EP0930954A1 - Systeme de fabrication d'un verre optique a partir d'une ebauche - Google Patents
Systeme de fabrication d'un verre optique a partir d'une ebaucheInfo
- Publication number
- EP0930954A1 EP0930954A1 EP98921542A EP98921542A EP0930954A1 EP 0930954 A1 EP0930954 A1 EP 0930954A1 EP 98921542 A EP98921542 A EP 98921542A EP 98921542 A EP98921542 A EP 98921542A EP 0930954 A1 EP0930954 A1 EP 0930954A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blank
- adapter
- glass
- information
- fitting
- 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
Links
- 239000005304 optical glass Substances 0.000 title claims description 12
- 239000011521 glass Substances 0.000 claims abstract description 36
- 230000005855 radiation Effects 0.000 claims abstract description 18
- 238000005520 cutting process Methods 0.000 claims abstract description 15
- 238000012546 transfer Methods 0.000 claims abstract description 6
- 230000010365 information processing Effects 0.000 claims description 27
- 238000004458 analytical method Methods 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 claims description 17
- 230000003287 optical effect Effects 0.000 claims description 14
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 230000004913 activation Effects 0.000 claims description 6
- 238000012512 characterization method Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000003213 activating effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000003100 immobilizing effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 238000013138 pruning Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B51/00—Arrangements for automatic control of a series of individual steps in grinding a workpiece
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
- B24B13/06—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor grinding of lenses, the tool or work being controlled by information-carrying means, e.g. patterns, punched tapes, magnetic tapes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
- B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
- B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
- B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
- B24B9/144—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms the spectacles being used as a template
-
- 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
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
- B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
- B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
- B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
- B24B9/146—Accessories, e.g. lens mounting devices
-
- 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
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
- B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
- B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
- B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
- B24B9/148—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms electrically, e.g. numerically, controlled
Definitions
- the present invention relates to a system for manufacturing an optical glass from a blank.
- Manufacturing systems of this type are already known in the prior art, which include a device for fitting an adapter onto the blank for its transfer and mounting in a device the size of which ci, controlled using size information, to make the optical glass.
- an optical glass blank is held for example between two ends of a divided shaft of a grinding machine, by means of an adapter which is for example in the form of a suction cup or a any adhesive support, applied with precision thereon to define the axis of rotation of this blank in the grinding machine.
- These probing means are then suitable for measuring radii of a mount or of a corresponding gauge, which are then used to generate control signals applied to the grinding machine by through a computer, during the roughing operation to obtain the glass.
- Such a computer is generally associated with a screen making it possible to display the shape of the circles of the frame or that of the template for control for the user of the system.
- EP-A-0 206 860 describes a device for centering and fitting an adapter on a blank of optical glass, precisely.
- This device indeed establishes itself the information necessary for the direct control of the size machine, according to the particular morphological data of the patient having to wear the glasses and of data relating to the chosen frame.
- the device described in this document then includes a frame database or database and a computer associated with a display screen, constituted for example by a flat electronic display.
- this computer includes means for displaying and moving on this screen, an image stored in the database, of a spectacle frame or of a corresponding template, as well as means for controlling and memorizing movements of the image of this mount on the screen, means for calculating the differences in its final coordinates with respect to a reference position and calculate the resulting ordering information for the grinding machine and means for applying corresponding commands directly to the grinding machine in order to allow the size of the blank.
- the device described in this document comprises a pivoting system for fitting the adapter onto the blank, and optical sighting means for positioning the blank under this pivoting system for fitting the adapter.
- the characteristics of the blank that is to say for example its power, and to mark thereon. for example its optical center and in the case of a cylindrical blank, its optical axis or other optical characteristics depending on the type of blank and glass to be manufactured.
- the object of the invention is therefore to solve these problems.
- the subject of the invention is a system for manufacturing an optical glass from a blank, of the type comprising a device for fitting an adapter on the blank for its transfer and mounting. in a size device thereof controlled using size information, for manufacturing the optical glass, characterized in that it comprises:
- means for acquiring the characteristics of the glass to be manufactured means for supporting the blank, in the device for fitting the adapter, associated with means for fitting the adapter to the blank,
- FIG. 1 represents a block diagram illustrating the structure and the operation of a first embodiment of a manufacturing system according to the invention
- Fig.2 shows a block diagram illustrating the structure and operation of a second embodiment of a manufacturing system according to the invention.
- the present invention relates to a system for manufacturing an optical glass from a blank, designated by the general reference 1 in FIG. 1.
- This system includes a device for fitting an adapter to this blank, this device being designated by the general reference 2 in this figure, with a view to its transfer and its mounting in a device of the size thereof, controlled by the using size information to make optical glass.
- the cutting device is designated by the general reference 3.
- such a pruning device comprises for example a grinding machine or a grinder which is adapted to receive the blank by means of its adapter, between two shafts divided therefrom for example.
- the blank and the cutting tool thereof are animated with a relative movement making it possible to obtain the glass to be produced after an adequate size of this blank.
- the cutting tool can then be rotatably mounted around a fixed axis in position and the blank can be mounted movable in rotation and in translation relative to this tool, according to size information, to obtain the glass from this blank.
- an information processing unit designated by the general reference 4 in this figure constituted for example by any suitable computer, this information processing unit 4 being connected to means for acquiring the characteristics of the glass to be manufactured, designated by the general reference 5 in this figure.
- these characteristics of the glass to be manufactured may also include data on its shape and data on its optical characterization, which can be obtained for example from information input means relating to the frame in which the lens is to be placed and the patient for whom the lens is intended.
- the means for entering information relating to the frame in which the lens is to be placed are designated by the general reference 6, while the means for entering information relating to the patient for whom the lens, are designated by the general reference 7.
- these means 6 for inputting information relating to the frame may comprise means for storing a frame database in a conventional manner.
- this database all the information relating to different frames is stored and this information can be accessible to the information processing unit 4, for example under the control of a man-machine interface designated by the general reference 8 in this figure, allowing a user of the system to select the corresponding frame and therefore the information processing unit 4 to acquire the information corresponding to the selected frame.
- the means for entering information relating to the patient for whom the lens is intended may also include means for storing data also in the form of a database, in which the various information relating to one or more are stored. several patients and allowing to take into account the specific characteristics of each of them in order to manufacture a corresponding glass.
- This information is also accessible to the information processing unit 4 under the control for example of the human-machine interface 8 described above, to allow this information processing unit to acquire this corresponding data in the means storage 7.
- this interface 8 can also be used in a conventional manner for entering directly into the information processing unit, the information relating to the patient for whom the glass is intended, as is already known in the state. of the technique, using information display means.
- the blank 1 is placed in the device for fitting the adapter 2 on support means for the latter, designated by the general reference 10 in this figure 1.
- These means of support 10 comprise for example a transparent plate of this device for fitting the adapter, these support means 10 being associated with fitting means 2a of the adapter on the blank 1.
- Means for immobilizing the blank position such as pliers or the like are also provided in these support means, but will not be described in detail below, since they are well known.
- the adapter is designated by the general reference 11 and is arranged for example at the end of a support arm designated by the general reference 12, carried for example by a bracket designated by the general reference 13, this arm and this bracket being movable, as will be described in more detail below, to allow the fitting of the adapter 11 on this blank 1.
- the device 2 for placing the adapter on the blank, means for transmitting / receiving analysis radiation through the blank, arranged on either side of this one.
- these means comprise a portion for emitting radiation designated by the general reference 14 in this FIG. 1, arranged above this blank 1 and a receiving portion designated by the general reference 15, disposed below this blank 1 and then receiving the analysis radiation after it has passed through this blank 1 and the transparent support means 10 thereof.
- These transmission / reception means are connected to means 16 for processing the signals delivered by these means. to allow the information processing unit 4 to acquire the characteristics of the blank 1.
- the means of emission / reception of the analysis radiation described above can for example comprise an automatic focometer, of conventional type well known in the state of the art.
- Such an apparatus then allows the information processing unit 4 to acquire the characteristics of the blank, these characteristics further comprising shape data thereof and optical characterization data thereof, such as this has been described previously.
- this structure allows the information processing unit 4 to acquire the characteristics of the glass to be manufactured, that is to say in particular its shape and its optical characterization data from the input means. described above and the characteristics of the blank, that is to say in particular its shape and its optical characterization data, by analysis of the signals delivered by the analysis transmission / reception means thereof, integrated in the device for fitting the adapter to this blank.
- the analysis of the output signals from the means for transmitting and receiving the analysis radiation allows the information processing unit 4 to very precisely determine the position of the blank in the processing device. Installation of the adapter and possibly its orientation relative to it.
- the information processing unit 4 is adapted to automatically determine the size information of the blank, in a coordinate system centered on the axis of the cutting device, to control the processing device. size in order to make the glass from the blank. This size information is then transmitted for example to designated control interface means. by the general reference 17 in this FIG. 1, making it possible to control the device of size 3.
- the information processing unit 4 can be connected to means for activating the means for fitting the adapter 11 to the blank 1 to trigger the automatic fitting of this adapter thereon, classic way.
- These means then comprise for example an activation member, designated by the general reference 18 in this FIG. 1, controlled by the information processing unit 4 through control interface means 19, to control the automatic laying. 1 adapter on the blank before its transfer to the cutting machine.
- an activation member designated by the general reference 18 in this FIG. 1
- control interface means 19 to control the automatic laying. 1 adapter on the blank before its transfer to the cutting machine.
- the operations of acquiring the characteristics of the blank and depositing the adapter thereon are carried out without the operator having to move it, the information processing unit responsible for determining the size information according to the results of the analysis of the blank, that is to say its optical characteristics and its arrangement in the fitting device of the adapter to control the size of the blank in order to obtain the desired glass.
- a camera for reading information carried by the blank associated with a light source can also be used to acquire the characteristics of the latter.
- the device for fitting the adapter to the blank can also include means for relative displacement of the means for supporting the blank and means for fitting the adapter to the latter, for fitting the adapter at a predetermined location of the blank, as illustrated in FIG. 2.
- FIG. 2 we recognize a manufacturing system largely similar to that shown in FIG. 1.
- means for angular displacement of the adapter 11 can also be provided, if necessary, which can be the case for example for glasses having complex configurations, such as bifocal glasses, etc. ...
- These displacement means are designated by the general reference 25 in this figure 2 and comprise for example an angular orientation member of the adapter 11, also controlled by the information processing unit 4 through means interface designated by the general reference 26.
- Such a structure allows for example to place the adapter on the optical center of the blank in order to simplify the control of the cutting device during the cutting operation.
- control information of these members is then calculated by the information processing unit 4 in a conventional manner from the characteristics of the blank, and of the glass to be produced and of the relative initial position of this blank in the processing device. poses, on its support means.
- the activation and displacement members described above may for example include electric or other motors.
- the information processing unit 4 can also be adapted to set up performs a phase of checking the inscription of the glass to be produced in the blank and that of the adapter in the glass to be produced therein, to allow the detection of a possible problem of size of this blank.
- the information processing unit 4 can include any suitable computer programmed in a conventional manner to fulfill the various acquisition, calculation and control functions described above.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- Eyeglasses (AREA)
- Microscoopes, Condenser (AREA)
- Sampling And Sample Adjustment (AREA)
- Mechanical Coupling Of Light Guides (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9704845A FR2762247B1 (fr) | 1997-04-18 | 1997-04-18 | Systeme de fabrication d'un verre optique a partir d'une ebauche |
| FR9704845 | 1997-04-18 | ||
| PCT/FR1998/000762 WO1998047660A1 (fr) | 1997-04-18 | 1998-04-15 | Systeme de fabrication d'un verre optique a partir d'une ebauche |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0930954A1 true EP0930954A1 (fr) | 1999-07-28 |
| EP0930954B1 EP0930954B1 (fr) | 2002-02-27 |
Family
ID=9506096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98921542A Expired - Lifetime EP0930954B1 (fr) | 1997-04-18 | 1998-04-15 | Systeme de fabrication d'un verre optique a partir d'une ebauche |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6298277B1 (fr) |
| EP (1) | EP0930954B1 (fr) |
| DE (1) | DE69803977T2 (fr) |
| ES (1) | ES2173578T3 (fr) |
| FR (1) | FR2762247B1 (fr) |
| WO (1) | WO1998047660A1 (fr) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2854268B1 (fr) * | 2002-05-02 | 2005-12-02 | Briot Int | Dispositif d'acquisition et d'affichage de donnees associees a un objet ophtalmique et procede d'analyse d'image correspondant |
| US20040230335A1 (en) * | 2003-05-13 | 2004-11-18 | Gerding David W. | System for capturing shape data for eyeglass lenses, and method for determining shape data for eyeglass lenses |
| US7090559B2 (en) * | 2003-11-19 | 2006-08-15 | Ait Industries Co. | Ophthalmic lens manufacturing system |
| US7648237B2 (en) * | 2004-03-31 | 2010-01-19 | Topcon Corporation | Device for installing suction jig for eyeglass lens and method for determining suction jig installation position |
| FR2924290B1 (fr) * | 2007-11-23 | 2009-11-20 | Nanoscale Labs | Signal de conversion d'un signal pour emettre ou recevoir un signal radiofrequence |
| JP5420957B2 (ja) * | 2009-03-31 | 2014-02-19 | 株式会社ニデック | 眼鏡レンズ加工装置 |
| US20250283781A1 (en) * | 2024-03-06 | 2025-09-11 | Benz Research And Development Corp. | Method and system for determining an optic center of a lens blank |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0092364A1 (fr) * | 1982-04-14 | 1983-10-26 | The Hanwell Optical Co. Limited | Méthode et appareil pour façonner un verre de lunettes pour l'emboîter dans une monture |
| FR2547930B1 (fr) * | 1983-05-06 | 1987-12-24 | Helbrecht Otto | Rectifieuse a commande numerique pour les bords de verres de lunettes |
| US4656590A (en) * | 1984-11-07 | 1987-04-07 | Ronald Ace | Method and apparatus for making patterns for eyeglasses |
| FR2582975B1 (fr) * | 1985-06-10 | 1987-08-28 | Briot Int | Appareil pour centrer et poser un adaptateur sur une ebauche de verre optique et pour commander une rectifieuse |
| US4912880A (en) * | 1985-12-06 | 1990-04-03 | Cobain Optical Industries, Inc. | Computerized tracing/edging system |
| DE68928073T2 (de) | 1988-10-05 | 1998-02-05 | Topcon Corp | Linsemesser |
| US5053971A (en) * | 1989-08-30 | 1991-10-01 | Gerber Optical, Inc. | Method and apparatus for edging an optical lens |
| US5425665A (en) * | 1992-12-09 | 1995-06-20 | National Optronics, Inc. | Optical lens blocker and method |
| IL113950A0 (en) * | 1994-06-10 | 1995-08-31 | Johnson & Johnson Vision Prod | A method of positioning ophthalimic lenses |
| US5633504A (en) * | 1995-03-30 | 1997-05-27 | Wesley-Jessen Corporation | Inspection of optical components |
| DE19527222C2 (de) * | 1995-07-26 | 1997-09-04 | Wernicke & Co Gmbh | Anlage zum Schleifen wenigstens des Umfangsrandes von Brillengläsern und Verfahren zum rechnerischen Berücksichtigen der Position eines an einem Haltekopf der Anlage gehaltenen Brillenglasrohlings |
-
1997
- 1997-04-18 FR FR9704845A patent/FR2762247B1/fr not_active Expired - Fee Related
-
1998
- 1998-04-15 EP EP98921542A patent/EP0930954B1/fr not_active Expired - Lifetime
- 1998-04-15 ES ES98921542T patent/ES2173578T3/es not_active Expired - Lifetime
- 1998-04-15 WO PCT/FR1998/000762 patent/WO1998047660A1/fr not_active Ceased
- 1998-04-15 US US09/202,501 patent/US6298277B1/en not_active Expired - Lifetime
- 1998-04-15 DE DE69803977T patent/DE69803977T2/de not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9847660A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US6298277B1 (en) | 2001-10-02 |
| DE69803977D1 (de) | 2002-04-04 |
| ES2173578T3 (es) | 2002-10-16 |
| EP0930954B1 (fr) | 2002-02-27 |
| FR2762247B1 (fr) | 1999-07-09 |
| WO1998047660A1 (fr) | 1998-10-29 |
| DE69803977T2 (de) | 2002-11-21 |
| FR2762247A1 (fr) | 1998-10-23 |
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