Polishing machine for processing an optical surface of a spectacle lens, method for polishing optical surfaces of spectacle lenses and method for manufacturing a spectacle lens

Description

[0001] The present invention relates to the field of optics, and more particularly to a polishing machine for polishing an optical surface of a spectacle lens and a holding device for use in the polishing machine. The invention further relates to a method for polishing an optical surface of a spectacle lens and a method for manufacturing a spectacle lens with an optical surface.

[0002] The industrial polishing of progressive lenses made of plastic or mineral materials involves removing machining structures such as microroughness, turning grooves, grinding marks, waviness, and center defects from a freeform surface previously produced by turning, milling, or grinding, thus creating surfaces with the required optical properties. In particular, it is desirable to achieve surfaces of high optical quality.

[0003] A polishing head for polishing machines is known from DE 101 00 860 A1. The polishing head has a polishing plate connected to a rotationally driven drive shaft. The polishing plate is connected to the drive shaft in an articulated and rotationally fixed manner. A ball-and-socket joint can be provided for the articulated, rotationally fixed connection. The articulated connection allows the polishing plate to rotate and follow the surface of the workpiece to be machined, ensuring that the polishing pad always rests on the surface over a maximum area. A pressure chamber is also provided. Pressurizing the pressure chamber results in a translational movement of the polishing plate along a center axis of the polishing head.

[0004] DE 10 2014 015 053 A1 discloses a device for the precision machining of optically effective surfaces, particularly on ophthalmic lenses as workpieces. The device comprises a workpiece spindle extending into a work space, via which a workpiece to be polished can be driven in rotation about a workpiece rotation axis. The device further comprises two tool spindles assigned to the workpiece spindle and extending into the work space opposite one another. A polishing tool is mounted on each tool spindle, which can be driven in rotation about a tool rotation axis and is axially adjustable along the tool rotation axis.

[0005] DE 10 2013 220 973 A1 discloses a tool for polishing optical surfaces. The tool comprises a base body having an active surface facing the optical surface. Furthermore, the tool comprises an intermediate layer arranged on the active surface of the base body and a polishing agent carrier arranged on the intermediate layer. The intermediate layer projects radially beyond the active surface of the base body. The polishing agent carrier projects radially beyond the intermediate layer. Due to the axial deformability of the intermediate layer, a polishing surface formed by a polishing agent carrier can, to a certain extent, adapt to the height profile of a glass to be processed in the axial direction.

[0006] DE 20 2015 009 504 U1 discloses a polishing pad for a tool for fine machining optically effective surfaces on spectacle lenses, comprising a base body having a central axis, to which an intermediate layer made of an elastic material is attached, which is softer than the base body and on which a polishing agent carrier rests. The intermediate layer has at least two regions of different hardness, which are arranged one behind the other in the direction of the central axis and are formed by different foam layers. The foam layer adjacent to the base body is softer than the foam layer on which the polishing agent carrier rests. Determined for the case of full-surface compression, the static E-modulus of the harder foam layer is between 0.40 and 1.50 N / mm 2 , while the static E-modulus of the softer foam layer is between 0.25 and 0.45 N / mm 2 .

[0007] US 7,033,261 B2 discloses a tool for surface treatment of an optical surface. The tool comprises a carrier with a transverse end face and an elastically compressible interface.

[0008] DE 199 26 414 A1 discloses a combination tool for machining optical lenses, comprising a cup tool and a forming tool. The forming tool is axially displaceable and has a certain angular mobility. The combination tool is connected to a driven tool spindle that rotates in the same direction as the lens to be machined. The forming tool has a spherical peripheral surface that is connected to a cylindrical peripheral surface in the cavity of the combination tool with minimal bearing play. Between the central body and the forming tool, there is an elastic membrane that is firmly connected to the central body. The back of the membrane is connected to a bore, which in turn is connected to a bore. The bore, in turn, is connected to a rotary feedthrough and other devices of the processing machine, with which the bore can be subjected to negative or positive pressure.There is at least one stop that limits the forward stroke of the forming tool.

[0009] US 5,291,692 discloses a workpiece holder comprising a holder body, a recess portion, and a lens holder having a hole connected to a suction hole for sucking and holding a lens at an end surface.

[0010] DE 39 34 180 A1 discloses a holding device for an element to be ground. This device is designed to vary the pressure exerted on a support surface of the optical element on a support base in the radial direction to prevent deformation, positional deviation, or inclination of the optical element, which may occur due to grinding resistance during grinding or due to high-pressure grinding. An elastic element is provided as the support element, or a support element is used, which can compensate for the positional deviation, inclination, or the like of the optical element during grinding.

[0011] DE 12 35 179 B discloses a guide device for grinding toric lenses by means of a rotating tool corresponding to the toric surface to be produced, the support of which has resilient and laterally mounted torsion-free connecting members for the lens holder, which convert the circular orbital movements for the workpiece generated by a pin seated eccentrically in a drive spindle into synchronous rotary movements and movements keeping it aligned with the toric meridians.

[0012] Freeform surfaces, which combine a progressive lens surface with a prescription surface with toric curvatures, present a particular challenge in polishing. It is desirable to achieve highly precise, flawless processing, with minimal processing time for economic reasons, and use simple, cost-effective polishing tools.

[0013] The inventors have recognized that in devices known from the prior art, significant shape defects can occur during the polishing process, particularly in surface areas of a curved torus main axis of the glass, which deteriorate the quality of the manufactured product.

[0014] The inventors have further recognized that conventional polishing devices can have other adverse effects, in addition to an uneven removal distribution of the glass surface, such as vibrations and rattling of the polishing machine.

[0015] Vibration and chatter effects can also have a negative impact on the service life of the spindles and thus cause additional follow-up costs.

[0016] Against this background, one object of the present invention may be to provide a polishing machine for processing optical surfaces of spectacle lenses that enables more uniform material removal during polishing. Alternatively or additionally, it would be desirable to provide a polishing machine that requires less maintenance, particularly with regard to the service life of the spindles.

[0017] To achieve this object, a polishing machine for machining an optical surface of a spectacle lens and a method for polishing optical surfaces according to the independent claims are proposed.

[0018] According to a first aspect of the invention, a polishing machine for processing an optical surface of a spectacle lens is proposed, according to claim 1. The polishing machine comprises two receiving devices and an elastic bearing. Each of the two receiving devices has a receiving element for reversibly receiving a body. The elastic bearing is arranged between the two receiving devices. The elastic bearing can be arranged in a mechanical connection between the two receiving devices, which connects the two receiving devices to each other.

[0019] In machining processes such as turning or milling, a rigid coupling between two fixtures is considered advantageous, for example, between a workpiece holder and a milling head. Such a rigid coupling ensures high positioning accuracy between the tool and the workpiece. Especially in the free-form machining of optical surfaces, this ensures that the specified and actual travel paths of the machine match.

[0020] The inventors have recognized that a supposedly desirable very high positioning accuracy in a polishing machine for optical surfaces can, however, have exactly the opposite effect. Instead, a damping coupling, thus moving away from rigid coupling, can be advantageous in a polishing machine. This is surprising in that the quality and dimensional accuracy of an optical surface can be improved by allowing larger path deviations instead of smaller path deviations of a processing machine. This can be achieved by providing an elastic bearing between the two holding devices (e.g., tool holder and workpiece holder) in the proposed polishing machine.

[0021] For example, at least one of the two receiving devices can have the elastic bearing. Alternatively or additionally, the elastic bearing can be arranged on or in a mechanical connection between the two receiving elements.

[0022] The elastic bearing can be arranged between two rigid elements. One of the two rigid elements can be a first rigid element, and the other rigid element can be a second rigid element.

[0023] The first rigid element and / or the second rigid element can, for example, have a compression modulus selected from the group of at least 2 GPa, at least 35 GPa, at least 70 GPa, at least 100 GPa, and at least 150 GPa. The first rigid element and / or the second rigid element can, for example, have a modulus of elasticity selected from the group of at least 1 GPa, at least 8 GPa, at least 50 GPa, at least 100 GPa, and at least 200 GPa.

[0024] The first rigid element and / or the second rigid element can, in particular, be designed independently of a machine bed or machine frame. For example, the first rigid element and / or the second rigid element can be configured to create a reversible connection to a machine bed and / or to a machine frame.

[0025] The elastic bearing can enable a relative movement between the two holding devices selected from the group of 250 µm to 1 cm, and from 500 µm to 4 mm. Optionally, a value from the group of 250 µm, 500 µm, 750 µm, 1 mm, 2 mm or 3 mm can be selected as the lower limit. Optionally, a value from the group of 1 cm, 7 mm, 5 mm, 3 mm, 2 mm or 1 mm can be selected as the upper limit. The relative movement can in particular be a range of motion. The relative movement can preferably be carried out perpendicular to an axis of a holding device. The axis can be an axis of rotation for a rotary polishing movement of one of the holding elements.

[0026] One of the two receiving devices can be designed for the reversible reception of a polishing tool and the other of the two receiving devices can be designed for the reversible reception of a workpiece, in particular for the reversible reception of a spectacle lens.

[0027] The elastic bearing can, for example, have a modulus of elasticity selected from the group of 0.5 N / mm 2 to 25 N / mm 2 , from 1.0 N / mm 2 to 2 N / mm 2 , and from 1.5 N / mm 2 to 2 N / mm 2 . The elastic bearing can, for example, have a modulus of compression selected from the group of less than 2 GPa, less than 1 MPa, less than 1 kPa, and less than 1 Pa.

[0028] The elastic bearing can, for example, be configured to guide a movement of a first element relative to a second element. In particular, the elastic bearing can be configured to guide a movement of the first rigid element relative to the second rigid element.

[0029] At least one of the receiving elements can, for example, be configured to receive the respective body, for example a tool or a workpiece. In particular, the receiving element can be configured to reversibly connect the body to the receiving device, for example by means of a screw connection and / or by means of a clamp connection and / or by means of a click connection.

[0030] A "reversible receiving of the body" can be understood in particular to mean that the body can be connected and separated from the receiving element without damaging the body and / or the receiving element, preferably as frequently as desired.

[0031] The inventors recognized that even in a static case, an elastic tool subjected to pressure on an irregularly curved glass surface is compressed to varying degrees locally. Taking into account the locally varying compression rate of the elastic tool and the resulting locally varying pressure, a glass area located beneath a tool experiences locally varying compressive stress depending on its curvature. Such an effect also operates analogously in a dynamic case of the ongoing polishing process. Specifically, this effect can lead to local valleys in a concave or convex surface, or those surfaces from which the polishing tool is moving away, always experiencing lower pressure and thus also lower polishing removal.

[0032] In the dynamic case, this effect of inhomogeneous compressive stress can be particularly pronounced on toric surfaces and on freeform surfaces that have strong radii of curvature, for example due to a large toric surface portion. In this case, height differences between a flat and a curved main axis in the outer region of the lens can easily amount to several millimeters. During a polishing process, a polishing tool subjected to polishing pressure and correspondingly compressed is additionally compressed in both strongly curved regions of the more strongly curved torus main axis during one lens revolution, twice per lens revolution. During a single lens revolution, the tool thus describes an approximately sinusoidal height movement. The tool is therefore guided following the surface contour twice to the lowest point and twice to the highest point of the respective radial position of the lens.Typically, a lens with a higher toric surface area rotates at a speed of, for example, 700 to 1000 rpm, resulting in a compression frequency of approximately 23 to 33 Hz. During such a polishing process, corresponding pressure peaks usually occur in the locally strongly curved areas of the lens.

[0033] In particular, pressure peak components acting at high frequencies perpendicular to a workpiece axis or rotation axis, i.e., horizontal, are ignored in prior art devices or are even cushioned by elements of the spindle design. They act entirely at the corresponding points on the glass surface, causing additional, highly undesirable material removal.

[0034] According to one aspect of the present disclosure, a polishing machine is proposed, wherein an elastic bearing can be arranged between two rigid elements, and wherein the elastic bearing can be arranged on a side facing away from or opposite to a receiving element.

[0035] The polishing machine can be configured, for example, to compensate for laterally directed and / or high-frequency pressure peaks by means of a corresponding tilting movement. The laterally directed pressure peaks can, for example, be pressure peaks that act at an angle of 10° to 170°, in particular of 45° to 135°, in particular of 90° to an axis, for example an axis of symmetry or a rotation axis of the holding device, for example on the first rigid element and / or on the second rigid element. The high-frequency pressure peaks can be pressure peaks with a frequency of 5 Hz to 100 kHz, in particular of 10 Hz to 40 Hz, in particular of 23 Hz to 33 Hz. Furthermore, the polishing machine, in particular at least one of the holding devices, can also compensate for pressure peaks acting in the axial direction. The disclosed elastic bearing can, in particular, have a damping effect.In particular, horizontally directed pressure peaks can be absorbed elastically.

[0036] The polishing machine can be configured, in particular, to reduce impacts and / or lateral force peaks on a spectacle lens or an optical surface of a spectacle lens to be polished, thus achieving a better surface quality. Without the elastic bearing, greater material removal could occur at those locations where a higher force acts during a polishing process. For example, without the elastic bearing, the shape of a high-precision, free-form surface of a spectacle lens could be distorted again during the polishing process.

[0037] The elastic bearing can be configured, in particular, to absorb airborne sound and / or structure-borne sound, in particular by converting kinetic energy into thermal energy, for example, through friction effects within the elastic bearing. Alternatively or additionally, the elastic bearing can be configured to define a natural frequency of the receiving device such that resonance phenomena cannot occur or can be suppressed by a rotational movement of the body or a motor of a polishing machine.

[0038] For example, vibrations can be damped by converting kinetic energy into thermal energy, for example through friction effects within the elastic bearing.

[0039] According to a third aspect of the present invention, a method for polishing an optical surface of a spectacle lens according to claim 8 is proposed.

[0040] The first body can be the spectacle lens. The second body can be the polishing tool. The method can further comprise the step of providing a polishing machine for machining an optical surface of a spectacle lens, wherein the polishing machine has two receiving devices and an elastic bearing, each of the two receiving devices having a receiving element, wherein the elastic bearing is arranged between the two receiving devices.

[0041] According to a fourth aspect of the present invention, a method for producing a spectacle lens having an optical surface is proposed, wherein a polishing processing of the optical surface of the spectacle lens is carried out by the above-mentioned polishing processing method.

[0042] The holding device can, for example, be a substantially rotationally symmetrical device. For example, the holding device can have a layered structure along an axis of symmetry. In particular, the holding device can be designed in a spindle-like manner, for example, as a tool spindle or a workpiece spindle.

[0043] An optical surface can be understood as the front surface or the object-side surface of a spectacle lens. According to DIN EN ISO 13666:2013-10, Section 5.8, the front surface of a spectacle lens is the surface of a spectacle lens that is intended to face away from the eye in the spectacles. Alternatively or additionally, an optical surface can be understood as the back surface or the eye-side surface of a spectacle lens. According to DIN EN ISO 13666:2013-10, Section 5.9, the back surface of a spectacle lens is the surface of a spectacle lens that is intended to face the eye in the spectacles.

[0044] The optical surfaces can be freeform surfaces, in particular toric freeform surfaces. In the broader sense, a freeform surface is understood to be a complex surface that can be represented in particular using exclusively (in particular piecewise) polynomial functions (in particular polynomial splines, such as bicubic splines, higher degree splines of fourth degree or higher, Zernike polynomials, Forbes surfaces, Chebyshev polynomials, Fourier series, polynomial non-uniform rational B-splines (NURBS)). These must be distinguished from simple surfaces, such as spherical surfaces, aspherical surfaces, cylindrical surfaces, toric surfaces or the surfaces described in WO 89 / 04986 A1, which are described as a circle at least along the main meridian (cf. ibid. p. 12, lines 6-13). In other words, freeform surfaces cannot be represented in the form of classical regular solids such asspherical surfaces, aspherical surfaces, cylindrical surfaces, toric surfaces or also the surfaces described in WO 89 / 04986 A1 (see e.g. https: / / www.computerwoche.de / a / die-natur-kennt-auch-nur-freiformflaechen,1176029 downloaded on 18.1.2018; http: / / www.megacad.de / kennenlernen / megacadschulungen / schulungsinhalte / schulung-freiformflaechen.html downloaded on 18.1.2018) but for example by means of exclusively (in particular piecewise) polynomial functions (in particular polynomial splines, such as bicubic splines, higher degree splines of fourth degree or higher, Zernike polynomials, Forbes surfaces, Chebyshev polynomials, Fourier series, polynomial non-uniform rational B-splines (NURBS)). Freeform surfaces can therefore be surfaces that do not correspond to any regular geometry (see e.g. https: / / www.infograph.de / de / nurbs downloaded on 18.1.2018; https: / / books.google.com / books?hl=en&hl=en&src=src ...de / books?id=QpugBwAAQBAJ&pg=PA101&lpg=PA101&dq=regelge ometrie+definition&source=bl&ots=CJjmQwghvo&sig=MvsGv0sqbAVEygCaW-JQhfJ99jw&hl=de&sa=X&ved=0ahUKEwi_jcD5y-HYAhXDXCwKHUaQCBw4ChDoAQ gsMAI#v=onepage&q=regelgeometrie%20definition&f=false downloaded on 18.1.2018) or which cannot be described using forms of analytical geometry (see e.g. https: / / books.google.de / books?id=LPzBgAAQBAJ&pg=PA26&Ipg=PA26&dq= regelgeometrie+definition&source=bl&ots=e1upL5jinn&sig=hUNimu8deH5x8OvCiYsa242 ddn8&hl=de&sa=X&ved=0ahUKEwi_jcD5y-HYAhXDXCwKHUaQCBw4ChDoAQgv MAM#v=onepage&q=regelgeometrie%20definition&f=false downloaded on January 18, 2018). The freeform surface can also be a freeform surface in the narrower sense according to Section 2.1.2 of DIN SPEC 58194 from December 2015, namely a surface manufactured using freeform technology that is mathematically described within the limits of differential geometry and is neither point-symmetric nor axially symmetric.Furthermore, in particular, the freeform surface may not have any point symmetry, any axial symmetry, any rotational symmetry or any symmetry with respect to a plane of symmetry.

[0045] In particular, the optical surface can be a front and / or back surface of a progressive lens made of plastic, e.g., CR39, polycarbonate, or a material with a higher refractive index. Alternatively, the optical surfaces can be surfaces of progressive lenses made of mineral materials. In principle, the optical surface can be a surface designed to change the optical properties of incident light, e.g., with regard to a propagation direction.

[0046] The receiving device can have the receiving element for reversibly receiving a body at one end of the receiving device. The term "at one end" can be understood in particular to mean that the receiving element is a last element along an axis, e.g., a rotational axis, of the receiving device. The receiving element can, for example, have at least one element selected from the group comprising a workpiece holder, clamping jaws, a click connection, a lens holder, and a mirror holder.

[0047] The term "reversible mount" can be understood in particular to mean that the body can be fixed to the mount element in such a way that the body can be removed again without destroying the body or the mount. The body can, for example, be a workpiece. In particular, the body can be the workpiece with the optical surface to be machined. The body can, for example, be a lens or a mirror or another optical element. Alternatively, the body can be a tool, for example, a polishing tool.

[0048] For example, the body can be a tool for polishing optical surfaces as described in DE 10 2013 220 973 A1. The body can thus comprise a base body having an active surface facing the optical surface. Furthermore, the body can have an elastic intermediate layer arranged on the active surface of the base body and a polishing agent carrier arranged on the elastic intermediate layer. For example, the elastic intermediate layer can project radially beyond the active surface of the base body, and the polishing agent carrier can project radially beyond the elastic intermediate layer.

[0049] A body can be understood, in particular, as a polishing tool. Furthermore, a body can be understood as a spectacle lens. In particular, a first body can be a polishing tool, and a second body can be a spectacle lens (with an optical surface to be processed).

[0050] The elastic bearing can be arranged on the side of the receiving device opposite the receiving element. The side opposite the receiving element can in particular be a section furthest away from the receiving element, for example a half of the receiving device furthest away from the receiving element, in particular a third of the receiving device furthest away from the receiving element, in particular a quarter of the receiving device furthest away from the receiving element. The elastic bearing can in particular be arranged at least partially, preferably completely, on the side opposite the receiving element. For example, the receiving device can have the elastic bearing at the end opposite the receiving element.The side opposite the receiving element can in particular be a side which, after the body has been received by the receiving element, is arranged opposite the body and the receiving element.

[0051] The elastic bearing can, for example, be designed as an elastic layer. In particular, the elastic bearing can be configured to prevent or dampen vibrations. In particular, the elastic bearing can have an elastic and damping effect. The elastic bearing can, for example, enable a tilting movement of an underside of the elastic bearing relative to an upper side of the elastic bearing, in particular without deforming a surface of the underside of the elastic bearing and / or without deforming a surface of the upper side of the elastic bearing. The underside of the elastic bearing can point away from the receiving element. The upper side of the elastic bearing can point towards the receiving element. The elastic bearing can, for example, be an elastic base, in particular to serve as a barrier for vibrations to or from an environment. The elastic bearing can isolate the receiving device from the environment with regard to vibrations.

[0052] The elastic bearing can be arranged between two rigid elements. For example, the elastic bearing can be arranged between a first rigid element and a second rigid element. The first rigid element and / or the second rigid element can be part of the receiving device. For example, the first rigid element and / or the second rigid element can be part of the polishing machine. Alternatively, the first rigid element and / or the second rigid element can be part of an environment of the receiving device. In one embodiment, the body is not one of the two rigid elements. In particular, the spectacle lens cannot be counted among the two rigid elements. For example, the first rigid element and / or the second rigid element can be the receiving element. A rigid element can be an inelastic element.

[0053] At least one of the two rigid elements, or both rigid elements, can be designed, for example, such that an upper side and / or a lower side of the elastic bearing cannot be deformed. The first rigid element and / or the second rigid element can, for example, be a rigid layer, e.g. made of metal. The first rigid element and / or the second rigid element can, in particular, be designed such that, upon elastic deformation of the elastic bearing, the upper side and the lower side of the elastic bearing are not (or not significantly) deformed. The upper side can, in particular, be the side facing the receiving element. The lower side can preferably be the side facing opposite the receiving element.For example, the first rigid element and / or the second rigid element can cover the entire underside of the elastic bearing and / or the entire top side of the elastic bearing. Alternatively, the first rigid element and / or the second rigid element can cover, for example, at least 80%, in particular at least 50%, in particular at least 30% of the top side of the elastic bearing and / or the underside of the elastic bearing. For example, the first rigid element and / or the second rigid element can be an element that cannot perform any relative movement to the top side of the elastic bearing and / or the underside of the elastic bearing. The first rigid element and / or the second rigid element can in particular be designed to prevent deformation of the top side of the elastic bearing and / or the underside of the elastic bearing.

[0054] The polishing machine can be and / or comprise a horseshoe-shaped or U-shaped device. The elastic bearing can be arranged between the two arms of the U-shaped device or in a mechanical connection between the two arms. The first of the two mounting devices can be arranged on a first of the two arms. The second of the two mounting devices can be arranged on a second of the two arms.

[0055] The elastic bearing can be arranged, for example, within the polishing tool holder or within the workpiece holder. Alternatively, the elastic bearing can be arranged outside the polishing tool holder or the polishing tool. For example, the elastic bearing can be arranged on a mechanical coupling between a holding device for holding the polishing tool and a holding device for holding the workpiece.

[0056] For example, the polishing machine may have a connecting element such as an arm. The connecting element or arm may be configured to mechanically couple the two receiving devices to each other. The elastic bearing may be arranged in the connecting element or arm.

[0057] For example, the elastic bearing can be arranged in such a way that an (elastic) lateral movement is enabled between a receiving element designed as a tool holder and a receiving element designed as a workpiece holder.

[0058] The receiving element can be designed for the reversible reception of a polishing tool and / or for the reversible reception of a workpiece, for example a free-form surface, in particular a lens, in particular a spectacle lens.

[0059] The elastic bearing can in particular be designed to dissolve a fixed positional relationship between the two rigid elements, for example between the polishing tool and a further receiving element and / or between the tool holder and the workpiece holder.

[0060] In conventional manufacturing machines, a fixed alignment is mandatory to achieve the desired positioning accuracy, for example, in turning processes for machining free-form surfaces. The present invention proposes a departure from this fixed alignment by deliberately allowing a certain amount of play through the elastic bearing.

[0061] At first glance, the resulting reduction in positioning accuracy seems counterintuitive. However, the inventors have recognized that the increased play created by the elastic bearing can advantageously reduce force peaks during the polishing of ophthalmic lenses, especially when using optical freeform surfaces.

[0062] The inventors have recognized that, in a method for polishing the optical surfaces of ophthalmic lenses, unlike, for example, shaping machining, highly precise positioning of the polishing tool holder relative to the workpiece holder does not need to be ensured, especially not in every phase of machining. The inventors have particularly recognized that, for example, a tool spindle deflecting relative to a workpiece spindle at the moment of a stress peak in precisely operating milling, grinding, or turning machines can lead to an undesirable shape error on the workpiece. In cases of shaping machining, a vibration-damping coupling between a tool spindle and a workpiece spindle would be a disadvantage, in contrast to polishing.

[0063] The inventors have particularly recognized that during polishing with an elastic, large-area polishing tool, for example with the polishing tool, in particular when polishing a free-form lens, a slight evasive movement can or even should be permitted in phases of extreme pressure peaks.

[0064] In the process for polishing optical surfaces of ophthalmic lenses, the vibration-damping coupling of the polishing tool to the workpiece holder can actually be advantageous. The resulting deflection movement can reduce short-term pressure peaks. This can lead to fewer form errors over the entire polishing process compared to a rigid construction.

[0065] The receiving device can be a polishing tool holder. The receiving element can be designed to reversibly receive a polishing tool. In particular, the receiving device can be an elastically mounted tool holder, for example for a polishing tool. The polishing tool holder can be drivable. In particular, the receiving device or a part of the receiving device, for example the receiving element, can be drivable. For example, at least a part of the receiving device can be driven by a motor included in the receiving device or by an external motor. Alternatively, the receiving device, in particular the receiving element, can be passively drivable, for example by contact with a rotating device. The body can be, for example, a polishing plate for polishing. In one embodiment, the body can be a polishing tool. The receiving element can be a receptacle for the polishing tool. The receiving device can, for example,an elastically mounted tool holder for polishing free-form surfaces.

[0066] The holding device may have a joint. The joint may be an element configured to reversibly change an angle between two elements of the holding device. The angle may, for example, be fixed or fixable during a polishing process. Alternatively, the angle may follow the topography of the optical surface during a polishing process.

[0067] The joint can be a ball joint. The joint can be arranged between the receiving element and the elastic bearing. For example, the joint can be arranged between the first rigid element and the receiving element. In particular, the joint can be arranged between the second rigid element and the receiving element. For example, the first rigid element and / or the second rigid element can be part of the joint, in particular a part of the joint that cannot perform any relative movement to the surface of the elastic bearing and / or to the underside of the elastic bearing.

[0068] The receiving device can have a bellows. The bellows can be designed to protect the joint, for example from liquids or dust. Furthermore, the bellows can be designed to enable movement of the joint. The bellows can be arranged, for example, between the receiving element and the elastic bearing. In particular, the bellows can be arranged between the first rigid element and the receiving element or between the second rigid element and the receiving element. The bellows can, for example, be arranged around the joint, in particular to protect the joint, for example from liquids or dust. The bellows can comprise the first rigid element and / or the second rigid element. The first rigid element and / or the second rigid element can be designed to fix the bellows to the elastic bearing.The bellows can be arranged in such a way that it serves to transmit a torque from a driven element, for example a driven tool spindle or a driven workpiece spindle, to the body, for example a polishing body or a workpiece.

[0069] The receiving device can, for example, have a clamping device configured to attach the receiving device to a drive unit. The drive unit can be a motor, in particular an electric motor. The clamping device can, for example, be configured to reversibly connect the receiving device to the drive unit.

[0070] The receiving device can have a shaft for attachment to a spindle at the end opposite the receiving element. The elastic bearing can be arranged, for example, between the shaft and the joint or between the shaft and the bellows. For example, the first rigid element and / or the second rigid element can be the shaft or the clamping device.

[0071] The elastic bearing can be designed with closed cells. The elastic bearing can, for example, have a structure comprising a large number of cells or cavities. For example, the elastic bearing can have essentially spherical cavities. The cavities can lie closely together or at least partially merge into one another. The cavities can, for example, be filled with air or another gas. The closed-cell elastic bearing can, in particular, essentially have cavities that are separate from one another. Separate cavities can, in particular, prevent or suppress air exchange between the cavities or between the elastic bearing and the environment. The elastic bearing can be designed with closed cells in such a way that capillary action on liquids is suppressed or excluded.This can be particularly advantageous to prevent liquids, such as polishing paste, from penetrating the elastic bearing and, for example, destroying it or reducing its service life. The elastic bearing can be sealed against liquids, especially polishing paste.

[0072] At least one of the two mounting devices of the polishing machine can, for example, have an axis. In the context of the present invention, the term "axis" can be understood to mean a longitudinal axis. The longitudinal axis can indicate the direction of the greatest extent of the mounting device. The axis can be a virtual line. The axis can extend between the end with the mounting element and the side with the elastic bearing. The axis can, for example, be an axis of symmetry. In particular, the axis can be a mirror symmetry axis or a rotational symmetry axis. The axis can be an axis of rotation. The axis can, in particular, be arranged parallel to a shaft or a spindle.

[0073] The elastic bearing can be designed in particular to absorb forces perpendicular to the axis. For example, the axis can be an axis of symmetry of the joint when the joint is fully extended. The elastic bearing can be designed, for example, to absorb both forces acting perpendicular to the axis and forces acting parallel to the axis. The elastic bearing can be configured, for example, to absorb sideways pressure peaks. For example, the elastic bearing can absorb forces acting via the ball joint on a side of the receiving device remote from the receiving element. The elastic bearing can be designed in particular to absorb and dampen vibrations, wherein the vibrations can act on the elastic bearing via the receiving element and / or from the environment. The elastic bearing can be designed in particular to absorb pressure peaks perpendicular to the axis.

[0074] The receiving device can, for example, have a shaft. The shaft can be configured to transmit torque from the drive unit to the receiving device, in particular to the body. The shaft can, for example, be guided through a hole in the elastic bearing. The shaft can project from the end of the receiving device opposite the receiving element into the receiving device, for example to the first rigid element or to the elastic bearing or to the second rigid element or to the joint or to the receiving element. The shaft can, for example, be driven by the drive unit. The drive unit can, for example, drive the shaft at up to 1000 rpm. The elastic bearing can, for example, be configured to dampen an imbalance of the receiving device, in particular an imbalance of the shaft. The elastic bearing can, for example, be configured to convert kinetic energy into thermal energy, for example by means of friction effects.

[0075] The elastic mount can be configured, in particular, to dampen vibrations, in particular elastic vibrations, in particular by converting kinetic energy into thermal energy, for example, by means of friction effects. The elastic mount can be configured, in particular, to prevent the receiving device from being set into resonant vibrations, in particular by damping absorbed vibrations, for example, by converting kinetic energy into thermal energy. Alternatively or additionally, the elastic mount can be configured to define natural frequencies of the receiving device such that they cannot be excited by vibrations typically occurring when the receiving device is used, for example, by engine vibrations and / or ambient noise.The elastic bearing can in particular be designed to dampen the suspension device on another element, for example by converting kinetic energy, for example emanating from a motor of a polishing machine, into thermal energy. The elastic bearing can, for example, provide a resilient suspension. The elastic bearing can in particular be a barrier for vibrations, for example transverse vibrations and / or longitudinal vibrations, for example by converting kinetic energy, for example emanating from a motor of a polishing machine, into thermal energy. The elastic bearing can, for example, be designed to be anisotropic with regard to vibration absorption. For example, cavities in a foam can be non-spherical and arranged in a directed manner on the middle, which can, for example, result in different friction effects in different directions.For example, the elastic bearing may have a low compression modulus, as described above, and may therefore be suitable, for example, for absorbing longitudinal vibrations. Furthermore, the elastic bearing may have a low elastic modulus, and may therefore be suitable, for example, for absorbing transverse vibrations.

[0076] The elastic bearing can comprise at least one element selected from the group consisting of foam, rubber, elastomer, and a spring element. For example, the foam can comprise closed-cell polyetherurethane. The elastic bearing can be, for example, a foam mat, preferably a closed-pore, i.e., closed-cell, foam mat.

[0077] For example, the body can be a polishing tool, wherein the polishing tool can have an elastic layer. The elastic bearing can in particular be made of a different foam than the elastic layer. The elastic bearing can in particular have a stiffer foam than the elastic layer. The elastic layer of the polishing tool can consist of open-pore foam, in particular to absorb liquid, e.g. polishing paste, e.g. to ensure that there is always sufficient polishing paste on the optical surface during the polishing process. The use of closed-cell foam for the elastic bearing can in particular serve to prevent wear and / or ensure the longevity of the elastic bearing. The elastic bearing can preferably be permanently fixed to the holding device.In one embodiment, the elastic bearing cannot be separated from the rest of the receiving device without causing destruction of the elastic bearing or another element of the receiving device. For example, the elastic bearing can be a rubber mat. Alternatively, the elastic bearing can be an elastomer damper. The spring element can, for example, be selected from the group comprising a coil spring, a disc spring, and a gas spring. The elastic bearing can, for example, be constructed from several of the aforementioned materials, for example, as a layered structure.

[0078] The elastic bearing can be glued to at least one further element of the receiving device, preferably by means of an adhesive film. The elastic bearing can be glued, for example, to the first rigid element and / or to the second rigid element, in particular by means of the adhesive film. The adhesive film can be, for example, a PSA (pressure-sensitive adhesive) film. The elastic bearing can be glued to the further element of the receiving device, for example, by a connection between foam and steel. For example, only the top side or only the bottom side of the elastic bearing can be glued to a further element. Preferably, both the top side and the bottom side of the elastic bearing can be glued to a further element. Particularly preferably, the top side of the elastic bearing can be glued to the first rigid element and the bottom side of the elastic bearing can be glued to the second rigid element.

[0079] The elastic bearing can, for example, be designed as a plate or a bushing. For example, the top side of the elastic bearing can be aligned parallel to the bottom side of the elastic bearing when the elastic bearing is relaxed. The plate can, for example, have a hole. The hole can, for example, be designed to guide a shaft, in particular for torque transmission, through the plate. Alternatively or additionally, torque transmission can be enabled by the elastic bearing. The elastic bearing can, for example, be circular or annular, in particular with regard to a cross-section perpendicular to the axis. For example, the elastic bearing can be designed to be rotationally symmetrical, in particular about the hole. For example, the cross-section perpendicular to the axis of the elastic bearing can have the shape of a circular section or a ring section. The elastic bearing can, for example,have a thickness of at least 4 mm, in particular at least 20 mm, parallel to the axis. The elastic bearing can be, for example, a rubber bearing. In particular, the elastic bearing can be a cardanic rubber bushing.

[0080] The elastic bearing can, for example, have a modulus of elasticity from the group of 0.5 N / mm 2< to 25 N / mm 2< , from 1.0 N / mm 2< to 2 N / mm 2< , and from 1.5 N / mm 2< to 2 N / mm 2<. For example, the elastic bearing can have several zones with different moduli of elasticity. For example, the elastic bearing can have two layers with different moduli of elasticity. The modulus of elasticity of the elastic bearing can, in particular, be selected such that optimal damping of vibrations, in particular damping of resonant vibrations, can be achieved. Furthermore, the modulus of elasticity can be selected such that torque transmission via the elastic bearing can be ensured, in particular in cases where torque is transmitted exclusively via the elastic bearing, for example without a shaft or torque transmission through the bellows.

[0081] The holding device can, for example, be a workpiece holder. The holding element can be designed for the reversible holding of a workpiece, in particular for the reversible holding of a spectacle lens. The workpiece holder can, for example, be drivable, non-drivable or passively drivable. The body can, for example, be a spectacle lens. The holding element can, for example, be configured to reversibly fix the spectacle lens or a lens to the holding device, in particular for the duration of the polishing process. For example, the holding element can have a lens holder or a mirror holder. The holding element can, for example, be designed to fix the lens, in particular the spectacle lens, by means of at least one screw. The holding device can, for example, be designed as a workpiece spindle. The proposed polishing machine can, for example,on the tool spindle or on the workpiece spindle, wherein the elastic bearing can be a force-fitting structural element that has an elastic and damping effect against pressure peaks acting in the horizontal plane. It can be advantageous to mount the upper part of the tool holder on the elastic bearing in the form of a horizontally arranged plate made of a suitable foam material on the tool spindle. The elastic bearing can be designed to compensate for sideways directed pressure peaks, in particular high-frequency pressure peaks and / or pressure peaks acting in the axial direction, by means of a corresponding tilting movement. Alternatively, a damping effect can be achieved by means of an elastic bushing. In both cases, in addition to foam mats, other structural elements and materials with elastic properties can also be conceivable as elastic bearings. The elastic bearing can, for example,be designed as a compensating and damping element.

[0082] The holding device can, for example, be a non-driven polishing tool holder. Alternatively or additionally, the holding device can be a passively driven holding device, in particular by an opposing element, for example, an opposing driven holding device.

[0083] For example, the holding device can comprise the following elements: a driven side of the tool spindle, the elastic bearing, e.g., designed as an elastic element to compensate for lateral pressure peaks, a ball joint bearing with a bellows for torque transmission, a polishing tool base body, and a polishing tool foam. These elements can be arranged, for example, in the order mentioned. The holding device can be designed, in particular, to hold spectacle lenses made of plastic materials.

[0084] The proposed polishing machine may comprise a holding device as described above. The polishing machine may be configured, in particular, for polishing free-form ophthalmic lenses. For example, the polishing machine may comprise two or more of the proposed holding devices.

[0085] The elastic bearing can in particular be designed to elastically couple the two receiving devices to one another.

[0086] For example, at least one of the two mounting devices can be reversibly connected to a machine frame. For example, the at least one mounting device can be mechanically coupled to the machine frame in an inelastic manner or can be coupled.

[0087] For example, the polishing machine can have a holding device as a workpiece holder and / or a holding device as a polishing tool holder. The polishing machine can also only have a holding device as a tool holder. For example, the polishing machine can comprise the body(ies), in particular the polishing tool. For example, the polishing machine can have a workbench or a CNC machine. For example, the polishing machine can have two oppositely arranged or opposing holding devices, wherein the axes of the holding devices are offset or displaceable relative to one another. The axes of the holding devices can be arranged parallel to one another. The polishing machine can, for example,be designed to guide a rotating tool, in particular the polishing tool, subjected to a defined pressure over a likewise rotating glass surface, for example, the spectacle lens, optionally with the aid of a polishing suspension. The polishing machine can in particular be designed to generate a defined relative movement between the optical surface and the tool, e.g., the polishing tool.

[0088] The polishing machine may, for example, have a control device. The control device may be configured to at least partially carry out the proposed polishing method.

[0089] One of the two rigid elements can be at least part of the arm of the polishing machine. Preferably, both rigid elements can be parts of the arm of the polishing machine.

[0090] Preferably, the elastic bearing can be irreversibly connected to the two rigid elements. For example, the elastic bearing can be irreversibly connected to the arm of the polishing machine.

[0091] The elastic bearing can be configured to elastically support at least one of the two receiving devices relative to the arm. The arm can, for example, be rigidly connected to a machine frame.

[0092] For example, the polishing machine can be designed such that at least one of the two receiving devices is reversibly connected to a remaining part of the polishing machine.

[0093] For example, at least one of the two rigid elements can be configured to realize a reversible connection to a machine bed and / or a machine frame.

[0094] The inventors have recognized that, in contrast to, for example, shaping processes, particularly milling, turning, or grinding processes, precise guidance from the tool to the workpiece is not required to the same extent in the process for polishing optical surfaces of ophthalmic lenses. In particular, the inventors have recognized that a tolerance range for a path deviation in processes for polishing optical surfaces of ophthalmic lenses can be approximately 1 mm, thus being up to a factor of 1000 larger than in shaping processes.

[0095] Preferably, the elastic bearing can be designed independently of a machine bed and / or a machine frame. In particular, the two rigid elements can not be part of the machine frame and / or the machine bed. For example, the two rigid elements and / or at least one of the two receiving devices can be or can be connected only reversibly to the machine bed or the machine frame. In addition to the above-mentioned steps, the polishing method can comprise one or more further steps, for example applying polishing paste or water to the polishing machine, in particular to the polishing tool. In the polishing method, for a glass surface, in particular for organic glass materials, material removal can be approximately 8 µm to 10 µm. For mineral materials, material removal can be 15 µm to 20 µm.The machine can be configured such that the amplitude of an elastic movement permitted by the elastic bearing is greater than the amount of material removed during the polishing process. In particular, the machine can be configured such that the amplitude of the elastic movement permitted by the elastic bearing in the lateral direction is greater than the amount of material removed in the vertical direction, in particular greater than the amount of maximum material removed during the polishing process of a spectacle lens.

[0096] The material removal of each surface element during the polishing process can depend on various locally effective physical factors. The determining factors here can be the relative speed between the glass and the polishing tool, the local processing pressure, and the local surface curvature. The material properties of the glass, the polishing tool, and the polishing suspension can be considered constant within the process. Material removal can correspond to the integral of a local removal rate over the polishing time, whereby this can be proportional to the product of the local relative speeds and the local processing pressure according to the so-called Preston equation. A proportionality factor is summarized in the Preston constant.The local relative speeds can be approximately determined using model calculations and can be largely controlled to constant values ​​via the variable glass and tool speeds and oscillation movements, for example, using the control device. A set processing pressure, on the other hand, can act globally on a flat polishing tool, for example.

[0097] The polishing of the optical surface can in particular be carried out in such a way that an evasive movement between the two holding devices can be carried out by means of the elastic bearing. The proposed solution can have numerous advantages. For example, greater precision and surface quality can be achieved when polishing optical surfaces by means of the holding device and / or the polishing machine and / or the polishing process. Furthermore, a damping effect can be achieved. For example, the excitation of resonance frequencies can be prevented. This can, for example, lead to a reduction in noise. Furthermore, a reduced service life of at least one element of the polishing machine resulting from resonant vibrations can be prevented. Furthermore, noise emissions can be optimized, in particular reduced.

[0098] Embodiments of the disclosure are illustrated in the drawings and explained in the following description. They show: Fig. 1 shows part of an embodiment of a polishing machine, in particular an embodiment of a holding device; Fig. 2 shows another embodiment of a polishing machine; Fig. 3 shows another embodiment of a polishing machine with two embodiments of holding devices; and Fig. 4 shows a flowchart of a method for polishing an optical surface of a spectacle lens.

[0099] Fig. 1 shows part of an embodiment of a polishing machine 36. The polishing machine 36 has two receiving devices 10 and an elastic bearing 14. Each of the two receiving devices 10 has a receiving element 12 for reversibly receiving a body 42. The elastic bearing 14 is arranged between the two receiving devices 10.

[0100] The Fig. 1 The embodiment shown of a receiving device 10 for an embodiment of a polishing machine 36 for processing optical surfaces of spectacle lenses has, in particular at one end, a receiving element 12 for reversibly receiving a body 42. The body 42 can in particular be designed as a polishing tool 44. The polishing tool 44 can, for example, have an elastic layer 46. The polishing tool 44 can furthermore have a polishing plate 48. The elastic layer 46 can in particular be designed to achieve an adaptation of the polishing plate 48 to the optical surface of the spectacle lens during the process. The polishing plate 48 is preferably designed such that the surface of the polishing tool 44 can adapt to the optical surface 62 of the spectacle lens.

[0101] The receiving device 10 has an elastic bearing 14. The elastic bearing 14 can, for example, comprise foam 26, in particular an elastic foam layer, which can be circular or ring-shaped. The elastic foam layer can preferably be closed-cell. The top and / or bottom sides of the foam layer can, for example, be glued.

[0102] The elastic bearing 14 is arranged between two rigid elements 38 and 40. The elastic bearing 14 can, in particular, be glued to a first rigid element 38 on its upper side, and a bottom side of the elastic bearing 14 can be glued to a second rigid element 40. For example, the receiving device 10 can be configured as a polishing tool holder 34.

[0103] The elastic bearing 14 can be arranged on the side opposite the receiving element 12.

[0104] The receiving device 10 can have a joint 16. The joint 16 can have a ball pin 50 and a ball socket 52. The joint 16 can be arranged between the receiving element 12 and the elastic bearing 14. The receiving device 10 can have a bellows 18. The bellows 18 can be arranged between the receiving element 12 and the elastic bearing 14. The bellows 18 can, in particular, be a rubber bellows. The bellows 18 can be designed to transmit torque.

[0105] The Fig. 1 The receiving device 10 shown can, in particular, be an elastically mounted tool holder for polishing free-form surfaces. The receiving element 12 can, for example, be a holder for a polishing tool 44. The receiving device 10 can, for example, have a lower part 54 of a tool holder. For example, the first rigid element 38 can be the lower part 54 of the tool holder.

[0106] The elastic bearing 14 can preferably be closed-cell. The receiving device 10 can have an axis 24. The axis 24 can in particular be a rotational axis. The elastic bearing 14 can be designed to absorb forces perpendicular to the axis 24. The receiving device 10 can, for example, have a spindle 22, in particular a driven tool spindle 56. Alternatively, the receiving device 10 can be configured to be connected to a driven tool spindle 56. For example, the tool spindle 56 can be fastened to the receiving device 10 by means of a clamping device 58. The clamping device 58 can in particular also be designed to fasten the entire tool carrier. The top side of the elastic bearing 14 and / or the bottom side of the elastic bearing 14 can be glued to the first rigid element 38 and / or to the second rigid element 40, for example by means of a PSA adhesive film 60.The upper side of the elastic bearing 14 can, in particular, point in the direction of the receiving element 12. The underside can, in particular, point away from the receiving element 12.

[0107] The receiving device 10 can, for example, have a shaft 32. The elastic bearing 14 can be configured to dampen vibrations. In general, the elastic bearing 14 can be adhesively bonded to at least one further element of the receiving device 10, preferably by means of an adhesive film 28. The elastic bearing 14 can preferably be designed as a plate 30. The elastic bearing 14 can have a modulus of elasticity of 0.5 N / mm 2 to 25 N / mm 2 , in particular of 1.0 N / mm 2 to 2 N / mm 2 , in particular of 1.5 N / mm 2 to 2 N / mm 2 .

[0108] Fig. 2 shows a further embodiment of a polishing machine 36. The polishing machine 36 can be or comprise a horseshoe-shaped or a U-shaped device.

[0109] The elastic bearing 14 can be configured to couple the two holding devices 10 to one another, in particular in a vibration-damping and / or elastic manner. One holding element 12 of the polishing machine 36 can be a polishing tool holder 34. Another holding element 86 of the polishing machine can be designed to reversibly hold a spectacle lens. The further holding element 68 can be, for example, a workpiece holder 64.

[0110] The Fig. 2 The embodiment shown of a polishing machine 36 for processing optical surfaces of spectacle lenses has, in particular at one end, a receiving element 12 for reversibly receiving a body 42. The body 42 can in particular be designed as a polishing tool 44.

[0111] The polishing tool 44 can, for example, have an elastic layer 46. The polishing tool 44 can further have a polishing plate 48. The elastic layer 46 can be designed, in particular, to achieve an adaptation of the polishing plate 48 to the spectacle lens during the process. The polishing plate 48 is preferably designed such that the surface of the polishing tool 44 can adapt to the optical surface 62 of the spectacle lens.

[0112] The polishing machine 36 has an elastic bearing 14. The elastic bearing 14 can, for example, comprise foam 26, in particular an elastic foam layer, which can be circular or ring-shaped. The elastic foam layer can preferably be closed-cell. The top and / or bottom of the foam layer can, for example, be glued, for example, using an adhesive film 28.

[0113] The elastic bearing 14 is arranged between two rigid elements 38 and 40, which may, for example, be part of an arm of the polishing machine 36. The elastic bearing 14 may, in particular, be bonded to a first rigid element 38 at its top, and a bottom of the elastic bearing 14 may be bonded to a second rigid element 40. For example, the polishing machine 36 may include a polishing tool holder 34 and a workpiece holder 68.

[0114] At least one of the two receiving devices 10 can have a joint 16. The joint 16 can have a ball pin and a ball socket. The joint 16 can be arranged between the receiving element 12 and a shaft 32. At least one of the two receiving devices 10 can have a bellows 18. The bellows 18 can, in particular, be a rubber bellows. The bellows 18 can be designed to transmit torque.

[0115] One of the Fig. 2 The mounting devices 10 shown can, in particular, be an elastically mounted tool holder for polishing free-form surfaces. The mounting element 12 can, for example, be a holder for a polishing tool 44.

[0116] The elastic bearing 14 can preferably be closed-cell. At least one of the two receiving devices 10, preferably both receiving devices 10, can have an axis 24. The axis 24 can in particular be an axis of rotation. The elastic bearing 14 can be designed to absorb forces perpendicular to the axis 24. The receiving device 10 can, for example, have a spindle, in particular a driven tool spindle. Alternatively, the receiving device 10 can be set up to be connected to a driven tool spindle. For example, the tool spindle can be fastened to the receiving device 10 by means of a clamping device. The clamping device can in particular also be designed to fasten the entire tool carrier. The top side of the elastic bearing 14 and / or the bottom side of the elastic bearing 14 can, for example,be bonded to the first rigid element 38 and / or to the second rigid element 40 by means of a PSA adhesive film 60. The upper side of the elastic bearing 14 can, in particular, point in the direction of the receiving element 12. The underside can, in particular, point away from the receiving element 12. For example, the underside can point toward the further receiving element 68, in particular along the horseshoe-shaped device.

[0117] The receiving device 10 can, for example, have a shaft 32. The elastic bearing 14 can be configured to dampen vibrations. In general, the elastic bearing 14 can be adhesively bonded to at least one further element of the receiving device 10, preferably by means of an adhesive film 28. The elastic bearing 14 can preferably be designed as a plate 30. The elastic bearing 14 can have a modulus of elasticity of 0.5 N / mm 2 to 25 N / mm 2 , in particular of 1.0 N / mm 2 to 2 N / mm 2 , in particular of 1.5 N / mm 2 to 2 N / mm 2 . Fig. 3 shows a further embodiment of a polishing machine 36 for processing an optical surface of a spectacle lens 62. The optical surface 62 can be, for example, a front and / or back surface of a spectacle lens, in particular a free-form spectacle lens. The polishing machine 36 can have a holding device 10, as described above. Fig. 3 The polishing machine 36 shown shows how the polishing machine 36 in Fig. 2 , two embodiments of the receiving devices 10. For example, the polishing machine 36 can have a receiving device 10 as a polishing tool holder 34, in particular a receiving device 10 as already shown in Fig. 1 shown and described above. Alternatively or additionally, the polishing machine 36 may comprise a receiving device 10 as shown in Fig. 2 shown.

[0118] Alternatively or additionally, the polishing machine 36 can have a receiving device 10 as a workpiece holder 64. The receiving device 10 as a polishing tool holder 34 can receive the polishing tool 44 as a body 42. The receiving device 10 as a workpiece holder 64 can receive the spectacle lens with the optical surface or the lens 62 as a body 42.

[0119] The polishing machine 36 can, for example, have further holding devices 10, for example a total of four holding devices 10, in order to polish, for example, two spectacle lenses in parallel.

[0120] Both holding devices 10 can, for example, be arranged opposite one another. Axes 24 of the two holding devices 10 can, for example, be arranged parallel but offset from one another. For example, the axes 24 can be displaceable. The polishing machine 36 can, for example, have a control device 66. The control device 66 can, for example, be designed to regulate a rotational speed and / or a pressure application.

[0121] For example, the polishing machine can have at least one clamping device 58, for example for the reversible fastening of a receiving device 10. Preferably, the polishing machine can have two clamping devices 58 for the reversible fastening of two receiving devices 10. Fig. 4 shows a flowchart of a method 100 for polishing an optical surface 62 of a spectacle lens. In a preceding step S101, for example, a polishing machine 36 can be provided, as described above. The polishing machine 36 can have two receiving devices 10 and an elastic bearing 14. Each of the two receiving devices 10 can have a receiving element 12. The elastic bearing 14 can be arranged between the two receiving devices 10.

[0122] In a first step S102, a first and a second body 42, such as a spectacle lens with a surface 62 to be polished and a polishing tool 44, are received by means of two elastically connected receiving devices 10. The first body can have or be the spectacle lens 62. The second body can have or be a polishing tool 44. In a step S103, the optical surface 62 of the spectacle lens is polished with the polishing tool 44 or with the polishing machine 36. Furthermore, the control device 66 can be used in the method to regulate the polishing process, for example to regulate a rotational frequency or a pressure application or a relative movement of the two receiving elements 12 or an application of polishing paste or water.

[0123] In summary, the advantages of the solutions proposed herein, particularly thanks to the improved damping during polishing, can be to further improve the surface quality of a spectacle lens and to enable more uniform material removal, particularly during polishing.

Claims

1. Polishing machine (36) for processing an optical surface (62) of a spectacle lens, wherein the polishing machine (36) has two receptacle devices (10) and an elastic bearing (14), wherein each of the two receptacle devices (10) has a receptacle element (12) for the reversible accommodation of a body (42), wherein the elastic bearing (14) is arranged between the two receptacle devices (10), characterized in that at least one of the two receptacle devices (10) has an axis (24), wherein the elastic bearing (14) is designed to absorb forces perpendicular to the axis (24), wherein the axis (24) is an axis of rotation for a rotational polishing movement of one of the receptacle elements (12), wherein the elastic bearing (14) enables a relative movement between the two receptacle devices (10) of 250 µm to 1 cm perpendicular to the axis (24).

2. Polishing machine according to the preceding claim, characterized in that the elastic bearing (14) is arranged between two rigid elements (38, 40).

3. Polishing machine according to any one of the preceding claims, wherein the elastic bearing (14) enables a relative movement between the two receptacle devices (10) of 500 µm to 4 mm.

4. Polishing machine according to any one of the preceding claims, characterized in that one of the two receptacle devices (10) is designed for the reversible accommodation of a polishing tool (44) and the other of the two receptacle devices (10) is designed for the reversible accommodation of a spectacle lens.

5. Polishing machine according to any one of the preceding claims, characterized in that the elastic bearing (14) has at least one element selected from the group of foam (26), rubber, elastomer, and a spring element.

6. Polishing machine according to any one of the preceding claims, characterized in that the elastic bearing (14) is closed-cell.

7. Polishing machine according to any one of the preceding claims, characterized in that the elastic bearing (14) has a modulus of elasticity from the group of 0.5 N / mm2 to 25 N / mm2, of 1.0 N / mm2 to 2 N / mm2, and of 1.5 N / mm2 to 2 N / mm2.

8. Method (100) for polishing processing of an optical surface of a spectacle lens (62), comprising the following steps: - reversibly accommodating (S102) a first and a second body (42) by means of two elastically connected receptacle devices (10), wherein each of the two receptacle devices (10) has a receptacle element (12) for the respective reversible accommodation of the first or second body (42), wherein an elastic bearing (14) is arranged between the two receptacle devices (10), wherein the first body has the spectacle lens (62) and wherein the second body has a polishing tool (44), and - polishing (S103) the optical surface of the spectacle lens (62) using the polishing tool (44); characterized in that at least one of the two receptacle devices (10) has an axis (24), wherein the elastic bearing (14) is designed to absorb forces perpendicular to the axis (24), wherein the axis (24) is an axis of rotation for a rotational polishing movement of one of the receptacle elements (12), wherein the elastic bearing (14) enables a relative movement between the two receptacle devices (10) of 250 µm to 1 cm perpendicular to the axis (24).

9. Method for producing a spectacle lens having an optical surface (62), characterized in that polishing processing of the optical surface (62) of the spectacle lens is carried out using a method according to Claim 8.