EP2293900B1 - Method for machining an eyeglass lens blank and eyeglass lens blank comprising a connecting material and block piece - Google Patents

Method for machining an eyeglass lens blank and eyeglass lens blank comprising a connecting material and block piece Download PDF

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Publication number
EP2293900B1
EP2293900B1 EP09742138.2A EP09742138A EP2293900B1 EP 2293900 B1 EP2293900 B1 EP 2293900B1 EP 09742138 A EP09742138 A EP 09742138A EP 2293900 B1 EP2293900 B1 EP 2293900B1
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EP
European Patent Office
Prior art keywords
lens blank
diameter
spectacle lens
block
connective
Prior art date
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Application number
EP09742138.2A
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German (de)
French (fr)
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EP2293900A1 (en
Inventor
Gunter Schneider
Helwig Buchenauer
Klaus Krämer
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 EP2293900A1 publication Critical patent/EP2293900A1/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
    • B24B13/005—Blocking means, chucks or the like; Alignment devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
    • B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
    • B24B9/146—Accessories, e.g. lens mounting devices

Definitions

  • the invention relates to a processing method for a spectacle lens blank, preferably made of plastic, in which a block piece for holding and supporting the lens blank is connected in a processing machine by means of a connecting compound with a first side of the lens blank, for this purpose between the block piece and the first side at least a cavity is delimited using a sealing or supporting means, wherein the sealing or supporting means has an inner diameter Dd, Ds and is preferably sealingly applied in the region of the inner diameter Dd, Ds against the first side, in the cavity, the compound compound is filled or in the compound is already provided compound compound and then cured.
  • the bonding compound does not necessarily have to be filled or poured.
  • the bonding compound is pre-portioned in a somewhat firmer form is applied to the block piece and then the lens blank is placed or pressed.
  • the lens blank is placed against the support means for the purpose of determining its relative position to the block piece and the compound compound is molded onto the lens blank or the first side.
  • the lens blank only then limits the cavity thus formed and already prefilled.
  • the cavity is only partially limited when using pre-portioned compound by the lens blank, the block piece and the support means. A sealing closure of the cavity is not necessary.
  • the support means has only three contact points for the lens blank.
  • the Eyeglass blank inserted over the molded by means of the compound mass block piece in a milling and / or lathe or grinder, wherein the lens blank is supported on the first side by the connecting mass over a diameter Dd, Ds corresponding diameter Dv.
  • Dd diameter
  • Ds diameter
  • Dv diameter
  • a block piece for spectacle lens blanks which has a coupling part and a holding part.
  • the holding part can be shaped to the shape of the lens blank.
  • the necessary holding power is by heating and pressing, if necessary with the addition of adhesive, achieved.
  • the associated with the pressing deformation of the lens blank is disadvantageous because they have a negative effect on the geometry of the lens or the lens at the latest after blocking.
  • the spectacle lens blank is supported by the bonding compound only in the area of the diameter which is under no circumstances machined. A further reduction of the diameter can be made only after the blocking of the block piece including the bonding mass.
  • US 1 952 373 A describes a processing method according to the preamble of claim 1 and a unit according to the preamble of claim 9.
  • the invention has for its object to form a processing method for a lens blank and a lens blank block assembly such that optimal processing of the lens blank is ensured during processing.
  • the object is achieved erfingdungsloom by a method according to claim 1 and a unit according to claim 9.
  • This ensures that the lens blank is almost or fully supported by the bonding compound, since the original supernatant of the lens blank is processed via the bonding compound or its edge .
  • the choice of the diameter Dd, Ds of the sealing or proppant and thus the choice of the diameter Dv of the bonding compound can be done regardless of what diameter Dr the lens blank undergoes during processing or to what diameter the lens blank must be reduced during processing.
  • the bonding compound the lens blank is supported as far or as wide as possible during the blocking, so that after reduction of the blank diameter Dr to the semifinished product diameter D1, almost 100% support of the semifinished product is ensured.
  • the inner diameter Dd, Ds of the sealing or supporting means is selected as a function of a diameter Dr of the lens blank such that the inner diameter Dd, Ds is at most between 1 mm and 20 mm, in particular between 2 mm and 6 mm smaller is the diameter Dr of the lens blank. Since a lens blank usually has a very irregular peripheral surface, remains as a sealing surface for applying the sealant for the purpose of limiting the cavity for the compound mass only the first side of the lens blank. In addition, since the prefabricated first page is a more precise reference surface.
  • an edge of the lens blank is machined and the diameter Dr is reduced to a diameter D1, wherein for the diameter D1 the dimension of the diameter Dv or a dimension which is at most 1 mm to 6 mm is larger, is provided.
  • the diameter D1 should be the measure of the diameter Dv of the bonding mass.
  • this processing step it is also possible to reduce both the lens blank and the bonding compound to a diameter smaller than D1 as set forth below.
  • a second side of the lens blank opposite the first side is machined or ground, wherein before or after the machining of the second side the diameter Dr, Dv of the lens blank or the edge and a Be processed diameter of the compound or machined or ground.
  • the round shape of the lens blank or of the lens thus produced is generally independent of the shape of the lens to be produced Retain semi-finished, wherein the diameter Dr is reduced as described above to a level D1, which still ensures the production of the desired spectacle lens.
  • the round shape of the semi-finished product is usually maintained for two reasons.
  • the lens blank is not only reduced in diameter to a minimum during the cutting or chip process, but also receives an oval or polygonal shape deviating from the round shape. Also in this case, it is possible to support not only the round central part of the semifinished product by the bonding compound, but the whole first side of the lens blank or the semifinished product, regardless of the shape. The compound is processed with.
  • a protective layer is provided between the lens blank and the bonding compound.
  • the protective layer is usually applied in advance on the lens blank or is already provided on this, so that the prefabricated first page is not damaged.
  • the lens blank is so held indirectly over the protective layer of the bonding compound.
  • the connecting compound is introduced into the cavity via a plurality of filler neck or via a plurality of outlet openings of one or more filler neck.
  • the filler neck or the outlet openings have different directional components, so that the bonding compound is not only introduced at different positions of the respective filler neck, but is also introduced within a position of a filler neck in different directions or with different directional components.
  • the various positions of the filler neck also different directional shares go for the compound mass to be introduced.
  • the filling level of the bonding compound within the cavity is monitored by means of a laser distance sensor.
  • a laser distance sensor has the necessary focus to detect from outside the level in the filling opening.
  • compound mass reflective additives can be provided which ensure the detection of the level by means of the laser distance sensor, especially with clear compound masses.
  • the compound compound can be applied in a pre-portioned manner to the block piece, and then the lens blank can be placed on and / or pressed on, the compound compound being molded onto the lens blank. This sealing and pouring the compound is no longer necessary.
  • the connecting mass is cured after molding to the blank, so that the necessary holding force is developed.
  • the object is also achieved by a lens blank having a diameter Dr, which is attached via selectge cast compound to a block piece, wherein the compound mass has an outer diameter Dv, and the diameter Dv is at most 2 mm to 6 mm, in particular at most 4 mm smaller than the diameter Dr.
  • the diameter Dv of the bonding compound is maximized for the purpose of maximum support of the blank, with a projection of the blank over the bonding compound for the purpose of conditioning the sealant or block ring is necessary.
  • the diameter Dv is about 2 mm smaller than the diameter Dr, so that the following values result for the diameter Dv as a function of the diameter Dr. Dr [mm] 65 70 75 80 85 90 Dv [mm] 63 68 73 78 83 88 Dv [mm] 61 66 71 76 81 86
  • the value of the diameter Dv depends on the space required for the sealing or the installation of the sealant. In the above table, the space requirement is taken into account initially 1 mm and in the last line 2 mm. The corresponding difference between the diameters Dr and Dv is thus 2 mm or 4 mm respectively.
  • the block piece has a bearing surface which acts in the axial direction with respect to the central axis has and for receiving in a chuck of the processing machine with the contact surface in the axial direction against the chuck for conditioning can be brought.
  • a precise clamping of the block piece is ensured, whereby the processing is further optimized on the whole.
  • This contact surface was previously cast by means of the compound compound to the block piece.
  • both the block piece 2 and the spectacle glass blank 1 are placed in a block machine 7 partially shown.
  • the blocking machine 7 has a receiving dome 7.2 into which the block piece 2 is inserted.
  • a guide dome 7.7 is provided, which is mounted on a swivel plate 7.3 in the blocker machine 7.
  • the swivel plate 7.3 in addition to various other gear members also has a rotation axis 7.4.
  • an ejector 7.6 is provided for later ejection of the block piece.
  • the spectacle lens blank 1 to be lifted is placed over the block piece 2, whereby a block ring formed as a sealing means 4 and the guide dome 7.7 between the spectacle lens blank 1 and the block piece 2 or the receiving dome 7.2 are placed in order to ensure a cavity 5 to be filled by bonding compound 3.
  • the block ring 4 thus seals against the lens blank 1 or its first lower side 1.1 and against the guide dome 7.7.
  • the guide dome 7.7 seals against the receiving dome 7.2, while the receiving dome 7.2 seals against the block piece 2.
  • a filling opening 4.1 is provided.
  • a cylindrical or oval filler neck 7.5 of the blocking machine 7 is arranged, via which liquid compound compound 3 is introduced into the cavity 5.
  • the filler neck 7.5 is movable with respect to the inflow direction.
  • a distance between the filler neck 7.5 and the filling opening 4.1 is changeable for the purpose of improved introduction.
  • a laser distance sensor 9 is provided, via which the fill level in the filling opening 4.1 is monitored.
  • a measuring beam 9.1 is introduced laterally and extends in operation approximately in a plane of the central axis of the filler neck 7.5.
  • the blocking machine 7 a holder 7.1, which biases the lens blank 1 in the axial direction against the sealant or the block ring 4.
  • the lens blank 1, the block piece 2 and the block ring 4 with the filling opening 4.1 are employed in the blocking machine 7 relative to the vertical at an angle ⁇ of about 20 °.
  • the bonding compound 3 thus enters from the filler neck 7.5 through the filling opening 4.1 in the angled at the angle ⁇ cavity 5, whereby it is filled from bottom to top.
  • the connecting compound 3 has a diameter Dv which is slightly smaller than the diameter Dr of the lens blank 1.
  • the lens blank 1 is usually reduced to a diameter D1 in a first processing step, wherein the remaining difference between the diameter D1 and the diameter Dv of the connecting mass 3 according to the invention should be as small as possible so that the largest possible support of the lens blank 1 is ensured by the bonding compound 3.
  • the edge 1.3 and / or a second side 1.2 of the lens blank 1 and the bonding compound 3 are processed.
  • the block piece 2 has a first recess 2.1, which with a not shown nose of a machine holder in order to ensure orientation in operative connection can be brought.
  • a recess not shown, is provided which serves to transmit a torque.
  • the block piece 2 has an axial contact surface 2.2, which is provided adjacent to a cylindrical clamping surface 2.3.
  • the block piece 2 has a further undercut 2.4, which ensures an acting in the axial direction positive connection between the connecting mass 3 and the block piece 2.
  • FIG. 2 An in FIG. 2 represented chuck 8 a machine tool is thus in the radial direction against the cylindrical clamping surface 2.3 and in the axial direction against the axial stop surface 2.2 can be applied.
  • the relative position between the block piece 2 and the chuck 8 is thus subject to no influences, which are due to the compound mass 3.
  • the sealing means 4 has the inner diameter Dd, which corresponds to the diameter Dv of the connecting compound 3.
  • the inner diameter Dd or the diameter Dv is smaller than the diameter Dr of the lens blank 1, since the sealant 4 must abut against the first side 1.1 of the lens blank 1.
  • FIG. 3b Alternatively, the use of a support means 4 is shown, which has three support points 4a, 4b, 4c, against which the first side 1.1 of the lens blank 1 must be present for the purpose of determining the relative position.
  • the compound compound 3 is formed when placing or pressing the lens blank 1 and spreads radially outward.
  • the support means 4 has a corresponding diameter Ds, which is determined by the three support points 4a, 4b, 4c.
  • the effectively available Diameter Dv corresponds at least to the diameter Ds. In the region between the three support points 4a, 4b, 4c, the effective diameter of the connecting mass 3 is even greater, but only over parts of the circumference. A steady support is given about the diameter Ds.
  • FIG. 4a Runs the filler neck 7.5 in contrast to that according to embodiment 1 V-shaped and has two outlet 7.51, 7.52, which are arranged at an angle of about 30 ° to each other.
  • the outlet openings 7.51, 7.52 can be round or oval.
  • the inflowing compound compound 3 is delivered with different directional components, ie both to the right and to the left side, so that a more uniform and faster distribution of the compound mass 3 within the cavity 5 is guaran teed.
  • FIG. 4b is opposite the filler neck 7.5, a further filler neck 7.5 '' provided over the additional or alternatively (not shown) from below compound compound 3 can be introduced into the cavity 5.
  • the filler neck 7.5 " is as in the embodiment according to FIG. 1 V-shaped.
  • the outlet openings 7.51, 7.52 can be round or oval.
  • the centrally arranged filler neck 7.5 ' is also V-shaped in this embodiment, so that the connecting compound 3 is discharged via two outlet openings 7.53, 7.54 with different directional components.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Eyeglasses (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Description

Die Erfindung bezieht sich auf ein Bearbeitungsverfahren für einen Brillenglasrohling, vorzugsweise aus Kunststoff, bei dem ein Blockstück zum Halten und Unterstützen des Brillenglasrohlings in einer Bearbeitungsmaschine mittels einer Verbindungsmasse mit einer ersten Seite des Brillenglasrohlings verbunden wird, wobei hierzu zwischen dem Blockstück und der ersten Seite zumindest unter Einsatz eines Dicht- oder Stützmittels ein Hohlraum begrenzt wird, wobei das Dicht- oder Stützmittel einen Innendurchmesser Dd, Ds aufweist und im Bereich des Innendurchmessers Dd, Ds gegen die erste Seite vorzugsweise dichtend angelegt wird, in den Hohlraum die Verbindungsmasse eingefüllt wird oder in dem Hohlraum bereits Verbindungsmasse vorgesehen ist und anschließend ausgehärtet wird. Die Verbindungsmasse muss nicht zwingend eingefüllt bzw. eingegossen werden. Es ist auch möglich, dass die Verbindungsmasse in etwas festerer Form vorportioniert auf das Blockstück aufgebracht wird und anschließend der Brillenglasrohling aufgesetzt bzw. aufgedrückt wird. Dabei wird der Brillenglasrohling gegen das Stützmittel zwecks Bestimmung seiner relativen Lage zum Blockstück angelegt und die Verbindungsmasse an den Brillenglasrohling bzw. die erste Seite angeformt. Der Brillenglasrohling begrenzt erst dann den so gebildeten und bereits vorgefüllten Hohlraum. Der Hohlraum wird beim Einsatz vorportionierter Verbindungsmasse durch den Brillenglasrohling, das Blockstück und das Stützmittel nur teilweise begrenzt. Ein dichtendes Abschließen des Hohlraums ist nicht notwendig. In diesem Fall ist es möglich, dass das Stützmittel lediglich drei Anlagepunkte für den Brillenglasrohling aufweist. Anschließend wird der Brillenglasrohling über das mittels der Verbindungsmasse angegossene Blockstück in eine Fräs- und/oder Drehmaschine oder Schleifmaschine eingesetzt, wobei der Brillenglasrohling auf der ersten Seite durch die Verbindungsmasse über einen dem Durchmesser Dd, Ds entsprechenden Durchmesser Dv unterstützt wird. Neben der spanenden Bearbeitung von Brillenglasrohlingen aus Kunststoff können auch Brillenglasrohlinge aus Mineralglas auf diese Art unterstützt bzw. bearbeitet werden.The invention relates to a processing method for a spectacle lens blank, preferably made of plastic, in which a block piece for holding and supporting the lens blank is connected in a processing machine by means of a connecting compound with a first side of the lens blank, for this purpose between the block piece and the first side at least a cavity is delimited using a sealing or supporting means, wherein the sealing or supporting means has an inner diameter Dd, Ds and is preferably sealingly applied in the region of the inner diameter Dd, Ds against the first side, in the cavity, the compound compound is filled or in the compound is already provided compound compound and then cured. The bonding compound does not necessarily have to be filled or poured. It is also possible that the bonding compound is pre-portioned in a somewhat firmer form is applied to the block piece and then the lens blank is placed or pressed. In this case, the lens blank is placed against the support means for the purpose of determining its relative position to the block piece and the compound compound is molded onto the lens blank or the first side. The lens blank only then limits the cavity thus formed and already prefilled. The cavity is only partially limited when using pre-portioned compound by the lens blank, the block piece and the support means. A sealing closure of the cavity is not necessary. In this case, it is possible that the support means has only three contact points for the lens blank. Subsequently, the Eyeglass blank inserted over the molded by means of the compound mass block piece in a milling and / or lathe or grinder, wherein the lens blank is supported on the first side by the connecting mass over a diameter Dd, Ds corresponding diameter Dv. In addition to the machining of plastic lens blanks and glass lens blanks made of mineral glass can be supported or processed in this way.

Alternativ zu dem Einsatz von angegossenen Blockstücken, die in der Regel aus Metall sind, können nach der Lehre der WO 2007/017385 A2 bzw. DE 10 2005 038 063 A1 auch Blockstücke aus Kunststoff Anwendung finden, mittels derer eine entsprechend große Unterstützung des Brillenglasrohlings gewährleistet wäre. Jedoch sind damit zwei wesentliche Nachteile verbunden. Zum einen mangelt es den derzeit verfügbaren Haftmitteln, die zum Befestigen des Brillenglasrohlings auf dem Kunststoffblockstück Verwendung finden, an der nötigen Haltekraft. Zwecks Erhalt einer ausreichend großen Haltekraft müssen der Brillenglasrohling und das Blockstück gegeneinander gepresst werden, was zu nachteiligen Verformungen des Brillenglasrohlings führen kann, die sich spätestens nach dem Abblocken nachteilig auf die Geometrie des Glases bzw. der Linse auswirken. Zum anderen weisen die Kunststoffblockstücke eine sehr geringe Festigkeit auf, was zu nachteiligen Einflüssen auf die Halteposition innerhalb eines Spannfutters einer Bearbeitungsmaschine führt.As an alternative to the use of cast block pieces, which are usually made of metal, according to the doctrine of WO 2007/017385 A2 respectively. DE 10 2005 038 063 A1 Also find block pieces of plastic application, by means of which a correspondingly large support of the lens blank would be guaranteed. However, this involves two major disadvantages. Firstly, there is a lack of the currently available adhesives, which are used to attach the lens blank on the plastic block piece, to the necessary holding power. In order to obtain a sufficiently large holding force of the lens blank and the block piece must be pressed against each other, which can lead to adverse deformations of the lens blank that adversely affect at the latest after blocking disadvantageous to the geometry of the glass or the lens. On the other hand, the plastic block pieces have a very low strength, which leads to adverse effects on the holding position within a chuck of a processing machine.

Aus der DE 103 04 388 A1 ist ein Blockstück für Brillenglasrohlinge bekannt, das einen Kupplungsteil und einen Halteteil aufweist. Der Halteteil ist an die Form des Brillenglasrohlings anformbar. Die notwendige Haltekraft wird durch Erwärmung und Anpressen, ggf. unter Zusatz von Klebemittel, erreicht. Die mit dem Anpressen einhergehende Verformung des Brillenglasrohlings ist nachteilig, weil diese sich spätestens nach dem Abblocken nachteilig auf die Geometrie des Brillenglases bzw. der Linse auswirken.From the DE 103 04 388 A1 a block piece for spectacle lens blanks is known which has a coupling part and a holding part. The holding part can be shaped to the shape of the lens blank. The necessary holding power is by heating and pressing, if necessary with the addition of adhesive, achieved. The associated with the pressing deformation of the lens blank is disadvantageous because they have a negative effect on the geometry of the lens or the lens at the latest after blocking.

Aus der DE 696 04 116 T2 sowie der EP0740979 ist bereits ein Verfahren zum Verbinden eines Blockstücks mit einem Brillenglasrohling mittels einer Verbindungsmasse bekannt. Die verbindungsmasse besteht dabei aus einer Schwermetalllegierung, welche bei dem folgenden Zerspanprozess des Brillenglasrohlings keinesfalls bearbeitet bzw. beschädigt werden darf. Dementsprechend wird der Brillenglasrohling unter Berücksichtigung eines Sicherheitsmaßes nur in dem Bereich des Durchmessers, der auf keinen Fall bearbeitet wird, von der Verbindungsmasse unterstützt. Eine weitere Reduzierung des Durchmessers kann erst nach dem Ablocken des Blockstücks inklusive der Verbindungsmasse erfolgen.From the DE 696 04 116 T2 as well as the EP0740979 For example, a method for connecting a block piece to a lens blank by means of a bonding compound is already known. The compound compound consists of a heavy metal alloy, which must not be processed or damaged in the following Zerspanprozess the lens blank. Accordingly, taking into account a safety measure, the spectacle lens blank is supported by the bonding compound only in the area of the diameter which is under no circumstances machined. A further reduction of the diameter can be made only after the blocking of the block piece including the bonding mass.

US 1 952 373 A beschreibt ein Bearbeitungsverfahren nach dem Oberbegriff des Anspruchs 1 sowie eine Einheit nach dem Oberbegriff des Anspruchs 9. US 1 952 373 A describes a processing method according to the preamble of claim 1 and a unit according to the preamble of claim 9.

Der Erfindung liegt die Aufgabe zugrunde, ein Bearbeitungs-verfahren für einen Brillenglasrohling und eine Brillenglasrohling-Blockstück-Baugruppe derart auszubilden, dass eine optimale Bearbeitung des Brillenglasrohlings während der Bearbeitung gewährleistet ist.The invention has for its object to form a processing method for a lens blank and a lens blank block assembly such that optimal processing of the lens blank is ensured during processing.

Gelöst wird die Aufgabe erfingdungsgemäß durch ein Verfahren nach Anspruch 1 und eine Einheit nach Anspruch 9. Hierdurch wird erreicht, dass der Brillenglasrohling nahezu bzw. vollständig durch die Verbindungsmasse unterstützt ist, da der ursprüngliche Überstand des Brillenglasrohlings über die Verbindungsmasse bzw. deren Rand abgearbeitet ist. Die Wahl des Durchmessers Dd, Ds des Dicht- oder Stützmittels und somit die Wahl des Durch-messers Dv der Verbindungsmasse kann unabhängig davon erfolgen, welchen Durchmesser Dr der Brillenglasrohling während des Bearbeitens erfährt bzw. auf welchen Durchmesser der Brillenglasrohling während des Bearbeitens reduziert werden muss. Mittels der Verbindungsmasse wird der Brillenglasrohling bei dem Aufblocken so weit bzw. breit wie möglich unterstützt, so dass nach Reduzierung des Rohlingsdurchmessers Dr auf den Halbzeugdurchmesser D1 schon eine nahezu 100 %-ige Unterstützung des Halbzeugs gewährleistet ist.The object is achieved erfingdungsgemäß by a method according to claim 1 and a unit according to claim 9. This ensures that the lens blank is almost or fully supported by the bonding compound, since the original supernatant of the lens blank is processed via the bonding compound or its edge , The choice of the diameter Dd, Ds of the sealing or proppant and thus the choice of the diameter Dv of the bonding compound can be done regardless of what diameter Dr the lens blank undergoes during processing or to what diameter the lens blank must be reduced during processing. By means of the bonding compound, the lens blank is supported as far or as wide as possible during the blocking, so that after reduction of the blank diameter Dr to the semifinished product diameter D1, almost 100% support of the semifinished product is ensured.

Vorteilhaft ist hierzu auch , dass der Innendurchmesser Dd, Ds des Dicht- oder Stützmittels in Abhängigkeit eines Durchmessers Dr des Brillenglasrohlings derart gewählt wird, dass der Innendurchmesser Dd, Ds maximal zwischen 1 mm und 20 mm, insbesondere maximal zwischen 2 mm und 6 mm kleiner ist als der Durchmesser Dr des Brillenglasrohlings. Da ein Brillenglasrohling in der Regel eine sehr unregelmäßige Umfangsfläche aufweist, verbleibt als Dichtfläche zum Anlegen des Dichtmittels zwecks Begrenzung des Hohlraums für die Verbindungsmasse lediglich die erste Seite des Brillenglasrohlings. Zudem stellt die vorgefertigte erste Seite eine präzisere Referenzfläche dar. Da zwecks Gewährleistung der Dichtheit zwischen dem Dichtmittel und dem Brillenglasrohling eine minimale Auflagefläche des Dichtmittels an der ersten Seite vorhanden sein sollte, ist mit den vorstehend genannten Maßen für den Innendurchmesser Dd eine weitgehende Unterstützung des Brillenglasrohlings gewährleistet. Entsprechendes gilt für den Einsatz eines Stützmittels mit dem Durchmesser Ds. Die vorgefertigte erste Seite sollte als Referenzfläche für die relative Lage verwendet werden. Dies insbesondere vor dem Hintergrund, dass der Brillenglasrohling ausgehend von seinem Durchmesser Dr wie nachstehend erläutert in einem ersten Bearbeitungsschritt auf einen Durchmesser D1 reduziert wird, um die Unregelmäßigkeiten am Rand zu beseitigen.It is also advantageous for this that the inner diameter Dd, Ds of the sealing or supporting means is selected as a function of a diameter Dr of the lens blank such that the inner diameter Dd, Ds is at most between 1 mm and 20 mm, in particular between 2 mm and 6 mm smaller is the diameter Dr of the lens blank. Since a lens blank usually has a very irregular peripheral surface, remains as a sealing surface for applying the sealant for the purpose of limiting the cavity for the compound mass only the first side of the lens blank. In addition, since the prefabricated first page is a more precise reference surface. Since in order to ensure the tightness between the sealant and the lens blank a minimal contact surface of the sealant on the first side should be present, with the above dimensions for the inner diameter Dd a substantial support of the lens blank guaranteed. The same applies to the use of a support means with the diameter Ds. The prefabricated first side should be used as reference surface for the relative position. This is particularly true against the background that the lens blank, starting from its diameter Dr as explained below in a first Machining step is reduced to a diameter D1, to eliminate the irregularities at the edge.

Demnach kann es vorteilhaft sein, wenn in einem ersten Schritt des Bearbeitungsprozesses ein Rand des Brillenglasrohlings bearbeitet und der Durchmesser Dr auf einen Durchmesser D1 reduziert werden, wobei für den Durchmesser D1 das Maß des Durchmessers Dv oder ein Maß, das höchstens 1 mm bis 6 mm größer ist, vorgesehen wird. Durch die Reduzierung des Brillenglasrohlings auf den Durchmesser D1 wird ein rotationssymmetrisches Bauteil generiert, das die für den weiteren Bearbeitungsprozess notwendige Präzision gewährleistet. Zwecks Gewährleistung einer 100 %-igen Unterstützung sollte der Durchmesser D1 das Maß des Durchmessers Dv der Verbindungsmasse aufweisen. Dies ist jedoch nur möglich, wenn mit Rücksicht auf das endgültig herzustellende Brillenglas eine entsprechende Durchmesserreduzierung des Brillenglasrohlings überhaupt möglich ist. Selbstverständlich ist es in diesem Bearbeitungsschritt auch möglich, sowohl den Brillenglasrohling als auch die Verbindungsmasse wie nachstehend ausgeführt auf einen Durchmesser kleiner als D1 zu reduzieren.Accordingly, it may be advantageous if, in a first step of the machining process, an edge of the lens blank is machined and the diameter Dr is reduced to a diameter D1, wherein for the diameter D1 the dimension of the diameter Dv or a dimension which is at most 1 mm to 6 mm is larger, is provided. By reducing the lens blank to the diameter D1, a rotationally symmetric component is generated, which ensures the precision necessary for the further processing process. To ensure 100% support, the diameter D1 should be the measure of the diameter Dv of the bonding mass. However, this is only possible if, with regard to the spectacle lens to be finally produced, a corresponding diameter reduction of the spectacle lens blank is even possible. Of course, in this processing step, it is also possible to reduce both the lens blank and the bonding compound to a diameter smaller than D1 as set forth below.

Ferner kann es vorteilhaft sein, wenn in einem weiteren Schritt des Bearbeitungsprozesses eine der ersten Seite gegenüberliegende zweite Seite des Brillenglasrohlings spanend oder schleifend bearbeitet wird, wobei vor oder nach dem Bearbeiten der zweiten Seite der Durchmesser Dr, Dv des Brillenglasrohlings bzw. der Rand und ein Durchmesser der Verbindungsmasse abgearbeitet bzw. zerspant oder abgeschliffen werden. Bei der spanenden bzw. schleifenden Bearbeitung des Brillenglasrohlings wird in der Regel unabhängig von der Form des herzustellenden Brillenglases die runde Form des Brillenglasrohlings bzw. des so hergestellten Halbzeugs beibehalten, wobei der Durchmesser Dr wie vorgehend beschrieben auf ein Maß D1 reduziert wird, welches die Herstellung des gewünschten Brillenglases noch gewährleistet. Die runde Form des Halbzeugs wird in der Regel aus zweierlei Gründen beibehalten. Zum einen kann bei dem anschließenden Polierprozess, bei dem das Halbzeug in der Regel auch rotiert, ein unterbrechungsfreier Poliervorgang gewährleistet werden, ohne dass das Polierwerkzeug aufgrund eines rotierenden unsymmetrischen Halbzeugs insbesondere im Randbereich wechselnden Anlagebedingungen unterliegt. Zum anderen entstehen bei dem anschließenden Beschichtungsprozess, insbesondere beim Spinn-Coating, im Randbereich Unregelmäßigkeiten in der Beschichtung, die durch das finale Bearbeiten des Durchmessers des so hergestellten runden Halbzeugs, also die Herstellung der gewünschten unrunden oder kleineren Brillenglasform, abgearbeitet werden.Furthermore, it may be advantageous if, in a further step of the machining process, a second side of the lens blank opposite the first side is machined or ground, wherein before or after the machining of the second side the diameter Dr, Dv of the lens blank or the edge and a Be processed diameter of the compound or machined or ground. In the case of cutting or grinding of the lens blank, the round shape of the lens blank or of the lens thus produced is generally independent of the shape of the lens to be produced Retain semi-finished, wherein the diameter Dr is reduced as described above to a level D1, which still ensures the production of the desired spectacle lens. The round shape of the semi-finished product is usually maintained for two reasons. On the one hand, in the subsequent polishing process, in which the semifinished product usually also rotates, an uninterrupted polishing process can be ensured without the polishing tool being subject to changing investment conditions, in particular in the edge region, due to a rotating asymmetrical semifinished product. On the other hand, in the subsequent coating process, in particular during spin coating, irregularities in the coating occur in the edge region, which are processed by the final machining of the diameter of the round semi-finished product thus produced, ie the production of the desired non-circular or smaller spectacle lens shape.

In Ausnahmefällen kann es vorgesehen werden, dass der Brillenglasrohling während des Schneid- bzw. Spanprozesses nicht nur im Durchmesser auf ein Minimum reduziert wird, sondern auch abweichend von der runden Form eine ovale oder polygone Form erhält. Auch in diesem Fall ist es möglich, nicht nur den runden zentralen Teil des Halbzeugs durch die Verbindungsmasse zu unterstützen, sondern die ganze erste Seite des Brillenglasrohlings bzw. des Halbzeugs, unabhängig von der Form. Die Verbindungsmasse wird mit abgearbeitet.In exceptional cases, it may be provided that the lens blank is not only reduced in diameter to a minimum during the cutting or chip process, but also receives an oval or polygonal shape deviating from the round shape. Also in this case, it is possible to support not only the round central part of the semifinished product by the bonding compound, but the whole first side of the lens blank or the semifinished product, regardless of the shape. The compound is processed with.

Vorteilhaft kann es auch sein, wenn zwischen dem Brillenglasrohling und der Verbindungsmasse eine Schutzschicht vorgesehen wird. Die Schutzschicht wird in der Regel vorab auf dem Brillenglasrohling aufgebracht oder ist bereits auf diesem vorgesehen, damit die vorgefertigte erste Seite nicht beschädigt wird. Der Brillenglasrohling wird also mittelbar über die Schutzschicht von der Verbindungsmasse gehalten.It may also be advantageous if a protective layer is provided between the lens blank and the bonding compound. The protective layer is usually applied in advance on the lens blank or is already provided on this, so that the prefabricated first page is not damaged. The lens blank is so held indirectly over the protective layer of the bonding compound.

Dabei kann es vorteilhafter Weise vorgesehen sein, wenn die Verbindungsmasse über mehrere Einfüllstutzen oder über mehrere Auslassöffnungen eines oder mehrere Einfüllstutzen in den Hohlraum eingebracht wird. Die Einfüllstutzen bzw. die Auslassöffnungen weisen verschiedene Richtungsanteile auf, so dass die Verbindungsmasse nicht nur an verschiedenen Positionen des jeweiligen Einfüllstutzen eingebracht wird, sondern auch innerhalb einer Position eines Einfüllstutzen in verschiedenen Richtungen bzw. mit verschiedenen Richtungsanteilen eingebracht wird. Mit den verschiedenen Positionen der Einfüllstutzen gehen selbstverständlich auch verschiedene Richtungsanteile für die einzubringende Verbindungsmasse einher.In this case, it can be advantageously provided that the connecting compound is introduced into the cavity via a plurality of filler neck or via a plurality of outlet openings of one or more filler neck. The filler neck or the outlet openings have different directional components, so that the bonding compound is not only introduced at different positions of the respective filler neck, but is also introduced within a position of a filler neck in different directions or with different directional components. Of course, with the various positions of the filler neck also different directional shares go for the compound mass to be introduced.

Hierbei kann es vorteilhafter Weise vorgesehen sein, wennder Füllstand der Verbindungsmasse innerhalb des Hohlraums mittels eines Laser-Distanzsensors überwacht wird. Andere Füllstandsysteme funktionieren weniger gut. Der Laser-Distanzsensor weist den notwendigen Fokus auf, um von außerhalb den Füllstand in der Einfüllöffnung zu erfassen. Je nach Verbindungsmasse können reflektierende Zusatzstoffe vorgesehen sein, die die Erkennung des Füllstandes mittels des Laser-Distanzsensors insbesondere bei klaren Verbindungsmassen gewährleisten.In this case, it can be advantageously provided that the filling level of the bonding compound within the cavity is monitored by means of a laser distance sensor. Other level systems work less well. The laser distance sensor has the necessary focus to detect from outside the level in the filling opening. Depending on the compound mass reflective additives can be provided which ensure the detection of the level by means of the laser distance sensor, especially with clear compound masses.

Alternativ kann die Verbindungsmasse vorportioniert auf das Blockstück aufgebracht werden und anschließend der Brillenglasrohling aufgesetzt und/oder aufgedrückt werden, wobei die Verbindungsmasse an den Brillenglasrohling angeformt wird. Damit ist ein Abdichten und Eingießen der Verbindungsmasse nicht mehr notwendig. Die Verbindungsmasse wird nach dem Anformen an den Rohling ausgehärtet, so dass die notwendige Haltekraft entwickelt wird.Alternatively, the compound compound can be applied in a pre-portioned manner to the block piece, and then the lens blank can be placed on and / or pressed on, the compound compound being molded onto the lens blank. This sealing and pouring the compound is no longer necessary. The connecting mass is cured after molding to the blank, so that the necessary holding force is developed.

Die Aufgabe wird auch gelöst durch einen Brillenglasrohling mit einem Durchmesser Dr, der über abgegossene Verbindungsmasse an einem Blockstück befestigt ist, wobei die Verbindungsmasse einen äußeren Durchmesser Dv aufweist, und der Durchmesser Dv höchstens 2 mm bis 6 mm, insbesondere höchstens 4 mm kleiner ist als der Durchmesser Dr. Der Durchmesser Dv der Verbindungsmasse wird zum Zwecke einer maximalen Unterstützung des Rohlings maximiert, wobei ein Überstand des Rohlings über die Verbindungsmasse zwecks Anlage des Dichtmittels bzw. Blockrings notwendig ist.The object is also achieved by a lens blank having a diameter Dr, which is attached via abgege cast compound to a block piece, wherein the compound mass has an outer diameter Dv, and the diameter Dv is at most 2 mm to 6 mm, in particular at most 4 mm smaller than the diameter Dr. The diameter Dv of the bonding compound is maximized for the purpose of maximum support of the blank, with a projection of the blank over the bonding compound for the purpose of conditioning the sealant or block ring is necessary.

Der Durchmesser Dv ist etwa 2 mm kleiner als der Durchmesser Dr, so dass sich für den Durchmesser Dv in Abhängigkeit von dem Durchmesser Dr folgende Werte ergeben. Dr [mm] 65 70 75 80 85 90 Dv [mm] 63 68 73 78 83 88 Dv [mm] 61 66 71 76 81 86 The diameter Dv is about 2 mm smaller than the diameter Dr, so that the following values result for the diameter Dv as a function of the diameter Dr. Dr [mm] 65 70 75 80 85 90 Dv [mm] 63 68 73 78 83 88 Dv [mm] 61 66 71 76 81 86

Der Wert des Durchmessers Dv hängt von dem für die Abdichtung bzw. die Anlage des Dichtmittels notwendigen Platzbedarf ab. In der vorstehenden Tabelle sind für den Platzbedarf zunächst 1 mm und in der letzten Zeile 2 mm berücksichtigt. Der entsprechende Unterschied der Durchmesser Dr und Dv beträgt somit 2 mm respektive 4 mm.The value of the diameter Dv depends on the space required for the sealing or the installation of the sealant. In the above table, the space requirement is taken into account initially 1 mm and in the last line 2 mm. The corresponding difference between the diameters Dr and Dv is thus 2 mm or 4 mm respectively.

Zudem kann es vorteilhaft sein, wenn das Blockstück eine mit Bezug zur Mittelachse in axialer Richtung wirkende Anlagefläche aufweist und zum Aufnehmen in ein Spannfutter der Bearbeitungsmaschine mit der Anlagefläche in axialer Richtung gegen das Spannfutter zur Anlage bringbar ist. Somit ist eine präzise Einspannung des Blockstücks gewährleistet, wodurch die Bearbeitung insgesamt weiter optimiert wird. Diese Anlagefläche wurde bisher mittels der Verbindungsmasse an das Blockstück angegossen.In addition, it may be advantageous if the block piece has a bearing surface which acts in the axial direction with respect to the central axis has and for receiving in a chuck of the processing machine with the contact surface in the axial direction against the chuck for conditioning can be brought. Thus, a precise clamping of the block piece is ensured, whereby the processing is further optimized on the whole. This contact surface was previously cast by means of the compound compound to the block piece.

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

Figur 1
eine Schnittdarstellung eines Blockstücks mit aufgelegtem Brillenglasrohling in einer Blockstation;
Figur 2
den Brillenglasrohling mit angeblocktem Blockstück;
Figur 3a
eine Prinzipskizze des Brillenglasrohlings mit Dichtmittel und Verbindungsmasse;
Figur 3b
eine Prinzipskizze des Brillenglasrohlings mit Stützmittel und Verbindungsmasse;
Figur 4a
eine Prinzipskizze des Brillenglasrohlings mit Dichtmittel und Einfüllstutzen;
Figur 4b
eine Prinzipskizze des Brillenglasrohlings mit Dichtmittel und weiteren Einfüllstutzenvarianten.
Further advantages and details of the invention are explained in the patent claims and in the description and illustrated in the figures. Show it:
FIG. 1
a sectional view of a block piece with applied lens blank in a block station;
FIG. 2
the lens blank with block block blocked;
FIG. 3a
a schematic diagram of the lens blank with sealant and bonding compound;
FIG. 3b
a schematic diagram of the lens blank with support means and compound compound;
FIG. 4a
a schematic diagram of the lens blank with sealant and filler neck;
FIG. 4b
a schematic diagram of the lens blank with sealant and other filler neck variants.

Zum Aufblocken eines Brillenglasrohlings 1 auf ein Blockstück 2 werden sowohl das Blockstück 2 als auch der Brilleglasrohling 1 in einer teilweise dargestellte Aufblockmaschine 7 platziert. Die Aufblockmaschine 7 weist eine Aufnahmekalotte 7.2 auf, in die das Blockstück 2 eingesetzt wird. Zwecks Ausrichtung des Blockstücks 2 bzw. der Aufnahmekalotte 7.2 relativ zum Brillenglasrohling 1 ist eine Führungskalotte 7.7 vorgesehen, die über einen Schwenkteller 7.3 in der Aufblockmaschine 7 gelagert ist. Der Schwenkteller 7.3 weist neben verschiedenen anderen Getriebegliedern auch eine Drehachse 7.4 auf. Zum späteren Ausstoßen des Blockstücks ist ein Ausstoßer 7.6 vorgesehen.For blocking a lens blank 1 on a block piece 2, both the block piece 2 and the spectacle glass blank 1 are placed in a block machine 7 partially shown. The blocking machine 7 has a receiving dome 7.2 into which the block piece 2 is inserted. For the purpose of alignment of the block piece 2 or the Reception dome 7.2 relative to the lens blank 1, a guide dome 7.7 is provided, which is mounted on a swivel plate 7.3 in the blocker machine 7. The swivel plate 7.3, in addition to various other gear members also has a rotation axis 7.4. For later ejection of the block piece an ejector 7.6 is provided.

Der aufzublockende Brillenglasrohling 1 wird über dem Blockstück 2 platziert, wobei zwecks Gewährleistung eines durch Verbindungsmasse 3 zu füllenden Hohlraums 5 ein als Dichtmittel 4 ausgebildeter Blockring sowie die Führungskalotte 7.7 zwischen dem Brillenglasrohling 1 und dem Blockstück 2 bzw. der Aufnahmekalotte 7.2 platziert werden. Der Blockring 4 dichtet somit gegenüber dem Brillenglasrohling 1 bzw. seiner ersten unteren Seite 1.1 sowie gegenüber der Führungskalotte 7.7 ab. Die Führungskalotte 7.7 dichtet gegenüber der Aufnahmekalotte 7.2 ab, während die Aufnahmekalotte 7.2 gegenüber dem Blockstück 2 abdichtet.The spectacle lens blank 1 to be lifted is placed over the block piece 2, whereby a block ring formed as a sealing means 4 and the guide dome 7.7 between the spectacle lens blank 1 and the block piece 2 or the receiving dome 7.2 are placed in order to ensure a cavity 5 to be filled by bonding compound 3. The block ring 4 thus seals against the lens blank 1 or its first lower side 1.1 and against the guide dome 7.7. The guide dome 7.7 seals against the receiving dome 7.2, while the receiving dome 7.2 seals against the block piece 2.

Innerhalb des Blockrings 4 ist eine Einfüllöffnung 4.1 vorgesehen. Im Bereich der Einfüllöffnung 4.1 ist ein zylindrischer bzw. ovaler Einfüllstutzen 7.5 der Aufblockmaschine 7 angeordnet, über den flüssige Verbindungsmasse 3 in den Hohlraum 5 eingefüllt wird. Der Einfüllstutzen 7.5 ist mit Bezug in Richtung der Einströmrichtung beweglich. Mithin ist ein Abstand zwischen dem Einfüllstutzen 7.5 und der Einfüllöffnung 4.1 zwecks verbesserter Einbringung veränderbar. Zudem ist hinter dem Einfüllstutzen 7.5 ein Laser-Distanzsensor 9 vorgesehen, über den der Füllstand in der Einfüllöffnung 4.1 überwacht wird. Ein Messstrahl 9.1 wird seitlich eingebracht und verläuft im Betrieb in etwa in einer Ebene der Mittelachse des Einfüllstutzens 7.5. Zwecks Gewährleistung der Position des Brillenglasrohlings 1 sowie der Dichtheit weist die Aufblockmaschine 7 einen Halter 7.1 auf, der den Brillenglasrohling 1 in axialer Richtung gegen das Dichtmittel bzw. den Blockring 4 vorspannt.Within the block ring 4, a filling opening 4.1 is provided. In the region of the filling opening 4.1, a cylindrical or oval filler neck 7.5 of the blocking machine 7 is arranged, via which liquid compound compound 3 is introduced into the cavity 5. The filler neck 7.5 is movable with respect to the inflow direction. Thus, a distance between the filler neck 7.5 and the filling opening 4.1 is changeable for the purpose of improved introduction. In addition, behind the filler neck 7.5, a laser distance sensor 9 is provided, via which the fill level in the filling opening 4.1 is monitored. A measuring beam 9.1 is introduced laterally and extends in operation approximately in a plane of the central axis of the filler neck 7.5. In order to ensure the position of the spectacle lens blank 1 and the tightness, the blocking machine 7 a holder 7.1, which biases the lens blank 1 in the axial direction against the sealant or the block ring 4.

Der Brillenglasrohling 1, das Blockstück 2 sowie der Blockring 4 mit der Einfüllöffnung 4.1 sind in der Aufblockmaschine 7 gegenüber der Vertikalen in einem Winkel α von etwa 20° angestellt. Die Verbindungsmasse 3 tritt also aus dem Einfüllstutzen 7.5 durch die Einfüllöffnung 4.1 in den in dem Winkel α angestellten Hohlraum 5 ein, wodurch dieser von unten nach oben befüllt wird.The lens blank 1, the block piece 2 and the block ring 4 with the filling opening 4.1 are employed in the blocking machine 7 relative to the vertical at an angle α of about 20 °. The bonding compound 3 thus enters from the filler neck 7.5 through the filling opening 4.1 in the angled at the angle α cavity 5, whereby it is filled from bottom to top.

Nach Befüllen des Hohlraumes 5 und nach Erkalten der Verbindungsmasse 3 wird die Baugruppe gemäß Figur 2, bestehend aus dem Brillenglasrohling 1, dem Blockstück 2 und der beide verbindenden erkalteten Verbindungsmasse 3, mittels des Ausstoßers 7.6 aus der Aufblockmaschine 7 entfernt.After filling the cavity 5 and after cooling of the bonding compound 3, the assembly according to FIG. 2 consisting of the lens blank 1, the block piece 2 and the connecting connecting compound 3 connecting the two, by means of the ejector 7.6 removed from the blocking machine 7.

Ausgehend von dem Innendurchmesser Dd des Blockrings 4 weist die Verbindungsmasse 3 einen Durchmesser Dv auf, der etwas kleiner ist als der Durchmesser Dr des Brillenglasrohlings 1. Zwecks Herstellung der Rotationssymmetrie wird der Brillenglasrohling 1 in der Regel in einem ersten Bearbeitungsschritt auf einen Durchmesser D1 reduziert, wobei der verbleibende Unterschied zwischen dem Durchmesser D1 und dem Durchmesser Dv der Verbindungsmasse 3 erfindungsgemäß möglichst klein sein sollte, damit eine möglichst große Unterstützung des Brillenglasrohlings 1 durch die Verbindungsmasse 3 gewährleistet ist. In einem weiteren Bearbeitungsschritt werden der Rand 1.3 und/oder eine zweite Seite 1.2 des Brillenglasrohlings 1 sowie die Verbindungsmasse 3 bearbeitet.Starting from the inner diameter Dd of the block ring 4, the connecting compound 3 has a diameter Dv which is slightly smaller than the diameter Dr of the lens blank 1. For the purpose of producing rotational symmetry, the lens blank 1 is usually reduced to a diameter D1 in a first processing step, wherein the remaining difference between the diameter D1 and the diameter Dv of the connecting mass 3 according to the invention should be as small as possible so that the largest possible support of the lens blank 1 is ensured by the bonding compound 3. In a further processing step, the edge 1.3 and / or a second side 1.2 of the lens blank 1 and the bonding compound 3 are processed.

Das Blockstück 2 weist eine erste Ausnehmung 2.1 auf, die mit einer nicht dargestellten Nase einer Maschinenaufnahme zwecks Gewährleistung einer Orientierung in Wirkverbindung bringbar ist. Daneben ist eine nicht dargestellte Ausnehmung vorgesehen, die der Übertragung eines Drehmomentes dient. Ferner weist das Blockstück 2 eine axiale Anlagefläche 2.2 auf, die angrenzend an eine zylindrische Spannfläche 2.3 vorgesehen ist. Zudem weist das Blockstück 2 eine weitere Hinterschneidung 2.4 auf, die eine in axialer Richtung wirkende formschlüssige Verbindung zwischen der Verbindungsmasse 3 und dem Blockstück 2 gewährleistet.The block piece 2 has a first recess 2.1, which with a not shown nose of a machine holder in order to ensure orientation in operative connection can be brought. In addition, a recess, not shown, is provided which serves to transmit a torque. Furthermore, the block piece 2 has an axial contact surface 2.2, which is provided adjacent to a cylindrical clamping surface 2.3. In addition, the block piece 2 has a further undercut 2.4, which ensures an acting in the axial direction positive connection between the connecting mass 3 and the block piece 2.

Ein in Figur 2 dargestelltes Spannfutter 8 einer Werkzeugmaschine ist also in radialer Richtung gegen die zylindrische Spannfläche 2.3 und in axialer Richtung gegen die axiale Anschlagfläche 2.2 anlegbar. Die relative Lage zwischen dem Blockstück 2 und dem Spannfutter 8 unterliegt somit keinen Einflüssen, die auf die Verbindungsmasse 3 zurückzuführen sind.An in FIG. 2 represented chuck 8 a machine tool is thus in the radial direction against the cylindrical clamping surface 2.3 and in the axial direction against the axial stop surface 2.2 can be applied. The relative position between the block piece 2 and the chuck 8 is thus subject to no influences, which are due to the compound mass 3.

Gemäß Figur 3a weist das Dichtmittel 4 den Innendurchmesser Dd auf, der dem Durchmesser Dv der Verbindungsmasse 3 entspricht. Der Innendurchmesser Dd bzw. der Durchmesser Dv ist kleiner als der Durchmesser Dr des Brillenglasrohlings 1, da das Dichtmittel 4 gegen die erste Seite 1.1 des Brillenglasrohlings 1 anliegen muss.According to FIG. 3a the sealing means 4 has the inner diameter Dd, which corresponds to the diameter Dv of the connecting compound 3. The inner diameter Dd or the diameter Dv is smaller than the diameter Dr of the lens blank 1, since the sealant 4 must abut against the first side 1.1 of the lens blank 1.

In Figur 3b ist alternativ der Einsatz eines Stützmittels 4 dargestellt, das drei Stützpunkte 4a, 4b, 4c aufweist, gegen die die erste Seite 1.1 des Brillenglasrohlings 1 zwecks Bestimmung der relativen Lage anliegen muss. Die Verbindungsmasse 3 wird beim Auflegen bzw. Andrücken des Brillenglasrohlings 1 angeformt und breitet sich radial nach außen aus. Das Stützmittel 4 weist einen entsprechenden Durchmesser Ds auf, der durch die drei Stützpunkte 4a, 4b, 4c bestimmt ist. Der effektiv zur Verfügung stehende Durchmesser Dv entspricht zumindest dem Durchmesser Ds. In dem Bereich zwischen den drei Stützpunkten 4a, 4b, 4c ist der effektive Durchmesser der Verbindungsmasse 3 sogar größer, jedoch nur über Teile des Umfangs. Eine stetige Unterstützung ist über den Durchmesser Ds gegeben.In FIG. 3b Alternatively, the use of a support means 4 is shown, which has three support points 4a, 4b, 4c, against which the first side 1.1 of the lens blank 1 must be present for the purpose of determining the relative position. The compound compound 3 is formed when placing or pressing the lens blank 1 and spreads radially outward. The support means 4 has a corresponding diameter Ds, which is determined by the three support points 4a, 4b, 4c. The effectively available Diameter Dv corresponds at least to the diameter Ds. In the region between the three support points 4a, 4b, 4c, the effective diameter of the connecting mass 3 is even greater, but only over parts of the circumference. A steady support is given about the diameter Ds.

Nach Figur 4a läuft der Einfüllstutzen 7.5 im Unterschied zu dem gemäß Ausführungsbeispiel 1 V-förmig aus und weist zwei Auslassöffnungen 7.51, 7.52 auf, die in einem Winkel von etwa 30° zueinander angeordnet sind. Die Auslassöffnungen 7.51, 7.52 können rund oder oval sein. Die einströmende Verbindungsmasse 3 wird mit verschiedenen Richtungsanteilen, also sowohl zur rechten als auch zur linken Seite abgegeben, so dass eine gleichmäßigere und schnellere Verteilung der Verbindungsmasse 3 innerhalb des Hohlraums 5 gewährleitet ist.To FIG. 4a Runs the filler neck 7.5 in contrast to that according to embodiment 1 V-shaped and has two outlet 7.51, 7.52, which are arranged at an angle of about 30 ° to each other. The outlet openings 7.51, 7.52 can be round or oval. The inflowing compound compound 3 is delivered with different directional components, ie both to the right and to the left side, so that a more uniform and faster distribution of the compound mass 3 within the cavity 5 is guaran teed.

Ergänzend (oder auch alternativ, nicht dargestellt) ist ein zentrisch zum Brillenglasrohling 1 bzw. zum Blockring 4 angeordneter Einfüllstutzen 7.5' vorgesehen, über den aus der Mitte heraus Verbindungsmasse 3 in den Hohlraum 5 eingebracht werden kann.In addition (or alternatively, not shown) is a centrally arranged to the lens blank 1 and the block ring 4 filler neck 7.5 'is provided, can be introduced from the center out of the compound compound 3 in the cavity 5.

Gemäß Ausführungsbeispiel Figur 4b ist gegenüberliegend zum Einfüllstutzen 7.5 ein weiterer Einfüllstutzen 7.5'' vorgesehen, über den zusätzlich oder auch alternativ (nicht dargestellt) von unten Verbindungsmasse 3 in den Hohlraum 5 eingebracht werden kann. Der Einfüllstutzen 7.5" ist wie im Ausführungsbeispiel nach Figur 1 V-förmig ausgebildet. Die Auslassöffnungen 7.51, 7.52 können rund oder oval sein.According to embodiment FIG. 4b is opposite the filler neck 7.5, a further filler neck 7.5 '' provided over the additional or alternatively (not shown) from below compound compound 3 can be introduced into the cavity 5. The filler neck 7.5 "is as in the embodiment according to FIG. 1 V-shaped. The outlet openings 7.51, 7.52 can be round or oval.

Der zentrisch angeordnete Einfüllstutzen 7.5' ist in diesem Ausführungsbeispiel ebenfalls V-förmig ausgebildet, so dass die Verbindungsmasse 3 über zwei Auslassöffnungen 7.53, 7.54 mit verschiedenen Richtungsanteilen abgegeben wird.The centrally arranged filler neck 7.5 'is also V-shaped in this embodiment, so that the connecting compound 3 is discharged via two outlet openings 7.53, 7.54 with different directional components.

Die in den Ausführungsbeispielen Figur 4a, 4b dargestellten Einfüllstutzen 7.5, 7.5', 7.5" sind sowohl der Position als auch der Ausführung nach, also zylindrisch oder V-förmig, in jeglicher Kombination einsetzbar.The in the embodiments Figure 4a, 4b shown filler neck 7.5, 7.5 ', 7.5 "are both the position and the execution, ie cylindrical or V-shaped, can be used in any combination.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11 BrillenglasrohlingLens blank 1.11.1 erste Seitefirst page 1.21.2 zweite Seitesecond page 1.31.3 Randedge 22 Blockstückblock piece 2.12.1 Ausnehmung für NaseRecess for nose 2.22.2 Anlagefläche, axialContact surface, axial 2.32.3 zylindrische Spannflächecylindrical clamping surface 2.42.4 Hinterschneidungundercut 33 Verbindungsmasseconnecting material 44 Dicht- oder Stützmittel, BlockringSealing or support means, block ring 4a4a Stützpunktbase 4b4b Stützpunktbase 4c4c Stützpunktbase 4.14.1 Einfüllöffnungfill opening 55 Hohlraumcavity 66 Mittelachsecentral axis 77 AufblockmaschineAufblockmaschine 7.17.1 Halterholder 7.27.2 AufnahmekalotteAufnahmekalotte 7.37.3 Schwenktellerpivoting disc 7.47.4 Drehachseaxis of rotation 7.57.5 Einfüllstutzenfiller pipe 7.5'7.5 ' Einfüllstutzenfiller pipe 7.5''7.5 '' Einfüllstutzenfiller pipe 7.517:51 Auslassöffnungoutlet 7.527:52 Auslassöffnungoutlet 7.537:53 Auslassöffnungoutlet 7.547:54 Auslassöffnungoutlet 7.67.6 Ausstoßerejector 7.77.7 FührungskalotteFührungskalotte 88th Spannfutterchuck 99 Laser-DistanzsensorLaser Distance Sensor Dddd Innendurchmesser Dichtmittel = DvInner diameter sealant = Dv Dsds Innendurchmesser Stützmittel = DvInner diameter of support = Dv Dvdv Breite bzw. Außendurchmesser Verbindungsmasse = DdWidth or outer diameter Connection mass = Dd DrDr Durchmesser RohlingDiameter blank D1D1 Durchmesser Rohling reduziertα WinkelDiameter blank reduces α angle

Claims (11)

  1. A machining method for a spectacle lens blank (1), where a block-shaped piece (2) for holding and supporting the spectacle lens blank (1) in a processing machine is connected to a first side (1.1) of the spectacle lens blank (1) by means of a connective substance (3), wherein for this purpose,
    a) a cavity (5) is defined between the block-shaped piece (2) and the first side (1.1) using at least a sealing or support means (4), wherein the sealing or support means (4) has an inner diameter Dd, Ds and is positioned so as to abut the first side (1.1),
    b) the connective substance (3) is filled into the cavity (5) or connective substance is present in the cavity (5) and the connective substance (3) is subsequently cured,
    c) the spectacle lens blank (1) is placed in a milling machine and/or lathe or a grinding machine using the block-shaped piece (2) affixed by means of the connective substance (3), wherein the spectacle lens blank (1) is supported by the connective substance (3) on the first side (1.1) over a diameter Dv corresponding to the diameter Dd, Ds,
    characterized in that
    d) in one of the following machining processes, the blank (1) and the connective substance (3) are reduced in size.
  2. The method according to claim 1,
    characterized in that
    the inner diameter Dd, Ds of the sealing means (3) is selected in accordance with a diameter Dr of the spectacle lens blank (1), in such a manner that the inner diameter Dd, Ds is smaller than the diameter Dr of the spectacle lens blank (1) by a maximum ranging between 1 mm and 20 mm, in particular between 2 mm and 6 mm.
  3. The method according to claim 1 or 2,
    characterized in that
    in a first step of the machining process, an edge (1.3) of the spectacle lens blank (1) is machined and the diameter Dr is reduced to a diameter D1, wherein the size preset for the diameter D1 is the size of the diameter Dv or a size exceeding the diameter Dv by not more than 1 mm to 6 mm.
  4. The method according to any one of the preceding claims,
    characterized in that
    in another step of the machining process, a second side (1.2) of the spectacle lens blank (1), which is opposite the first side (1.1), is shaped by removing material or is ground, wherein the edge (1.3) of the spectacle lens blank (1) and the connective substance (3) are reduced in size before or after machining the second side (1.2).
  5. The method according to any one of the preceding claims,
    characterized in that
    a protective layer is provided between the spectacle lens blank (1) and the connective substance (3).
  6. The method according to any one of the preceding claims,
    characterized in that
    the connective substance (3) is introduced in the cavity (5) through several short feed pipes (7.5, 7.5', 7.5") or through several outlet openings (7.51 - 7.54) of one or more short feed pipe(s) (7.5, 7.5', 7.5").
  7. The method according to any one of the preceding claims,
    characterized in that
    the level of the connective substance (3) inside the cavity (5) is monitored by means of a laser distance sensor.
  8. The method according to any one of the preceding claims,
    characterized in that
    a predefined portion of the connective substance (3) is applied to the block-shaped piece (2) and the spectacle lens blank (1) is subsequently placed and/or pressed thereon, thus shaping the connective substance (3) so as to adapt and adhere to the spectacle lens blank (1).
  9. A unit including a spectacle lens blank (1), a block-shaped piece (2) and connective substance (3), wherein the spectacle lens blank (1), which is made of plastic and has a diameter Dr, is affixed to a block-shaped piece (2) my means of the cast connective substance (3), wherein the connective substance (3) has an outer diameter Dv,
    characterized in that
    the block-shaped piece (2) is arranged at a distance from the spectacle lens blank (1) and the diameter Dv is smaller than the diameter Dr by not more than 2 mm to 6 mm, in particular 4 mm.
  10. The unit according to claim 9,
    characterized in that
    the diameter Dv at least has a value ranging between 60 mm and 90 mm, in particular 61 mm, 63 mm, 66 mm, 68 mm, 71 mm, 73 mm, 76 mm, 78 mm, 81 mm, 83 mm, 86 mm or 88 mm.
  11. The unit according to claim 9 or 10,
    characterized in that
    the block-shaped piece (2) has a contact surface (2.2) acting in the axial direction defined by the central axis (6) and, for the purpose of being held in a chuck (8) of the processing machine, can be positioned in such a manner that the contact surface (2.2) abuts the chuck (8) in the axial direction.
EP09742138.2A 2008-05-07 2009-05-07 Method for machining an eyeglass lens blank and eyeglass lens blank comprising a connecting material and block piece Active EP2293900B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008022660A DE102008022660A1 (en) 2008-05-07 2008-05-07 A method of processing a lens blank and lens blank with bonding compound and block piece
PCT/EP2009/055567 WO2009135920A1 (en) 2008-05-07 2009-05-07 Method for machining an eyeglass lens blank and eyeglass lens blank comprising a connecting material and block piece

Publications (2)

Publication Number Publication Date
EP2293900A1 EP2293900A1 (en) 2011-03-16
EP2293900B1 true EP2293900B1 (en) 2013-06-19

Family

ID=41056912

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09742138.2A Active EP2293900B1 (en) 2008-05-07 2009-05-07 Method for machining an eyeglass lens blank and eyeglass lens blank comprising a connecting material and block piece

Country Status (7)

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US (1) US8684525B2 (en)
EP (1) EP2293900B1 (en)
CN (1) CN102015208B (en)
BR (1) BRPI0908291A2 (en)
DE (1) DE102008022660A1 (en)
MX (1) MX2010012082A (en)
WO (1) WO2009135920A1 (en)

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EP2455186A1 (en) 2010-11-17 2012-05-23 Schneider GmbH & Co. KG Device and method for processing an optical lens with automatic identification of the optical lens
CN103237625B (en) 2010-10-04 2017-03-08 施耐德两合公司 Equipment for processing optical lens and method and the transport box for optical lenses
EP2455187A1 (en) 2010-11-23 2012-05-23 Schneider GmbH & Co. KG Method and device for processing an optical lens
EP2455188B1 (en) 2010-11-23 2019-11-20 Schneider GmbH & Co. KG Method and device for blocking a lens
US20130303060A1 (en) * 2010-11-26 2013-11-14 Schneider Gmbh & Co. Kg Block piece
FR2974529B1 (en) * 2011-04-26 2013-06-14 Essilor Int DEVICE FOR GLANTAGE OF AN OPHTHALMIC LENS
JP5899978B2 (en) * 2012-02-03 2016-04-06 株式会社ニデック Eyeglass lens processing equipment
US9168628B2 (en) 2012-11-21 2015-10-27 Schneider GmbH & Co, KG Device for blocking a lens
CN105163904B (en) * 2013-04-29 2018-02-09 埃西勒国际通用光学公司 Blockade computing module
EP3415273B1 (en) * 2017-06-12 2024-01-24 Essilor International Device for adhesively blocking a semi-finished optical element
EP3470172B1 (en) * 2017-10-13 2020-09-16 Essilor International Method of optimizing a support material for an operation of surfacing of a lens blank
CN113732368B (en) * 2021-08-23 2022-10-11 芜湖智一金属制品有限公司 Lens milling machine

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US1952373A (en) * 1924-04-10 1934-03-27 American Optical Corp Lens blocking device
CN1020077C (en) * 1991-06-26 1993-03-17 广州宝石轴承厂 Technology for processing miniature ultra-thin glass amplifier
FR2733710B1 (en) 1995-05-03 1997-07-18 Essilor Int PRE-KNOB FOR GLANTAGE OF AN OPTICAL LENS, AND METHOD FOR IMPLEMENTING SAME
DE69621625T2 (en) 1995-09-18 2003-01-02 Minnesota Mining & Mfg THERMOPLASTIC LENS HOLDING MATERIAL
JPH11198014A (en) 1998-01-09 1999-07-27 Seiko Epson Corp Manufacture of plastic lens
FR2836409B1 (en) 2002-02-26 2004-05-28 Essilor Int METHOD FOR APPLYING A GRIP BLOCK ON A SEMI-FINISHED OPHTHALMIC LENS BLANK
DE10304388B4 (en) * 2003-02-03 2020-10-29 Schneider Gmbh & Co. Kg Machinable block piece
DE102005038063A1 (en) * 2005-08-10 2007-02-15 Schneider Gmbh + Co. Kg Preformed block piece with three support points
ES2368349T5 (en) 2007-07-05 2021-09-17 Satisloh Ag Procedure for blocking a lens blank, adhesive composition and use of the latter for blocking the lenses
EP2105782A1 (en) * 2008-03-25 2009-09-30 Wilhelm Anger Method and device for processing coated spectacles

Also Published As

Publication number Publication date
MX2010012082A (en) 2011-04-11
US8684525B2 (en) 2014-04-01
BRPI0908291A2 (en) 2015-07-21
DE102008022660A1 (en) 2009-11-12
EP2293900A1 (en) 2011-03-16
CN102015208B (en) 2015-05-06
CN102015208A (en) 2011-04-13
WO2009135920A1 (en) 2009-11-12
US20110096290A1 (en) 2011-04-28

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