Device for retaining an optical workpiece for processing / treatment thereof and method for retaining an optical workpiece at such a device

Abstract

A device (10) for receiving, in particular, a prismatic spectacle lens (12) on a workpiece surface (14) for machining / treatment of the other workpiece surface (16) comprises lower and upper parts (20, 22). The lower part has a base (24) with a mounting interface (26) and a wedge section (28) transverse to the base axis (BA). The upper part comprises a spectacle lens receiving section (30) and a wedge section (32) transverse to the receiving axis (AA). The lower part and upper part, with their wedge sections facing each other, are rotatable about a rotation axis (DA) inclined with respect to the base and receiving axes in order to tilt the receiving section and the base relative to each other.A wedge orientation arrangement comprises an orientation aid (34) on the upper part and / or a stop (36) between the upper and lower parts for determining / fixing a rotational angular position of the upper part about the base axis. This stop defines a relative rotational angular end position of the upper and lower parts, corresponding to a minimum or maximum tilting of the receiving section with respect to the base. The outer and inner vacuum chambers of the device can be evacuated together to couple the lower part, upper part, and spectacle lens.

Description

TECHNICAL FIELD

[0001] The present invention relates generally to a device for holding an optical workpiece on a first of two opposing workpiece surfaces for machining or treatment of the optical workpiece on a second of the workpiece surfaces, according to the preamble of patent claim 1. Furthermore, the invention relates generally to a method for holding an optical workpiece with a first of two opposing workpiece surfaces on a holding device for machining or treatment of the optical workpiece on a second of the workpiece surfaces, according to patent claim 14. In particular, the invention relates to a device for holding and a method for holding a spectacle lens for its surface machining or treatment, as occurs on a very large scale in so-called "RX workshops", i.e. production facilities for the manufacture of individual spectacle lenses according to an ophthalmologist's prescription.Surface processing can be, for example, "polishing", while surface treatment can be "marking", as will be described in more detail below. STATE OF THE ART

[0002] The publication DE 10 2021 004 831 A1 already describes in detail which process steps are typically performed during the industrial production of ophthalmic lenses in prescription workshops. Therefore, the usual procedure will only be briefly outlined here; otherwise, for the conventional procedure and further printed prior art, reference is expressly made to the aforementioned publication. The starting product in the industrial production of ophthalmic lenses is a semi-finished ophthalmic lens blank, also called a "blank," which has one pre-formed optically effective surface and is to be machined into a finished ophthalmic lens on its other optically effective surface and the edge between the optically effective surfaces.

[0003] After protecting the preformed optically effective surface with a protective film or protective lacquer, the respective ophthalmic lens blank is "blocked" and bonded to a suitable, so-called "block piece." During blocking, the ophthalmic lens blank and block piece, each with a known or measured geometry, are positioned relative to each other so that the block piece assumes a predetermined position relative to the protected, preformed surface of the ophthalmic lens blank. This set position is then fixed by filling the space between the block piece and the ophthalmic lens blank with a conventional molten material (metallic "alloy" or wax) or, alternatively, with a suitable plastic or adhesive. After solidification or curing, the block piece is bonded to the ophthalmic lens blank.Once this filling material has hardened, the block piece represents a holder or machine interface for machining the ophthalmic lens blank, which subsequently remains on the ophthalmic lens during several machining processes in different machines in order to be able to drive the latter, in particular in a rotating manner, and to reliably hold it in a constantly defined position.

[0004] In the next step, the so-called "generation," the previously unmachined optically effective surface of the respective ophthalmic lens blank receives its macrogeometry, i.e., the optically active shape according to the prescription, in a special processing machine, also called a "generator." It undergoes machining (pre-)processing. For example, if the lens material is plastic, this is usually milling and / or turning with a geometrically defined cutting edge; for example, if the lens material is mineral glass, this is usually grinding with a geometrically undefined cutting edge. The blocked ophthalmic lens blank is held by the block piece on a rotating workpiece spindle, while the edge is first pre-machined and then the surface is machined.

[0005] This is followed by the (micro)machining fine machining of the spectacle lenses, commonly referred to as "polishing," in which the pre-machined, optically effective surface of the respective semi-finished product is given the desired microgeometry (surface quality) using a geometrically undefined cutting edge. For this purpose, the pre-machined, blocked semi-finished product is removed from the generator and further processed in a fine machining or polishing machine. The block piece is also used to position and fix the semi-finished product in the polishing machine, as well as to rotate it if necessary. During polishing, a liquid polishing agent containing abrasive particles is added and a usually flexible polishing tool or disc is moved in defined paths over the pre-machined surface to reduce surface roughness.

[0006] The next optional process step involves "marking" the semi-finished product. Two small circles are created on the back of the semi-finished product, either using a laser beam or mechanically using an engraving tool. This is necessary, for example, for free-form surfaces, in order to reliably locate the position of the semi-finished product in subsequent process steps using the applied markings. Since a relatively high level of positioning accuracy is required here, the block piece is also used for positioning and fixation during the marking process.

[0007] Only after this processing is the semi-finished product separated from the block. In the case of the aforementioned adhesive bond, for example, the so-called "unblocking" is carried out by a high-pressure water jet emitted from a nozzle, which impinges on an edge between the block and the semi-finished product, applying hydraulic forces to separate the semi-finished product from the block. The processed semi-finished product is then available individually, and the separated block is cleaned and returned to the blocking process step.

[0008] In further processing, the semi-finished product is optionally coated on its front and / or back side after cleaning to achieve additional effects - increased scratch resistance through hard coating, anti-reflective properties, color, mirroring, hydrophobic properties, etc.

[0009] The final process step is "edging," in which the semi-finished product is reworked on the edge for fitting into a desired spectacle frame, giving it the shape of the respective frame. Since the semi-finished product is no longer fixed to the block, its position must be determined again (for example, using the aforementioned markings) before the semi-finished product can be appropriately fixed and finally finished in a so-called "edger," which serves as an edge processing device, with regard to its edge shape and attachment to the spectacle frame.

[0010] Special requirements for the processing and treatment steps described above arise in the case of ophthalmic lenses due to the fact that, for example, an ophthalmologist's prescription for the individual ophthalmic lens may require that the front and back surfaces of the ophthalmic lens be positioned at a specific angle to each other, i.e., tilted relative to each other, in order to compensate for certain misalignments of the eye. For the production of such ophthalmic lenses with a predetermined, so-called "prism," it is customary to block the ophthalmic lens blank "prismatically," i.e., to attach it to the assigned receiving surface on the block piece with its front surface tilted in a defined manner—or laterally offset or rotated in a defined manner with respect to the block piece axis. In the case of tilting, the filling material—possibly together with a wedge-shaped intermediate piece (see, for example, US Pat. No. 6,382,790 B1, Fig. 4 and 8A) - between the spectacle lens blank and the block piece, a wedge.

[0011] The prismatic blocking results in, for example, the geometry of the back surface of the rotating ophthalmic lens blank being machined during generation or the previously generated, then finely machined back surface of the rotating semi-finished product being polished, only exhibiting relatively minor wobbling movements relative to an imaginary plane perpendicular to the workpiece rotation axis. As a result, the requirements for the respective tool feed movement parallel to the workpiece rotation axis are relatively low in terms of stroke and dynamics, enabling surface machining with high machining quality.

[0012] The process chain outlined in the prior art contains two necessary auxiliary processes, "blocking" and "unblocking," which do not themselves increase the value of the manufactured ophthalmic lens. A process chain that does not require these auxiliary processes, and in particular the auxiliary and operating materials used in them, would be desirable. Particularly to increase efficiency and for ecological reasons, it has already been proposed in the prior art to work "blockless" in the production of the optically effective surfaces of ophthalmic lenses, with the ophthalmic lenses being held during processing by means of special holding devices or fixtures.

[0013] Examples of this are vacuum lens holders, as described in the publications DE 39 24 078 C2 ( Fig. 1 bis 3 ), US 2008 / 0299881 A1 ( Fig. 3 bis 5 ) or US 7,500,908 B2 ( Fig. 1 bis 5 ). In all these cases, at least one sealing element, i.e., annular, is provided on a lens receiving surface of the lens holder. It extends around the center axis of the lens receiving surface. This sealing element is capable of maintaining a vacuum, applied through the lens holder or from the outside, between the lens receiving surface and the spectacle lens placed on the sealing element radially within the sealing element, in order to releasably secure the spectacle lens to the lens holder.

[0014] In this context, with regard to the subject of manufacturing spectacle lenses with a predetermined prism, document EP 3 608 055 A1 discloses a method for machining an optical surface of an optical lens, which comprises the following steps: a lens blank providing step in which a lens blank blocked on a lens block piece is provided; a clamping step in which the lens block piece holding the lens blank is clamped in a lens processing device; a tilting step in which the lens blank and the lens block piece are tilted relative to the rotation axis of the lens processing device; a surface position determining step in which the position of the surface to be machined is determined based on the tilt angle of the lens blank and the lens block piece relative to the rotation axis of the lens processing device;a step for configuring the machining tool, in which the working parameters of the lens machining tool are configured to produce the surface to be machined according to the specific surface position in such a way that the desired optical properties of the optical lens are maintained. In other words, it is proposed here, in the context of manufacturing an ophthalmic lens with a predetermined prism, to block the ophthalmic lens blank not prismatically, but without a prism, for example, on a vacuum lens holder (see paragraph

[0037] of this document), and then to address the desired prismatic effect solely during the actual machining step and in the machining device by defined tilting of the workpiece. Such a procedure, however, entails a certain amount of device and control engineering effort, which is undesirable for some applications.

[0015] Finally, document EP 3 116 684 B1 ( Fig. 1 bis 4 ) on the subject of prismatic blocking, a device for blocking a spectacle lens blank, which has a finished surface and a processing surface opposite the finished surface for processing in a processing device. The blocking device proposed here is designed in two parts, comprising a receiving component and a clamping block.

[0016] The receiving component has a convex, flat, or concave receiving surface for blocking the finished surface of the ophthalmic lens blank with the aid of a conventional blocking material (see paragraphs

[0025] and

[0026] ) and a substantially flat counter-surface arranged opposite the receiving surface, wherein the normal of the counter-surface is inclined by 1° to 10° relative to the normal at the center of the receiving surface. The receiving surface is designed such that the ophthalmic lens blank can be placed substantially completely on the receiving surface during blocking, in order to fully support the ophthalmic lens blank during processing.

[0017] The clamping block, on the other hand, has a substantially flat and inclined bearing surface on which the receiving component is rotatably mounted with its counter surface, and is designed for clamping in a machining device. Thus, not only the receiving component itself has an inclined counter surface, but also the bearing component (clamping block) on which the receiving component is mounted. The final inclination of the receiving surface for the ophthalmic lens blank thus depends on both the inclination of the counter surface and the inclination of the bearing surface. As a result, the inclination of the receiving surface can be individually adjusted to the prism to be created for the ophthalmic lens by rotating the counter surface relative to the bearing surface. In the respective relative position, the receiving component and the bearing component can ultimately be connected to one another in a form-fitting and / or force-fitting manner.

[0018] Advantageously, such a device design allows for adjustment of the prism, for example, according to the ophthalmologist's prescription, so that the block material does not have to form a correspondingly thick wedge. Consequently, its mass can be reduced and other block materials can be used (see again paragraphs

[0025] and

[0026] of this publication). However, it would be desirable to simplify the adjustment of a defined prism for use of such a device in RX workshops on an industrial scale and, if possible, in a manufacturing process that does not require conventional block materials. TASK

[0019] In contrast to the prior art described so far, the object of the invention is to provide a device for receiving an optical workpiece, namely a spectacle lens, on a first of two opposite workpiece surfaces for machining or treating the optical workpiece on a second of the workpiece surfaces, particularly for a manufacturing process chain that ideally does not require any conventional blocking aids (block piece, block material), which device generally addresses the problems described above with regard to the prior art and specifically enables simplified adjustment of a clearly defined prismatic tilt of the optical workpiece, particularly for use in an at least partially automated manufacturing environment.The object of the invention further comprises specifying a corresponding method for receiving an optical workpiece, in particular a spectacle lens, with a first of two opposite workpiece surfaces on a receiving device for machining or treating the optical workpiece on a second of the workpiece surfaces, with which a prismatic tilt of the optical workpiece can also be adjusted and maintained in the simplest possible manner. PRESENTATION OF THE INVENTION

[0020] The above objects are achieved by a device for receiving an optical workpiece, in particular a spectacle lens, having the features of patent claim 1 and a method for receiving an optical workpiece, in particular a spectacle lens, having the method steps according to patent claim 14. Advantageous or expedient embodiments and further developments of the invention are the subject of the dependent patent claims.

[0021] According to a first aspect of the invention, a device for receiving an optical workpiece, in particular a spectacle lens, on a first of two opposite workpiece surfaces for machining or treating the optical workpiece on a second of the workpiece surfaces, comprising a lower part with a base having a central base axis, which has an interface for spatially defined attachment to a holder, and a lower wedge section adjoining the base along the base axis and extending transversely to the base axis, and an upper part with a receiving section for the optical workpiece, which has a central receiving axis, and an upper wedge section adjoining the receiving section along the receiving axis and extending transversely to the receiving axis, wherein the lower part and the upper part are arranged with the mutually facing,lower and upper wedge sections are rotatable relative to one another about a common axis of rotation, which is inclined with respect to the base axis and the receiving axis, so that a relative rotation of the upper part and lower part about the axis of rotation causes a relative tilting of the receiving section with respect to the base; a wedge orientation arrangement with an orientation aid on the upper part, via which a rotational angle position of the upper part about the base axis can be determined and / or the upper part can be fixed in a rotational angle position about the base axis, and / or with a stop between the upper part and the lower part, which defines at least one rotational angle end position of the upper part with respect to the lower part about the axis of rotation, in which the receiving section on the upper part is minimally or maximally tilted relative to the base of the lower part.

[0022] The provision of a wedge orientation arrangement according to the invention on a holding device which is designed to be adaptive, i.e. adjustable, for any prismatic holding of a workpiece within certain limits, simplifies the pre-adjustment of the holding device with regard to a prism predetermined for the workpiece to be held, in particular in an (at least partially) automated machining sequence, as is desirable, for example, in an industrial manufacturing process for spectacle lenses. The invention makes use of the fact that in the holding device according to the invention, in which basically two wedges lying on top of or above one another on the upper part and lower part are rotated relative to one another about the common axis of rotation, the relative rotational position of the upper part and lower part is decisive for the prismatic tilting of the holding section on the upper part with respect to the base of the lower part.The spatial position of the lower part of the holding device is clearly defined via the interface provided at the base of the lower part, which in particular also includes the rotational position of the lower part around the base axis.

[0023] The orientation aid on the upper part now allows the rotational angle of the upper part around the base axis to be easily determined and / or fixed, thus indirectly ensuring, i.e., checking or adjusting, the prismatic tilt of the receiving section relative to the base. If a receiving device according to the invention, e.g., with a preselected relative rotational position of the lower part and upper part, is inserted into an associated holder with the interface at the base of the lower part, whereby the lower part is given a clearly defined and known position in space, the orientation aid on the upper part can be used to detect its relative rotational position relative to the lower part, and thus easily infer the tilt of the receiving section relative to the base.This can be used, for example, to compare an actual tilt of the receiving section with respect to the base with a target tilt of the receiving section with respect to the base during the machining process in order to, for example, verify the actual tilt of the receiving section in relation to the base before the workpiece is picked up on the receiving device.

[0024] If the orientation aid is additionally adapted, if necessary, to allow the angular position of the upper part to be fixed around the base axis, any desired or required tilt of the receiving section relative to the base can be easily adjusted or corrected during the subsequent machining process. It is then possible, for example, to rotate the lower part, with the interface of the base accommodated in the associated holder, in a defined manner around the base axis via the holder, while the upper part is held against (co-)rotation around the base axis by the orientation aid of the wedge orientation arrangement. Due to the wedge effect described above, the relative tilt of the receiving section and base then changes in accordance with the relative rotation of the upper part and lower part in a predetermined and known manner.

[0025] If, alternatively or in addition to the orientation aid described above, the wedge orientation arrangement comprises the claimed stop between the upper part and lower part, which defines at least one rotation angle end position of the upper part and lower part with minimum or maximum tilting of the receiving section with respect to the base, it is advantageously possible, for example in a (partially) automated machining sequence, to rotate the lower part and upper part of the receiving device relative to one another about the rotation axis without further control for a stop - be it by rotating only the upper part or only the lower part or by rotating the upper part and lower part in opposite directions - in order to achieve a minimum or maximum tilting of the receiving section with respect to the base. If one part (upper part or lower part) is then secured against rotation, the other part (lower part orThe desired tilt of the receiving section relative to the base can be adjusted from the stop position (upper part). The respective degree of tilt depends on the wedge angle of the wedge sections on the lower and upper parts, as well as the angle of the relative rotation between the lower and upper parts.

[0026] In a preferred embodiment of the receiving device, the orientation aid of the wedge orientation arrangement can comprise a projection that extends substantially radially outward from the upper wedge section of the upper part relative to the rotational axis. Unlike, for example, a mere notch or marking on the outside of the upper part, which would in principle be sufficient for detecting the rotational position of the upper part, such a projection can also advantageously serve as a handle by means of which the upper part can be fixed in its rotational angular position about the base axis, for example, by means of a suitable, rotationally fixed counterbearing. As an alternative to such a "raised" geometry on the upper part, the upper part can also have a recess that extends substantially radially inward relative to the rotational axis. Such a recess can then interact, for example, with a complementarily designed slider to fix the upper part in its rotational angular position about the base axis.There are, of course, other possibilities to temporarily secure the upper part of the mounting device against twisting around the base axis - e.g. by means of a circumferential clamp on the mounting section or on the upper wedge section of the upper part.

[0027] If the wedge orientation arrangement (also) comprises the aforementioned (rotational) stop between the upper part and the lower part, this stop can, in an expedient embodiment, have dedicated stop sections, preferably formed in the interior of the receiving device, namely a first stop section on the lower part, which interacts with a second stop section on the upper part.The arrangement can preferably be such that the first stop section and the second stop section of the stop are each designed in the shape of a 90° ring segment when viewed in a plan view along the axis of rotation and each have two end stop surfaces when viewed in a circumferential direction around the axis of rotation, wherein one of the stop surfaces of the first stop section interacts with one of the stop surfaces of the second stop section to determine the maximum tilting of the receiving section on the upper part relative to the base of the lower part, while another of the stop surfaces of the first stop section interacts with another stop surface of the second stop section to determine the minimum tilting of the receiving section on the upper part relative to the base of the lower part.A rotation stop configured in this way between the upper and lower sections of the receiving device advantageously defines both extreme positions of the receiving section's tilt. The design of the stop sections as ring segments also offers the advantage that, compared to, for example, the equally conceivable four discrete stop points instead of the end stop surfaces on the ring segments, an incorrect assembly of the receiving device in the relative rotational position of the upper and lower sections is eliminated.

[0028] In principle, a set relative angular position of the upper and lower parts of the holding device can be continuously secured in the rotational angle, e.g., by a frictional connection between the upper and lower parts, possibly mediated by a rubber ring or similar between the upper and lower parts, provided a sufficient normal force acts between the upper and lower parts. However, with a view to reliably maintaining the set relative angular position of the upper and lower parts—and thus the desired tilting of the holding section relative to the base—even under torsional moments around the rotational axis acting on the upper or lower parts, e.g., due to the machining or treatment of the workpiece held on the holding device and / or as a result of the rotary drive of the holding device, it is preferred if a set relative angular position of the upper and lower parts can be secured in a form-fitting manner in stages around the rotational axis.

[0029] A preferred option for the stepped, positive locking of the adjusted relative angular position of the upper and lower parts consists in providing a Hirth toothing as a positive connection between the upper and lower parts, with a first toothing section on an upper side of the lower part and a second toothing section complementary to the first toothing section on an underside of the upper part. One advantage of such a Hirth toothing is that the Hirth toothing—for example, when used as a slip clutch in a cordless drill / driver with torque limiting—allows for a targeted "slipping" of the toothing sections when the normal forces between the toothing sections are relatively low. This facilitates the sensitive adjustment of a specific relative angular position of the upper and lower parts.Once the relative angular position of the upper and lower parts required for the desired tilting of the receiving section has been achieved, the resulting positive connection can be secured simply by increasing the normal force. A further advantage of such a Hirth gearing arises from its self-centering properties, which are determined by the conical shape of the individual teeth when viewed in cross-section. These tend to center the upper and lower parts of the receiving device equally with respect to the rotational axis.

[0030] In investigations carried out by the inventors, a Hirth toothing has proven to be advantageous with regard to low installation space requirements and moderate required axial holding forces, which preferably has a number of teeth between 28 and 36 teeth and / or in which the individual teeth have a tooth height of between 1 mm and 3 mm on the radially outer edge of the teeth with respect to the axis of rotation and / or the individual teeth lie within a circle around the axis of rotation which has a radius of between 15 mm and 20 mm with respect to the axis of rotation.

[0031] As far as the actual mounting of the optical workpiece on the mounting section of the upper part is concerned, this can generally be designed such that the workpiece is rigidly and releasably attached to the mounting section of the upper part, for example, using a conventional (block) adhesive. This can have advantages for certain applications due to the relatively firm, full-surface support of the workpiece on the mounting section. In contrast, however, a design of the mounting device is preferred in which a flexible mounting ring is attached to the mounting section of the upper part, onto which the optical workpiece can be placed with its first workpiece surface. This advantageously enables the workpiece to be held on the mounting section of the upper part using the "vacuum" principle, while avoiding the use of conventional block materials. Preliminary investigations by the inventors in this context had shown that, for example, in the case of the production of spectacle lenses, for example,In the polishing process with flexible tools, the requirements regarding positioning accuracy and surface support are significantly lower than in the upstream generation of the optically active mold, which, for example, in the case of plastic ophthalmic lenses, regularly involves force-intensive milling and turning. In such a polishing process, a positioning accuracy in the millimeter range has proven sufficient, and in terms of support, it has proven sufficient to secure the ophthalmic lens against tilting, which the flexible mounting ring can achieve overall.

[0032] In the tests carried out by the inventors, it has also proven particularly advantageous, especially with regard to the best possible adaptability of the flexible holding ring to the surface geometry of the optical workpiece to be held, without the risk of the workpiece being supported in a way that is too "soft", for example for a polishing process, and with regard to good resistance to the liquid auxiliary materials that may be used in the respective manufacturing step, if the flexible holding ring is made of NBR or EPDM and / or has a hardness according to SHORE A between 15 and 80, preferably between 20 and 50 and / or has a material thickness between 1.0 mm and 8.0 mm, preferably between 2.0 mm and 5.0 mm.The aforementioned material thickness can, but does not have to, be uniform across the surface of the retaining ring; rather, it may increase or decrease, particularly in the radial direction within the stressed limits, depending on the respective retaining requirements. "Receiving ring" in this context does not necessarily mean a circular ring, but also includes rings with a different closed ring shape, e.g., with an outer contour that, when viewed from above, has a cushion shape or similar.

[0033] As already indicated above, in a preferred embodiment, for example, for a polishing process for spectacle lenses, the holding device can comprise an outer vacuum chamber on the upper part, which is bounded by at least one end face of the holding section on the upper part and an inner peripheral surface of the flexible holding ring, and which can be evacuated to releasably hold the optical workpiece placed on the flexible holding ring on the first workpiece surface. This advantageously avoids the use of conventional block materials for releasably securing the workpiece to or on the holding section.

[0034] Regarding the detachable coupling or fastening of the lower part and the upper part to one another when they are in their desired or required relative rotational position to one another, various solutions are also conceivable. For example, a detachable connection by spring force or a combined force- and form-locking securing with the aid of screws or the like can be provided. However, particularly with regard to good automation of the production and removal of the connection between the lower part and the upper part, the highest possible efficiency - also in terms of time - and the lowest possible device expenditure, it is preferred if the lower part and the upper part delimit an inner vacuum chamber which is sealed from the environment by a sealing ring and which can be evacuated in order to detachably hold the upper part in a predetermined rotational angular position around the rotation axis on the lower part. The sealing ring can, for example, beIt can be a standard O-ring or a so-called "quad ring", i.e. a round cord ring with an approximately square cross-section.

[0035] In this case, it is particularly preferred if the inner vacuum chamber is pneumatically connectable or connected to the outer vacuum chamber, the latter preferably via a connecting hole in the receiving section of the upper part. This means that one and the same vacuum can advantageously be used to releasably hold the package consisting of the lower part, upper part, and workpiece together in a predetermined relative position. One advantage of the optional connecting hole is that a permanent connection between the inner and outer vacuum chambers facilitates the release of the workpiece from the receiving device after machining / treatment of the workpiece, because the vacuum is thus present at two separation points from the environment, namely on the inside at the sealing ring and on the outside at the receiving ring, and the presence of these two separation points increases the probability that at least one of them will be released.

[0036] In a further development of the holding device, a spring element can be arranged between the lower part and the upper part to generate a preload force between the lower part and the upper part, which forces the lower part and the upper part apart. Such a spring element can advantageously assist in the separation of the lower and upper parts from each other, and when negative pressure is used to hold the lower and upper parts together, it can particularly serve to release the vacuum in a time-efficient manner.

[0037] With a view to achieving the highest possible process reliability when using the holding device in an (at least partially) automated production environment, it is further preferred if a locking connection is formed between the lower part and the upper part of the holding device, which locking connection secures the upper part with play against loss on the lower part, preferably comprising a plurality of flexible locking hooks on one part, which interact with an undercut on the other part.

[0038] Finally, in a preferred embodiment of the receiving device, a centering aid can be formed between the lower part and the upper part, which aligns the upper part and the lower part with respect to the common axis of rotation, preferably comprising a substantially hollow-cylindrical sleeve section on one part, which cooperates with a substantially cylindrical collar on the other part. Such a centering aid advantageously simplifies the assembly of the receiving device.

[0039] According to a second aspect of the invention, a method for receiving an optical workpiece, in particular a spectacle lens, with a first of two opposite workpiece surfaces on a receiving device for machining or treating the optical workpiece on a second of the workpiece surfaces comprises the following steps: a) Providing the optical workpiece to be machined or treated; b) Providing the receiving device for the optical workpiece, comprising a lower part with a base having a central base axis, which has an interface for spatially defined attachment to a holder, and a lower wedge section adjoining the base along the base axis and extending transversely to the base axis, as well as an upper part with a receiving section for the optical workpiece having a central receiving axis and a receiving section adjoining the receiving section along the receiving axis,upper wedge section extending transversely to the receiving axis, wherein the lower part and the upper part, with the mutually facing lower and upper wedge sections, are rotatable relative to one another about a common axis of rotation, which is inclined with respect to the base axis and the receiving axis, so that a relative rotation of the upper part and lower part about the axis of rotation causes a relative tilting of the receiving section with respect to the base, wherein the receiving device additionally has a flexible receiving ring on the receiving section, an outer vacuum chamber delimited at least by an end face of the receiving section and an inner circumferential surface of the flexible receiving ring, and an inner vacuum chamber sealed from the environment by a sealing ring between the lower part and the upper part; c) ensuring,that the desired relative tilt of the receiving section on the upper part with respect to the base of the lower part is present; d) placing the optical workpiece with its first workpiece surface on the flexible receiving ring on the receiving section of the upper part of the receiving device, aligned with the receiving axis of the receiving device; and e) jointly evacuating the inner vacuum chamber and the outer vacuum chamber in order to simultaneously secure the upper and lower parts of the receiving device in their relative rotational position about the rotational axis to one another and to secure the optical workpiece to the receiving section of the receiving device.

[0040] In a particularly time-efficient manner, one and the same vacuum can therefore advantageously be used in this procedure not only to temporarily, i.e. releasably, fix the workpiece to the holding device, but at the same time also to releasably secure the relative rotational position of the lower part and upper part of the holding device to one another and the tilting position of the holding section on the upper part with respect to the base of the lower part.

[0041] In a preferred embodiment of this method, at least step e) can be carried out in an evacuable container into which the holding device and the optical workpiece are inserted. This means that there is no requirement for the inner vacuum chamber and the outer vacuum chamber to have any pneumatic connection within the holding device. This has the advantage that, if the workpiece is lost during a polishing process, for example, no abrasive polishing agent can penetrate into the interior of the holding device and contaminate any mechanics present there (for example, the aforementioned Hirth gearing). Viewed in the opposite direction, there is also no risk of abrasion resulting from the mechanics of the holding device from the inner vacuum chamber entering the outer vacuum chamber and possibly damaging the held surface of the workpiece.This also makes it advantageous to clean the holding device without the workpiece being held on it, since the inner vacuum chamber is closed to the outside even without the workpiece.

[0042] If step e) is performed in an evacuable container, a step f) of removing the holding device and the optical workpiece held therein from the evacuable container can follow. This step involves venting the evacuable container at the beginning of this step, while the optical workpiece is pressed against the flexible holding ring, essentially along the holding axis. This, in turn, promotes high process reliability because it ensures that the inner and outer vacuum chambers are not inadvertently vented when the evacuable container is vented.

[0043] Furthermore, step c) of ensuring the desired relative tilt of the receiving section with respect to the base can comprise a relative rotation of the upper and lower parts of the receiving device about the axis of rotation. However, if the receiving device, when provided in step b), already comes with a relative rotational position of the lower part and upper part that effects the desired or required tilt of the receiving section of the upper part with respect to the base of the lower part, a relative rotation of the upper and lower parts in step c) is obsolete. Then, step c) merely comprises checking whether the actual tilt of the receiving section corresponds to the desired tilt of the receiving section. Such a check can, of course, also be carried out indirectly by comparing a relative actual rotation of the upper and lower parts with a relative desired rotation of the upper and lower parts.

[0044] Finally, step d) of placing the optical workpiece aligned with the receiving axis of the receiving device can comprise centering the optical workpiece with respect to the receiving axis of the receiving device and / or orienting the optical workpiece's rotational angle around the receiving axis of the receiving device. In any case, in step d), it must be ensured that the optical workpiece is positioned in a relative position on the receiving section of the receiving device that results in the desired or required prismatic tilt of the workpiece—usually a relative position in which the prism set on the receiving device substantially compensates for the prism of the workpiece.In this case, a division of movement between the workpiece and the holding device can also take place, for example in such a way that the holding device itself is only rotated about the base axis, while the workpiece, knowing its rotational position, is positioned in the remaining three translational and two rotational degrees of freedom of movement with respect to the holding device.

[0045] Further features, properties and advantages of the device according to the invention and the method according to the invention for receiving or for receiving an optical workpiece will become apparent to the person skilled in the art from the following description of a preferred embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The invention will be explained in more detail below using a preferred embodiment with reference to the accompanying, partially schematic drawings. The drawings show: Fig. 1 shows a side view of a receiving device according to the invention, in which a semi-finished spectacle lens with a prism is received, and which has a lower part with a lower wedge section and an upper part with an upper wedge section, which are rotatable relative to one another about a common axis of rotation, which causes a relative tilting of a receiving section of the upper part, which has a receiving axis, with respect to a base of the lower part, which has a base axis, wherein the viewing direction is selected such that the view falls frontally onto a projection of an orientation aid on the upper part, which indicates the rotational angle position of the upper part about the base axis and is part of a wedge orientation arrangement; Fig. 2 shows a side view of the receiving device with the semi-finished spectacle lens received thereon according to Fig. 1 , looking from the right into Fig. 1 ; Fig. 3 a side view of the receiving device with the spectacle lens semi-finished product held thereon according to Fig. 1 , looking from the left in Fig. 1 ; Fig. 4 a bottom view of the holding device with the spectacle lens semi-finished product held thereon according to Fig. 1 , with a view of an interface at the base of the lower part, which serves for the spatially defined attachment of the receiving device to a holder; Fig. 5 a perspective exploded view of the receiving device and the spectacle lens semi-finished product according to Fig. 1 , which, viewed from bottom to top, shows the lower part, a sealing ring between the lower part and the upper part, the upper part, a flexible receiving ring between the upper part and the spectacle lens semi-finished product, as well as the spectacle lens semi-finished product, wherein, viewed from bottom to top, the base axis, the rotation axis and the receiving axis of the receiving device are also shown, and the viewing angle of the perspective is selected such that the angular positioning of the axes mentioned relative to one another or their lack of axial alignment is recognizable; Fig. 6 a perspective view of the lower part of the receiving device according to Fig. 1 from obliquely above / left, wherein the angle of the perspective is selected so that in particular a first stop section of a stop between the upper part and the lower part can be seen, which as a further component of the wedge orientation arrangement around the axis of rotation defines rotation angle end positions of the upper part with respect to the lower part, in which the receiving section is minimally or maximally tilted relative to the base; Fig. 7 a perspective view of the upper part of the receiving device according to Fig. 1 from diagonally below / left, wherein the angle of the perspective is selected so that in particular a left end stop surface of a second stop section of the stop between the upper part and the lower part can be seen; Fig. 8 a perspective view of the upper part of the receiving device according to Fig. 1 from diagonally below / right, wherein the angle of the perspective is selected so that in particular a right end stop surface of the second stop section of the stop between the upper part and the lower part can be seen; Fig. 9 a perspective view of the upper part of the receiving device according to Fig. 1 from obliquely above / left, looking into an outer vacuum chamber, which is delimited by an end face of the receiving section and an inner circumferential surface of the flexible receiving ring and which can be evacuated for releasably holding a spectacle lens semi-finished product (not shown here) placed on the flexible receiving ring; Fig. 10 a side view of the receiving device according to Fig. 1 , which is inserted in an evacuable container of a joining unit indicated by dashed lines, with the Fig. 10 On the left side of the receiving device, a fixed stop of the joining unit is shown, which interacts with the projection of the orientation aid on the upper part, and wherein the lower part and upper part of the receiving device are in any relative rotational position to each other around the axis of rotation, which here differs from a rotational angle end position of the upper part with respect to the lower part; Fig. 11 a side view of the receiving device according to Fig. 1 in the relative rotational position of the upper and lower parts according to the Fig. 10 , looking from the left in Fig. 10 and the announcement of Fig. 10 ; Fig. 12 a bottom view of the receiving device according to Fig. 1 in the relative rotational position of the upper and lower parts according to the Fig. 10 , looking from below into Fig. 11 and the announcement of Fig. 10 ; Fig. 13 a sectional view of the receiving device rotated clockwise in the plane of the drawing according to Fig. 1 and the announcement of Fig. 10 according to the section line XIII-XIII in Fig. 10 , to illustrate that in the shown relative rotational position of the upper part and lower part, the first stop section on the lower part and the second stop section on the upper part are spaced apart from each other in the circumferential direction around the axis of rotation; Fig. 14 a sectional view of the receiving device according to Fig. 1 according to the section line XIV-XIV in Fig. 11 ; Fig. 15 a side view of the receiving device according to Fig. 1 and the announcement of Fig. 10 , whereby the lower part and upper part are in the relative rotational position according to the Fig. 10 bis 14 are compared to the Fig. 10 bis 14 However, the receiving device as a whole has been rotated around the base axis until the projection of the orientation aid provided on the upper part has come into contact with the fixed stop; Fig. 16 a side view of the receiving device according to Fig. 1 in the relative rotational position of the upper and lower parts according to the Fig. 10 bis 14 , looking from the left in Fig. 15 and the announcement of Fig. 10 ; Fig. 17 a bottom view of the receiving device according to Fig. 1 in the relative rotational position of the upper and lower parts according to the Fig. 10 bis 14 , looking from below into Fig. 16 and the announcement of Fig. 10 , where a rotation arrow illustrates the rotation of the receiving device as a whole around the base axis; Fig. 18 a sectional view of the receiving device rotated clockwise in the plane of the drawing according to Fig. 1 and the announcement of Fig. 10 according to the section line XVIII-XVIII in Fig. 16 , which in Fig. 16 however, indicates a cutting plane perpendicular to the axis of rotation, i.e. a cutting plane that is actually with respect to a surface normal on the drawing plane of the Fig. 16 is slightly tilted, again with the rotation arrow from the Fig. 17 ; Fig. 19 a sectional view of the receiving device rotated counterclockwise in the drawing plane according to Fig. 1 according to the section line XIX-XIX in Fig. 17 ; Fig. 20 a side view of the receiving device according to Fig. 1 and the announcement of Fig. 10 , whereby the upper part is in the rotational position held by the fixed stop and projection according to the Fig. 15 bis 19 is located, compared to the Fig. 15 bis 19 the lower part, however, has been rotated around the base axis until the first stop section of the lower part has come into contact with the second stop section of the upper part, i.e. a rotation angle end position of the lower part with respect to the upper part has been reached, in which the receiving section is minimally tilted relative to the base, ie not tilted; Fig. 21 a side view of the receiving device according to Fig. 1 in the relative rotational position of the upper and lower parts according to the Fig. 20 , looking from the left in Fig. 20 and the announcement of Fig. 10 ; Fig. 22 a bottom view of the receiving device according to Fig. 1 in the relative rotational position of the upper and lower parts according to the Fig. 20 , looking from below into Fig. 21 and the announcement of Fig. 10 , where a rotation arrow illustrates the rotation of the lower part relative to the upper part around the base axis; Fig. 23 a sectional view of the receiving device rotated clockwise in the plane of the drawing according to Fig. 1 and the announcement of Fig. 10 according to the section line XXIII-XXIII in Fig. 20 , again with the rotation arrow from the Fig. 22 on the lower part; Fig. 24 a sectional view of the receiving device according to Fig. 1 according to the section line XXIVXXIV in Fig. 21 , in which dashed auxiliary lines indicate how the relative rotational position of the upper and lower parts can be adjusted according to the Fig. 20 bis 23 the wedge angles of the lower wedge section and the upper wedge section "cancel each other out" so that the receiving section is not tilted relative to the base; Fig. 25 a side view of the receiving device according to Fig. 1 and the announcement of Fig. 10 , where compared to the Fig. 20 bis 24 the lower part has been rotated back around the base axis with respect to the upper part held by the projection on the fixed stop, until a predetermined tilt of the receiving section with respect to the base of, for example, 7° is reached; Fig. 26 a side view of the receiving device according to Fig. 1 in the relative rotational position of the upper and lower parts according to the Fig. 25 , looking from the left in Fig. 25 , the festival poster of Fig. 10 and a locking member, indicated by a rectangle, which can be retracted perpendicular to the plane of the drawing and which, in cooperation with the fixed stop, is able to hold the upper part against rotation on the projection of the orientation aid; Fig. 27 a bottom view of the receiving device according to Fig. 1 in the relative rotational position of the upper and lower parts according to the Fig. 25 , looking from below into Fig. 26 , the festival poster of Fig. 10 and the locking link Fig. 26 , where a rotation arrow illustrates the (reverse) rotation of the lower part relative to the upper part around the base axis, while a double arrow illustrates the movement possibility of the locking member; Fig. 28 a sectional view of the receiving device rotated clockwise in the plane of the drawing according to Fig. 1 , the announcement of Fig. 10 and the locking link Fig. 26 according to the section line XXVIII-XXVIII in Fig. 26 , again with the rotation arrow and the double arrow from the Fig. 27 ; Fig. 29 a sectional view of the receiving device according to Fig. 1 according to the section line XXIXXXIX in Fig. 25 ; Fig. 30 a sectional view of the receiving device with the spectacle lens semi-finished product received thereon according to Fig. 1 according to the cutting line XXX-XXX in Fig. 2 , whereby the relative rotational position of the upper and lower parts corresponds to that of the Fig. 25 bis 29 and wherein an optional spring element is indicated by a dashed line at a central point between the lower part and the upper part, which generates a pre-tensioning force that pulls the lower part and the upper part apart; Fig. 31 a sectional view of the holding device rotated clockwise in the plane of the drawing with the semi-finished spectacle lens according to Fig. 1 according to the section line XXXI-XXXI in Fig. 1 , ie in the relative rotational position of upper and lower parts as in Fig. 30 ; Fig. 32 a side view of the receiving device according to Fig. 1 and the announcement of Fig. 10 , whereby the upper part is in the rotational position relative to the fixed stop according to the Fig. 15 bis 29 is located, compared to the Fig. 20 bis 24 the lower part, however, has been rotated in the opposite direction around the base axis until the first stop section of the lower part has come into contact with its other end stop surface on the other end stop surface of the second stop section of the upper part, thus reaching a rotation angle end position of the lower part with respect to the upper part, in which the receiving section is maximally tilted relative to the base; Fig. 33 a side view of the receiving device according to Fig. 1 in the relative rotational position of the upper and lower parts according to the Fig. 32 , looking from the left in Fig. 32 , the festival poster of Fig. 10 and again the locking link Fig. 26 , which, in conjunction with the fixed stop, holds the upper part against twisting on the projection of the orientation aid; Fig. 34 a bottom view of the holding device according to Fig. 1 in the relative rotational position of the upper and lower parts according to the Fig. 32 , looking from below into Fig. 33 , the festival poster of Fig. 10 and the locking link Fig. 26 , where again a rotation arrow illustrates the (re)rotation of the lower part relative to the upper part around the base axis, while a double arrow illustrates the movement possibility of the locking member; Fig. 35 a sectional view of the receiving device rotated clockwise in the plane of the drawing according to Fig. 1 , the announcement of Fig. 10 and the locking link Fig. 26 according to the section line XXXV-XXXV in Fig. 32 , again with the rotation arrow and the double arrow from the Fig. 34 , wherein a recess in the upper part is shown in a dot-dash box as an alternative to the projection of the orientation aid, into which a slider can be inserted as an alternative to the fixed stop and locking member in order to secure the upper part in the rotational position shown; and Fig. 36 a sectional view of the receiving device according to Fig. 1 and the locking link Fig. 26 according to the section line XXXVI-XXXVI in Fig. 33 , in which dashed auxiliary lines indicate how the relative rotational position of the upper and lower parts according to the Fig. 32 the wedge angles of the lower wedge section and the upper wedge section "add up" so that the receiving section is maximally tilted with respect to the base, whereby analogously to the Fig. 35 the alternative anti-rotation device of the upper part with recess and slider is shown in a dotted box.

[0047] In general, it should be noted at this point that the drawings Fig. 6 bis 8 , 13 , 18 , 23 , 28 , 31 and 35 A central marking "B" is shown on the lower and upper parts of the holding device, which in the specific embodiment indicates the type of holding device according to size. To cover the desired range of diameters and curvatures of the spectacle lenses, it may be necessary to use several versions of the holding device. However, this marking is irrelevant to the function of the holding device. This marking is nevertheless shown here to provide quicker orientation regarding the respective rotational position of the lower and upper parts. DETAILED DESCRIPTION OF THE EMBODIMENT

[0048] In the Fig. 1 bis 5 and 10 bis 36 A device for receiving an optical workpiece - also referred to as receiving device in the present application - is generally designated by the reference numeral 10. As an example of an optical workpiece to be received or received on the receiving device 10, Fig. 1 bis 5 , 30 und 31 a semi-finished spectacle lens product – hereinafter referred to as "spectacle lens" 12 – is shown. The spectacle lens 12 has two – at least at the end of processing – optically effective workpiece surfaces 14, 16 and a workpiece edge 18 between them. The holding device 10 generally serves to hold the spectacle lens 12 on a first (workpiece surface 14) of the two opposite workpiece surfaces 14, 16 for processing or treatment of the spectacle lens 12 on a second (workpiece surface 16) of the workpiece surfaces 14, 16. The processing can, for example, involve a conventional polishing of the workpiece surface 16 of the spectacle lens 12, and the treatment can, for example, involve a conventional marking of the workpiece surface 16 of the spectacle lens 12, as already described above.

[0049] A special feature of the spectacle lens 12 shown here is that, as the Fig. 1 bis 3 , 5 and 30show, the spectacle lens 12 has a prism, i.e., the two workpiece surfaces 14, 16 are positioned at a specific angle to one another, i.e., tilted relative to one another, so that the spectacle lens 12 has a wedge shape, so to speak. To ensure, with such a workpiece shape, that the spectacle lens 12, rotated about a rotational axis during or for machining or treatment, with its workpiece surface 16 to be machined or treated, does not wobble excessively with respect to a plane transverse to the rotational axis, the holding device 10 is designed to be "adaptive," i.e., it can be adapted to the prism of the spectacle lens 12 or compensate for it, as will be explained in more detail below.

[0050] As in the Fig. 5 bis 9 As can be clearly seen, the receiving device 10 generally comprises a lower part 20 and an upper part 22. The Fig. 5 and 6The lower part 20 of the holding device 10, shown separately, initially has a base 24 with a central base axis BA. The base 24 has a known interface 26 for spatially defined attachment to a holder (not shown) of a machine or device for processing or treating the spectacle lens 12. Furthermore, the lower part 20 comprises a lower wedge section 28 adjoining the base 24 along the base axis BA and extending transversely to the base axis BA.

[0051] The Fig. 5 and 7 bis 9 The upper part 22 of the receiving device 10, which is shown separately, has a receiving section 30 for the spectacle lens 12, which has a central receiving axis AA. Furthermore, the upper part 22 has an upper wedge section 32 adjoining the receiving section 30 along the receiving axis AA, which extends transversely to the receiving axis AA.

[0052] The lower wedge section 28 of the lower part 20 and the upper wedge section 32 of the upper part 22 have a common rotation axis DA, which is inclined with respect to both the base axis BA and the receiving axis AA, as shown in Fig. 5 is indicated by angle arrows. As will be described in more detail below, the lower part 20 and the upper part 22, in the assembled state of the receiving device 10 with the mutually facing lower and upper wedge sections 28, 32, can be rotated relative to one another about the common axis of rotation DA, wherein the relative rotation of the lower part 20 and the upper part 22 about the axis of rotation DA causes a relative tilting of the receiving section 30 of the upper part 22 with respect to the base 24 of the lower part 20.

[0053] As will also be explained in more detail below, various measures i), ii), and iii) are implemented on the holding device 10, which improve, in particular simplify, and accelerate the setting and maintenance of a defined prismatic tilt of the spectacle lens 12 on the holding device 10 in an at least partially automated production environment. Although these measures i) to iii) are implemented jointly in the illustrated embodiment for the holding device 10, they do not necessarily have to be implemented; thus, they can also be used individually.

[0054] Thus, the receiving device 10 is initially provided with a wedge orientation arrangement, which in the illustrated embodiment (among other things) has both i) an orientation aid 34 on the upper part 22, as for example in the Fig. 7 bis 9can be clearly seen, and ii) comprises a stop 36 between the upper part 22 and the lower part 20 (see in particular the sectional views according to the Fig. 13 , 18 , 23 , 28 , 31 and 35 ). While i) the orientation aid 34 on the upper part 22 can be used to determine a rotational angle position of the upper part 22 about the base axis BA and / or to fix the upper part 22 in a rotational angle position about the base axis BA, ii) the stop 36 provided between the upper part 22 and the lower part 20 defines at least one (in the illustrated embodiment two) rotational angle end position(s) of the upper part 22 with respect to the lower part 20 about the rotational axis DA, in which the receiving section 30 on the upper part 22 is minimally (cf. the Fig. 20 to 24 ) or maximum (see the Fig. 32 to 36 ) is tilted.

[0055] In addition, iii) an outer vacuum chamber 38 is provided on the upper part 22 of the receiving device 10 (cf. e.g. Fig. 9 ), which can be evacuated to releasably hold the spectacle lens 12 on the first workpiece surface 14, while between the lower part 20 and the upper part 22 of the holding device 10 there is also an inner vacuum chamber 40 (see, for example, the Fig. 14 , 19 , 24 , 29 , 30 and 36) which can be evacuated in order to releasably hold the upper part 22 in a predetermined rotational angular position about the rotation axis DA on the lower part 20. A further special feature here is that a joint evacuation of the inner vacuum chamber 40 and the outer vacuum chamber 38 is possible in order to simultaneously secure the upper part 22 and lower part 20 of the holding device 10 in their relative rotational position about the rotation axis DA to one another and to secure the spectacle lens 12 on the holding section 30 of the holding device 10, as will be explained in more detail below.

[0056] According in particular to the Fig. 1 to 5The interface 26 on the base 24 of the lower part 20 comprises, in a manner known per se, various surfaces, by means of which the holding device 10 can be held in a spatially clearly defined, form-fitting and rotationally capable manner on a holder, e.g. a collet chuck of a workpiece spindle (not shown). In detail, this is only shown in the figures for the sake of simplicity. Fig. 1 to 5 with reference numeral - around a height reference surface 42 running transversely to the base axis BA, a centering surface 44 on the outer circumference of the base 24, a continuous rotary driving recess 46 which also runs transversely to the base axis BA and is V-shaped in cross section, and a recess 48 which is formed at an angle offset in the circumferential direction around the base axis BA for the rotational angle orientation of the lower part 20.

[0057] On the outside of the upper part 22 of the receiving device 10, in particular from the Fig. 1 to 5 and 7 to 9It is immediately apparent that the orientation aid 34 has a projection 50 which extends from the upper wedge section 32 of the upper part 22 essentially radially outward with respect to the rotational axis DA. In an alternative embodiment, the orientation aid 34 on the upper part 22 can also have a recess 51 which extends essentially radially inward with respect to the rotational axis DA, as shown in the dot-dash boxes of the Figs. 35 and 36 is shown.

[0058] The wedge orientation arrangement further comprises externally visible marking slots 52, 53 in the lower wedge section 28 of the lower part 20 and the upper wedge section 32 of the upper part 22, which indicate the relative rotational position of the lower part 20 and the upper part 22. If these marking slots 52, 53 are aligned with each other, as shown in the Fig. 22 to 24As shown, the receiving section 30 of the upper part 22 is minimal with respect to the base 24 of the lower part 20, ie, it is not tilted in the illustrated embodiment. However, if the marking slots 52, 53 are located on diametrically opposite sides of the receiving device 10 with respect to the rotation axis DA, as in the Fig. 34 to 36 As shown, the receiving section 30 is tilted to the maximum with respect to the base 24.

[0059] In the transition area between the lower part 20 and the upper part 22, it can also be seen from the outside that a centering aid 54 is formed between the lower part 20 and the upper part 22, which aligns the upper part 22 and the lower part 20 with respect to the common axis of rotation DA. In the illustrated embodiment, the centering aid 54 comprises a substantially hollow-cylindrical sleeve section 55 on the upper part 22, which cooperates with a substantially cylindrical collar 56 on the lower part 20, as best shown in the sectional views according to the Fig. 14 , 19 , 24 , 29 , 30 and 36 can be seen.

[0060] The receiving section 30 of the upper part 22 has a concavely shaped end face 58 facing away from the lower part 20. In the area of ​​the end face 58 or surrounding it, a flexible receiving ring 60 is attached to the receiving section 30 of the upper part 22, onto which the spectacle lens 12 can be placed with its first workpiece surface 14. As already mentioned above, the flexible receiving ring 60 can be made of NBR ( Nitrile Butadiene Rubber ) or EPDM ( Ethylene-propylene-diene; M group ) and preferably have a SHORE A hardness between 15 and 80, more preferably between 20 and 50. As an alternative, a foam ring made of, for example, PUR ( Polyurethane elastomer) is conceivable, which is provided with a coating of natural rubber and has a similar hardness range. A suitable, possibly uniform material thickness for such a flexible receiving ring 60 is preferably between 1.0 mm and 8.0 mm, more preferably between 2.0 mm and 5.0 mm. The concave shape of the end face 58 with its relatively strong curvature as well as the flexible, adaptable receiving ring 60 make it possible to hold spectacle lenses 12 with a wide variety of front curves to their respective workpiece surface 14.

[0061] As far as the operating principle of holding is concerned, the upper part 22 of the receiving device 10 is provided in accordance in particular with the Fig. 9 , 14 , 19 , 24 , 29 , 30 and 36The outer vacuum chamber 38 is provided, which is delimited (among other things) by the end face 58 of the receiving section 30 on the upper part 22 and an inner peripheral surface 62 of the flexible receiving ring 60. The outer vacuum chamber 38 can also be tightly closed by the workpiece surface 14 of the spectacle lens 12 on the side of the flexible receiving ring 60 facing away from the base 24 and can be evacuated to releasably hold the spectacle lens 12 placed on the flexible receiving ring 60, as will be described below.

[0062] The interior of the receiving device 10 is best seen in the perspectives according to the Fig. 6 to 8 and the sectional views according to the Fig. 14 , 19 , 24 , 29 , 30 and 36Accordingly, the inner vacuum chamber 40, which is delimited by the lower part 20 and the upper part 22 and which can be vented in order to detachably hold the upper part 22 in a predetermined rotational angle position about the rotation axis DA on the lower part 20, is sealed from the environment by a sealing ring 64. The sealing ring 64 can be, for example, an O-ring, as shown in the figures mentioned. In a variant, the inner vacuum chamber 40 can be pneumatically connected to the outer vacuum chamber 38 via a connecting hole 66 in the receiving section 30 of the upper part 22, as shown by dashed lines in the Fig. 7 to 9 , 29 and 30 indicated, so that the inner vacuum chamber 40 can also be vented via the outer vacuum chamber 38, or vice versa.

[0063] Furthermore, the stop 36 of the wedge orientation arrangement, which has already been briefly described above, is formed inside the receiving device 10. According to the Fig. 6 to 8The stop 36 has a first stop section 68 on the lower part 20, which interacts with a second stop section 69 of the stop 36 on the upper part 22. The first stop section 68 and the second stop section 69 of the stop 36 are each designed in the shape of a 90° ring segment in a plan view along the rotation axis DA and each have two end stop surfaces 70, 71, 72, 73 as seen in a circumferential direction around the rotation axis DA. One (stop surface 70) of the stop surfaces 70, 71 of the first stop section 68 interacts with one (stop surface 72) of the stop surfaces 72, 73 of the second stop section 69 to determine the maximum tilting of the receiving section 30 on the upper part 22 relative to the base 24 of the lower part 20 (see the Fig. 35). Another (stop surface 71) of the stop surfaces 70, 71 of the first stop section 68, however, interacts with another (stop surface 73) of the stop surfaces 72, 73 of the second stop section 69 to determine the minimum tilting of the receiving section 30 on the upper part 22 relative to the base 24 of the lower part 20 (cf. the Fig. 23 ).

[0064] A further special feature of the mounting device 10 is that a relative rotational angular position of the lower part 20 and the upper part 22 around the rotation axis DA can be positively secured in stages. For this purpose, a Hirth toothing 74 is formed inside the mounting device 10 between the lower part 20 and the upper part 22. The Hirth toothing 74 comprises a first toothing section 75 on an upper side of the lower part 20 and a second toothing section 76, complementary to the first toothing section 75, on an underside of the upper part 22. In the assembled state of the receiving device 10, the two toothing sections 75, 76 engage with each other in a form-fitting and self-centering manner in a manner known per se for a Hirth toothing 74 when the inner vacuum chamber 40 is evacuated and the sealing ring 64 between the lower part 20 and the upper part 22 is compressed with the upper part 22 and the lower part 20 approaching axially.As a result, an unwanted relative rotation of the lower part 20 and the upper part 22 is prevented by positive locking.

[0065] For a specific application, investigations by the inventors have shown that the Hirth toothing 74 should have a number of teeth between 28 and 36. The individual teeth of the Hirth toothing 74 on the radially outer edge of the teeth with respect to the rotation axis DA should also have a tooth height of between 1 mm and 3 mm. Furthermore, the individual teeth of the Hirth toothing 74 should lie within a circle around the rotation axis DA, which circle has a radius of between 15 mm and 20 mm with respect to the rotation axis DA. This results in a relatively steep radial progression of the individual teeth of the Hirth toothing 74 with respect to an imaginary plane transverse to the rotation axis DA. In other words, viewed in a projection onto a plane containing the central axis (= rotation axis DA) of the Hirth toothing 74, the tooth root and tooth tip of a tooth of the Hirth toothing 74 enclose an angle of inclination that is relatively large for a Hirth toothing.

[0066] In order to secure the upper part 22 of the receiving device 10 with play against loss or accidental separation from the lower part 20, a locking connection 78 is also formed - again inside the receiving device 10 - between the lower part 20 and the upper part 22. As best seen in the perspectives according to the Fig. 6 to 8 As can be seen, the locking connection 78 comprises a plurality of flexible locking hooks 79 on one part, here the lower part 20, which interact in an axially locking manner with an associated, annular undercut 80 on the other part, here the upper part 22.

[0067] Structurally, it should be noted with regard to the receiving device 10 that, as in Fig. 30at the reference numeral 82 indicated by a dashed line, a spring element can also be arranged between the lower part 20 and the upper part 22 in order to generate a pretensioning force between the lower part 20 and the upper part 22, which pretensions the lower part 20 and the upper part 22 apart, which supports a release of these parts from one another when the inner vacuum chamber 40 is to be / is ventilated.

[0068] Finally, as regards the wedge formation of the wedge sections 28, 32 on the lower part 20 and upper part 22, the Fig. 24 and 36 the possible range of tilting of the receiving section 30 on the upper part 22 with respect to the base 24 of the lower part 20 in this embodiment. In the illustrated embodiment, the wedge sections 28, 32 each have a wedge angle KW of 5°. In the one rotation angle end position of the lower part 20 with respect to the upper part 22, which is limited by the stop surfaces 71, 73 of the stop 36 (cf. Fig. 23 ) these wedge angles KW cancel each other out, so that the receiving section 30 is not tilted relative to the base 24 (see the Fig. 24 ). A spectacle lens 12 without a prism can be accommodated on a receiving device 10 adjusted in this way.

[0069] The Fig. 36 However, it illustrates the case in which the lower part 20 and the upper part 22 of the receiving device 10 are rotated relative to each other in the opposite direction of rotation. In this other rotation angle end position of the lower part 20 relative to the upper part 22, limited by the stop surfaces 70, 72 of the stop 36 (cf. Fig. 35 ) the mentioned wedge angles KW add up so that the receiving section 30 is tilted maximally with respect to the base 24, namely by 10° (see the Fig. 36 ). A spectacle lens 12 with a prism of, for example, 10° can then be mounted on a mounting device 10 adjusted in this way.

[0070] Depending on the pitch of the Hirth toothing 74, other tilts of the receiving section 30 on the upper part 22 with respect to the base 24 of the lower part 20 can be adjusted in stages, wherein the deformability of the flexible receiving ring 60 allows a spectacle lens 12 with a prism between 0° and approximately 10° to be received on the suitably adjusted receiving device 10 in such a way that its workpiece surface 16 to be machined / treated ultimately has essentially no tilt with respect to the base 24 of the receiving device 10.

[0071] Finally, the method for receiving the spectacle lens 12 with its first workpiece surface 14 on the receiving device 10 for processing or treating the spectacle lens 12 on its second workpiece surface 16 will be briefly described with reference to the various process stages according to 1) the Fig. 10 to 14 (initial arbitrary tilt of e.g. 3°), 2) the Fig. 15 to 19(tilt of 3° before readjustment), 3) the Fig. 20 to 24 (resetting the tilt to 0°), 4) the Fig. 25 to 29 (Resetting the tilt to e.g. 7°), 5) the Fig. 1 to 4 , 30 and 31 (Photograph of the spectacle lens 12 at a tilt of, for example, 7°) or 6) the Fig. 32 to 36 (Illustration of the maximum tilt of 10°).

[0072] In general, the method comprises the following steps: a) Providing the ophthalmic lens 12 to be machined or treated, which has / should have a predetermined prism; b) Providing the above-described, "adaptively" designed receiving device 10 for the ophthalmic lens 12; c) Ensuring that the desired relative tilt of the receiving section 30 on the upper part 22 of the receiving device 10 with respect to the base 24 of the lower part 20 is present; d) Placing the ophthalmic lens 12 with its first workpiece surface 14 on the flexible receiving ring 60 on the receiving section 30 of the upper part 22 of the receiving device 10, aligned with the receiving axis AA of the receiving device 10;and e) jointly evacuating the inner vacuum chamber 40 and the outer vacuum chamber 38 in order to simultaneously secure the upper part 22 and the lower part 20 of the receiving device 10 in their relative rotational position about the rotation axis DA and to simultaneously secure the spectacle lens 12 to the receiving section 30 of the receiving device 10.;

[0073] The steps a) and b) of "providing" the workpiece (spectacle lens 12) and the workpiece holder (holding device 10) in a (partially) automated process sequence, of course, require the presence of appropriate handling devices for positioning the workpiece and the workpiece holder in space, which, however, will not be explained in detail here, as they are sufficiently known to the person skilled in the art. In particular, the provision of the holding device 10 in a (partially) automated process sequence comprises loading the holding device 10 into a Fig. 10Joining unit FE shown as an example and only schematically with dashed lines.

[0074] In this example, the joining unit FE comprises a container BH, which can be tightly closed with a lid DE and evacuated via a vacuum connection VA. A holder HA is arranged in the container BH for receiving the base 24 of the holding device 10 at its interface 26. The holder HA is defined, ie, can be rotated in a controlled manner in the angle of rotation, as indicated by the rotation arrow in Fig. 10indicated. Furthermore, this holder HA, in the manner of a conventional collet chuck, has a geometry complementary to the interface 26 on the base 24 of the lower part 20, which allows a positive-locking and centered with respect to the base axis BA, as well as a rotation angle-oriented and rotationally driven reception of the interface 26. In addition, a fixed stop FA of the joining unit FE is located at a fixed location in the container BH, which interacts with the projection 50 of the orientation aid 34 on the upper part 22, against which, more precisely, the projection 50 can be brought into contact. Finally, a locking member VG, which can be linearly displaced, for example, via a piston-cylinder arrangement, is also provided in the container BH (in Fig. 10 not shown, but in the Fig. 26 to 28 and 33 to 36 indicated), which in cooperation with the fixed stop FA can hold the upper part 22 against twisting on the projection 50 of the orientation aid 34.

[0075] In principle, when the receiving device 10 is provided according to step b), its receiving section 30 may already have a known tilt relative to the base 24. In such a case, in step c) of ensuring the tilt, it only needs to be verified that the desired or required tilt of the receiving section 30 on the receiving device 10 is present. This can be done in the joining unit FE, for example, by measurement using the marking slots 52, 53 on the lower part 20 and upper part 22, whose relative rotational angle position to one another is representative of a specific tilt of the receiving section 30 relative to the base 24 of the receiving device 10.

[0076] However, if the lower part 20 and the upper part 22 of the receiving device 10 are in any relative rotational position to one another about the rotation axis DA, the tilting of the receiving section 30 with respect to the base 24 is correspondingly arbitrary. In this case, step c) of ensuring the desired relative tilting of the receiving section 30 with respect to the base 24 comprises a relative rotation of the upper part 22 and the lower part 20 of the receiving device 10 about the rotation axis DA.

[0077] The Fig. 10 to 13show the receiving device 10 in this undefined, relative rotational position of the lower part 20 and the upper part 22 directly after insertion into the holder HA of the joining unit FE. Starting from this position, the lower part 20 of the receiving device 10 together with the resting upper part 22 of the receiving device 10 is rotated around the base axis BA by rotating the holder HA of the joining unit FE, until the projection 50 of the orientation aid 34 provided on the upper part 22, as shown in the Fig. 15 to 19 illustrated, at the fixed stop FA of the joining unit FE comes into contact.

[0078] Since the upper part 22 of the receiving device 10 is now secured against further rotation by the fixed stop FA, the lower part 20 of the receiving device 10 is rotated relative to the upper part 22 of the receiving device 10 upon further rotation of the holder HA about the base axis BA until, as shown in Fig. 23 from the Fig. 20 to 24shown, the first stop section 68 of the lower part 20 has come into contact with the second stop section 69 of the upper part 22 (contact of the end stop surfaces 71 and 73), i.e. a rotation angle end position of the lower part 20 with respect to the upper part 22 has been reached, in which the receiving section 30 is minimally tilted relative to the base 24, ie not tilted.

[0079] Once this rotational position has been reached, the desired relative rotational position and thus the desired tilting of the receiving section 30 with respect to the base 24 can be set, knowing the relative rotational position between the upper part 22 and the lower part 20 of the receiving device 10. For this purpose, according to the illustrations in the Fig. 25 to 29First, the locking element VG is actuated, which on the side facing away from the fixed stop FA comes into contact with the projection 50 of the orientation aid 34 provided on the upper part 22 and thereby secures the upper part 22 of the holding device 10 against rotation in the opposite direction of rotation. Then, the lower part 20 is rotated according to the rotation arrow in Fig. 27 rotated (back) by the corresponding angle of rotation relative to the upper part 22 of the receiving device 10 to adjust the desired tilting of the receiving section 30.

[0080] Subsequently, the spectacle lens 12 is placed with its first workpiece surface 14 aligned with respect to the receiving axis AA of the receiving device 10 onto the flexible receiving ring 60 on the receiving section 30 of the upper part 22 of the receiving device 10 according to step d), wherein this step comprises centering the spectacle lens 12 with respect to the receiving axis AA of the receiving device 10 and / or orienting the rotation angle of the spectacle lens 12 around the receiving axis AA of the receiving device 10. In a (partially) automated process sequence, the handling system assigned to the spectacle lens 12 must therefore have corresponding degrees of freedom of movement.

[0081] Then, the inner vacuum chamber 40 and the outer vacuum chamber 38 of the receiving device 10 are jointly evacuated in step e) in order to simultaneously secure the upper part 22 and the lower part 20 of the receiving device 10 in their relative rotational position about the rotation axis DA to one another and to secure the spectacle lens 12 to the receiving section 30 of the receiving device 10. In the illustrated embodiment, this is done by applying a vacuum to the evacuable container BH, which is tightly closed by the lid DE, according to Fig. 10 , in which the receiving device 10 and the spectacle lens 12 are now in the desired relative position to each other, via the vacuum connection VA of the container BH.

[0082] In the exemplary embodiment described here, this step is followed by a step f) of removing the receiving device 10 and the spectacle lens 12 received therein from the evacuable container BH, in which the evacuable container BH is first ventilated, namely via the vacuum connection VA and / or by opening the lid DE, while the spectacle lens 12 is pressed against the flexible receiving ring 60 (not shown in the figures) essentially along the receiving axis AA. This pressing prevents the inner vacuum chamber 40 or the outer vacuum chamber 38 of the receiving device 10 from being inadvertently ventilated when the evacuable container BH is ventilated. Reasons for this would be an insufficient contact of one of the sealing surfaces or a compression spring (spring element 82) possibly arranged between the lower part 20 and the upper part 22, as in Fig. 30which optionally facilitates deliberate ventilation of the inner vacuum chamber 40 when separating the spectacle lens 12 and the holding device 10.

[0083] The spectacle lens 12, which may be held prismatically on the holding fixture 10, can now be machined or treated as desired on the free workpiece surface 16. If the spectacle lens 12 needs to be separated from the holding fixture 10 after machining / treatment, it is advisable to reinsert the holding fixture 10 with the spectacle lens 12 into the evacuable container BH and to evacuate it more thoroughly than during the previous joining. This has the effect that the increased pressure in the vacuum chambers 38, 40 tends to force the individual parts apart.

[0084] The above-described holding device 10 and the method presented here make it possible, for example, in the manufacturing process of spectacle lenses 12, to easily hold the respective spectacle lens 12 specifically for a subsequent polishing process – possibly even prismatically – after generating the optically active shape, so that the spectacle lens 12 does not have to be conventionally "blocked" before the subsequent polishing process. The same applies to further treatment steps, such as laser engraving. In this respect, the holding device 10 and the described holding method are particularly predestined for use in a "blockless" manufacturing process for spectacle lenses, as is the subject of the documents DE 10 2021 004 831 A1, DE 10 2021 005 202 A1, and DE 10 2021 005 399 A1, to which further process details are expressly referred at this point.

[0085] A device for holding, in particular, a prismatic spectacle lens on one workpiece surface for machining / treating the other workpiece surface comprises upper and lower parts. The lower part has a base with a mounting interface and a wedge section perpendicular to the base axis. The upper part comprises a spectacle lens receiving section and a wedge section perpendicular to the receiving axis. The lower and upper parts, with their mutually facing wedge sections, are rotatable relative to one another about an axis of rotation inclined with respect to the base and receiving axes in order to tilt the receiving section and base relative to one another.A wedge orientation assembly includes an orientation aid on the upper part and / or a stop between the upper and lower parts to determine / fix the rotational angle position of the upper part around the base axis. This stop defines a relative rotational angle end position of the upper and lower parts that corresponds to a minimum or maximum tilt of the receiving section relative to the base. The outer and inner vacuum chambers of the device can be evacuated together to couple the lower part, upper part, and spectacle lens. LIST OF REFERENCE SYMBOLS

[0086] 10Holding device 12Optical workpiece / spectacle lens 14(First) workpiece surface 16(Second) workpiece surface 18Workpiece edge 20Lower part 22Upper part 24Base 26Interface 28Lower wedge section 30Holding section 32Upper wedge section 34Orientation aid 36Stop 38Outer vacuum chamber 40Inner vacuum chamber 42Height reference surface 44Centering surface 46Rotational drive recess 48Depression 50Protrusion 51Recess 52Marking slot 53Marking slot 54Centering aid 55Sleeve section 56Collar 58End surface 60Flexible holding ring 62Inner peripheral surface 64Sealing ring 66Connecting hole 68First stop section 69Second stop section 70End stop surface 71End stop surface 72End stop surface 73End stop surface 74Hirth toothing 75First toothing section 76Second toothing section 78Locking connection 79Locking hook 80Undercut 82Spring element AAMounting axis BABase axis BHContainer DARotation axis DECover FAFixed stop FEJoining unit HABracket KWWedge angle VAVacuum connection VGLocking link

Claims

1. Device (10) for receiving an optical workpiece (12), in particular a spectacle lens, on a first of two opposite workpiece surfaces (14, 16) for machining or treating the optical workpiece (12) on a second of the workpiece surfaces (14, 16), comprising a lower part (20) with a base (24) having a central base axis (BA) and having an interface (26) for spatially defined attachment to a holder, and a lower wedge section (28) adjoining the base (24) along the base axis (BA) and extending transversely to the base axis (BA), and an upper part (22) with a receiving section (30) for the optical workpiece (12), having a central receiving axis (AA), and an upper wedge section (32) adjoining the receiving section (30) along the receiving axis (AA) and extending transversely to the receiving axis (AA), wherein the lower part (20) and the upper part (22) are arranged with the mutually facing,lower and upper wedge sections (28, 32) are rotatable relative to one another about a common axis of rotation (DA) which is inclined with respect to the base axis (BA) and the receiving axis (AA), so that a relative rotation of the upper part (22) and lower part (20) about the axis of rotation (DA) causes a relative tilting of the receiving section (30) with respect to the base (24), , characterized by a wedge orientation arrangement with an orientation aid (34) on the upper part (22), via which an angular position of the upper part (22) about the base axis (BA) can be determined and / or the upper part (22) can be fixed in an angular position about the base axis (BA), and / or with a stop (36) between the upper part (22) and the lower part (20), which stop defines at least one angular end position of the upper part (22) with respect to the lower part (20) about the axis of rotation (DA), in which the receiving section (30) on the upper part (22) is minimally or maximally tilted relative to the base (24) of the lower part (20).

2. Device (10) according to claim 1, characterized in that the orientation aid (34) has a projection (50) which extends substantially radially outward from the upper wedge section (32) of the upper part (22) with respect to the axis of rotation (DA), or has a recess (51) in the upper part (22) which extends substantially radially inward with respect to the axis of rotation (DA).

3. Device (10) according to claim 1 or 2, characterized in that the stop (36) has a first stop section (68) on the lower part (20) which cooperates with a second stop section (69) of the stop (36) on the upper part (22).

4. Device (10) according to claim 3, characterized in thatthe first stop section (68) and the second stop section (69) of the stop (36) are each designed in the form of a ring segment of 90° when viewed in a plan view along the axis of rotation (DA) and each have two end-side stop surfaces (70, 71, 72, 73) when viewed in a circumferential direction around the axis of rotation (DA), wherein one of the stop surfaces (70, 71) of the first stop section (68) interacts with one of the stop surfaces (72, 73) of the second stop section (69) in order to determine the maximum tilting of the receiving section (30) on the upper part (22) relative to the base (24) of the lower part (20), while another of the stop surfaces (70, 71) of the first stop section (68) interacts with another of the stop surfaces (72, 73) of the second stop section (69) in order to determine the minimum tilting of the receiving section (30) on the upper part (22) relative to the base (24) of the lower part (20).

5. Device (10) according to one of the preceding claims, characterized in that a relative angular position of the upper part (22) and lower part (20) around the axis of rotation (DA) can be positively secured in stages.

6. Device (10) according to claim 5, characterized in that a Hirth toothing (74) is formed between the upper part (22) and the lower part (20), with a first toothing section (75) on an upper side of the lower part (20) and a second toothing section (76) complementary to the first toothing section (75) on an underside of the upper part (22).

7. Device (10) according to claim 6, characterized in thatthe Hirth toothing (74) has a number of teeth between 28 and 36 teeth and / or the individual teeth of the Hirth toothing (74) have a tooth height of between 1 mm and 3 mm at the radially outer edge of the teeth with respect to the axis of rotation (DA) and / or the individual teeth of the Hirth toothing (74) lie within a circle around the axis of rotation (DA) which has a radius of between 15 mm and 20 mm with respect to the axis of rotation (DA).

8. Device (10) according to one of the preceding claims, characterized in that a flexible receiving ring (60) is attached to the receiving section (30) of the upper part (22), on which the optical workpiece (12) can be placed with its first workpiece surface (14).

9. Device (10) according to claim 8, characterized in thatthe flexible receiving ring (60) is made of NBR or EPDM and / or has a SHORE A hardness between 15 and 80, preferably between 20 and 50 and / or has a material thickness between 1.0 mm and 8.0 mm, preferably between 2.0 mm and 5.0 mm.

10. Device (10) according to claim 8 or 9, characterized by an outer vacuum chamber (38) on the upper part (22), which is delimited by at least one end face (58) of the receiving section (30) on the upper part (22) and an inner peripheral surface (62) of the flexible receiving ring (60) and can be evacuated for releasably holding the optical workpiece (12) placed on the flexible receiving ring (60) on the first workpiece surface (14).

11. Device (10) according to one of the preceding claims, characterized in thatthe lower part (20) and the upper part (22) define an inner vacuum chamber (40) which is sealed from the environment by a sealing ring (64) and which can be evacuated in order to releasably hold the upper part (22) in a predetermined rotational angular position about the rotation axis (DA) on the lower part (20).

12. Device (10) according to claims 10 and 11, characterized in that the inner vacuum chamber (40) is pneumatically connectable or connected to the outer vacuum chamber (38), the latter preferably via a connecting hole (66) in the receiving section (30) of the upper part (22).

13. Device (10) according to one of the preceding claims, characterized in thata spring element (82) is arranged between the lower part (20) and the upper part (22) in order to generate a prestressing force between the lower part (20) and the upper part (22), which prestressing force stretches the lower part (20) and the upper part (22) apart, and / or that a latching connection (78) is formed between the lower part (20) and the upper part (22), which latching connection secures the upper part (20) with play against being lost on the lower part (22), preferably comprising a plurality of flexible latching hooks (79) on one part, which interact with an undercut (80) on the other part, and / or that a centering aid (54) is formed between the lower part (20) and the upper part (22), which aligns the upper part (20) and the lower part (22) with respect to the common axis of rotation (DA), preferably comprising a substantially hollow-cylindrical sleeve section (55) on the one part, which interacts with a substantially cylindrical collar (56) on the other part.

14. A method for receiving an optical workpiece (12), in particular a spectacle lens, with a first of two opposite workpiece surfaces (14, 16) on a receiving device (10) for machining or treating the optical workpiece (12) on a second of the workpiece surfaces (14, 16), comprising the following steps: a) providing the optical workpiece (12) to be machined or treated; b) providing the receiving device (10) for the optical workpiece (12), comprising a lower part (20) with a base (24) having a central base axis (BA) and having an interface (26) for spatially defined attachment to a holder, and a lower wedge section (28) adjoining the base (24) along the base axis (BA) and extending transversely to the base axis (BA),and an upper part (22) with a receiving section (30) for the optical workpiece (12), which has a central receiving axis (AA), and an upper wedge section (32) which adjoins the receiving section (30) along the receiving axis (AA) and runs transversely to the receiving axis (AA), wherein the lower part (20) and the upper part (22) with the mutually facing lower and upper wedge sections (28, 32) are rotatable relative to one another about a common axis of rotation (DA), which is inclined with respect to the base axis (BA) and the receiving axis (AA), so that a relative rotation of the upper part (22) and lower part (20) about the axis of rotation (DA) causes a relative tilting of the receiving section (30) with respect to the base (24), wherein the receiving device (10) additionally has a flexible receiving ring (60) on the receiving section (30),an outer vacuum chamber (38) delimited at least by an end face (58) of the receiving section (30) and an inner circumferential surface (62) of the flexible receiving ring (60), as well as an inner vacuum chamber (40) sealed from the environment by a sealing ring (64) between the lower part (20) and the upper part (22); c) ensuring that the desired relative tilt of the receiving section (30) on the upper part (22) with respect to the base (24) of the lower part (20) is present; d) placing the optical workpiece (12) with its first workpiece surface (14) on the flexible receiving ring (60) on the receiving section (30) of the upper part (22) of the receiving device (10), aligned with the receiving axis (AA) of the receiving device (10); and e) jointly evacuating the inner vacuum chamber (40) and the outer vacuum chamber (38),to simultaneously secure the upper part (22) and lower part (20) of the receiving device (10) in their relative rotational position about the axis of rotation (DA) to one another and to secure the optical workpiece (12) to the receiving section (30) of the receiving device (10).

15. The method according to claim 14, wherein step c) of ensuring the desired relative tilting of the receiving section (30) with respect to the base (24) comprises a relative rotation of the upper part (22) and lower part (20) of the receiving device (10) about the axis of rotation (DA); and / or step d) of placing the optical workpiece (12) aligned with respect to the receiving axis (AA) of the receiving device (10) comprises a centering of the optical workpiece (12) with respect to the receiving axis (AA) of the receiving device (10) and / or an angular orientation of the optical workpiece (12) about the receiving axis (AA) of the receiving device (10); and / or at least step e) is carried out in an evacuable container (BH) into which the receiving device (10) and the optical workpiece (12) are inserted;and / or if step e) is carried out in an evacuable container (BH), a step f) of removing the receiving device (10) and the optical workpiece (12) received thereon from the evacuable container (BH) follows, in which step the evacuable container (BH) is first ventilated, while the optical workpiece (12) is pressed against the flexible receiving ring (60) substantially along the receiving axis (AA);

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