EP3662321A1 - Procédé de détermination de caractéristiques dimensionnelle s d'un article de vision, et procédé de fabrication et article de vision correspondant - Google Patents
Procédé de détermination de caractéristiques dimensionnelle s d'un article de vision, et procédé de fabrication et article de vision correspondantInfo
- Publication number
- EP3662321A1 EP3662321A1 EP17755219.7A EP17755219A EP3662321A1 EP 3662321 A1 EP3662321 A1 EP 3662321A1 EP 17755219 A EP17755219 A EP 17755219A EP 3662321 A1 EP3662321 A1 EP 3662321A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- head
- virtual
- dimensional
- article
- vision
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C13/00—Assembling; Repairing; Cleaning
- G02C13/003—Measuring during assembly or fitting of spectacles
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/107—Measuring physical dimensions, e.g. size of the entire body or parts thereof
- A61B5/1071—Measuring physical dimensions, e.g. size of the entire body or parts thereof measuring angles, e.g. using goniometers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/107—Measuring physical dimensions, e.g. size of the entire body or parts thereof
- A61B5/1072—Measuring physical dimensions, e.g. size of the entire body or parts thereof measuring distances on the body, e.g. measuring length, height or thickness
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/107—Measuring physical dimensions, e.g. size of the entire body or parts thereof
- A61B5/1079—Measuring physical dimensions, e.g. size of the entire body or parts thereof using optical or photographic means
Definitions
- the present invention relates to a method for determining the dimensional characteristics of an article of vision, and a corresponding system. It finds particular application in the field of eyewear, particularly for the fitting and manufacture of pairs of glasses, or more simply glasses, adapted to a given person, for the correction of eyesight, eye protection such as for example against light rays, projectiles, projections, or as a fashion accessory.
- Eyeglasses The most common eyeglasses are eyeglasses and sunglasses or their combination. Eyeglasses help to overcome visual defects while sunglasses, sometimes called sunglasses, protect the eyes from sunlight. It is also possible to find glasses for sport or professional use.
- a pair of glasses consists of a frame on which glasses are attached. It rests on the nose at the level of two nose supports, and on the ears at the free ends of two branches.
- the nose supports can be included in the body of the mount or be mounted independently.
- the glasses can be linked together directly by a bridge or indirectly by a strapping glasses.
- glass in the field of eyewear generally refers to a mineral material (based for example on silica) or organic (based on polymers such as polycarbonate, commercial Trivexe polymer, etc.).
- the branches are stems generally articulated on the sides of the frame and whose free ends are often bent to extend behind the ears and hold the glasses and the frame in front of the eyes.
- a curve of the frame is more or less pronounced. This curve corresponds to the curve or convexity that form the glasses and the bridge to match the horizontal curve or convexity of the face.
- Too small glasses will produce uncomfortable compression in the long term at the temples, or even cause headaches. Glasses that are too big or too wide can slip on your nose and fall.
- the frame should be as close to the face as possible and should rest properly on the bridge of the nose. It is therefore imperative to try the glasses in order to find the right size and to be able to adjust them better to the unique morphology of each face.
- a telescope model is often available with only three variable parameters: the width of the glasses, the size of the bridge and the length of the branches. These parameters are set in advance and can not be changed. In addition, each parameter is set according to a limited number of sizes. For example, there are three lengths of branches that can be considered as standards: 135mm, 140mm and 145mm. It is therefore always problematic to find glasses perfectly adapted to one's own body.
- a solution is proposed in FR 3 024 911.
- This solution allows the customer to obtain glasses after a virtual fitting adapted to its unique morphology.
- a database of adjustable three-dimensional digital virtual spectacles is formed.
- a digital capture of the client's facial morphology is performed, coupled with a digital capture of the texture of the face, to form a three-dimensional digital avatar of the client's face.
- a technique of projecting patterns of light beams on the face, then capturing and processing images of the projected patterns is used to capture the morphology of the client's face.
- morphological data are extracted from the digital avatar and the adjusted virtual glasses corresponding to these morphological data are obtained in the database.
- the adjusted virtual glasses chosen are then displayed on the avatar, and one can move on the screen virtually all of the avatar and adjusted virtual glasses, to view the result from different angles for example.
- One of the problems posed by the method and the system described in this document is that they are based in particular on the correct positioning of patterns by the optician on the face, to extract the morphological data, which takes time and creates a risk of human error.
- this method and system rely on the use of several fixed sensors. They are therefore complex, in particular in that they require the calibration of different sensors relative to each other, expensive and bulky. The corresponding system can hardly be transported outside a conventional point of sale, or within the same point of sale from one station to another.
- the invention aims to provide a device and a method for determining the dimensional characteristics of a vision article such as glasses, which is reliable, mobile and easy to use.
- the subject of the invention is a method for determining the dimensional characteristics of an article of vision, such as spectacles, adapted to a given person, by a determination system comprising:
- a database in which are stored one or more dimensional characteristics of at least one vision article.
- the processing and capture means determine a three-dimensional numerical representation of all or part of the head, or virtual head, of the given person,
- the database is updated by the processing means so as to adapt the dimensional characteristic (s) (4) of the sight article (s) stored in the database to said determined morphological characteristics.
- Morphological features include the shape and / or position and / or dimension of at least one element of the head.
- the determination of these morphological characteristics comprises the automatic recognition of said element in the virtual head by the processing means and the automatic determination by the coordinate processing means of at least one remarkable point of said element in a three-dimensional coordinate system in the virtual head.
- the method further comprises one or more of the following features, taken in isolation or in any technically feasible combination:
- the system comprises display means, and the method comprises determining, by the processing means, a three-dimensional digital representation of a vision article, or virtual vision article, from the dimensional characteristics stored in the database data, and display on the display means, by the processing means, the virtual head and the virtual vision article superimposed on said virtual head;
- the method comprises the virtual displacement by moving means, the virtual vision article and the virtual head displayed by the display means, so as to enable a user to view the virtual vision article on the head virtual from different angles of view;
- the element of the head is included in the list: eyes, nose, ear, eyebrow, cheekbone, temple;
- the remarkable points of the element correspond to the remarkable points for the determination of the width of the nose at the level of the internal canthus, and / or the angles of the face of the nose, and / or the position of the sphenoids, and / or the position upper ear, and / or the position of the pupils, and / or the position of the external canthus, and / or the angles of flush of the nose, and / or the height of the eyebrows, and / or the position of the cheekbones, and / or the position of the temples;
- the determination of the virtual head comprises capturing, by the capture means, several three-dimensional images of all or part of the head by 360 ° rotation around the head;
- the determination, by the processing means, of the virtual head comprises the reconstruction of said virtual head from each of the three-dimensional images captured by the capture means;
- the dimensional characteristics of the vision article are included in the list: overall width, top height of the template, lower height of the template, width of the deck, angle of view, angle of flush, mounting curve, length of the branches, curves branches, inclination of the plane of the frame, optical center of the glasses.
- the subject of the invention is also, according to a second aspect, a method of manufacturing an article of vision, such as spectacles, adapted to a given person, in which:
- suitable dimensional characteristics of the article of vision are determined by implementing the method as presented above,
- said adapted dimensional characteristics are transmitted to an article of vision manufacturing device
- the vision article adapted to the given person is manufactured so that it has said adapted dimensional characteristics.
- the subject of the invention is also an article of vision, such as glasses, adapted to a given person, manufactured by the manufacturing method as presented above, so that the article of vision presents dimensional characteristics adapted to the given person.
- the object of the invention is, according to a fourth aspect, a system for determining the dimensional characteristics of an article of vision, such as spectacles, adapted to a given person, comprising:
- the processing means are configured to: determining a three-dimensional numerical representation of all or part of the head, or virtual head, of a given person, from information provided by the capture means,
- the morphological features include the shape and / or position of at least one element of the head, and the processing means is configured to automatically recognize the element in the virtual head and to automatically determine the coordinates of at least one point remarkable of said element in a three-dimensional reference in the virtual head.
- system further comprises one or more of the following features, taken in isolation or in any technically feasible combination:
- the system comprises display means, and the processing means is configured to determine a three-dimensional digital representation of a vision article, or virtual vision article, from the dimensional characteristics stored in the database, and display on the display means the virtual head and the virtual vision article superimposed on said virtual head;
- the system comprises moving means configured to allow virtual movement of the virtual vision article and the virtual head displayed by the display means, so as to enable a user to view the virtual vision article and the virtual head from different angles of view;
- the element of the head is included in the list: eyes, nose, ear, eyebrow, cheekbone, temple;
- the processing means are configured to automatically determine the coordinates of the points of interest for the determination of the width of the nose at the internal canthus, and / or the nose face angles, and / or the position of the sphenoid and / or the position of the supra-auricular points, and / or the position of the pupils and / or the position of the external canthus, and / or the angles of flush of the nose, and / or the height of the eyebrows, and / or the position of the cheekbones, and / or the position of the temples; the processing means are configured to reconstruct the virtual head from several three-dimensional images of all or part of the head captured by the capture means by 360 ° rotation around the head; the dimensional characteristics of the vision article are included in the list: overall width, top height of the template, lower height of the template, width of the deck, angle of view, angle of flush, mounting curve, length of the branches, curves branches, inclination of the plane of the frame, optical center of the glasses.
- the invention enables an optician to quickly and simply visualize and reposition customer-adapted virtual glasses, represented on the representation of the face of this customer, with a limited risk of human error in the process. It also allows a mobile implementation, with a lightened and mobile device
- Figure 1 schematic representation of an adjustable three-dimensional digital virtual eyeglass base of the method and system according to the invention
- FIG. 2 schematic representation of a morphological survey device of the method and system according to the invention
- FIG. 3 schematic representation of one of the steps of the determination method according to the invention.
- Figure 4 schematic representation of another of the steps of the determination method according to the invention.
- Figure 5 schematic representation of the manufacturing method according to the invention.
- Figure 6 schematic representation of a front view of an example of a three-dimensional digital model of glasses
- FIG. 7 schematic representation of a front view of a person's face
- Figure 8 schematic representation of a front view of a three-dimensional model of a nose
- Figure 9 schematic representation of a profile view of a person's face.
- the invention thus relates to the determination of the dimensional characteristics of an article of vision adapted to a person, particularly during a phase fitting and for the realization of this custom vision article, adapted to the morphology of the face of the person.
- the invention concerns the determination of the dimensional characteristics of a vision article such as a pair of spectacles, adapted to a given person, by three-dimensional fitting of fitted virtual spectacles. 1.
- This base 2 contains a catalog of virtual glasses 3. Its access can be made by a local or remote connection, such as for example by an internet connection .
- the virtual glasses 3 are adjustable according to various parameters 4 which will be described in more detail later in the present description. These parameters or dimensional characteristics 4 correspond to remarkable points of the morphology of a person. These remarkable points being defined by spatial coordinates Xo, Yo and Zo within a three-dimensional coordinate system. By “adjustable” is meant the possible change of value of the parameter to adopt a new value.
- a three-dimensional numerical representation 9 of all or part, in particular of the face, of the head 5 of the person is determined.
- This three-dimensional digital representation 9 is called virtual head 9, and is obtained by processing means 14, such as the processor of a computer associated with a memory, and capture means 7.
- the processing means 14 can be local or remote means, which can be accessed by means of wire or non-wire connection, such as an internet connection for example.
- the capture means 7 comprise at least one three-dimensional image sensor 8.
- the sensor 7 is rotated 360 ° around the person's head 5, a motion in which several three-dimensional images 8 are captured by the sensor 7.
- the capture means 7 can include means for the sensor 7 to move automatically 360 ° around the head 5. Alternatively, the sensor 7 can be moved manually by an operator.
- one or more manual laser scanner type devices 7 which create three-dimensional images 8 by triangulation: a point, or a laser line, is projected on the head 5 and a sensor (for example a sensor of the "charge” type).
- a sensor for example a sensor of the "charge” type.
- coupled device “or CCD, or” position sensitive device “or PSD) measures the distance to the surface of the head 5.
- the positions thus measured are recorded with respect to an internal coordinate system. Since the scanner itself is in motion, its position must also be measured in the same coordinate system.
- Such an apparatus may be in the form of a three-dimensional measuring machine, equipped with an incorporated camera (to define the orientation of the scanner), or in the form of a photo grammetry apparatus using three or more cameras authorizing the six degrees of freedom of the scanner.
- These two techniques generally use infrared leds incorporated in the scanner that are perceived by the camera (s) through filters to see them regardless of the ambient lighting.
- the information is collected by the processing means 14, and recorded as the coordinates of points in a three-dimensional space. By triangulation, this information is converted by the processing means 14 into a canvas, then into a three-dimensional mathematical and computer model corresponding to the virtual head 9, most often in the form of surfaces of the "Non-Uniform Rationa! Type.
- Basis Spiines "or NURBS.
- some of these hand-held laser scanners can associate this data with passive visible light receivers, which record textures and colors. This makes it possible to create an even more complete three-dimensional digital representation or modeling 9 of the head 5, which integrates texture and color information.
- the three-dimensional images 8 thus captured are then transmitted to the processing means 14, and used by them to build, according to an algorithm of the state of the art, the virtual head 9.
- the virtual head 9 which corresponds to a digitized three-dimensional model 9 of the head 5, accurately representing all or part of the head 5 of the person, including his face 5.
- the virtual head 9 can then be displayed by display means 12 such as the screen 12 of a computer, and the person can see themselves as in a mirror.
- the processing means 14 then proceed to a determination of one or more morphological characteristics of the head 5 of the person, starting from the virtual head 9.
- the processing means 14 are configured to automatically recognize one or more elements 19 whose shape and / or position and / or dimension are characteristic of the morphology of the person, in the virtual head 9. Once the One or more of its recognized elements 19, the processing means 14 can automatically determine the spatial coordinates 10 of one or more remarkable points of this element 19 in a three-dimensional coordinate system.
- the database 2 is consulted and updated: the values of the dimensional characteristics 4 of the stored pair of glasses 1, 3 stored in this database 2 are adjusted so as to be adapted to the morphological characteristics previously determined.
- the dimensional characteristics of the adapted virtual glasses 1, 3 are thus obtained which can be used for virtual fitting.
- the virtual fitting leads to the selection by the user of a pair of specific virtual glasses 1, 3, and the dimensional characteristics can then be used to manufacture the selected glasses adapted to the person.
- adjustable values of glasses 1, 3 change and adopt new values. These latter values are derived from the morphological data 10.
- the catalog of adjustable virtual spectacles 1, 3 thus becomes completely adjusted and adapted to the unique morphology of the person's face 5, for example a client of an optician.
- the fitted virtual glasses 1 are thus a three-dimensional visual and / or visualizable model of physical glasses 11.
- the virtual glasses 1 are perfectly adapted to the morphology of the client.
- the customer may for example choose a collection of virtual glasses 1.
- a trombinoscope of the virtual head 9 of the customer in three dimensions carrying the collection of virtual glasses 1 on-measure can be generated.
- the customer can then choose the model and / or shape of glasses that suit him among the virtual collection, then select the pattern, the color, the material, etc .... These selections are integrated into the virtual digital representation of the glasses 1 , and appear on the screen 12 in accordance with the customer's choice.
- the virtual glasses 1 can then be displayed alone and / or on the virtual head 9.
- the customer can view his virtual head 9 remotely as, for example via a connection through a communication network, such as the Internet, and to choose his adjusted virtual glasses 1 when he decides .
- a communication network such as the Internet
- the physical glasses 11 perfectly adjusted to the morphology of the person can then be manufactured. To do this, the dimensions of the fitted virtual glasses 1 are transmitted to a manufacturing device that manufactures the physical glasses so that they have the dimensional characteristics determined.
- the dimensions of the fitted virtual spectacles 1 are transcribed into commands for producing the custom-made physical spectacles 11. These commands are transmitted to a device for controlling the production of the custom-made physical spectacles 11, which controls the production by a device manufacturing 24 from these commands.
- This manufacture consists of machining and / or selecting existing parts, such as the branches and the (or) support (s) glasses, then assemble them, or even add organs and / or additional elements corresponding to virtual glasses 1.
- the assembly, or parts thereof, may be manufactured individually by numerically controlled milling machines or three-dimensional printers.
- the physical glasses 11 are unique and perfectly adjusted to the client's morphology.
- the morphological features include one or more outstanding points for determining the width 150 of the nose 15 at the inner canthus 16, and / or the face angles 151 of the nose 15, and / or the position of the sphenoidal 17, and / or the position of the super-auricular points 18 of the virtual head 9.
- the width 150 of the nose 15 at the internal canthus 16 in women is between 12 and 16 mm, while in men it is between 16 and 20 mm.
- the positions of the supra-auricular points 18 are at the junction point between the ear and the skull.
- the angles of the face 151 are the right and left angles between the vertical 152 with respect to the nose 15 of the client and the tangents 153 at the sides of the nose 15. These angles are of a very general average of 23 degrees in the women and 20 degrees in men.
- the morphological features 10 also include one and / or the following additional corresponding additional points: pupil positions 19, external canthus positions 20, nose 15 flush angles 15, eyebrow heights 21, positions 21. cheekbones 22, positions of the temples 23.
- the right and left flush angles 154 of the nose 15 are between the horizontal 155 with respect to the nose 15 and the walls 156 of the nose 15. These angles are on average 25 degrees in women and 22 degrees in men.
- the heights 210 of the eyebrows 21 are measured from the line 200 of the outer canthus 20 in the vertical axis 190 of the pupils 19 to the base 211 of the eyebrows 21. These heights are on average 17 mm.
- the three-dimensional digital glasses 3 are adjustable according to any number of parameters or dimensional characteristics 4.
- the values of these parameters 4 are modified to correspond to the values of the morphological characteristics determined from the virtual head 9. More precisely, the values of the spatial coordinates resulting from the morphological characteristics 10 are used to intervene on these parameters 4 of at least one of the glasses 3 of the catalog 2, or of the database 2, preferably all the glasses 3 of this catalog.
- the dimensional characteristics 4 comprise among others an overall width 30, upper and lower heights of the caliber 31a, 31b, a width 320 of the bridge 32, a front angle 321, hunting angles, a curve of the frame 33, a length of the branches, a curve of the branches, an inclination 340 of the plane 34 of the frame 33, optical centers 350 of the glasses 35.
- the overall width 30 is the portion of the three-dimensional adjustable digital spectacle model 3 that includes the largest width. This width 30 is determined as a function of the distance between the two sphenoids 17.
- the length of the branches is determined according to the positions of the supra-auricular points 18.
- the heights 31a, 31b of the templates are determined according to the heights 210 of the eyebrows 21 and the positions of the cheekbones 22.
- the bridge 32 is the part of the frame 33 which joins the two lenses 35 and is often used as a support on the nose 15.
- the size of the bridge 32 is determined according to the width of the nose 15
- the curve of the branches is determined according to the position or prominence of the temples 23.
- the parameters of the front angles 321 and flush have modifiable values to adapt to the front angles 151 and flushing 154 of the nose 15 of the virtual head 9.
- the curve of the frame 33 corresponds to the convexity more or less pronounced that form the glasses 35 and the bridge 32 to match the horizontal convexity 36 of the face 5 of the customer.
- the lenses 35 fit into a plane 34 of the frame. This plane has an inclination or an angle 340 relative to the vertical plane 341 of the face 5 of the client. In general, this angle 340 is of the order of 10 degrees.
- the positions of the optical centers 350 make it possible to position these centers 350 exactly in front of the pupils 19 of the client.
- the glasses 35 can therefore be perfectly adjusted.
- the modification of the dimensional characteristics 4 of the virtual spectacles 1 as a function of the morphological characteristics of the client makes it possible to produce three-dimensional custom-made virtual spectacles that perfectly adapt to the morphological characteristics of the virtual head 9 of the client, and allows Moreover, to manufacture physical glasses 11 that fit perfectly to the customer.
- the present invention is given by way of example and is not limiting of the invention.
- the invention is not limited to the field of spectacles in the classical sense, but extends to the more general field of vision articles (eyeglasses, glasses for the practice of a sport or a trade, monocle, binocle, etc.).
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Medical Informatics (AREA)
- Surgery (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Dentistry (AREA)
- Molecular Biology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- General Physics & Mathematics (AREA)
- Ophthalmology & Optometry (AREA)
- Optics & Photonics (AREA)
- Processing Or Creating Images (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/FR2017/052186 WO2019025665A1 (fr) | 2017-08-03 | 2017-08-03 | Procédé de détermination de caractéristiques dimensionnelle s d'un article de vision, et procédé de fabrication et article de vision correspondant |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3662321A1 true EP3662321A1 (fr) | 2020-06-10 |
Family
ID=59683600
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17755219.7A Pending EP3662321A1 (fr) | 2017-08-03 | 2017-08-03 | Procédé de détermination de caractéristiques dimensionnelle s d'un article de vision, et procédé de fabrication et article de vision correspondant |
Country Status (2)
Country | Link |
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EP (1) | EP3662321A1 (fr) |
WO (1) | WO2019025665A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4137878A1 (fr) * | 2021-08-18 | 2023-02-22 | Luxexcel Holding B.V. | Procédé de production d'une prothèse visuelle personnalisée et prothèse visuelle |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6792401B1 (en) * | 2000-10-31 | 2004-09-14 | Diamond Visionics Company | Internet-based modeling kiosk and method for fitting and selling prescription eyeglasses |
US7016824B2 (en) * | 2001-02-06 | 2006-03-21 | Geometrix, Inc. | Interactive try-on platform for eyeglasses |
JP6099232B2 (ja) * | 2013-08-22 | 2017-03-22 | ビスポーク, インコーポレイテッド | カスタム製品を創作するための方法及びシステム |
FR3024911B1 (fr) | 2014-08-14 | 2017-10-13 | Oyyo | Procede d'essayage et de fabrication de lunettes |
NL2014891B1 (nl) * | 2015-05-29 | 2017-01-31 | Maydo B V | Werkwijze voor het vervaardigen van een brilmontuur dat is aangepast aan een brildrager. |
-
2017
- 2017-08-03 EP EP17755219.7A patent/EP3662321A1/fr active Pending
- 2017-08-03 WO PCT/FR2017/052186 patent/WO2019025665A1/fr unknown
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WO2019025665A1 (fr) | 2019-02-07 |
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