EP2193880A2 - Method for processing and calculating an optical lens designed as a semi-finished product - Google Patents

Method for processing and calculating an optical lens designed as a semi-finished product Download PDF

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Publication number
EP2193880A2
EP2193880A2 EP09178032A EP09178032A EP2193880A2 EP 2193880 A2 EP2193880 A2 EP 2193880A2 EP 09178032 A EP09178032 A EP 09178032A EP 09178032 A EP09178032 A EP 09178032A EP 2193880 A2 EP2193880 A2 EP 2193880A2
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EP
European Patent Office
Prior art keywords
shape
semi
lens
finished product
actual
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EP09178032A
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German (de)
French (fr)
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EP2193880B1 (en
EP2193880A3 (en
Inventor
Gunter Schneider
Helwig Buchenauer
Stephan Huttenhuis
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Schneider GmbH and Co KG
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Schneider GmbH and Co KG
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Publication of EP2193880A3 publication Critical patent/EP2193880A3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • 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

Definitions

  • the invention relates to a method for processing and calculating an optical lens formed as a semi-finished product with a prefabricated shape of a first side and a second side to be machined, in which in order to obtain the desired optical property of the finished lens, a desired shape of a surface of is calculated as a method step, wherein prior to the calculation of the target shape of the surface of the second side an actual shape of the surface of the first side detected by measuring means or by a measuring instrument and the actual shape of the surface of the first page in the calculation of the target shape of the surface of the second side flows.
  • the first side or the second side may be the front side or the back side of the lens.
  • a lens or lens usually has a front and a back, both of which are bounded by an edge.
  • the edge has a rim edge, which is usually designed in the shape of a frame.
  • the optical effect of the front and the optical effect of the back overlap and form the overall optical effect or optical property.
  • the front side or the back side form the first side while the back side or the front side forms the opposite second side.
  • a lens semi-finished product whose first side is prefabricated, ie the shape of the surface of the first side is made according to a target shape.
  • it is a molded part, wherein the surface of the first page corresponds to a shape of the shell mold.
  • the shell mold has in this case the form to be molded off. Due to the material properties of the plastic used as well as due to the cooling process after spraying arise deviations between the desired shape of the tool and the actually obtained actual shape of the surface of the first page.
  • the procedure allows the detection of false halves that are inadvertently fed to the process.
  • a time-consuming and expensive processing of a wrong semi-finished or blanks is avoided, especially the relatively expensive process steps such as milling, turning, polishing, hardening and coating.
  • It may also be a machined semi-finished product with a corresponding shape of the surface of the first page.
  • the deviations between the target area and the actually produced actual area are usually smaller but also present.
  • the invention has for its object to provide a method for processing lenses, with which the production of lenses is guaranteed with the lowest possible tolerances.
  • the object is achieved according to the invention in that the semi-finished product is connected to the surface of the first side with a block piece, wherein the actual shape of the surface of the first side is detected after the blocking or bonding. After blocking, nothing changes at the relative position between the block piece and the lens.
  • the determination of the shape of the surface of the first page at this time is advantageous because a resulting in the blocking deviation of the relative position between the block piece and the lens is no longer possible.
  • the step according to the invention makes a reliable quality check possible in advance of the processing. This also against the background that with semi-finished products from the Far East, the supplied technical data is quite poor and thus be checked.
  • an optical measuring means is used as the measuring means, wherein the actual shape of the blocked surface of the first side is detected by the surface of the second side to be processed.
  • the surface of the first side is at least partially hidden by the block piece.
  • the detection of the surface of the first page is possible only through the surface of the second page to be processed. Only an optical measuring device ensures the detection of the surface of the first page.
  • the outgoing from the surface of the second page to be processed optical influences on the measurement or the resulting reflections are calculated out. This procedure is based on a multi-frequency analysis.
  • the signals or reflections of the surface of the first side and the signals of the surface of the second side have different frequencies, the signals of the first side can be separated from those of the second side by means of the multi-frequency analysis. Thus, the determination of the actual shape of the blocked surface of the first side by the surface of the second side to be machined is possible.
  • the reflections The surface of the first page are filtered out in this way arithmetically from the total signal.
  • a known desired shape of the surface of the first side is compared with the determined actual shape of the surface of the first side and a deviation is determined.
  • the deviation serves as the basis for the adaptation of the desired shape of the surface of the second side to the actual conditions of the first side.
  • the target shape of the surface of the second side may already be known based on the target shape of the surface of the first side. In this case, only the target shape of the second-side surface needs to be adjusted based on the detected deviations.
  • a relative position between the first side and the lens and the block piece is determined.
  • the orientation of the lens relative to the block piece and the prism layer of the surface can thus be determined.
  • the relative position between the first side and the block piece flows into the calculation of the desired shape of the surface of the second side.
  • the second side to be produced can be adapted to the existing orientation of the first side relative to the block piece, so that the thinnest and thus lightest possible glass can be produced.
  • the position of the second side can be chosen such that a fast Machining the second side with the least possible stroke of the tool is ge gravitrleitstet.
  • a deflektometric measuring method preferably a stereo measuring method as in DE 10 2004 020 419 B3 described is used. This method has been known for over four years and has delivered very good results in the past.
  • the influences on the measurement of the surface of the first side and / or the reflections arising from the surface to be processed on the second side can easily be calculated out.
  • the desired shape of the surface of the second side of the lens is machined by means of a milling cutter and / or a turning tool and / or grinding and / or polishing.
  • the inventive method can be used equally for the processing of plastic glasses, as for mineral glasses.
  • lens 1 is formed as a semi-finished product of a spectacle lens and has a prefabricated first page 1.1.
  • an adaptation or processing of the second side 1.2 of the lens 1 is provided for the purpose of producing a finished spectacle lens 1.
  • the optical measuring means 2 has a light source 2.1 for scattered light, by means of which scattered light is thrown in the form of defined patterns on the surface to be measured of the first page 1.1.
  • the light reflects at a particular point P on the surface.
  • the light reflected from this point P is detected by a first camera 2.2 and a second camera 2.3 a respective light beam 4, 5 after.
  • the height and / or the surface normal of the surface of the first side 1.1 is determined by evaluating the patterns detected by the respective camera 2.2, 2.3.
  • the pattern mirrored in the respective point P or an image thereof is taken from at least two observation directions according to the first and second camera 2.2, 2.3, and the respective surface normal is determined therefrom with the aid of the law of reflection, wherein the actual height and the actual local surface normal the amount of points P thus treated, in which the potential surface normals match, can be determined.
  • the shape of the surface of the first page 1.1 is also determined.
  • the first page 1.1 is blocked on a block piece 3 and therefore a part of the surface of the first page 1.1 is not accessible from the outside.
  • the respective outgoing from the light source 2.1 light beam 4, 5 is deflected on the surface of the second side 1.2, strikes the respective point P and is reflected from there, with a corresponding deflection at the exit from the lens 1 on the surface of the second side 1.2 he follows.
  • the known influence of the surface of the second side 1.2 on the beam path 4, 5, ie the deflection is filtered out.

Abstract

The method involves detecting an actual form of an upper surface of a side (1.1) of an optical lens (1) in the form of a semi-finished product using an optical measuring unit (2), before evaluating a reference form of an upper surface of another side (1.2). The actual form is utilized for evaluating the reference form. The semi-finished product is connected with a block piece at the upper surface of the former side. The actual form is detected after a blocking process. A reference form of the upper surface of the former side is compared with the actual form.

Description

Die Erfindung bezieht sich auf ein Verfahren zum Bearbeiten und Berechnen einer als Halbfertigfabrikat ausgebildeten optischen Linse mit einer vorgefertigten Form einer ersten Seite und einer zu bearbeitenden zweiten Seite, bei dem zwecks Erhalt der gewünschten optischen Eigenschaft der fertigen Linse eine Soll-Form einer Oberfläche der zu bearbeitenden zweiten Seite als Verfahrensschritt berechnet wird, wobei vor der Berechnung der Soll-Form der Oberfläche der zweiten Seite eine Ist-Form der Oberfläche der ersten Seite durch Messmittel erfasst bzw. durch ein Messinstrument gemessen wird und die Ist-Form der Oberfläche der ersten Seite in die Berechnung der Soll-Form der Oberfläche der zweiten Seite einfließt.The invention relates to a method for processing and calculating an optical lens formed as a semi-finished product with a prefabricated shape of a first side and a second side to be machined, in which in order to obtain the desired optical property of the finished lens, a desired shape of a surface of is calculated as a method step, wherein prior to the calculation of the target shape of the surface of the second side an actual shape of the surface of the first side detected by measuring means or by a measuring instrument and the actual shape of the surface of the first page in the calculation of the target shape of the surface of the second side flows.

Die erste Seite oder die zweite Seite kann dabei die Vorderseite oder die Rückseite der Linse sein.The first side or the second side may be the front side or the back side of the lens.

Eine Linse bzw. ein Brillenglas hat in der Regel eine Vorderseite und eine Rückseite, die beide durch einen Rand begrenzt sind. Der Rand weist eine meist der Fassung nach gestaltete Randfläche auf. Die optische Wirkung der Vorderseite und die optische Wirkung der Rückseite überlagern sich und bilden die optische Gesamtwirkung bzw. optische Eigenschaft. Die Vorderseite oder die Rückseite bilden dabei die erste Seite während die Rückseite oder die Vorderseite die gegenüberliegende zweite Seite bildet.A lens or lens usually has a front and a back, both of which are bounded by an edge. The edge has a rim edge, which is usually designed in the shape of a frame. The optical effect of the front and the optical effect of the back overlap and form the overall optical effect or optical property. The front side or the back side form the first side while the back side or the front side forms the opposite second side.

Bei der Herstellung von Linsen, insbesondere Brillengläsern aus Kunststoff, wird in den meisten Fällen ein Linsen-Halbfertigfabrikat verwendet, dessen erste Seite vorgefertigt ist, d. h. die Form der Oberfläche der ersten Seite ist einer Soll-Form nach hergestellt. In der Regel handelt es sich um ein gegossenes Formteil, wobei die Oberfläche der ersten Seite einer Form der Formschale entspricht. Die Formschale weist in diesem Fall die abzuformende Soll-Form auf. Aufgrund der Materialeigenschaften des verwendeten Kunststoffs sowie aufgrund des Abkühlprozesses nach dem Spritzen entstehen Abweichungen zwischen der Soll-Form des Werkzeugs und der tatsächlich erhaltenen Ist-Form der Oberfläche der ersten Seite.In the manufacture of lenses, in particular plastic lenses, in most cases a lens semi-finished product is used whose first side is prefabricated, ie the shape of the surface of the first side is made according to a target shape. In general, it is a molded part, wherein the surface of the first page corresponds to a shape of the shell mold. The shell mold has in this case the form to be molded off. Due to the material properties of the plastic used as well as due to the cooling process after spraying arise deviations between the desired shape of the tool and the actually obtained actual shape of the surface of the first page.

Schließlich lässt die Verfahrensweise die Erkennung falscher Halbteile, die versehentlich dem Prozess zugeführt werden, zu. Eine zeitintensive und teure Bearbeitung eines falschen Halbfertigfabrikats bzw. Blanks wird vermieden, insbesondere die relativ teuren Verfahrensschritte wie Fräsen, Drehen, Polieren, Härten und Beschichten.Finally, the procedure allows the detection of false halves that are inadvertently fed to the process. A time-consuming and expensive processing of a wrong semi-finished or blanks is avoided, especially the relatively expensive process steps such as milling, turning, polishing, hardening and coating.

Es kann sich auch um ein spanend hergestelltes Halbfertigfabrikat mit einer entsprechenden Form der Oberfläche der ersten Seite handeln. In diesem Fall sind die Abweichungen zwischen der Soll-Fläche und der tatsächlich hergestellten Ist-Fläche in der Regel geringer aber ebenfalls vorhanden.It may also be a machined semi-finished product with a corresponding shape of the surface of the first page. In this case, the deviations between the target area and the actually produced actual area are usually smaller but also present.

Diese Abweichungen wurden bisher bei der Berechnung der Soll-Form der Oberfläche der herzustellenden zweiten Seite der Linse nicht berücksichtigt. Bei der Berechnung der Soll-Form der Oberfläche der zweiten Seite wurde lediglich die Soll-Form der Oberfläche der ersten Seite berücksichtigt.These deviations have hitherto not been taken into account in the calculation of the desired shape of the surface of the second side of the lens to be produced. In the calculation of the target shape of the surface of the second side, only the target shape of the surface of the first side was considered.

Es ist bereits ein deflektometrisches Stereo-Verfahren zur Bestimmung der lokalen Höhe und der lokalen Oberflächennormalen spiegelnder Oberflächen wie asphärische Linsen aus der DE 10 2004 020 419 B3 bekannt. Auf die aus der DE 10 2004 020 419 B3 für den Fachmann ableitbaren Lehre das Messverfahren betreffend wird hiermit vollumfänglich Bezug genommen.It is already a stereo-reflectometric method for determining the local height and local surface normal reflecting surfaces such as aspherical lenses from the DE 10 2004 020 419 B3 known. On the from the DE 10 2004 020 419 B3 for the skilled person deducible doctrine Regarding measuring method, reference is hereby made in full.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Bearbeitung von Linsen bereitzustellen, mit dem die Herstellung von Linsen mit möglichst geringen Toleranzen gewährleistet ist.The invention has for its object to provide a method for processing lenses, with which the production of lenses is guaranteed with the lowest possible tolerances.

Gelöst wird die Aufgabe erfindungsgemäß dadurch, dass das Halbfertigfabrikat mit der Oberfläche der ersten Seite mit einem Blockstück verbunden wird, wobei die Ist-Form der Oberfläche der ersten Seite nach dem Aufblocken bzw. Verbinden erfasst wird. Nach dem Aufblocken ändert sich an der relativen Lage zwischen dem Blockstück und der Linse nichts mehr. Insofern ist die Ermittlung der Form der Oberfläche der ersten Seite zu diesem Zeitpunkt vorteilhaft, weil eine beim Aufblocken entstehende Abweichung der relativen Lage zwischen Blockstück und Linse nicht mehr möglich ist.The object is achieved according to the invention in that the semi-finished product is connected to the surface of the first side with a block piece, wherein the actual shape of the surface of the first side is detected after the blocking or bonding. After blocking, nothing changes at the relative position between the block piece and the lens. In this respect, the determination of the shape of the surface of the first page at this time is advantageous because a resulting in the blocking deviation of the relative position between the block piece and the lens is no longer possible.

Vor diesem Hintergrund und durch Berücksichtigung der Ist-Geometrie bzw. der aktuellen Messwerte der Ist-Form der ersten Seite bei der Berechnung der Form der zweiten Seite der Linse wird eine äußerst präzise Berechnung der Soll-Form der zweiten Seite gewährleistet.Against this background and by taking into account the actual geometry or the current measured values of the actual shape of the first side in the calculation of the shape of the second side of the lens, an extremely precise calculation of the desired shape of the second side is ensured.

Die Fertigung individueller Rezeptflächen gewinnt mehr und mehr an Bedeutung. Mit der Fertigung individueller Rezeptflächen ist eine größere Komplexität der herzustellenden Flächen verbunden. Fertigungsfehler bekommen mehr und mehr Bedeutung. Zudem kann die fertige erste Seite von der sphärischen Form abweichen, womit weitere Toleranzen für verschiedene Krümmungswerte einhergehen würden. Unter Berücksichtigung des Wunsches nach möglichst leichten Gläsern kann über die erfindungsgemäß gewährleistete, höhere Präzision bei der Berechnung trotz wachsender Komplexität die Dicke des Glases minimiert und die gewünschte Qualität gewährleistet werden.The production of individual recipe areas is becoming more and more important. With the production of individual recipe surfaces a greater complexity of the surfaces to be produced is associated. Manufacturing errors get more and more importance. In addition, the finished first side may deviate from the spherical shape, which would be accompanied by further tolerances for different curvature values. Taking into account the desire for lenses that are as lightweight as possible, the higher precision of the calculation, which is ensured according to the invention, can be achieved despite increasing complexity Thickness of the glass minimized and the desired quality guaranteed.

Aufgrund des gestiegenen Wettbewerbs im Markt ist ein kostengünstiger Einkauf von Halbfertigfabrikaten notwendig, deren Fertigungstoleranzen jedoch größer sind. Der erfindungsgemäße Schritt macht eine verlässliche Qualitätsprüfung im Vorfeld der Bearbeitung möglich. Dies auch vor dem Hintergrund, dass bei Halbfertigfabrikaten aus Fernost die mitgelieferten technischen Daten recht dürftig ausfallen und somit überprüft werden.Due to the increased competition in the market a cost-effective purchase of semi-finished products is necessary, but whose manufacturing tolerances are greater. The step according to the invention makes a reliable quality check possible in advance of the processing. This also against the background that with semi-finished products from the Far East, the supplied technical data is quite poor and thus be checked.

Dabei kann es vorteilhafterweise vorgesehen sein, dass als Messmittel ein optisches Messmittel verwendet wird, wobei die Ist-Form der aufgeblockten Oberfläche der ersten Seite durch die Oberfläche der zu bearbeitenden zweiten Seite erfasst wird. Die Oberfläche der ersten Seite ist durch das Blockstück zumindest teilweise verdeckt. Mithin ist die Erfassung der Oberfläche der ersten Seite nur durch die Oberfläche der zu bearbeitenden zweiten Seite möglich. Nur ein optisches Messmittel gewährleistet die Erfassung der Oberfläche der ersten Seite. Dabei werden die von der Oberfläche der zu bearbeitenden zweiten Seite ausgehenden optischen Einflüsse auf die Messung bzw. die dort entstehenden Reflexionen herausgerechnet. Diese Verfahrensweise basiert auf einer Mehrfrequenzanalyse. Das die Signale bzw. Reflexionen der Oberfläche der ersten Seite und die Signale der Oberfläche der zweiten Seite unterschiedliche Frequenzen aufweisen, können mittels der Mehrfrequenzanalyse die Signale der ersten Seite von denen der zweiten Seite getrennt werden. Somit ist die Ermittlung der Ist-Form der aufgeblockten Oberfläche der ersten Seite durch die Oberfläche der zu bearbeitenden zweiten Seite möglich. Die Reflexionen der Oberfläche der ersten Seite werden auf diese Weise rechnerisch aus dem Gesamtsignal herausgefiltert.It may be advantageously provided that an optical measuring means is used as the measuring means, wherein the actual shape of the blocked surface of the first side is detected by the surface of the second side to be processed. The surface of the first side is at least partially hidden by the block piece. Thus, the detection of the surface of the first page is possible only through the surface of the second page to be processed. Only an optical measuring device ensures the detection of the surface of the first page. The outgoing from the surface of the second page to be processed optical influences on the measurement or the resulting reflections are calculated out. This procedure is based on a multi-frequency analysis. Since the signals or reflections of the surface of the first side and the signals of the surface of the second side have different frequencies, the signals of the first side can be separated from those of the second side by means of the multi-frequency analysis. Thus, the determination of the actual shape of the blocked surface of the first side by the surface of the second side to be machined is possible. The reflections The surface of the first page are filtered out in this way arithmetically from the total signal.

Vorteilhaft kann es hierzu auch sein, wenn eine bekannte Soll-Form der Oberfläche der ersten Seite mit der ermittelten Ist-Form der Oberfläche der ersten Seite verglichen und eine Abweichung ermittelt wird. Die Abweichung dient als Grundlage für die Anpassung der Soll-Form der Oberfläche der zweiten Seite an die tatsächlichen Verhältnisse der ersten Seite. Die Soll-Form der Oberfläche der zweiten Seite kann auf Grundlage der Soll-Form der Oberfläche der ersten Seite schon bekannt sein. In diesem Fall bedarf es lediglich einer Anpassung der Soll-Form der Oberfläche der zweiten Seite auf Grundlage der festgestellten Abweichungen.It can also be advantageous for this purpose if a known desired shape of the surface of the first side is compared with the determined actual shape of the surface of the first side and a deviation is determined. The deviation serves as the basis for the adaptation of the desired shape of the surface of the second side to the actual conditions of the first side. The target shape of the surface of the second side may already be known based on the target shape of the surface of the first side. In this case, only the target shape of the second-side surface needs to be adjusted based on the detected deviations.

Von besonderer Bedeutung kann für die vorliegende Erfindung sein, wenn zusätzlich zur Erfassung der Ist-Form der Oberfläche der ersten Seite eine relative Lage zwischen der ersten Seite bzw. der Linse und dem Blockstück ermittelt wird. Insbesondere die Orientierung der Linse relativ zum Blockstück und die Prismenlage der Oberfläche können somit ermittelt werden.Of particular importance may be for the present invention, in addition to detecting the actual shape of the surface of the first side, a relative position between the first side and the lens and the block piece is determined. In particular, the orientation of the lens relative to the block piece and the prism layer of the surface can thus be determined.

Im Zusammenhang mit der erfindungsgemäßen Ausbildung und Anordnung kann es von Vorteil sein, wenn in die Berechnung der Soll-Form der Oberfläche der zweiten Seite die relative Lage zwischen der ersten Seite und dem Blockstück einfließt. Die herzustellende zweite Seite kann an die bestehende Ausrichtung der ersten Seite relativ zum Blockstück angepasst werden, damit ein möglichst dünnes und damit leichtes Glas hergestellt werden kann. Ferner kann die Lage der zweiten Seite derart gewählt werden, dass eine schnelle Bearbeitung der zweiten Seite mit möglichst geringem Hub des Werkzeugs gewährleitstet ist.In connection with the design and arrangement according to the invention, it may be advantageous if the relative position between the first side and the block piece flows into the calculation of the desired shape of the surface of the second side. The second side to be produced can be adapted to the existing orientation of the first side relative to the block piece, so that the thinnest and thus lightest possible glass can be produced. Furthermore, the position of the second side can be chosen such that a fast Machining the second side with the least possible stroke of the tool is gewährleitstet.

Vorteilhaft kann es ferner sein, wenn in die Berechnung der Soll-Form der Oberfläche der zweiten Seite die zu erwartenden Maschinenabweichungen einfließen. Diese Vorgehensweise ist grundsätzlich unabhängig von der erfindungsgemäßen Verfahrensweise, nämlich die Ist-Form der Oberfläche der zweiten Seite zu ermitteln. Mit der erfindungsgemäßen Präzisionssteigerung gewinnt das Berücksichtigen der Maschinenabweichungen, also der Positions-Protokoll-Daten, an Bedeutung.It can also be advantageous if the expected machine deviations are included in the calculation of the desired shape of the surface of the second side. This procedure is basically independent of the procedure according to the invention, namely to determine the actual shape of the surface of the second side. With the increase in precision according to the invention, the consideration of the machine deviations, that is the position protocol data, becomes more important.

Außerdem kann es vorteilhaft sein, wenn ein deflektometrisches Messverfahren, vorzugsweise ein Stereo-Messverfahren wie in der DE 10 2004 020 419 B3 beschrieben verwendet wird. Dieses Verfahren ist schon seit über vier Jahren bekannt und hat in der Vergangenheit sehr gute Messergebnisse geliefert. Zudem lassen sich die von der zu bearbeitenden Oberfläche der zweiten Seite einhergehenden Einflüsse auf die Messung der Oberfläche der ersten Seite bzw. die entstehenden Reflexionen ohne Weiteres herausrechnen.Moreover, it may be advantageous if a deflektometric measuring method, preferably a stereo measuring method as in DE 10 2004 020 419 B3 described is used. This method has been known for over four years and has delivered very good results in the past. In addition, the influences on the measurement of the surface of the first side and / or the reflections arising from the surface to be processed on the second side can easily be calculated out.

Ferner kann es vorteilhaft sein, wenn die Soll-Form der Oberfläche der zweiten Seite der Linse spanend mittels eines Fräsers und/oder eines Drehwerkzeugs und/oder schleifend und/oder polierend bearbeitet wird. Das erfindungsgemäße Verfahren kann für die Bearbeitung von Kunststoff-Gläsern gleichermaßen eingesetzt werden, wie für mineralische Gläser.Furthermore, it may be advantageous if the desired shape of the surface of the second side of the lens is machined by means of a milling cutter and / or a turning tool and / or grinding and / or polishing. The inventive method can be used equally for the processing of plastic glasses, as for mineral glasses.

Weitere Vorteile und Einzelheiten der Erfindung sind in den Patentansprüchen und in der Beschreibung erläutert und in den Figuren dargestellt. Es zeigt:

Figur 1
eine Prinzipskizze des Messverfahrens;
Figur 2
eine Prinzipskizze des Messverfahrens mit aufgeblockter Linse.
Further advantages and details of the invention are explained in the patent claims and in the description and illustrated in the figures. It shows:
FIG. 1
a schematic diagram of the measuring method;
FIG. 2
a schematic diagram of the measuring method with blocked lens.

Eine in Figur 1 dargestellte Linse 1 ist als Halbfertigfabrikat eines Brillenglases ausgebildet und weist eine vorgefertigte erste Seite 1.1 auf. Zwecks Herstellung eines fertigen Brillenglases 1 ist eine Anpassung bzw. Bearbeitung der zweiten Seite 1.2 der Linse 1 vorgesehen. Bei der Berechnung einer Soll-Form der Oberfläche der zweiten Seite 1.2 wird die tatsächliche Ist-Form der Oberfläche der ersten Seite 1.1 über ein optisches Messmittel 2 erfasst. Das optische Messmittel 2 weist eine Lichtquelle 2.1 für gestreutes Licht auf, mittels welcher gestreutes Licht in Form definierter Muster auf die zu vermessende Oberfläche der ersten Seite 1.1 geworfen wird. Das Licht reflektiert in einem jeweiligen Punkt P auf der Oberfläche. Das von diesem Punkt P reflektierte Licht wird durch eine erste Kamera 2.2 und eine zweite Kamera 2.3 einem jeweiligen Lichtstrahl 4, 5 nach erfasst. Bei dem Messverfahren wird die Höhe und/oder die Oberflächennormale der Oberfläche der ersten Seite 1.1 ermittelt, indem die von der jeweiligen Kamera 2.2, 2.3 erfassten Muster ausgewertet werden. Dabei wird aus mindestens zwei Beobachtungsrichtungen gemäß der ersten und zweiten Kamera 2.2, 2.3 das in dem jeweiligen Punkt P gespiegelte Muster bzw. ein Bild davon aufgenommen und daraus die jeweilige Oberflächennormale mit Hilfe des Reflektionsgesetzes bestimmt, wobei die tatsächliche Höhe und die tatsächliche lokale Oberflächennormale durch die Menge der so behandelten Punkte P, in denen die potenziellen Oberflächennormalen übereinstimmen, bestimmt werden.An in FIG. 1 shown lens 1 is formed as a semi-finished product of a spectacle lens and has a prefabricated first page 1.1. For the purpose of producing a finished spectacle lens 1, an adaptation or processing of the second side 1.2 of the lens 1 is provided. When calculating a target shape of the surface of the second side 1.2, the actual shape of the surface of the first side 1.1 is detected by an optical measuring means 2. The optical measuring means 2 has a light source 2.1 for scattered light, by means of which scattered light is thrown in the form of defined patterns on the surface to be measured of the first page 1.1. The light reflects at a particular point P on the surface. The light reflected from this point P is detected by a first camera 2.2 and a second camera 2.3 a respective light beam 4, 5 after. In the measuring method, the height and / or the surface normal of the surface of the first side 1.1 is determined by evaluating the patterns detected by the respective camera 2.2, 2.3. In this case, the pattern mirrored in the respective point P or an image thereof is taken from at least two observation directions according to the first and second camera 2.2, 2.3, and the respective surface normal is determined therefrom with the aid of the law of reflection, wherein the actual height and the actual local surface normal the amount of points P thus treated, in which the potential surface normals match, can be determined.

Im Ausführungsbeispiel gemäß Figur 2 wird ebenfalls die Form der Oberfläche der ersten Seite 1.1 bestimmt. In diesem Fall ist die erste Seite 1.1 auf ein Blockstück 3 aufgeblockt und daher ein Teil der Oberfläche der ersten Seite 1.1 von außen nicht zugänglich. Der jeweilige von der Lichtquelle 2.1 ausgehende Lichtstrahl 4, 5 wird an der Oberfläche der zweiten Seite 1.2 abgelenkt, trifft auf den jeweiligen Punkt P und wird von dort reflektiert, wobei eine entsprechende Ablenkung beim Austritt aus der Linse 1 an der Oberfläche der zweiten Seite 1.2 erfolgt. Bei der Berechnung der Höhe und der Oberflächennormalen im Punkt P wird der bekannte Einfluss der Oberfläche der zweiten Seite 1.2 auf den Strahlengang 4, 5, also die Ablenkung ausgefiltert.In the embodiment according to FIG. 2 the shape of the surface of the first page 1.1 is also determined. In this case, the first page 1.1 is blocked on a block piece 3 and therefore a part of the surface of the first page 1.1 is not accessible from the outside. The respective outgoing from the light source 2.1 light beam 4, 5 is deflected on the surface of the second side 1.2, strikes the respective point P and is reflected from there, with a corresponding deflection at the exit from the lens 1 on the surface of the second side 1.2 he follows. When calculating the height and the surface normal at the point P, the known influence of the surface of the second side 1.2 on the beam path 4, 5, ie the deflection is filtered out.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Linse, Halbfertigfabrikat, BrillenglasLens, semi-finished product, spectacle lens
1.11.1
erste Seite, Oberflächefirst page, surface
1.21.2
zweite Seite, Oberflächesecond side, surface
22
Messmittel, optisches MessmittelMeasuring equipment, optical measuring equipment
2.12.1
Lichtquellelight source
2.22.2
erste Kamerafirst camera
2.32.3
zweite Kamerasecond camera
33
Blockstückblock piece
44
Strahlengangbeam path
55
Strahlengangbeam path
PP
PunktPoint

Claims (9)

Verfahren zum Bearbeiten und Berechnen einer als Halbfertigfabrikat ausgebildeten optischen Linse (1) mit einer vorgefertigten Form einer ersten Seite (1.1) und einer zu bearbeitenden zweiten Seite (1.2), bei dem eine Soll-Form einer Oberfläche der zu bearbeitenden zweiten Seite (1.2) berechnet wird, wobei a) vor der Berechnung der Soll-Form der Oberfläche der zweiten Seite (1.2) eine Ist-Form der Oberfläche der ersten Seite (1.1) durch Messmittel (2) erfasst wird; b) die Ist-Form der Oberfläche der ersten Seite (1.1) in die Berechnung der Soll-Form der Oberfläche der zweiten Seite (1.2) einfließt,
dadurch gekennzeichnet, dass c) das Halbfertigfabrikat (1) mit der Oberfläche der ersten Seite (1.1) mit einem Blockstück (3) verbunden wird, wobei die Ist-Form der Oberfläche der ersten Seite (1.1) nach dem Aufblocken erfasst wird. Method for processing and calculating an optical lens (1) designed as a semi-finished product with a prefabricated form of a first side (1.1) and a second side (1.2) to be machined, in which a desired shape of a surface of the second side (1.2) to be machined is calculated, where a) before the calculation of the desired shape of the surface of the second side (1.2) an actual shape of the surface of the first side (1.1) by measuring means (2) is detected; b) the actual shape of the surface of the first side (1.1) flows into the calculation of the desired shape of the surface of the second side (1.2),
characterized in that c) the semi-finished product (1) with the surface of the first side (1.1) is connected to a block piece (3), wherein the actual shape of the surface of the first side (1.1) is detected after blocking. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
dass als Messmittel (2) ein optisches Messmittel verwendet wird, wobei die Ist-Form der aufgeblockten Oberfläche der ersten Seite (1.1) durch die Oberfläche der zu bearbeitenden zweiten Seite (1.2) erfasst wird.Method according to claim 1,
characterized,
in that an optical measuring means is used as the measuring means (2), wherein the actual shape of the blocked surface of the first side (1.1) is detected by the surface of the second side (1.2) to be processed. Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
dass eine bekannte Soll-Form der Oberfläche der ersten Seite (1.1) mit der ermittelten Ist-Form der Oberfläche der ersten Seite (1.1) verglichen und eine Abweichung ermittelt wird.Method according to claim 1 or 2,
characterized,
that a known target shape of the surface of the first side (1.1) with the determined actual shape of the surface of the first side (1.1) are compared, and a deviation is determined. Verfahren nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
dass zusätzlich zur Erfassung der Ist-Form der Oberfläche der ersten Seite (1.1) eine relative Lage zwischen der ersten Seite (1.1) und dem Blockstück (3) ermittelt wird.Method according to one of claims 1 to 3,
characterized,
in that, in addition to the detection of the actual shape of the surface of the first side (1.1), a relative position between the first side (1.1) and the block piece (3) is determined. Verfahren nach Anspruch 4,
dadurch gekennzeichnet,
dass in die Berechnung der Soll-Form der Oberfläche der zweiten Seite (1.2) die relative Lage zwischen der ersten Seite (1.1) und dem Blockstück (3) einfließt.Method according to claim 4,
characterized,
that in the calculation of the desired shape of the surface of the second side (1.2), the relative position between the first side (1.1) and the block piece (3) flows. Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
dass in die Berechnung der Soll-Form der Oberfläche der zweiten Seite (1.2) die zu erwartenden Maschinenabweichungen einfließen.Method according to one of the preceding claims,
characterized,
in that the expected machine deviations are included in the calculation of the desired shape of the surface of the second side (1.2). Verfahren nach einem der Ansprüche 3 bis 6,
dadurch gekennzeichnet,
dass ein deflektometrisches Messverfahren verwendet wird.Method according to one of claims 3 to 6,
characterized,
that a deflektometric measuring method is used. Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
dass die Soll-Form der Oberfläche der zweiten Seite (1.2) der Linse (1) spanend mittels eines Fräsers und/oder eines Drehwerkzeugs und/oder schleifend und/oder polierend bearbeitet wird.Method according to one of the preceding claims,
characterized,
that the desired shape of the surface of the second side (1.2) of the lens (1) is machined by means of a milling cutter and / or a turning tool and / or grinding and / or polishing. Verwendung des Verfahrens nach einem der vorhergehenden Ansprüche zum Bearbeiten einer Linse (1) aus Kunststoff oder aus Mineralglas.Use of the method according to one of the preceding claims for processing a lens (1) made of plastic or of mineral glass.
EP09178032A 2008-12-05 2009-12-04 Method for processing and calculating an optical lens designed as a semi-finished product Active EP2193880B1 (en)

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EP2522458B1 (en) * 2011-05-13 2016-07-06 ESSILOR INTERNATIONAL (Compagnie Générale d'Optique) Process for determining position parameters of a manufactured surface relative to a reference surface
DE102013005714B4 (en) * 2013-04-02 2017-03-23 Rodenstock Gmbh Production of microstructured spectacle lenses in the manufacture of prescription glasses

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DE10103113A1 (en) * 2001-01-24 2002-08-01 Rodenstock Optik G Process for the manufacture of spectacle lenses
DE102004020419B3 (en) * 2004-04-23 2005-10-20 3D Shape Gmbh Method and apparatus for determining the shape and local surface normal of specular surfaces

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JP2797333B2 (en) 1988-09-16 1998-09-17 セイコーエプソン株式会社 Method and apparatus for manufacturing contact lens
JP3829435B2 (en) 1996-10-14 2006-10-04 セイコーエプソン株式会社 Manufacturing method of spectacle lens
US20060176491A1 (en) * 2004-12-22 2006-08-10 Hall William J Device and method for non-contact scanning of contact lens mold geometry
DE202005009847U1 (en) 2005-03-23 2005-10-20 Oculus Optikgeräte GmbH Measuring device for measuring the refractive properties of optical lenses
US20080100850A1 (en) * 2006-10-31 2008-05-01 Mitutoyo Corporation Surface height and focus sensor
JP5238322B2 (en) * 2008-03-28 2013-07-17 株式会社トプコン Ball shape measuring device

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Publication number Priority date Publication date Assignee Title
DE10103113A1 (en) * 2001-01-24 2002-08-01 Rodenstock Optik G Process for the manufacture of spectacle lenses
DE102004020419B3 (en) * 2004-04-23 2005-10-20 3D Shape Gmbh Method and apparatus for determining the shape and local surface normal of specular surfaces

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EP2193880A3 (en) 2011-06-08
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DE102008060589B4 (en) 2015-06-03
US7936451B2 (en) 2011-05-03

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