EP1773593A1 - Method and device for marking an ophthalmic lens - Google Patents

Method and device for marking an ophthalmic lens

Info

Publication number
EP1773593A1
EP1773593A1 EP05775557A EP05775557A EP1773593A1 EP 1773593 A1 EP1773593 A1 EP 1773593A1 EP 05775557 A EP05775557 A EP 05775557A EP 05775557 A EP05775557 A EP 05775557A EP 1773593 A1 EP1773593 A1 EP 1773593A1
Authority
EP
European Patent Office
Prior art keywords
inking
stamp
arrangement
patterns
engravings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05775557A
Other languages
German (de)
French (fr)
Other versions
EP1773593B1 (en
Inventor
Moreno Lucchesi
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
Application filed by Essilor International Compagnie Generale dOptique SA filed Critical Essilor International Compagnie Generale dOptique SA
Publication of EP1773593A1 publication Critical patent/EP1773593A1/en
Application granted granted Critical
Publication of EP1773593B1 publication Critical patent/EP1773593B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/001—Pad printing apparatus or machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/36—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on tablets, pills, or like small articles

Definitions

  • the invention relates to the general field of the marking of ophthalmic lenses. It relates more particularly to a method and a device for depositing ink on an ophthalmic lens according to predetermined forms.
  • the manufacturing methods generally employed to obtain a finished and shaped lens-shaped ophthalmic lens typically include steps in which the ophthalmic lens receives markings on its surface.
  • the lens may receive points or crosses identifying a particular point (for example the optical center of the ophthalmic lens), centerlines (for example to indicate the axis in which the astigmatism is corrected), shapes defining a particular zone (for example, near vision zone or far vision zone in the case of progressive ophthalmic lenses).
  • markings relating to the identification of the ophthalmic lens may be necessary to make markings relating to the identification of the ophthalmic lens or other commercial markings.
  • marking with the aid of an inked stamp applied to said surface is commonly used for its low cost of implementation and its marking accuracy.
  • Methods of depositing ink on an ophthalmic lens, in which an ophthalmic lens is placed on a support are thus known in the vicinity of a plate comprising engravings reproducing the shapes to be printed on the lens, this plate being commonly called “cliche”.
  • the snapshot and the ophthalmic lens are both accessible to an elastically deformable tampon, generally made of silicone.
  • the stamp is first applied to the surface of the plate when the latter has been previously inked (that is to say that the prints of the plate have been filled) thanks to ink).
  • the pad is then removed from the surface of the plate, the ink contained in the etchings adhering to the pad to form an inked pad.
  • the inked pad is then applied to the surface of the ophthalmic lens that is to be marked and the ink arranged according to the engravings of the plate is then transferred from the pad to the surface of the ophthalmic lens.
  • Document US 2003/0107704 discloses a method for printing markings on a progressive ophthalmic lens. This method provides for depositing on an ophthalmic lens a pattern which comprises a graduated portion.
  • This method thus makes it possible to print the same pattern on progressive ophthalmic lenses of different characteristics.
  • the graduations then make it possible to identify the particular points specific to each type of lens. Thanks to this method, it is therefore not necessary to have a specific marking for each of the types of progressive ophthalmic lenses.
  • the object of the invention is to improve this type of printing process of an ophthalmic lens.
  • the invention provides a method for marking an ophthalmic lens according to predetermined patterns, this process comprising the following steps: providing a plate comprising engravings reproducing said predetermined patterns according to a first arrangement; filling said engravings with a marking ink; - applying a stamp on the etchings of said plate so that the ink contained in the etchings adheres to the pad to form an ink pad bearing said patterns according to the first arrangement; - Applying the inked stamp on an ophthalmic lens so as to deposit the ink arranged according to said predetermined patterns; this method being characterized in that it comprises a preliminary step of preparation of the buffer so as to delimit at least two inking portions movable relative to each other and in that it comprises in furthermore, between the step of applying the stamp on the plate and the step of applying the stamp inked on the lens, a transformation step during which the arrangement of the inking portions by relative displacement of said elements is modified; inking portions so as to determine a second arrangement of said patterns whereby the patterns are deposited on
  • Such a method allows, from a single shot, in a single application of the buffer on the ophthalmic lens, print different sizes or pattern shapes from an initial pattern of the shot.
  • One and the same shot can be used for printing lenses of different characteristics.
  • each type of progressive ophthalmic lens corresponds to a specific marking in which the marking identifying the far vision zone has a very precise positioning relative to the marking identifying the near vision zone. If the "far vision" marking is carried by one of the portions of the buffer surface and the "near vision" marking is carried by another portion of the buffer surface, the relative position of these two markings may be set for each type of ophthalmic lens.
  • Each lens receives the marking which is specific to it and not a graduated universal marking which requires a later step of reading the graduations.
  • the relative displacement of said inking portions is carried out by moving one of the inking portions with the aid of an actuator; the second arrangement of the patterns is determined by placing one of the inking portions in position against stops; -
  • the method further comprises a step of adjusting said stops before the positioning of said inking portion; said step of adjusting the stops is carried out simultaneously with other steps; during the step of applying the stamp to the engravings, the inking of the stamp is carried out by all of the said engravings.
  • the marking method furthermore comprises, between the step of filling the etchings and the step of applying the stamp on the etchings, a configuration step during which the layout of the portions is modified.
  • the inking of the stamp may be carried out only by a part of said engravings, said inking arrangement of the stamp allowing selection of the engravings for inking the stamp.
  • a method according to this embodiment allows the use of a plate having an engraving area common to different predetermined patterns as well as specific engraving areas. Before inking the stamp, the two inking portions are first positioned relative to each other so that said common engraving area comes to ink one of the inking portions while specific area chosen inked the other portion of inking.
  • the transformation step allows the buffer to reconstitute the predetermined patterns to be applied to a lens.
  • a single image having a common inking area and specific inking areas can thus be used, instead of a multitude of specific shots, to deposit on different lenses different patterns having a common area.
  • the invention also relates to a device for marking an ophthalmic lens according to predetermined patterns, this device being suitable for implementing the method described above and comprising: a support for receiving a plate provided with engravings reproducing said predetermined patterns in a first arrangement; a support for receiving an ophthalmic lens; - An inking device of the plate; a buffer comprising an inking surface by which it is intended to come selectively opposite the first support in an inking position or the second support in a marking position; this device being characterized in that the buffer comprises at least two inking portions movable relative to each other and in that a displacement control member is provided for moving said inking portions between the position inking and the marking position, whereby the stamp is adapted to be inked according to said patterns arranged according to the first arrangement, said patterns being adapted to be arranged in a second arrangement in the marking position.
  • the device can also be implemented with the following preferred characteristics: a first of said inking portions is connected to a first rigid member and a second of said inking portions is connected to a second rigid member, the first rigid member and the second rigid member being adapted to be moved relative to each other, and in that said moving control member acts on at least one of the rigid members; -
  • the first inking portion is mounted on a fixed support and the second inking portion is mounted on a movable support;
  • the mobile support is adapted to be controlled by an actuator;
  • the mobile support is adapted to cooperate with fixed stops;
  • the mobile support is adapted to cooperate with movable stops;
  • the first inking portion and the second inking portion are mounted on the same fixed support, the second portion being made of an elastically deformable material and being connected to a rigid bar movable relative to said fixed support; said rigid bar is attached to the fixed support by a ball joint; said rigid bar is adapted to be controlled by an actuator;
  • - The first inking portion and the second inking portion
  • FIG. 1 represents a cliché seen from above comprising visible engravings
  • FIG. 2 is an ophthalmic lens viewed from above after markings have been printed on its surface from the plate of FIG. 1;
  • FIG. 3 is a perspective view of a buffer according to the invention
  • - Figure 4 is a view similar to Figure 3, a portion of the buffer has been removed from the rest of the buffer
  • - Figure 5 is an exploded view of the buffer of Figures 3 and 4
  • - Figures 6 and 7 are top views of a buffer according to an alternative embodiment of the invention, the buffer being respectively in a first and a second position
  • - Figures 8 to 11 are schematic side views showing successive steps of marking an ophthalmic lens according to the invention
  • FIG. 12 is a perspective view of a buffer according to an alternative embodiment of the invention
  • Fig. 13 is a perspective view of the pad of Fig.
  • FIG. 15 represents the step of inking a stamp by the plate of FIG. 14
  • FIG. 16 is a view of the stamp of FIG. 15 after the transformation step.
  • Figure 1 shows the surface of an inking plate 1 intended to cooperate with a buffer, this plate is commonly called “cliché".
  • This plate 1 comprises a flat and smooth surface 2 (that visible in this FIG. 1), possibly varnished, and which comprises an inking area 3. At this inking area 3, etchings 4 are made on the surface 2.
  • FIG. 1 Each pattern visible on the plate 1 of Figure 1 corresponds to one of these etchings 4 and can be performed, for example, by machining or chemical removal of material.
  • Figure 2 represents an ophthalmic lens 5 seen from above.
  • This lens 5 is, in the present example, a raw lens that has not yet been cut off, that is to say machined to the shape of a particular frame, which explains its circular shape.
  • the ophthalmic lens 5 comprises on one of its faces markings 6 made in ink and reproducing the arrangement of the engravings 4 of the plate 1 of FIG. 1.
  • the ophthalmic lens 5 has indeed received the markings 6 by the application a buffer previously inked on the inking area 3 of the plate 1, according to the method explained below.
  • the pad 7 represents a buffer 7 adapted to be inked by the plate 1 and to deposit the ink on the lens 5.
  • the pad 7 comprises a support 8 on which is fixed a first portion 9 of buffer made from a material elastically deformable and adapted to ink printing such as, for example, silicone.
  • the buffer 7 further comprises a second portion 10 of buffer attached to a movable member 11.
  • the second portion 10 of buffer is made of the same material as the first portion 9 while the movable member 11 is made from a material rigid.
  • the first buffer portion 9 comprises a contact surface for its cooperation with the plate 1 and the lens 5, this surface being called “first surface” 12.
  • the second buffer portion 10 has a contact surface called "second surface”. surface "13.
  • the first surface 12 and the second surface 13 together form an inking surface 14.
  • the first buffer portion 9 and the second buffer portion 10 also have a complementary shape so that when these two elements are arranged one against the other (which is the case in Figure 3), the first surface 12 and the second surface 13 are in the extension of one another to form a continuous inking surface 14.
  • the movable member 11 conversely, the movable member 11 has been moved, the second portion 10 of buffer is spaced from the first portion 9 of buffer so that the inking surface 14 is here discontinuous.
  • the exploded view of FIG. 5 shows the mechanism allowing displacement of the movable member 11.
  • the support 8 is in fact attached to a frame 15 by a set of spacers 16.
  • the frame 15 is thus arranged in parallel and facing With respect to the support 8.
  • FIG. 15 On this chassis 15, two cylinders 17, 18 are each provided with their movable rod 19, 20 whose end is fixed to the movable member 11. Note that in this FIG. For reasons of arrangement of the exploded view, the movable member 11 has been shown in two separate parts in a horizontal section.
  • the movable member 11 is actually as in Figure 3. It is composed of two walls 21, 22 parallel and held vis-a-vis by two spacers 23 (the imaginary section of Figure 5 occurs at the level of spacers 23).
  • the frame 15 further receives a set of three cams 24 each mounted rotatably about an axis perpendicular to the frame 15.
  • cams 24 Two of these cams 24 are intended to cooperate with one of the edges of the wall 21 while the third cam 24 is intended to cooperate with the adjacent edge of this wall 21, in accordance with Figure 5.
  • Each of the cams 24 is rotated by a motor (not shown).
  • On the frame 15 are further fixed three fixed stops 25 arranged in the same way as the cams 24 but on the other side of the wall 21 of the movable member 11. The movable member 11 can thus be moved between a first end position in which the wall 21 is disposed against the fixed stops 25, and a second end position in which the wall 21 is arranged, thanks to the jacks 17, 18, against the cams. 24 which form adjustable stops.
  • FIG. 6 shows the buffer 7 in a position corresponding to that of FIG. 3, the second buffer portion being disposed against the first buffer portion 9.
  • the movable member 11 is then disposed against the fixed stops 25.
  • FIG. 7 for its part shows the buffer 7 in a position corresponding to that of FIG. 4, the second buffer portion being separated from the first buffer portion 9. .
  • the movable member 11 is then arranged against the cams 24.
  • the plate 1, the lens 5 and the pad 7 are arranged in a printing machine (not shown) which is well known in this type of application.
  • the plate 1 and the lens 5 are respectively placed in position on movable supports in lateral translation while the pad 7 is movable. in vertical translation.
  • the plate 1 first undergoes the passage of an inker 26 intended to fill the etchings 4 of the plate 1 with ink.
  • the inker 26 is a bottomless tank which, when it is applied against the surface 2 of the plate 1, may contain ink 27.
  • the edge of the inker 26 adjacent to the plate 1 is formed of a doctor blade 28 extending around the entire periphery of the inker 26.
  • inking 26 is held fixed against the plate 1 while the latter, from the position of Figure 8 to the position of Figure 9, is translated laterally so that the inker 26 is disposed in the inking area 3 of the plate 1 ( Figure 8) and then be found at the surface 2 of the plate 1 ( Figure 9).
  • This allows the engravings 4 to fill with ink 27, the ink then being scraped by the scraper 28 so as to eliminate the ink from the surface of the inking area 3 to leave only in the engravings 4
  • the pad is then lowered against the inking zone 3 (FIG. Note that in this Figure 9 the buffer 7 is arranged against the plate 1 when in its position corresponding to Figure 7 but can indifferently undergo this operation while it is in the position corresponding to that of Figure 6.
  • Figure 10 shows the next step during which the buffer 7 is raised and the plate 1 is translated to free the space available under the buffer 7.
  • the buffer 7 then has on its first surface 12 and its second surface 13 the inked patterns 29 previously formed by the etchings 4 of the plate 1 and which have now adhered to the stamp 7.
  • Figure 7 shows these inked patterns 29.
  • the stamp 7 comprising the inked patterns 29 forms an inked stamp.
  • This buffer can then be adjusted according to the relative positions that it is desired to give the markings 6 when they are made on the lens 5. For example, in the case of FIGS.
  • the plate 1 and the buffer 7 are provided for that, in the step of Figure 9, a set of inked patterns 29 is disposed on the first surface 12 while a single inked pattern 29, corresponding in our example to the measurement area of the near vision a progressive lens, is disposed on the second surface 13.
  • the cams 24 are controlled to form stops such that, when the movable member 11 is disposed against these stops, the second surface 13 (and therefore the patterns 29 it carries) and the first surface 12 (and therefore the patterns 29 it carries) are in the desired relative position for the intended lens type.
  • the cylinders 17, 18 are then controlled to arrange the movable member 11 against the cams 24 and thus perform the setting.
  • FIG. 11 corresponds to the actual printing of the patterns on the lens 5.
  • the lens 5 is translated under the pad 7, the latter being lowered against the surface of the ophthalmic lens 5 to deposit the inked patterns 29 which will become on the lens 5 the markings 6 visible in Figure 2.
  • the ability of the cams 24 to form movable stops and the possibility of displacement of the movable member 11 thus make it possible to form on a lens 5 markings 6 whose unitary elements come from the engravings 4 of the plate 1 but which have been arranged according to the type of lens particular.
  • Figures 12 and 13 relate to an alternative embodiment of the buffer 7.
  • FIG. 12 shows a buffer 7 whose second buffer portion 10 is fixed on the support 8, like the first buffer portion 9.
  • the second portion 10 of buffer comprises a rigid bar 30 embedded in the material of the second portion 10. This rigid bar is further articulated in a ball 31 fixed relative to the support 8. One end of the bar 30 is disposed near the second surface 13 while the other of these ends, beyond the ball 31, is connected by a hinge 32 to two rigid transverse bars 33 themselves connected to the rods 19, 20 of two jacks fixed on 8.
  • Figures 12 and 13 only the end of the rods 19, 20 of the cylinders has been shown for clarity.
  • FIG. 14 illustrates another embodiment of the method according to the invention.
  • a snapshot 34 (see Fig. 14) is first prepared for inking a tampon 35 (see Fig. 15).
  • This plate 34 comprises a zone A of so-called “common” engravings as well as zones B, C and D, of so-called “specific” engravings.
  • This plate 34 makes it possible to apply on three different types of lenses respectively a first type of marking corresponding to the common area A associated with the specific area B, a second type of marking corresponding to the common area A associated with the specific area C, and a third type of marking corresponding to the common area A associated with the specific area D.
  • This single plate 34 thus allows the marking of different lenses by selection from specific areas to be associated with a common area.
  • FIG. 15 illustrates the inking operation of the stamp 35 by showing the latter disposed against the plate 34, the engravings of the zones A and C, which enable the stamp 35 to be inked, being represented in dashed lines through the buffer 35.
  • the buffer 35 having successively undergone a configuration step and then an inking step, is subsequently subjected to a transformation step to arrive at the position of Figure 16.
  • FIG. 15 illustrates the inking operation of the stamp 35 by showing the latter disposed against the plate 34, the engravings of the zones A and C, which enable the stamp 35 to be inked, being represented in dashed lines through the buffer 35.
  • the buffer 35 having successively undergone a configuration step and then an inking step, is subsequently subjected to a transformation step to arrive at the position of Figure 16.
  • the buffer 35 may undergo a configuration step in which the second portion 37 will be disposed opposite the zone B or D, or any other group of selected etchings of the plate 34 and then return, by the transformation step, to the ink pad 35 of Figure 16, the second portion 37 will in this case other patterns.

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Abstract

A method for marking an ophthalmic lens according to predetermined patterns includes supplying a plate (1) provided with engravings (4), filling the engravings (4) with marking ink, applying a pad (7) to the engravings (4), applying the pad (7) to the ophthalmic lens (5). The method involves a stage for pre-preparing the pad (7) in such a way that at least two movable with respect to each other inking portions (12, 13) are defined and a transformation stage for modifying the arrangement of the inking portions (12, 13) which is carried out between the stage for applying the pad (7) to the plate (1) and the stage for applying the inked pad to the lens (5).

Description

Procédé et dispositif de marquage d'une lentille ophtalmique Method and device for marking an ophthalmic lens
L'invention a trait au domaine général du marquage des lentilles ophtalmiques. Elle concerne plus particulièrement un procédé et un dispositif de dépôt d'encre sur une lentille ophtalmique selon des formes prédéterminées. Les procédés de fabrication généralement employés pour obtenir une lentille ophtalmique finie et taillée à la forme d'une monture particulière comportent typiquement des étapes au cours desquelles la lentille ophtalmique reçoit sur sa surface des marquages. Par exemple, la lentille peut recevoir des points ou des croix identifiant un point particulier (par exemple le centre optique de la lentille ophtalmique), des traits d'axe (par exemple pour indiquer l'axe selon lequel l'astigmatisme est corrigé), des formes délimitant une zone particulière (par exemple, zone de vision de près ou zone de vision de loin dans le cas des lentilles ophtalmiques progressives). De même, il peut être nécessaire d'effectuer des marquages relatifs à l'identification de la lentille ophtalmique ou autres marquages commerciaux. Parmi les diverses technologies permettant de faire apparaître une marque sur la surface d'une lentille ophtalmique, le marquage à l'aide d'un tampon encré appliqué sur ladite surface est couramment employé pour son faible coût de mise en œuvre et sa précision de marquage. On connaît ainsi des procédés de dépose d'encre sur une lentille ophtalmique, au cours desquels une lentille ophtalmique est disposée sur un support, à proximité d'une plaque comportant des gravures reproduisant les formes à imprimer sur la lentille, cette plaque étant couramment dénommée "cliché". Le cliché et la lentille ophtalmique sont tous deux accessibles à un tampon élastiquement déformable, généralement en silicone. Le tampon est tout d'abord appliqué sur la surface du cliché lorsque ce dernier a été préalablement encré (c'est-à-dire que les gravures du cliché ont été remplies grâce à de l'encre). Le tampon est ensuite écarté de la surface du cliché, l'encre contenue dans les gravures adhérant au tampon pour former un tampon encré. Le tampon encré est alors appliqué sur la surface de la lentille ophtalmique que l'on souhaite marquer et l'encre disposée selon les gravures du cliché se transfère alors du tampon à la surface de la lentille ophtalmique. On connaît par ailleurs du document US 2003/0107704 un procédé d'impression de marquages sur une lentille ophtalmique progressive. Ce procédé prévoit de déposer sur une lentille ophtalmique un motif qui comporte une portion graduée. Ce procédé permet ainsi d'imprimer le même motif sur des lentilles ophtalmiques progressives de caractéristiques différentes. Les graduations permettent ensuite de repérer les points particuliers spécifiques à chaque type de lentille. Grâce à ce procédé, il n'est donc pas nécessaire d'avoir un marquage spécifique à chacun des types de lentilles ophtalmiques progressives. Le but de l'invention est d'améliorer ce type de procédé d'impression d'une lentille ophtalmique. A cet effet, l'invention vise un procédé de marquage d'une lentille ophtalmique selon des motifs prédéterminés, ce procédé comportant les étapes suivantes : - fourniture d'une plaque comportant des gravures reproduisant lesdits motifs prédéterminés selon un premier agencement ; - remplissage desdites gravures par une encre de marquage ; - application d'un tampon sur les gravures de ladite plaque de sorte que l'encre contenue dans les gravures adhère au tampon pour former un tampon encré portant lesdits motifs selon le premier agencement ; - application du tampon encré sur une lentille ophtalmique de manière à y déposer l'encre disposée selon lesdits motifs prédéterminés ; ce procédé étant caractérisé en ce qu'il comporte une étape préalable de préparation du tampon en sorte de délimiter au moins deux portions d'encrage mobiles l'une par rapport à l'autre et en ce qu'il comporte en outre, entre l'étape d'application du tampon sur la plaque et l'étape d'application du tampon encré sur la lentille, une étape de transformation au cours de laquelle on modifie l'agencement des portions d'encrage par déplacement relatif desdites portions d'encrage en sorte de déterminer un deuxième agencement desdits motifs grâce à quoi les motifs sont déposés sur la lentille selon le deuxième agencement. Un tel procédé permet, à partir d'un seul et même cliché, en une seule application du tampon sur la lentille ophtalmique, d'imprimer différentes tailles ou formes de motifs à partir d'un motif initial du cliché. Un seul et même cliché peut donc être employé pour l'impression de lentilles de caractéristiques différentes. Par exemple, à chaque type de lentille ophtalmique progressive correspond un marquage spécifique dans lequel le marquage identifiant la zone de vision de loin a un positionnement bien précis par rapport au marquage identifiant la zone de vision de près. Si le marquage "vision de loin" est porté par l'une des portions de la surface du tampon et le marquage "vision de près" est porté par une autre portion de la surface du tampon, la position relative de ces deux marquages peut être réglée pour chaque type de lentille ophtalmique. Chaque lentille reçoit le marquage qui lui est spécifique et non un marquage universel gradué qui nécessite une étape postérieure de lecture des graduations. Ce procédé peut être mis en œuvre selon les caractéristiques préférées suivantes : - le déplacement relatif desdites portions d'encrage est effectué en déplaçant l'une des portions d'encrage à l'aide d'un actionneur ; - le deuxième agencement des motifs est déterminé grâce à la mise en position de l'une des portions d'encrage contre des butées ; - le procédé comporte en outre une un étape de réglage desdites butées avant la mise en position de ladite portion d'encrage ; - ladite étape de réglage des butées est effectuée simultanément à d'autres étapes ; - lors de l'étape d'application du tampon sur les gravures, l'encrage du tampon est réalisé par la totalité desdites gravures. Selon un mode de réalisation, le procédé de marquage comporte en outre, entre l'étape de remplissage des gravures et l'étape d'application du tampon sur les gravures, une étape de configuration au cours de laquelle on modifie l'agencement des portions d'encrage par déplacement relatif desdites portions d'encrage en sorte de présenter un agencement d'encrage prédéterminé desdits motifs grâce à quoi les motifs portés par le tampon encré sont disposés selon ledit agencement d'encrage. Lors de l'étape d'application du tampon sur les gravures, l'encrage du tampon peut n'être réalisé que par une partie desdites gravures, ledit agencement d'encrage du tampon permettant une sélection des gravures pour l'encrage du tampon. Un procédé selon ce mode de réalisation permet l'emploi d'un cliché comportant une zone de gravures communes à différents motifs prédéterminés ainsi que des zones de gravures spécifiques. Avant l'encrage du tampon, les deux portions d'encrage sont tout d'abord positionnées l'une par rapport à l'autre de manière que ladite zone de gravures communes vienne encrer l'une des portions d'encrage tandis qu'une zone spécifique choisie vient encrer l'autre portion d'encrage. Après l'encrage, l'étape de transformation permet au tampon de reconstituer les motifs prédéterminés à appliquer sur une lentille. Un seul cliché comportant une zone d'encrage commune et des zones d'encrage spécifiques peut ainsi être employé, en lieu en place d'une multitude de clichés spécifiques, pour déposer sur différentes lentilles différents motifs ayant une zone commune. L'invention a aussi pour objet un dispositif de marquage d'une lentille ophtalmique selon des motifs prédéterminés, ce dispositif convenant à la mise en œuvre du procédé décrit précédemment et comportant : - un support pour recevoir une plaque munie de gravures reproduisant lesdits motifs prédéterminés selon un premier agencement ; - un support pour recevoir une lentille ophtalmique ; - un dispositif d'encrage de la plaque ; - un tampon comportant une surface d'encrage par laquelle il est destiné à venir sélectivement en regard du premier support dans une position d'encrage ou du deuxième support dans une position de marquage ; ce dispositif étant caractérisé en ce que le tampon comporte au moins deux portions d'encrage mobiles l'une par rapport à l'autre et en ce qu'un organe de commande en déplacement est prévu pour déplacer lesdites portions d'encrage entre la position d'encrage et la position de marquage, grâce à quoi le tampon est adapté à être encré selon lesdits motifs disposés selon le premier agencement, lesdits motifs étant adaptés à être disposés selon un deuxième agencement dans la position de marquage. Le dispositif peut également être mis en œuvre avec les caractéristiques préférées suivantes : - une première desdites portions d'encrage est reliée à un premier organe rigide et une deuxième desdites portions d'encrage est reliée à un deuxième organe rigide, le premier organe rigide et le deuxième organe rigide étant adaptés à être déplacés l'un par rapport à l'autre, et en ce que ledit organe de commande en déplacement agit sur l'un au moins des organes rigides ; - la première portion d'encrage est montée sur un support fixe et la deuxième portion d'encrage est montée sur un support mobile ; - le support mobile est adapté à être commandé par un actionneur ; - le support mobile est adapté à coopérer avec des butées fixes ; - le support mobile est adapté à coopérer avec des butées mobiles ; - la première portion d'encrage et la deuxième portion d'encrage sont montées sur un même support fixe, la deuxième portion étant réalisée en un matériau élastiquement déformable et étant reliée à une barre rigide mobile par rapport audit support fixe ; - ladite barre rigide est rattachée au support fixe par une rotule ; - ladite barre rigide est adaptée à être commandée par un actionneur ; et - la première portion d'encrage et la deuxième portion d'encrage sont en silicone. D'autres caractéristiques et avantages de l'invention apparaissent à la lumière de la description qui va suivre d'un mode de réalisation préféré donné à titre d'exemple non limitatif, description faite en référence aux dessins annexés dans lesquels : - la figure 1 représente un cliché vu de dessus comportant des gravures visibles ; - la figure 2 est une lentille ophtalmique vue de dessus après que des marquages aient été imprimés sur sa surface à partir du cliché de la figure 1 ; - la figure 3 est une vue en perspective d'un tampon selon l'invention ; - la figure 4 est une vue similaire à la figure 3, une portion du tampon ayant été écartée du reste du tampon ; - la figure 5 est une vue éclatée du tampon des figures 3 et 4 ; - les figures 6 et 7 sont des vues de dessus d'un tampon selon une variante de réalisation de l'invention, ce tampon étant respectivement dans une première et une deuxième position ; - les figures 8 à 11 sont des vues schématiques de profil montrant des étapes successives du marquage d'une lentille ophtalmique selon l'invention ; - la figure 12 est une vue en perspective d'un tampon selon une forme de réalisation alternative de l'invention ; et - la figure 13 est une vue en perspective du tampon de la figure 12, une portion du tampon ayant été écartée du reste du tampon ; - la figure 14 représente, en vue de dessus, un cliché prévu pour la mise en œuvre du procédé selon un autre mode de réalisation de l'invention. - la figure 15 représente l'étape d'encrage d'un tampon par le cliché de la figure 14 ; - la figure 16 est une vue du tampon de la figure 15 après l'étape de transformation. La figure 1 montre la surface d'une plaque d'encrage 1 destinée à coopérer avec un tampon, cette plaque étant couramment dénommée "cliché". Ce cliché 1 comporte une surface plane et lisse 2 (celle visible sur cette figure 1), éventuellement vernie, et qui comporte une zone d'encrage 3. Au niveau de cette zone d'encrage 3, des gravures 4 sont pratiquées sur la surface 2. Chaque motif visible sur le cliché 1 de la figure 1 correspond à l'une de ces gravures 4 et peut être effectué, par exemple, par usinage ou procédé chimique de retrait de matière. La figure 2 représente quant à elle une lentille ophtalmique 5 vue de dessus. Cette lentille 5 est, dans le présent exemple, une lentille brute qui n'a pas encore été détourée, c'est-à-dire usinée à la forme d'une monture particulière, ce qui explique sa forme circulaire. La lentille ophtalmique 5 comporte sur l'une de ses faces des marquages 6 réalisés à l'encre et reproduisant la disposition des gravures 4 du cliché 1 de la figure 1. La lentille ophtalmique 5 a en effet reçu les marquages 6 par l'application d'un tampon préalablement encré sur la zone d'encrage 3 du cliché 1, selon le procédé exposé plus loin. La figure 3 représente un tampon 7 adapté à être encré par le cliché 1 et à déposer l'encre sur la lentille 5. Le tampon 7 comporte un support 8 sur lequel est fixée une première portion 9 de tampon réalisée à partir d'un matériau élastiquement déformable et adapté à l'impression d'encre tel que, par exemple, du silicone. Le tampon 7 comporte de plus une deuxième portion 10 de tampon fixée sur un organe mobile 11. La deuxième portion 10 de tampon est faite du même matériau que la première portion 9 tandis que l'organe mobile 11 est réalisé à partir d'un matériau rigide. La première portion 9 de tampon comporte une surface de contact pour sa coopération avec le cliché 1 et la lentille 5, cette surface étant dénommée "première surface" 12. De même, la deuxième portion 10 de tampon comporte une surface de contact dénommée "deuxième surface" 13. La première surface 12 et la deuxième surface 13 forment ensemble une surface d'encrage 14. La première portion 9 de tampon et la deuxième portion 10 de tampon ont par ailleurs une forme complémentaire de sorte que, lorsque ces deux éléments sont disposés l'un contre l'autre (ce qui est le cas sur la figure 3), la première surface 12 et la deuxième surface 13 se situent dans le prolongement l'une de l'autre pour former une surface d'encrage 14 continue. Sur la figure 4, à l'inverse, l'organe mobile 11 ayant été déplacé, la deuxième portion 10 de tampon est écartée de la première portion 9 de tampon de sorte que la surface d'encrage 14 est ici discontinue. La vue éclatée de la figure 5 montre le mécanisme permettant le déplacement de l'organe mobile 11. Le support 8 est en effet rattaché à un châssis 15 par un jeu d'entretoises 16. Le châssis 15 est ainsi disposé parallèlement et en vis-à-vis du support 8. Sur ce châssis 15, sont disposés deux vérins 17, 18 munis chacun de leur tige mobile 19, 20 dont l'extrémité est fixée à l'organe mobile 11. Notons que sur cette figure 5, pour des raisons d'agencement de la vue éclatée, l'organe mobile 11 a été représenté en deux parties séparées selon une coupe horizontale. L'organe mobile 11 se présente en réalité tel que sur la figure 3. Il est composé de deux parois 21 , 22 parallèles et maintenues en vis-à-vis par deux entretoises 23 (la coupe fictive de la figure 5 intervient au niveau des entretoises 23). Le châssis 15 reçoit en outre un jeu de trois cames 24 chacune montée tournante autour d'un axe perpendiculaire au châssis 15. Deux de ces cames 24 sont destinées à coopérer avec l'un des bords de la paroi 21 tandis que la troisième came 24 est destinée à coopérer avec le bord adjacent de cette paroi 21 , conformément à la figure 5. Chacune des cames 24 est commandée en rotation par un moteur (non représenté). Sur le châssis 15 sont de plus fixées trois butées fixes 25 disposées de la même manière que les cames 24 mais de l'autre côté de la paroi 21 de l'organe mobile 11. L'organe mobile 11 peut ainsi être déplacé entre une première position extrême dans laquelle la paroi 21 est disposée contre les butées fixes 25, et une deuxième position extrême dans laquelle la paroi 21 est disposée, grâce aux vérins 17, 18, contre les cames 24 qui forment des butées réglables. Les figures 6 à 11 se rapportent à un tampon selon un autre mode de réalisation que celui représenté aux figures 3 à 5, seules les formes extérieures de la première portion 9 de tampon et de la deuxième portion 10 de tampon ayant été modifiées. La numérotation établie jusqu'à présent s'applique également à ce mode de réalisation fonctionnellement identique au précédent. La figure 6 montre le tampon 7 dans une position correspondant à celle de la figure 3, la deuxième portion 10 de tampon étant disposée contre la première portion 9 de tampon. L'organe mobile 11 est alors disposé contre les butées fixes 25. La figure 7 quant à elle montre le tampon 7 dans une position correspondant à celle de la figure 4, la deuxième portion 10 de tampon étant écartée de la première portion 9 de tampon. L'organe mobile 11 est alors disposé contre les cames 24. Les éléments décrits précédemment fonctionnent de la manière indiquée ci-après. Sur les figures 8 à 11 , le cliché 1 , la lentille 5 et le tampon 7 sont agencés au sein d'une machine d'impression non représentée qui est bien connue dans ce type d'application. Le cliché 1 et la lentille 5 sont respectivement mis en position sur des supports mobiles en translation latérale tandis que le tampon 7 est mobile. en translation verticale. En référence à la figure 8, le cliché 1 subit tout d'abord le passage d'un encreur 26 destiné à remplir d'encre les gravures 4 du cliché 1. L'encreur 26 est un réservoir sans fond qui, lorsqu'il est appliqué contre la surface 2 du cliché 1 , peut contenir de l'encre 27. Le rebord de l'encreur 26 adjacent au cliché 1 est formé d'une racle 28 s'étendant sur tout le pourtour de l'encreur 26. L'encreur 26 est maintenu fixe contre le cliché 1 tandis que celui-ci, de la position de la figure 8 à la position de la figure 9, est translaté latéralement de sorte que l'encreur 26 soit disposé dans la zone d'encrage 3 du cliché 1 (figure 8) pour ensuite se retrouver au niveau de la surface 2 du cliché 1 (figure 9). Ceci permet aux gravures 4 de se remplir d'encre 27, l'encre étant ensuite raclée par le racleur 28 de manière à éliminer l'encre de la surface de la zone d'encrage 3 pour n'en laisser que dans les gravures 4. Le tampon est ensuite abaissé contre la zone d'encrage 3 (figure 9). Notons que sur cette figure 9 le tampon 7 est disposé contre le cliché 1 lorsqu'il est dans sa position correspondant à la figure 7 mais qu'il peut indifféremment subir cette opération alors qu'il est dans la position correspondant à celle de la figure 6. La figure 10 montre l'étape suivante au cours de laquelle le tampon 7 est relevé et le cliché 1 est translaté pour libérer l'espace disponible sous le tampon 7. Le tampon 7 présente alors sur sa première surface 12 et sa deuxième surface 13 les motifs encrés 29 formés préalablement par les gravures 4 du cliché 1 et qui ont maintenant adhéré au tampon 7. La figure 7 montre ces motifs encrés 29. Le tampon 7 comportant les motifs encrés 29 forme un tampon encré. Ce tampon peut alors être réglé en fonction des positions relatives que l'on souhaite donner aux marquages 6 lorsqu'ils seront réalisés sur la lentille 5. Par exemple, dans le cas des figures 6 et 7, le cliché 1 et le tampon 7 sont prévus pour que, lors de l'étape de la figure 9, un ensemble de motifs encrés 29 soit disposé sur la première surface 12 tandis qu'un seul motif encré 29, correspondant dans notre exemple à la zone de mesure de la vision de près d'une lentille progressive, est disposé sur la deuxième surface 13. Au cours de l'étape correspondant à la figure 10, les cames 24 sont commandées pour former des butées telles que, lorsque l'organe mobile 11 est disposé contre ces butées, la deuxième surface 13 (et par conséquent les motifs 29 qu'elle porte) et la première surface 12 (et par conséquent les motifs 29 qu'elle porte) sont dans la position relative désirée pour le type de lentille 5 prévu. Les vérins 17, 18 sont alors commandés pour disposer l'organe mobile 11 contre les cames 24 et réaliser ainsi la mise en position. Notons que le réglage des cames 24 peut être effectué en temps masqué, par exemple lors des étapes correspondant aux figures 8 et 9. L'étape de la figure 11 correspond à l'impression proprement dite des motifs sur la lentille 5. Pour cela, la lentille 5 est translatée sous le tampon 7, ce dernier étant abaissé contre la surface de la lentille ophtalmique 5 pour y déposer les motifs encrés 29 qui deviendront sur la lentille 5 les marquages 6 visibles à la figure 2. L'aptitude des cames 24 à former des butées mobiles ainsi que la possibilité de déplacement de l'organe mobile 11 permettent ainsi de former sur une lentille 5 des marquages 6 dont les éléments unitaires proviennent des gravures 4 du cliché 1 mais qui ont été agencés en fonction du type de lentille particulier. Les figures 12 et 13 se rapportent à un mode de réalisation alternatif du tampon 7. La numérotation établie précédemment est conservée pour les éléments de même fonction. La figure 12 montre un tampon 7 dont la deuxième portion 10 de tampon est fixée sur le support 8, comme la première portion 9 de tampon. La deuxième portion 10 de tampon comporte une barre rigide 30 noyée dans le matériau de la deuxième portion 10. Cette barre rigide est de plus articulée dans une rotule 31 fixe par rapport au support 8. L'une des extrémités de la barre 30 est disposée à proximité de la deuxième surface 13 tandis que l'autre de ces extrémités, au-delà de la rotule 31 , est reliée par une articulation 32 à deux barres transversales rigides 33 elles-mêmes reliées aux tiges 19, 20 de deux vérins fixés sur le support 8. Sur les figures 12 et 13, seule l'extrémité des tiges 19, 20 des vérins a été représentée pour plus de clarté. Lorsque le tampon 7 est dans la position de la figure 12, son agencement correspond à celui du tampon de la figure 3, les tiges 19, 20 des vérins étant sorties. Pour se placer dans la configuration correspondant à celle de la figure 4, c'est-à-dire pour écarter la deuxième surface 13 de la première surface 12, les tiges 19, 20 des vérins sont rentrées, ce qui entraîne le pivotement de la barre 30 autour de la rotule 31 et par conséquent le déplacement de l'extrémité de la barre 30 proche de la deuxième surface 13 dans le sens opposé à la première portion 9 de tampon. Les figures 14 à 16 illustrent un autre mode de réalisation du procédé selon l'invention. Un cliché 34 (voir figure 14) est tout d'abord préparé pour l'encrage d'un tampon 35 (voir figure 15). Ce cliché 34 comporte une zone A de gravures dites « communes » ainsi que des zones B, C et D, de gravures dites « spécifiques ». Ce cliché 34 permet d'appliquer sur trois types différents de lentilles respectivement un premier type de marquage correspondant à la zone commune A associée avec la zone spécifique B, un second type de marquage correspondant à la zone commune A associée à la zone spécifique C, et un troisième type de marquage correspondant à la zone commune A associée à la zone spécifique D. Ce seul cliché 34 permet ainsi le marquage de lentilles différentes par sélection parmi des zones spécifiques à associer à une zone commune. Après le passage d'un encreur sur le cliché de la figure 14 de manière similaire aux modes de réalisation précédents, un tampon 35 subit une phase de configuration au cours de laquelle sa première portion 36 et sa deuxième portion 37 sont mises en position l'une par rapport à l'autre, de manière que la première portion 36 puisse être encrée par les gravures de la zone A, tandis que la deuxième portion 37 puisse être encrée uniquement par l'une des zones spécifiques. Dans l'exemple de la figure 15, il s'agit de la zone spécifique C. La figure 15 illustre l'opération d'encrage du tampon 35 en montrant ce dernier disposé contre le cliché 34, les gravures des zones A et C, qui permettent d'encrer le tampon 35, étant représentées en pointillés à travers le tampon 35. Le tampon 35 ayant successivement subi une étape de configuration puis une étape d'encrage, subit par la suite une étape de transformation pour aboutir à la position de la figure 16. La figure 16 est une vue de dessus du tampon 35 encré (les motifs qu'il porte étant représentés à travers le tampon 35 en pointillés) qui, après cette étape de transformation, présente un agencement prédéterminé des motifs correspondant à la zone A relativement aux motifs correspondant à la zone C. Dans cette position, le tampon 35 peut alors être appliqué sur une lentille ophtalmique de la même manière que pour les modes de réalisation décrits précédemment. De même que pour l'exemple des figures 15 et 16 relatif à la zone C, le tampon 35 peut subir une étape de configuration dans laquelle la deuxième portion 37 sera disposée en vis-à-vis de la zone B ou D, ou de tout autre groupe de gravures sélectionnées du cliché 34 pour ensuite revenir, par l'étape de transformation, au tampon 35 encré de la figure 16 dont la deuxième portion 37 portera dans ce cas d'autres motifs. La modularité du tampon 35 étant exploitée aussi bien pour l'encrage du tampon 35 que pour l'application des motifs sur la lentille ophtalmique, un grand nombre de marquages prédéterminés différents peut être appliqué sur des lentilles différentes à partir d'un même cliché 34. Des variantes de réalisation du dispositif décrit peuvent être envisagées sans pour autant sortir du cadre de l'invention. Notamment, les différents éléments peuvent être mis en œuvre au sein d'une machine d'impression différente de celle décrite relativement aux figures 8 à 11. De même, d'autres types de marquages 6 que ceux décrits peuvent être réalisés. The invention relates to the general field of the marking of ophthalmic lenses. It relates more particularly to a method and a device for depositing ink on an ophthalmic lens according to predetermined forms. The manufacturing methods generally employed to obtain a finished and shaped lens-shaped ophthalmic lens typically include steps in which the ophthalmic lens receives markings on its surface. For example, the lens may receive points or crosses identifying a particular point (for example the optical center of the ophthalmic lens), centerlines (for example to indicate the axis in which the astigmatism is corrected), shapes defining a particular zone (for example, near vision zone or far vision zone in the case of progressive ophthalmic lenses). Similarly, it may be necessary to make markings relating to the identification of the ophthalmic lens or other commercial markings. Among the various technologies making it possible to make a mark appear on the surface of an ophthalmic lens, marking with the aid of an inked stamp applied to said surface is commonly used for its low cost of implementation and its marking accuracy. . Methods of depositing ink on an ophthalmic lens, in which an ophthalmic lens is placed on a support, are thus known in the vicinity of a plate comprising engravings reproducing the shapes to be printed on the lens, this plate being commonly called "cliche". The snapshot and the ophthalmic lens are both accessible to an elastically deformable tampon, generally made of silicone. The stamp is first applied to the surface of the plate when the latter has been previously inked (that is to say that the prints of the plate have been filled) thanks to ink). The pad is then removed from the surface of the plate, the ink contained in the etchings adhering to the pad to form an inked pad. The inked pad is then applied to the surface of the ophthalmic lens that is to be marked and the ink arranged according to the engravings of the plate is then transferred from the pad to the surface of the ophthalmic lens. Document US 2003/0107704 discloses a method for printing markings on a progressive ophthalmic lens. This method provides for depositing on an ophthalmic lens a pattern which comprises a graduated portion. This method thus makes it possible to print the same pattern on progressive ophthalmic lenses of different characteristics. The graduations then make it possible to identify the particular points specific to each type of lens. Thanks to this method, it is therefore not necessary to have a specific marking for each of the types of progressive ophthalmic lenses. The object of the invention is to improve this type of printing process of an ophthalmic lens. For this purpose, the invention provides a method for marking an ophthalmic lens according to predetermined patterns, this process comprising the following steps: providing a plate comprising engravings reproducing said predetermined patterns according to a first arrangement; filling said engravings with a marking ink; - applying a stamp on the etchings of said plate so that the ink contained in the etchings adheres to the pad to form an ink pad bearing said patterns according to the first arrangement; - Applying the inked stamp on an ophthalmic lens so as to deposit the ink arranged according to said predetermined patterns; this method being characterized in that it comprises a preliminary step of preparation of the buffer so as to delimit at least two inking portions movable relative to each other and in that it comprises in furthermore, between the step of applying the stamp on the plate and the step of applying the stamp inked on the lens, a transformation step during which the arrangement of the inking portions by relative displacement of said elements is modified; inking portions so as to determine a second arrangement of said patterns whereby the patterns are deposited on the lens according to the second arrangement. Such a method allows, from a single shot, in a single application of the buffer on the ophthalmic lens, print different sizes or pattern shapes from an initial pattern of the shot. One and the same shot can be used for printing lenses of different characteristics. For example, each type of progressive ophthalmic lens corresponds to a specific marking in which the marking identifying the far vision zone has a very precise positioning relative to the marking identifying the near vision zone. If the "far vision" marking is carried by one of the portions of the buffer surface and the "near vision" marking is carried by another portion of the buffer surface, the relative position of these two markings may be set for each type of ophthalmic lens. Each lens receives the marking which is specific to it and not a graduated universal marking which requires a later step of reading the graduations. This method can be implemented according to the following preferred characteristics: the relative displacement of said inking portions is carried out by moving one of the inking portions with the aid of an actuator; the second arrangement of the patterns is determined by placing one of the inking portions in position against stops; - The method further comprises a step of adjusting said stops before the positioning of said inking portion; said step of adjusting the stops is carried out simultaneously with other steps; during the step of applying the stamp to the engravings, the inking of the stamp is carried out by all of the said engravings. According to one embodiment, the marking method furthermore comprises, between the step of filling the etchings and the step of applying the stamp on the etchings, a configuration step during which the layout of the portions is modified. inking by relative displacement of said inking portions so as to present a predetermined inking arrangement of said patterns whereby the patterns carried by the inked pad are arranged according to said inking arrangement. During the step of applying the stamp to the engravings, the inking of the stamp may be carried out only by a part of said engravings, said inking arrangement of the stamp allowing selection of the engravings for inking the stamp. A method according to this embodiment allows the use of a plate having an engraving area common to different predetermined patterns as well as specific engraving areas. Before inking the stamp, the two inking portions are first positioned relative to each other so that said common engraving area comes to ink one of the inking portions while specific area chosen inked the other portion of inking. After inking, the transformation step allows the buffer to reconstitute the predetermined patterns to be applied to a lens. A single image having a common inking area and specific inking areas can thus be used, instead of a multitude of specific shots, to deposit on different lenses different patterns having a common area. The invention also relates to a device for marking an ophthalmic lens according to predetermined patterns, this device being suitable for implementing the method described above and comprising: a support for receiving a plate provided with engravings reproducing said predetermined patterns in a first arrangement; a support for receiving an ophthalmic lens; - An inking device of the plate; a buffer comprising an inking surface by which it is intended to come selectively opposite the first support in an inking position or the second support in a marking position; this device being characterized in that the buffer comprises at least two inking portions movable relative to each other and in that a displacement control member is provided for moving said inking portions between the position inking and the marking position, whereby the stamp is adapted to be inked according to said patterns arranged according to the first arrangement, said patterns being adapted to be arranged in a second arrangement in the marking position. The device can also be implemented with the following preferred characteristics: a first of said inking portions is connected to a first rigid member and a second of said inking portions is connected to a second rigid member, the first rigid member and the second rigid member being adapted to be moved relative to each other, and in that said moving control member acts on at least one of the rigid members; - The first inking portion is mounted on a fixed support and the second inking portion is mounted on a movable support; the mobile support is adapted to be controlled by an actuator; the mobile support is adapted to cooperate with fixed stops; the mobile support is adapted to cooperate with movable stops; - The first inking portion and the second inking portion are mounted on the same fixed support, the second portion being made of an elastically deformable material and being connected to a rigid bar movable relative to said fixed support; said rigid bar is attached to the fixed support by a ball joint; said rigid bar is adapted to be controlled by an actuator; and - The first inking portion and the second inking portion are silicone. Other features and advantages of the invention appear in the light of the description which follows of a preferred embodiment given by way of non-limiting example, description made with reference to the accompanying drawings in which: - Figure 1 represents a cliché seen from above comprising visible engravings; FIG. 2 is an ophthalmic lens viewed from above after markings have been printed on its surface from the plate of FIG. 1; FIG. 3 is a perspective view of a buffer according to the invention; - Figure 4 is a view similar to Figure 3, a portion of the buffer has been removed from the rest of the buffer; - Figure 5 is an exploded view of the buffer of Figures 3 and 4; - Figures 6 and 7 are top views of a buffer according to an alternative embodiment of the invention, the buffer being respectively in a first and a second position; - Figures 8 to 11 are schematic side views showing successive steps of marking an ophthalmic lens according to the invention; FIG. 12 is a perspective view of a buffer according to an alternative embodiment of the invention; and Fig. 13 is a perspective view of the pad of Fig. 12 with a portion of the pad removed from the remainder of the pad; - Figure 14 shows, in top view, a plate provided for the implementation of the method according to another embodiment of the invention. FIG. 15 represents the step of inking a stamp by the plate of FIG. 14; FIG. 16 is a view of the stamp of FIG. 15 after the transformation step. Figure 1 shows the surface of an inking plate 1 intended to cooperate with a buffer, this plate is commonly called "cliché". This plate 1 comprises a flat and smooth surface 2 (that visible in this FIG. 1), possibly varnished, and which comprises an inking area 3. At this inking area 3, etchings 4 are made on the surface 2. Each pattern visible on the plate 1 of Figure 1 corresponds to one of these etchings 4 and can be performed, for example, by machining or chemical removal of material. Figure 2 represents an ophthalmic lens 5 seen from above. This lens 5 is, in the present example, a raw lens that has not yet been cut off, that is to say machined to the shape of a particular frame, which explains its circular shape. The ophthalmic lens 5 comprises on one of its faces markings 6 made in ink and reproducing the arrangement of the engravings 4 of the plate 1 of FIG. 1. The ophthalmic lens 5 has indeed received the markings 6 by the application a buffer previously inked on the inking area 3 of the plate 1, according to the method explained below. FIG. 3 represents a buffer 7 adapted to be inked by the plate 1 and to deposit the ink on the lens 5. The pad 7 comprises a support 8 on which is fixed a first portion 9 of buffer made from a material elastically deformable and adapted to ink printing such as, for example, silicone. The buffer 7 further comprises a second portion 10 of buffer attached to a movable member 11. The second portion 10 of buffer is made of the same material as the first portion 9 while the movable member 11 is made from a material rigid. The first buffer portion 9 comprises a contact surface for its cooperation with the plate 1 and the lens 5, this surface being called "first surface" 12. Likewise, the second buffer portion 10 has a contact surface called "second surface". surface "13. The first surface 12 and the second surface 13 together form an inking surface 14. The first buffer portion 9 and the second buffer portion 10 also have a complementary shape so that when these two elements are arranged one against the other (which is the case in Figure 3), the first surface 12 and the second surface 13 are in the extension of one another to form a continuous inking surface 14. In Figure 4, conversely, the movable member 11 has been moved, the second portion 10 of buffer is spaced from the first portion 9 of buffer so that the inking surface 14 is here discontinuous. The exploded view of FIG. 5 shows the mechanism allowing displacement of the movable member 11. The support 8 is in fact attached to a frame 15 by a set of spacers 16. The frame 15 is thus arranged in parallel and facing With respect to the support 8. On this chassis 15, two cylinders 17, 18 are each provided with their movable rod 19, 20 whose end is fixed to the movable member 11. Note that in this FIG. For reasons of arrangement of the exploded view, the movable member 11 has been shown in two separate parts in a horizontal section. The movable member 11 is actually as in Figure 3. It is composed of two walls 21, 22 parallel and held vis-a-vis by two spacers 23 (the imaginary section of Figure 5 occurs at the level of spacers 23). The frame 15 further receives a set of three cams 24 each mounted rotatably about an axis perpendicular to the frame 15. Two of these cams 24 are intended to cooperate with one of the edges of the wall 21 while the third cam 24 is intended to cooperate with the adjacent edge of this wall 21, in accordance with Figure 5. Each of the cams 24 is rotated by a motor (not shown). On the frame 15 are further fixed three fixed stops 25 arranged in the same way as the cams 24 but on the other side of the wall 21 of the movable member 11. The movable member 11 can thus be moved between a first end position in which the wall 21 is disposed against the fixed stops 25, and a second end position in which the wall 21 is arranged, thanks to the jacks 17, 18, against the cams. 24 which form adjustable stops. Figures 6 to 11 refer to a buffer according to another embodiment than that shown in Figures 3 to 5, only the outer shapes of the first buffer portion 9 and the second buffer portion 10 having been modified. The numbering established up to now also applies to this embodiment functionally identical to the previous one. FIG. 6 shows the buffer 7 in a position corresponding to that of FIG. 3, the second buffer portion being disposed against the first buffer portion 9. The movable member 11 is then disposed against the fixed stops 25. FIG. 7 for its part shows the buffer 7 in a position corresponding to that of FIG. 4, the second buffer portion being separated from the first buffer portion 9. . The movable member 11 is then arranged against the cams 24. The elements described above operate as indicated below. In FIGS. 8 to 11, the plate 1, the lens 5 and the pad 7 are arranged in a printing machine (not shown) which is well known in this type of application. The plate 1 and the lens 5 are respectively placed in position on movable supports in lateral translation while the pad 7 is movable. in vertical translation. With reference to FIG. 8, the plate 1 first undergoes the passage of an inker 26 intended to fill the etchings 4 of the plate 1 with ink. The inker 26 is a bottomless tank which, when it is applied against the surface 2 of the plate 1, may contain ink 27. The edge of the inker 26 adjacent to the plate 1 is formed of a doctor blade 28 extending around the entire periphery of the inker 26. inking 26 is held fixed against the plate 1 while the latter, from the position of Figure 8 to the position of Figure 9, is translated laterally so that the inker 26 is disposed in the inking area 3 of the plate 1 (Figure 8) and then be found at the surface 2 of the plate 1 (Figure 9). This allows the engravings 4 to fill with ink 27, the ink then being scraped by the scraper 28 so as to eliminate the ink from the surface of the inking area 3 to leave only in the engravings 4 The pad is then lowered against the inking zone 3 (FIG. Note that in this Figure 9 the buffer 7 is arranged against the plate 1 when in its position corresponding to Figure 7 but can indifferently undergo this operation while it is in the position corresponding to that of Figure 6. Figure 10 shows the next step during which the buffer 7 is raised and the plate 1 is translated to free the space available under the buffer 7. The buffer 7 then has on its first surface 12 and its second surface 13 the inked patterns 29 previously formed by the etchings 4 of the plate 1 and which have now adhered to the stamp 7. Figure 7 shows these inked patterns 29. The stamp 7 comprising the inked patterns 29 forms an inked stamp. This buffer can then be adjusted according to the relative positions that it is desired to give the markings 6 when they are made on the lens 5. For example, in the case of FIGS. 6 and 7, the plate 1 and the buffer 7 are provided for that, in the step of Figure 9, a set of inked patterns 29 is disposed on the first surface 12 while a single inked pattern 29, corresponding in our example to the measurement area of the near vision a progressive lens, is disposed on the second surface 13. During the step corresponding to Figure 10, the cams 24 are controlled to form stops such that, when the movable member 11 is disposed against these stops, the second surface 13 (and therefore the patterns 29 it carries) and the first surface 12 (and therefore the patterns 29 it carries) are in the desired relative position for the intended lens type. The cylinders 17, 18 are then controlled to arrange the movable member 11 against the cams 24 and thus perform the setting. Note that the adjustment of the cams 24 can be performed in masked time, for example during the steps corresponding to FIGS. 8 and 9. The step of FIG. 11 corresponds to the actual printing of the patterns on the lens 5. For this, the lens 5 is translated under the pad 7, the latter being lowered against the surface of the ophthalmic lens 5 to deposit the inked patterns 29 which will become on the lens 5 the markings 6 visible in Figure 2. The ability of the cams 24 to form movable stops and the possibility of displacement of the movable member 11 thus make it possible to form on a lens 5 markings 6 whose unitary elements come from the engravings 4 of the plate 1 but which have been arranged according to the type of lens particular. Figures 12 and 13 relate to an alternative embodiment of the buffer 7. The numbering previously established is retained for elements of the same function. FIG. 12 shows a buffer 7 whose second buffer portion 10 is fixed on the support 8, like the first buffer portion 9. The second portion 10 of buffer comprises a rigid bar 30 embedded in the material of the second portion 10. This rigid bar is further articulated in a ball 31 fixed relative to the support 8. One end of the bar 30 is disposed near the second surface 13 while the other of these ends, beyond the ball 31, is connected by a hinge 32 to two rigid transverse bars 33 themselves connected to the rods 19, 20 of two jacks fixed on 8. In Figures 12 and 13, only the end of the rods 19, 20 of the cylinders has been shown for clarity. When the pad 7 is in the position of Figure 12, its arrangement corresponds to that of the pad of Figure 3, the rods 19, 20 of the cylinders being output. To move into the configuration corresponding to that of Figure 4, that is to say to separate the second surface 13 of the first surface 12, the rods 19, 20 of the cylinders are retracted, which causes the pivoting of the bar 30 around the ball 31 and therefore the movement of the end of the bar 30 near the second surface 13 in the opposite direction to the first portion 9 of buffer. Figures 14 to 16 illustrate another embodiment of the method according to the invention. A snapshot 34 (see Fig. 14) is first prepared for inking a tampon 35 (see Fig. 15). This plate 34 comprises a zone A of so-called "common" engravings as well as zones B, C and D, of so-called "specific" engravings. This plate 34 makes it possible to apply on three different types of lenses respectively a first type of marking corresponding to the common area A associated with the specific area B, a second type of marking corresponding to the common area A associated with the specific area C, and a third type of marking corresponding to the common area A associated with the specific area D. This single plate 34 thus allows the marking of different lenses by selection from specific areas to be associated with a common area. After the passage of an inker on the plate of FIG. 14 in a manner similar to the previous embodiments, a buffer 35 undergoes a configuration phase during which its first portion 36 and its second portion 37 are placed in position. one relative to the other, so that the first portion 36 can be inked by the engravings of the area A, while the second portion 37 can be inked only by one of the specific areas. In the example of FIG. 15, this is the specific area C. FIG. 15 illustrates the inking operation of the stamp 35 by showing the latter disposed against the plate 34, the engravings of the zones A and C, which enable the stamp 35 to be inked, being represented in dashed lines through the buffer 35. The buffer 35 having successively undergone a configuration step and then an inking step, is subsequently subjected to a transformation step to arrive at the position of Figure 16. FIG. 16 is a top view of the ink pad 35 (the patterns it bears being shown through the dotted pad) which, after this processing step, has a predetermined pattern of patterns corresponding to the area A relative to In this position, the pad 35 can then be applied to an ophthalmic lens in the same manner as for the previously described embodiments. As for the example of FIGS. 15 and 16 relating to the zone C, the buffer 35 may undergo a configuration step in which the second portion 37 will be disposed opposite the zone B or D, or any other group of selected etchings of the plate 34 and then return, by the transformation step, to the ink pad 35 of Figure 16, the second portion 37 will in this case other patterns. The modularity of the buffer 35 being exploited both for the inking of the pad 35 and for the application of the patterns on the ophthalmic lens, a large number of different predetermined markings can be applied to different lenses from the same plate. Alternative embodiments of the device described can be envisaged without departing from the scope of the invention. In particular, the various elements can be implemented in a printing machine different from that described with reference to FIGS. 8 to 11. Likewise, other types of markings 6 than those described can be made.

Claims

REVENDICATIONS
1. Procédé de marquage d'une lentille ophtalmique selon des motifs prédéterminés, ce procédé comportant les étapes suivantes : - fourniture d'une plaque (1 ) comportant des gravures (4) reproduisant lesdits motifs prédéterminés selon un premier agencement ; remplissage desdites gravures (4) par une encre de marquage ; application d'un tampon (7) sur les gravures (4) de ladite plaque (1 ) de sorte que l'encre contenue dans les gravures (4) adhère au tampon (7) pour former un tampon (7) encré portant lesdits motifs selon le premier agencement ; application du tampon (7) encré sur une lentille ophtalmique (5) de manière à y déposer l'encre disposée selon lesdits motifs prédéterminés ; ce procédé étant caractérisé en ce qu'il comporte une étape préalable de préparation du tampon (7) en sorte de délimiter au moins deux portions d'encrage (12, 13) mobiles l'une par rapport à l'autre et en ce qu'il comporte en outre, entre l'étape d'application du tampon (7) sur la plaque (1) et l'étape d'application du tampon (7) encré sur la lentille (5), une étape de transformation au cours de laquelle on modifie l'agencement des portions d'encrage (12, 13) par déplacement relatif desdites portions d'encrage (12, 13) en sorte de déterminer un deuxième agencement desdits motifs grâce à quoi les motifs sont déposés sur la lentille (5) selon le deuxième agencement. 1. A method of marking an ophthalmic lens according to predetermined patterns, this method comprising the following steps: - providing a plate (1) having engravings (4) reproducing said predetermined patterns according to a first arrangement; filling said engravings (4) with a marking ink; applying a stamp (7) on the engravings (4) of said plate (1) so that the ink contained in the engravings (4) adheres to the stamp (7) to form a stamp (7) inked bearing said patterns according to the first arrangement; applying the stamp (7) inked on an ophthalmic lens (5) so as to deposit the ink disposed in said predetermined patterns; this method being characterized in that it comprises a preliminary step of preparing the buffer (7) so as to delimit at least two inking portions (12, 13) movable relative to each other and in that it furthermore comprises, between the step of applying the buffer (7) to the plate (1) and the step of applying the stamp (7) inked on the lens (5), a step of transformation during of which the arrangement of the inking portions (12, 13) is changed by relative displacement of said inking portions (12, 13) so as to determine a second arrangement of said patterns whereby the patterns are deposited on the lens ( 5) according to the second arrangement.
2. Procédé selon la revendication 1 , caractérisé en ce que le déplacement relatif desdites portions d'encrage (12, 13) est effectué en déplaçant l'une des portions d'encrage (13) à l'aide d'un actionneur (17, 18). 2. Method according to claim 1, characterized in that the relative displacement of said inking portions (12, 13) is effected by moving one of the inking portions (13) with the aid of an actuator (17). , 18).
3. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que le deuxième agencement des motifs est déterminé grâce à la mise en position de l'une des portions d'encrage (10, 11 , 13) contre des butées (24). 3. Method according to one of claims 1 or 2, characterized in that the second arrangement of the patterns is determined by the setting in position of one of the inking portions (10, 11, 13) against stops ( 24).
4. Procédé selon la revendication 3, caractérisé en ce qu'il comporte en outre une un étape de réglage desdites butées (24) avant la mise en position de ladite portion d'encrage (10, 11 , 13). 4. Method according to claim 3, characterized in that it further comprises a step of adjusting said stops (24) before the positioning of said inking portion (10, 11, 13).
5. Procédé selon la revendication 4, caractérisé en ce que ladite étape de réglage des butées (24) est effectuée simultanément à d'autres étapes. 5. Method according to claim 4, characterized in that said step of adjusting the stops (24) is performed simultaneously with other steps.
6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que, lors de l'étape d'application du tampon (7) sur les gravures (4), l'encrage du tampon (7) est réalisé par la totalité desdites gravures (4). 6. Method according to one of claims 1 to 5, characterized in that, during the step of applying the stamp (7) on the engravings (4), the inking of the stamp (7) is carried out by the all of said engravings (4).
7. Procédé selon l'une des revendications 1 à 5, caractérisé en ce qu'il comporte en outre, entre l'étape de remplissage des gravures et l'étape d'application du tampon (35) sur les gravures, une étape de configuration au cours de laquelle on modifie l'agencement des portions d'encrage (36, 37) par déplacement relatif desdites portions d'encrage (36, 37) en sorte de présenter un agencement d'encrage prédéterminé desdits motifs grâce à quoi les motifs portés par le tampon (35) encré sont disposés selon ledit agencement d'encrage. 7. Method according to one of claims 1 to 5, characterized in that it further comprises, between the step of filling etchings and the step of applying the buffer (35) on the etchings, a step of a configuration in which the arrangement of the inking portions (36, 37) is changed by relative movement of said inking portions (36, 37) so as to present a predetermined inking arrangement of said patterns whereby the patterns carried by the stamp (35) inked are arranged according to said inking arrangement.
8. Procédé selon la revendication 7, caractérisé en ce que, lors de l'étape d'application du tampon (35) sur les gravures, l'encrage du tampon (35) n'est réalisé que par une partie desdites gravures, ledit agencement d'encrage du tampon (35) permettant une sélection des gravures pour l'encrage du tampon (35). 8. Method according to claim 7, characterized in that, during the step of applying the stamp (35) on the engravings, the inking of the stamp (35) is carried out only by a part of said engravings, said inking arrangement of the stamp (35) allowing selection of engravings for inking the stamp (35).
9. Dispositif de marquage d'une lentille ophtalmique selon des motifs prédéterminés, ce dispositif convenant à la mise en œuvre du procédé selon l'une des revendications 1 à 8 et comportant : un support pour recevoir une plaque (1) munie de gravures (4) reproduisant lesdits motifs prédéterminés selon un premier agencement ; - un support pour recevoir une lentille ophtalmique (5) ; un dispositif d'encrage (26) de la plaque (1 ) ; un tampon (7) comportant une surface d'encrage (14) par laquelle il est destiné à venir sélectivement en regard du premier support dans une position d'encrage ou du deuxième support dans une position de marquage ; ce dispositif étant caractérisé en ce que le tampon (7) comporte au moins deux portions d'encrage (12, 13) mobiles l'une par rapport à l'autre et en ce qu'un organe de commande en déplacement (17, 18) est prévu pour déplacer lesdites portions d'encrage (12, 13) entre la position d'encrage et la position de marquage, grâce à quoi le tampon (7) est adapté à être encré selon lesdits motifs disposés selon Ie premier agencement, lesdits motifs étant adaptés à être disposés selon un deuxième agencement dans la position de marquage. 9. Apparatus for marking an ophthalmic lens in predetermined patterns, this device suitable for implementing the method according to one of claims 1 to 8 and comprising: a support for receiving a plate (1) provided with engravings ( 4) reproducing said predetermined patterns according to a first arrangement; a support for receiving an ophthalmic lens (5); an inking device (26) for the plate (1); a stamp (7) having an inking surface (14) by which it is intended to come selectively opposite the first support in an inking position or the second support in a marking position; this device being characterized in that the buffer (7) comprises at least two inking portions (12, 13) movable relative to each other and in a displacement control member (17, 18) is provided for moving said inking portions (12, 13) between the inking position and the marking position, whereby the buffer (7) is adapted to be inked according to said patterns arranged according to the first arrangement, said patterns being adapted to be arranged in a second arrangement in the marking position.
10. Dispositif selon la revendication 9, caractérisé en ce qu'une première (12) desdites portions d'encrage est reliée à un premier organe rigide (8) et une deuxième (13) desdites portions d'encrage est reliée à un deuxième organe rigide (11 , 30), le premier organe rigide (8) et le deuxième organe rigide (11 , 30) étant adaptés à être déplacés l'un par rapport à l'autre, et en ce que ledit organe de commande en déplacement (17, 18) agit sur l'un au moins des organes rigides (8, 11 , 30). 10. Device according to claim 9, characterized in that a first (12) of said inking portions is connected to a first rigid member (8) and a second (13) of said inking portions is connected to a second member rigid (11, 30), the first rigid member (8) and the second rigid member (11, 30) being adapted to be displaced relative to each other, and in that said moving control member ( 17, 18) acts on at least one of the rigid members (8, 11, 30).
11. Dispositif selon la revendication 10, caractérisé en ce que la première portion d'encrage (12) est montée sur un support fixe (8) et la deuxième portion d'encrage est montée sur un support mobile (11 ). 11. Device according to claim 10, characterized in that the first inking portion (12) is mounted on a fixed support (8) and the second inking portion is mounted on a movable support (11).
12. Dispositif selon la revendication 11 , caractérisé en ce que le support mobile (11 ) est adapté à être commandé par un actionneur (17, 18). 12. Device according to claim 11, characterized in that the movable support (11) is adapted to be controlled by an actuator (17, 18).
13. Dispositif selon l'une des revendications 11 ou 12, caractérisé en ce le support mobile (11 ) est adapté à coopérer avec des butées fixes (25). 13. Device according to one of claims 11 or 12, characterized in that the movable support (11) is adapted to cooperate with fixed stops (25).
14. Dispositif selon l'une des revendications 11 à 13, caractérisé en ce le support mobile (11) est adapté à coopérer avec des butées mobiles (24). 14. Device according to one of claims 11 to 13, characterized in that the movable support (11) is adapted to cooperate with movable stops (24).
15. Dispositif selon la revendication 10, caractérisé en ce que la première portion d'encrage (12) et la deuxième portion d'encrage (13) sont montées sur un même support fixe (8), la deuxième portion (13) étant réalisée en un matériau élastiquement déformable et étant reliée à une barre rigide (30) mobile par rapport audit support fixe (8). 15. Device according to claim 10, characterized in that the first inking portion (12) and the second inking portion (13) are mounted on the same fixed support (8), the second portion (13) being realized in an elastically deformable material and being connected to a rigid bar (30) movable relative to said fixed support (8).
16. Dispositif selon la revendication 15, caractérisé en ce que ladite barre rigide (30) est rattachée au support fixe (8) par une rotule (31 ). 16. Device according to claim 15, characterized in that said rigid bar (30) is attached to the fixed support (8) by a ball joint (31).
17. Dispositif selon l'une des revendications 15 ou 16, caractérisé en ce que ladite barre rigide (30) est adaptée à être commandée par un actionneur (19, 20). 17. Device according to one of claims 15 or 16, characterized in that said rigid bar (30) is adapted to be controlled by an actuator (19, 20).
18. Dispositif selon l'une des revendications 8 à 16, caractérisé en ce que la première portion d'encrage (12) et la deuxième portion d'encrage (13) sont en silicone. 18. Device according to one of claims 8 to 16, characterized in that the first inking portion (12) and the second inking portion (13) are silicone.
EP05775557A 2004-06-03 2005-05-31 Method and device for marking an ophthalmic lens Active EP1773593B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0406013A FR2871100B1 (en) 2004-06-03 2004-06-03 METHOD AND DEVICE FOR MARKING AN OPHTHALMIC LENS
PCT/FR2005/001330 WO2006000683A1 (en) 2004-06-03 2005-05-31 Method and device for marking an ophthalmic lens

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EP1773593A1 true EP1773593A1 (en) 2007-04-18
EP1773593B1 EP1773593B1 (en) 2008-07-16

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US (1) US7762183B2 (en)
EP (1) EP1773593B1 (en)
AT (1) ATE401196T1 (en)
DE (1) DE602005008250D1 (en)
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US20080053319A1 (en) * 2006-09-06 2008-03-06 Illinois Tool Works Inc. Pad printing of video targets for strain measurement
TW200812811A (en) * 2006-09-06 2008-03-16 Illinois Tool Works PAD printing of video targets for strain measurement
US8607699B2 (en) * 2008-05-07 2013-12-17 Illinois Tool Works Inc. Rotating cliché pad printer
JP2011138064A (en) * 2009-12-29 2011-07-14 Seiko Epson Corp Vision shift amount measuring method and vision shift amount measuring jig
FR2984500B1 (en) 2011-12-15 2014-01-10 Essilor Int SYSTEM AND METHOD FOR OPTICALLY READING PRINTED MARKS ON A FACE OF AN OPHTHALMIC LENS

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FR2206705A5 (en) * 1972-11-10 1974-06-07 Braud & Faucheux
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DE3436688C1 (en) * 1984-10-05 1986-07-03 TAMPOflex GmbH, 7257 Ditzingen Process for multi-color pad printing
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DE602005008250D1 (en) 2008-08-28
ATE401196T1 (en) 2008-08-15
US20070251401A1 (en) 2007-11-01
FR2871100A1 (en) 2005-12-09
EP1773593B1 (en) 2008-07-16
WO2006000683A1 (en) 2006-01-05
US7762183B2 (en) 2010-07-27
FR2871100B1 (en) 2006-09-22

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