EP1965942A2 - Verschlussvorrichtung für ein optisches element - Google Patents

Verschlussvorrichtung für ein optisches element

Info

Publication number
EP1965942A2
EP1965942A2 EP06847142A EP06847142A EP1965942A2 EP 1965942 A2 EP1965942 A2 EP 1965942A2 EP 06847142 A EP06847142 A EP 06847142A EP 06847142 A EP06847142 A EP 06847142A EP 1965942 A2 EP1965942 A2 EP 1965942A2
Authority
EP
European Patent Office
Prior art keywords
locking device
optical element
deformable bag
deformable
enclosure
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
EP06847142A
Other languages
English (en)
French (fr)
Other versions
EP1965942B1 (de
Inventor
Patrick Herbin
Jean-Marie Keller
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 EP1965942A2 publication Critical patent/EP1965942A2/de
Application granted granted Critical
Publication of EP1965942B1 publication Critical patent/EP1965942B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
    • B25B11/005—Vacuum work holders
    • B25B11/007—Vacuum work holders portable, e.g. handheld
    • 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
    • B24B13/005—Blocking means, chucks or the like; Alignment devices

Definitions

  • the invention relates to the field of manufacturing optical elements such as ophthalmic lenses.
  • the invention more particularly relates to a locking device which can be secured on one of the faces of an optical element in order to maintain this optical element during the machining of its opposite face.
  • the methods making it possible to produce a pair of corrective eyeglasses generally comprise steps for machining and / or polishing the ophthalmic lenses and then mounting these lenses in an eyeglass frame. Some of these machining and / or polishing operations are performed by holding the ophthalmic lens with a locking device secured to one of its faces while a tool operates on the opposite side of the ophthalmic lens.
  • a solution for securing a peg to one of the faces of an ophthalmic lens comprising the use of a metal alloy or low temperature fusible wax.
  • the alloy or wax is first heated to the liquid state and then applied against the ophthalmic lens, which allows to marry the shape.
  • the assembly is then cooled and the metal alloy or wax stiffens to form a pin secured to the ophthalmic lens.
  • An adhesive may also be inserted between the ophthalmic lens and the alloy or wax.
  • DE 39 24 078 discloses a rigid pin subject to an ophthalmic lens by depressurizing the space between the ophthalmic lens and the rigid pin.
  • Document US 6,863,602 describes a pawn having a rigid base on which is fixed a deformable bag filled with a fusible material.
  • the pin is heated to melt the fusible material and is then applied against an ophthalmic lens so that the deformable pocket conforms to the shape of the ophthalmic lens.
  • the assembly is then cooled to cause the curing of the fuse material.
  • the cooling of the fusible material also causes the deformable bag to shrink relative to the ophthalmic lens, thereby creating a depression holding the pin against the ophthalmic lens.
  • a first object of the invention is to provide a locking device for an optical element comprising a rigid base and a deformable pocket attached to the rigid base, characterized in that the deformable pocket contains a granular material and comprises means adapted to allow gaseous exchange between the inside and the outside of the deformable bag, and sealing means arranged to ensure a sealed contact between the deformable bag and an optical element when it is in place against the deformable pocket.
  • Such a locking device allows optimum maintenance of the optical element by marrying the shape of this optical element, thanks to the deformable bag containing a granular material, without the use of consumables such as a metal alloy or a wax that are expensive and present environmental and health hazards.
  • a depression of the space between the optical element and the deformable bag makes it possible to secure the locking device to the optical element and also makes it possible, thanks to the evacuation means, to depressurize the optical element. inside of the deformable pocket to stiffen it.
  • the change in state of the deformable bag which goes from a rigid state to a malleable state and vice versa, therefore does not require a heating / cooling cycle that may damage the optical element.
  • the deformable bag can be sealed to the rigid base.
  • the evacuation means comprise a rigid finger protruding from the rigid base and whose outer portion protrudes outside the deformable bag.
  • Such a rigid finger allows gaseous exchange between the inside and the outside of the deformable bag regardless of the position and shape of the latter.
  • the rigid base is a piece of revolution arranged around a central axis, and the outer portion of the rigid finger extends along this central axis.
  • the rigid base can thus be clamped in the jaws of a conventional polishing machine for optical elements.
  • the rigid finger may comprise a duct extending along its outer portion and opening, on the one hand, to the outside deformable pocket and, secondly, inside the deformable bag so as to ensure gas exchange.
  • the outer portion of the rigid finger can also be porous to ensure this gas exchange.
  • the external section of the rigid finger may comprise a bearing surface for an optical element.
  • the sealing means may comprise a toric lip.
  • sealing means can also be fixed on the deformable bag or be formed directly from an excrescence of the deformable bag.
  • the deformable bag has bracing elements on its outer surface intended to maintain a distance between the deformable bag and an optical element when it is in place against the deformable bag.
  • bracing elements make it possible to guarantee a minimum space between the surface of the optical element and the deformable pocket, whereby a depression can be applied between these two surfaces.
  • bracing elements may for example comprise pins and / or a spirally arranged rib.
  • the granular material may for example advantageously be an incompressible material so that, when a depression is applied inside the deformable bag, the latter clamps the grains against each other, thus forming an indeformable assembly.
  • the granular material may also include irregularly shaped grains and / or grains having facets, so as to prevent or limit the slippage of the grains relative to each other for greater rigidity when a vacuum is applied to the grain. inside the deformable pocket.
  • the granular material may advantageously comprise grains of glass and / or sand.
  • the blocking device may further comprise:
  • an enclosure adapted to receive the rigid base and the deformable pocket, as well as an optical element; and - means for creating a depression inside the enclosure.
  • the device is able to secure an optical element according to the method, which is another object of the invention, comprising the following steps:
  • the method may further comprise, before the step of creating a depression inside the chamber, the step of pressing one of the faces of the optical element against the deformable bag so that the latter at least partially the shape of the optical element.
  • the locking device further comprises means for holding the rigid base inside the enclosure, these holding means being spring-mounted. More specifically, the holding means may comprise a receptacle mounted on a slide and said spring urging the receptacle in the direction of the slide. The optical element can thus be pressed against the deformable bag with a force calibrated by the spring.
  • the locking device may also include a cover provided with means for biasing an optical element against the deformable bag when the rigid base is in place in said holding means, this cover may comprise the retaining means for an optical element.
  • the optical element can be previously put in place on the cover so that the installation of the cover on the enclosure realizes, in a single operation, the closure of the enclosure and the support of the optical element against the deformable pocket.
  • FIG. 1 is a sectional side view of a locking device according to the invention.
  • FIG. 2 shows the locking device of Figure 1 presented vis-à-vis one of the faces of an optical element, itself seen in section;
  • FIG. 3 represents the device of FIG. 2 once it has been subjected to the optical element
  • FIG. 4 is a sectional view of the locking device of Figure 1 further comprising an enclosure adapted to receive an ophthalmic lens;
  • FIG. 5 represents the device of FIG. 4 during a depressurization phase;
  • Figure 1 shows a locking device formed of a pin 1 subject to an optical element.
  • This pin 1 comprises a rigid base 2 and a deformable pocket 3 attached to the rigid base 2.
  • the rigid base 2 is a part of revolution centered around an axis C.
  • This rigid base 2 thus has a shape allowing it to be clamped in the jaws of a machining machine.
  • the rigid base 2 has a frustoconical portion fitting on a certain type of machining machine, it being understood that the shape of the rigid base 2 can be modified to adapt to other types.
  • holding means whether fixed jaws, rotating, movable in translation or holding devices by depression or friction.
  • the rigid base 2 comprises a rigid finger 4 extending along the axis C on the side of the deformable bag 3.
  • the rigid finger 4 comprises, at its end, a flat surface forming a bearing surface 5 for an optical element .
  • the rigid finger 4 further comprises an internal duct 6 opening, on the one hand, at the end of the rigid finger 4, at the level of the bearing surface 5 and, on the other hand, transversely to the rigid finger 4.
  • the rigid base 2 comprises a circular shoulder 7 adapted to cooperate with the holding device or the jaws of the machining machine so that, the dimensions of the rigid base 2 being known, the knowledge of the position of the shoulder 7 with respect to a machine reference, makes it possible to determine the position of the bearing surface 5 with respect to a machine reference.
  • An optical element disposed against the bearing surface 5 is therefore disposed against a reference surface relative to the axes of the intended machining machine. This allows control of the thickness dimension of the lens along the C axis during machining.
  • the position of the optical element is then completely controlled with respect to a machine reference.
  • This rigid base 2 is, in the present example, made of a single piece of steel by molding.
  • this pocket 3 consists of a flexible and waterproof membrane. This is, in this example, a rubber or polyurethane membrane.
  • This deformable pocket 3 has a lateral portion 8 and a receiving portion 9.
  • the lateral portion 8 is in the form of a circular skirt sealingly attached to the rigid base 2 thanks to a groove 10 formed on the periphery of the rigid base 2.
  • the receiving portion 9 is in turn a disc of which the periphery is attached in a sealed manner to the lateral portion 8 and whose center is pierced with an opening adapted to the passage of the rigid finger 4.
  • the receiving portion 9 is also attached sealingly to the rigid finger 4 by means of a groove 11
  • the deformable bag 3 is thus fixed in a sealed manner on the rigid base 2, except the duct 6 of the rigid finger 4 which allows a gas exchange between the inside and the outside. outside of the deformable bag 3.
  • the deformable pouch 3 may also be formed of a single sheet of flexible material attached to both the periphery of the rigid base 2 and the rigid finger 4.
  • the pin 1 comprises an O-ring 12 disposed over the entire periphery of the receiving portion 9.
  • This O-ring 12 forms a circular lip which can be either attached to the receiving portion 9, or be formed directly by an outgrowth of the material forming the deformable bag 3.
  • sealing can be achieved by the direct contact of the deformable bag 3 with an optical element.
  • the deformable bag 3 is also filled with a solid granular material 13.
  • This solid granular material 13 has been schematically represented in the figures by a pattern of circles spaced apart and regularly distributed, it being understood that this is only a schematic representation designating any set of regular grains or not.
  • the solid granular material 13 may also be made of any material sufficiently rigid to block a lens when the vacuum is made in the deformable bag.
  • This granular material 13 is preferably incompressible.
  • the grains are preferably irregular and / or comprise facets and / or have a high coefficient of friction, these characteristics all aim to ensure a strong cohesion of the whole grains when they are compressed against each other by the pocket deformable 3, these same grains being movable relative to each other when the deformable bag 3 does not exert pressure on them.
  • the granular material may be, for example, glass, sand, or a polymer. Wax or molten metals are not suitable for such application.
  • the size of the grains is in a range including in particular the balls, the granules and the powders.
  • the diameter delimited by the O-ring 12 is preferably smaller than the diameter of the optical element 14 at which the pin 1 is intended to be secured. The O-ring 12 can thus ensure a tight contact between the deformable bag 3 and the surface of an optical element 14 as shown in FIG.
  • the pin 1 is represented with an optical element
  • studs 15 arranged on the receiving portion 9 make it possible to maintain a gap between the surface of the lens 14 and the surface of the receiving portion 9.
  • a groove spirally disposed around the rigid finger 4 may for example replace or add to the pins 15, as well as any other means adapted to maintain a gap between the two aforementioned surfaces.
  • Figures 4 and 5 show a locking device comprising a pin 1 such as that of Figures 1 to 3 and for securing the pin to an ophthalmic lens 14.
  • This locking device comprises, in addition to the pin 1, an enclosure 16 provided with a cover 17 adapted to seal the enclosure 16.
  • the enclosure 16 also has an orifice 18 connected to a pump (not shown).
  • the interior of the enclosure 16 when the latter is closed by the cover 17, can be depressed by means of the pump connected to the orifice 18.
  • the cover 17 comprises, on its face turned towards inside the enclosure
  • gripping tabs 24 for maintaining an ophthalmic lens 14 against the cover 17.
  • These gripping tabs 24 are adapted, in this example, to maintain the ophthalmic lens 14 by buttresses. Any other mode of holding the lens 14 against the cover 17 may be provided, for example by gluing or holding flange.
  • a receptacle 19 for the pin 1 is also disposed inside the enclosure 16. This receptacle 19 is adapted to receive and put in position the pin 1 by cooperating with the shoulder 7 of the pin 1.
  • the receptacle 19 is movable in translation along the axis C by means of a slide 20 made in the body of the enclosure 16, and a slide 21 secured to the receptacle 19 and slidably mounted in this slide 20.
  • the receptacle 19 is further biased towards the cover 17 by a spring 22 disposed in the slideway 20 and held against the slide 21 by a plate 23 fixed to the enclosure 16.
  • the blocking device which has just been described operates as indicated below.
  • the ophthalmic lens 14 is first placed against the cover 17 and is thus maintained by the gripping tabs 24. In parallel, the pin 1 is placed in the receptacle 19 (see Figure 4).
  • the cover 17 is then mounted on the enclosure 16 so that, on the one hand, the cover 17 hermetically closes the enclosure 16 and, on the other hand, the ophthalmic lens is placed against the pin 1 so that the receiving portion 9 of the deformable bag 3 conforms to the shape of the lens 14.
  • the lens 14 comes into contact with the bearing surface 5 of the rigid finger 4. that in the present example, the dimensions of the spring 22, the slider 21, the receptacle 19, and the enclosure 16 are such that, when the cover 17 provided with the lens 14 is put in place, the lens 14 comes position against the bearing surface 5 before the cover 17 reaches its closed position.
  • the closing of the enclosure 16 by the cover 17 forces the lens 14 to push back the bearing surface 5 causing the assembly formed by the pin 1, the receptacle 19 and the slider 21, which compresses the spring 22.
  • the spring 22 thus urges the bearing surface 5 of the rigid finger 4 against the ophthalmic lens 14. It will be observed that the biasing of the spring 22 can be, in a variant, adjusted by varying the position of the the plate 23 or with a screw inserted in the plate 23 and forming a stop for the spring 22.
  • the enclosure 16 is then depressurized by means of the pump connected to the orifice 18 (operation shown schematically by the arrow 25).
  • This depression must be large enough so that the air contained in the deformable bag 3 flows along the rigid finger 4 by the duct 6 and then out of the volume defined by the receiving portion 9, the surface of the ophthalmic lens 14 and the O-ring 12 by crossing the barrier formed by the O-ring 12.
  • the seal 12 vibrates or collapses to allow air to pass outside the pin 1 towards the orifice 18.
  • the pumping is stopped and the orifice 18 is plugged.
  • a relative pressure of about -0.8 bar is generally acceptable for such a predetermined vacuum value.
  • This predetermined depression then reigns inside the enclosure 16, but also inside the deformable bag 3 and between the receiving portion 9 of the deformable bag 3 and the surface of the ophthalmic lens 14.
  • the inside of the chamber 16 is then returned to atmospheric pressure by opening the orifice 18.
  • the inside of the chamber 16 actually reaches atmospheric pressure, it is not the case of the inside of the deformable bag 3 and the volume between the receiving portion 9 and the surface of the ophthalmic lens 14, and this thanks to the seal 12 which, in a way, traps the depression between the pin 1 and the ophthalmic lens 14.
  • the depression inside the deformable bag 3 allows the assembly formed by this deformable bag 3 and the granular material 13 to form a rigid assembly matching the shape of the ophthalmic lens 14.
  • the depression prevailing in the volume delimited by the receiving portion 9 the surface of the ophthalmic lens 14 and the O-ring 12, the latter makes it possible to hold the lens 14 and the pin 1 against each other .
  • FIGS. 6 and 7 illustrate embodiments of the rigid finger 4 for certain ophthalmic lenses that would tend to plug the duct 6 when in place against the bearing surface 5.
  • Figure 6 shows a rigid finger 4 'having a duct 6' Y which splits to release the bearing surface 5 opening on either side of this surface.
  • the variant of Figure 7 shows a rigid finger 4 "made of a porous material for performing the vent function of the rigid finger over the entire surface of the rigid finger 4".
  • the variants of the rigid finger 4, 4 ', 4 "of Figures 1, 6 and 7 can of course be combined.
  • the rigid base 2 may have any shape adapted to a particular machining machine.
  • the rigid finger 4 may have a different disposition within the pin 1 and may even be omitted in the event that the vent function is provided directly by the receiving portion 9, for example by a perforation.
EP06847142A 2005-12-27 2006-12-26 Verschlussvorrichtung für ein optisches element Active EP1965942B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0513360A FR2895293B1 (fr) 2005-12-27 2005-12-27 Dispositif de blocage pour element optique.
PCT/FR2006/002876 WO2007074240A2 (fr) 2005-12-27 2006-12-26 Dispositif de blocage pour element optique

Publications (2)

Publication Number Publication Date
EP1965942A2 true EP1965942A2 (de) 2008-09-10
EP1965942B1 EP1965942B1 (de) 2009-04-01

Family

ID=36997793

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06847142A Active EP1965942B1 (de) 2005-12-27 2006-12-26 Verschlussvorrichtung für ein optisches element

Country Status (7)

Country Link
US (1) US8177607B2 (de)
EP (1) EP1965942B1 (de)
AT (1) ATE427176T1 (de)
DE (1) DE602006006095D1 (de)
ES (1) ES2325133T3 (de)
FR (1) FR2895293B1 (de)
WO (1) WO2007074240A2 (de)

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TWI326958B (en) * 2007-01-02 2010-07-01 Delta Electronics Inc Motor
WO2011076904A1 (en) * 2009-12-24 2011-06-30 Essilor International (Compagnie Generale D'optique) A method for mounting an optical lens to be polished
IT1400213B1 (it) * 2010-06-04 2013-05-24 Zoppi Dispositivo di supporto con superficie di contatto conformabile e riconfigurabile
US20130303060A1 (en) * 2010-11-26 2013-11-14 Schneider Gmbh & Co. Kg Block piece
JP5864298B2 (ja) * 2011-02-21 2016-02-17 Hoya株式会社 眼鏡レンズの製造方法
TWI534494B (zh) * 2012-07-12 2016-05-21 鴻海精密工業股份有限公司 鏡頭模組組裝平臺、組裝裝置及組裝方法
ITMI20131758A1 (it) * 2013-10-22 2015-04-23 Mei S R L Processo di lavorazione di una lente
KR101673031B1 (ko) 2015-07-31 2016-11-07 그래핀스퀘어 주식회사 그래핀 필름의 제조 장치 및 방법
PL3415274T3 (pl) * 2017-06-12 2023-04-11 Essilor International Urządzenie blokujące dla półfabrykatu elementu optycznego
US11260542B2 (en) * 2019-10-31 2022-03-01 GM Global Technology Operations LLC Universal vacuum cup and method of lifting an object
EP4029648A1 (de) * 2021-01-14 2022-07-20 MEI S.r.l. Blockfreier linsenträger zur linsenoberflächenbearbeitung
DE102021005202A1 (de) 2021-10-19 2023-04-20 Satisloh Ag Aufnahme für die Bearbeitung von optischen Werkstücken, insbesondere Brillenlinsen

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FR2612823B1 (fr) * 1987-03-27 1994-02-25 Essilor Internal Cie Gle Optique Outil a depression autoconformable a la surface d'une lentille ophtalmique et utilisable notamment comme tampon applicateur ou polissoir
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BR9610536A (pt) * 1995-09-18 1999-07-06 Minnesota Mining & Mfg Bloco de lente oftálmica composição bloco base pré-moldado processo para reter um molde de lente oftálmica fita conformável para unir um bloco de lente com um molde de lente oftálmica e kit de blocagem de lente oftálmica
US6863602B2 (en) * 2002-12-04 2005-03-08 Gerber Coburn Optical, Inc. Method and apparatus for blocking and deblocking a lens
FR2900356B1 (fr) * 2006-04-27 2008-07-18 Essilor Int Outil de surfacage d'une surface optique

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Also Published As

Publication number Publication date
ES2325133T3 (es) 2009-08-26
ATE427176T1 (de) 2009-04-15
FR2895293B1 (fr) 2008-02-01
WO2007074240A3 (fr) 2007-08-16
WO2007074240A2 (fr) 2007-07-05
FR2895293A1 (fr) 2007-06-29
EP1965942B1 (de) 2009-04-01
US8177607B2 (en) 2012-05-15
DE602006006095D1 (de) 2009-05-14
US20080299881A1 (en) 2008-12-04

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