EP1894673A1 - Method and device for preparing lenses for glasses with a view to mounting them in the frame chosen by the wearer - Google Patents

Abstract

The method involves acquiring an optical reference frame of a lens (100) by a turntable (2) and fixing a locking accessory (201) in the frame during centering of the lens. The lens is trimmed according to a contour in the frame and mounting parameters. The accessory has a radio frequency identification element (220) carrying an identification code. The code is read according to a reading during the centering of the lens for associating the parameters into a memory. The code is read according to another reading during trimming of the lens for recovering the parameters associated to the code.

Description

TECHNICAL FIELD TO WHICH THE INVENTION REFERS

The present invention relates generally to the mounting of ophthalmic lenses of a pair of corrective glasses on a frame and more particularly to a method and a device for preparing the lenses of a pair of glasses for mounting on the chosen mount. by the wearer.

TECHNOLOGICAL BACKGROUND

The technical part of the optician's profession is to mount a pair of ophthalmic lenses in or on the frame selected by the wearer, so that each lens is properly positioned facing the corresponding eye of the wearer to best exercise the optical function for which it was designed.

To achieve the assembly of this pair of ophthalmic lenses, the optician, or the operator, must in particular, from optical, geometric and morphological control data, proceed to the trimming of each lens. The trimming of a lens consists in modifying the contour of this lens to adapt it to the chosen frame and / or to the desired lens shape.

To carry out this trimming, it is necessary to carry out a certain number of operations by means of a device for preparing lenses. Known lens preparation devices comprise, on the one hand, a computer on which lens control data recording software is installed, and, on the other hand, a chain of processing apparatus comprising, inter alia, a lens control device. centering of lenses and a bending machine.

The geometrical control data includes the desired shape of the lens after trimming. The desired shape is defined numerically by means of a device specially designed to read the inner contour of the "circle" (ie the frame of the lens) of the frame or the outline of a template of lens, or an electronic file pre-recorded or provided by the manufacturer. This form information is recorded in turn with the recording software.

After the choice of the frame, the operator must locate the position of the pupil of each eye in the frame of the frame. The operator places the frame chosen by the wearer on his nose and makes several measurements on it. These measurements provide data relating to the morphology of the wearer. It thus determines, mainly, two so-called centering parameters related to the morphology of the wearer, namely the inter-pupillary distance and the height of the pupil relative to the frame. The operator enters this information Morphological editing with the recording software.

When ordering the pair of lenses (also called "job") associated with the carrier, the operator enters, using the appropriate control data recording software, the optical control data of the two lenses of the pair on hold. These are in particular spherical and cylindrical powers, prismatic axes, and, where appropriate, the addition of power.

When the operator receives one of the pairs of lenses for which he has recorded the control data in the control data recording software, each apparatus of the processing chain must be informed of the received pair of lenses to be processed, so that it can recover the recorded command data of the lens to be processed.

For this purpose, the software for recording the order data makes it possible to print a card summarizing the main elements of the order (customer name, optical prescription characteristics, etc.) and an identification barcode. of the pair of lenses. For each pair of lenses, the operator places, after having made the order, the frame and the plug provided with the identification barcode of the pair of lenses in a tray while waiting for reception of the pair of lenses ordered.

Upon receipt of the pair of lenses to be processed, the operator uses a barcode reader associated with the centering device to read the bar code on the printed form. This operation then allows him to recover control data essential to the centering of the lens, that is to say to the coherence of the geometric reference of the lens with the position of the pupil so that the points and characteristic directions are properly positioned in the mount. It then proceeds to lock the lens by depositing a self-adhesive gripping accessory to physically materialize the centering reference of this lens.

Then, the operator reads the bar code of the printed form with a barcode reader associated with the bending machine so that the computer provides the machine with the geometric data representative of the shape of the contour of each of the right lenses. and left.

Such a device requires the operator a little easy handling since it must, firstly, identify the sheet corresponding to the order of the pair of lenses he has received and, secondly, scan the barcode the printed form to be able to select this pair of lenses (or job) and allow the processing device concerned to receive the control data from the selected lens pair. Such manipulation is time consuming and can cause errors. In particular, when trimming, the operator risks confusing the right and left lenses between them. The operator is also dependent on the tray without which the lens can not be identified, confusion likely to occur between two lenses or two jobs. It also happens that the operator chooses a locking accessory poorly adapted to the lens to be cut.

This solution also requires a barcode reading means which increases the cost of the treatment device of the pair of lenses. On the other hand, the use of printed identification cards, which must be read by the operator, prevents automation of lens processing.

OBJECT OF THE INVENTION

The object of the present invention is to simplify the preparation for mounting the lens in a frame while limiting the possible errors of manipulation of the lenses by the operator.

• une première étape dite de centrage au cours de laquelle on acquiert le référentiel optique de la lentille et on fixe sur celle-ci un accessoire de blocage convenablement positionné dans le référentiel optique de la lentille,
• une seconde étape de détourage de la lentille suivant un contour souhaité dans un référentiel lié à l'accessoire de blocage et donc au référentiel optique de la lentille, compte-tenu des paramètres de montage.

For this purpose, it is proposed according to the invention a method for preparing a spectacle lens for mounting on the frame chosen by the wearer, taking into account stored mounting parameters, related to the morphology of the wearer and to the geometry of the frame, comprising the following steps:

• a first so-called centering step during which the optical reference system of the lens is acquired and there is fixed on it a locking accessory suitably positioned in the optical reference system of the lens,
• a second step of trimming the lens along a desired contour in a reference linked to the locking accessory and therefore to the optical reference system of the lens, taking into account the mounting parameters.

The locking accessory being equipped with an electronic element carrying an identification code, this identification code of the electronic element is read, firstly according to a first reading during the centering step to associate it. in memory to the mounting parameters of the lens receiving the blocking accessory, then according to a second reading during the trimming step to retrieve the mounting parameters associated with the read identification code and therefore to the lens attached to the locking accessory.

The lens to be treated is thus identified by the identification code of the electronic element that equips the locking accessory. Once the locking accessory is attached to the lens, it is possible to identify the lens throughout the preparation for mounting, by passing the lens with its locking accessory in the reading field of the code reader. identification.

The identification of the lens is easy and can be automated since the electronic element having the identification code is attached via the locking accessory to the lens. In addition, the manipulation error on the part of the operator is limited.

Advantageously, said electronic element is a radio frequency identification element.

The use of a radio frequency identification element makes it possible to identify the lens when it is located in the reading field of the identification code reader without worrying about the geometrical configuration of the lens by report to the reader, neither of its cleanliness or optical readability. The identification of the lens is thus simplified.

According to another advantageous characteristic of the invention, said characteristic of the locking accessory comprises a dimension of this locking accessory.

It is thus possible to verify that the selected locking accessory is compatible with the lens to be treated. In particular, it can be verified that the size of the locking accessory makes it possible to apply it to the lens at a sufficient distance from the desired contour of the lens to enable the lens to be properly contoured. It is also verified that the locking accessory is sufficiently large to provide a contact surface sufficient to prevent the lens from slipping when trimming.

DETAILED DESCRIPTION OF AN EXEMPLARY EMBODIMENT

The following description with reference to the accompanying drawings of an embodiment, given by way of non-limiting example, will make it clear what the invention consists of and how it can be achieved.

• la figure 1 est une vue d'ensemble en perspective de l'extérieur d'un dispositif de centrage et de blocage du dispositif de préparation, muni d'un capotage ;
• la figure 2 est une vue similaire à la figure 1, une porte d'accès du capotage ayant été ouverte pour permettre le chargement et le déchargement d'une paire de lentilles et d'accessoires de blocage dans un carrousel ;
• la figure 3 est une vue en perspective de l'intérieur du dispositif de centrage et de blocage dans une configuration du carrousel où l'un des accessoires de blocage peut être saisi par la tête de préhension d'un dispositif de blocage ;
• la figure 4 est une vue en perspective de l'intérieur du dispositif de centrage et de blocage dans une configuration du carrousel selon laquelle l'une des lentilles est prête à être palpée par des moyens de palpage ;
• la figure 5 est une vue en perspective de l'intérieur du dispositif de centrage et de blocage dans une configuration du carrousel selon laquelle l'une des lentilles est positionnée sous le dispositif de blocage pour recevoir l'un des accessoires de blocage ;
• la figure 6 est une vue d'ensemble en perspective d'un dispositif de détourage du dispositif de préparation ;
• la figure 7 est une vue de détail en coupe de l'accessoire de blocage dans lequel est monté un élément d'identification par radio-fréquence ;
• la figure 8 est une vue de détail de dessus de la partie de l'accessoire de blocage représentée à la figure 7 et de l'élément d'identification par radio-fréquence ;
• la figure 9 est une vue en perspective de l'intérieur du dispositif de centrage et de blocage dans une configuration du carrousel où les accessoires de blocage peuvent être identifiés par radio-fréquence.

In the accompanying drawings:

• Figure 1 is an overall perspective view of the outside of a device for centering and blocking the preparation device, provided with a cowling;
• FIG. 2 is a view similar to FIG. 1, an access door of the cowling having been opened to allow the loading and unloading of a pair of lenses and locking accessories in a carousel;
• Figure 3 is a perspective view of the interior of the centering and locking device in a carousel configuration where one of the locking accessories can be grasped by the gripping head of a locking device;
• FIG. 4 is a perspective view of the inside of the device of FIG. centering and locking in a carousel configuration according to which one of the lenses is ready to be probed by probing means;
• Figure 5 is a perspective view of the interior of the centering and locking device in a carousel configuration in which one of the lenses is positioned under the locking device to receive one of the locking accessories;
• Figure 6 is an overall perspective view of a trimming device of the preparation device;
• Figure 7 is a detailed sectional view of the locking accessory in which is mounted a radio frequency identification element;
• Figure 8 is a detail view from above of the portion of the locking accessory shown in Figure 7 and the radio frequency identification element;
• Figure 9 is a perspective view of the interior of the centering and locking device in a carousel configuration where the locking accessories can be identified by radio frequency.

The mounting preparation device according to the present invention mainly comprises two subassemblies mounted on a common frame (not shown): a centering and locking device for lenses 1 (FIGS. 1 to 5), called a center-and-blocker device, and a trimming device 6 (FIG. 6).

• un carrousel 20 conçu et agencé pour réceptionner une paire de lentilles 100, 101, et pour les faire circuler entre plusieurs positions ;
• un dispositif de mesure 5 servant à la mesure automatique de diverses caractéristiques optiques et géométriques des lentilles 100, 101 (qui peuvent être par exemple unifocales, multifocales à pastille(s) de vision de près ou intermédiaire avec discontinuité de puissance, ou encore multifocales à addition progressive de puissance);
• des moyens de palpage 7 conçus et agencés pour palper chaque lentille ophtalmique en préparation ;
• un capotage 500 renfermant l'ensemble pour sa protection et possédant une porte 12 d'accès restreint ;
• un écran d'affichage 300 de type LCD.

The centering-and-blocking device 1 comprises several devices mounted on a common frame 10:

• a carousel 20 designed and arranged to receive a pair of lenses 100, 101, and to circulate between several positions;
• a measuring device 5 for the automatic measurement of various optical and geometrical characteristics of the lenses 100, 101 (which may for example be unifocal, multifocal with pellet (s) near vision or intermediate with power discontinuity, or multifocal to progressive addition of power);
• probing means 7 designed and arranged to palpate each ophthalmic lens in preparation;
• a cowling 500 enclosing the assembly for its protection and having a restricted access door 12;
• a display screen 300 of the LCD type.

It is expected that the preparation device also comprises several locking accessories 200, 201, 203, 204 capable of being applied to a face of the lens, in this case its convex face, to mark and keep its reference system. centering.

Locking accessories

Among the locking accessories 200, 201, 203, 204, there are provided large diameter accessories 200, 201 and smaller diameter accessories 203, 204. These locking accessories are also commonly called tassel or holding block.

In each locking accessory 200, 201, 203, 204 is implanted a radio frequency identification element 220, commonly called RFID element (Radio Frequency Identification).

As a reminder, radio frequency identification is a method for storing and retrieving remote data relating to an object using an RFID element implanted in this object. These RFID elements comprise an antenna associated with an electronic chip, which enable them to be electrically powered by the wave flow and to receive and respond to radio requests transmitted from a radio frequency identification code reader, called a reader. RFID. This RFID reader can also be designed to write data into the RFID element.

The center-and-blocker device thus uses an RFID reader that acquires the identification data of the RFID element when it is placed in a given space around this device.

Here, the RFID elements 220 are in the form of small resin cast capsules of diameter much smaller than that of the corresponding locking accessory. Here, the data, or code, identification of the RFID element is constituted by a unique non-modifiable 64-bit number. Alternatively, the RFID elements may also take the form of a torus.

As shown in FIG. 7, the RFID element 220 is housed in a cylindrical opening 210 made in the corresponding locking accessory 200. This cylindrical opening 210 has a diameter slightly greater than that of the RFID element 220. The holding of the RFID element 220 in the cylindrical opening 210 is provided by three tongues 211, 212, 213 which are attached to the wall of the wall. cylindrical opening 210 and distributed substantially at 120 ° to each other relative to the center of the opening (see Figure 8). In addition these tabs 211, 212, 213 are designed to bear against the side wall of the RFID element by bending all in the same direction.

For cost reasons, the RFID element is removable from the locking accessory. For this purpose, there is provided an extraction hole 214 of reduced diameter which opens on the application surface 215 of the locking accessory and in the bottom of the housing 210 of the RFID element. This extraction hole 214 allows the extraction of the RFID element (see FIG. 7) by driving it with the aid of a rod of the pin-punching type introduced into the extraction hole. The housing 210 of the RFID element is offset relative to the central axis A3 of the locking accessory 200, which allows to provide a central orifice 216 centered on the central axis A3 and passing through from one side to the other. locking device for gripping the accessory and for reading out a possible centering mark formed on the lens through this orifice 216.

Carousel

• un plateau de chargement et déchargement 20 monté sur le châssis 10 commun du dispositif centreur-bloqueur 1 pour tourner autour d'un axe de rotation A2 passant sensiblement par son centre et perpendiculaire au plan de ce plateau ;
• sur le plateau de chargement et déchargement 20, deux logements 27,28 apte à recevoir les deux lentilles 100,101,
• deux sièges 21,26 pour le chargement et de déchargement des lentilles 100 et 101,
• des moyens d'immobilisation 22 à 25 des lentilles 100 et 101 chargées sur le plateau 20.

As shown more particularly in FIG. 2, the carousel 2 comprises:

• a loading and unloading platform 20 mounted on the common frame 10 of the centering-blocking device 1 to rotate about an axis of rotation A2 passing substantially through its center and perpendicular to the plane of this plate;
• on the loading and unloading platform 20, two housings 27, 28 able to receive the two lenses 100, 101,
• two seats 21,26 for loading and unloading lenses 100 and 101,
• immobilizing means 22 to 25 lenses 100 and 101 loaded on the plate 20.

As shown in FIGS. 1 and 2, the access to the loading and unloading platform 20 of the carousel 2 is restricted by an access door 12. This access door 12 consists of two sectors 14, 15 which can pivot in opposite directions to reveal an opening 13 for loading and unloading lenses.

In the illustrated example, the housings 27,28 of the two lenses are constituted by recesses which each have a substantially circular shape of diameter slightly greater than the standard one (about 70 mm) of the lenses 100 and 101 to be cut out.

There are provided in each housing 27,28 circular two clamping collets 22 to 25 diametrically opposed which constitute the immobilization means of the lenses (Figures 1 and 3). These clamps are provided with articulated fingers in the general shape of V which can approach, in the closed position, or move apart, in the open position. Each of the clamps is arranged opposite the center of the corresponding housing. The collets 22 to 25 are mounted in the carousel 2 so that when the platen 20 rotates the collets 22 to 25 also rotate with the platen 20 to remain next to the center of each dwelling.

The collets 22 to 25 are biased in the closed position by an elastic member such as a return spring (not shown). Furthermore, the clamps are driven in the open position by a drive mechanism (not shown) driven by an electric motor 421.

The seats 21,26 are arranged slightly below the plate and each have a substantially circular shape of diameter slightly smaller than that of the housing. The seats are mounted fixed relative to the frame 10 so that when the tray is brought to the loading and unloading position of the lenses, the housing 27, 28 are opposite the seats 21,26. In this configuration of loading and unloading, the lenses are then carried by the seats. In the other configurations of the plate, the lenses are held laterally by the collets 22 to 25.

There is also provided housing 205 locking accessories 200, 201,203,204.

Measuring device

The measuring device 5 has two main functions. The first function is to measure local optical powers of the lens at remarkable points thereof.

The second function consists in detecting and locating centering characteristics or locating the lens in order to establish or correctly position the lens in a known global repository of the device. Indeed, when mounting an ophthalmic lens on a frame, it is important for the visual comfort of the wearer to ensure proper positioning of the lens relative to the eye which it corrects a refractive error or accommodation.

Overall, an ophthalmic lens is centered when, on the one hand, the optical center (for unifocal or multifocal lenses with power discontinuity) or the reference center (for progressive lenses) of the ophthalmic lens provided during the design and on the other hand, the pupillary center of the eye is superimposed or otherwise formulated when the line of sight passes through the optic center or reference center of the ophthalmic lens. Centering therefore results from the approximation of two geometric-optical data: the pupil morphology of the wearer and the position on the lens of the optical center or the reference center. The lens must also, to exercise the desired optical function, be properly oriented around its optical axis.

The measuring device can be of any type according to which the lens is presented between illumination means 51 and analysis means (not shown) to obtain an overall measurement of one or more of its optical characteristics in a plurality of points over most of its extent. The overall optical measurement can be obtained by deflectrometry (Hartmann type, moiré, etc.), interferometry, wave propagation, etc. The user interface can then display not only the optical or reference center, but also power and / or power and / or axis maps at one or more remarkable points of the lens.

An example of a measuring device is detailed in the patent application filed on December 3, 2004 under No. FR0412848 in the name of the plaintiff.

Locking device

It is recalled that the optical center of a lens is the point where there is no prism deforming the image. The optical axis is the axis perpendicular to the plane of the lens passing through the optical center.

Furthermore, a point of gripping and locking of the lens on which the blocking will be made is defined. This point is chosen as being confused with a point called boxing center, well known to those skilled in the art, which is the point of intersection of the diagonals of the rectangle in which is inscribed the shape of the desired contour of the lens after trimming, this rectangle with horizontal and vertical sides in the worn configuration (defining horizontality). This boxing center is determined by the measuring device 5 according to the measured locating characteristics of the lens and the parameters of the wearer's morphology and the geometry of the chosen frame. For one of the two main faces of the lens, in this case the convex front face, defines a docking and locking axis, called boxing axis as the axis substantially normal to the surface of the relevant face of this lens and passing through the boxing center.

The locking device 40 is designed and arranged to achieve the docking of one of the locking accessories against one of the two main faces of said lens (in this case the convex front face) in a relative translational movement of the lens. locking accessory relative to the lens along the boxing axis associated with this face. This locking accessory is applied on the convex front face being brought into translation in the direction of docking, with a rigid retention in this translation.

As shown more particularly in FIGS. 3, 5 and 9, the locking device 40 comprises an upper body 43 of substantially cylindrical shape of axis A4 and a lower body 49. The lower body 49 has a cylindrical portion centered on the axis A4 and an arm 42 attached to the lateral face of the cylindrical portion the lower body 49. This arm 42 is rectilinear and extends transversely to the axis of rotation A4, that is to say in the horizontal plane according to the use configuration of the automatic centering device.

The lower body 49 is rotatably mounted about the axis A4 which allows the arm 42 to pivot about the axis A4. The lower body 49 is rotated by means of a set of gears 48 by an electric motor 47 (FIG. 9).

A cylindrical sleeve 41 is attached to the free end of the arm 42 and extends vertically downwards, that is to say toward the carousel. This cylindrical sleeve 41 has a head 50 which is a means for gripping and placing one of the accessories 200, 201, 203, 204 on the lens. The head 50 has a housing (not shown) for receiving the gripping shank 217 of the locking accessory. To temporarily hold the locking accessory, the housing is provided with a tail clamping spring or, alternatively, with a permanent magnet cooperating with a metal insert (which may be constituted by the RFID element 200) fitted to the tail of the locking accessory.

The locking device also has means for resting the arm 42. These resting means can be of the type used for the resting of a turntable arm, with a seat of restraint. high position of the arm on which the arm comes to bear after pivoting in the high position to an angular position of rest. There is also provided an immobilization flange of the arm in the rest position, resting on the upper stop.

Finally, the blocking device 40 is movable in its entirety in translation along a guide rail 46 which is arranged in a direction parallel to the axis A4. The displacement in translation along the axis A4 is achieved by means of a mechanical system comprising a toothed wheel 44 which meshes with a notched plate 45 on its flange and arranged vertically, that is to say in a parallel direction to the A4 axis.

Means of probing

As shown in FIG. 4, the probing means 7 are arranged to palpate independently or jointly the two main faces (front or convex and rear or concave) of the lenses 100, 101. For this purpose, these probing means 7 comprise two branches. 90 and 91 which are substantially rectilinear and which each end with a free angled end forming a Feet 92, 93. The two fingers 92, 93 of the two branches 90, 91 point towards each other so as to be brought into contact with the front and rear faces respectively. On each of the two fingers 92 and 93 are mounted mechanical feelers known in themselves, operating by simple mechanical contact.

One and / or the other of the two branches 90 and 91, in this case the two branches 90 and 91 are movable in translation. This translation makes it possible to separate or bring closer the two fingers 92, 93. The translations of the branches 90, 91 are respectively controlled independently of one another by electric encoder motors (not shown).

Electronic unit and computer control

The centering-and-blocking device 1 comprises an electronic and computer control unit 600 consisting here of an electronic card designed to co-ordinate control of the various devices of the center-and-blocker device 1 to the assembly, such as the carousel, the measuring device, the means probing device and the locking device, in accordance with the automated processing method to be discussed later.

The electronic and computer unit 600 comprises for example in a conventional way a motherboard, a microprocessor, a random access memory and a permanent mass memory. The mass memory contains a program for executing the automated assembly preparation method according to the invention which will be described later. This mass memory is preferably rewritable and is advantageously removable to allow its rapid replacement or programming on a remote computer via a standard standard interface.

There is also provided means of communication with a microcomputer (not shown) which executes software for recording the control data of each pair of lenses. The control data includes, inter alia, the morphological data of the wearer, the desired shape data of the contour of each lens, and prescription data such as the optical characteristics of the lenses to be processed.

The mass memory of the electronic and computer unit 600 houses a computerized lens register, each record of which is associated with a lens or the pair to which this lens belongs and which includes a field to enable, during the described treatment method after that, the memorization of the individual identification code of the electronic element equipping one of the locking accessory. Each lens record is also associated with lens-related editing parameters of that lens. the electronic and computer processing unit 600 is designed to repatriate, during the preparation process, in this register the control data of each pair of lenses via the software of recording of the order data. A method of repatriation of data is precisely described in the patent application filed March 6, 2006, under number FR06 / 01953 in the name of the plaintiff. The electronic and computer processing unit 600 can thus work freely on its own data without the risk of altering the original data stored in the microcomputer hosting the recording software.

It is also planned that the electronic and computer processing unit 600 of the center-and-clamp device 1 comprises a computer register, each record of which is associated with a locking accessory and contains identification data of the RFID element associated with this accessory. and geometric and / or mechanical data relating to the locking accessory such as the diameter of the accessory. Each record of the accessory register also includes a field in which the number of uses of the accessory already made is updated.

The center-and-clamp device 1 comprises a plurality of computer outlets 400, 401, 402, 403, 404, 405 to enable the electronic and computer processing unit 600 to send and receive data. In particular, there is provided a network jack 402 and 400, 401, 403, 404, 405 serial jacks, including one or more USB jacks for receiving one or more USB memory sticks incorporating the mass memory of the electronic processing unit. and computer 600 of the centering and locking device 1. All or part of the mass memory is then easily removable for its security or replaceable for updates of the internal program.

Finally, the preparation device comprises a power supply unit 11 which supplies electricity to the various members of the centering and blocking device 1 such as the electric motors and the electronic and computer processing unit 600.

Clipping device 6

In Figure 6 there is shown a digital trimming device 6 adapted to change the contour of the ophthalmic lens to fit that of the frame or "circle" of a selected frame.

This device comprises a flip-flop 611, which is freely pivotally mounted about a first axis A1, in practice a horizontal axis, on a frame. For immobilization and rotation of a lens Ophthalmic to be machined, the flip-flop 611 is equipped with support means capable of tightening and rotating the ophthalmic lens 100, 101. These support means, or holding means, comprise two shafts and rotating drive 612, 613 These two shafts 612, 613 are aligned with each other along a second axis A2, called the locking pin, parallel to the first axis A1. The two shafts 612, 613 are rotated synchronously by a motor (not shown), via a common drive mechanism (not shown) embedded on the flip-flop 611.

In the following description, we are interested in a lens, here the lens 100 and a locking accessory, here the locking accessory 200, which is bonded to the convex face of the lens 100 to maintain its reference. Of course, the description below also applies to the lens 101.

Each of the shafts 612, 613 has a free end facing each other and which is designed to receive a nose 701, 702 for blocking the lens on the shaft 612, 613. The two noses 701, 702 are generally revolution about the axis A2 and each have a generally transverse application face, arranged to bear against the corresponding face of the lens. In this case, one of the noses 701 is applied to the convex front face of the lens 100 and the other nose 702 is applied to the rear face of the lens 100 to hold the lens tight between the two noses. and allow its rotation training. The application faces of the nose have an ability to cooperate by friction with the lens for its immobilization.

The nose 701 which is applied on the convex front face of the lens 100 is designed to accommodate the locking accessory 200 stuck on the lens 100. For this purpose, a housing 703 is formed in the nose 701. This housing 703 opens on the application side of nose 701.

For the rotational indexing of the nose 701 on the locking accessory 200, the housing has a shape that is not revolution, for example oval. The locking accessory 200 has an outer shape complementary to the housing of the nose 701 to be received in this housing without play, with a slight tightening. The housing 703 is further adapted to receive the locking accessory 200 so that the application surface of the locking accessory 200 is flush with the nose application surface 701.

The shaft 613 is movable in translation along the blocking axis A2, facing the other shaft 612, to effect the compression in axial compression of the lens between the two locking noses. The shaft 613 is controlled for this axial translation by a drive motor via an actuating mechanism (not shown) The other shaft 612 is fixed in translation along the blocking axis A2.

The trimming device 6 comprises a grinder 610 which comprises a train of several grinding wheels 614 mounted coaxially on the third axis A3, for roughing and finish of the edging of the ophthalmic lens 100 to be machined.

As shown diagrammatically in FIG. 6, the wheel set 614 comprises, in particular, roughing and finish grinding wheels 55 centered on the axis A3. The finishing wheel 55 has a beveling groove 57 for producing, if necessary, a bevel on the edge of the lens during the finishing step.

The grinding wheel is attached to a common shaft of axis A3 ensuring their rotational drive during the edging operation. This common shaft, which is not visible in the figures shown, is rotated by an electric motor 620.

The wheel train 614 is also movable in translation along the axis A3 and is controlled in this translation by a drive motor. Concretely, the entire wheel train 614, its shaft and its motor is carried by a carriage 621 which is itself mounted on slides 622 secured to the frame for sliding along the third axis A3. The translational movement of the wheel trolley 621 is called "transfer" and is denoted TRA in FIG. 6. This transfer is controlled by a motorized drive mechanism (not shown), such as a screw and nut system or rack.

To allow a dynamic adjustment of the distance between the axis A3 of the grinding wheels 614 and the axis A2 of the lens during the edging, the pivoting capacity of the lever 611 about the axis A1 is used. This pivoting causes indeed a displacement, here substantially vertical, of the lens 100 sandwiched between the shafts 612, 613 which brings the lens closer or away from the wheels 614. This mobility, which makes it possible to restore the desired shape of trimming (or trimming) is called restitution and is noted RES.

Finally, the grinder 610 is protected by a cover 699. An RFID reader 198 is disposed outside the grinder 610 on the cover 699.

The trimming device 6 comprises an electronic and computer processing unit 199, for controlling the various members, here consisting of an electronic card designed to control in coordination the different mobilities of the working tools and the clamping and rotating drive means. of the lens so that all the points of the contour of the lens 100 are successively reduced to the desired radius.

The electronic and computer system 199 comprises for example conventionally a motherboard, a microprocessor, a random access memory and a permanent mass memory. The mass memory contains a program for executing the machining cycle of each lens according to a desired final contour. This mass memory is preferably rewritable and is advantageously removable to allow its rapid replacement or programming on a remote computer via a standard standard interface.

Computer network

• entre l'unité de traitement électronique et informatique 600 du dispositif centreur-bloqueur 1 et une ou plusieurs unités de traitement électronique et informatique 199 d'un ou plusieurs dispositifs de détourage,
• entre l'unité de traitement électronique et informatique 600 du dispositif centreur-bloqueur 1 et le micro-ordinateur qui héberge le logiciel d'enregistrement des données de commande,
• entre l'unité de traitement électronique et informatique 199 du dispositif de détourage et une ou plusieurs unités de traitement électronique et informatique 600 d'un ou plusieurs dispositifs centreur-bloqueur 1.

The electronic and computer processing unit 600 of the central locking device and the electronic and computer processing unit 199 of the trimming device are provided with communication means by a network architecture. These units are for example provided with electronic cards and wired or wireless network communication software of the Ethernet and or Wifi type. Computer communications can be established for the upstream and downstream transmission of data, including:

• between the electronic and computer processing unit 600 of the center-and-center device 1 and one or more electronic and computer processing units 199 of one or more clipping devices,
• between the electronic and computer processing unit 600 of the center-and-center device 1 and the microcomputer which houses the software for recording the control data,
• between the electronic and computer processing unit 199 of the trimming device and one or more electronic and computer processing units 600 of one or more centric-and-blocking devices 1.

The electronic and computer processing unit 600 of the center-and-blocker device 1 is also programmed to form a data server making available to the other devices present on the network the geometry, morphology and prescription data contained in its lens register.

Preparation process for mounting the lens

Lens processing is done by job. The term "job", commonly used in the ophthalmic optics industry, covers a pair of associated lenses 100 and 101 belonging to the same pair of spectacles and therefore mounted on the same frame to equip a wearer. The processing of a job breaks down according to the following steps.

Preliminary step: Entering or transmitting job order data

In order to perform a correct optical assembly, in a preliminary step, the optician places the frame chosen by the wearer on his nose and performs several morphological measurements on it using a device called "pupillometer" or any other measuring or imaging device. The optician thus notes in particular the interpupillary distance which represents the distance separating the two pupils or the interpupillary half-distances which represent the distances separating each pupil from the center of the nose of the frame carried by the wearer. The optician also notes the height which represents the distance, taken vertically from each pupil, separating the pupil and the lower edge from the circles of the frame carried by the wearer. This height can be measured either by means of presentation glasses having the frame chosen by the wearer and on the lenses of which the location of the wearer's pupils are marked with felt and then measured at the ruler, or by means of a system Digital image capture and processing of this image. This measurement therefore integrates information relating to the geometry of the chosen frame. It is also possible to note the pantoscopic angle which corresponds generally to the inclination of the general plane of each lens with respect to the vertical.

On the other hand, the optician or operator enters, into the control data recording software, the optical control data constituted by the prescription parameters relating to the wearer for whom the job in preparation is intended. These are in particular cylindrical power axes and prismatic powers and axes, and possibly cylindrical power, spherical and possibly the addition of power.

Finally, the geometrical command data constituted by the information representative of the geometry of the desired lens contour (corresponding to the shape of the chosen frame or to a predefined lens shape) are also recorded in the control data recording software. . Here the pair of lenses 100, 101 is intended to be mounted in a rimmed mount. The desired shape of the contour of each lens is obtained using a contour reading apparatus (not shown) specially designed to read the inner contour of the "circle" (i.e., the lens frame ) of the frame or contour of a lens template. This reading device has means of communication with the microcomputer hosting the control data recording software in order to transmit to the recording software the geometric data of the desired contour of each lens. Alternatively, it can be provided that the contour reading apparatus communicates directly with the electronic and computer system 600 for write in the lens register of this system the desired shape data of the contour of each lens.

It is also possible alternatively or in the case of a pair of lenses whose frame is not circled (a pierced mounting for example) that the desired shape is obtained by a pre-recorded electronic file or provided by the manufacturer.

The electronic and computer processing unit 600 then repatriates in the lens register associated with it the control data of each pair of lenses previously recorded via the control data recording software, as explained above.

Step 1: Presentation of the loading and unloading platform 20 in the loading position

If necessary, the electronic and computer unit 600 controls the rotation of the loading and unloading platform 20 to present the two housings 27,28 in the loading position in front of the door 12. As recalled above, in this loading configuration, 27.28 load housing are located vertically next to the seats 21,26.

Step 2: Opening the access door 12

Initially, the access door 12 is closed. The rule is indeed that the access door is generally closed to protect the internal organs of the machine and in particular the loading and unloading tray 20. At the request of the operator, the opening of the door 12 is authorized by the electronic and computer system 600.

Step 3: Loading the lenses and locking accessories

The collets 22 to 25 associated with the housing 27,28 loading are open. In practice, the two lenses 100 and 101 of the job are manually deposited by the operator on the two seats 21, 26 accessible through the access door 12. Of course, an automated loading of the lenses can be envisaged.

Locking accessories 200, 201, 203, 204 are also placed by the operator in the loading locations 205 (FIG. 2).

When the operator has positioned the two lenses and accessories in the carousel, the operator controls the closing of the door 12. The clamps are then controlled in the closed position so that the fingers of the clamps enclose the lenses 100 and 101.

Step 4: Reading the accessories by the RFID reader

As shown in FIG. 3, the plate 20 is rotated to place the accessories 200, 201 in the reading position in the edge of the reading device RFID 197, one after the other.

First, it is verified that at least two locking accessories 200, 201, 203, 204 of the same diameter are present. For this, it is considered that for a given period of time of the plate 20 in the reading position of the locking accessories 200, 201, 203, 204, the absence of acquired identification data corresponds to an absence of the accessories on the carousel . After this verification, the identification data of each RFID element, implanted in one of the locking accessories, is stored. If the verification fails, the electronic processing unit sends a signal to warn the operator.

Hypothetical step 5: Measurement of locking accessories by the measuring device

When the identifier of the RFID element is unknown or when the operator indicates to the electronic and computer processing unit 600 that the RFID element has been assigned to a new accessory, the centering and locking device 1 proceeds to an update of the lock accessories register. The electronic processing unit rotates the plate to place the blocking accessories in measurement position in turn by the measuring device 5. The latter performs a reading followed by an image processing to acquire the diameter of each accessory. blocking. This diameter is recorded in the field provided for this purpose in the locking accessories register.

Step 6: Reading the two lenses 100, 101 of the job successively by the measuring device 5

The loading and unloading tray 20 is rotated to place the first lens 100 under the measuring device 5. The geometric and optical analysis of the lens 100 by the measuring device 5 is performed automatically to provide the unit with The optical power data and the data relating to the reference register for the lens (centering point and orientation), as explained above, are used. These characteristics of optical powers and of identification are stored by the electronic and computer system 600.

In particular, the acquisition of the locating characteristics indicated above will make it possible, in connection with the geometric-morphological data acquired during the preliminary step described above, to determine the exact point of gripping and locking of the lens 100 brought by the tray in the locked position (as explained below).

Step 7: Reconciling the characteristics of the lenses with the data order of the job.

This step makes it possible to identify the pair of lenses in treatment among the pairs of lenses whose characteristics have been repatriated in the lens register of the electronic and computer processing unit 600. This identification of the pair of lenses in process thus allows to load into memory all the information concerning the pair of lenses in process such as information of desired shape, mounting information, and prescription information.

For this purpose, the electronic and computer processing unit 600 compares the values of the characteristics measured for each lens with the values of these characteristics recorded in the lens register and deduces from this comparison the pair of corresponding lenses.

A method of conciliation (that is to say automatic identification) is more precisely detailed in the patent application filed November 9, 2005 under the No. FR0511381 in the name of the plaintiff.

The electronic and computer processing unit 600 then numerically associates in the lens register the identification data of each RFID element 220 with the control data of the corresponding lens. As a result, the locking accessory 200 gripped by the locking device to be applied to the lens 100 is numerically associated with the corresponding lens. It then suffices, as explained below, to identify the lenses 100, 101 and thus exploit its control data, to acquire the identification data of the corresponding RFID element 220.

Step 8: Probing of the contours of the two lenses 100, 101 of the job successively

The loading and unloading tray 20 is rotated to place the first lens next to the probing device 7. The probing fingers 92, 93 then probe the predicted contour of the lens after trimming to check whether this lens is surface and thickness sufficient to obtain the desired lens after trimming by the trimming device 6.

This probing is achieved by combining the horizontal and vertical translation mobilities of the probing tips with the rotational mobility of the plate 20 about the vertical axis A2.

Step 9: Probing of several points near the boxing center of the two lenses 100, 101 of the job for the determination of the normal to the boxing axis and the height position of the boxing center.

The boxing axis, previously defined for the implementation of the invention, is then determined by probing several points (at least three points) located near the boxing center.

Step 10: Confrontation of the characteristics of the job with respect to the order data.

• d'une part une vérification individuelle de la conformité des caractéristiques de chaque lentille du job par rapport aux données de commande saisies par l'opérateur, et
• d'autre part, un contrôle de la cohérence d'ensemble des caractéristiques des deux lentilles considérées en tant que job, c'est-à-dire en fonction de leur appartenance à une même paire de lunettes, avec en particulier la simulation du montage des deux lentilles sur la monture choisie et la vérification que ce montage est possible.

The internal program of the electronic and computer processing unit 600 performs the validation examination, automatic or assisted, of the characteristics of the two lenses 100 and 101 of the job. This validation test consists of a double verification, with:

• on the one hand, an individual verification of the conformity of the characteristics of each lens of the job with respect to the control data entered by the operator, and
• on the other hand, a control of the overall coherence of the characteristics of the two lenses considered as a job, that is to say according to their belonging to the same pair of glasses, with in particular the simulation of the assembly two lenses on the chosen frame and verification that this mounting is possible.

The characteristics for which each lens is individually validated are in particular: type of lens (unifocal, progressive, double or triple focus, etc.); spherical, prismatic, cylindrical powers; addition of power (s) for progressive lenses; cylinder and prism axes; hue; index ; material.

• le centrage de chaque lentille sur la monture en fonction du référentiel de repérage défini au moyen du dispositif de mesure 5 pour chaque lentille et des demi écarts pupillaires et hauteurs propres au porteur, ce centrage permettant de réaliser une simulation du montage des lentilles sur la monture à laquelle elles sont destinées, comme expliqué plus en détail ci-dessous,
• la position axiale prévue du biseau ou de la rainure sur la tranche de chaque lentille par rapport à la face avant de la lentille, afin d'assurer l'esthétisme du montage (positionnement axial équilibré des deux lentilles, l'une par rapport à l'autre, sur la monture) ;
• la cohérence des teintes, indices, dégradés des deux lentilles du job,
• la complémentarité des deux lentilles ou appartenance des deux lentilles au même job : On vérifie que le job se compose bien d'une lentille droite et d'une lentille gauche et que ces deux lentille correspondent bien au même job.

The characteristics for which the two lenses of the pair are considered jointly, in their belonging to the same job, are in particular:

• the centering of each lens on the frame according to the reference frame defined by means of the measuring device 5 for each lens and pupillary half-distances and heights specific to the wearer, this centering making it possible to simulate the mounting of the lenses on the frame for which they are intended, as explained in more detail below,
• the intended axial position of the bevel or the groove on the edge of each lens relative to the front face of the lens, in order to ensure the aesthetics of the mounting (balanced axial positioning of the two lenses, one with respect to the other, on the mount);
• the coherence of the hues, indices, gradients of the two lenses of the job,
• the complementarity of the two lenses or membership of the two lenses to the same job: It is verified that the job is well composed of a right lens and a left lens and that these two lens correspond to the same job.

In particular, the global reconciliation of the job marking characteristics is carried out as follows. On the basis of the information representative of the parameters specific to the wearer's morphology, in particular the pupillary half-distance and the height of the pupil relative to the axis of the horizontal, and information representative of the contour of the chosen frame, acquired during of the preliminary step previously described, the electronic and computer system 600 develops a video image which is displayed on the LCD display screen 300. Therefore, on this screen, we will see in particular, on the same scale the outline of the frame and that of the uncut lens, with its particular characteristics, including the tracking points that are worn or those that have been determined by the implementation of the measuring device. Taking all these elements into account, measured, calculated or read, makes it possible to determine the position of the perimeter of the cut-away lens in relation to the initial ophthalmic lens and, as a result, the position of the point of gripping of the lens, with a view to trimming, which is usually the center of the rectangle in which fits the outline of a frame or "circle" of the mount.

The electronic and computer processing unit 600 performs a computer processing of these geometrical-morphological data approximated with the data relating to the locating characteristics of the ophthalmic lenses 100, 101 of the job, taken together, to simulate their mounting in the corresponding circles of the frame chosen and possibly change their centering.

For each lens 100, 101, which is present on the plate 20, a locking accessory 200, 201 whose diameter is compatible with the desired final contour, the desired finish and the coating of the lens 100, 101 is also verified. electronic processing and computer 600 ensures in particular that the installation of the accessory boxing center is such that a minimum distance is respected between the desired final contour and the outer wall of the locking accessory.

In the event of incompatibility, the electronic and computer processing unit 600 requests the loading of another accessory or selects, after validation by the operator, the accessory whose diameter is best adapted to perform the final trimming according to the desired shape and size of the lens after trimming.

Then the electronic and computer processing unit 600 numerically associates the identification code of the RFID element implanted in the accessory with the lens in the lens register to be processed.

Here, are selected the locking accessory 200 for the lens 100 and the locking accessory 201 for the lens 101.

Step 11: Accept or reject the job

The job is accepted or rejected depending on whether the individual and global characteristics mentioned above are validated and / or modified.

Alternative 1: If the job has been refused, perform the following four steps. Otherwise, they are ignored.

Step 12: Rotation of the loading and unloading platform 20 for presentation of the job opposite the access door 12.

Step 13: Opening the clamps on the loading and unloading tray 20

Step 14: Opening the access door 12 on the operator's command

Step 15: Taking the job by the operator and resetting the process with another job

Alternative 2: If the job is accepted (alternative 2 most likely), we ignore the four previous steps and perform the following steps.

Step 16: Entering and setting up the locking accessory on the lenses

To block each lens 100, 101, the loading and unloading tray 20 is rotated to place the selected locking accessory 200,201 under the blocking device 40 in the so-called gripping position. The gripping position is obtained by combining the rotation mobility of the plate around the axis A2 with the rotational mobility of the arm 42 about the axis A4 so that the head 50 of the arm 42 can be arranged vertically. opposite the locking accessory 200, 201.

Then the blocking device 40 is controlled by the electronic and computer processing unit 600 so that the gripping head 50 grasps the locking accessory 200, 201.

The carousel 20 is rotated to bring the lens 100 into the position of application of the locking accessory on the lens, under the locking device 40. In order to obtain this application position, the rotational mobility of the carousel 2 is combined with the rotational mobility of the arm 42 so that the gripping head provided with the locking accessory is vertical boxing center.

The locking device 40 is then controlled to apply the accessory 200 to the lens 100 with which it is associated, in the boxing center and correctly focused.

Step 17: Rotation of the loading and unloading platform 20 to present the job next to the access door 12

Step 18: Opening the grippers of the loading and unloading tray 20.

Step 19: Opening the access door 12 on the operator's command

Step 20: Taking the job by the operator

The following steps are described for the lens 100 and are also implemented with the other lens 101. The operator moves the lens 100 equipped with its locking accessory 200 in the reading field of the reader RFID 198 disposed on the hood 699 of the clipping device 6. Alternatively, the capture and movement of each lens can be achieved by an automated arm.

The identification data of the lens via the RFID element associated with the locking accessory 200, 201 is acquired and transmitted to the electronic processing and computer processing unit 199 of the clipping device 6. This electronic and computer processing unit 199 of the trimming device 6 then sends a request to the electronic and computer processing unit 600 of the central locking device 1 with this identification data of the lens to repatriate the control data of this lens 100. Electronic and Computer Processing 600 acts as a server.

Step 21: Positioning the lens in the clipping device

The lens 100 equipped with its locking accessory 200 is positioned by the operator in the grinder between the two noses 701, 702. In particular, the locking accessory 200 is inserted into the housing 703 of the nose 701 which is applied on the front face of the lens. Then, as explained above, the two shafts 612, 613 are brought together to tighten the lens and allow it to rotate.

Alternatively, the placement of the lens between the shafts 612, 613 can be performed by an automated arm.

Step 22: Machining (trimming) of the first lens 100 of the job by the trimming device 6.

The electronic and computer system 199 controls the trimming device 6 to perform machining of the periphery of the lens so as to cut the latter along the desired contour, taking into account the locating characteristics of the lens provided by the device. measurement 5 and carrier morphology data and mount geometry data entered into memory.

Depending on the type of editing to which the job being processed is intended (frame with circles, frame without circle with pierced lenses, frame with strapping Nylon wire), the lens is beveled, drilled or grooved. Here, the frame being circled, the lens is beveled.

During machining, the end of each machining step is recorded in a field indicating the processing status of the lens of the job concerned.

Step 23: Update the job status

When the trimming of the lens is completed, the electronic processing unit 199 of the trimming machine communicates with the server center-and-hold device so that it updates, in the lens register, an indicator field of the processing status of the job or both lenses of the job. This field is then modified to contain an indicator according to which the job or one and / or the other of the two lenses of the job has or have been cut off.

Hypothetical step 24: Resumption of the lens

It may happen that a cut-off lens is slightly too large and can not fit correctly in the environment of the frame for which it is intended. In this case, it is necessary to carry out a subsequent recovery of the lens of retouching its periphery to allow mounting. In this case, the RFID element of the locking accessory of the lens, which has remained attached to the lens, is read by the RFID reader of the clipping machine and the electronic processing unit 199 of the clipping machine. communicates with the electronic processing unit 600 of the server center-and-hold device to retrieve the data relating to the lens associated with this RFID identifier. These data include those necessary for the recovery operation itself, as well as the status information of the lens or the job.

Thus, if a lens to be treated has already been cut off, the electronic processing unit 199 of the clipping machine automatically invokes a method of resuming the clipping.

This automation of the call of the mode of recovery of the clipping makes it possible to avoid an error of manipulation of the operator.

Indeed, in case of manual entry of the desired clipping mode, the operator may want to perform a recovery while the lens presented in the grinder is another lens not cut-off. The lens thus cut according to the recovery mode then only has to be discarded.

Thus, a subsequent recovery is automatically identified as such, which makes it possible to call the recovery mode automatically.

The invention is not limited to the particular embodiment which has just been described, but on the contrary covers any variant by reproducing the essential characteristics. For example, the conciliation stage, during which the lens and the job to which it belongs are identified from their optical characteristics, can be deleted. In this case, an initial step is planned during which the optician or operator identifies, for example by choosing from the list of jobs present in the lens register of the center-blocker device or the server apparatus, the job to which belong the lenses installed in the centering-blocking device. The left and right lenses must then be installed in the load slots assigned to them.

In addition, the trimming device and the centering-blocking device may not be mounted on the same frame, but be physically separated from each other.

The RFID reader present on the centering and locking device 1 and / or on the trimming device can be used to identify the operator or the technician in charge of the after-sales service by means of a badge incorporating an RFID element with a device. identification code specific to the operator or technician. The actions performed can then be plotted electronically on a local or remote database server.

Claims (6)

A method for preparing a spectacle lens (100, 101) for mounting on the frame chosen by the wearer, taking into account stored mounting parameters, related to the wearer's morphology and to the frame's geometry, comprising the following steps: a first so-called centering step in the course of which the optical reference of the lens (100, 101) is acquired and a locking accessory (200, 201, 203, 204) appropriately positioned in the optical reference system is fixed on it; of the lens, a second step of trimming the lens (100, 101) according to a desired contour in a frame linked to the blocking accessory (200, 201, 203, 204) and therefore to the optical reference frame of the lens (100, 101) , taking into account the mounting parameters, characterized in that the locking accessory (200, 201, 203, 204) being equipped with an electronic identification element (220) carrying an identification code, this electronic element identification code is read. (220), first according to a first reading during the centering step to associate it in memory with the mounting parameters of the lens (100, 101) receiving the locking accessory (200, 201, 203, 204 ), then according to a second reading during the trimming step to retrieve the mounting parameters associated with the read identification code and therefore the lens (100, 101) attached to the locking accessory (200, 201, 203). , 204). Method according to the preceding claim, characterized in that , after the first reading, is associated in memory, the identification code of the electronic element (220) equipping the locking accessory (200, 201, 203, 204) associated with the lens (100, 101), the indication that the lens (100, 101) concerned corresponds to the right eye or to the left eye of the wearer. Method according to one of the preceding claims, characterized in that , after the step of trimming the lens (100, 101), is associated in memory, the identification code of the electronic element (220) equipping the locking accessory (200, 201, 203, 204) attached to the lens (100, 101), the indication that the lens (100, 101) concerned has been cut off. Method according to one of the preceding claims, characterized in that , from the identification code read according to the first reading, it is sought, in a blocking accessory register (200, 201, 203, 204), at least a geometric or mechanical characteristic of the locking accessory (200, 201, 203, 204) equipped with the electronic element (220) carrying this identification code read and the compatibility of this geometric or mechanical characteristic of the locking accessory (200, 201, 203, 204) with the parameters is verified mounting. Method according to the preceding claim, characterized in that said characteristic of the locking accessory (200, 201, 203, 204) comprises a dimension of this locking accessory (200, 201, 203, 204). Method according to one of the preceding claims, characterized in that said electronic element (220) is a radio frequency identification element.

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