EP1392472B1 - Automatische oder halbautomatische maschine für das aussenkonturfräsen einer linse - Google Patents

Automatische oder halbautomatische maschine für das aussenkonturfräsen einer linse Download PDF

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Publication number
EP1392472B1
EP1392472B1 EP02745486A EP02745486A EP1392472B1 EP 1392472 B1 EP1392472 B1 EP 1392472B1 EP 02745486 A EP02745486 A EP 02745486A EP 02745486 A EP02745486 A EP 02745486A EP 1392472 B1 EP1392472 B1 EP 1392472B1
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EP
European Patent Office
Prior art keywords
support
lens
glass
frame
optical
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.)
Expired - Lifetime
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EP02745486A
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English (en)
French (fr)
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EP1392472A2 (de
Inventor
James Thepot
Laurent Guillermin
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EssilorLuxottica SA
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Essilor International Compagnie Generale dOptique SA
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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
    • 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
    • B24B49/12—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 involving optical means
    • 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
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/005—Blocking means, chucks or the like; Alignment devices
    • B24B13/0055—Positioning of lenses; Marking of lenses
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/02—Frames; Beds; Carriages
    • 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 invention relates to an ophthalmic lens trimming device and more particularly relates to an improvement for automating the handling and handling of glass between, on the one hand, a position where the optical characteristics thereof can determined using appropriate measuring means to determine a point of grip on said glass and, on the other hand, the clipping means.
  • These are typically constituted by a grinding wheel adapted to modify the outline of the glass to fit that of the frame or "circle" of a selected frame.
  • the technical part of the optician's job is to place an ophthalmic lens in each frame of the frame selected by the wearer. To do this, it is necessary to perform a number of operations.
  • the optician must locate the position of the pupil of each eye in the frame of the frame. It thus determines two parameters related to the morphology of the wearer, namely the inter-pupillary distance and the height of the pupil relative to the frame.
  • the optician must also perform a number of operations on the glass itself, before trimming, to identify some of its characteristics such as the optical center (in the case of a unifocal lens), or the direction of the lens. axis of progression and the position of the centering point for a progressive lens.
  • the optician defers certain characteristic points with a striking point on the ophthalmic lens itself. These marks are used to fix on the glass a centering pin and drive to correctly position the ophthalmic lens in a grinding machine to give it the desired contour, corresponding to the shape of the frame chosen. This piece is most often stuck temporarily on the glass with a double-sided adhesive.
  • the glass thus equipped is then placed in the clipping machine where it is given the shape corresponding to that of the chosen frame. It allows to define a geometric reference system in which we identify the points and directions characteristic of the glass, necessary for the coherence of this one with the position of the pupil, as well as the trimming values so that these points and directions are properly positioned in the mount.
  • the operator can resume machining. To do this, he can replace the glass in the machine, using the same centering pin.
  • the distribution of the operations mentioned above can be done on two or three workstations. Errors are possible because of the multiplication of manipulations. Moreover, if these operations are carried out within the framework of an industrial organization, this results in a considerable loss of time and a high cost of production. In addition, the risk of degradation of the ophthalmic lens increases with the number of manipulations.
  • the document EP 0 990 484 discloses an ophthalmic lens shaping device comprising a grinding unit, an eccentricity measuring unit, a tray conveyor and a lens conveyor. The latter is adapted to move an ophthalmic lens from the tray conveyor to a fixed support of the eccentricity measuring unit, then to clamping means of the grinding unit which allow only the rotation on itself of the lens.
  • the device described in this document makes it possible to optimize the process described above by automating as far as possible the measurement and positioning phases of the ophthalmic lens.
  • the invention also allows such an optimization, which makes it possible to determine the optical characteristics of the glass and to control the transport phase of the glass towards the trimming station and the trimming phase itself.
  • the means for superimposing the aforementioned characteristics can (in the case of a relatively elaborate embodiment, automatic operation) include calculation means for performing a "superposition" of data representative of the characteristics in question. They may nevertheless be supplemented by display means (for example a monitor) to enable an operator to visually control the superimposition of the representation of said characteristics and possibly the representation of the frame contour.
  • the gripping and clamping means are arranged (motorized) to rotate the glass around its gripping point, during the grinding phase.
  • the means for detecting the characteristics of the glass may be semi-automatic or automatic.
  • the operator places the ophthalmic lens on the support at a measurement location. It has at its disposal an electronic and computer system and a display screen for superimposing an outline representative of the shape of the "circle" of the frame, certain optical characteristics of the ophthalmic lens considered and information representative of the morphology of the wearer.
  • the optician then moves the glass on its support until the characteristic points of said glass appear on the screen at suitable locations relative to a reference representative of the wearer's morphology.
  • the representative contour of the frame determines the gripping point of the glass.
  • the latter moves along said predetermined path of the first reference frame (typically a rectilinear movement) so that the gripping and clamping means can be applied on either side of the glass and that it is transported to the grinding means.
  • said predetermined path of the first reference frame typically a rectilinear movement
  • the results of the readings and measurements carried out on the glass are exploited so that the means forming a clamp of gripping and clamping, come to grip the glass at a suitable point without it was necessary to adjust the position of said glass on the support.
  • the ophthalmic lens trimming device 10 shown in FIGS. Figures 1 to 3 comprises a support 3 of such a lens, movable along a predetermined path F, detection means 4 of certain characteristics of the lens 2, calculation means 16 comprising here viewing means 18 constituted by the screen of a monitor , grinding means 20 for contouring the edge of the ophthalmic lens to the desired shape and size, and gripping and clamping means 25 for conveying the ophthalmic lens 2 from the carrier 3 to the grinding means 20.
  • the support 3 is movable along said path F between a measurement position, predetermined with respect to said detection means 4 (FIG. figures 1 and 3 ) and a loading position (visible on the figure 2 ).
  • said predetermined path is rectilinear; it is defined by two parallel slides 15a, 15b between which the support 3 moves.
  • the latter is essentially constituted of a plate whose central part at less is transparent, for example glass. This plate moves in its own plane between the slides.
  • the drive means of the support are not shown, so as not to overload the drawing.
  • the plate is provided with projections 6 forming a tripod, to hold the glass.
  • the slides that define the path F materialize a first reference, specific to the support 3, which evolves here between the predetermined measurement position relative to said detection means 4 and said loading position.
  • the support 3 has a dual function. He maintains the glass during the measurement phase, without disturbing it because of its particular structure (transparency) and then transports it to a precise location where the glass is supported by the gripper and Tightening.
  • the means 4 for detecting the characteristics of the glass comprise, on either side of said predetermined position of the support, on the one hand, illumination means 8 including a light source S, and a collimation lens 9 specific to provide a complete parallel beam illuminating the glass, and, secondly, means 11 for analyzing the image transmitted by the glass installed on the support 3.
  • illumination means 8 including a light source S
  • collimation lens 9 specific to provide a complete parallel beam illuminating the glass
  • These include, in the example, an optical receiver 28 and a translucent screen 29 interposed between the support and the optical receiver.
  • the translucent screen 29 may consist of a frosted glass plate on the surface. To improve the readability of the information that appears on the frosted screen 29, the latter may be a rotatably mounted disk rotated in its own plane.
  • the optical receiver 28 may be a matrix receiver or, as shown, a camera. The optical axis of this receiver is perpendicular to the
  • the camera captures the image of the glass that forms on the frosted screen.
  • the information produced by the camera is addressed to the computing and visualization means 16, 18. They are processed by an electronic and computer system 30 which also receives information representative of the parameters mentioned above of interpupillary distance and height, via a transmission device 32 and information representative of the contour of the chosen frame. This information is by examples stored in a memory 34 and selected by the practitioner.
  • the electronic and computer system 30 produces an image that is displayed on the monitor screen of the display means 18. Therefore, in the semi-automatic adjustment version, it will be seen on this screen, on the same scale, the outline of the frame and that of the uncut glass, with its particular characteristics, in particular the marking points which are carried there. We will also see the gripping point 0 determined as indicated below, as well as the point or points representative of the morphology of the wearer.
  • the transparent support 3 comprises a clearance cutout 38, allowing said gripping means 25 to clamp the glass to a desired location on its surface and to disengage it from the support when it is in said loading position, so as to bringing said ophthalmic lens in the vicinity of the grinding means, to proceed with the trimming of this glass.
  • the gripping and gripping means 25 move in a second frame to transport said ophthalmic lens from said loading position to the grinding means.
  • these means comprise a generally C-shaped frame 39, mounted to move in controlled rotation about a vertical axis, perpendicular to the plane of the support 3.
  • the rotation of the frame makes it possible to bring a tight glass 2 by the grasping forceps, in an area of activity of the grinding means.
  • This frame comprises two arms 45, 46 extending on either side of a horizontal plane in which the support 3 moves.
  • the lower arm 45 carries a clamping and rotating drive shaft 48.
  • the other upper arm 46 carries a rotational drive shaft 49.
  • the two shafts 48, 49 are connected to common rotary drive means housed in the housing.
  • the two shafts are coaxial and provided at their ends facing clamping pads 50 for gripping and blocking an ophthalmic lens 2 taken from the support 3.
  • the clamping shaft 48 is meanwhile controlled movement along its own axis to ensure the gripping and blocking of ophthalmic glass.
  • the pivot axis 40 of the frame is parallel to the common axis of the shafts 48 and 49.
  • the frame 39 as a whole is movable and controlled in translation along its axis 40 (Z direction).
  • an ophthalmic lens grinder generally comprises several grinders stacked axially: two grinding wheels for roughing (one for plastics and one for mineral), a grinding wheel and, optionally, a grinding wheel for polishing.
  • two grinding wheels for roughing one for plastics and one for mineral
  • a grinding wheel and, optionally, a grinding wheel for polishing.
  • To achieve the different phases of the machining glass must pass successively on two or three grinding wheels. To do this, it is necessary to ensure a relative translation movement between the grinding wheels and the glass in a direction parallel to the axis of the grinding wheels.
  • On the other hand to hold the glass in a rimmed mount (whose contour is closed) must be made a bevel on its edge. This form is achieved by the finishing wheel, and possibly the polishing wheel, which has on its periphery a shaped hollow complementary to that of the bevel. To place this bevel in the right place on the edge of the glass is used the same translational movement of the glass relative to the wheels.
  • This relative movement could be achieved by a translation of the wheel support along their axis.
  • the frame 39 that makes this movement to facilitate the gripping of the glass. Indeed once the glass positioned manually or measured and the support 3 in the loading position, the frame 39 rotates about its axis 40 to position the shafts 48 and 49 in front of the gripping point, then it performs a downward translation until contacting the shoe 50 of the shaft 49 with the glass. Then the pad of the shaft 48 pinches the glass. The frame then rises along its axis 40, releases the glass 2 of the support 3 and then rotates around this same axis to position the glass in the grinding zone.
  • the frame can then rotate about 120 to 150 ° to bring the glass to be cut near the grinder.
  • the electronic and computer system 30 controls both the pivoting of the frame and the rotation of the glass around the common axis of the two shafts 48, 49, depending on the contour to be given to the ophthalmic lens.
  • the gripper and gripper means moves the glass in said second frame to transport the glass from the loading position to the grinding means and then rotate the lens around the common axis of the two shafts.
  • This second repository is linked to said first repository, that is to say that of support.
  • the distance between the common axis of the two shafts 48, 49 and the axis of rotation of the grinding means 20 is controlled in synchronism with the rotation of the glass around said common axis to give the glass the desired contour.
  • the pivoting of the frame 39 is controlled during grinding.
  • the center 0 of the rectangle 56 which surrounds the perimeter of the "circle" 57 of the frame and which therefore represents the final shape of the ophthalmic lens, is the point of the ophthalmic lens into which the clamping shoes 50 of the means forming grasping forceps 25.
  • Ophthalmic glass 3 can be of several types.
  • the optician will have to identify his optical center and possibly the axis of the cylinder, for the correction of astigmatism, using a known device called a lensmeter. With this device, three points are placed aligned on the surface of the glass. The central point corresponds to the optical center of the glass, the other two indicate the axis of the cylinder. If it is a progressive lens, it is usually delivered with an ink marking to identify the points needed for centering. Typically, this marking materializes the center of vision from far, the axis of progression and the near vision zone. If it is a focal bi or tri lens, the near vision "patch" is taken as a reference for centering.
  • the optician has a digitization of the shape of the frame chosen (memory 34) allowing it to introduce this shape into the electronic and computer system 30, in the form of data which make it possible to visualize the outline of the frame or
  • the optician informs the electronic and computer system 30 of inter-pupillary distance and height values, measured on the wearer.
  • a device 32 keyboard or other is an interface adapted to take into account and introduce into the system 30 characteristics representative of the morphology of the wearer.
  • the representative form of the mount is displayed on the screen and is positioned so that the center 0 of the rectangle in which the "circle" (see figure 4 ) corresponds to a specific point which will be the point of grip of the glass on the support 3, when the support is at said loading position.
  • a centering cross appears on the screen.
  • this cross corresponds to the optical center of the glass for a single focal glass, at the far vision point for a progressive lens or at the position of the center of the segment of the patch, for a focal bi or tri lens.
  • the electronic and computer system "receives the image" of the glass via the receiver 28, which allows to superimpose this image to those already displayed on the screen.
  • the optician can therefore vary the position of the glass on the support 3 so as to position the markings made on the glass relative to the centering cross.
  • the appearance of the "circle" of the frame makes it possible to control that the glass is large enough for mounting to be possible.
  • the optician does not have to intervene, in principle, since the support 3 is moved to the loading position where the glass is supported by said gripping and clamping means 25 then transported to the grinding means.
  • the carriage performs a translation while two rotations and a translation are performed by the means forming gripping and clamping pliers: a rotation about the axis 40 of said movable frame, a rotation about the axis common of the two shafts 48, 49.
  • the translation is in the direction Z. It is possible to envisage other embodiments having other combinations of translation (s) and rotation (s).
  • a device 104 for automatically detecting the characteristics of an ophthalmic lens capable of constituting an improved variant of the means for detecting characteristics of the glass represented on the figure 3 .
  • the electronic and computer system 30 can perform a more complete analysis of the image of the glass and automatically recognize, for example, the markings made on the glass or the segment of a double-focus glass.
  • the analysis of the image makes it possible to know the position of the markings of the glass in the reference frame of this support.
  • the system can then calculate the position of the center of the glass so that the optical center of the glass or another centering mark is correctly positioned in the frame.
  • the means forming a gripping and clamping pliers tighten the glass at this point.
  • This device 104 for automatically detecting the characteristics of an ophthalmic lens 102 comprises a support 103, here horizontal and consisting of a transparent glass plate provided with projections 106 forming a tripod, for holding such a glass and, on both sides of this support: on the one hand illumination means 108 including an optical system for developing a light beam directed towards the glass installed on the support and, on the other hand, means 110 for analyzing the image transmitted by the glass installed on the support.
  • the optical system 111 is arranged to define two possible optical paths 112, 113, switchable, for said light beam.
  • the illumination means comprise at least two switchable light sources S1, S2 corresponding respectively to the two optical paths mentioned above.
  • the two optical paths 112, 113 comprise a common portion 115 upstream of said support, more particularly determined between a semi-reflecting mirror 118 and the sensor 128. This mirror materializes the intersection of the two optical paths.
  • the mirror can be replaced by a separator cube or a removable mirror.
  • a mask forming a Hartmann matrix or the like is placed on only one of the paths (the path 112), at a location such that it occupies a predetermined position with respect to a optical axis 125 of said analysis means 110.
  • This optical axis 125 is in fact the common axis of some lenses of the optical system centered with respect to the source S1 and an optical receiver 128 forming part of the analysis means 110 located on the other side of the support 103.
  • the analysis means also comprise a translucent screen 129 frosted interspersed perpendicularly to this optical axis 125 between the support 103 and said optical receiver 128.
  • the latter can be a matrix sensor or a camera with lens.
  • the optical receiver is a matrix sensor, it is added a system of two lenses 130, 131 and a diaphragm 132 (telecentric system). If the optical receiver is a camera, these elements are replaced by the very purpose of the camera.
  • the frosted translucent screen 129 is preferably a glass or the like, frosted on the surface. This is a rotatably mounted disk rotated by a motor 135 about an axis parallel to and perpendicular to the optical axis 125.
  • the first light source S1 among these two sources is a so-called point source associated with at least one collimation lens 139 able to provide a complete parallel beam illuminating the mask 120.
  • the source S1 is used to establish a kind of mapping of the glass (measurement of power / astigmatism at several points of the glass), for the determination of the optical center of non-progressive glasses, and to reposition the objects on the front face of the glass (engraving, marking , segment) seen with S2.
  • S1 may optionally be movable along the optical axis or an axis perpendicular thereto.
  • the collimation lens 139 is centered on the aforementioned optical axis.
  • the optical system further comprises an expander consisting of two lenses 140, 141 also centered on the aforementioned optical axis and placed between the mirror and the support.
  • This expander makes it possible to generate a parallel light beam of larger size, greater than that of the glass, and to image the mask 120 on the surface of the ophthalmic lens.
  • a second light source S2 is arranged to illuminate the glass 102 installed on the support 103 via a portion of the optical system, excluding the mask 120 forming a Hartmann matrix.
  • This second light source is associated with the semi-reflecting mirror 118 which materializes the intersection of the two optical paths 112, 113.
  • This source S2 is a point source associated with at least one collimating lens capable of providing a complete parallel beam directed towards the mirror 118.
  • the beam generated by the lens S2 is perpendicular to the beam generated by the lens S1 and the mirror is at an angle of 45 ° with respect to the optical axis 125 so that the complete parallel beam from the source S2 is reflected on this mirror and directed towards the support 103 of the ophthalmic lens.
  • the light emitted by the source S2 splits into distinct light rays parallel to each other at the exit of the expander 140, 141.
  • the source S2 is mainly used for the determination of printed marks, relief engravings and segments (bifocal and trifocal glasses).
  • a mineral ophthalmic lens has diffusing etchings.
  • the device comprises at least one third light source and, in the example, several sources S31, S3n distributed circularly, at the periphery of the support 103, for illuminating in grazing light, such a glass placed on said support.
  • the light rays are diffused by the frosted, so it is necessary to provide either a frosted glass or a retractable glass having a polished area used only in this case.
  • the light sources mentioned S1, S2, above may be light-emitting diodes (LEDs) or laser diodes preferably associated with respective optical fibers.
  • the sources S31, S3n will preferably be light emitting diodes.
  • the source S1 is used in conjunction with the Hartmann matrix mask.
  • the complete parallel beam is transformed by the mask 120 into a plurality of individualized fine rays corresponding to the configuration of the mask. Each of these spokes strikes the entrance face (front face of the glass) parallel to the optical axis. These rays are deflected by the glass and are visualized as light spots on the rotating frosted screen 129.
  • the frosted is imaged on the matrix sensor, associated with the telecentric system or that of the camera, and the tasks are analyzed by a system. electronic and computer processing 16 ( figure 2 ) which determines their displacement.
  • the movement of the points of the mask (that is to say the light spots that appear on the frosted screen) after deflection by the glass is progressing linearly from the center to the periphery, compared to the positions of the same points when the support bears no ophthalmic glass.
  • the positions of the Hartmann mask points on the screen when the holder bears no glass are measured during a calibration phase. Therefore, measuring a displacement of this kind makes it possible to determine the type of glass. For example, for a convergent lens, the tasks are close to the optical axis, especially since the glass is powerful.
  • the displacement of the points varies along a so-called "line of progression" line.
  • the direction of the power gradient is determined by calculation by calculating the power at different points of the glass, for example according to the method which will be indicated below. This direction is the progression line. It is therefore possible to measure and calculate the orientation of the progression line, which is one of the important characteristics of a progressive lens.
  • the position of the optical center of this lens can easily be determined by comparing the points of the reference mask (appearing on the frosted screen 129 when no glass is positioned on the support) and the corresponding points of the mask displayed on the frosted screen after deflection by the glass.
  • the point of the mask that has not been deviated corresponds to the position of the optical center. Since there is generally no undifferentiated ray, an interpolation is made from the least deviated rays, for example by the use of the least squares method.
  • the position of the rear face of the glass is given with a good approximation by the position of the support since the glass is placed on it.
  • the image is still used on the frosted screen of the Hartmann matrix mask.
  • the position and the direction of the light rays are compared for several neighboring points, which makes it possible to calculate the position of the focus on the optical axis (and thus its power, which is the inverse of the distance from the focus to the glass) and the glass astigmatism (value and axis of astigmatism) if there is astigmatism.
  • These measurements are local and can be repeated on different areas of the glass, which makes it possible to obtain a glass power card.
  • the addition is defined as the difference between the maximum power and the minimum power of the glass.
  • the point of reference of the prism is defined as the point where the prism of glass is worth two-thirds of the addition.
  • the prism reference point is the center of a segment separating two markers engraved on the glass. Most often, this point is also marked by a specific printed marking.
  • the identification of the PRP is done by illuminating the glass from the light source S2, that is to say by avoiding the Hartmann mask 120.
  • the image transmitted by the ophthalmic lens appears on the frosted glass 129, it is perceived by the optical receiver 128.
  • the reading is accompanied by an appropriate image processing to better discern the engraved marks or markings.
  • This visualization of the engraved markings or markings and the determination of the PRP then makes it possible to determine the centering point of the progressive glass (analogous to the optical center). on which the position of the center of the pupil, of the wearer's eye and the horizontal axis which gives the orientation of the lens in the frame must coincide.
  • the glass is generally circular and this analysis mainly aims to determine its diameter. However, it may happen that the glass already has a shape close to that of the frame for which it is intended.
  • the image processing makes it possible to know the shape and the dimensions of the non-circular glass. The determination of the shape and dimensions of the glass makes it possible to verify that the latter is large enough to fit in the frame.
  • the S2 source is still used to display the ophthalmic lens on the frosted screen.
  • Appropriate image processing makes it possible to better observe the variations in light intensity on the screen and consequently to obtain a sharp outline of the limits of the segment, and to determine its position with precision.
  • the source S2 makes it possible to see the marks, engravings or segment but does not make it possible to determine their positions on the front face of the glass.
  • the source S1 makes it possible to calculate the precise position of these elements acquired with S2 on the front face of the glass. We proceed as follows. Suppose we consider light spot A, on the frosted screen 129, corresponding to one of the holes of the Hartmann mask.
  • the corresponding light beam strikes the front face of the glass 102 at A '.
  • the source S2 is turned on and the corresponding image which appears on the frosted screen is stored. Then, we turn on the source S1 and turn off the source S2.
  • the image of Hartmann's mask appears on the frosted screen 129.
  • the height of each hole of the Hartmann mask is known (distance of the hole relative to the optical axis 125). Therefore, for a given radius and since the characteristics of the expander 140, 141 are well known, the height of the radius corresponding to its point of entry on the front face of the ophthalmic lens 102 is known. say that we know the height of the point A 'corresponding to the point A.
  • the measurements normally carried out using the source S2 can be carried out under better conditions, when the ophthalmic lens is a mineral glass, by replacing the source S2 with one or more sources illuminating the front face of the ophthalmic lens in light. grazing.
  • the acquisition of the measurements indicated above makes it possible, in connection with the data acquired by the transmission device 32 and the memory 34, to determine the exact point of grip of the ophthalmic lens on the support 3 brought to said loading and control all movements of the frame 39 (pivoting about the axis 39 and rotation of the glass) during the trimming.
  • the monitor 18 is optional.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Eyeglasses (AREA)
  • Prostheses (AREA)
  • Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)

Claims (27)

  1. Vorrichtung zum Bearbeiten eines ophtalmischen Glases dadurch gekennzeichnet, dass sie enthält:
    - Detektionsmittel (4, 104) für die Charakteristika des Glases,
    - Mittel (32) zur Berücksichtigung der Charakteristika repräsentativ für die Morphologie eines Trägers,
    - Ein Support (3, 103) eines solchen Glases, der beweglich entlang zumindest eines, durch ein erstes Bezugssystem festgelegten Weges ist, zwischen einer Messposition, welche festgelegt ist bezüglich der Detektionsmittel und einer Aufnahmeposition.
    - Mittel (16) zur Überlagerung der Charakteristika des Glases und der Charakteristika repräsentativ für die Morphologie des Trägers,
    - Schleifmittel (20) für die Ränder des Glases, und
    - Mittel die eine Greif- und Klemmzange (25) formen, wobei diese beweglich sind entlang eines zweiten Bezugssystems, abhängig vom ersten Bezugssystem, zum Transport des Glases von der Aufnahmeposition zu den Schleifmitteln.
  2. Vorrichtung nach Anspruch 1 dadurch gekennzeichnet, dass der festgelegte Weg entlang dem der Support (3, 103) beweglich ist, geradlinig ist.
  3. Vorrichtung nach einem der Ansprüche 1 oder 2 dadurch gekennzeichnet, dass die Mittel die eine Greif- und Klemmzange formen (25) angeordnet sind, das Glas um seinen Greifpunkt herum zu schwenken.
  4. Vorrichtung nach einem der Ansprüche 1 bis 3 dadurch gekennzeichnet, dass die Mittel (16) zur Überlagerung der Charakteristika Visualisierungsmittel (18) umfassen.
  5. Vorrichtung nach einem der Ansprüche 1 bis 4 dadurch gekennzeichnet, dass der Support (3, 103) transparent ist und einen Entnahmeausschnitt (38) umfasst, der es den Mitteln welche die Greif- und Klemmzang formen erlauben, das Glas an einer gewünschten Stelle seiner Fläche zu klemmen und es dem Support zu entnehmen.
  6. Vorrichtung nach Anspruch 5 dadurch gekennzeichnet, dass der Support eine transparente Platte umfasst, welche in ihrer Ebene entlang von Führungsmitteln (15a, 15b) geradlinig beweglich ist.
  7. Vorrichtung nach Anspruch 6 dadurch gekennzeichnet, dass die transparente Platte mit Vorsprüngen (6, 106) ausgestattet ist, die zumindest ein Dreibein zum Halten des Glases ausformen.
  8. Vorrichtung nach einem der vorangegangenen Ansprüche dadurch gekennzeichnet, dass die Detektionsmittel (4) zumindest Visualisierungsmittel des Glases aufweisen, beidseitig des Supports, wenn der Support in der festgelegten Position ist, auf einer Seite Beleuchtungsmittel (8) und auf der anderen Seite Analysemittel (11) des Bildes, transmittiert durch das auf dem Support installierten Glases, umfassen.
  9. Vorrichtung nach Anspruch 8 dadurch gekennzeichnet, dass die Analysemittel einen durchscheinenden Mattschirm (29) umfassen, welcher senkrecht zu einer optischen Achse der Analysemittel an einem Punkt zwischen geschaltet ist, der sich zwischen dem Support und einem optischen Empfänger befindet.
  10. Vorrichtung nach Anspruch 9 dadurch gekennzeichnet, dass der durchscheinende Mattschirm drehbar montiert ist und drehangetrieben um eine Achse parallel und beabstandet zur optischen Achse ist.
  11. Vorrichtung nach Anspruch 9 dadurch gekennzeichnet, dass der optische Empfänger ein Matrizensensor oder eine Kamera (28) ist.
  12. Vorrichtung nach einem der Ansprüche 1 bis 7 dadurch gekennzeichnet, dass die Detektionsmittel (104) beidseitig der festgelegten Position des Supports aufweisen, auf der einen Seite Beleuchtungsmittel (108), welche ein optisches System beinhalten zur Erzeugung eines Lichtstrahles, welcher in Richtung eines auf dem Support installierten Glases gerichtet ist, und auf der anderen Seite Analysemittel (110) des durch des auf dem Support installierten Glases transmittierten Bildes umfasst, wobei das optische System angeordnet ist um zwei mögliche, umschaltbare optische Wege (112, 113) für den Lichtstrahl zu definieren, und wobei eine Maske (120) die eine Hartmann-Matrize oder analoge Form bildet, auf nur einem der beiden Wege platziert ist, an einer Stelle, so dass sie eine festgelegte Position im Bezug zu einer optischen Achse (125) der Analysemittel besitzt.
  13. Vorrichtung nach Anspruch 12 dadurch gekennzeichnet, dass die zwei optischen Wege (112, 113) einen gemeinsamen, dem Support vorgeschalteten, Abschnitt umfassen.
  14. Vorrichtung nach Anspruch 12 oder 13 dadurch gekennzeichnet, dass die Beleuchtungsmittel zumindest zwei umschaltbare Lichtquellen (S1, S2) umfassen, die jeweils den zwei optischen Wegen entsprechen.
  15. Vorrichtung nach Anspruch 14 dadurch gekennzeichnet, dass eine erste Lichtquelle (S1) der zwei Quellen eine Punktquelle ist, die mit zumindest einer geeigneten Linse zugeordnet ist, um einen parallelen Strahl bereitzustellen, welcher die Maske beleuchtet.
  16. Vorrichtung nach Anspruch 14 oder 15 dadurch gekennzeichnet, dass eine zweite Lichtquelle (S2) der zwei Quellen angeordnet ist, um das auf dem Support installierte Glas zu beleuchten, über einen Teil des optischen Systems ohne die Maske.
  17. Vorrichtung nach einem der Ansprüche 13 bis 15 dadurch gekennzeichnet, dass die zweite Lichtquelle (S2) mit einem halbreflektierenden Spiegel (118) zugeordnet ist, der den Schnittpunkt der zwei optischen Wege darstellt, wobei der Spiegel zwischen der Maske und dem Support zwischen geordnet ist.
  18. Vorrichtung nach Anspruch 16 oder 17 dadurch gekennzeichnet, dass die zweite Quelle (S2) eine sogenannte Punktquelle ist, der zumindest eine geeignete Linse zugeordnet ist, um einen parallelen Strahl bereitzustellen, der auf den Spiegel (118) gerichtet ist.
  19. Vorrichtung nach einem der Ansprüche 17 oder 18 dadurch gekennzeichnet, dass eine Expansionseinrichtung (140, 141) zwischen dem Spiegel und dem Support zwischen geordnet ist.
  20. Vorrichtung nach einem der Ansprüche 14 bis 19 dadurch gekennzeichnet, dass sie zumindest eine dritte Lichtquelle (S31, S3n) umfasst, angeordnet an der Peripherie des Supports (103) um ein, auf dem Support platziertes, Glas mit Streiflicht zu beleuchten.
  21. Vorrichtung nach einem der Ansprüche 12 bis 20 dadurch gekennzeichnet, dass die Analysemittel einen durchscheinenden Mattschirm (129) umfassen, welcher senkrecht zur optischen Achse, zwischen dem Support (103) und einem optischen Empfänger (128) zwischen geordnet ist.
  22. Vorrichtung nach Anspruch 21 dadurch gekennzeichnet, dass der durchscheinende Mattschirm (129) drehbar montiert ist und drehangetrieben ist um eine Achse, die parallel und beabstandet zur optischen Achse ist.
  23. Vorrichtung nach Anspruch 21 dadurch gekennzeichnet, dass der optische Empfänger (128) ein Matrizensensor oder eine Kamera ist.
  24. Vorrichtung nach einem der vorangegangenen Ansprüche dadurch gekennzeichnet, dass die Mittel die eine Greif- und Klemmzange formen (25), ein bewegliches Gestell (39) umfassen, wobei das Gestell zwei Arme (45, 46) aufweist, die sich beiderseits einer Ebene, in der sich der Support bewegt, erstrecken, wobei einer der Arme eine Klemmwelle (48) trägt und wobei der andere Arm eine Drehwelle (49) trägt, und wobei die zwei Wellen koaxial sind und an ihren Enden gegenüberstehende Klemmpuffer (50) aufweisen zum Greifen und Blockieren eines ophtalmischen Glases.
  25. Vorrichtung nach Anspruch 24 dadurch gekennzeichnet, dass das Gestell rotationsbeweglich um eine Achse (40) montiert ist, wobei die Achse senkrecht zur Ebene des Supports ist, und wobei die Drehung des Gestells es erlaubt ein zwischen die zwei Wellen geklemmtes Glas in eine Aktivitätszone der Schleifmittel (40) zu nehmen und das Schwenken des Gestells während des Schleifens gesteuert wird.
  26. Vorrichtung nach Anspruch 24 oder 25 dadurch gekennzeichnet, dass die Klemmwelle (48) translatorisch beweglich montiert, entlang ihrer Longitudinalachse gesteuert ist.
  27. Vorrichtung nach einem der Ansprüche 24 bis 26 dadurch gekennzeichnet, dass die Drehwelle (49) rotatorisch beweglich montiert, mit Bezug auf die eigene Longitudinalachse gesteuert ist.
EP02745486A 2001-06-05 2002-06-05 Automatische oder halbautomatische maschine für das aussenkonturfräsen einer linse Expired - Lifetime EP1392472B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0107315 2001-06-05
FR0107315A FR2825308B1 (fr) 2001-06-05 2001-06-05 Dispositif automatique ou semi-automatique pour le detourage d'un verre ophtalmique
PCT/FR2002/001918 WO2002098606A2 (fr) 2001-06-05 2002-06-05 Dispositif automatique ou semi-automatique pour le detourage du profil exterieur d'un verre ophtalmique

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EP1392472A2 EP1392472A2 (de) 2004-03-03
EP1392472B1 true EP1392472B1 (de) 2011-02-23

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JP (1) JP4001576B2 (de)
AT (1) ATE499181T1 (de)
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DE (1) DE60239270D1 (de)
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WO (1) WO2002098606A2 (de)

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US7201631B2 (en) 2007-04-10
DE60239270D1 (de) 2011-04-07
FR2825308B1 (fr) 2003-10-10
US20040142642A1 (en) 2004-07-22
FR2825308A1 (fr) 2002-12-06
ATE499181T1 (de) 2011-03-15
AU2002317220A1 (en) 2002-12-16
JP4001576B2 (ja) 2007-10-31
WO2002098606A2 (fr) 2002-12-12
JP2004532135A (ja) 2004-10-21
EP1392472A2 (de) 2004-03-03
WO2002098606A3 (fr) 2003-09-25

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