EP3938142B1 - Method for assisting a user in the application of an adhesive label to a surface of an ophthalmic lens with an initial contour before an edging operation and device for implementing the method - Google Patents

Description

TECHNICAL AREA

The present invention relates to a method for assisting a user in the application of an adhesive label on one face of an ophthalmic lens with an initial outline before an edging operation and a device for implementing the method.

STATE OF THE ART

The present invention relates to the field of edging glasses or lenses, particularly ophthalmic glasses or lenses.

An ophthalmic lens results from a succession of molding and/or surfacing/polishing operations which determine the geometry of the two convex and concave optical surfaces of said lens, then appropriate surface treatments.

The last finishing step of an ophthalmic lens is an edging operation which consists in machining the edge or periphery of the lens so as to conform to the dimensions required to adapt the lens to a spectacle frame in which it is intended to take square.

Edging, also called trimming, is generally carried out on a grinder comprising diamond wheels which carry out the machining as defined above.

For this purpose, the lens is held, during this operation, by locking members acting axially, with respect to the optical axis of the lens.

The relative movement of the lens to the grinding wheel is controlled, usually digitally, to achieve the desired shape very precisely.

It is therefore understood that it is absolutely imperative that the lens be firmly held during this movement. Indeed, any blocking defect can result in a defect in machining and in the final contour, which can have the consequence that the machined lens cannot be mounted in the spectacle frame to which it is dedicated.

To do this, before the edging operation, an operation is carried out for glazing the lens, that is to say that a holding means also called an acorn is positioned on the convex surface of the lens. This glans is glued to the lens via a double-sided adhesive called a pad placed on the surface of the glans. A positioning of a tassel on a surface of a lens by a double-sided adhesive is known eg from the document WO2016 012721 A1 , in such a way that after having extracted a reference lens from its frame, the optician fixes the locking tassel on the reference lens by means of a double-sided sticker, taking care that the axis of a pion passes through the center of the reference lens. Markings provided on the lens and on the blocking glans to identify the center and axis of the pin facilitate this operation.

The lens thus equipped is positioned on one of the aforementioned axial blocking members, the second axial blocking member then clamping the lens on its concave face by means of an abutment, generally made of elastomer.

During machining, a tangential torque force is generated on the lens, which can cause the lens to rotate relative to the glans if the lens holding device is not efficient enough. This phenomenon should be avoided because the correct axial arrangement of the lens (good axing) in the frame is essential for lenses treating astigmatism and/or presbyopia.

To avoid this phenomenon of misalignment on slippery lenses, and in particular on lenses comprising a surface treatment (topcoat in English for those skilled in the art) anti-fouling, generally hydrophobic or oleophobic, an adhesive sticker also called sticker or holding pad, for example a simple adhesive, is arranged between the assembly formed by the glans and the pad on the one hand and the convex surface of the lens on the other hand. This adhesive sticker is therefore different and not to be confused with the pad forming an adhesive surface of the glans itself. Generally the holding tassels are pre-equipped with such pads.

However, this adhesive sticker is generally affixed to the convex surface of the lens by hand and its optimal position must depend on the shape and position of the center of the finished ophthalmic lens, i.e. having the final contour to be mounted in a suitable frame, chosen by a final wearer.

• Le collage de la vignette adhésive au mauvais endroit peut faire que la vignette adhésive sorte de la forme finale après taillage et peut avoir pour conséquence :
• Un contact de la vignette adhésive avec les outils de débordage pouvant engendrer une usure ou une casse des dits outils, en particulier lors de l'usage d'une fraise ou d'un foret.
• Un décollement de la vignette adhésive durant le débordage, ou une non découpe de la vignette adhésive dépassant du contour final, entrainant une infiltration d'eau sous la vignette adhésive pendant le débordage, ce qui peut engendrer une perte totale d'adhésion de la vignette.
• Si la vignette n'est de plus pas située assez exactement à l'emplacement de blocage du gland, certaines zones du pad peuvent être en contact direct avec la lentille, conduisant à un maintien moins robuste de la lentille dans les organes de maintien.

However, incorrect positioning of the adhesive sticker can have negative consequences:

• Sticking the sticker in the wrong place can cause the sticker to come out of the final shape after cutting and can result in:
• Contact of the adhesive sticker with the edging tools which may cause wear or breakage of the said tools, in particular when using a cutter or a drill.
• Detachment of the adhesive sticker during edging, or non-cutting of the adhesive sticker protruding from the final contour, causing water to seep under the adhesive sticker during edging, which can cause a total loss of adhesion of the sticker .
• If the thumbnail is also not located quite exactly at the blocking location of the glans, certain areas of the pad may be in direct contact with the lens, leading to a less robust holding of the lens in the holding members.

However, this operation of bonding the adhesive sticker is difficult for an operator who does not know a priori the final shape of the ophthalmic lens and therefore the position where the glans should preferentially block the lens before the edging operation and therefore the position , see the orientation in the case of a non-circular thumbnail.

The present invention provides a simple, effective and economical solution to this problem.

DISCLOSURE OF THE INVENTION

• le maintien de la lentille ophtalmique avec son contour initial par un support,
• la détermination à partir de données géométriques du contour final à réaliser de la lentille ophtalmique d'un positionnement du contour final à l'intérieur du contour initial de la lentille ophtalmique,
• la formation d'une aide visuelle pour l'utilisateur lui permettant d'appliquer la vignette adhésive sur la lentille ophtalmique avec son contour initial avant débordage de sorte que la vignette adhésive puisse être appliquée à l'intérieur du contour final.

To this end, the subject of the invention is a method for assisting a user in the application of an adhesive label on one face of an ophthalmic lens with an initial contour before edging comprising:

• maintaining the ophthalmic lens with its initial outline by a support,
• the determination from geometric data of the final contour to be produced of the ophthalmic lens of a positioning of the final contour inside the initial contour of the ophthalmic lens,
• the formation of a visual aid for the user enabling him to apply the adhesive label to the ophthalmic lens with its initial contour before edging so that the adhesive label can be applied inside the final contour.

Thanks to the invention, the adhesive label (or holding pad) can be positioned precisely without the risk of coming into contact with the edging tools when cutting the lens to obtain its final shape.

The invention may further comprise one or more of the following aspects taken alone or in combination:

The method may further comprise the determination within said positioning of the final contour of a theoretical position of the blocking glans to block the ophthalmic lens before edging, and the visual aid corresponds to an area centered on the theoretical position of the glans blocking during the edging operation and adapted to indicate this position.

The visual aid has for example a shape making it possible to indicate an orientation and a centering of the adhesive label to be applied in particular in the case where the adhesive label has a non-circular contour.

The visual aid has in particular a shape corresponding to the contour of the adhesive sticker to be affixed.

In the specific case where the adhesive sticker has for example a non-circular elliptical contour, the visual aid indicates the orientation of the adhesive sticker to be affixed corresponding to the orientation of the blocking tassel during the edging operation.

According to an exemplary embodiment, the step of forming a visual aid may comprise forming a visual aid image. It is therefore an immaterial, non-intrusive and contactless visual aid that does not risk damaging the ophthalmic lens.

The method comprises for example the capture with a camera in real time of the images of the ophthalmic lens with its initial contour, maintained by the support and the display in real time of these images on a viewing screen by superimposing the visual aid on these images or by embedding the visual aid in these images.

A display of the final contour of the ophthalmic lens superimposed on said images can also be produced.

According to another embodiment, the formation of a visual aid image comprises the projection of an image of a visual aid onto the ophthalmic lens, in particular with a laser or an image projector.

• la fourniture d'une lentille ophtalmique,
• la fourniture d'un gland,
• la fourniture d'une vignette adhésive,
• la formation d'une aide visuelle pour assister un utilisateur à l'application d'une vignette adhésive sur une face d'une lentille ophtalmique avec un contour initial selon un procédé tel que décrit ci-dessus, comprenant de plus
• le marouflage de la vignette adhésive sur la lentille ophtalmique avec son contour initial avant débordage sensiblement centrée et orientée en fonction de l'aide visuelle,
• la fixation du gland sur la vignette adhésive, ainsi que
• le débordage de la lentille ophtalmique maintenue au moyen dudit gland dans une machine de détourage.

The invention also relates to a method for edging an ophthalmic lens comprising

• the supply of an ophthalmic lens,
• the provision of a tassel,
• the supply of an adhesive sticker,
• forming a visual aid to assist a user in applying an adhesive sticker to one face of an ophthalmic lens with an initial contour according to a method as described above, further comprising
• the rolling of the adhesive label on the ophthalmic lens with its initial outline before edging substantially centered and oriented according to the visual aid,
• fixing the glans on the adhesive label, as well as
• the edging of the ophthalmic lens held by means of said tassel in a trimming machine.

• un support pour maintenir la lentille ophtalmique avec son contour initial,
• une unité de traitement configurée pour déterminer à partir de données géométriques du contour final à réaliser de la lentille ophtalmique un positionnement du contour final à l'intérieur du contour initial de la lentille ophtalmique,
• une unité de formation d'une aide visuelle commandée par l'unité de traitement et configurée pour permettre à un utilisateur d'appliquer la vignette adhésive sur la lentille ophtalmique avec un contour initial avant débordage de sorte que la vignette adhésive puisse être appliquée à l'intérieur du contour final.

The invention also relates to a device for implementing a method as described above, comprising

• a support for holding the ophthalmic lens with its initial outline,
• a processing unit configured to determine from geometric data of the final contour to be produced of the ophthalmic lens a positioning of the final contour inside the initial contour of the ophthalmic lens,
• a visual aid forming unit controlled by the processing unit and configured to allow a user to apply the adhesive sticker to the ophthalmic lens with an initial contour before edging such that the adhesive sticker can be applied to the inside the final outline.

The processing unit is for example configured to determine within the positioning of the final contour the theoretical position of a blocking glans to block the ophthalmic lens during the edging operation, and the forming unit of the The visual aid is configured to form a visual aid centered on the position of a blocking glans, and adapted to indicate that position.

The visual aid may have a shape corresponding to an outline of the adhesive label.

The visual aid forming unit has for example a shape configured to make it possible to indicate an orientation and a centering of the adhesive label to be applied, in the event that the adhesive label has a non-circular outline.

The device comprises for example a camera configured to take real-time images of the ophthalmic lens with its initial outline maintained by the support and the visual aid forming unit comprises a viewing screen configured for real-time display images by superimposing the visual aid on them or by embedding the visual aid in these images.

The visual aid forming unit is in particular configured for a display of the zone corresponding to the position of the final contour of the ophthalmic lens superimposed on said images.

• [Fig.1] est un exemple d'une lentille ophtalmique sur lequel une vignette adhésive a été déposée avec un gland de blocage.
• [Fig.2] est une vue générale en perspective d'un exemple de réalisation d'un dispositif centreur- bloqueur pour la mise ne œuvre d'un procédé selon l'invention ;
• [Fig.3] est un schéma optique simplifié du dispositif de la figure 2 ;
• [Fig.4] est un schéma synoptique d'un exemple du procédé selon l'invention,
• [Fig.5] est un exemple d'un premier écran affiché par le dispositif centreur - bloqueur ;
• [Fig.6] est un exemple d'un second écran affiché par le dispositif centreur - bloqueur ;
• [Fig.7] est un exemple d'un troisième écran affiché par le dispositif centreur - bloqueur.

Other characteristics and advantages of the invention will emerge from the following description, given by way of example and without limitation, with reference to the appended drawings in which:

• [ Fig.1 ] is an example of an ophthalmic lens on which an adhesive sticker has been deposited with a locking tassel.
• [ Fig.2 ] is a general perspective view of an exemplary embodiment of a centering-blocking device for the implementation of a method according to the invention;
• [ Fig.3 ] is a simplified optical diagram of the device of the figure 2 ;
• [ Fig.4 ] is a block diagram of an example of the method according to the invention,
• [ Fig.5 ] is an example of a first screen displayed by the centering-blocking device;
• [ Fig.6 ] is an example of a second screen displayed by the centering-blocking device;
• [ Fig.7 ] is an example of a third screen displayed by the centering-blocking device.

DETAILED DESCRIPTION

In all the figures, the elements having identical functions bear the same reference numbers.

The following achievements are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference is to the same embodiment, or that the features apply only to a single embodiment. Simple features of different embodiments can also be combined or interchanged to provide other embodiments.

On the figure 1 is represented the result of the assembly to be carried out in particular by an operator before an edging operation using the method and the device according to the invention. On the figure 1 an ophthalmic lens 103 is shown with its initial contour 400. On this ophthalmic lens has been affixed, on its convex surface 401, an adhesive label 150 as well as a blocking tassel 152.

To achieve this, we have represented on the picture 2 schematically an embodiment of a centering-blocking device 100 according to the invention making it possible to assist a user in the application of an adhesive label 150 on one face of an ophthalmic lens 103 before the edging operation.

It can be specified that the adhesive label 150 is for example double-sided self-adhesive, for example adhesives of the Rikipad Z-6018 type distributed by VIGteQnos ^© .

This centering-blocking device 100 comprises in particular a work desk 101 on which is placed a mechanism 102 for centering an ophthalmic lens 103. It may be a unifocal, bifocal, trifocal or yet another progressive power addition ophthalmic lens, also commonly referred to as a progressive lens.

In the present application, the terms “glass” or ophthalmic lens denote an organic or inorganic glass substrate, treated or not, depending on whether it comprises one or more coatings of various kinds or whether it remains bare.

In the present case, it is an ophthalmic lens before trimming or edging with an initial circular contour 400, for example with a diameter of 80 mm. The ophthalmic lens 103 may have undergone one or more surface treatments,

The ophthalmic lenses more particularly concerned by the present invention are glasses which comprise a hydrophobic and/or oleophobic surface coating and preferably glasses comprising both a hydrophobic and/or oleophobic surface coating deposited on a mono or oleophobic anti-reflective coating. multilayer, preferably on the two optical faces of said ophthalmic lens.

In fact, hydrophobic and/or oleophobic coatings are generally applied to lenses comprising an anti-reflective coating, in particular of mineral material, in order to reduce their marked tendency to soiling, for example vis-à-vis fatty deposits.

As indicated previously, the hydrophobic and/or oleophobic coatings are obtained by application, on the surface of the anti-reflective coating, of compounds which reduce the surface energy of the glass, which generally implies that the direct application of a blocking tassel on the ophthalmic lens for edging does not allow sufficient support.

The adhesive label 150 has the particular function of raising the surface energy perceived by the blocking tassel temporarily during edging, thus enabling effective maintenance during an edging or trimming operation. In particular the adhesive sticker 150, having a much larger contact surface with the ophthalmic lens 103 than the blocking glans 152, has for its part a sliding adhesion with the surface of the lens 103 greater than that possible with the glans of blocking 152, and in particular an increased adhesion during the application of a tangential force such than that applied during edging. Furthermore, the adhesive label 150 generally has a weaker adhesion, in tearing, than that of the pad of the locking tassel 152, in order to be able to be removed from the surface of the ophthalmic lens 103 following edging.

The centering-blocking device 100 further comprises a display screen 105 fixed to the frame 104 so as to be oriented to be visible to the user working at the work desk 101.

The centering mechanism 102 of the work desk 101 comprises here for example a set of three jaws 114 with concentric clamping each carried by an arm 115 pivoting about an axis (not visible on the picture 2 ) fixed relative to the work desk 101. The arms are arranged so that their joint rotation around their respective axis allows the approximation of the three jaws 114.

The tightening of the jaws 114 is controlled by a motor 117 whose shaft is integral with a pinion 118 meshing with a crown 119 adapted to drive the arms 115 in rotation around their axis.

The arms 115 in fact each comprise a semi-circular toothed portion (not shown) meshing with the outer periphery of the crown 119.

The rotation of the pinion 118, under the action of the motor 117, thus drives the ring gear 119 in rotation to cause the tightening or loosening of the jaws 114, depending on the direction in which the ring gear 119 is driven. An incremental encoder, for example a rotary encoder, allows the motor 117 to know the position of the crown 119.

The assembly formed by the arms 115 carrying the jaws 114, and by the crown 119 is arranged above a support plate 121 adapted to allow light to pass.

Moreover, as shown by the picture 2 , the centering-blocking device 100 comprises a positioning arm 106, preferably automated, connected to the frame 104, and adapted to take using pliers, for example a blocking tassel 152 disposed on a receptacle 107 and to come the deposit at a location determined by calculation on the front face of said ophthalmic lens 103, and in particular on the front face covered with the aforementioned adhesive label 150.

With this in mind, the centering-blocking device 100 is configured to detect the position of a centering and/or alignment mark of the ophthalmic lens 103.

• un support de la lentille ophtalmique 103,
• de part et d'autre dudit support, d'une part, des moyens d'éclairement de la lentille ophtalmique 103 installée sur ledit moyen d'accueil et, d'autre part
• des moyens d'acquisition et d'analyse de la lumière transmise par ladite lentille ophtalmique 103.

For this, as shown schematically in the picture 3 , the centering-blocking device 101 advantageously comprises:

• a support for the ophthalmic lens 103,
• on either side of said support, on the one hand, means for illuminating the ophthalmic lens 103 installed on said receiving means and, on the other hand
• means for acquiring and analyzing the light transmitted by said ophthalmic lens 103.

The support is constituted here for example by a support plate 121 transparent to light and/or by the centering mechanism 102.

According to the example shown, the illumination means comprise in particular a light source S which emits a divergent light beam 1 in the direction of a deflection system comprising a mirror 126 inclined at 45° and a converging lens 123 adapted to form a luminous flux 2 with parallel rays in the direction of the ophthalmic lens 103 placed on the support plate 121 with its front face, provided with the centering and/or alignment marker(s), facing the said convergent lens 123.

The acquisition and analysis means here comprise a digital camera C, image processing means 200 configured to process the signal obtained at the output of the digital camera C and means for displaying the processed signal consisting in particular of the display screen 105. Said acquisition and analysis means comprise between the support plate 121 and the digital camera C an optical system for returning the light beam transmitted by and around the ophthalmic lens 103 comprising in particular a frosted plate 122 forming screen and a mirror 125 inclined at 45°. The digital camera C collects, via the optical angular return operated by the inclined mirror 125, the images or shadows projected on the frosted screen 122.

Advantageously, in the centering-blocking device 100, said ophthalmic lens support, said illumination means and said acquisition and analysis means are fixed relative to each other.

Furthermore, as shown in picture 3 , it comprises a single optical path between said illumination means and said acquisition and analysis means, which has the advantage of reducing the size and manufacturing costs of the device and above all of making it possible to obtain a lasting precision of measurement.

The centering-blocking device 100 described above allows the implementation of a method to assist a user in the application of an adhesive label 150 on one face of an ophthalmic lens 103 with its initial contour 400, in particular circular , before overflow.

This process includes the following steps (see figure 4 ):

During a step 300, the ophthalmic lens 103 is fixed with its initial circular contour 400 in a support formed more particularly by the centering mechanism 102 or the support plate 121. This operation can be followed in real time by the user. on the display screen 105 of the work desk 101. Indeed, the ophthalmic lens 103 is illuminated by rays of parallel light 2 and the initial contour 400 of the ophthalmic lens 103 is visible on the frosted screen 122 and is taken in image by the camera C. The image(s) acquired is/are transmitted to the display screen 105 by the means 200 for image processing. More specifically, the image processing means 200 can detect the initial contour of the ophthalmic lens 103 and replace, for example, in the images transmitted to the display screen 105, all the pixels outside the initial contour detected by pixels of a predefined color such as black, for example.

Furthermore, when fixing the ophthalmic lens 103 on the centering mechanism 102 or placing it on the support plate 121, the user has for example informed via an input interface (not shown) the processing means 200 with geometric and characteristic data of the ophthalmic lens 103, in particular the shape of the final contour 402 (visible on fig. 5 and 6 ) to be made inside the initial contour 400 and the position and orientation with respect to the latter.

During a step 302, a projection or positioning of the final contour 402 inside the initial contour 400 of the ophthalmic lens 103 is determined from geometric data of the final contour 402 to be produced of the ophthalmic lens 103. The data geometry of the final contour 402, or frame data, are obtained either from a database, or, directly or indirectly, from the measurement of a contour of a rim of the spectacle frame or from the measurement of a contour of a presentation eyeglass lens initially mounted in said frame. Furthermore, the determination of the projection or the positioning of the final contour 402 inside the initial contour 400 of the ophthalmic lens 103 is obtained either from a database or from a file, having been determined in a previous step. , or by calculation, by means of a processor, taking into account said frame data, wearing data and centering data of the ophthalmic lens. The wearing data here express quantities measured in the condition of wearing, real or virtual, of the frame by the wearer, or end user. The wearing data are for example linked to the position of the pupil of the wearer with respect to the position of the outline of the ophthalmic lens in the wearing condition. These are for example the so-called height data, pupillary distance (PD), boxing data. The lens centering data here express the data corresponding to the position of the wearer's pupil relative to the geometry of the optical surfaces of the spectacle lens. These centering data are generally associated with an optical center of the ophthalmic lens, or an assembly mark, a near vision zone, a distance vision zone, etc. This assembly data can come from a database or a file or be extracted by means of the centering machine, by identifying, automatically or manually, either micro circles or ink markings on the ophthalmic lens 103 to overflow, such as a fitting cross or an optical center marker...etc.

Then during a step 304, a visual aid is created for the user allowing him to apply the adhesive sticker 150 to the ophthalmic lens 103 with its initial contour 400 before edging so that the adhesive sticker 150 can be applied to the inside the final contour 402 and at the exact position of the blockage. The images are therefore displayed, for example, on the display screen 105 by superimposing or embedding them on these images taken by the camera C on final outline 402 of ophthalmic lens 103 as a visual aid. The step of forming a visual aid therefore comprises forming a visual aid image which may be displayed on the screen or, according to another embodiment, be projected as an image by an image projector or a laser on the ophthalmic lens 103.

The figure 5 shows an example of a display of a display screen 105 preliminary to the step of using the visual aid of the invention. On this figure 5 , the processing means 200 have displayed a photo taken by the camera C and replaced the pixels outside the initial outline 400 with black pixels. Inside the initial outline 400, the processing means 200 have projected a final outline 402 of the ophthalmic lens 103 to be produced. Thus, the user is able to check, for example, that the positioning of the final contour of the ophthalmic lens, of the centering point, corresponding to a point of the ophthalmic lens intended to be facing the wearer's pupil in wearing condition. the ophthalmic lens, which have been determined by the machine, match the image of the ophthalmic lens and in particular any mounting marks visible on the ophthalmic lens. Furthermore, it is possible to verify that the positioning of the final contour of the ophthalmic lens is indeed included in the initial contour of the ophthalmic lens. Here the centering point corresponds to the white cross visible on the photo.

According to one embodiment of the invention, the operator, or an optician manipulating the centering blocker according to the invention can activate the visual aid function by selecting a corresponding button on the display screen. Alternatively, the visual aid function can be systematic or pre-programmed. The display screen then changes to that of the figure 6 . Images taken by the camera are then continuously displayed on this screen, in real time, without necessarily the processing means 200 artificially suppressing the support means of the ophthalmic lens. The processing means 200 determine inside the projection or the positioning of the final contour 402 the theoretical position of a blocking gland 152 which will be used to block the ophthalmic lens 103 before edging and determines the position of a visual aid indicating to the user an area corresponding to the desired position for gluing the thumbnail.

In some cases, the adhesive sticker 150 has a non-circular elliptical outline with a central hole, and the processing means 200 show on the display screen a visual aid in the form of an inlaid sticker outline 406 and central hole 404 in the image which indicates inside the final outline 402 the orientation of the adhesive label 150 to be affixed. Thus, while looking at the display screen 105, the user is able to affix the adhesive sticker 150 precisely by rolling. and produced by overlaying visual information (here the image of the contour 406 of the thumbnail and/or of the final contour 402) which are displayed on the screen at the same time as the shot taken by the camera C of the ophthalmic lens 103. This overlay can be done by replacing certain pixels displayed by a specific color, for example red or black.

According to an alternative not shown, the visual aid comprises an erasable or temporary marking device on the ophthalmic lens 103 with its initial outline 400 which indicates the final outline 402 and/or an area 404 corresponding to the position of the blocking tassel 152 during of the edging operation and/or a thumbnail outline 406. This is therefore a temporary physical marking by affixing material.

In general, the visual aid includes centering indicators for the adhesive label 150 and orientation indicators for said adhesive label 150. Thus, in the example above, the elliptical contour is both an indicator of the orientation of the adhesive sticker 150, but also an indicator making it possible to optimally position the center of the adhesive sticker. This second aspect is reinforced by the presence of a representation 404 of the hole present in the middle of the adhesive label 150.

However, instead of forming a visual aid with an outline similar or identical to the thumbnail used, it is possible to form any other visual aid allowing centering and orientation of the visual aid. By way of examples of alternatives, the visual aid may comprise a series of markers making it possible over time to correctly orient the adhesive sticker 150 along its main axis or long axis (by the major axis of the ellipse if the sticker is elliptical), then another series of markers allowing in a second time to position the center of the thumbnail to the desired position. For example, it can be the formation of one or more parallel lines 411 to a long axis of various sizes allowing to deduce a center 413 as shown by way of example on the figure 7 .

This may be the formation of lines 415 along a long axis and lines 417 along a short axis, the two said axes crossing, said lines 415 and 417 possibly comprising end of line indicators such as arrows or dots. Alternatively there may be only one thumbnail center mark instead of that corresponding to the hole outline 404, for example by means of a circle and one or more marks indicating a long axis direction relative to the center , for example strokes (see also figure 7 ). Alternatively, it may be a total or partial combination of several of the above examples or even other alternative means.

According to certain alternatives, the final contour 402 of the ophthalmic lens is displayed during the formation of the visual aid, for example by display on a viewing screen. According to other alternatives, the visual aid is formed or displayed alone, without the presence of the final outline of the ophthalmic lens.

It is therefore understood that the present invention makes it possible to affix in the end, for example by an operator and by smoothing, in a precise manner an adhesive label 150 on an ophthalmic lens 103 before edging to allow effective maintenance during trimming operations.

After said smoothing, the tassel can be attached to the adhesive label present on the ophthalmic lens and the latter can be trimmed or overflowed easily.

Claims (16)

1. Method for assisting a user in applying an adhesive sticker (150) by roller-pressing to a face of an ophthalmic lens (103) with an initial contour (400) prior to edging, the method comprising:

   - maintaining the ophthalmic lens (103) with its initial contour (400) using a support (102; 121),

   - determining, from geometric data of the final contour (402) to be produced for the ophthalmic lens (103), a positioning of the final contour (402) inside the initial contour (400) of the ophthalmic lens (103),

   - forming a visual aid for the user, allowing them to apply the adhesive sticker (150) by roller-pressing to the ophthalmic lens (103) with its initial contour (400) prior to edging, such that the adhesive sticker (150) can be applied by roller-pressing inside the final contour (402).
2. Method according to Claim 1, further comprising determining, within said positioning of the final contour (402), a theoretical position of the block (152) for blocking the ophthalmic lens (103) prior to edging, and the visual aid corresponding to a zone (402) centred on the theoretical position of the block (152) during the edging operation and adapted to indicate this position.
3. Method according to either of Claims 1 and 2, in which the visual aid has a shape making it possible to indicate an orientation and a centring of the adhesive sticker that is to be applied.
4. Method according to Claim 3, in which the visual aid has a shape corresponding to the contour of the adhesive sticker that is to be affixed (406).
5. Method according to any one of Claims 1 to 4, in the case where the adhesive sticker (150) has a non-circular elliptical contour, in which the visual aid indicates the orientation of the adhesive sticker to be affixed (406) corresponding to the orientation of the block (152) during the edging operation.
6. Method according to any one of Claims 1 to 5, in which the step of forming a visual aid comprises forming a visual aid image.
7. Method according to any one of Claims 1 to 6, comprising capturing with a camera (C), in real time, images of the ophthalmic lens (103) with its initial contour (400), maintained by the support (102; 121), and the real-time display of these images on a viewing screen (105) by superimposing the visual aid on these captured images or by embedding the visual aid in these captured images.
8. Method according to Claim 7, comprising displaying the final contour (402) of the ophthalmic lens (103) superimposed on said images.
9. Method according to Claim 6, in which forming a visual aid image comprises projecting an image of a visual aid onto the ophthalmic lens (103), in particular with a laser or an image projector.
10. Method for edging an ophthalmic lens (103), comprising

    - providing an ophthalmic lens (103),

    - providing a block (152),

    - providing an adhesive sticker (150),

    - forming a visual aid in order to assist a user in applying an adhesive sticker (150) to a face of an ophthalmic lens (103) with an initial contour (400) according to any one of Claims 1 to 7, further comprising

    - roller-pressing the adhesive sticker (150) onto the ophthalmic lens (103) with its initial contour (400) prior to edging, substantially centred and oriented according to the visual aid,

    - fixing the block (152) on the adhesive sticker (150), and also

    - edging the ophthalmic lens (150), maintained by means of said block (152), in a trimming machine.
11. Device (100) for implementing a method according to any one of Claims 1 to 10, comprising

    - a support (102, 121) for maintaining the ophthalmic lens (103) with its initial contour (400),

    - a processing unit (200) configured to determine, from geometric data of the final contour (402) to be produced for the ophthalmic lens (103), a positioning of the final contour (402) inside the initial contour (400) of the ophthalmic lens (103),

    - a unit for forming a visual aid controlled by the processing unit (200) and configured to allow a user to apply the adhesive sticker (150) by roller-pressing to the ophthalmic lens (103) with an initial contour (400) prior to edging, such that the adhesive sticker (150) can be applied inside the final contour (402).
12. Device according to Claim 11, in which the processing unit (200) is configured to determine, within the positioning of the final contour (402), the theoretical position of a block (152) for blocking the ophthalmic lens (103) during the edging operation, and the unit for forming the visual aid is configured to form a visual aid (406) centred on the position of a block (152) and adapted to indicate this position.
13. Device according to either of Claims 11 and 12, in which the visual aid (406) has a shape corresponding to a contour of the adhesive sticker (150).
14. Device according to either of Claims 11 and 12, in which the unit for forming the visual aid has a shape configured to permit indication of an orientation and a centring of the adhesive sticker that is to be applied by roller-pressing.
15. Device according to any one of Claims 11 to 14, in which it comprises a camera (C) configured to take real-time images of the ophthalmic lens (103) with its initial contour (400) maintained by the support (102, 121), and the unit for forming the visual aid comprises a viewing screen (105) configured for real-time display of the images by superimposing the visual aid on them or by embedding of the visual aid therein.
16. Device according to any one of Claims 11 to 15, in which the unit for forming the visual aid is configured to display the zone (404) corresponding to the position of the final contour (402) of the ophthalmic lens (103) superimposed on said images or embedded in them.

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