EP2410372B1 - Berechnungsverfahren eines Sollwerts zum Facetten- oder Rillenschleifen einer Sehlinse - Google Patents

Berechnungsverfahren eines Sollwerts zum Facetten- oder Rillenschleifen einer Sehlinse Download PDF

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Publication number
EP2410372B1
EP2410372B1 EP11290306A EP11290306A EP2410372B1 EP 2410372 B1 EP2410372 B1 EP 2410372B1 EP 11290306 A EP11290306 A EP 11290306A EP 11290306 A EP11290306 A EP 11290306A EP 2410372 B1 EP2410372 B1 EP 2410372B1
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EP
European Patent Office
Prior art keywords
point
ophthalmic lens
longitudinal profile
points
initial longitudinal
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EP11290306A
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English (en)
French (fr)
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EP2410372A1 (de
Inventor
Jérémie Biton
David Freson
Eric Belloni
Thierry Allouis
Benoit Holvoet Vermaut
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EssilorLuxottica SA
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Essilor International Compagnie Generale dOptique SA
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Priority to PL11290306T priority Critical patent/PL2410372T3/pl
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
    • B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
    • B24B9/148—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms electrically, e.g. numerically, controlled

Definitions

  • the present invention relates generally to the field of eyewear.
  • It relates more specifically to the calculation of the position that must present the groove or the nesting rib on the edge of the ophthalmic lens to be machined, for mounting in an entourage of a rimmed or semi-circled spectacle frame.
  • the technical part of the optician's profession is to mount a pair of corrective ophthalmic lenses on a spectacle frame selected by a wearer.
  • the acquisition operation is notably known from the document EP2031435 .
  • the surround (or "circle") is designed to surround the entire periphery of the lens.
  • the trimming then comprises a beveling operation which consists of producing along the edge of the lens an interlocking rib intended to fit into a groove, commonly known as a bezel, traversing the inner face of the circle of the eyeglass frame.
  • the entourage has an arcade which follows an upper part of the periphery of the lens and a thread which runs along the lower part of the periphery of the lens in order to hold the lens against the arch.
  • the trimming then comprises a creasing operation which consists of producing along the edge of the lens a nesting groove of which an upper part accommodates a rib provided along the inner face of the arcade and a lower part can accommodate the wire.
  • the optician mills this lens in such a way that the rib or the interlocking groove follows the front optical face of the lens, extending at a constant distance from this front optical face.
  • the pair of glasses once assembled, is not aesthetic because of the positioning of the lenses in the frames of the frame imposed by the aforementioned constraints.
  • the edge of the lens is particularly thick, it overflows unsightly to the back of the entourage.
  • the present invention proposes a method for calculating the position of the rib or the interlocking groove on the edge of the lens, which allows greater flexibility in the choice of this position to prevent any interference or lack of aesthetics of the assembly.
  • This method then makes it possible, if necessary, to modify the coordinates of these two remarkable points so as to distance the longitudinal profile from the position which was initially assigned to it (at mid-thickness of the edge of the lens or along the front face of the this lens), so as to prevent these problems of aesthetics or assembly.
  • the choice of the first remarkable point is made according to a referral criterion and a positioning criterion.
  • the combination of these two criteria is intended to determine, on the one hand, what is the maximum risk that the optician would incur if he deviated the lens along the initial longitudinal profile (aesthetic problem, mounting, ... ), and, on the other hand, at what point of the initial longitudinal profile this risk would be maximum (nasal side of the frame, temporal side, ).
  • the choice of the second remarkable point is made according to another positioning criterion in order to determine, from among a list of points selected as a function of the position of the first remarkable point, that where a problem (other or identical to the first) risks to to ask.
  • the correction, in an axial direction substantially perpendicular to an average plane of the lens, of a modified axial coordinate of each remarkable point, is carried out according to an axial positioning rule which depends on the results of steps b) to d ).
  • This axial positioning rule is indeed chosen according to the problem to be solved.
  • the eyeglass frame 10 considered here comprises two circles connected to each other by a trigger guard and which each carry a branch.
  • Each circle of the frame also has a groove, commonly called “bezel”, which runs along the entire periphery of each circle and which is open towards the center of this circle.
  • FIG 1 schematically shows the various devices that allow the optician to prepare a job of two ophthalmic lenses 20, for mounting on a spectacle frame 10 previously selected by the future carrier of the pair of glasses.
  • the first operation S.1 implemented by the optician is to determine the visual acuity and needs (unifocal or progressive lenses, transparent or colored ...) of the future carrier, and to communicate this information to a lens manufacturer .
  • the optician equips the future wearer of his spectacle frame (which is then generally equipped with presentation lenses) to raise the position of the pupil of the future wearer relative to the frame.
  • the raised point is called the pupillary point.
  • the ophthalmic lenses 20 are then molded and machined by the manufacturer to present the desired optical powers. They are then sent to the optician who is then responsible for cutting their contours to the shape of the circles of the selected eyeglass frame.
  • the optician has a device for reading contours 100, a center-blocker device 200, and a trimming apparatus 300. These devices are here all three controlled by the same control unit 400. Alternatively, they could of course be controlled by separate driving units.
  • the contour reading device 100 allows the optician, during a second operation S.2, to record the geometry of a longitudinal profile (or "strand") running along the periphery of the bezel of each circle. of the selected eyeglass frame.
  • the centering-and-holding device 200 makes it possible, during a third operation S.3, to respectively center these two longitudinal profiles on the two ophthalmic lenses 20 (see FIG. figure 3 ), such that once cut in this longitudinal profile and mounted on the frame, each lens is correctly positioned relative to the eyes of the wearer.
  • the trimming apparatus 300 makes it possible, during a fourth and last operation S.4, to cut the two ophthalmic lenses 20 following these two longitudinal profiles.
  • This apparatus comprises an upper cover 101 covering the entire apparatus with the exception of a central upper portion in which is disposed the spectacle frame 10 selected.
  • It comprises a set of two jaws 102, at least one of the jaws 102 is movable relative to each other so that the jaws 102 can be moved towards or away from each other to form a clamping device.
  • Each of the jaws 102 is further provided with two formed tongs each of two studs 103 movable to be adapted to clamp the spectacle frame 10 between them in order to immobilize it.
  • a frame 107 is visible in the space left visible by the upper central opening of the cover 101.
  • a plate 104 can move in translation on the frame 107 along a transfer axis A3.
  • a turntable 105 is rotatably mounted on this plate 104.
  • This turntable 105 is thus able to take two positions on the transfer axis A3 in favor of the translation of the plate 104 on the frame 107, including a first position in which the center of the turntable 105 is disposed between the two pairs of studs 103 fixing the right circle of the spectacle frame 10, and a second position in which the center of the turntable 105 is disposed between the two pairs of studs 103 fixing the left circle of the spectacle frame 10.
  • the turntable 105 has an axis of rotation A4 defined as the axis normal to the front face of the turntable 105 and passing through its center. It is adapted to pivot about this axis relative to the plate.
  • the turntable 105 furthermore comprises an oblong aperture 106 in the form of an arc of a circle through which a probe 110 protrudes.
  • This probe 110 comprises a support rod 111 having an axis perpendicular to the plane of the front face of the turntable 105 and at its free end, a feeler pin 112 of axis perpendicular to the axis of the support rod 111. This feeler finger 112 is intended to follow by sliding or possibly rolling the bottom edge of the bezel of each circle 11 of the spectacle frame 10.
  • the shape reading apparatus 100 comprises actuating means (not visible in the figure) adapted, firstly, to slide the support rod 111 along the lumen 106 in order to modify its radial position relative to to the axis of rotation A4 of the turntable 105, a second part, to vary the angular position of the turntable 105 about its axis of rotation A4, and, thirdly, to position the probe finger 112 of the probe 110 at an altitude more or less important compared to the plane of the front face of the turntable 105.
  • the probe 110 is provided with three degrees of freedom, including a first degree of freedom R constituted by the ability of the probe 110 to move radially with respect to the axis of rotation A4 thanks to its freedom of movement along the arc formed by the light 106, a second degree of freedom THETA constituted by the ability of the probe 110 to pivot around the rotation axis A4 through the rotation of the turntable 105 relative to the plate, and a third degree of freedom Z constituted by the ability of the probe 110 to translate along an axis parallel to the axis of rotation A4 of the turntable 105.
  • a first degree of freedom R constituted by the ability of the probe 110 to move radially with respect to the axis of rotation A4 thanks to its freedom of movement along the arc formed by the light 106
  • THETA constituted by the ability of the probe 110 to pivot around the rotation axis A4 through the rotation of the turntable 105 relative to the plate
  • a third degree of freedom Z constituted by the ability of the probe 110 to translate along an axis
  • Each point read by the end of the probe finger 112 of the probe 110 is located in a corresponding coordinate system R, THETA, Z.
  • the method of acquiring a longitudinal profile of the bezel using this contour reading apparatus 100 is as follows.
  • the spectacle frame 10 is inserted between the studs 103 of the jaws 102 of the reading apparatus 100, so that each of its circles 11 is ready to be palpated along a path starting with the insertion of the feeler 110 between the two studs 103 which enclose the lower part of the corresponding circle of the frame, then following the bezel of this circle, to cover all the periphery of this bezel.
  • control unit 400 defines as zero the angular position THETA j and the altitude Z j of the end of the probe finger 112 of the probe 110 .
  • the actuating means then rotate the turntable 105. During this pivoting, the actuating means impose a constant radial force on the probe 110 in the direction of the bezel, so that the feeler finger 112 of the probe 110 slides along from the bottom edge of the bezel without going up along the front and rear flanks of this bezel.
  • the control unit 400 detects the spatial coordinates R 1j , THETA 1j , Z 1j of a plurality of points of the bottom edge of the bezel, here 360 points angularly separated by one degree around the axis of rotation A4. These 360 points thus characterize the shape of the bottom ridge of the bezel of the circle considered.
  • the centering and blocking apparatus 200 shown in the figure 1 is designed to, firstly, identify the positions of the centering marks of each ophthalmic lens 20 to prepare, and, secondly, block this ophthalmic lens 20 by depositing a locking accessory on its front face.
  • This center-and-blocker device 200 is well known to those skilled in the art and does not make the object of the invention described. Its architecture and operation are for example described in detail in the patent document EP 1 722 924 .
  • This apparatus comprises in particular means 201 for acquiring an image of the lens, and means for analyzing this image making it possible to determine the position of the optical reference system of the ophthalmic lens 20.
  • These probing means generally comprise two probing arms whose free ends are turned towards each other to feel the front and rear faces of the lens. lens.
  • locking means 202 which comprise an automated locking arm adapted to take with a clamp a locking accessory and to deposit it at a predetermined location on the front face of the ophthalmic lens 20, chosen in function of the acquired position of the optical reference of this lens.
  • the locking accessory then forms a reference representative of the optical reference position of the ophthalmic lens. Destined to be engaged in a corresponding housing of the trimming apparatus 300, it then allows the trimming apparatus 300 to know the position of the optical reference of the ophthalmic lens.
  • the trimming apparatus 300 is also well known to those skilled in the art and is not the object of the invention described. It can be made in the form of any cutting or removal machine capable of modifying the contour of the ophthalmic lens 20 to adapt to the shape of the selected frame.
  • FIG 3 there is shown an ophthalmic lens 20 viewed from the front as it is when it is sent by the lens manufacturer to the optician.
  • this ophthalmic lens 20 has two optical faces, including a front face 22 convex and a rear face 21 concave, and a wafer 23 initially circular.
  • This ophthalmic lens 20 carries on its front face 22 provisional centering marks 24-27, applied on the lens by the manufacturer to locate the positions of the characteristic points of this lens.
  • provisional centering marks which are generally in the form of micro-engravings. Provisional centering marks, however, allow a more convenient identification of the lens prior to mounting on a spectacle frame, while permanent centering marks are generally intended to identify the nature and characteristics of the ophthalmic lens after erasing the marks. provisional centering.
  • the optical axis A6 of the ophthalmic lens 20 is then defined as that which passes through the center of the target 24 and which is normal to the front face 22 of the lens at the center of this target 24.
  • the reference system of the ophthalmic lens 20 is indicated by an orthonormal coordinate system (X 1 , Y 1 , Z 1 ) defined as one having an origin coincident with the center of the target 24, a first axis X 1 parallel to the horizon lines 27, a second axis Y 1 directed towards the top of the lens, and a third axis Z 1 parallel to the optical axis A6 and directed towards the front of the ophthalmic lens 20.
  • an orthonormal coordinate system (X 1 , Y 1 , Z 1 ) defined as one having an origin coincident with the center of the target 24, a first axis X 1 parallel to the horizon lines 27, a second axis Y 1 directed towards the top of the lens, and a third axis Z 1 parallel to the optical axis A6 and directed towards the front of the ophthalmic lens 20.
  • This initial contour 29 is generally defined by the three-dimensional coordinates of a plurality of points P i sufficient to characterize its shape.
  • the three-dimensional coordinates of these points P i are expressed in an orthonormal frame (X 2 , Y 2 , Z 2 ) linked to the selected spectacle frame, the first axis X 2 of which is defined by the horizon of the spectacle frame 10 , whose second axis Y 2 is directed towards the top of the frame, and whose third axis Z 2 is normal to the mean plane of the spectacle frame (typically the plane normal to the axis A4 when the frame is fixed in the contour reading apparatus 100) and is directed towards the front of the frame.
  • boxing frame B1 of the initial contour 29 This boxing frame is usually defined as being the rectangle which is circumscribed to the projected initial contour 29 in the plane (X 2 ; Y 2 ), two of whose sides are parallel to the 27.
  • the center of this boxing framework is called the boxing center E1.
  • the four points of intersection between the initial contour 29 and the boxing frame B1 are respectively named nasal point Pn, temporal point Pt, high point Ph and low point Pb.
  • an ophthalmic lens 20 is shown in axial section, ie in section along a plane containing the optical axis A6 as it is when it has been machined along the initial contour 29.
  • This ophthalmic lens 20 then has on its edge an engagement rib 28 (or “bevel”) arranged to fit into the interlocking groove (or “bezel”) formed in recess in the corresponding circle of the spectacle frame 10.
  • the ophthalmic lens 20 has a variable thickness.
  • the variations in the thickness of the lens along the initial contour 29 then form a function denoted Ep (P i ).
  • This figure also defines the position of the engagement rib 28 with respect to the front face 22 of the ophthalmic lens 20 by means of a distance denoted by Dav.
  • the variations of this distance along the initial contour 29 then form a function denoted Dav (P i ).
  • This distribution ratio makes it possible to characterize the distribution between the part of the slice 23 of the lens which is situated at the front of the interlocking rib 28 and the part of the slice 23 of the lens which is situated at the rear. of this interlocking rib 28.
  • the method for calculating the three-dimensional geometry of the final contour 39 '(or "final longitudinal profile") in which the ophthalmic lens 20 is to be beveled is broken down into five main operations. These operations are here implemented by the control unit 400 when the ophthalmic lens 20 is positioned in the centering and locking device 200.
  • control unit 400 acquires the three-dimensional geometry of an initial contour 29, illustrating the shape that should ideally present the top of the nesting rib 28 of the ophthalmic lens 20 to fit snugly into the bezel of the corresponding circle of the selected eyeglass frame.
  • This initial contour 29 therefore does not take into account the difference in curvature between the circle and the lens, so that the lens can not generally be cut off along this contour.
  • the initial contour 29 has a geometry deduced from that of the corresponding circle of the eyeglass frame. This shape is however slightly different from that of the circle, to take into account the phenomenon according to which once the ophthalmic lens 20 has been fitted into this circle, the top of its interlocking rib 28 does not come into contact with the bottom of the bezel but remains at a distance from the latter.
  • the acquisition operation OP.1 then consists of a calculation, from the three-dimensional coordinates R 1i , THETA 1i , Z 1i of the 360 points characterizing the geometry of the bottom edge of the bezel, of the three-dimensional coordinates R i , THETA i , Z i of 360 points P i characterizing the geometry of this initial contour 29.
  • the three-dimensional coordinates R i , THETA i , Z i of 360 points P i characterizing the shape of the initial contour 29 are thus expressed in a reference linked to the contour reading apparatus, centered in particular on the axis of rotation A4 of this device. They are then corrected to be expressed in the reference (E1, X 2 , Y 2 , Z 2 ) linked to the spectacle frame.
  • control unit 400 pre-positions the initial contour 29 on the ophthalmic lens 20, in the frame (X 1 ; Y 1 ; Z 1 ).
  • This prepositioning is broken down into three stages, including two preliminary steps and one adjustment step.
  • the first preliminary step is a centering step. It consists in putting the reference (X 2 , Y 2 , Z 2 ) of the circle of the frame in coincidence with the reference (X 1 , Y 1 , Z 1 ) of the ophthalmic lens, so that their axes are superimposed and that the optical centering point of the ophthalmic lens 20 merges with the pupil point marked with respect to the initial contour 29.
  • the second preliminary step is an orientation step of pivoting the two marks relative to each other about the Z axis 1 and the pupillary point, at an angle which is a function of the instructions of the wearer.
  • the adjustment step consists in modifying, if necessary, the geometry of the initial contour, so as to take account of the differences in curvature between the circle of the eyeglass frame and the ophthalmic lens 20.
  • This step can be done in different ways. It may for example consist of deforming the initial contour so that it extends halfway down the lens.
  • the probing means provided on the centering-and-holding device 200 are for this purpose controlled to detect the three-dimensional coordinates R 2i , THETA 2i , Z 2i of the 360 points of the front face 22 of the lens located respectively at the 360 points P i .
  • the control unit 400 also usually takes advantage of the probing of the three-dimensional coordinates R 2i , THETA 2i , Z 2i of the 360 points of the front face 22 of the ophthalmic lens 20, to also feel the corresponding 360 points of the rear face 21 of the ophthalmic lens 20. This probing allows him to deduce the thickness Ep (P i ) of the lens at each of the 360 points P i .
  • the invention then consists in verifying whether, in view of the aesthetic and mounting parameters of the ophthalmic lens 20 in the corresponding circle of the eyeglass frame, the initial contour 29 is correctly positioned on the lens, and then, if such is not the case, to deform or reposition the initial contour 29 to deduce the position and shape of the final contour 29 '.
  • switching criteria and positioning criteria are used for this purpose to identify the two remarkable points of the initial contour 29 at which the risk of occurrence of an aesthetic problem or mounting is greatest.
  • a positioning rule then makes it possible, in the event of proven risk, to modify the coordinates of these remarkable points in order to then be able to modify the position (and possibly the shape) of the entire initial contour 29 in order to overcome these problems.
  • the search operation OP.3 of the two remarkable points Pr1, Pr2 is then implemented by the control unit 400 using different parameters.
  • the threshold rate Re max is a predetermined constant, which corresponds to the distribution ratio Re beyond which it is considered that the nesting rib 28 is located too close to the front face 22 of the lens, which makes appear too much of the edge of the lens at the back of the rim of the frame, unsightly manner.
  • This threshold rate Re max may for example be chosen equal to 20%.
  • the determined rate Re det corresponds to the distribution ratio that it is desired to use to correct the position of the initial contour 29 on the edge of the ophthalmic lens 20 when, at the remarkable point considered, the distribution ratio Re is strictly greater than the threshold rate Re max .
  • This determined rate Re det can for example be chosen equal to the threshold rate Re max .
  • the collision threshold S coll corresponds to the maximum thickness, expressed in millimeters, to be provided between the point Pn (at which the nasal plate is considered to cling to the circle of the frame) and the rear face 21 of the lens. ophthalmic 20, to prevent the nose plate of the spectacle frame from conflicting with the peripheral edge of the rear face of the lens.
  • This collision threshold S coll can be either predetermined (considering a representative sample of spectacle frames) and chosen equal to one millimeter, or determined by the optician according to the shape of the selected spectacle frame.
  • the thickness threshold S E p corresponds to the limit thickness, expressed in millimeters, below which it is considered that it is not possible to modify the position of the interlocking rib 28 on the edge 23 of the Ophthalmic lens 20.
  • this thickness threshold S E p may be chosen equal to the width of the interlocking rib 28, that is to say to the width of the groove of the beveling wheel of the 300. Indeed, below this width, it is understood that the interlocking rib must necessarily be centered on the edge of the lens so that at least a central portion of the interlocking rib 28 appears on the slice of the lens.
  • this threshold of thickness S Ep can also be predetermined and not be a function of the clipping device available to the optician. It can then for example be chosen equal to 2 millimeters.
  • control unit 400 thus proceeds to search for the two remarkable points Pr1, Pr2 of the initial contour 29 using these various parameters.
  • step 501 the control unit 400 determines whether the thickness function Ep (P i ) satisfies a first switching criterion.
  • This switching criterion consists in determining whether the minimum thickness of the lens ophthalmic along the initial contour 29 is or not less than the thickness threshold S Ep .
  • control unit 400 compares each of 360 thickness values Ep (P i ) calculated with the thickness threshold S Ep .
  • step 502 the control unit 400 then determines, among the 360 points of the initial contour 29, the one at which the thickness function Ep (P i ) satisfies a first positioning criterion.
  • This first positioning criterion consists in determining the point of the initial contour 29 where the thickness of the ophthalmic lens 20 is minimum. This point then corresponds to the first remarkable point Pr1.
  • step 503 the control unit 400 then modifies the third coordinate Z i of this remarkable point Pr1 so as to locate it at mid-thickness of the edge 23 of the lens, that is to say at equal distance front 22 and rear 21 of the ophthalmic lens 20.
  • step 504 the control unit 400 searches, among the four cardinal points, the nearest point of the first remarkable point Pr1.
  • the second remarkable point will be chosen from the high points Ph and low point Pb.
  • the first remarkable point will be located at most near the high point Ph or the low point Pb, the second remarkable point will be chosen from the nasal point Pn and the temporal point Pt.
  • control unit 400 has detected that the point closest to the first remarkable point Pr1 is the nasal point Pn or the temporal point Pt, it then establishes a list of two points to choose the second remarkable point Pr2, which includes the high point Ph and the low point Pb.
  • the control unit 400 determines, in this list of two points, the point at which the distribution ratio function Re (P i ) satisfies a second positioning criterion.
  • This second positioning criterion is more precisely to determine the point at which the distribution ratio Re is maximum, to determine the point where the risk of aesthetic defect is highest. This criterion thus makes it possible to predict the point at which the risk that the edge 23 of the lens disproportionately exceeds the rear of the circle is the highest.
  • step 506 the control unit 400 verifies that this distribution ratio Re (Ph) is greater than the threshold rate Re max .
  • step 507 consists in selecting the high point as the second remarkable point Pr2 and in modifying the third coordinate Z i of this remarkable point Pr2 so as to position the nesting rib at an aesthetic distance from the front face 22 of the ophthalmic lens.
  • the following step 508 consists in selecting the low point Pb as second remarkable point Pr2 and keep the third coordinate Z i of this remarkable point Pr2 unchanged.
  • control unit 400 finds that the distribution ratio Re (P i ) is maximum at the low point Pb.
  • step 509 the control unit 400 verifies that this distribution ratio Re (Pb) is greater than the threshold rate Re max .
  • step 511 consists in selecting the low point as the second remarkable point Pr2 and in modifying the third coordinate Z i of this remarkable point Pr2 so as to position the nesting rib at an aesthetic distance from the front face 22 of the ophthalmic lens.
  • the next step 510 consists of selecting the high point Ph as the second remarkable point Pr2 and keeping the third coordinate Z i of this point outstanding Pr2 unchanged.
  • control unit 400 detects that the point closest to the first remarkable point Pr1 is the low point Pb or the high point Ph, it then establishes a list two points to choose the second remarkable point Pr2, which includes the nasal point Pn and the temporal point Pt.
  • step 512 before selecting the second remarkable point Pr2, the control unit 400 checks whether there is a risk of interference between the nose plate of the frame of the frame and the peripheral edge of the rear face 21 of the ophthalmic lens 20.
  • the control unit 400 assigns to the distribution ratio Re (Pn) the value of the collision rate Re coll . Otherwise, the value of the distribution ratio Re (Pn) remains unchanged.
  • step 513 the control unit 400 then determines, in the list of two points, the point at which the distribution ratio function Re (P i ) satisfies a second positioning criterion.
  • This second positioning criterion also consists in determining the point at which the distribution ratio Re is maximum.
  • step 514 the control unit 400 verifies that this distribution ratio Re (Pn) is greater than the threshold rate Re max .
  • step 515 consists in selecting the temporal point as the second remarkable point Pr2 and in modifying the third coordinate Z i of this remarkable point Pr2 so as to position the nesting rib at an aesthetic distance from the front face 22 of the ophthalmic lens.
  • the next step 516 consists of selecting the nasal point Pn as the second remarkable point Pr2 and keeping the third coordinate Z i of this point outstanding Pr2 unchanged.
  • control unit finds that the distribution ratio Re (P i ) is maximum at the time point Pt.
  • step 517 the control unit 400 verifies that this distribution ratio Re (Pt) is greater than the threshold rate Re max .
  • step 518 consists in selecting the nasal point Pn as the second remarkable point Pr2 and in modifying the third coordinate Z i of this remarkable point Pr2 so as to positioning the nesting rib at an aesthetic distance from the front face 22 of the lens.
  • the following step 519 consists in selecting the point nasal Pn as second remarkable point Pr2 and to modify the third coordinate Z i of this remarkable point Pr2 so as to position the nesting rib at an aesthetic distance from the front face of the lens.
  • the following step 520 consists in selecting the temporal point. Pt as the second remarkable point Pr2 and to keep the third coordinate Z i of this remarkable point Pr2 unchanged.
  • step 530 the control unit 400 determines whether the function Dar (P i ) satisfies a second switching criterion.
  • This switching criterion consists here in determining whether there is a risk of interference between the nasal plate of the spectacle frame and the peripheral edge of the rear face 21 of the ophthalmic lens 20.
  • control unit compares the value of this function with the nasal point Dar (Pn) with the collision threshold S coll .
  • step 531 the control unit 400 then determines, among the four cardinal points, the one at which the repair rate Re (P i ) satisfies a first positioning criterion.
  • This first positioning criterion consists in determining the cardinal point at which the distribution ratio Re (P i ) is maximum. This point corresponds to the first remarkable point Pr1.
  • control unit 400 checks, during a step 532, 533, 534, 535, if this distribution ratio Re (Pr1) is greater than the threshold rate Re max .
  • step 538, 539, 540, 541 consists in modifying the third coordinate Z i of this remarkable point Pr1 so as to position the rib 28 of the ophthalmic lens 20.
  • the control unit 400 then establishes a list of two points to choose the second remarkable point Pr2 which comprises the high point Ph and the low point. Pb.
  • step 542 the control unit 400 then determines, in this list of points, the point at which the distribution ratio Re satisfies a second positioning criterion.
  • This second positioning criterion consists more precisely in determining, among the high points Ph and low Pb, the one at which the distribution ratio Re is maximum.
  • the control unit 400 considers that the low point Pb constitutes the second remarkable point Pr2.
  • control unit 400 checks whether the previously calculated maximum distribution ratio is greater than the threshold rate Re max .
  • step 545 the control unit stops the algorithm.
  • step 546, 547 the control unit 400 continues the algorithm and retains the third coordinate Z i of the second remarkable point Pr2 unchanged.
  • the control unit 400 then establishes a list of two points to choose the second remarkable point Pr2 which comprises the nasal point Pn and the point temporal Pt.
  • step 548 the control unit 400 then determines, in this list of points, the point at which the distribution ratio Re satisfies a second positioning criterion.
  • This second positioning criterion consists more precisely of determining, among the nasal points Pn and temporal points Pt, that at which the distribution ratio Re is maximum.
  • the control unit 400 considers that the temporal point Pt constitutes the second remarkable point Pr2.
  • the control unit 400 considers that the nasal point Pn constitutes the second remarkable point Pr2.
  • control unit 400 checks whether the previously calculated maximum distribution ratio is greater than the threshold rate Re max .
  • step 551 the control unit stops the algorithm.
  • step 552, 553 the control unit 400 continues the algorithm and keeps the third coordinate Z i of the second remarkable point Pr2 unchanged.
  • control unit 400 observes, at the end of step 530, that there is a risk of collision between the nose plate of the frame of the frame and the peripheral edge of the rear face 21 of the ophthalmic lens 20.
  • step 560 the control unit 400 assigns the value of the collision rate Re coll to the distribution rate at the nasal point Re (Pn).
  • step 561 the control unit 400 determines, from the list of points constituted by the nasal point Pn and the temporal point Pt, that at which the distribution ratio Re (P i ) satisfies a first positioning criterion.
  • This positioning criterion consists here in determining the point at which the distribution ratio Re (P i ) is maximum.
  • step 562 the control unit 400 checks whether this distribution ratio Re (Pr1) is greater than the threshold rate Re max .
  • step 564 consists of modifying the third coordinate Z i of this first remarkable point Pr1 so as to avoid any problem of mounting the ophthalmic lens. 20 in his circle.
  • the following step 565 consists in modifying even more sensitively the third coordinate Z i of this first remarkable point Pr1 so as to avoid any problem aesthetic.
  • step 561 the control unit 400 observes that the distribution ratio Re (P i ) is maximum at the time point Pt.
  • step 563 the control unit 400 checks whether this distribution ratio Re (Pt) is greater than the threshold rate Re max .
  • the nasal point Pn is then considered to be the first remarkable point Pr1, and the algorithm is switched to the aforementioned step 564.
  • the next step 566 then consists in modifying the third coordinate Z i of this first remarkable point Pr 1 so as to avoid any aesthetic problem. This modification is supposed to interact sufficiently on the position of the nasal point Pn to avoid any problem of collision between the nose pad and the ophthalmic lens.
  • the control unit 400 calculates the geometry of the final contour 29 '.
  • This final contour 29 ' is defined as resulting from a geometrical transformation of the initial contour 29 which is such that this final contour 29' passes through the two remarkable points Pr1, Pr2.
  • This transformation could of course be done differently. In particular, it could affect not only the third coordinates Z i of the points P i of the initial contour 29, but all of their three coordinates. In this variant, it will typically be possible not to modify the shape of the initial contour 29, but to modify only its position by tilting it so that it passes through the two remarkable points Pr1, Pr2.
  • control unit 400 controls the trimming of the ophthalmic lens 20 with the aid of the trimming apparatus 300.
  • This clipping operation is here carried out in two stages of roughing and finishing.
  • a cylindrical grinding wheel is used to roughly reduce the rays of the lens as a function of the geometry of the final contour 29 '.
  • the ophthalmic lens 20 is extracted from the trimming apparatus 300 and is then fitted into the corresponding circle of the spectacle frame 10.
  • the invention is also applicable to the preparation of ophthalmic lenses for mounting in semi-rimmed spectacle frames.
  • the process of calculating the final contour is then carried out in five operations.
  • the control unit acquires the two-dimensional geometry of the initial contour, for example from a photo of the presentation lens equipping the frame of semi-rimmed spectacles.
  • the picture For this purpose, it is processed to determine the coordinates R i , THETA i of 360 points of the contour of this presentation lens.
  • control unit pre-positions this initial contour on the ophthalmic lens, in three steps of centering, orientation and adjustment identical to those previously described.
  • control unit searches for the two remarkable points of this initial contour, and deduces the geometry of the final contour in the reference of the ophthalmic lens (that is to say, the shape and position of this final contour on the ophthalmic lens).
  • the control unit controls the trimming of the ophthalmic lens in two stages of roughing and finishing.
  • a milling cutter provided on the finisher 303 of the trimming apparatus 300, to achieve a nesting groove along its periphery.
  • the ophthalmic lens is extracted from the shaping device, and is fitted on the rib provided on the inner face of the corresponding arcade of the spectacle frame. It is then held in position using a nylon thread engaged in its interlocking groove and connected to the ends of the arch.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Eyeglasses (AREA)

Claims (15)

  1. Berechnungsverfahren für die Geometrie eines Längsprofils einer an der Kante (23) eines Brillenglases (20) einzuarbeitenden Einsetzrippe bzw. -rille (28), das folgende Schritte umfasst:
    - einen Schritt zur Erfassung der Geometrie eines ursprünglichen Längsprofils (29)
    - einen Schritt zur Vorpositionierung des ursprünglichen Längsprofils (29) in einem Bezugssystem, das sich auf das Brillenglas (20) bezieht
    - einen Schritt zum Ermitteln von zwei unterschiedlichen spezifischen Punkten (Pr1, Pr2) des ursprünglichen Längsprofils (29), bei dem man:
    a) eine Vielzahl von Merkmalen (Ep, Dav, Dar) in Bezug zum Brillenglas (20) und/oder zum ursprünglichen Längsprofil (29) erfasst,
    b) prüft, ob eins der erfassten Merkmale ein Verteilungskriterium erfüllt, wobei der Wert dieses erfassten Merkmals mit einem vorbestimmten Grenzwert verglichen wird,
    c) den ersten spezifischen Punkt (Pr1) aus einer ersten Punkteliste des ursprünglichen Längsprofils (29) als Wert auswählt, dem gegenüber eins der erfassten Merkmale ein erstes Positionierungskriterium erfüllt, das in Abhängigkeit des Ergebnisses von Schritt b) ausgewählt wird,
    d) den zweiten spezifischen Punkt (Pr2) aus einer zweiten Punkteliste des ursprünglichen Längsprofils (29) als Wert auswählt, dem gegenüber eins der erfassten Merkmale ein zweites Positionierungskriterium erfüllt, wobei diese zweite Liste vom Ergebnis des Schrittes c) abgeleitet wird,
    - einen Schritt der Korrektur der Position jedes spezifischen Punkts (Pr1, Pr2) gemäß einer axialen Richtung (Z1), die zu einer mittleren Ebene des Brillenglases (20) im Wesentlichen senkrecht steht, und
    - einen Schritt zur Berechnung der dreidimensionalen Geometrie eines endgültigen Längsprofils (29') in einem Bezugssystem des Brillenglases (20), das aus einer geometrischen Verformung des ursprünglichen Längsprofils (29) hervorgeht und derart ist, dass das endgültige Längsprofil (29') durch die wie im Zuge des vorausgehenden Schrittes veränderten ersten und zweiten spezifischen Punkte (Pr1, Pr2) verläuft.
  2. Berechnungsverfahren nach vorausgehendem Anspruch, bei dem jedes Positionierungskriterium darin besteht, unter den Punkten der ersten oder zweiten Punkteliste den Punkt auszuwählen, an dem der Wert des erfassten Merkmals maximal bzw. minimal ist.
  3. Berechnungsverfahren nach einem der vorausgehenden Ansprüche, bei dem sich jedes in Schritt a) erfasste Merkmal auf die Geometrie des Brillenglases (20) oder auf die axiale Position des ursprünglichen Längsprofils (29) in Bezug auf eine der optischen Seiten (21, 22) des Brillenglases (20) bezieht.
  4. Berechnungsverfahren nach einem der vorausgehenden Ansprüche, bei dem sich im Schritt b) das Verteilungskriterium in mindestens einem Punkt des ursprünglichen Längsprofils (29) auf die Stärke (Ep) des Brillenglases (20) bezieht.
  5. Berechnungsverfahren nach vorausgehendem Anspruch, bei dem das Verteilungskriterium darin besteht, zu überprüfen, ob die Mindeststärke (Ep) des Brillenglases (20) entlang dem ursprünglichen Längsprofil (29) unter einem Grenzwert für die Stärke (SEp) liegt.
  6. Berechnungsverfahren nach Anspruch 4, bei dem das Verteilungskriterium darin besteht, zu überprüfen, ob der axiale Abstand (Dar) zwischen der Rückseite (21) des Brillenglases (20) und dem ursprünglichen Längsprofil (29) in mindestens einem Punkt in einem Nasenbereich dieses ursprünglichen Längsprofils (29) unter einem Grenzwert für Interferenzen (Scoll) liegt.
  7. Berechnungsverfahren nach einem der vorausgehenden Ansprüche, bei dem im Schritt b) vorgesehen ist, wenn das Verteilungskriterium nicht erfüllt wird, zu überprüfen, ob eins der in Schritt a) erfassten Merkmale ein anderes Verteilungskriterium erfüllt, und bei dem im Schritt c) das erste Positionierungskriterium ebenfalls in Abhängigkeit des mit diesem anderen Verteilungskriterium erhaltenen Ergebnisses ausgewählt wird.
  8. Berechnungsverfahren nach einem der vorausgehenden Ansprüche, bei dem sich im Schritt c) das erste Positionierungskriterium auf die Mindeststärke (Ep) des Brillenglases (20) entlang dem ursprünglichen Längsprofil (29) bezieht und der erste spezifische Punkt (Pr1) dem Punkt des ursprünglichen Längsprofils (29) entspricht, an dem die Stärke des Brillenglases (20) minimal ist.
  9. Berechnungsverfahren nach einem der vorausgehenden Ansprüche, bei dem sich im Schritt c) das erste Positionierungskriterium auf das Verhältnis (Re) zwischen dem axialen Abstand (Dar) zwischen dem ursprünglichen Längsprofil (29) einer der optischen Seiten (21, 22) des Brillenglases (20) und der Stärke (Ep) des Brillenglases (20) bezieht.
  10. Berechnungsverfahren nach vorausgehendem Anspruch, bei dem die optische Seite die Rückseite (21) des Brillenglases (20) ist und der erste spezifische Punkt (Pr1) dem entspricht, der in der ersten Liste das maximale Verhältnis (Re) aufweist.
  11. Berechnungsverfahren nach einem der Ansprüche 9 und 10, bei dem die erste Punkteliste genau vier Punkte (Ph, Pb, Pn, Pt) umfasst, die auf der Kurvenabszisse jeweils weniger als 10 Millimeter von den vier Schnittpunkten des ursprünglichen Längsprofils (29) mit den zwei Symmetrieachsen des Boxing-Rahmens (B1) dieses ursprünglichen Längsprofils (29) entfernt sind.
  12. Verfahren nach einem der Ansprüche 9 bis 11, bei dem die erste Punkteliste genau vier Punkte (Ph, Pb, Pn, Pt) umfasst, die sich jeweils am Schnittpunkt des ursprünglichen Längsprofils (29) und des Boxing-Rahmens (B1) dieses ursprünglichen Längsprofils (29) befinden.
  13. Berechnungsverfahren nach einem der vorausgehenden Ansprüche, bei dem die zweite Punkteliste zwei Punkte (Ph, Pb, Pn, Pt) umfasst, die auf der Kurvenabszisse weniger als 10 Millimeter von den zwei Schnittpunkten des ursprünglichen Längsprofils (29) mit einer der zwei Symmetrieachsen des Boxing-Rahmens (B1) dieses ursprünglichen Längsprofils (29) entfernt sind, wobei es sich bei dieser Symmetrieachse um die handelt, die am weitesten vom ersten spezifischen Punkt (Pr1) entfernt ist.
  14. Berechnungsverfahren nach einem der vorausgehenden Ansprüche, bei dem sich das zweite Positionierungskriterium auf das Verhältnis (Re) zwischen dem axialen Abstand (Dar) zwischen dem ursprünglichen Längsprofil (29) einer der optischen Seiten (21) des Brillenglases (20) und der Stärke (Ep) des Brillenglases (20) bezieht.
  15. Berechnungsverfahren nach einem der vorausgehenden Ansprüche, bei dem im Schritt d) der zweite spezifische Punkt (Pr2) so ausgewählt wird, dass er sich auf der Kurvenabszisse mindestens um 30 Millimeter ab dem ersten spezifischen Punkt (Pr1) erstreckt.
EP11290306A 2010-07-20 2011-07-01 Berechnungsverfahren eines Sollwerts zum Facetten- oder Rillenschleifen einer Sehlinse Active EP2410372B1 (de)

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US20190293959A1 (en) * 2018-03-21 2019-09-26 Essilor International Method and a machine for preparing an ophthalmic lens to be edged

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FR2979558B1 (fr) * 2011-09-01 2013-10-04 Essilor Int Procede de surfacage d'une surface d'un verre de lunettes
FR2983316B1 (fr) * 2011-11-30 2014-06-27 Essilor Int Procede de preparation d'une lentille ophtalmique
JP5972759B2 (ja) * 2012-11-06 2016-08-17 Hoya株式会社 レンズ加工システム、加工サイズ管理装置、加工サイズ管理方法および眼鏡レンズの製造方法
JP6127530B2 (ja) * 2013-01-17 2017-05-17 株式会社ニデック 眼鏡レンズ加工装置および加工制御データ作成プログラム
FR3013620B1 (fr) * 2013-11-26 2015-12-25 Essilor Int Procede de biseautage d'une lentille ophtalmique
FR3039661B1 (fr) * 2015-07-31 2017-09-01 Essilor Int Dispositif et procede d'acquisition d'une zone remarquable d'une monture et procede de determination d'au moins un parametre de detourage d'une lentille ophtalmique
JP6766400B2 (ja) * 2016-03-28 2020-10-14 株式会社ニデック 眼鏡レンズ加工装置、及び眼鏡レンズ加工プログラム
JP6103788B1 (ja) * 2016-04-15 2017-03-29 波田野　義行 眼鏡レンズ加工データ作成方法
JP6124322B1 (ja) * 2016-04-15 2017-05-10 波田野　義行 眼鏡レンズ加工データ作成方法

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FR2735858B1 (fr) 1995-06-23 1997-09-12 Essilor Int Calibre etalon pour l'etalonnage d'un appareil de lecture de contour pour monture de lunettes, et procede d'etalonnage correspondant
JP4121696B2 (ja) * 2000-10-17 2008-07-23 株式会社トプコン 眼鏡レンズの面取加工データ作成方法、眼鏡レンズの面取加工方法、眼鏡レンズの面取加工データ作成装置及び眼鏡レンズの面取加工装置
FR2866718B1 (fr) 2004-02-24 2006-05-05 Essilor Int Dispositif centreur-bloqueur d'une lentille ophtalmique de lunettes, methode de detection automatique et methodes de centrage manuel associees
JP4726791B2 (ja) * 2004-06-29 2011-07-20 Ｈｏｙａ株式会社 眼鏡レンズの製造方法
JP4774203B2 (ja) * 2004-10-01 2011-09-14 株式会社ニデック 眼鏡レンズ加工装置
EP2031435B1 (de) * 2007-12-28 2019-02-27 Essilor International Verfahren zur bestimmung eines konturendatensatzes einer brillenfassung

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Publication number Priority date Publication date Assignee Title
US20190293959A1 (en) * 2018-03-21 2019-09-26 Essilor International Method and a machine for preparing an ophthalmic lens to be edged

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ES2403488T3 (es) 2013-05-20
US20120133886A1 (en) 2012-05-31
FR2963116B1 (fr) 2012-08-10
US8523353B2 (en) 2013-09-03
EP2410372A1 (de) 2012-01-25
PL2410372T3 (pl) 2013-06-28

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