EP0855248B1 - Method for NC shaping of spectacle lenses - Google Patents

Method for NC shaping of spectacle lenses Download PDF

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Publication number
EP0855248B1
EP0855248B1 EP97108290A EP97108290A EP0855248B1 EP 0855248 B1 EP0855248 B1 EP 0855248B1 EP 97108290 A EP97108290 A EP 97108290A EP 97108290 A EP97108290 A EP 97108290A EP 0855248 B1 EP0855248 B1 EP 0855248B1
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EP
European Patent Office
Prior art keywords
lens
spectacle
thickness
data
facet
Prior art date
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Expired - Lifetime
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EP97108290A
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German (de)
French (fr)
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EP0855248A1 (en
Inventor
Lutz Dr.Ing Gottschald
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Wernicke and Co GmbH
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Wernicke and Co GmbH
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Publication of EP0855248A1 publication Critical patent/EP0855248A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B9/00Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02Machines 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
    • B24B9/06Machines 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
    • B24B9/08Machines 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
    • B24B9/14Machines 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B47/00Drives or gearings; Equipment therefor
    • B24B47/22Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation
    • B24B47/225Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation for bevelling optical work, e.g. lenses

Definitions

  • the invention relates to a method for Determine the course of the facets on the edge of lenses to be shaped and to control the Shape processing according to the determined facet course.
  • the course of the facets on the edge of those to be machined Eyeglass lenses should be determined in such a way that shape-processed glasses without rework in a corresponding selected glasses frame can and should be used aesthetic reasons on the circumferential edge of the ground Eyeglass lenses the same distance from wherever possible Have front edge, even if the lens is one of the circular shape has a very different shape to the Glasses frame does not differ in the forward direction to face.
  • the peripheral edge and the roof facet of a lens are the Shape of the lens and personal optometric data of the glasses wearer in the form of a quantity of data with which can control a lens molding machine so that a Raw glass according to the personal optometric data of the Glasses wearer with regard to the optical surfaces as well according to the shape of the selected frame edged and the roof facet so on the peripheral edge of the molded eyeglass is placed on the entire circumference runs on the circumferential edge and for example a certain distance from the front edge of the machined Observes glasses.
  • the data relating to the shape of the eyeglass frame can be in the form a quantity of data provided by the eyeglass frame manufacturer are present or can be obtained in that the glasses frame in a device for scanning the facet groove used and the Amount of data can be recorded in three-dimensional form.
  • the faceted groove in a spectacle frame due to manufacturing tolerances or shape deviations must necessarily lie on a spherical surface.
  • a device for three-dimensional scanning of Eyeglass frames is the German utility model 86 08 201 U1 Applicant described.
  • the one described Measuring device is in the CNC controlled Glasses edge grinding machine integrated and the scanning of the Raw glass is always the first step of the Machining process by the CNC-controlled Spectacle lens edging machine. This is while scanning The raw glass cannot be shaped.
  • the invention is based on the problem of a method for Determine the course of the facets on the edge of lenses to be shaped and to control the Form processing according to the determined facet course create with which the exploitation of a CNC-controlled Eyeglass lens molding machine and the accuracy of the Increase facet course and simplify operation.
  • the invention is based on the consideration that for the lens processing machine Dead times should be avoided and therefore they should only carry out machining operations to achieve the highest level of utilization while all for performing the Processing steps required preparations outside the machine but in tight Connection to the machine should expire. Accordingly, all measurements that require a special additional step outside of Spectacle lens processing machine performed. Functions only, the processing steps required anyway connect, are in the Eyeglass lens molding machine performed without the Extend dead times. This includes measuring the thickness d of the Raw glass that can be carried out in the machine, if that Raw glass is clamped in the spectacle lens holding shaft because the Movement of the spectacle lens holding shaft during clamping to measure the Can use thickness d of the raw glass.
  • the computer can, for example, the spatial course of a suitable roof facet on the peripheral edge between the front and calculate the rear edge curve of the lens by on the one hand the personal, optometric data of the Spectacle wearer like diopter number, the axis position of a cylindrical or prismatic cut, the location of a near part and the decentration values of the given outline shape with reference entered on the optical axis of the raw glass and the thickness d of a raw glass as well as the front and rear edge curve of the Eyeglass lenses according to the shape data of the eyeglass frame opening or the form disk, which is also in the form of a data set in the calculator can be entered in one of the Spectacle lens processing machine separate measuring device are determined and transmitted to the computer, whereupon the Calculator from this the spatial course of a suitable roof facet calculated.
  • the calculator may also be enough to put all the values in the calculator enter, whereupon the calculator then using a suitable algorithm first the front and rear optical Surface and from it the front and rear edge curve of the Glasses from the shape data and the personal optometric data or from the shape data and the radii R1 and R2 and the entered or measured glass thickness d are calculated and then the spatial course of a suitable one Roof facet on the peripheral edge between the front and the trailing edge curve calculated, after which these values to control the Processing of optical surfaces and / or edge processing by means of the molding machine according to the shape data and to control the shaping of the facet according to the calculated spatial course of the suitable roof facet be used. It may be sufficient to use only one radius R1 or R2 as well as the glass thickness d because the second radius of the Glasses are usually known and directly in the calculator can be entered.
  • the radii R1, R2 and the thickness d or the front and rear space curve using a Laser beam measuring system or by means of a mechanical or a opto-mechanical measuring system can be measured, either as independent measuring device next to the Eyeglass lens molding machine may be present, or else into an automatic device for picking up and inserting Raw lenses integrated in the lens processing machine can be.
  • Measuring the glass thickness d can advantageously by means of a a raw glass to be shaped Eyeglass lens holding shaft in an eyeglass lens forming machine and one the delivery path of an axially displaceable half of the Spectacle lens holding shaft for measuring the thickness d of the clamped Measuring glass receiving raw glass.
  • a system for processing the peripheral edge of Eyeglass lenses have a CNC-controlled Spectacle lens edge processing machine 1 with an input keyboard 2, a flap 3 with a window, one behind the flap 3 arranged spectacle lens holding shaft 4 in which a raw lens 5 is held is that its CNC-controlled by means of a grinding wheel 6 Receives shape grinding on.
  • a calculator 7, the desktop calculator outside the spectacle lens edge grinding machine 1 is shown in however, this can also be integrated, causes shape grinding of the raw glass 5 according to the data entered for the Lens shape.
  • the input keyboard 2 can of course be outside the Spectacle lens edge processing machine 1, in particular in connection with the desktop computer 7, which also have a screen 38 to display the entered data and the like, be arranged.
  • This handling device 13 is fixed by means of a Stand 14 anchored and has one at the upper end of the stand 14 pair of arms 15 pivotable about vertical axes.
  • At the free end one of the pivotable arms 15 is a rotatable and displaceable Guide rod 16 in one with a corresponding drive provided head 21 arranged.
  • a suction line 20 leads from each of the suction devices 19 into the Head part 17 and from there via sensors, not shown, to one Vacuum tank or to a vacuum pump. A corresponding Suction line is also available for the suction device 18.
  • the head part 17 in the area of Eyeglass lens edge grinder 1, box 8 and one opto-electronic detection system 23 for spectacle lenses bring.
  • the opto-electronic detection system 23 has one Housing 30 with an upward opening 31. The Opening is surrounded by a shield 26, from which three pins 24 of a three-point support for a raw glass 25 protrude.
  • an upstanding support 32 On one side of the housing 30 is an upstanding support 32 arranged on which a pivot arm 33 is mounted.
  • This Swivel arm 33 has an axially displaceable at its free end Guide rod 34 with a flexible head 35 on her free end on.
  • This flexible head 35 can be Swiveling the swivel arm 33 to above the raw glass 25 pivot.
  • By lowering the guide rod 34 comes the soft elastic head 35 for contact with the raw glass 25 and holds this on the three-point pad 24.
  • a lighting 37 for a Oblique lighting of the raw glass 25 ensures.
  • One is not in the housing 30 below the opening 31 CCD camera shown arranged an electronic Image processing and evaluation system in a control unit 36 and with the control device 22 of the handling device 13 connected is.
  • the control device 36 can also be in the computer 7 be integrated.
  • the base plate 41st has, on which a turntable 42 is arranged.
  • This Rotary table 42 is with a suction cup for holding one side Raw glass 51 provided.
  • Protective walls 43 are around the base plate 41 arranged, the work space above the base plate 41st to lock.
  • a holding head 50 On a side attached to the base plate 41 Stand 44 is a holding head 50 which is axially movable telescopic arm 46 carries.
  • a guide 47 On the free arm of the Telescopic arm 46 is arranged a guide 47, one in it lifting and lowering spindle 48 carries.
  • a laser beam source 49 At the lower end of the spindle 48 there is a laser beam source 49, of which a measuring beam 100 emanates.
  • the measuring device shown in Fig. 2 can also the front and rear space curve of the lens accordingly measure the shape of the eyeglass frame opening or the shaped disc, when the movement of the computer 7 via the control device 45 Telescopic arm 46 while rotating the turntable 43 so is controlled that the measuring beam 100 the surface of the raw glass 51 leaves according to the shape of the lens.
  • laser beam measuring device shown can also use a mechanical or opto-mechanical measuring system that performs the measurements in the top of the raw glass.
  • the raw glass 51 is inserted into the Measuring device inserted and removed from this and leaves closing in the opto-electronic detection system 23 insert or can directly into the lens holding shaft 4 Spectacle lens processing machine 1 can be used.
  • the computer 7 calculates on the basis of the measurement data and the input Data referring to the personal optometric data of the Glasses wearer the shape of the glasses frame opening or Obtain a shaped disc, the spatial course of a suitable Roof facet on the peripheral edge of the lens between the front and rear edge curves and controls editing of the raw glass 5 according to these values. This will start with the raw glass 5 into the shape according to the shape data of the Eyeglass frame opening or the molded disc and is then the roof facet on the peripheral edge between the front and rear edge curve processed so that they the Demands for an aesthetically appealing arrangement of the Eyeglass lenses in the selected eyeglass frame corresponds to it inserting the molded lens into the selected glasses frame allows without difficulty.
  • the lens processing machine 1 Since the lens processing machine 1 only the Machining operations, however, no measuring operations that lead additional dead times, has to be carried out Increase the degree of utilization of the machine. Operation of the Spectacle lens edge processing machine 1 is very simplified because only the available personal optometric data of the Glasses wearer must be entered into the alphanumeric keyboard 2, while the further process by the computer 7 automatically is controlled.
  • the opto-electronic detection system 23 with its electronic image processing and evaluation system 36 contributes to simplified handling and for precise work of the Eyeglass lens edge grinding machine 1 because the image processing and Evaluation system 36 so accurate data for the control of the Handling device 13 provides that raw glasses in the CNC controlled spectacle lens edge processing machine 1 extreme can be edited exactly and without rework in that Have the spectacle frame inserted, according to the data of the spectacle lens was ground.
  • the center of the eyeglass openings in the eyeglass frame can be either from the CNC control of the lens edge grinding machine 1 take into account arithmetically, or the handling device 13 sets not only a raw glass in the spectacle lens edge grinding machine 1 angularly with respect to the position of the axis of a cylindrical or prismatic cut or the location of a near part, but also still offset by the decentration values, so that a conversion the data of the lens shape taking into account the Decentration values are not required.
  • CNC-controlled Glasses edge processing machine 1 can next to a machine for CNC controlled processing of optical surfaces be set up with the same data to edit the optical surfaces through the computer 7 CNC controlled performed, wherein the handling device 13 can serve the automatic transfer of the raw glass between the Spectacle lens edge processing machine and the not shown Surface processing machine.

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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)

Description

Die Erfindung betrifft ein Verfahren zum Ermitteln des Facettenverlaufs auf dem Rand von formzubearbeitenden Brillengläsern und zum Steuern des Formbearbeitens entsprechend dem ermittelten Facettenverlauf.The invention relates to a method for Determine the course of the facets on the edge of lenses to be shaped and to control the Shape processing according to the determined facet course.

Der Facettenverlauf auf dem Rand von formzubearbeitenden Brillengläsern soll in der Weise bestimmt werden, daß sich das formbearbeitete Brillenglas ohne Nacharbeit in ein entsprechendes, ausgewähltes Brillengestell einsetzen läßt und soll aus ästhetischen Gründen auf dem Umfangsrand des formgeschliffenen Brillenglases möglichst überall den gleichen Abstand von der Vorderkante aufweisen, auch wenn das Brillenglas eine von der kreisrunden Form stark abweichende Gestalt hat, um bezüglich des Brillengestells nicht unterschiedlich weit nach vorne überzustehen.The course of the facets on the edge of those to be machined Eyeglass lenses should be determined in such a way that shape-processed glasses without rework in a corresponding selected glasses frame can and should be used aesthetic reasons on the circumferential edge of the ground Eyeglass lenses the same distance from wherever possible Have front edge, even if the lens is one of the circular shape has a very different shape to the Glasses frame does not differ in the forward direction to face.

Beim CNC-gesteuerten Formbearbeiten, insbesondere Bearbeiten der optischen Oberflächen und dem nachfolgenden Formschleifen des Umfangsrandes und der Dachfacette eines Brillenglases liegen die Form des Brillenglases und die persönlichen optometrischen Daten des Brillenträgers in Form einer Datenmenge vor, mit denen sich eine Brillenglasformbearbeitungsmaschine so steuern läßt, daß ein Rohglas entsprechend den persönlichen optometrischen Daten des Brillenträgers hinsichtlich der optischen Oberflächen sowie entsprechend der Form des ausgewählten Brillengestells randbearbeitet und die Dachfacette so auf den Umfangsrand des formbearbeiteten Brillenglases gelegt wird, daß sie auf dem gesamten Umfang auf dem Umfangsrand verläuft und beispielsweise einen bestimmten Abstand zur Vorderkante des formbearbeiteten Brillenglases einhält.When CNC-controlled mold machining, especially machining the optical surfaces and the subsequent shaping of the The peripheral edge and the roof facet of a lens are the Shape of the lens and personal optometric data of the glasses wearer in the form of a quantity of data with which can control a lens molding machine so that a Raw glass according to the personal optometric data of the Glasses wearer with regard to the optical surfaces as well according to the shape of the selected frame edged and the roof facet so on the peripheral edge of the molded eyeglass is placed on the entire circumference runs on the circumferential edge and for example a certain distance from the front edge of the machined Observes glasses.

Die die Form des Brillengestells betreffenden Daten können in Form einer vom Brillengestellhersteller bereitgestellten Datenmenge vorliegen oder dadurch gewonnen werden, daß das Brillengestell in eine Vorrichtung zum Abtasten der Facettennut eingesetzt und die Datenmenge in dreidimensionaler Form aufgenommen werden. Hierbei ist zu beachten, daß die Facettennut in einem Brillengestell aufgrund von Herstellungstoleranzen oder Formabweichungen nicht zwangsläufig auf einer Kugelfläche liegen muß.The data relating to the shape of the eyeglass frame can be in the form a quantity of data provided by the eyeglass frame manufacturer are present or can be obtained in that the glasses frame in a device for scanning the facet groove used and the Amount of data can be recorded in three-dimensional form. in this connection it should be noted that the faceted groove in a spectacle frame due to manufacturing tolerances or shape deviations must necessarily lie on a spherical surface.

Eine Vorrichtung zum dreidimensionalen Abtasten von Brillengestellen ist im deutschen Gebrauchsmuster 86 08 201 U1 der Anmelderin beschrieben.A device for three-dimensional scanning of Eyeglass frames is the German utility model 86 08 201 U1 Applicant described.

In der deutschen Offenlegungsschrift DE 34 10 040 A1 ist des weiteren eine CNC-gesteuerte Brillenglasrandschleifmaschine beschrieben, bei der die Außenoberfläche und die Innenoberfläche eines in die Brillenglasrandschleifmaschine eingespannten, hinsichtlich der optischen Oberflächen bereits fertig bearbeiteten, kreisrunden Rohglases auf einer der Brillenglasform entsprechenden Kurve durch zwei federnd gelagerte, stiftförmige Fühler abgetastet wird, die ständig unmittelbar an dem Glas anliegen und deren axiale Stellung Potentiometern mitgeteilt wird, wobei die durch diese Potentiometer ermittelten Werte und Daten einem Rechner oder einem Datenspeicher weitergegeben werden, der daraus den räumlichen Verlauf der Vorderkante und Hinterkante des Brillenglases sowie die jeweilige Glasdicke berechnet und aus einer gespeicherten Damenmenge von verschiedenen Dachfacetten diejenige Dachfacette auswählt, die sich auf dem Umfangsrand des formgeschliffenen Brillenglases anbringen läßt, ohne den Umfangsrand an irgendeiner Stelle zu verlassen. Die beschriebene Meßvorrichtung ist in die CNC-gesteuerte Brillenglasrandschleifmaschine integriert und das Abtasten des Rohglases erfolgt stets als erster Schritt des Bearbeitungsvorganges durch die CNC-gesteuerte Brillenglasrandschleifmaschine. Während des Abtastens ist das Formbearbeiten des Rohglases nicht möglich.In the German patent application DE 34 10 040 A1 the another a CNC-controlled eyeglass lens grinding machine described in which the outer surface and the inner surface one clamped in the lens grinder, already finished with regard to the optical surfaces machined, circular raw glass on one of the glasses shape corresponding curve through two spring-loaded, pin-shaped Sensor is scanned, which is constantly directly on the glass apply and the axial position of which is communicated to potentiometers, the values and data determined by these potentiometers be passed on to a computer or a data storage device which from this the spatial course of the leading and trailing edge of the Eyeglass lenses and the respective lens thickness calculated and from a stored amount of women from different roof facets selects the roof facet that is located on the circumferential edge of the can be attached to shape-cut glasses without the Leaving the peripheral edge at any point. The one described Measuring device is in the CNC controlled Glasses edge grinding machine integrated and the scanning of the Raw glass is always the first step of the Machining process by the CNC-controlled Spectacle lens edging machine. This is while scanning The raw glass cannot be shaped.

Beim Vermessen eines Brillenglases nach einem in der deutschen Patentschrift DE 38 42 601 C2 der Anmelderin beschriebenen Verfahren, bei dem die Vorder- bzw. die Hinterkante eines vorgeschliffenen Brillenglases während des Bearbeitungsvorganges durch einen Tastkopf vermessen wird, ist zwar kein zusätzlicher Zeitaufwand beim Vermessen des Brillenglases erforderlich, jedoch gehen Abweichungen des Brillenglases von der sphärischen Form in die Messung ein. Derartige Abweichungen können sich aus einem den sphärischen Schliff überlagerten prismatischen oder zylindrischen Schliff sowie aus der Anordnung eines Nahteils ergeben. Auch die Dezentration der optischen Achse des Brillenglases mit Bezug auf die geometrische Achse des Brillenglases bzw. den geometrischen Mittelpunkt des Brillengestells spielt eine Rolle.When measuring a lens after one in the German Patent specification DE 38 42 601 C2 of the applicant described Procedure in which the leading or trailing edge of a pre-ground glasses during the machining process is measured by a probe, is not an additional one Time required for measuring the spectacle lens required, however deviations of the lens from the spherical shape the measurement. Such deviations can arise from a spherical cut superimposed on prismatic or cylindrical Cut and result from the arrangement of a close part. Also the Decentration of the optical axis of the lens with reference to the geometric axis of the lens or the geometric The center of the frame plays a role.

Der Erfindung liegt das Problem zugrunde, ein Verfahren zum Ermitteln des Facettenverlaufs auf dem Rand von formzubearbeitenden Brillengläsern und zum Steuern des Formbearbeitens entsprechend dem ermittelten Facettenverlauf zu schaffen, mit dem sich die Ausnutzung einer CNC-gesteuerten Brillenglasformbearbeitungsmaschine und die Genauigkeit des Facettenverlaufs steigern und die Bedienung vereinfachen läßt.The invention is based on the problem of a method for Determine the course of the facets on the edge of lenses to be shaped and to control the Form processing according to the determined facet course create with which the exploitation of a CNC-controlled Eyeglass lens molding machine and the accuracy of the Increase facet course and simplify operation.

Ausgehend von dieser Aufgabenstellung wird ein Verfahren gemäß 1 oder 2 vorgeschlagen. Die Merkmale der Unteransprüche dienen der Verbesserung und Weiterbildung der Merkmale der Ansprüche 1 und 2. Based on this task, a procedure according to 1 or 2 suggested. The features of the subclaims serve Improvement and development of the features of claims 1 and 2.

Die Erfindung geht von der Überlegung aus, daß für die Brillenglasformbearbeitungsmaschine Totzeiten vermieden werden sollen und sie daher nur Bearbeitungsvorgänge durchführen soll, um den höchsten Ausnutzungsgrad zu erreichen, während alle für das Durchführen der Bearbeitungsschritte erforderlichen Vorbereitungen außerhalb der Maschine aber in enger Verbindung mit der Maschine ablaufen sollen. Dementsprechend werden sämtliche Messungen, die einen besonderen zusätzlichen Schritt erfordern, außerhalb der Brillenglasformbearbeitungsmaschine durchgeführt. Nur Funktionen, die sich mit ohnehin erforderlichen Bearbeitungsschritten verbinden lassen, werden in der Brillenglasformbearbeitungsmaschine durchgeführt, ohne die Totzeiten zu verlängern. Hierzu gehört das Messen der Dicke d des Rohglases, das sich in der Maschine durchführen läßt, wenn das Rohglas in der Brillenglashaltewelle eingespannt wird, da sich die Bewegung der Brillenglashaltewelle beim Spannen zum Messen der Dicke d des Rohglases verwenden läßt.The invention is based on the consideration that for the lens processing machine Dead times should be avoided and therefore they should only carry out machining operations to achieve the highest level of utilization while all for performing the Processing steps required preparations outside the machine but in tight Connection to the machine should expire. Accordingly, all measurements that require a special additional step outside of Spectacle lens processing machine performed. Functions only, the processing steps required anyway connect, are in the Eyeglass lens molding machine performed without the Extend dead times. This includes measuring the thickness d of the Raw glass that can be carried out in the machine, if that Raw glass is clamped in the spectacle lens holding shaft because the Movement of the spectacle lens holding shaft during clamping to measure the Can use thickness d of the raw glass.

Des weiteren wird die Leistungsfähigkeit des zur Steuerung der Brillenglasformbearbeitungsmaschine verwendeten Rechners ausgenutzt, um alle die Werte unter Berücksichtigung der eingegebenen und gemessenen Daten durchzuführen, die sich programmieren und mit großer Rechnergeschwindigkeit durchführen lassen. Ein zusätzlicher Großrechner oder Zentralrechner ist hierfür nicht erforderlich, da ein entsprechend programmierter Rechner, der sich auch in die Brillenglasformbearbeitungsmaschine integrieren und für die CNC-Steuerung verwenden läßt, völlig ausreicht.Furthermore, the performance of the to control the Spectacle lens processing machine used exploited to take into account all the values entered and measured data to perform itself program and execute at high computer speed to let. An additional mainframe or central computer is not necessary for this, as a correspondingly programmed Calculator that can also be used in the lens processing machine integrate and use for the CNC control, completely sufficient.

Der Rechner kann beispielsweise den räumlichen Verlauf einer geeigneten Dachfacette auf dem Umfangsrand zwischen der vorderen und hinteren Randkurve des Brillenglases berechnen, indem einerseits die persönlichen, optometrischen Daten des Brillenträgers wie Dioptriezahl, die Achsenlage eines zylindrischen oder prismatischen Schliffs, die Lage eines Nahteils und die Dezentrationswerte der vorgegebenen Umrißgestalt mit Bezug auf die optische Achse des Rohglases eingegeben sowie die Dicke d eines Rohglases sowie die vordere und hintere Randkurve des Brillenglases entsprechend den Formdaten der Brillengestellöffnung oder der Formscheibe, die ebenfalls in Form einer Datenmenge in den Rechner eingegeben werden, in einer von der Brillenglasformbearbeitungsmaschine getrennten Meßvorrichtung ermittelt und an den Rechner übermittelt werden, woraufhin der Rechner daraus den räumlichen Verlauf einer geeigneten Dachfacette berechnet. Oder es werden nur der Radius R1 der Vorderfläche und/oder der Radius R2 der Rückfläche und die Dicke d des Rohglases in einer von der Brillenglasformbearbeitungsmaschine getrennten Meßvorrichtung gemessen und zusammen mit den übrigen Daten zum Berechnen des räumlichen Verlaufs einer geeigneten Dachfacette verwendet.The computer can, for example, the spatial course of a suitable roof facet on the peripheral edge between the front and calculate the rear edge curve of the lens by on the one hand the personal, optometric data of the Spectacle wearer like diopter number, the axis position of a cylindrical or prismatic cut, the location of a near part and the decentration values of the given outline shape with reference entered on the optical axis of the raw glass and the thickness d of a raw glass as well as the front and rear edge curve of the Eyeglass lenses according to the shape data of the eyeglass frame opening or the form disk, which is also in the form of a data set in the calculator can be entered in one of the Spectacle lens processing machine separate measuring device are determined and transmitted to the computer, whereupon the Calculator from this the spatial course of a suitable roof facet calculated. Or it will just be the radius R1 of the front surface and / or the radius R2 of the back surface and the thickness d of the Raw glass in one of the lens processing machine separate measuring device measured and together with the rest Data to calculate the spatial course of a suitable one Roof facet used.

Schließlich kann es auch genügen, alle Werte in den Rechner einzugeben, woraufhin der Rechner dann unter Verwendung eines geeigneten Algorithmus zunächst die vordere und hintere optische Oberfläche und daraus die vordere und hintere Randkurve des Brillenglases aus den Formdaten und den persönlichen optometrischen Daten oder aus den Formdaten und den Radien R1 und R2 sowie der eingegebenen oder gemessenen Glasdicke d berechnet und daraus dann den räumlichen Verlauf einer geeigneten Dachfacette auf dem Umfangsrand zwischen der vorderen und der hinteren Randkurve berechnet, wonach diese Werte zum Steuern der Bearbeitung der optischen Oberflächen und/oder der Randbearbeitung mittels der Formbearbeitungsmaschine entsprechend den Formdaten und zum Steuern der Formbearbeitung der Facette entsprechend dem berechneten räumlichen Verlauf der geeigneten Dachfacette verwendet werden. Es kann dabei genügen, nur den einen Radius R1 oder R2 sowie die Glasdicke d zu messen, da der zweite Radius des Brillenglases in der Regel bekannt ist und direkt in den Rechner eingegeben werden kann.Finally, it may also be enough to put all the values in the calculator enter, whereupon the calculator then using a suitable algorithm first the front and rear optical Surface and from it the front and rear edge curve of the Glasses from the shape data and the personal optometric data or from the shape data and the radii R1 and R2 and the entered or measured glass thickness d are calculated and then the spatial course of a suitable one Roof facet on the peripheral edge between the front and the trailing edge curve calculated, after which these values to control the Processing of optical surfaces and / or edge processing by means of the molding machine according to the shape data and to control the shaping of the facet according to the calculated spatial course of the suitable roof facet be used. It may be sufficient to use only one radius R1 or R2 as well as the glass thickness d because the second radius of the Glasses are usually known and directly in the calculator can be entered.

Vorteilhafterweise können die Radien R1, R2 und die Dicke d oder die vordere und hintere Raumkurve mittels eines Laserstrahlmeßsystems oder mittels eines mechanischen oder eines opto-mechanischen Meßsystems gemessen werden, das entweder als eigenständige Meßvorrichtung neben der Brillenglasformbearbeitungsmaschine vorhanden sein kann, oder aber in eine automatische Vorrichtung zum Aufnehmen und Einsetzen von Rohgläsern in die Brillenglasformbearbeitungsmaschine integriert sein kann.Advantageously, the radii R1, R2 and the thickness d or the front and rear space curve using a Laser beam measuring system or by means of a mechanical or a opto-mechanical measuring system can be measured, either as independent measuring device next to the Eyeglass lens molding machine may be present, or else into an automatic device for picking up and inserting Raw lenses integrated in the lens processing machine can be.

Das Messen der Glasdicke d kann vorteilhafter weise mittels einer ein formzubearbeitendes Rohglas einspannenden Brillenglashaltewelle in einer Brillenglasformbearbeitungsmaschine und einer den Zustellweg einer axial verschiebbaren Hälfte der Brillenglashaltewelle zum Messen der Dicke d des eingespannten Rohglases aufnehmenden Meßvorrichtung erfolgen. Measuring the glass thickness d can advantageously by means of a a raw glass to be shaped Eyeglass lens holding shaft in an eyeglass lens forming machine and one the delivery path of an axially displaceable half of the Spectacle lens holding shaft for measuring the thickness d of the clamped Measuring glass receiving raw glass.

Die Erfindung wird nachstehend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels des näheren erläutert. In der Zeichnung zeigen:

Fig. 1
eine schematische, perspektivische Ansicht einer Anlage zum CNC-gesteuerten Formbearbeiten von Brillengläsern und
Fig. 2
eine schematische, perspektivische Darstellung einer Meßvorrichtung zum Messen des Radius R1 der Vorderfläche und/oder des Radius R2 der Rückfläche und der Dicke d des Rohglases sowie ggf. der vorderen und hinteren Randkurve des Brillenglases entsprechend den Formdaten der Brillengestellöffnung oder der Formscheibe.
The invention is explained below with reference to an embodiment shown in the drawing. The drawing shows:
Fig. 1
is a schematic, perspective view of a system for CNC-controlled molding of glasses and
Fig. 2
is a schematic, perspective view of a measuring device for measuring the radius R1 of the front surface and / or the radius R2 of the rear surface and the thickness d of the raw lens and possibly the front and rear edge curve of the lens according to the shape data of the eyeglass frame opening or the shaped disc.

Eine Anlage zum Bearbeiten des Umfangsrandes von Brillengläsern weist eine CNC-gesteuerte Brillenglasrandbearbeitungsmaschine 1 mit einer Eingabetastatur 2, einer Klappe 3 mit einem Fenster, einer hinter der Klappe 3 angeordneten Brillenglashaltewelle 4 in der ein Rohglas 5 gehalten ist, das mittels einer Schleifscheibe 6 CNC-gesteuert seinen Formschliff erhält, auf. Ein Rechner 7, der als Tischrechner außerhalb der Brillenglasrandschleifmaschine 1 dargestellt ist, in diese jedoch auch integriert sein kann, bewirkt das Formschleifen des Rohglases 5 entsprechend den eingebenen Daten für die Brillenglasform.A system for processing the peripheral edge of Eyeglass lenses have a CNC-controlled Spectacle lens edge processing machine 1 with an input keyboard 2, a flap 3 with a window, one behind the flap 3 arranged spectacle lens holding shaft 4 in which a raw lens 5 is held is that its CNC-controlled by means of a grinding wheel 6 Receives shape grinding on. A calculator 7, the desktop calculator outside the spectacle lens edge grinding machine 1 is shown in however, this can also be integrated, causes shape grinding of the raw glass 5 according to the data entered for the Lens shape.

Die Eingabetastatur 2 kann selbstverständlich außerhalb der Brillenglasrandbearbeitungsmaschine 1, insbesondere in Verbindung mit dem Tischrechner 7, der auch einen Bildschirm 38 aufweisen kann, um die eingegebenen Daten und dergleichen anzuzeigen, angeordnet sein.The input keyboard 2 can of course be outside the Spectacle lens edge processing machine 1, in particular in connection with the desktop computer 7, which also have a screen 38 to display the entered data and the like, be arranged.

Ein Kasten 8 mit zwei Auflagen 9 für flachliegende Rohgläser, nämlich einem linken Rohglas 10 und einem rechten Rohglas 11, läßt sich mittels einer nicht dargestellten Transportvorrichtung auf Führungsschienen 12 in den Bereich eines Handhabungsgeräts 13 bringen. Dieses Handhabungsgerät 13 ist mittels eines ortsfesten Ständers 14 verankert und weist ein am oberen Ende des Ständers 14 um senkrechte Achsen schwenkbares Armpaar 15 auf. Am freien Ende eines der schwenkbaren Arme 15 ist eine dreh- und verschiebbare Führungsstange 16 in einem mit einem entsprechenden Antrieb versehenen Kopfteil 21 angeordnet. Am unteren Ende der Führungsstange 16 befindet sich ein weiteres Kopfteil 17, das als Träger für einen senkrechten, bezüglich des Kopfteils 17 feststehenden Sauger 18 und für sechs um eine waagerechte Achse drehbare, an einem Ringsegment halbmondförmig angeordnete Sauger 19 dient. Von jedem der Sauger 19 führt eine Saugleitung 20 in das Kopfteil 17 und von dort über nicht dargestellte Sensoren zu einem Unterdruckbehälter oder zu einer Vakuumpumpe. Eine entsprechende Saugleitung ist auch für den Sauger 18 vorhanden. A box 8 with two supports 9 for flat raw glass, namely a left raw glass 10 and a right raw glass 11, leaves by means of a transport device, not shown Guide rails 12 in the area of a handling device 13 bring. This handling device 13 is fixed by means of a Stand 14 anchored and has one at the upper end of the stand 14 pair of arms 15 pivotable about vertical axes. At the free end one of the pivotable arms 15 is a rotatable and displaceable Guide rod 16 in one with a corresponding drive provided head 21 arranged. At the bottom of the Guide rod 16 is another head part 17, which as Support for a vertical, with respect to the head part 17th fixed suction cups 18 and for six around a horizontal axis rotatable suction cups arranged in a crescent shape on a ring segment 19 serves. A suction line 20 leads from each of the suction devices 19 into the Head part 17 and from there via sensors, not shown, to one Vacuum tank or to a vacuum pump. A corresponding Suction line is also available for the suction device 18.

Mittels einer Steuereinrichtung 22, die mit dem Rechner 7 verbunden ist und auch als Teil des Rechners 7 ausgebildet sein kann, läßt sich das Kopfteil 17 in den Bereich der Brillenglasrandschleifmaschine 1, des Kastens 8 und eines opto-elektronischen Erkennungssystems 23 für Brillengläser bringen. Das opto-elektronische Erkennungssystem 23 weist ein Gehäuse 30 mit einer nach oben gerichteten Öffnung 31 auf. Die Öffnung ist von einer Abschirmung 26 umgeben, aus der drei Stifte 24 einer Drei-Punkt-Auflage für ein Rohglas 25 herausragen.By means of a control device 22, which is connected to the computer 7 is connected and also be formed as part of the computer 7 can, the head part 17 in the area of Eyeglass lens edge grinder 1, box 8 and one opto-electronic detection system 23 for spectacle lenses bring. The opto-electronic detection system 23 has one Housing 30 with an upward opening 31. The Opening is surrounded by a shield 26, from which three pins 24 of a three-point support for a raw glass 25 protrude.

An einer Seite des Gehäuses 30 ist ein aufragender Träger 32 angeordnet, an dem ein Schwenkarm 33 gelagert ist. Dieser Schwenkarm 33 weist an seinem freien Ende eine axialverschiebbaren Führungsstange 34 mit einem weichelastischen Kopf 35 an ihrem freien Ende auf. Dieser weichelastische Kopf 35 läßt sich durch Schwenken des Schwenkarms 33 bis oberhalb des Rohglases 25 verschwenken. Durch Herabsenken der Führungsstange 34 kommt der weichelastische Kopf 35 zur Anlage auf das Rohglas 25 und hält dieses auf der Drei-Punkt-Auflage 24 fest. Am Träger 32 ist des weiteren eine Beleuchtung 37 befestigt, die für eine Schräglichtbeleuchtung des Rohglases 25 sorgt.On one side of the housing 30 is an upstanding support 32 arranged on which a pivot arm 33 is mounted. This Swivel arm 33 has an axially displaceable at its free end Guide rod 34 with a flexible head 35 on her free end on. This flexible head 35 can be Swiveling the swivel arm 33 to above the raw glass 25 pivot. By lowering the guide rod 34 comes the soft elastic head 35 for contact with the raw glass 25 and holds this on the three-point pad 24. On the carrier 32 is the further attached a lighting 37 for a Oblique lighting of the raw glass 25 ensures.

In dem Gehäuse 30 unterhalb der Öffnung 31 ist eine nicht dargestellte CCD-Kamera angeordnet, die ein elektronisches Bildverarbeitungs- und Auswertesystem in einer Steuereinheit 36 aufweist und mit der Steuereinrichtung 22 des Handhabungsgeräts 13 verbunden ist. Auch die Steuereinrichtung 36 kann in den Rechner 7 integriert sein.One is not in the housing 30 below the opening 31 CCD camera shown arranged an electronic Image processing and evaluation system in a control unit 36 and with the control device 22 of the handling device 13 connected is. The control device 36 can also be in the computer 7 be integrated.

Im Arbeitsbereich des Handhabungsgeräts 13 ist des weiteren eine Laserstrahlmeßvorrichtung angeordnet, die eine Grundplatte 41 aufweist, auf der ein Drehtisch 42 angeordnet ist. Dieser Drehtisch 42 ist mit einem Sauger zum einseitigen Halten eines Rohglases 51 versehen. Um die Grundplatte 41 sind Schutzwände 43 angeordnet, die den Arbeitsraum oberhalb der Grundplatte 41 abschließen. An einem seitlich an der Grundplatte 41 befestigten Ständer 44 ist ein Haltekopf 50 angeordnet, der einen axial verschiebbaren Teleskoparm 46 trägt. Am freien Arm des Teleskoparms 46 ist eine Führung 47 angeordnet, die eine darin heb- und senkbare Spindel 48 trägt. Am unteren Ende der Spindel 48 befindet sich eine Laserstrahlquelle 49, von der ein Meßstrahl 100 ausgeht.In the working area of the handling device 13 there is also one Laser beam measuring device arranged, the base plate 41st has, on which a turntable 42 is arranged. This Rotary table 42 is with a suction cup for holding one side Raw glass 51 provided. Protective walls 43 are around the base plate 41 arranged, the work space above the base plate 41st to lock. On a side attached to the base plate 41 Stand 44 is a holding head 50 which is axially movable telescopic arm 46 carries. On the free arm of the Telescopic arm 46 is arranged a guide 47, one in it lifting and lowering spindle 48 carries. At the lower end of the spindle 48 there is a laser beam source 49, of which a measuring beam 100 emanates.

Um den Radius R1 oder R2 der der Laserstrahlquelle 49 zugewandten Oberfläche des Rohglases 51 zu messen, genügt es, die Laserstrahlquelle 49 durch axiales Verschieben des Teleskoparms 46 einmal quer über das Rohglas 51 zu verfahren und dabei die über der Oberfläche gemessenen Höhenunterschiede aufzunehmen. Hieraus berechnet der Rechner 7 den Radius R1 bzw. R2 je nachdem, welche Seite des Rohglases 51 zur Laserstrahlquelle 49 gerichtet ist. Werden beide Radien R1 und R2 auf diese Weise durch Umschlag gemessen, ergibt sich daraus auch direkt die jeweilige Rohglasdicke d im optischen Mittelpunkt. Around the radius R1 or R2 of the laser beam source 49 facing To measure the surface of the raw glass 51, it is sufficient to Laser beam source 49 by axially displacing the telescopic arm 46 to move once across the raw glass 51 and thereby the record differences in height measured on the surface. From this The computer 7 calculates the radius R1 or R2 depending on which one Side of the raw glass 51 is directed to the laser beam source 49. Both radii R1 and R2 are turned over in this way measured, the respective results directly from this Raw glass thickness d in the optical center.

Mit der in Fig. 2 dargestellten Meßvorrichtung lassen sich auch die vordere und hintere Raumkurve des Brillenglases entsprechend der Form der Brillengestellöffnung oder der Formscheibe messen, wenn vom Rechner 7 über die Steuereinrichtung 45 die Bewegung des Teleskoparms 46 bei gleichzeitiger Drehung des Drehtischs 43 so gesteuert wird, daß der Meßstrahl 100 die Oberfläche des Rohglases 51 entsprechend der Form des Brillenglases abfährt.With the measuring device shown in Fig. 2 can also the front and rear space curve of the lens accordingly measure the shape of the eyeglass frame opening or the shaped disc, when the movement of the computer 7 via the control device 45 Telescopic arm 46 while rotating the turntable 43 so is controlled that the measuring beam 100 the surface of the raw glass 51 leaves according to the shape of the lens.

Statt der dargestellten Laserstrahlmeßvorrichtung läßt sich auch ein mechanisches oder opto-mechanisches Meßsystem verwenden, das die Messungen im Scheitel des Rohglases durchführt.Instead of the laser beam measuring device shown can also use a mechanical or opto-mechanical measuring system that performs the measurements in the top of the raw glass.

Das Rohglas 51 wird mittels der Handhabungsvorrichtung 13 in die Meßvorrichtung eingesetzt und wieder aus dieser entnommen und läßt sich schließend in das opto-elektronische Erkennungssystem 23 einsetzen oder kann direkt in die Brillenglashaltewelle 4 der Brillenglasbearbeitungsmaschine 1 eingesetzt werden.The raw glass 51 is inserted into the Measuring device inserted and removed from this and leaves closing in the opto-electronic detection system 23 insert or can directly into the lens holding shaft 4 Spectacle lens processing machine 1 can be used.

Der Rechner 7 berechnet anhand der Meßdaten sowie der eingegebenen Daten, die sich auf die persönlichen optometrischen Daten des Brillenträgers die Form der Brillengestellöffnung oder der Formscheibe beziehen, den räumlichen Verlauf einer geeigneten Dachfacette auf dem Umfangsrand des Brillenglases zwischen der vorderen und der hinteren Randkurve und steuert die Bearbeitung des Rohglases 5 entsprechend diesen Werten. Dabei wird zunächst das Rohglas 5 in die Form entsprechend den Formdaten der Brillengestellöffnung oder der Formscheibe gebracht und wird anschließend die Dachfacette auf den Umfangsrand zwischen der vorderen und der hinteren Randkurve so bearbeitet, daß sie den Forderungen nach einer ästhetisch ansprechenden Anordnung der Brillengläser im ausgewählten Brillengestell entspricht und dabei das Einsetzen des formbearbeiteten Brillenglases in das ausgewählte Brillengestell ohne Schwierigkeiten zuläßt.The computer 7 calculates on the basis of the measurement data and the input Data referring to the personal optometric data of the Glasses wearer the shape of the glasses frame opening or Obtain a shaped disc, the spatial course of a suitable Roof facet on the peripheral edge of the lens between the front and rear edge curves and controls editing of the raw glass 5 according to these values. This will start with the raw glass 5 into the shape according to the shape data of the Eyeglass frame opening or the molded disc and is then the roof facet on the peripheral edge between the front and rear edge curve processed so that they the Demands for an aesthetically appealing arrangement of the Eyeglass lenses in the selected eyeglass frame corresponds to it inserting the molded lens into the selected glasses frame allows without difficulty.

Da die Brillenglasrandbearbeitungsmaschine 1 nur die Bearbeitungsvorgänge, jedoch keine Meßvorgänge, die zu zusätzlichen Totzeiten führen, durchzuführen hat, läßt sich der Ausnutzungsgrad der Maschine steigern. Die Bedienung der Brillenglasrandbearbeitungsmaschine 1 ist sehr vereinfacht, da nur die verfügbaren persönlichen optometrischen Daten des Brillenträgers in die alphanumerische Tastatur 2 einzugeben sind, während der weitere Ablauf durch den Rechner 7 automatisch gesteuert wird.Since the lens processing machine 1 only the Machining operations, however, no measuring operations that lead additional dead times, has to be carried out Increase the degree of utilization of the machine. Operation of the Spectacle lens edge processing machine 1 is very simplified because only the available personal optometric data of the Glasses wearer must be entered into the alphanumeric keyboard 2, while the further process by the computer 7 automatically is controlled.

Alle eingegebenen und gemessenen Daten lassen sich anhand einer Darstellung auf dem Bildschirm 38 kontrollieren, so daß eine fehlerhafte Bedienung oder fehlerhafte Bearbeitung ausgeschlossen sind.All entered and measured data can be viewed using a Check the display on the screen 38 so that a incorrect operation or incorrect processing excluded are.

Auch das opto-elektronische Erkennungssystem 23 mit seinem elektronischen Bildverarbeitungs- und Auswertesystem 36 trägt zur vereinfachten Handhabung und zum genauen Arbeiten der Brillenglasrandschleifmaschine 1 bei, da das Bildverarbeitungsund Auswertesystem 36 so genaue Daten für die Steuerung des Handhabungsgeräts 13 liefert, daß sich Rohgläser in der CNC-gesteuerten Brillenglasrandbearbeitungsmaschine 1 äußerst genau bearbeiten lassen und sich ohne Nacharbeit in dasjenige Brillengestell einsetzen lassen, nach dessen Daten das Brillenglas formgeschliffen wurde. Die für den jeweiligen Brillenträger vom Optiker zu ermittelnden Dezentrationswerte des optischen Mittelpunkts der Brillengläser mit Bezug auf den geometrischen Mittelpunkt der Brillenglasöffnungen im Brillengestell lassen sich entweder von der CNC-Steuerung der Brillenglasrandschleifmaschine 1 rechnerisch berücksichtigen, oder das Handhabungsgerät 13 setzt ein Rohglas in die Brillenglasrandschleifmaschine 1 nicht nur winkelgenau bezüglich der Lage der Achse eines zylindrischen oder prismatischen Schliffs bzw. der Lage eines Nahteils, sondern auch noch um die Dezentrationswerte versetzt ein, so daß ein Umrechnen der Daten der Brillenglasform unter Berücksichtigung der Dezentrationswerte nicht erforderlich ist.The opto-electronic detection system 23 with its electronic image processing and evaluation system 36 contributes to simplified handling and for precise work of the Eyeglass lens edge grinding machine 1 because the image processing and Evaluation system 36 so accurate data for the control of the Handling device 13 provides that raw glasses in the CNC controlled spectacle lens edge processing machine 1 extreme can be edited exactly and without rework in that Have the spectacle frame inserted, according to the data of the spectacle lens was ground. The for the respective glasses wearer from Optician to determine decentration values of the optical Center of the lenses with reference to the geometric The center of the eyeglass openings in the eyeglass frame can be either from the CNC control of the lens edge grinding machine 1 take into account arithmetically, or the handling device 13 sets not only a raw glass in the spectacle lens edge grinding machine 1 angularly with respect to the position of the axis of a cylindrical or prismatic cut or the location of a near part, but also still offset by the decentration values, so that a conversion the data of the lens shape taking into account the Decentration values are not required.

Zusätzlich zu der dargestellten, CNC-gesteuerten Brillenglasrandbearbeitungsmaschine 1 kann daneben eine Maschine zum CNC-gesteuerten Bearbeiten der optischen Oberflächen aufgestellt sein, die mit denselben Daten das Bearbeiten der optischen Oberflächen durch den Rechner 7 CNC-gesteuert durchgeführt, wobei das Handhabungsgerät 13 dazu dienen kann, das automatische Umsetzen des Rohglases zwischen der Brillenglasrandbearbeitungsmaschine und der nicht dargestellten Oberflächenbearbeitungsmaschine vorzunehmen. In addition to the illustrated, CNC-controlled Glasses edge processing machine 1 can next to a machine for CNC controlled processing of optical surfaces be set up with the same data to edit the optical surfaces through the computer 7 CNC controlled performed, wherein the handling device 13 can serve the automatic transfer of the raw glass between the Spectacle lens edge processing machine and the not shown Surface processing machine.

Wenn das Bearbeiten der optischen Oberflächen und des Randes einschließlich der Facette in einer einheitlichen Maschine integriert ist, ist auch das Umsetzen nicht erforderlich.When editing the optical surfaces and the edge including the facet in a unified machine is integrated, the implementation is not necessary.

Claims (6)

  1. A method for determining the facet curve on the edge of spectacle lenses which are to be form-machined and for controlling the form-machining corresponding to the determined facet path, comprising the steps:
    entering the form data r (γ, z) of a spectacle-frame opening or the form data r(γ) of a forming disc into a computer of a CNC spectacle-lens form-machining unit,
    entering the personal optometric data of the spectacle wearer into the computer,
    entering the radius R1 of the front surface and the radius R2 of the rear surface and also the thickness d of the lens blank in the optical centre point or calculating the radii R1, R2 and the thickness d of the lens blank in the optical centre point from the optometric data,
    calculating the front and rear edge curves of the lens from the form data and the personal optometric data or from the form data and the radii R1 and R2 and the lens thickness d,
    calculating the spatial path of a suitable roof facet on the peripheral edge between the front and rear edge curve calculated corresponding to the entered values,
    controlling the machining of the optical surfaces and/or of the edge by means of the spectacle-lens form-machining unit corresponding to the form data, and
    controlling the form-machining of the facet corresponding to the calculated spatial path of the suitable roof facet.
  2. A method for determining the facet path on the edge of spectacle lenses which are to be form-machined and for controlling the form-machining corresponding to the determined facet path, comprising the steps:
    entering the form data r (γ, z) of a spectacle-frame opening or the form data r(γ) of a forming disc into a computer of a CNC spectacle-lens form-machining unit,
    entering the personal optometric data of the spectacle wearer into the computer,
    measuring the thickness d of a lens blank in the optical centre point and the front and rear spatial curves of the lens corresponding to the form data of the spectacle-frame opening or the forming disc in a measuring device separate from the spectacle-lens form-machining unit or
    measuring the radius R1 of the front surface and/or the radius R2 of the rear surface and the thickness d of the lens blank in the optical centre point in a measuring device separate from the spectacle-lens form-machining unit or
    measuring the thickness d of the lens blank in the optical centre point in a measuring device separate from the spectacle-lens form-machining unit or by means of a measuring device which co-operates with a lens holding shaft in the spectacle-lens form-machining unit,
    transferring the measured values into the computer,
    optionally calculating the front and rear edge curves of the lens from the form data and the personal optometric data or from the form data and the radii R1 and R2 and the lens thickness d,
    calculating the spatial path of a suitable roof facet on the peripheral edge between the front and rear edge curves which are either measured or calculated corresponding to the entered values,
    controlling the machining of the optical surfaces and/or of the edge by means of the spectacle-lens form-machining unit corresponding to the form data, and
    controlling the form-machining of the facet corresponding to the calculated spatial path of the suitable roof facet.
  3. A method according to Claim 1 or 2, characterised in that the measurement of the radii R1, R2, the thickness d or the front and rear spatial curves is effected by means of a laser-beam measuring device.
  4. A method according to Claim 1 or 2, characterised in that the measurement of the radii R1, R2 [or] the thickness d is effected by means of a mechanical or an opto-mechanical measuring system in the vertex of the lens blank.
  5. A method according to Claim 1, 2, 3 or 4, characterised in that the measurement of the radii R1, R2, the thickness d or the front and rear spatial curves is effected in an automatic device for receiving and inserting lens blanks into the spectacle-lens form-machining unit.
  6. A method according to Claim 2, characterised in that the measurement of the thickness d is effected by means of a lens holding shaft (4) which grips a lens blank (5) which is to be form-machined in a spectacle-lens form-machining unit (1) and a measuring device (39) which records the feed path of an axially displaceable half of the lens holding shaft (4) for measuring the thickness d of the clamped lens blank (5).
EP97108290A 1997-01-23 1997-05-22 Method for NC shaping of spectacle lenses Expired - Lifetime EP0855248B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19702287 1997-01-23
DE19702287A DE19702287C2 (en) 1997-01-23 1997-01-23 Method for determining the course of the facets on the edge of spectacle lenses to be processed and for controlling the processing of shapes in accordance with the determined course of the facets

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EP0855248A1 EP0855248A1 (en) 1998-07-29
EP0855248B1 true EP0855248B1 (en) 2003-10-22

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Also Published As

Publication number Publication date
EP0855248A1 (en) 1998-07-29
DE19702287A1 (en) 1998-08-06
DE19702287C2 (en) 1999-02-11
US5908348A (en) 1999-06-01
DE59710887D1 (en) 2003-11-27

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