l'exemple illustré sur les figures 4 à 6, le support 104 et la collerette périphérique flexible 131 sont en matière plastique moulée d'une seule pièce, le support 104 étant massif au moins au voisinage de la surface 113 afin de présenter la rigidité requise tandis que la collerette 131 est à faible épaisseur de paroi afin d'être flexible.In the example shown on the Figures 4 to 6 , the support 104 and the flexible peripheral collar 131 are made of one-piece molded plastic, the support 104 being solid at least in the vicinity of the surface 113 to have the required rigidity while the flange 131 is thin wall thickness to be flexible.

Dans l'exemple préféré illustré sur les figures 4 à 6, la collerette 131 présente douze fentes 133 orientées radialement et réparties équi-angulairement, de sorte que la collerette 131 est subdivisée en douze pétales 134 chacun conformé globalement en tronc de secteur angulaire.In the preferred example illustrated on Figures 4 to 6 the flange 131 has twelve slots 133 oriented radially and equiangularly distributed, so that the flange 131 is subdivided into twelve petals 134 each generally formed as an angular sector trunk.

La subdivision de la collerette 131 en pétales permet à cette collerette d'être flexible afin de se conformer à différentes courbures de surfaces à polir.The subdivision of the collar 131 into petals allows this collar to be flexible in order to conform to different curvatures of surfaces to be polished.

La surface d'extrémité 113 du support 104 est à fleur de la surface 132 de la collerette 131 située du même côté.The end surface 113 of the support 104 is flush with the surface 132 of the flange 131 on the same side.

Le fait que le support 104 et la collerette 131 soient fait d'une seule pièce permet de réduire les effets de marquage du bord de la surface d'extrémité 113 sur la surface à travailler, de sorte que l'outil 101 permet d'effectuer des surfaçages offrant une grande qualité d'aspect.The fact that the support 104 and the collar 131 are made in one piece makes it possible to reduce the effects of marking the edge of the end surface 113 on the surface to be worked, so that the tool 101 makes it possible to perform surfacing with a high quality of appearance.

Du fait de la différence d'épaisseur entre la collerette 131 et le support 104, il existe, du côté opposé aux surfaces 132 et 113, un épaulement 135 à la jonction entre la collerette 131 et le support 104.Because of the difference in thickness between the flange 131 and the support 104, there is, on the opposite side to the surfaces 132 and 113, a shoulder 135 at the junction between the flange 131 and the support 104.

D'une façon générale, le support 104 a le contour externe d'un chapeau avec une portion proximale 137 qui présente un diamètre externe plus petit que la portion distale 136 à laquelle appartiennent la surface d'extrémité 113 et l'épaulement 135.In general, the support 104 has the outer contour of a cap with a proximal portion 137 which has an outer diameter smaller than the distal portion 136 to which the end surface 113 and the shoulder 135 belong.

La portion proximale 137 sert à raccorder le support 104, et plus généralement l'embase 130, d'une part, aux moyens de rappel élastique 115, ici formés par la pièce étoilée 119, et, d'autre part, à la broche de la machine de surfaçage permettant à l'outil 101 de coopérer avec une surface optique telle que 2 de la façon expliquée ci-dessus à l'appui des figures 2 et 3.The proximal portion 137 serves to connect the support 104, and more generally the base 130, on the one hand, to the elastic return means 115, here formed by the star piece 119, and, on the other hand, to the pin of the surfacing machine allowing the tool 101 to cooperate with an optical surface such as 2 in the manner explained above in support of Figures 2 and 3 .

La partie proximale 137 présente un renfoncement annulaire 138 débouchant du côté opposé à la surface d'extrémité 113 et s'étendant axialement dans la partie 137 jusqu'à proximité de la partie 136.The proximal portion 137 has an annular recess 138 opening on the opposite side to the end surface 113 and extending axially in the portion 137 to near the portion 136.

La surface latérale interne du renfoncement 138 délimite un fût annulaire 139 de réception de la tête de la broche d'une machine de surfaçage.The inner side surface of the recess 138 defines an annular drum 139 for receiving the spindle head of a surfacing machine.

Pour ce faire, le fût 139 présente une cavité 140 d'accueil de la tête de broche. La cavité 140 présente une portion sphérique 141 conformée globalement comme trois-quarts d'une sphère, une nervure annulaire 142 et une portion tronconique 143, la nervure annulaire 142 étant disposée entre les portions 141 et 143.To do this, the drum 139 has a cavity 140 for receiving the spindle head. The cavity 140 has a spherical portion 141 generally formed as three quarters of a sphere, an annular rib 142 and a frustoconical portion 143, the annular rib 142 being disposed between the portions 141 and 143.

La tête de broche prévue pour être accueillie dans la cavité 140 comporte une extrémité en portion de sphère conformée comme la portion 141 et une portion cylindrique de plus petit diamètre que la nervure 142.The spindle head intended to be accommodated in the cavity 140 has a spherical portion end shaped as the portion 141 and a cylindrical portion of smaller diameter than the rib 142.

L'assemblage entre le fût 139 et la broche de la machine se fait par simple encliquetage, l'épaisseur de paroi du fût 139 étant suffisamment faible, grâce au renfoncement 138, pour pouvoir se déformer afin que la partie sphérique de la tête de broche se loge dans la portion 141.The assembly between the drum 139 and the spindle of the machine is done by simple snapping, the wall thickness of the drum 139 being sufficiently small, thanks to the recess 138, to be able to deform so that the spherical portion of the spindle head is lodged in portion 141.

Lorsque la tête de broche est engagée dans la cavité 140, l'outil 101 coopère en liaison rotule par rapport à la broche.When the spindle head is engaged in the cavity 140, the tool 101 co-operates in a ball joint relation to the spindle.

On notera que le centre de la portion sphérique 141 est particulièrement proche de la surface d'extrémité 113, ce qui permet à l'outil 101 de s'orienter de façon optimale par rapport à la surface telle que 2 avec laquelle l'outil 101 doit coopérer.It will be noted that the center of the spherical portion 141 is particularly close to the end surface 113, which allows the tool 101 to orient itself optimally with respect to the surface such as 2 with which the tool 101 must cooperate.

Un fût annulaire 144 est délimité par la paroi latérale de la partie proximale 137 et par la paroi latérale externe du renfoncement 138.An annular shaft 144 is delimited by the side wall of the proximal portion 137 and the outer lateral wall of the recess 138.

Dans la paroi latérale de la portion 137 est ménagée une gorge 147 de réception d'une nervure 148 de la pièce étoilée 119 formant les moyens de rappel élastique 115.In the side wall of the portion 137 is formed a groove 147 for receiving a rib 148 of the star piece 119 forming the elastic return means 115.

Le fût annulaire 144 peut se déformer pour permettre la mise en place de la nervure148 dans la gorge 147 grâce au fait que l'épaisseur de paroi du fût 137 est relativement faible et que le renfoncement annulaire 138 offre le débattement requis.The annular barrel 144 can be deformed to allow the rib 144 to fit into the groove 147 by virtue of the fact that the wall thickness of the barrel 137 is relatively small and the annular recess 138 provides the required deflection.

La nervure 148 de la pièce étoilée 119 saille dans l'alésage que présente la partie centrale 120 de cette pièce, cet alésage ayant un diamètre correspondant à celui de la surface latérale de la partie distale 137 du support 104.The rib 148 of the star piece 119 protrudes into the bore of the central part 120 of this part, this bore having a diameter corresponding to that of the lateral surface of the distal portion 137 of the support 104.

Lorsque la partie centrale 120 de la pièce étoilée 119 est en place sur le support 104, ces deux pièces peuvent tourner l'une par rapport à l'autre autour de leur axe commun X.When the central portion 120 of the star piece 119 is in place on the support 104, these two parts can rotate relative to each other about their common axis X.

Sur la figure 5, les branches 118 de la pièce étoilée 119 sont chacune centrées angulairement par rapport à un pétale 134 respectif de la collerette 131, mais ce positionnement relatif peut être différent.On the figure 5 , the branches 118 of the star piece 119 are each angularly centered with respect to a respective petal 134 of the flange 131, but this relative positioning may be different.

Chacune des branches 118 de la pièce 119 présente à proximité de son extrémité libre et du côté qui regarde vers l'embase 130, un redan 145 qui présente, du côté externe, une surface 146 conformée en portion de tore centrée sur l'axe central de la pièce 119, et donc plus généralement de l'outil 101.Each of the branches 118 of the piece 119 has near its free end and the side facing the base 130, a step 145 which has, on the external side, a surface 146 shaped toroidal portion centered on the central axis of the piece 119, and therefore more generally of the tool 101.

Les surfaces 146 des différents redans 145 sont en correspondance les unes des autres et avec la surface externe de l'anneau déformable 117.The surfaces 146 of the different steps 145 are in correspondence of each other and with the external surface of the deformable ring 117.

Plus précisément, il faut légèrement étirer l'anneau 117 pour qu'il puisse se mettre en place contre les redans 145, de la façon montrée sur les figures 5 et 6, l'élasticité de l'anneau 117 le maintenant appliqué contre les surfaces 146.More precisely, it is necessary to slightly stretch the ring 117 so that it can be put in place against the steps 145, as shown on the Figures 5 and 6 the elasticity of the ring 117 keeps it pressed against the surfaces 146.

Comme on le voit en particulier sur la figure 6, l'anneau 117, lorsqu'il est en place, est pris en sandwich entre les moyens de rappel élastique 115 (pièce étoilée 119) et la collerette flexible 131.As we see in particular on the figure 6 the ring 117, when in place, is sandwiched between the elastic return means 115 (star part 119) and the flexible collar 131.

Comme indiqué ci-dessus, le diamètre de l'interface 105 et du tampon 106 correspond au diamètre externe de la collerette 131.As indicated above, the diameter of the interface 105 and the buffer 106 corresponds to the external diameter of the flange 131.

L'assujettissement entre l'interface 105 et l'embase 130 s'effectue grâce à un adhésif double face 150 disposé entre l'interface 105 et les surfaces 113 et 132 de l'embase 130.The securing between the interface 105 and the base 130 is performed by a double-sided adhesive 150 disposed between the interface 105 and the surfaces 113 and 132 of the base 130.

Dans l'exemple illustré, l'interface élastiquement compressible 105 est une mousse ayant une épaisseur de l'ordre de 9 mm avec une peau brillante qui est située du côté du tampon 106.In the example illustrated, the elastically compressible interface 105 is a foam having a thickness of the order of 9 mm with a glossy skin which is located on the side of the pad 106.

Du côté opposé à la peau, c'est-à-dire du côté de l'adhésif double face 150, est thermo-soudée une pellicule 151 en polyester (PET), ayant par exemple une épaisseur de 23 micromètres.On the side opposite the skin, that is to say on the side of the double-sided adhesive 150, is heat-welded a film 151 of polyester (PET), having for example a thickness of 23 microns.

La liaison entre l'interface élastiquement compressible 105 et le tampon souple 106 se fait grâce à une couche 152 de mastic d'encollage, ici une couche de 0,5 mm d'épaisseur.The connection between the elastically compressible interface 105 and the flexible pad 106 is done through a layer 152 of sizing putty, here a layer of 0.5 mm thick.

Toujours dans l'exemple illustré sur la figure 7, le tampon souple 106 a une épaisseur de l'ordre de 1 mm et l'adhésif double face 150 a une épaisseur de l'ordre de 0,32 mm.Still in the example shown on the figure 7 , the flexible pad 106 has a thickness of the order of 1 mm and the double-sided adhesive 150 has a thickness of the order of 0.32 mm.

Le diamètre de l'interface 105 et du tampon 106 est de l'ordre de 55 mm.The diameter of the interface 105 and the buffer 106 is of the order of 55 mm.

La pièce étoilée 119 et l'embase 130 sont chacune en matière plastique moulée d'une seule pièce par injection.The star part 119 and the base 130 are each made of plastic molded in one piece by injection.

Dans l'exemple illustré, l'embase 130, qui doit à la fois être rigide au voisinage de la surface d'extrémité 113 et flexible au niveau de la collerette 131 et des fûts annulaires 139 et 141 pour permettre les encliquetages, tout en offrant une bonne résistance à l'usure pour la coopération avec la tête de broche, est en polypropylène (PP) ou en polyéthylène haute densité (par exemple PEHD 1000).In the example shown, the base 130, which must both be rigid in the vicinity of the end surface 113 and flexible at the collar 131 and the annular barrels 139 and 141 to allow the snaps, while offering good wear resistance for cooperation with the spindle head, is made of polypropylene (PP) or high density polyethylene (eg HDPE 1000).

Afin de présenter l'élasticité requise, la pièce étoilée 119 est de préférence en polyoxyméthylène (POM), voir en polyamide (PA) afin d'avoir un module d'élasticité compris entre 1500 et 4000 N/mm2.In order to have the required elasticity, the star piece 119 is preferably polyoxymethylene (POM), see polyamide (PA) in order to have a modulus of elasticity of between 1500 and 4000 N / mm 2 .

Ainsi, la pièce étoilée 119 et l'embase 130 sont de préférence faites dans des matières différentes, puisqu'elles doivent répondre à des contraintes physiques différentes, la pièce étoilée formant les moyens de rappel élastique devant présenter de bonnes caractéristiques de rappel élastique tandis que l'embase doit présenter une bonne résistance à l'usure pour la coopération avec la tête de broche et elle doit permettre un collage aisé avec l'interface 105.Thus, the star piece 119 and the base 130 are preferably made of different materials, since they must respond to different physical constraints, the star piece forming the elastic return means having good elastic return characteristics while the base must have good wear resistance for cooperation with the spindle head and must allow easy bonding with the interface 105.

Dans l'exemple illustré, l'anneau déformable 117 est un simple joint torique du commerce, par exemple en Nitrile.In the illustrated example, the deformable ring 117 is a simple commercial O-ring, for example Nitrile.

La surface d'extrémité 113 du support 104 est conformée comme une portion de sphère ayant un rayon de courbure de l'ordre de 70 mm.The end surface 113 of the support 104 is shaped like a sphere portion having a radius of curvature of the order of 70 mm.

Lorsque l'embase 130 est au repos, c'est-à-dire en l'absence de sollicitations externes, la surface 132 de la collerette 131 qui, comme indiqué ci-dessus, est à fleur de la surface 113, est conformée comme un tronc de cône dont le petit diamètre correspond au plus grand diamètre de la surface 113, l'inclinaison (angle au sommet) de la surface 131 étant donnée par la tangente à la surface 113 au niveau de la zone de jonction avec la surface 132.When the base 130 is at rest, that is to say in the absence of external stresses, the surface 132 of the flange 131 which, as indicated above, is flush with the surface 113, is shaped as a truncated cone whose small diameter corresponds to the largest diameter of the surface 113, the inclination (angle at the apex) of the surface 131 being given by the tangent to the surface 113 at the junction zone with the surface 132 .

Grâce à la collerette 131, la surface de contact entre l'interface 105 et le reste de l'outil, en l'occurrence l'embase 130, est particulièrement importante puisqu'elle est formée à la fois par la surface 113 et par la surface 132.Thanks to the flange 131, the contact surface between the interface 105 and the rest of the tool, in this case the base 130, is particularly important since it is formed both by the surface 113 and by the surface 132.

Cela assure une répartition uniforme de la pression exercée sur la surface à travailler, telle que la surface 2 de la lentille 3.This ensures a uniform distribution of the pressure exerted on the surface to be worked, such as the surface 2 of the lens 3.

On évite en particulier de risquer, comme avec l'outil antérieur illustré sur les figures 1 à 3, de marquer la surface à travailler par le bord, en forme d'arrête, de la surface d'extrémité 13.In particular, risk is avoided, as with the previous tool illustrated on the Figures 1 to 3 , to mark the surface to be worked by the rim-shaped edge of the end surface 13.

Cela permet plus généralement à l'outil 101 d'effectuer des surfaçages ayant des qualités d'aspect particulièrement élevées.This more generally allows the tool 101 to perform surfacing having particularly high aspect qualities.

Par ailleurs, le fait de disposer à la fois de la surface 113 et de la surface 132 facilite l'encollage de l'interface 105 avec le support rigide 104.Moreover, the fact of having both surface 113 and surface 132 facilitates the gluing of interface 105 with rigid support 104.

On va maintenant décrire à l'appui de la figure 8 une variante 130' de l'embase 130. On a employé pour les éléments similaires les mêmes références numériques, mais avec un exposant '.We will now describe in support of the figure 8 a variant 130 'of the base 130. The same reference numerals have been used for the similar elements, but with an exponent'.

L'embase 130' est agencée comme l'embase 130 mais le rayon de courbure R de la surface d'extrémité 113' est bien plus petit, de l'ordre de 30 mm.The base 130 'is arranged as the base 130 but the radius of curvature R of the end surface 113' is much smaller, of the order of 30 mm.

L'outil qui comporte l'embase 130' convient particulièrement pour des surfaces très fortement cambrées.The tool that includes the base 130 'is particularly suitable for very heavily arched surfaces.

Pour les variantes 130" et 130"' de l'embase 130 illustrée respectivement sur les figures 9 et 10 on a employé les mêmes références numériques que ci-dessus, mais avec respectivement un exposant " et "'.For the variants 130 "and 130"'of the base 130 illustrated respectively on the Figures 9 and 10 the same numerical references were used as above, but with an exponent "and"'respectively.

D'une façon générale, les embases 130" et 130"' sont agencées comme l'embase 130 ou l'embase 130' mais leurs collerettes, respectivement 131" et 131"', comportent huit pétales 134" et 134"', respectivement, ces pétales étant délimités par des fentes 133" et 133"', respectivement, qui ne sont pas orientées radialement.In general, the bases 130 "and 130" 'are arranged as the base 130 or the base 130' but their flanges, respectively 131 "and 131" ', have eight petals 134 "and 134"' respectively these petals being delimited by slots 133 "and 133" ', respectively, which are not oriented radially.

Plus précisément, les fentes 133" sont incurvées tandis que les fentes 133"' sont rectilignes mais disposées suivant des directions qui ne sont pas radiales.Specifically, the slots 133 "are curved while the slots 133" 'are straight but arranged in directions that are not radial.

Dans des variantes non illustrées, l'embase de l'outil selon l'invention comporte un nombre de pétales différent de huit ou douze, par exemple six ou seize et les fentes délimitant les pétales présentent des formes différentes, par exemple avec des ondulations.In non-illustrated variants, the base of the tool according to the invention comprises a number of petals different from eight or twelve, for example six or sixteen and the slits defining the petals have different shapes, for example with ripples.

Dans d'autres variantes non illustrées de l'embase 130, la collerette 131 est remplacée par une collerette flexible, mais non subdivisée en pétales.In other non-illustrated variants of the base 130, the collar 131 is replaced by a flexible collar, but not subdivided into petals.

Dans encore d'autre variantes non illustrées, le support 104 est conformé différemment, par exemple en deux parties formant des mors comme dans l'outil antérieur illustré sur les figures 1 à 3.In yet other variants not illustrated, the support 104 is shaped differently, for example in two parts forming jaws as in the previous tool illustrated on the Figures 1 to 3 .

Dans encore d'autres variantes de l'outil selon l'invention, les éléments autres que l'embase sont agencés différemment, par exemple comme illustré sur les figures 1 à 3.In still other variants of the tool according to the invention, the elements other than the base are arranged differently, for example as illustrated in FIGS. Figures 1 to 3 .

De nombreuses autres variantes sont possibles en fonction des circonstances, et on rappelle à cet égard que l'invention ne se limite pas aux exemples décrits et représentés, sans dépasser les limites de l'invention telle que définie par les revendications ci-jointes.Many other variations 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, without exceeding the limits of the invention as defined by the appended claims.

Claims (14)

  1. Tool for surfacing an optical surface, including:
    - a rigid support (104; 104'; 104''; 104''') having a transverse end surface (113; 113');
    - an elastically compressible interface (105) that is pressed against and covers said end surface (113; 113');
    - a flexible pad (106) adapted to be pressed against the optical surface that is pressed against and covers at least part of the interface (105) on the side opposite and in line with said end surface (113; 113'), said pad (106) having a portion called the central portion that is located in line with said end surface (113; 113') and a portion called the peripheral portion that is located transversely beyond said end surface (113; 113'); and
    - spring return means (115) connecting this peripheral portion to the support (104; 104', 104''; 104'''), the combination of said peripheral portion and the return means (115) forming means for stabilizing the tool during surfacing, said tool being adapted to effect surfacing essentially in the region of said central portion;
    characterized in that said rigid support (104; 104'; 104''; 104''') is part of a base (130; 130'; 130''; 130''') including a flexible flange (131; 131'; 131''; 131''') surrounding said support (104; 104'; 104''; 104'''), said elastically compressible interface (105) being pressed against and covering an end surface (132) of said flange situated on the same side as said end surface (113; 113').
  2. Tool according to claim 1, characterized in that said end surface (132) of the flange (131; 131'; 131''; 131''') is flush with said end surface (113; 113') of said support (104; 104'; 104''; 104''').
  3. Tool according to either of claims 1 or 2, characterized in that said flange (131; 131'; 131''; 131"') is subdivided into petals (134; 134'; 134"; 134"').
  4. Tool according to claim 3, characterized in that said petals (134; 134') are subdivided by rectilinear slots (133) oriented radially.
  5. Tool according to claim 3, characterized in that said petals (134''') are subdivided by rectilinear slots (133''') having an orientation other than radial.
  6. Tool according to claim 3, characterized in that said petals (134'') are subdivided by curved slots (133'').
  7. Tool according to any one of claims 1 to 6, characterized in that said rigid support (104) includes a cavity (140) to receive the head of a surfacing machine spindle.
  8. Tool according to claim 7, characterized in that said cavity (140) has a spherical portion (140) bordered by an annular rib (142).
  9. Tool according to any one of claims 1 to 7, characterized in that the rigid support (104) has in a lateral wall a groove (147) to receive a rib (148) of said spring return means (115).
  10. Tool according to any one of claims 1 to 9, characterized in that said spring return means (115) are formed by a star-shaped part (119) each branch (118) whereof has on the side of its free end and on the side that faces toward said base (130; 130'; 130''; 130''') a cusp (145).
  11. Tool according to claim 10, characterized in that each of said cusps (145) has, on the external side, a surface (146) conformed as a portion of a torus, thanks to which said star-shaped part is adapted to receive said deformable ring (117).
  12. Tool according to any one of claims 1 to 11, characterized in that said base (130; 130'; 130''; 130''') is molded in one piece in plastic material.
  13. Tool according to any one of claims 1 to 12, characterized in that said spring return means (115) are formed by a star-shaped part (119) molded in one piece in plastic material.
  14. Tool according to any one of claims 1 to 13, characterized in that said base (130; 130'; 130''; 130''') is molded in one piece in plastic material; in that said spring return means (115) are formed by a star-shaped part (119) molded in one piece in plastic material; and in that the plastic material in which said base is made is different from the plastic material in which said star-shaped part (119) is made.
EP07731314A 2006-04-27 2007-04-18 Optical surface surfacing tool Active EP2012969B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07731314T PL2012969T3 (en) 2006-04-27 2007-04-18 Optical surface surfacing tool

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0603796A FR2900356B1 (en) 2006-04-27 2006-04-27 TOOL FOR SURFACING AN OPTICAL SURFACE
PCT/FR2007/000650 WO2007128894A1 (en) 2006-04-27 2007-04-18 Optical surface surfacing tool

Publications (2)

Publication Number Publication Date
EP2012969A1 EP2012969A1 (en) 2009-01-14
EP2012969B1 true EP2012969B1 (en) 2009-06-17

Family

ID=36829685

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07731314A Active EP2012969B1 (en) 2006-04-27 2007-04-18 Optical surface surfacing tool

Country Status (15)

Country Link
US (1) US7559829B2 (en)
EP (1) EP2012969B1 (en)
JP (1) JP5415257B2 (en)
KR (1) KR100955617B1 (en)
CN (1) CN101326031B (en)
AT (1) ATE433827T1 (en)
AU (1) AU2007247018B2 (en)
BR (1) BRPI0702859B1 (en)
CA (1) CA2607030C (en)
DE (1) DE602007001345D1 (en)
ES (1) ES2328750T3 (en)
FR (1) FR2900356B1 (en)
PL (1) PL2012969T3 (en)
PT (1) PT2012969E (en)
WO (1) WO2007128894A1 (en)

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Also Published As

Publication number Publication date
ES2328750T3 (en) 2009-11-17
FR2900356A1 (en) 2007-11-02
ATE433827T1 (en) 2009-07-15
BRPI0702859A (en) 2008-04-01
EP2012969A1 (en) 2009-01-14
KR100955617B1 (en) 2010-05-03
WO2007128894A1 (en) 2007-11-15
KR20080018991A (en) 2008-02-29
CN101326031A (en) 2008-12-17
PT2012969E (en) 2009-09-07
BRPI0702859B1 (en) 2020-09-15
JP5415257B2 (en) 2014-02-12
CA2607030C (en) 2014-02-25
US20080171502A1 (en) 2008-07-17
PL2012969T3 (en) 2009-11-30
CN101326031B (en) 2010-10-13
FR2900356B1 (en) 2008-07-18
AU2007247018B2 (en) 2012-03-15
DE602007001345D1 (en) 2009-07-30
AU2007247018A1 (en) 2007-11-15
US7559829B2 (en) 2009-07-14
JP2009534208A (en) 2009-09-24
BRPI0702859A8 (en) 2018-07-31
CA2607030A1 (en) 2007-10-27

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