WO2022218693A1 - Monture de lunettes individualisée et procédé de génération de données géométriques de celle-ci - Google Patents

Monture de lunettes individualisée et procédé de génération de données géométriques de celle-ci Download PDF

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Publication number
WO2022218693A1
WO2022218693A1 PCT/EP2022/058289 EP2022058289W WO2022218693A1 WO 2022218693 A1 WO2022218693 A1 WO 2022218693A1 EP 2022058289 W EP2022058289 W EP 2022058289W WO 2022218693 A1 WO2022218693 A1 WO 2022218693A1
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WO
WIPO (PCT)
Prior art keywords
spectacle frame
model
head
ear
earpiece
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PCT/EP2022/058289
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German (de)
English (en)
Inventor
Daniel MIKO
Dominik Bidmon
Original Assignee
YOU MAWO GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by YOU MAWO GmbH filed Critical YOU MAWO GmbH
Priority to EP22719532.8A priority Critical patent/EP4323833A1/fr
Publication of WO2022218693A1 publication Critical patent/WO2022218693A1/fr

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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

Definitions

  • the present invention relates to the generation of geometric data that represents a geometry of a spectacle frame customized for a specific person, as well as spectacle frames or assembly kits for them that are additively manufactured on the basis of the geometric data.
  • the spectacle frames used today are non-individualized mass-produced products, which may only be adapted after they have been completely manufactured, e.g. by the optician, by adapting the shape, such as by heating and/or bending or other effects on the otherwise already completely manufactured spectacle frame to the geometry of the head of the person for whom the glasses are intended.
  • the shape of the earpieces of the glasses is regularly adapted manually to the geometry of the person's head in this way only after the actual glasses frame has been manufactured.
  • the earpieces of the glasses frame which are initially manufactured in a predetermined, non-individualized form, are then bent manually in many cases to form or change an earpiece bend along the earpiece, in order to improve the adjustment of the earpiece and thus the glasses frame as a whole in terms of position, shape and dimension of the person's ear in question.
  • bespoke glasses in which a frame is produced from the outset specifically for a specific person or their head geometry. In this way it is possible in particular to optimize the fit of the spectacles on the person's head, in particular with regard to a comfortable fit or an adapted size of the receptacles for the spectacle lenses.
  • the present invention is based in particular on the object of further improving the generation of geometric data for an individualized spectacle frame and a spectacle frame resulting from production depending on such geometric data, in particular with regard to a good and stable fit on the person's head.
  • a first aspect of the invention relates to a method, in particular a computer-implemented method, for generating geometry data which represent a geometry of a spectacle frame customized for a specific person.
  • the method has: (i) detecting (in particular receiving) or generating (in particular measuring by means of a sensor device) biometric head model data which is a virtual multi-dimensional model (in particular polygon model) of the head of the person for at least one partial area of the person including the two ears of the person represent head; (ii) Acquiring (in particular receiving) or generating (in particular measuring by means of a sensor device) initial spectacle frame data which shows an initial geometry of a specific spectacle frame based on specific parameter values of a geometric, in particular virtual, model (in particular a polygon model) of a spectacle frame that has been parameterized by a parameter set with a plurality of parameters define; (iii) Automated (ie at least partially automated) adaptation of the initial geometry of the spectacle frame to the model of the head, modified spectacle frame data being generated by correspondingly changing at least one parameter value of the parameter set, which data represent a geometry of the spectacle frame adapted to the model of the head; and (iv) providing the modified spectacle frame data as geometric data, in
  • the adaptation of the initial geometry of the spectacle frame to the model of the head includes: Defining at least one parameter value of the parameter set depending on a position of an ear root point of the ear assigned to an ear piece of the spectacle frame on the head determined from the head model data and on a defined length offset related to the ear root point , which for the ear piece determines the location of an ear piece kink along the course of the ear piece in the model of the eyeglass frame.
  • ear root point in relation to a human ear (or a model thereof) means a point on the head at which, from Seen from the face, the arched upper edge of the auricle of the ear arises from the head. It is therefore typically very easy to detect when generating the head model data, in particular when scanning the head from several sides, and can therefore be located on the model of the head, so that it can serve as a reliable reference point for determining the location of the earpiece bend.
  • An absolutely exact determination of an ideal ear root point is less relevant here than the determination of a point in the immediate vicinity (e.g radius of 1-2 mm) of the base of the ear, where the edge of the auricle originates, as well as a length offset (offset vector) related to this specific point in direction and length.
  • the direction of the offset vector is less relevant here than the determination of a point in the immediate vicinity (e.g radius of 1-2 mm) of the base of the ear, where the edge of the auricle originates, as well as a length offset (offset vector) related to this specific point in direction and length.
  • Length offset can be specified in advance, for example as the direction of a horizontal tangent to the head through the ear root point.
  • the terms “comprises,” “includes,” “includes,” “has,” “has,” “having,” or any other variant thereof, as appropriate, are intended to cover non-exclusive inclusion.
  • a method or apparatus that includes or has a list of elements is not necessarily limited to those elements, but may include other elements that are not expressly listed or that are inherent in such method or apparatus.
  • a condition A or B is satisfied by one of the following conditions: A is true (or present) and B is false (or absent), A is false (or absent) and B is true (or present), and both A and B are true (or present).
  • the term "configured” or “set up” used here, if applicable, to fulfill a specific function (and respective modifications thereof) is to be understood within the meaning of the invention that the corresponding entity, in particular device or computer program, is already available in a configuration or setting, in which it can perform the function or it is at least adjustable - ie configurable - so that it can perform the function after appropriate adjustment.
  • the configuration can take place, for example, via a corresponding setting of parameters of a process flow or of switches or the like for activating or deactivating functionalities or settings.
  • the device can have several predetermined configurations or modes of operation have, so that the configuration can be done by selecting one of these configurations or operating modes.
  • the initial geometry of the spectacle frame is adapted to the model of the head, preferably in three-dimensional virtual space, on the one hand on the basis of a model of the head of the person represented by the head model data and on the other hand a model of a specific spectacle frame represented by the spectacle frame data performed.
  • an optimized "fit" of the modeled frame on the head model can be achieved.
  • the adapted model of the spectacle frame represented by the modified spectacle frame data in turn also defines the geometry of a real spectacle frame that can be produced.
  • a frame can be produced, in particular by means of additive manufacturing, on the basis of the modified spectacle frame data.
  • the fit of the spectacle frame optimized in virtual space can thus be transferred to the real world by manufacturing a real spectacle frame based on the adapted model of the spectacle frame, so that a real spectacle frame resulting from this also has a correspondingly optimized fit with regard to the real head of the person.
  • the geometry of the spectacle frame is already optimized from the start, i.e. already as a direct result of the automated process flow for determining the modified spectacle frame data, with regard to the seat of the spectacle frame on or on the head.
  • the initial geometry of the spectacle frame is adjusted using an optimization method in which the geometry of the spectacle frame is modified by changing, in particular varying, the value of at least one Parameters of the parameter set as part of an optimization process, an adjustment criterion is optimized.
  • the adjustment criterion can in particular contain a combination or aggregation of several individual criteria. In particular, it can concern the quality of the (virtual) fit or hold of the eyeglass frame on the person's head according to the head model, in particular the ear hooks.
  • adapting the initial geometry of the eyeglass frame to the model of the head includes: (i) determining the parameter value(s) for a first subset of the parameters of the parameter set, which define a geometry of a front part of the eyeglass frame in the model of the eyeglass frame; and (ii) subsequent determination of the respective value(s) for a second subset of the parameters of the parameter set, disjoint from the first subset, while retaining the previously determined parameter values of the parameter(s) of the first subset, the parameters of the second subset in the model of the spectacle frame define a respective geometry of at least one ear piece of the spectacle frame.
  • the parameter values for the parameters of the first subset are first defined, and thus for the front part of the spectacle frame.
  • This typically also has the actual mounts for one or more, usually two, spectacle lenses.
  • the parameter values for the parameters of the second subset are only defined after all steps have already been carried out correctly except for the adaptation of the geometry, such as the ear piece length and the ear piece bend, of at least one ear piece of the spectacle frame. This sequence is based on the knowledge that, as a rule, there are interactions between the geometry of the front part on the one hand and the geometry of the ear hooks on the other.
  • the aforementioned sequential procedure has the advantage that negative effects of such interactions between the parameter values on the one hand of the first subset and on the other hand of the second subset on the optimization of the geometry of the spectacle frame as a whole can be rendered harmless, at least in the sense that an optimized definition of the earpiece geometry by means of the parameter values for the parameters of the second subset can no longer be subsequently affected by - here now excluded - adjustments of one or more parameter values for parameters of the first subset.
  • the parameterization of the model of the spectacle frame is or will be selected in such a way that the parameterization for at least one ear piece in the model of the spectacle frame results in a total length of the ear piece or a respective length of at least one of a location of the ear piece inflection point according to the model of the spectacle frame in the earhook provided in the earhook is defined from the extending earhook section of the earhook.
  • a first earpiece portion may be defined to extend from the location of the earpiece inflection point toward the proximal earpiece end of the earpiece as viewed from the front portion.
  • the proximal end of the earpiece can be or can be provided in particular to connect to the front part of the spectacle frame, in particular to a projection of the front part that extends in the direction of the earpiece.
  • the front part and the ear piece are connected to one another by a pivoting device, such as a hinge, so that the ear piece can be folded in or out with respect to the front part at this point.
  • a second ear piece portion may also be defined to extend from the location of the ear piece break point toward the distal ear piece end of the ear piece as viewed from the front portion of the model of the eyeglass frame.
  • the geometry of the earpiece can thus be defined in the model of the spectacle frame or its geometric data, in particular using the two earpiece sections and the earpiece inflection point between them.
  • the second ear piece portion extends from the location of the ear piece break point to the distal end of the ear piece.
  • the length of the second earhook section defined by the respective parameter value of at least one parameter, in particular the second subset, is also determined as a function of: (i) at least one dimension of the ear corresponding to the earhook with regard to the side of the head, obtained from the model of the head the person or the location of the ear on the head, or (ii) metadata associated with the person representing at least one physical characteristic of the person regularly correlated with a dimension of their ears. Such a characteristic can be, in particular, the gender of the person, their age or their ethnicity. In this way, an optimized length of the second ear clip section can be concluded.
  • the length of its earpiece section between the location of the earpiece inflection point and the distal end of the earpiece is determined by at least one of the specified values of the parameters, in particular of the second subset, for at least one earpiece of the model of the spectacle frame in such a way that this length is in the value interval [40mm; 50mm], preferably in the value range [43 mm; 47 mm], especially in the value interval [44 mm; 46 mm] lies.
  • the first earhook section extends between the location of the earhook bend and the proximal earhook end of the earhook and the second earhook section between the location of the earhook bend and the distal earhook end of the earhook.
  • the overall length of the earpiece or the change in length compared to the initial length can be used directly as a parameter and can be determined on the basis of an individual optimization of the respective lengths of the two earpiece sections as part of the adjustment.
  • at least one of the parameters, in particular the second subset is set for at least one ear piece of the model of the eyeglass frame in such a way that it defines the location of an ear piece bend along the course of the corresponding ear piece. In this way, the location of the ear piece bend in the model of the spectacle frame can be represented directly by such a parameter and thus be easily accessible without this location having to be derived from the values of other parameters first in order to be taken from the model.
  • the location of the ear root point or the length offset is determined depending on: (i) at least one dimension obtained from the model of the head with respect to the head side to the ear temple corresponding ear of the person, or (ii) metadata associated with the person representing at least one physical characteristic of the person regularly correlated with a dimension of their ears.
  • the length offset is defined such that its length is in the value interval [11 mm; 14mm], preferably in the value interval [12mm; 13mm], lies. It has been found in many series of tests with different people that a length offset selected from one of these value intervals typically leads to an optimized position of the location of the ear hook bend, in which a very good fit of the ear hook on the head can be achieved.
  • the respective parameter value for at least one of the parameters, in particular the second subset, which defines a property for at least one ear hook of the model is determined using a local coordinate system whose origin is located at the location of the ear hook bend on the ear hook.
  • This can advantageously be used to easily define further parameters, in particular the second subset, which relate to the spatial progression of the ear piece, in particular to the ear piece bend.
  • At least one of the parameters, in particular the second subset can be selected such that it uses its parameter value to define a bend angle or a radius of curvature of the ear piece, in each case at the location of the ear piece bend, as a property.
  • at least two of the parameters, in particular the second subset are or will be selected in such a way that these parameters, based on their parameter values in two mutually angled, in particular orthogonal, standing planes, each have a kink angle or a radius of curvature of the earpiece, each at the location of the ear piece bend, is defined as a property.
  • the planes can be selected in particular so that a first plane is vertical and parallel to the plane of symmetry of the head in relation to a normal position of the head (head crown up, eyes at the same height) and a second plane is orthogonal to it and also vertical.
  • a first plane is vertical and parallel to the plane of symmetry of the head in relation to a normal position of the head (head crown up, eyes at the same height) and a second plane is orthogonal to it and also vertical.
  • the second plane can then again be perpendicular to it and also vertical.
  • the bend angle or radius of curvature of the earpiece in the first plane can be from “top” to "bottom”, and in the second plane the bend angle or radius of curvature of the earpiece defined from the outside in (i.e. towards the inside of the head).
  • the use of these two bending or curvature directions allows a particularly good adjustment of the spectacle frame, i.e. above all the ear piece, to the head and thus a particularly good fit of the spectacle frame.
  • acquiring or generating head model data comprises: (i) segmenting the model of the head into two or more head surface segments, wherein at least each person's ear represented by the model of the head defines an associated segment of the segmentation such that the respective ear is represented by its associated segment; (ii) determining reference points on or on the model of the head, a plurality of different reference points on or on the ear being defined for each of the segments respectively assigned to an ear; and (iii) at least partially measuring the model of the head using at least two of the reference points as position markers, the distance between which is determined.
  • this allows only to optimize the earpiece or earpieces relevant to provide parts of the model of the head with reference points and to use them for measurement).
  • At least one of the reference points is determined as a function of one or more image textures assigned in each case to a surface section on the surface of the head in the model of the head.
  • the accuracy of the position of the reference points relative to the head model can be regularly optimized on the basis of this additional texture information, for example in such a way that the ear root point or other points on the edge of the auricle represent specific reference points with high accuracy, which in turn leads to a particularly precise definition of the parameters of the second subset and thus the ear clip geometry can be used.
  • the parameters, in particular the second subset, of the parameter set are or will be defined as part of the method in such a way that, overall, they reflect the respective shape of two different ear hooks, one for each ear of the head of the person or the model of the head Define the model of the glasses frame. It is thus possible, in particular, to adapt the two ear hooks individually to the respective geometry of the head on its opposite sides, in particular the ears. This is advantageous above all against the background that most people have a non-negligible asymmetry with regard to the geometry of the two sides of the head and, in particular, also of the ears.
  • the method also includes outputting manufacturing data determined as a function of the modified spectacle frame data for additive manufacturing of a real spectacle frame corresponding to the adapted model of the spectacle frame or a real spectacle frame kit for such a real spectacle frame.
  • the production data can in particular be used as control data for controlling a device for additive manufacturing, for example by means of a process. additive selective laser sintering, be or will be configured from real objects.
  • the outputting of the manufacturing data can in particular include directly controlling such a device for additive manufacturing, or outputting or transmitting to a data memory for later use within the scope of such Production.
  • the actual manufacture of the real spectacle frame can already take place or be prepared, in particular configured, on the basis of the adapted model of the spectacle frame.
  • additive manufacturing within the meaning of the invention is understood to mean manufacturing methods in which the material is added pointwise, linewise or in layers to produce a component.
  • this includes powder bed-based additive manufacturing processes such as 3D powder printing and selective laser sintering (SLS), as well as suspension-based additive manufacturing processes such as lithography-based ceramic manufacturing (LCM), laminated object manufacturing (LOM), thermoplastic 3D printing (T3DP), fused filament fabrication (FFF) to the group of additive manufacturing processes.
  • SLS powder bed-based additive manufacturing processes
  • LOM lithography-based ceramic manufacturing
  • LOM laminated object manufacturing
  • T3DP thermoplastic 3D printing
  • FFF fused filament fabrication
  • “Production data” for additive manufacturing is to be understood in particular as data that at least partially defines the geometry of a component to be manufactured using additive manufacturing, directly or indirectly (e.g. through control data for controlling a device for additive manufacturing), so that the Additive manufacturing of the component resulting geometry of the component, at least essentially, is fixed.
  • the production data can in particular already be given by the modified spectacle frame data itself or else be derived as a function thereof, in particular with regard to production optimization or a specific type of additive manufacturing or a specific type of manufacturing device.
  • a second aspect of the invention relates to a spectacle frame or a spectacle frame kit, obtainable by at least partial additive manufacturing of the spectacle frame or the spectacle frame kit as a function of modified spectacle frame data generated by the method according to one of the preceding claims, with this geometry of the spectacle frame to be produced by additive manufacturing or at least partially define at least one ear piece element of the spectacle frame kit.
  • a “spectacle frame kit” within the meaning of the invention is to be understood here as a group of two or more individual components which are configured in the sense of a kit to be assembled into a finished spectacle frame by the components being connected to one another accordingly.
  • the connecting means such as hinges or pins serving as part thereof or attachable to the ear hooks Sleeves (e.g. made of rubber) or mechanisms for the detachable attachment of interchangeable ear hooks can, but do not have to be part of the kit themselves, especially since they are often not produced by additive manufacturing and can also often be made of a different material than the front part and/or the ear pieces of the glasses frame.
  • the kit can consist of a front part and two earpieces of the spectacle frame, one for each ear, with all of these components being additively manufactured.
  • At least one of the earpieces of the spectacle frame or of the spectacle frame kit is produced by means of an additive manufacturing process and, as a result of its additive manufacturing, has an earpiece bend in at least one plane.
  • At least one of the earpieces of the eyeglass frame or eyeglass frame assembly is made of metal-free material, such as polyamide or another polymeric material, using an additive manufacturing process.
  • Spectacle frame kit these initially have and maintain the desired shape leading to an optimized fit, so that expensive and/or heavy metal materials, which are often used in conventional spectacle frames for the purpose of specifically adapting the shape to the person's head and then maintaining it, are used Shape, in particular despite potential exposure to heat, used, can be omitted.
  • the eyeglass frame or eyeglass frame kit has two earpieces that differ in at least one of the following parameters as a direct result of additive manufacturing: overall length of the earpiece, location of an earpiece crease along the course of the earpiece, kink angle or radius of curvature of the earpiece at the location the ear piece bend; Angle of the ear piece, ie the angle between the front part of the glasses frame and the respective ear piece.
  • a third aspect of the invention relates to a computer program or computer-readable storage medium, having instructions which, when executed on a computer or a distributed computer system, cause the latter to execute the method according to the first aspect of the invention.
  • the computer program can be stored in particular on a storage medium such as a non-volatile data carrier.
  • a storage medium such as a non-volatile data carrier.
  • This is preferably a data carrier in the form of an optical data carrier or a flash memory module.
  • the computer program can be present as a file on a data processing unit, in particular on a server, and can be downloaded via a data connection, for example the Internet or a dedicated data connection, such as a proprietary or local network.
  • the computer program can have a plurality of interacting individual program modules.
  • the modules can be configured or at least used in such a way that they are executed in the sense of distributed computing on different devices (computers or processor units that are geographically spaced apart and connected to one another via a data network.
  • the computer or the computer system can correspondingly have at least one program memory in which the computer program is stored.
  • the computer or the computer system can also be set up to access a computer program that is available in particular externally, for example on one or more servers or other data processing units (which can themselves be part of the distributed computer system) via a communication connection, in particular in order to exchange data with it, which are used during the course of the process or computer program or represent outputs of the computer program.
  • 1A is a flow chart illustrating an example
  • FIG. 1B is a flowchart showing the adjustment step of the method of FIG. 1A in more detail, according to a preferred embodiment
  • FIG. 2 shows schematically a head model of a person and a segment around an ear of the model using a captured image texture thereto;
  • FIG. 3 shows a schematic side view of an exemplary virtual spectacle frame according to a spectacle frame model with a predefined starting geometry before its subsequent individualization, as well as several detailed views of an ear piece or a portion thereof in the spectacle frame model at different resolutions of the model;
  • Fig. 4A schematically in a side view, (i) in a first reading a virtual spectacle frame according to a spectacle frame model, which is worn by a head model (virtually) or (ii) in a second reading a real spectacle frame worn by a real head of a person is carried;
  • FIG. 4b schematically shows an enlarged section of a side view on the one hand and a top view on the other hand from FIG. 4A, in which further details for determining parameters for defining the ear piece bend are drawn.
  • FIGS. 1A and 1B in order to explain an exemplary embodiment 100 of a method according to the invention.
  • FIGS. 2 to 4B in order to explain an exemplary embodiment 100 of a method according to the invention.
  • the method 100 can in particular be a partially or fully computer-implemented method which can be executed entirely or partially on a processor platform, for example a computer. It has a step 110 in which a model (“head model”) of the real head of a person, for which a geometry of a spectacle frame specifically customized for this person is to be determined, is generated and made available using biometric head model data.
  • the head model can also be recorded in the form of head model data that has already been generated beforehand, for example read in or received via a data or communication interface.
  • the head model can be generated in particular on the basis of sensor data which are generated by means of a 3D scan of the person's real head and in particular also allow or provide at least a partial biometric measurement of the head.
  • Methods for carrying out such a 3D scan can be based in particular on scanning the head using light or infrared rays. For example, such methods are known in connection with person recognition in smartphones, in particular for unlocking the same or for authorizing transactions carried out using such devices, such as product or software license purchases.
  • the head model data representing the head model can represent the head as a polygon model or spline model and thereby define the nodes (vertices) or edges of the surface elements spanned thereby.
  • a few selected ones of these nodes or additional selected points that are calculated on the basis of such nodes or edges, for example by interpolation or extrapolation, can - as illustrated in Fig. 2(a) - be defined as reference points x i (with index i).
  • the spectacle frame model can then be adapted to the head model without having to use or process all of the information from the head model and thus its full complexity. This can be used to achieve higher process efficiency.
  • FIG. 2(b) shows a segment thereof centered around an ear E of the head model, the individual points on the surface of the head obtained by scanning being visible here, on the basis of which the polygon model in particular can be defined.
  • Fig. 2 (c) an image texture of the head determined photographically when capturing the head model 200 is additionally shown (in the sense of an overlay with the image from Fig. 2 (b)) for the same segment, as it is individually (without overlaying with the image from Fig. 2(b) is shown in Fig. 2(d) Fig.
  • 2(c) thus particularly illustrates a mapping between the 2D photographic image texture to the 3D polygon mesh of the polygon model, whereby the image texture and thus also reference points, which are obtained on the basis of the 2D photo, can be trivially projected onto the surface of the 3D polygon model.
  • a more accurate model of the head can be determined, here for the corresponding segment around the ear.
  • this also allows reference points x to be recognized or established on the ear E with good accuracy, which reference points x represent distinctive or particularly marked points on the ear E according to the head model 200 and for the following Individualization of a spectacle frame model can be used for the person. Biometric dimensions, such as distances Ax between two such reference points x and x j can also be determined in this way.
  • the head model 200 can be used to determine and measure the individual geometry of the person's ears as a basis for the subsequent individualization of the geometry of the spectacle frame.
  • the model of the spectacle frame can be defined as a polygon model. Examples of this will be explained below with reference to FIG. 3 .
  • the parameters can represent the position of certain points or lines (e.g. so-called guidelines) on the geometry of the spectacle frame or certain dimensions, in particular such guidelines or the connecting sections between certain points.
  • such parameters can use their values to determine the position of points that are particularly important for the fit or the aesthetics of the spectacle frame, for example the so-called root of the nose, where the spectacles ideally sit centrally on the nose, or of guidelines that define the geometric course of the upper frame edge set above the lens openings of the glasses frame, define variably depending on the parameter value.
  • the initial spectacle frame data provided in step 120 represents an initial geometry 300 of a specific type of spectacle frame that is to be individualized with respect to the person or the head model provided for them in step 110 in the sense of an optimized geometry adaptation.
  • An exemplary initial geometry 300 of such a spectacle frame is shown in Fig. 3 illustrated.
  • the spectacle frame has a front part 310, in which there are also the openings for accommodating spectacle lenses, and two earpieces 315 (of which only the "left” is shown here and is described below. For the other ("right") earpiece however, the same applies mutatis mutandis).
  • the ear clip 315 In relation to the front part 310, the ear clip 315 has a proximal end at which it is attached to the front part 310 so that it can be folded, typically by means of a hinge 330.
  • the earpiece 315 can also already have a predetermined initial temple bend at a location Bo along the course of the temple, in particular with a predetermined initial temple bend angle f 0 in the image plane of Fig. 3(a) and possibly a further initial temple bend angle 0 0 in a direction perpendicular to this Image plane standing level (directed in particular towards the head) have.
  • the bend in the earpiece defines a first earpiece section 320 of the initial length ao and a second earpiece section 325 of the initial length bo along the course of the earpiece 315 .
  • specific reference points can also be defined on the spectacle frame model 300, in particular those which correspond to a specific reference point on the head model.
  • a reference point can be defined on the nose bridge connecting the two lens frame areas on the spectacle model.
  • the model of the spectacle frame can be defined in particular as a polygon model and in different resolutions.
  • the initial geometry 300 of the spectacle frame as illustrated in FIG. 3 (b)
  • could initially be generated or provided in a relatively coarse resolution which is refined after or as part of the adaptation of the geometry, as illustrated in FIG. 3 (c).
  • the resolution can be adapted again, in particular refined, as illustrated in Fig. 3 (d), in order to produce a real spectacle frame with as much to get a smooth surface.
  • the methods follow a further step 130 in which the initial model 300 of the eyeglass frame is already matched to the model 200 of the head is adjusted.
  • the front part 310 is correspondingly adapted with regard to its geometry, while the geometry of the ear hooks 315 initially remains unchanged or is not considered at all.
  • the adjustment 130 can be carried out in particular on the basis of the reference points defined for the head model 200 and the corresponding reference points on the spectacle frame model 300, in particular in such a way that by adapting the geometry of the front part 310 in the spectacle frame model, certain mutually corresponding reference points of both models are congruent or in one other predetermined spatial relationship are brought to each other.
  • This adaptation is represented in the spectacle frame model by the values of parameters of a first subset Mi of the parameter set M, which are provided for defining the geometry of the front part of the spectacle frame model, being redefined or changed in accordance with the adaptation.
  • parameters can define the position of guidelines on the front part, the position and height of the nose bridge, the size of the lens frames, an inclination of the attachments for the earpieces, etc.
  • a further step follows 140, in which the parameters of a second subset M2 of the parameter set, which is disjunctive to the first subset, are correspondingly adapted in order to adapt the geometry of the ear hooks 315, in particular individually, to the head model 200.
  • a possible iteration within the framework of the method 100 can be provided in particular in the form of a loop, including steps 130 and 140 or even being restricted to them.
  • Metadata MD which in particular can be part of the head model
  • metadata can in particular contain information about the person, which typically correlates with the head geometry, in particular with certain dimensions on it. For example, such information can relate to the gender, age or height, or the regional origin or ethnicity of the person.
  • Step 140 will be explained in more detail below with reference to FIG. 1B.
  • a step 150 can optionally be provided subsequently, in which the modified geometry data resulting from the adjustment in steps 130 and 140, which, based on the current values of the parameters of the parameter set M, represent the geometry of the spectacle frame model modified by the adjustments, are transformed, in particular for Optimization of the resolution of the spectacle frame model (see Fig.
  • Such a transformation can also be used to provide manufacturing data corresponding to the modified geometry, in particular for additive manufacturing of a real spectacle frame that corresponds to the adapted spectacle frame model.
  • z. B. an at least approximate real-time capability, a lower, i.e. coarser, resolution with an associated lower number of discrete elements of the same to be processed as part of the adjustment of the polygon model can be selected than for the later production data, with the transformation from step 150 regarding this adjustment the resolution accomplished.
  • the resulting modified eyeglass frame data can then be provided in a step 160, for example as a file or data stream.
  • the modified spectacle frame data thus represent the modified geometry of the spectacle frame model thus adapted to the head model 200 obtained through the adjustments.
  • the modified spectacle frame data can be used in particular, immediately or after their transformation into special production data (see above) as a basis for, in particular, additive manufacturing (e.g. 3D printing) of a model-based real spectacle frame or elements of a spectacle frame assembly kit for it (e.g. still without the spectacle hinges ) to serve.
  • the modified spectacle frame data or production data can in particular already be control data for a device for the additive manufacturing of objects (e.g. 3D printer).
  • the cut 130 can also be omitted, so that it is assumed that the geometry of the front part 310 remains the same and only the ear hooks 315 are adjusted.
  • FIG. 1B and to FIGS. 4A and 4B the adjustment step 140 of the method 100 will now be explained in greater detail, it being noted that FIG. 1B only represents one possible exemplary embodiment for step 140, and other implementations are also possible , which can differ in particular with regard to the type, number and order of the sub-steps and the parameters determined overall.
  • a respective ear root point A on the head model 200 is determined on the basis of the head model data for each of the two ears of the head model 200, from which the arcuate pinna edge of the ear E originates on the head.
  • This is illustrated by way of example in FIG. 4A for a "left" earhook 415, where the ear E is folded forward by a finger F for the sake of better clarity. In the following, only this one ear hook is discussed, but the same procedure can be used correspondingly for the second ear hook.
  • the ear root point A can be obtained using both the three-dimensional geometry of the head recorded from a 3D head scan and using image texture.
  • a point can be identified in an area at the front of the ear where the course of the upper edge of the auricle begins.
  • the image texture in particular can be evaluated to the effect that the ear root point A must lie in an area of the ear that is not covered by hair.
  • the course of the line C is also drawn in by means of a dashed line, from which the auricle originates in its upper area on the head.
  • This is particularly important insofar as a correctly fitted ear piece 415 of an adapted or modified spectacle frame model 400 must run behind this line with its second section 425 originating at location B of the ear piece bend—seen from the front part 410 of the spectacle frame 400.
  • a length offset in particular in the form of an offset sector V, is determined either from the head model data (in particular from one or more dimensions of the ear E determined therefrom) or on the basis of a predefined value.
  • the predefined value could be set to 12 mm, which corresponds to a value that various test series have shown to provide a value for the length offset that leads to good fitting results for a number of head geometries.
  • the further geometry of the ear piece can be determined in sub-steps 144 and 145 by defining appropriate
  • Parameters of the second subset M2 of the parameter set M are determined. These parameters can include, in particular, the length a of the first bracket section 420, which runs between its proximal end 430, which starts at the location of a hinge on the front part 410, and the location B of the ear bracket bend.
  • the length b of the second earpiece section 425, which runs between the location B of the earpiece bend and the distal end of the earpiece 415, can also be determined as a parameter.
  • the length a of the first temple section 420 can consequently also be dependent in particular on the geometry of the front part 410 of the spectacle frame, which is predefined by means of the parameters of the first subset Mi of the parameter set.
  • the length b of the second bracket section 425 can in particular be set either to a previously defined value or to a value derived from the head geometry, in particular from one or more dimensions, of the ear E of the head model 200 .
  • the previously defined value mentioned is preferably in the value interval [30 mm; 50 mm], especially in the value interval [43 mm;47 mm]. Good adjustment results can thus be achieved regularly for many head geometries.
  • the size of the bending angle f, by which the two ear hook sections 420 and 425 are tilted relative to one another in a first plane (y-z plane in Fig. 4A, 4B), and/or an associated radius of curvature R for the course of the ear piece, in particular its lower edge, in the area of the ear piece bend can be determined as further parameters of the subset M2.
  • the radius of curvature can be understood in particular as the radius of a circle 440 , the circumference of which follows the course of the ear piece 415 in the vicinity of location B of the ear piece bend.
  • the magnitude of another kink angle Q in a second plane perpendicular to the first plane (x-y plane in Figs. 4A, 4B) that defines how much the second earpiece section is canted toward or away from the head can also be determined .
  • the further sub-step 148 illustrated in FIG. 1B serves to actually adjust the values of the parameters of the subset M2 such that M2 represent the previously determined values for the definition of the geometry of the ear temples of the modified eyeglass frame model 400 .
  • the values for one or more, in particular all, of the aforementioned parameters B, a, b, L, d, f, Q and R can be defined. It is of course also possible, in particular, instead of this summarizing adjustment sub-step 148, to carry out the corresponding adjustment of the named parameters directly in connection with the determination of the respective parameter values for them.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Ophthalmology & Optometry (AREA)
  • Optics & Photonics (AREA)
  • Eyeglasses (AREA)

Abstract

L'invention concerne un procédé de génération de données géométriques représentant la géométrie d'une monture de lunettes qui est individualisée pour une personne particulière, ledit procédé consistant à : acquérir ou générer des données de modèle de tête biométriques qui représentent un modèle multidimensionnel virtuel de la tête de la personne pour au moins une région partielle de la tête qui comprend les deux oreilles de la personne ; acquérir ou générer des données de monture de lunettes qui définissent une géométrie initiale d'une monture de lunettes particulière sur la base de valeurs de paramètres particulières d'une géométrie géométrique, en particulier un modèle de monture de lunettes virtuel paramétré par un ensemble de paramètres ayant une pluralité de paramètres ; adapter automatiquement la géométrie initiale de la monture de lunettes au modèle de la tête, des données de monture de lunettes modifiées qui représentent une géométrie de monture de lunettes adaptée au modèle de la tête étant générées par modification correspondante d'au moins une valeur de paramètre de l'ensemble de paramètres ; et fournir les données de monture de lunettes modifiées en tant que données géométriques d'une monture de lunettes qui est individualisée pour la personne. Le processus d'adaptation consiste à : déterminer au moins une valeur de paramètre de l'ensemble de paramètres en fonction d'un emplacement, sur la tête, d'un point de base d'oreille de l'oreille associée à un écouteur de monture de lunettes, ledit emplacement étant déterminé à partir des données de modèle de tête, et en fonction d'un décalage de longueur défini qui est relatif au point de base d'oreille, en conséquence de quoi l'emplacement d'un coude d'écouteur le long de la trajectoire de l'écouteur est déterminé pour l'écouteur dans le modèle de monture de lunettes.
PCT/EP2022/058289 2021-04-14 2022-03-29 Monture de lunettes individualisée et procédé de génération de données géométriques de celle-ci WO2022218693A1 (fr)

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EP22719532.8A EP4323833A1 (fr) 2021-04-14 2022-03-29 Monture de lunettes individualisée et procédé de génération de données géométriques de celle-ci

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DE102021109381.3 2021-04-14
DE102021109381.3A DE102021109381A1 (de) 2021-04-14 2021-04-14 Individualisierte brillenfassung und verfahren zum erzeugen von deren geometriedaten

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DE102022213745A1 (de) 2022-12-16 2024-06-27 Rodenstock Gmbh Additive Herstellung wenigstens einer Komponente einer individualisierten Brille

Citations (3)

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US20160327815A1 (en) * 2014-01-02 2016-11-10 Essilor International (Compagnie Générale d'Optique) Method for determining a geometric definition of a customized optical device
WO2016195488A1 (fr) * 2015-05-29 2016-12-08 Maydo B.V. Procédé de fabrication d'une monture de lunettes adaptée à un porteur de lunettes
EP3657236A1 (fr) * 2017-06-01 2020-05-27 Carl Zeiss Vision International GmbH Procédé, dispositif et programme informatique destinés à l'adaptation virtuelle d'une monture de lunettes

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Publication number Priority date Publication date Assignee Title
DE102018009811A1 (de) 2018-12-13 2020-06-18 YOU MAWO GmbH Verfahren zum Generieren von Herstellungsdaten zur Herstellung einer Brille für eine Person
DE102019101351B4 (de) 2019-01-18 2021-01-07 Dyemansion Gmbh Vorrichtung und Verfahren zur Oberflächenglättung von additiv hergestellten Formteilen aus Kunststoff

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160327815A1 (en) * 2014-01-02 2016-11-10 Essilor International (Compagnie Générale d'Optique) Method for determining a geometric definition of a customized optical device
WO2016195488A1 (fr) * 2015-05-29 2016-12-08 Maydo B.V. Procédé de fabrication d'une monture de lunettes adaptée à un porteur de lunettes
EP3657236A1 (fr) * 2017-06-01 2020-05-27 Carl Zeiss Vision International GmbH Procédé, dispositif et programme informatique destinés à l'adaptation virtuelle d'une monture de lunettes

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