EP1996368A1 - Methode de pilotage de palpeur pour lecture de drageoir de monture de lunettes et appareil de lecture correspondant - Google Patents
Methode de pilotage de palpeur pour lecture de drageoir de monture de lunettes et appareil de lecture correspondantInfo
- Publication number
- EP1996368A1 EP1996368A1 EP07731098A EP07731098A EP1996368A1 EP 1996368 A1 EP1996368 A1 EP 1996368A1 EP 07731098 A EP07731098 A EP 07731098A EP 07731098 A EP07731098 A EP 07731098A EP 1996368 A1 EP1996368 A1 EP 1996368A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- probe
- speed
- axis
- component
- reading
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000523 sample Substances 0.000 title claims abstract description 165
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005096 rolling process Methods 0.000 claims abstract description 4
- 239000011521 glass Substances 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 3
- 230000006870 function Effects 0.000 description 12
- 238000005259 measurement Methods 0.000 description 7
- 238000005452 bending Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 230000002123 temporal effect Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 210000000887 face Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 210000001747 pupil Anatomy 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Classifications
-
- 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
- B24B9/144—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 the spectacles being used as a template
Definitions
- the present invention relates generally to the field of eyewear and more specifically the probing of the bezel of a frame rimmed glasses.
- It relates more particularly to a method of reading the outline of the bezel of a spectacle frame circle comprising a step of contacting a probe against the bezel and a step of probing the bezel by sliding or rolling said probe along the bezel, the position of the probe being determined and the probe speed comprising first, second and third components.
- It also relates to a device for reading the outline of the bezel of a spectacle frame circle which comprises means for holding the frame, a feeler, means for determining the position of the feeler and means for controlling a first component of the speed of the probe, and which is adapted to implement the steps of the contour reading method.
- the method finds a particularly advantageous application by its application to glasses with elongated or strongly arched frames.
- the technical part of the optician's profession is to mount a pair of ophthalmic lenses on a frame selected by a wearer. This assembly is broken down into five main operations: - the reading of the outline of the bevels of the circles of the frame selected by the wearer, that is to say the contour of the grooves that run through the inside of each frame of the frame,
- each lens which consists in determining the position that each lens will occupy on the frame so as to be properly centered facing the pupil of the wearer's eye so that it properly exerts the optical function for which it was designed
- each lens which consists in determining the coordinates of points on each of the faces of the lens characterizing the geometry of the contour of the lenses, then, - Trimming of each lens which consists in machining or cutting its contour to the desired shape , considering the defined centering parameters, with, at the end of the machining, the beveling which consists in producing on the edge of the lens a bevel to hold the lens in the bezel that includes the mount.
- the objective of this operation is in particular to follow exactly the bottom of the bezel that includes the circle to read so as to memorize a precise digital image of the geometry of the bezel.
- Document US Pat. No. 6,871,158 discloses a bezel tracking device intended to overcome the problems of inaccuracies in the reading of the bevels due to the deformation of the frames during the passage of the probe.
- This device comprises in particular means for identifying the type of frame to be read and means for controlling the speed of rotation of the probe for sliding along the complete contour of the bezel.
- this device is adapted to determine the type of the frame to be read, then, depending on whether this type of frame is characteristic or not of a frame that can encounter problems of deformation, to control the probe in rotation at a speed depending on the type of frame, constant on the whole bezel.
- this device can provide for splitting the outline of the bezel into different predetermined zones in which the speed of rotation of the feeler is constant but between which it varies.
- the disadvantage of such a device is that to substantially improve the reading accuracy of the bezel, it is necessary to very strongly reduce the speed of rotation of the feeler along the entire bezel, which greatly increases and detrimental way the reading time of the outline of the bezel, is necessary to split the outline of the bezel in different zones, in which case the applicant has noticed that there remain errors of reading.
- the splitting operation is further manually performed by the operator on a suitable interface, which requires experience and takes time.
- the present invention proposes a method of reading fast contour and providing accurate results.
- a contour reading method as defined in the introduction, wherein the first component of the speed of the probe is dynamically controlled to vary, continuously or in steps, during reading according at least one or the other of the second and third components of the probe speed.
- the probe generally has the shape of an elongate rod along a probing axis and is conventionally driven in rotation about an axis of rotation for sliding along the complete contour of the bezel.
- the probing axis of the probe can not be constantly presented orthogonally to the tangent to the outline of the bezel. Therefore, the longer the frame is elongated, the more the probe is presented inclined with respect to the bezel in certain areas of the frame, particularly near the nasal and temporal areas of the frame. When the frame is strongly arched, this inclination can present in these same areas very important values.
- the control means reduce the first component of the probe speed so as to lower the bending forces to increase the accuracy of the measurements.
- the probe being provided with three degrees of freedom
- the first, second and third components of the probe speed are each associated with one of the three degrees of freedom of the sensor. probe.
- the probe rotating about an axis of rotation for its sliding along the complete contour of the bezel of the eyeglass frame circle
- the first component of the probe speed is constituted by the speed of rotation of the probe around said axis of rotation.
- the second component of the speed of the probe is a transverse component of the speed of the probe axis perpendicular to the axis of rotation of the probe.
- the third component of the speed of the probe is an axial component of the speed of the probe axis parallel to the axis of rotation of the probe.
- the first component of the probe speed decreases when the second and / or third component of the probe speed increases.
- the second and the third components of the probe speed varying one and the other continuously each in a range of intervals interval velocities, the means of control change the first component of the probe speed when the second and / or third component of the probe speed changes interval.
- the method therefore provides for varying the first component of the speed of the probe in steps such that the probe has a constant and high speed of rotation in the areas other than these localized areas of the frame, and a lower speed in these localized areas.
- the present invention also provides a contour reading apparatus as defined in the introduction, wherein the determining means is adapted to determine at least one and / or the other of the second and third components of the probe speed. and the control means are capable of driving dynamically, continuously or in stages, the first component of the speed of the probe as a function of at least the second and / or third component of the speed of the probe determined by the determination means.
- Other advantageous and non-limiting features of the contour reading apparatus according to the invention are the following:
- the probe being provided with three degrees of freedom, a first of the three degrees of freedom of the probe is constituted by its ability to rotate about an axis of rotation, a second of the three degrees of freedom of the probe is constituted by its ability to translating along an axis parallel to the axis of rotation and a third of the three degrees of freedom of the probe is constituted by its ability to move relative to the axis of rotation;
- control means are able to control the first component of the speed of the probe according to the first of the three degrees of freedom of the probe;
- the determination means are able to determine the second component of the speed of the probe according to the second of the three degrees of freedom of the probe.
- the determination means are able to determine the third component of the speed of the probe according to the third of the three degrees of freedom of the probe.
- the contour reading apparatus comprises a turntable rotatably mounted about the axis of rotation relative to the mounting means of the frame, this turntable carrying a reading subassembly which comprises the movable feeler of a part in a direction parallel to the axis of rotation and secondly in a plane transverse to the axis of rotation, the reading subassembly further comprises another axis of rotation called transverse bearing axis to the surface of the turntable and a support arm which, at one of its ends, is rotatably mounted around said carrier axis and on which is embarked at the other end of said probe.
- a reading subassembly which comprises the movable feeler of a part in a direction parallel to the axis of rotation and secondly in a plane transverse to the axis of rotation
- the reading subassembly further comprises another axis of rotation called transverse bearing axis to the surface of the turntable and a support arm which, at one of its ends, is rotat
- the reading subassembly pivoting about the carrier axis the probe rod may have a very large inclination relative to the normal to the tangent to the bezel. This inclination depends in fact on the shape of the frame, but also on the angular position of the reading subassembly around the bearing axis. Consequently, the control means make it possible to control the speed of rotation of the turntable, which corresponds here to the first component of the speed of the probe, as a function of the second and third components of the speed of the probe, which makes it possible to take account of not only the shape of the frame (elongated and / or arched) but also the angular position of the reading subassembly.
- FIG. 1 is a perspective view of a contour reading device receiving an eyeglass frame whose shape of the circles is intended to be raised by a probe;
- FIGS. 2 and 3 are perspective views of the bottom of the turntable extracted from the apparatus of Figure 1, these Figures 2 and 3 for seeing from two different angles the reading subassembly carried by the turntable;
- FIG. 4 is a sectional view of the circles of the spectacle frame received by the contour reading apparatus of FIG. 1;
- FIG. 5 is a graph showing the outline of one of the circles of the spectacle frame of FIG. 4;
- FIG. 6 is a graph showing the variation in the altitude of the points of the outline of the bezel of one of the circles of the spectacle frame of FIG. 4;
- FIG. 7 is a graph showing the variation of the radial velocity of the probe of FIG. 1 during the reading of one of the circles of the spectacle frame of FIG. 4;
- FIG. 8 is a graph showing the variation of the axial speed (that is to say substantially along the axis of the circle read, which is here vertical) of the probe of FIG. 1 during the reading of one of the FIG. 1 is a general view of a contour reading apparatus 1 as it is presented to its user.
- This apparatus comprises an upper cover 2 covering the entire apparatus except for a central upper portion.
- the contour reading device 1 also comprises a set of two jaws 3, at least one of the jaws 3 is movable with respect to the other so that the jaws 3 can be moved closer to each other or separated from each other. form a clamping device.
- Each of the jaws 3 is further provided with two clamps each formed of two movable studs 4 to be adapted to clamp together a frame 10 of spectacles. The frame 10 can then be held stationary on the contour reading device 1. In the space left visible by the central upper opening of the hood
- a chassis 5 is visible.
- a plate (not visible) can move in translation on this frame 5 according to a transfer axis D.
- On this plate is mounted rotating 6.
- This turntable 6 is therefore able to take two positions on the transfer axis D, a first position in which the center of the turntable 6 is disposed between the two pairs of studs 4 fixing the right circle of the mount 10, and a second position in which the center of the turntable 6 is disposed between the two pairs of studs 4 fixing the left circle of the frame 10.
- the right circle and the left circle of the frame are circles intended to be respectively positioned opposite the right eye and the left eye of the wearer when the latter carries said mount.
- the turntable 6 has an axis of rotation B defined as the axis normal to the front face of the turntable 6 and passing through its center.
- the turntable 6 further comprises an oblong slot 7 in the form of an arc of a circle through which a feeler 8 has a bearing rod 8A and at its end a feeler pin 8B intended to follow by sliding or possibly rolling the contour of the frame 10 palpated.
- the turntable 6 is guided in rotation about a first axis, its axis of rotation B, by three guide rollers (not shown) arranged regularly along its periphery and held on the plate 5 of the reading device of FIG. contour 1.
- the rotation of the plate 6 is controlled by a motor-encoder (not shown) whose output shaft is provided with a pinion meshing with a ring gear equipping the periphery of the plate 6.
- This motor-encoder allows a reading at any time of the angular position of the plate 6 corresponding to an angular position TETA of the probe 8.
- the arcuate light 7 has a length approximately corresponding to the radius of the turntable 6 and extends between the center of the turntable 6 and its periphery.
- the circular arc described by the light 7 is centered around a carrier axis A.
- the turntable 6 can be extracted from the frame 5. It is then as shown in Figures 2 and 3.
- the perspective view of Figure 2 shows a groove 14 disposed on the wafer of the turntable 6, over its entire circumference. This groove 14 cooperates with the guide rollers of the plate.
- the turntable 6 carries a reading subassembly 15.
- Figures 2 and 3 show the reading subassembly 15 at two different angles of view.
- the reading subassembly 15 comprises a bearing 16 on which is mounted a carrier shaft 17 rotatably mounted on the turntable 6. This carrier shaft 17 has as axis the carrier axis A.
- a carrier arm 18 is mounted on the carrier shaft 17.
- the carrier arm 18 has at one of its ends a ring 20 allowing the carrier arm 18 to rotate about the carrier axis A and a translational movement along that axis.
- the support arm 18 comprises a cylindrical support 21 on which is fixed the support rod 8A of the probe 8 so that the axis of this support rod 8A remains parallel to the carrier axis A .
- This assembly allows the probe 8 to present a movement in an arc along the light 7, in a plane orthogonal to the axis of rotation B of the turntable 6, this axis of rotation B being here parallel to the axis A
- the probe 8 can perform an input / output movement with respect to the front face of the turntable 6, when the carrier arm 18 slides along the axis A.
- the feeler 8 is provided with three degrees of freedom, including a first degree of freedom TETA consisting of the ability of the feeler 8 to rotate about the axis of rotation B through the rotation of the turntable 6, a second degree of freedom Z constituted by the ability of the probe 8 to translate along an axis parallel to the axis of rotation B by sliding the support arm 18 along the axis A, and a third degree of freedom R constituted by the ability of the feeler 8 to move relative to the axis of rotation B thanks to its freedom of movement along the arc formed by the light 7.
- a first degree of freedom TETA consisting of the ability of the feeler 8 to rotate about the axis of rotation B through the rotation of the turntable 6
- a second degree of freedom Z constituted by the ability of the probe 8 to translate along an axis parallel to the axis of rotation B by sliding the support arm 18 along the axis A
- a third degree of freedom R constituted by the ability of the feeler 8 to move relative to the axis of rotation B thanks to
- Each point read by the end of the probe 8 is located in a corresponding coordinate system R, TETA, Z.
- the probe 8 thus has a decomposable speed into three distinct components, a first component called rotation speed VP corresponding to the rotational speed of the turntable 6, a second component called radial velocity VR corresponding to the transverse component of the speed of the probe 8 along an axis perpendicular to the axis of rotation B and passing through the end of the probe 8, and a third component called axial speed VZ corresponding to the axial component of the speed of the probe 8 along the axis of rotation B.
- rotation speed VP corresponding to the rotational speed of the turntable 6
- VR radial velocity
- VZ axial speed
- the reading subassembly 15 also comprises a guide arm 22 attached to the base of the shaft 17.
- This guide arm 22 has a length sufficient to reach the light 7.
- the guide arm 22 comprises a semicircular portion toothed 26 centered on the carrier axis A.
- the teeth of the semicircular portion 26 mesh with an intermediate gear 27 which meshes with the gear (not visible) of a motor-encoder 28 mounted on a yoke 29 which is fixed on the turntable 6.
- the teeth of the intermediate gear 27 have not been shown to make the drawings clearer.
- the guide arm 22 comprises a vertical clevis 30, arranged parallel to the bearing axis A, on which is fixed a motor-encoder 31 whose pinion 32 meshes with a rack 33 fixed on the ring 20 of the carrier arm 18.
- the rack 33 is arranged parallel to the carrier axis A.
- the teeth of the pinion 32 have not been represented for the same reasons of clarity as before.
- the encoder motor 28 is therefore able to rotate the feeler 8 about the carrier axis A. It therefore allows the probe 8 to exert a force along an axis of effort E tangent to the arc described by the light 7.
- the motor-encoder 31 is itself able to move the probe 8 along an axis parallel to the carrier axis A. In particular, it makes it possible to exert a so-called mass compensation torque Cz which cancels the mass of the probe 8 and the carrier arm 18 seen by the bezel 10A of the frame 10 when the bezel and the probe are in contact with each other.
- the contour reading apparatus 1 further comprises means 101 for determining the position R, TETA, Z of the end of the feeler finger 8B of the feeler 8 and of its speed, in particular of its axial and radial components VZ VR.
- dynamic control means 102 that is to say in real time, the speed of the probe 8.
- All of these determination means 101 and control 102 is integrated in an electronic device and / or computer 100 allowing, on the one hand, to actuate the encoder motors 28, 31, and on the other hand, recovering and recording the data transmitted by these encoder motors 28, 31.
- These data are here transmitted in the form of voltage slots sent by the encoder motors 28, 31 when they pivot.
- Figure 4 shows the upper end of the probe 8 having the feeler finger 8B.
- This feeler finger 8B points along an axis perpendicular to the axis of the support rod 8A. It has a pointed end intended to fit into the bezel 10A of a circle of the frame 10 to raise the geometry of its outline.
- each point of the contour of the bezel 10A can be defined by three spatial coordinates corresponding to the coordinates R, TETA, Z of the end of the probe 8.
- a point of the mount is therefore identified by its radial coordinate R separating this point from the center of the turntable 6, its angular position TETA relative to, for example, the angular position of the first point palpated, and its altitude Z.
- we are particularly interested in elongated frames that is to say, having, once installed on the wearer's face, a low height and a large width between the two arms of the frame
- / or strongly arched with respect to the general plane of the circles of the frame 10.
- An example of a strongly arched mount is shown in FIG. 4.
- the camber of a frame can be quantified using a curve angle J.
- This curve angle J corresponds to the angle formed between the general plane K of the circles of the frame 10 (vertical plane passing through the bridge) nasal connecting the two circles of the mount) and the axis L defined as being the axis passing through two distinct points of the bezel 1OA (typically one located near the nasal part of the circle and the other near the part temporal circle) and having the greatest inclination relative to the general plane K of the circles of the frame 10.
- This type of strongly arched frames 10 generally also has a twisting of the bezel 10A commonly called "pouring".
- FIG. 5 The contour of the bottom of the bezel of a circle of the frame 10 has been shown schematically in FIG. 5.
- the contour represented in this FIG. 5 has been discretized into eight distinct arcs presenting at their ends points P1 and P2, P2 and P3 up to P8 and P1.
- each of the points P1, P2, P3, P4, P5, P6, P7, P8 has an altitude Z respectively denoted Z1, Z2, Z3, Z4, Z5, Z6, Z7, Z8 shown in FIG.
- a standard caliber of shape is used any.
- 800 separate points are used.
- the coordinates of these measurement points are preferably stored in memory in the contour reading apparatus 1. If several calibres are used, these calibers are numbered, and these numbers are stored in memory in the apparatus, in order to avoid associating a set of measurement points with a gauge does not correspond to it.
- Such a three-dimensional machine may for example be constituted by a contour reading device of the same type as that described here and shown in FIGS. 1 to 3 but suitably calibrated and / or made with a structure and / or mechanical components of higher precision. .
- the caliber has a geometry such that, when probing in the three-dimensional machine, the measured radius and height vary in large proportions, ideally throughout the measurement range of the contour reading apparatus.
- the template may have a shape in two dimensions (for example an ellipse) in a plane inclined by twenty degrees relative to the horizontal.
- the measuring points MRi (XRi, YRi, ZRi) are given in a coordinate system whose X axis is the horizontal axis passing through the center of the two jaws of the three-dimensional machine, of which the Y axis is the horizontal axis perpendicular to the X axis, whose Z axis is the vertical axis perpendicular to the X and Y axes and whose origin O is located at the center of the segment connecting the centers of the two upper jaws.
- the angle TETAO corresponding to the difference between the actual TETA angular position of a point measured by the probe and the TETA angular position acquired by the contour reading apparatus, assuming this constant difference; the angle PCX which corresponds to the parallelism defect, along the axis X, between the axis of rotation B of the turntable 6 and the vertical axis Z;
- the difference along the X axis between a point measured on the contour reading apparatus 1 and this same point measured on the three-dimensional machine is defined by dXO.
- the distance along the Y axis between a point measured on the contour reading apparatus 1 and this same point measured on the three-dimensional machine is defined by dYO.
- the difference along the Z axis between a point measured on the contour reading apparatus 1 and this same point measured on the three-dimensional machine is defined by dZO.
- Calibration is then performed according to the following steps.
- the 800 measurement points of the calibration caliber are acquired and recovered using the three-dimensional machine.
- the standard gauge is read using the contour reading device 1.
- the parameters TETAO, PCX, RO, PPY, PPX, dAB, LBiIIe, dXO, dYO and dZO are then searched which make it possible to minimize the difference between the two sets of points MLi and MRi.
- the points MLi are corrected by modifying the values of the parameters chosen, a set of MLCORRi points is deduced therefrom, and the difference between the coordinates of the points MLCORRi and MRi is calculated.
- this difference between the points MLCORRi and MRi is not negligible (that is to say as long as the differences between their respective coordinates are not all less than predefined threshold values), the parameters are modified again. to reduce this difference.
- the measured points MLi can be corrected with the optimum parameters obtained TETAOoptim, PCXoptim, ROoptim, PPYoptim, PPXoptim, and Aboptim. LBilleoptim.
- this frame 10 is inserted between the pads 4 of the jaws 3 so that each of the circles of the frame 10 is ready to be palpated along a path starting by the insertion of the probe between two studs 4 corresponding to the lower part of the frame 10, then following the bezel 10A of the frame 10, to cover the entire circumference of the circle of the frame 10.
- the electronic and / or computer device 100 calibrates the mass compensation torque Cz so that the probe 8 is at equilibrium regardless of its altitude Z with respect to the turntable 6.
- the probe 8 is first inserted in the right circle of the mount 10.
- the plate 5 on which the turntable 6 is mounted moves with the aid of a motor and a link rack (not shown) so that the center of the turntable 6 is disposed between the two pairs of studs 4 of the two jaws 3 fixing the right circle of the frame 10.
- the feeler finger 8B is then automatically placed at a known altitude Z and corresponding to the altitude of the point situated at half height between two studs 4 for fixing the frame 10.
- the reading subassembly 15 has an on-board mechanism allowing movement of the feeler 8 parallel to the axis A.
- This mechanism comprises the encoder motor 31 which is adapted to arrange the ring 20, and consequently the carrier arm 18, at the desired height on the shaft 17.
- the probe 8 can thus have a vertical movement along the axis Z '.
- the feeler finger 8B then moves in the plane of attachment of the frames 10 towards a point located between the two studs 4 for fixing the frame 10 on its lower part.
- a joint movement of rotation about the axis A of the guide arm 22 and the support arm 18 allows the guide arm 22, driven by the motor-encoder 28, to drive itself the feeler 8 in rotation around the axis A, along the light 7.
- the turntable 6 defines as zero the angular position TETA and the altitude Z of the end of the 8.
- the guide rollers of the turntable 6 are then able to rotate the reading subassembly 15 relative to the fixed frame 5, the reading subassembly 15 being on board the turntable 6.
- the motor encoder (not shown) which drives the rollers inserted in the groove 14 not only causes rotation of the turntable 6 but also allows the electronic and / or computer device 100 to know the value of the angular position TETA (in degrees) that the feeler 8 from its initial position.
- the value of the angular position TETA of the probe 8 increases at a nominal speed VO.
- This nominal velocity VO is here of 2.8 hundredths of a degree per millisecond.
- the probe 8 moves along the bottom of the bezel 10A and is guided according to its radial coordinate R and according to its altitude Z by this bezel 10A.
- the probe being inserted into the right circle of the frame 10, the probe 8 moves in the trigonometrical direction.
- the encoder motor 28 thus drives the turntable and also acts as an encoder to identify the successive positions of the carrier arm 18 along the light 7.
- the encoder motor 28 thus delivers a signal enabling the determination means 101 of the electronic and / or computer device 100 to know at all times the radial coordinate R of the feeler finger 8B with respect to the axis of rotation B of the turntable 6.
- the motor-encoder 31 exerts a so-called mass compensation torque Cz intended to at least artificially cancel the weight of the assembly formed by the support arm 18 and the probe 8.
- the encoder motor 31 also operates simultaneously in the same manner. encoder which allows the determination means 101 of the electronic device and / or computer 100 to know the altitude Z of the probe finger 8B of the probe 8.
- this altitude Z in millimeters
- TETA in degree
- the electronic and / or computer device 100 can then possibly determine the coordinates of the probing finger 8B in a fixed reference frame attached to the frame 5. It can thus memorize a digital image of the contours of the two bezels 10A of the circles of the mount in the same frame.
- the set of encoder motors 28, 31 allows the electronic and / or computer device 100 to determine the spatial coordinates R, TETA, Z of the point palpated by the probe 8 and consequently the spatial coordinates of a set of points characterizing the outline of the bottom of the bezel when the probe 8 has accurately palpated the entire contour of the bezel 10A.
- the electronic and / or computer device 100 notes in particular the values of the radial coordinates R of the probed points in order to determine, with the aid of a suitable derivation software, the instantaneous radial velocity V R of probe 8 (corresponding to the transverse component of the speed of the probe 8).
- the evolution of this radial velocity VR (in hundredths of millimeters per millisecond) as a function of the TETA angular position of the turntable 6 (in degrees) is represented in the graph of FIG. 7 for a rotational speed VP of the turntable 6 constant and equal to its nominal speed VO.
- the radial velocities VR of the probe 8 denoted VR1, VR2, VR3, VR4, VR5, VR6, VR7, VR8 respectively taken at points P1, P2, P3, P4, P5, P6, P7, P8 are represented.
- the electronic and / or computer device 100 also records the values of the elevations Z of the probed points in order to determine, using the derivation software, the instantaneous axial speed VZ of the probe 8 (corresponding to the axial component of the speed of the probe 8 ).
- the evolution of this axial speed (in hundredths of millimeters per millisecond) according to the angular position of the turntable 6 (in degrees) is shown in the graph of Figure 8 for a rotation speed VP of the turntable 6 constant and equal to its nominal speed VO.
- VZ1, VZ2, VZ3, VZ4, VZ5, VZ6, VZ7, VZ8 taken respectively at the points P1, P2, P3, P4, P5, P6, P7, P8.
- the rotational speed VP of the turntable 6 is dynamically controlled to vary during reading as a function of the axial speed VZ and the radial speed VR of the probe 8.
- the radial velocity VR of the probe 8 and the variation speed of the radial coordinate R of the probed point as a function of the angular position TETA of the turntable 6 are two identical quantities.
- the TETA angular position of the turntable 6 is a function of time
- the radial velocity VR is mathematically related to the speed of variation of the radial coordinate R of the probed point as a function of the TETA angular position of the turntable 6.
- the axial velocity VZ of the probe 8 and the velocity variation of the altitude Z of the probed point as a function of the angular position TETA of the turntable 6 are two identical quantities.
- the rotational speed VP of the turntable 6 is therefore possible to control the rotational speed VP of the turntable 6 according to one of these magnitudes.
- the radial velocity V R and the axial velocity V Z of the probe 8 here and there vary each continuously in a velocity range respectively between -5 and 5 hundredths of a millimeter per millisecond and between -7 and 7 hundredths of a millimeter. millisecond.
- these two velocity domains are divided into three intervals.
- the control means 102 change the rotational speed VP of the turntable 6. More precisely, the electronic and / or computer device 100 is programmed so that, the value of the angular position TETA of the probe 8 increasing,
- the control means 102 decrease the rotational speed VP of the turntable 6 to a value corresponding to one third of its nominal speed VO; - if on the other hand, the radial velocity VR of the probe 8 is lower in absolute value to the value of 1.7 cents per millimeter per millisecond and if its axial velocity VZ is lower in absolute value than the value of 2.3 hundredths of a millimeter per millisecond, then the control means 102 stabilize the speed of rotation of the turntable 6 at its nominal speed VO;
- control means 102 stabilize the rotational speed VP of the turntable 6 at a speed corresponding to half of its nominal speed VO.
- the measured values of radial velocity VR and axial VZ probe 8 can be filtered and smoothed by ad hoc software integrated electronic device and / or computer 100 before being compared across the aforementioned intervals.
- the contour of which is shown in FIG. 5 it is firstly noted on the graph of FIG. 7 that the radial velocity V R of the probe 8 exceeds, in absolute value, 1, 7 hundredths of millimeter per millisecond in an angular range of about 135 degrees interspersed between points P1 and P4 and between points P6 and P7 of the bezel contour 10A.
- the rotation speed VP of the probe 8 is not limited to three programmed speeds step-by-step, but that it can to vary continuously according to a preprogrammed function associating with each measured axial speed pair VZ and radial VZ, a rotational speed VP of the turntable 6.
- the guide rollers of the turntable 6 stop.
- the bezel 1OA of the right circle of the frame 10 then has a contour of known shape.
- the probe 8 descends along the axis Z 'under the mount 10.
- the plate then moves transversely along the transfer axis D in order to reach its second position in which the center of the turntable 6 is positioned between the studs 4 of the two clamps 3 enclosing the left circle of the frame 10.
- the feeler 8 is then placed automatically at the height Z inside the second circle of the frame 10 to be measured, against the bezel of this second circle, between the two studs 4 for fixing the lower part of this circle of the frame 10.
- the probing of the bezel is then performed in the same manner as before but in the opposite trigonometrical direction.
- the present invention is not limited to the embodiment described and shown, but the art can apply any variant within his mind.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
- Eyeglasses (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0602361A FR2898690B1 (fr) | 2006-03-17 | 2006-03-17 | Methode de pilotage de palpeur pour lecture de drageoir de monture de lunettes et appareil de lecture correspondant |
PCT/FR2007/000399 WO2007107645A1 (fr) | 2006-03-17 | 2007-03-06 | Methode de pilotage de palpeur pour lecture de drageoir de monture de lunettes et appareil de lecture correspondant |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1996368A1 true EP1996368A1 (fr) | 2008-12-03 |
EP1996368B1 EP1996368B1 (fr) | 2012-06-27 |
EP1996368B9 EP1996368B9 (fr) | 2012-10-03 |
Family
ID=36649865
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07731098A Active EP1996368B9 (fr) | 2006-03-17 | 2007-03-06 | Methode de pilotage de palpeur pour lecture de drageoir de monture de lunettes et appareil de lecture correspondant |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1996368B9 (fr) |
FR (1) | FR2898690B1 (fr) |
WO (1) | WO2007107645A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007015808A1 (de) * | 2007-03-30 | 2008-10-02 | Buchmann Deutschland Gmbh | Verfahren zum Abtasten der Kontur von Brillenfassungsöffnungen und Verwendung der Vorrichtung zum Abtasten der Kontur von Brillenfassungsöffnungen für das Umfangsschleifen von Brillengläsern |
DE602007010282D1 (de) * | 2007-12-28 | 2010-12-16 | Essilor Int | Verfahren zur Bestimmung der Parameter für die Trägerherstellung einer Kontaktlinse |
JP5377876B2 (ja) * | 2008-03-28 | 2013-12-25 | 株式会社トプコン | 眼鏡枠形状測定装置 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6243960B1 (en) * | 1999-03-16 | 2001-06-12 | National Optronics, Incorporated | Tracer, clamp and object engager for holding and tracing a lens mount of an eyeglass frame, a lens, and/or a lens pattern, to reliably detect a shape thereof even when the shape includes high wrap |
DE60042467D1 (de) * | 1999-04-30 | 2009-08-13 | Nidek Kk | Schablone Halter, gezielte Linzenform Messvorrichtung mit diesem Halter, und Brillenglaslinzen Bearbeitungsvorrichtung mit dieser Messvorrichtung |
JP3695988B2 (ja) * | 1999-04-30 | 2005-09-14 | 株式会社ニデック | 眼鏡枠形状測定装置 |
JP3839185B2 (ja) * | 1999-04-30 | 2006-11-01 | 株式会社ニデック | 眼鏡レンズ加工装置 |
JP4566372B2 (ja) * | 2000-07-19 | 2010-10-20 | 株式会社トプコン | レンズ枠形状測定装置 |
JP4267228B2 (ja) * | 2001-12-03 | 2009-05-27 | 株式会社トプコン | レンズ枠形状測定装置 |
FR2870933B1 (fr) * | 2004-05-28 | 2008-03-14 | Essilor Int | Appareil de lecture de contour comportant un capteur d'effort |
-
2006
- 2006-03-17 FR FR0602361A patent/FR2898690B1/fr not_active Expired - Fee Related
-
2007
- 2007-03-06 EP EP07731098A patent/EP1996368B9/fr active Active
- 2007-03-06 WO PCT/FR2007/000399 patent/WO2007107645A1/fr active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2007107645A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1996368B1 (fr) | 2012-06-27 |
WO2007107645A1 (fr) | 2007-09-27 |
FR2898690B1 (fr) | 2008-05-23 |
EP1996368B9 (fr) | 2012-10-03 |
FR2898690A1 (fr) | 2007-09-21 |
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