EP3126091A1

EP3126091A1 - Polishing tool as well as device and method for form-defect-optimized polishing of spectacle lens surfaces and casting mould shells for spectacle lens production

Info

Publication number: EP3126091A1
Application number: EP15712885.1A
Authority: EP
Inventors: Wolf Krause; Georg Michels; Gerd Nowak
Original assignee: Carl Zeiss Vision International GmbH
Current assignee: Carl Zeiss Vision International GmbH
Priority date: 2014-04-03
Filing date: 2015-03-26
Publication date: 2017-02-08
Anticipated expiration: 2035-03-26
Also published as: EP3126091B1; WO2015150201A1; HUE038798T2; DE102014206424A1

Abstract

The invention relates to a polishing tool (100) for surfaces of spectacle lenses and casting mould shells for spectacle lenses with a polishing lip (118) which comprises a rigid support (110) and has a polishing face (120), which has at least one uninterruptedly annular toric portion. It is provided according to the invention that an elastic body (114) and a polishing covering (116) are arranged on the rigid support (110). The invention also relates to a method and a device for polishing surfaces of spectacle lenses and to casting mould shells for spectacle lenses with such a tool.

Description

Description:

Polishing tool and device and method for shape-error-optimized polishing processing of spectacle lens surfaces and mold shells for eyeglass lens manufacturing

The invention relates to a polishing tool, in particular a ring-adaptive

Polishing tool according to the preamble of patent claim 1, a method for

Polishing of spectacle lens surfaces and mold shell surfaces, in particular surfaces of spherical, toric and / or progressive spectacle lenses, after

Preamble of claim 7 and a device for polishing machining of

Spectacle lens surfaces and mold shell surfaces, in particular surfaces of spherical, toric and / or progressive spectacle lenses, according to the preamble of

Patent claim 14.

For the mass polishing of spherical, toric and free-form spectacle lenses made of mineral or organic materials polishing tools are used with a spherically shaped polishing body according to the internally known state of the art, which adapts to the machined spectacle lens surface during polishing. So that the surface of the spherical polishing body can adapt to the geometry of the spectacle lens surface which is often very divergent from the spherical shape, an elastic foam material layer is adhered to a solid tool body. On this elastic layer, a polishing foil facing the workpiece is applied as a polishing pad. Such a polishing tool is e.g. in DE 10 2004 003 131 A I, DE 10 2008 062 097 A I or DE 603 12 475 T2. To the adaptability of

To support the polishing pad surface to the eyeglass lens surface, the polishing tools are generally smaller than the workpiece, as shown in Fig. 1 of EP 1 251 997 B2. The polishing removal comes with the aid of an abrasive polishing liquid through the

Relative movement between the pressurized rotating polishing tool and the rotating spectacle lens. Details on this are also taken from EP 1 251 997 B2.

The fundamental disadvantage of this arrangement is that the elastic layer of the spherical polishing tool, the height differences caused by the toric or free-form geometry of the spectacle lens has to compensate for the momentarily covered spectacle lens area completely. These height differences can be common with today, with toric Share equipped progressive lens surfaces may well be in the range of several millimeters. During the polishing process, the pressure distribution on the spectacle lens surface is therefore not constant. Because of the proportionality of locally applied polishing pressure and the resulting removal rate arise in this polishing basically form errors, the size of which depends on the extent of the asphericity of the spectacle lens.

Such a systematic polishing error can be reduced by the fact that the

Tool diameter is chosen smaller with increasing deviation of the spectacle lens surface of the spherical shape. Because of the thereby reduced by the polishing tool covered and machined surface portion of the spectacle lens and also the generally reduced relative speed between the spectacle lens and polishing tool, the efficiency of the polishing process is significantly reduced.

In order to be able to polish aspherical surfaces quickly and uniformly, EP 1 249 307 A2, with an otherwise identical structure, teaches the use of a toroidally shaped polishing body. Toric means barrel-shaped in this text.

From DE 44 12 370 A I, from which the invention proceeds, a method for producing aspherical surfaces of lens blanks, especially glass, is known. This method uses a CNC machine tool having a control unit and a rotatably deliverable pot tool for polishing a workpiece in a fixture that is movable along a feed axis to a machining position, the axes of pot tool and fixture forming an angle to one another. The pot tool is guided on the lens blank along a predetermined by the control unit machining contour such that between the longitudinal axis of the pot tool and the normal in its point of contact on the workpiece a selectable lead angle is maintained constant. As a result, the pot tool remains the same from the polishing point insert, during the entire machining with respect to the processing point on the workpiece aligned so that changing aspheres or ball radii are processed contoured in changing series. This is done with a constant same polishing diameter, so that the wear on the pot tool is minimized perpendicular to the contact surface. In addition, the pot tool comes because of the

Lead angle always only inclined to rest on the workpiece, so that a point contact at best - after a long service life - to a very small segment or curved surface increased. Depending on the diameter of the ring torus polishing lip of the pot tool, which is referred to in this document as a peripheral part, the inclination of the

Pot tool and the lead angle for the respective polishing task to be optimally adjusted. Preferably, the lead angle is 0 °, from the starting position at the beginning of processing. The Vorschubbewegbarkeit the workpiece spindle allowed according to the statement in this published patent application DE 44 12 370 AI a free-form surface treatment.

According to the teaching of DE 44 12 370 A I it is provided to acquire samples of its surface during the machining of the workpiece and to take them into account in the subsequent processing by changing the web guide of the pot tool in the control unit.

The object of the invention is the generic polishing tool, the

generic device and the generic method for polishing processing in such a way that free-form surfaces can be polished with high dimensional accuracy and high efficiency.

This object is achieved by a, in particular annular-adaptive polishing tool with the features of claim 1, a method for polishing of

Eyeglass lens surfaces Casting lenses for eyeglass lens manufacturing with the features of claim 7 and by a device for polishing machining of

Eyeglass lens surfaces mold shells for eyeglass lens manufacturing with the features of claim 14 solved. Advantageous embodiments and developments of the invention are specified in the subclaims.

The polishing tool according to the invention for surfaces of spectacle lenses or casting shells for spectacle lenses comprises a polishing lip with a rigid support, an elastic body arranged on the rigid support and a polishing covering arranged on the elastic body. The surface of the polishing pad provides a polishing surface. This polishing surface has at least one closed annular portion. Under closed

Ring Toric section is understood to mean an annular (circumferential) segment of the shell of a ring torus, that is to say an annular partial surface of a ring torus surface.

Such a polishing tool according to the invention may be similar to the pot polishing tool according to DE 44 12 370 AI formed and a polishing lip in the form of a Ringtorushalbschale to have. However, the polishing lip of the polishing tool according to the invention additionally comprises, in addition to the rigid body functioning as a carrier according to the invention, an elastic body arranged on the carrier and one arranged on the elastic body

Polishing lining.

The elasticity of the elastic body allows an adaptation of the polishing surface to the surface contour of the surface to be polished and thus a flat polishing removal, which according to the teaching of DE 44 12 370 A I just not desired. The DE 44 12 370 A I rather requires a punctual polishing removal. The surface contact of polishing surface and

Workpiece instead of a punctual contact allows free-form surfaces with high

Shaping shape and high efficiency. The stated object is therefore fully solved by the invention.

The closed annular portion of the polishing surface has a ring torus radius (main radius) and a lip radius (minor radius). It has proven to be beneficial

to select the aspect ratio between 2 and 250 formed from the quotient of the radius of the ring radius and the lip radius. In such a chosen

Aspect ratio can on the one hand with the polishing tool a wide range

Free-form surfaces are polished and on the other hand, the demand for a homogeneous

Pressure distribution within the contact surface polishing / eyeglass lens surface or polishing / Gießformschalenoberfläche be achieved.

The majority of common spectacle lens or Gießformschalenoberflächengeometrien can be processed with polishing tools whose polishing surface has a closed ringtori see section whose aspect ratio is selected between 2.5 and 40. The number of tools required to polish the entire range of eyeglass lenses can be reduced. Most preferably, the aspect ratio has a value between 3 and 8. If one selects the aspect ratio for the ring-or toric section of the polishing surface in this range of values, one may possibly completely dispense with different tools for processing different workpiece surface geometries.

Geometry considerations and experience show that particularly good polishing properties are achieved when the annular torus forming the annular polishing surface has a minor radius between 2 and 50 mm, most preferably between 5 and 20 mm. Under these conditions, a particularly good adaptation of the polishing tool to the usual spectacle lens mold shell surface geometries can be achieved.

Experience has shown that particularly good polishing results can be achieved if the annular torus forming the ring-oring polishing surface has a main radius between 20 and 200 mm, most preferably between 30 and 80 mm. With such tool geometries, a broad spectrum of spectacle lens shell shapes can be efficiently polished with a high removal rate.

In a particularly advantageous embodiment, the rigid support of the

Polishing tool on a preferably complementary to the polishing surface formed closed annular outer contour portion on which the elastic body is arranged and the elastic body has a constant thickness. This ensures that the elasticity of the elastic body, assuming a homogeneous material, is largely the same over the entire polishing surface. If the rigid support has a ring-shaped outer contour, on which the elastic body is arranged, and the elastic body has a constant thickness, a configuration of the polishing tool is obtained, which extends largely through

Edge region of the contact surface towards gently decreasing polishing force distribution. This edge-degressive butt-to-edge force avoids unwanted, rugged ones

Pressure gradients caused polishing structures.

Alternatively, the rigid support may have a hollow cylindrical portion with a flat end face on which the elastic body is disposed, the elastic body having a closed annular outer contour portion. This alternative variant of a polishing tool is characterized in that such tools are easy to produce.

It has turned out to be favorable if, in contrast to the geometry of the polishing surface described in DE 44 12 370 A I, the closed ring-or toric section of FIG

Polishing surface as radially outwardly directed annular half-shell surface or as a radially inwardly directed ring-shaped half-shell surface forms or when the closed ring-toric section has a radially outwardly directed Ringtorische half-shell surface or a radially inwardly directed Ringtorische half-shell surface as a partial surface. This allows improved polishing results. Improvements can already be achieved if one does not align the ring-shaped half-shell surface in the axial direction or if the polishing surface has a ring-shaped half-shell surface, which is not aligned in the axial direction.

The elastic body is generally made of a material whose modulus of elasticity is greater than 0.02 N / mm ² . Suitable materials are thus elastomers, such as rubber or rubber, in particular polyurethane, polyetherurethane or the like. This elastic body may for example be an injection molded part.

As a polishing pad, a commercially available polyurethane-based polishing film can be used. Instead of a polishing foil and an abrasive coating can be applied to the elastic body.

The method according to the invention for polishing a spectacle lens surface or a casting shell surface (which regularly has a shape that is complementary to the spectacle lens surface) with a polishing tool having a rigid body

Polishing lip with a polishing surface having at least one closed ring or toric section is characterized in that a polishing tool is used whose rigid body acts as a carrier of an elastic body and a polishing pad.

The elasticity of the elastic body allows an adaptation of the polishing surface to the surface contour of the surface to be polished and thus a flat polishing removal. The surface contact of the polishing surface and workpiece instead of a proposed in DE 44 12 370 A I point contact allows free-form surfaces to be polished with high dimensional accuracy and high efficiency. The stated object is therefore fully solved by the invention.

The annular-adaptive trained polishing tool is preferably such over the

Eyeglass lens or shell surface is moved or moved relative to this that is deformed by a compressive stress of the elastic body of the polishing tool on the eyeglass lens or shell surface. The currently polished area on the

Eyeglass lens or shell surface, the so-called contact surface is then not circular as in the method described in EP 1 251 997 B2 and also not punctiform as in the method described in DE 44 12 370 AI, but preferably strip to kidney-shaped.

In a variant of the invention, the geometry of the polishing surface and the geometry of the spectacle lens surface or the casting shell surface for the momentary

Relative movement of the polishing surface to the lens surface or the

Mold shell surface considered. In other words, the geometry of the polishing surface and the geometry of the spectacle lens surface or of the casting shell surface are incorporated in the actually performed relative movement between the polishing surface and the workpiece surface. In other words, the contact surface, ie the partial surface of the polishing surface which is brought into contact with the workpiece surface, is interposed in dependence on the geometry of the polishing surface and the geometry of the spectacle lens surface or the casting shell surface by corresponding relative alignment between the polishing tool and the workpiece and corresponding feed movement direction Polishing tool and workpiece controlled. Again, the invention differs from the teaching of DE 44 12 370 A I, which requires a constancy of the lead angle.

It is favorable if the geometry of the polishing surface and / or the geometry of the spectacle lens or the casting shell surface is provided in the form of a mathematical description. In this way, a desired alignment and feed movement direction between the polishing tool and the workpiece can be calculated in advance and adjusted with the aid of a control device.

A particularly preferred approach is based on the idea that in the

Spectacle lens manufacturing usual freeform surfaces can be divided into a sequence of segments, which can be approximated in detail with minimally deformed rings of different radii. This realization would be a variety of annular

Suggest polishing tools with different radii. According to the invention replaces a single, during the polishing process continuously adjustable in inclination

Polishing tool this variety of polishing tools.

The geometry of the spectacle lens surface or mold shell surface may be approximated, for example, by at least one toric surface segment or corresponding to the above idea by a series of such segments. The polishing tool and the polishing movement should be selected so that during the

Polishing process, the currently polished surface portion on the spectacle lens surface is not circular as in the method described in EP 1 251 997 B2 and also not punctiform as in the method described in DE 44 12 370 AI, but approximately strip or kidney-shaped.

During the polishing process, the generally rotationally supplied annular-adaptive polishing tool with its pressed against the spectacle lens polishing lip deviating from the teaching of DE 44 12 370 AI arcuately along the flat radius of the torus approximation of the spectacle lens surface ("rotation radius") out, this ideal tool track line In the case of progressive lenses with or without a toric component, the shape may also differ greatly from the circular arc.

The described polishing can be done in a single overflow in the feed direction or in several individual overflows, which can also be arranged side by side parallel or approximately parallel to the feed direction. The method variant may be advantageous in the case of spectacle lens surfaces, which are characterized by very great variance of the surface curvatures.

It is recommendable that the polishing tool is moved relative to the spectacle lens or the mold shell touching the spectacle lens surface or the mold shell surface with the polishing lip on a contact surface and if an inclination of the polishing tool against the spectacle lens surface or Gießformschalenoberfläche while minimizing the differences in the deformation of the elastic body within the contact surface is adjusted. In other words, it is advantageous if the elastic body in the area of

Touch surface is compressed as evenly as possible. If the shape of the polishing surface and the shape of the workpiece surface to be polished are known, it is always possible to find surface portions which are approximately complementary to one another and which can be brought into abutment with one another by suitable positioning and guidance.

A particularly even polishing of the lens surface! yourself, if that

Polishing tool is adjusted so that the respective average radius of the currently covered Surface segment is continuously approximated best fitting. By targeted deviation from the best-fitting angle of attack, the pressure distribution can be controlled. In addition, the polishing pressure for each currently covered area segment of the spectacle lens or the mold shell can be continuously determined by the delivery of spectacle lens surface /

Mold shell surface and tool controlled.

The calculation of the relative movement between polishing tool and workpiece and their control is preferably carried out computer-aided. The invention therefore sees the

Provision of a corresponding computer program with program code for performing all method steps according to one or more of the above-described

Embodiments of a method according to the invention before when the computer program is loaded in a computer and / or running in a computer.

A device according to the invention suitable for carrying out the above method for polishing a spectacle lens surface or a

Mold shell surface requires a polishing tool having a polishing lip comprising a rigid support with a polishing surface having at least one closed annular portion, wherein on the rigid support an elastic body and a polishing pad are arranged.

The apparatus may include a guide means for deforming the elastic body over the spectacle lens surface or the polishing tool

Lead mold shell surface. It depends solely on the relative movement between the polishing tool and the workpiece surface, i. The term guiding comprises both a sole movement of the tool or the workpiece or a movement of the tool and the workpiece.

The apparatus may include a guide means which moves the polishing tool and the bristle face or the mold shell surface relative to each other such that the polishing surface rests on the spectacle lens surface or the mold shell surface in stripes or kidney shape. The devices shown below in FIGS. 8 to 13 have such a guide device. The guiding device can be designed such that it determines the geometry of the polishing surface and the geometry of the spectacle lens surface or of the casting shell surface for the momentary relative movement of the polishing surface to the spectacle lens surface or the

Mold shell surface considered. It may be for this purpose e.g. an electronic computer can be present, which calculates the required relative movement between tool and workpiece on the basis of the geometry data.

The guide means may comprise a providing means e.g. in the form of an electronic memory and / or an electronic computer, which provides the geometry of the polishing surface and / or the geometry of the spectacle lens surface or Gießformschalenoberfläche in the form of a mathematical description.

The provision device can be designed such that the geometry of the

Spectacle lens surface or Gießformschalenoberfläche is approximated by at least one toric surface segment.

The guide device may be configured to guide the polishing tool touching the spectacle lens surface or the casting shell surface with the polishing lip on a contact surface over the spectacle lens surface or the casting shell surface and thereby the inclination of the polishing tool relative to the spectacle lens surface or the

To adjust mold shell surface while minimizing the differences in the deformation of the elastic body within the contact surface.

The invention will be described in more detail with reference to the drawing. The same or functionally identical components are provided in the figures with the same reference numerals. Show it:

Figure 1 shows a first embodiment of an inventive annular adaptive

Polishing tool in longitudinal section

Figure 2 shows a second embodiment of an inventive annular adaptive

Polishing tool in longitudinal section

Figure 3 shows a third embodiment of an inventive annular adaptive

Polishing tool in longitudinal section Figure 4 shows a fourth embodiment of an inventive annular adaptive

Polishing tool in longitudinal section

Figure 5 shows a fifth embodiment of an inventive annular adaptive

Polishing tool in longitudinal section

6 shows a sixth embodiment of an inventive annular adaptive

Polishing tool in longitudinal section (variant of the fifth embodiment) Figure 7 shows a seventh embodiment of an inventive annular adaptive

Polishing tool in longitudinal section (variant of the fourth embodiment) Figure 8 shows a first embodiment of a device according to the invention

Polishing of spectacle lens surfaces in a schematic representation. The

Adjustment of the angle of attack of at least partially ringtonian

Polishing surface of the polishing tool for held by means of a workpiece holder, in particular a block piece spectacle lens by means of a

Swivel device for pivoting the polishing tool

9 shows a second embodiment of a device according to the invention for

Polishing of spectacle lens surfaces in a schematic representation. 10 shows a third embodiment of a device according to the invention for

Polishing of spectacle lens surfaces in a schematic representation. Figure 1 1 shows a fourth embodiment of a device according to the invention for

Polishing of Bri llenlinsenoberflächen in a schematic representation. Figure 12 shows a fifth embodiment of a device according to the invention for

simultaneous polishing processing of more than one spectacle lens surfaces in a schematic representation.

13 shows a sixth embodiment of a device according to the invention for the simultaneous polishing of more than one spectacle lens surfaces in a schematic representation.

FIG. 14 shows geometric engagement conditions during the machining process with a ring-adaptive polishing tool according to the invention according to FIG. 1 at an inclination relative to an optical axis of a spectacle lens of 15 ° in a schematic representation

a) view from the side

b) top view through the spectacle lens

FIG. 15 shows geometric engagement conditions during the machining process with a ring-adaptive polishing tool according to the invention according to FIG an inclination relative to the optical axis of the spectacle lens of 30 ° in a schematic representation

a) view from the side

b) top view through the spectacle lens

16 shows geometric engagement conditions during the machining process with an inventive annular-adaptive polishing tool according to the figure 1 at an inclination relative to the optical axis of the spectacle lens of 45 ° in a schematic representation

a) view from the side

b) top view through the lens through

FIG. 17 shows geometrical engagement conditions during the machining process with a ring-adaptive polishing tool according to the invention according to FIG. 1 at an inclination relative to the optical axis of the spectacle lens of 60 ° in a schematic representation

a) view from the side

b) top view through the spectacle lens

FIG. 18 is a flow chart of a first embodiment of a device according to the invention

Process for the polishing treatment of a spectacle lens surface or a casting shell for the manufacture of spectacle lenses

FIG. 19 shows a flowchart for illustrating optimization algorithms which can be implemented individually, in a selection or in a complete combination in the method according to the invention for polishing a spectacle lens surface or a casting shell for spectacle lens production of the first exemplary embodiment.

FIG. 1 shows a first exemplary embodiment of a ring-adaptive polishing tool 100 according to the invention and a block blocked on a block piece (not shown)

Spectacle lens 104 in longitudinal section. The annular adaptive polishing tool 100 is held by a spindle 106 rotatably driven about its center axis A 106. The direction of rotation of the rotary drive of the spindle 106 is shown in FIG. 1 with the aid of the arrow marked KM.

The ring-shaped ig-adaptive polishing tool 100 comprises a rigid support 1 10, which in the present embodiment, a shaft 1 10a, a rotatably connected thereto Circular disc 1 10b and an outer peripheral side rotatably fixed circumferentially arranged annular torus section 110c includes. By circumferential ring torus section is meant an annular (circumferential) segment of the shell of a ring torus, that is to say an annular partial surface of the annular torus surface. In this case, the ring torus section 1 10c is accordingly an annular torus outer surface minus the surface which adjoins the outer circumference of the circular disk 11b.

The center axis Aio _{6 of} the spindle 106 and the center axis Ai io of the ring torus section 1 10c coincide. On the surface 1 1 OD of the ring torus section 1 10c, an elastic body 1 14 is arranged. The surface 1 18 of this elastic body 1 14 has a ring-gate shape. Also, the center axis is off with the above

Central axes Aioe, Ano identical. On the elastic body 1 14 a polishing pad 1 16 preferably constant thickness is applied. The elastic body 1 14 and the polishing pad 1 16 and the ring torus 1 10c of the carrier 1 10 and the elastic body 1 14 are each rotatably connected by means of an adhesive 1 15. This arrangement of carrier 1 10, elastic body 1 14 and polishing pad 1 16 forms a so-called polishing lip 128 formed by the outer contour of the polishing pad 1 16 16 formed polishing surface.

The rigid support 110 can be made of a metallic material, such as e.g. Stainless steel, or plastic, such. Acrylonitrile-butadiene-styrene (ABS), polymethyl methacrylate (PMMA), polyamide (PA), fiber reinforced plastic, e.g. carbon fiber reinforced plastic (CFRP), glass fiber reinforced plastic (GRP), etc., be made.

The elastic body 1 14 consists of a material whose modulus of elasticity is greater than 0.02 N / mm ² . Suitable materials for the elastic body 114 are elastomers such as rubber, rubber, in particular polyurethane, Polyätherurethan or the like into consideration.

The thickness d of the elastic body 1 14 in the present embodiment is 1, 5 cm. Thicknesses between 0.3 cm and 3 cm, preferably between 0.5 cm and 2 cm, most preferably between 0.8 cm and 1, 5 cm have been found to be favorable.

The polishing pad 1 16 may be a polishing film, a technical textile, an abrasive coating or a combination of such materials. Polishing foils for polishing

Eyeglass lenses are made of polyurethane, for example. A possible combination could be eg Polyurethane coating with embedded diamond particles. The thickness of the polishing film is generally about 0.5 mm to about 3.0 mm, that of an abrasive coating 0.3 mm to 3.5 mm, most preferably between 0.5 mm to 3.0 mm. The polishing pad 1 16 is thus in terms of its thickness in the figure 1 (and also in Figures 2 to 13) not to scale

played.

The ring torus section forming the closed ring-shaped polishing surface 120 in the present exemplary embodiment has a main radius R (ring radius) of 50 mm and a minor radius r (lip radius) of 15 mm. This results in an aspect ratio A = R / r of 3.33. For this configuration, the main radius R can generally assume a value between 20 and 200 mm and the minor radius r a value between 2 and 50 mm.

The aspect ratio A is preferably chosen to be between 1.5 and 100, more preferably between 2.5 and 40, most preferably between 3 and 8.

The polishing surface 120 or the closed annular torus section or the annular partial shell extends in the longitudinal section shown in FIG. 1 along the central axis A106, Ano, Aug over an angle oti of approximately 270 °. In particular, it comprises the partial shell surface directed outwards from the center axis Aus of the ring torus in the radial direction (ie in the direction of the main radius R), which extends completely over the angle a ₂ of 180 °. Since this radially outwardly directed part shell surface extends over half of the full angle, it is referred to in the present description as a radially outwardly directed annular half-shell surface, although their surface area does not equal half the surface area of the entire ring gate.

FIG. 2 shows a second embodiment of a ring-shaped adaptive polishing tool 200 according to the invention in longitudinal section. As in the previous exemplary embodiment, the annular-adaptive polishing tool 200 is rotationally driven by means of spindle 106.

The annular adaptive polishing tool 200 in turn comprises a rigid support 210 with shaft 210a and with this rotatably connected disc 210b. In the present exemplary embodiment, the disk 210b has a rounded edge contour 212 which has a ring-shaped surface shape. On the ring-orally rounded edge contour 212 of the carrier 210, an elastic body 214 of preferably uniform thickness d is arranged. Due to its uniform thickness d and the ring-shaped contact surface 212, this elastic body 214 has a closed (or encircling) ring-or toric surface section 218 on its side facing the spectacle lens (not shown). On the elastic body 214, a polishing pad 216 is also preferably of constant thickness attached. The edge contour 212 of the carrier 210, the elastic body 214 and the polishing pad 216 are non-rotatably connected together as in the previous embodiment by means of an adhesive 215. This arrangement of rigid support 210, elastic body 214 and polishing pad 216 forms the polishing lip 228 with the polishing surface 220 formed by the outer contour of the polishing pad 216.

The center axes Α ₁₀ 6, A210, A218 of spindle 106, annular (sub) surface 212 of the carrier 210 and closed annular (part) surface 218 of the elastic body 214 are identical as in the previous embodiment.

In the present embodiment, the polishing pad 216 completely covers the side of the elastic body 214 facing the eyeglass lens surface. However, it would also be possible to provide only the closed annular portion 218 or an annularly closed portion of this portion 218 of the elastic body 214 with a polishing pad 216. In the first two cases, the polishing surface 220 includes those associated with the first

Exemplary embodiment described radially outwardly ringtonian Haibschalenfläche. In FIG. 2, this is indicated by means of the angle a ₂ = 1 80 °.

As materials for the rigid support 210, the elastic body 214 and the polishing pad 216, the materials proposed in connection with the first embodiment can also be used in this configuration.

The ring torus, the partial surface of which forms the ring-oring polishing surface 220, is shown in FIG

Embodiment a main radius R of 50 mm and a minor radius r of 15 mm. For this configuration, the main radius R can generally assume a value between 20 mm and 200 mm and the minor radius r a value between 2 mm to 50 mm.

The aspect ratio A is usually chosen between 1, 5 and 100. Further preferably, A takes values between 2.5 and 40, most preferably between 3 and 8. FIG. 3 shows a third exemplary embodiment of a ring-adaptive polishing tool 300 according to the invention. As in the preceding exemplary embodiment, the ring-form adaptive polishing tool 300 is rotationally driven by spindle 106 about its center axis A106.

This annular adaptive polishing tool 300 according to FIG. 3 is largely identical to the annular adaptive polishing tool 200 according to FIG. 2. The polishing tool 300 in turn comprises a rigid support 310 with shaft 310a and with this rotatably connected disc 310b. The disk 310b has a rim contour section rounded round in the manner of a torus section.

In contrast to the exemplary embodiment according to FIG. 2, the disk-shaped region 310b of the rigid carrier 310 is completely enveloped by an elastic body 314, preferably of uniform thickness. The elastic body 314 has, on its side of the eyeglass lens, which is not shown here, a ring-tinged side

Surface portion 318 on. On the elastic body 314 -here the elastic body 314 is not completely overlapping-a polishing pad 316 also preferably constant thickness applied. The edge contour 312 of the carrier 310, the elastic body 314 and the polishing pad 316 are non-rotatably connected to one another by means of an adhesive 315 as in the previous exemplary embodiments. This arrangement of rigid support 310, elastic body 3 14 and polishing pad 316 forms the polishing lip 328 with the polishing surface 320 formed by the outer contour of the polishing pad 316.

In this exemplary embodiment, the polishing pad 316 does not completely cover the side of the elastic body 314 facing the lens surface 104. However, it would also be possible to provide both the entire surface and only the annular portion 315 or a portion of this annular portion 315 of the elastic body 314 with a polishing pad 316. In the first two cases, the polishing surface 320 comprises the radially outward annular toric described in connection with the first embodiment

Half shell surface. In FIG. 3 this is again indicated by means of the angle a2 = 180 °.

The ring torus, of which a section or segment forms the ring-shaped polishing surface 320, has in the exemplary embodiment a main radius R of 50 mm and a minor radius r of 10 mm up. For this configuration, the main radius R can generally assume a value between 20 mm and 200 mm and the minor radius r a value between 2 mm to 50 mm. Preferably, the aspect ratio A is chosen to be between 1.5 and 100, more preferably between 2.5 and 40, most preferably between 3 and 8.

The central axes A106, A310, A3 ig of spindle 106, annular (sub) surface 312 of the carrier 310 and annular (surface) surface 318 of the elastic body 314 are as in the previous embodiment! identical.

As materials for the rigid support 310, the elastic body 314 and the polishing pad 316, the materials proposed in connection with the first exemplary embodiment can also be used in this configuration.

FIG. 4 shows a fourth exemplary embodiment of a ring-adaptive polishing tool 400 according to the invention connected to a tool spindle 106 and rotatable in the direction of rotation cc> i. This ring-shaped ig-adaptive polishing tool 400 according to FIG. 4 in turn comprises a rigid support 410 which in FIG present

Exemplary embodiment of a shaft 410a, which is rotatably connected at one end to the tool spindle 106, and one with this other end side rotatably connected hollow cylinder 410b. The hollow cylindrical end 410b of the rigid support 410 carries on its

Eyeglass lens facing end has a ring-gate geometry 424.

The surface of the hollow cylinder 410 has an inwardly-facing cylinder-jacket-shaped shape 41 Od and an outward-facing cylinder-jacket-shaped shape 410 c and the end-side ring-toric shape 424. The entire surface 410c, 41d0, 424 of the

Hollow cylinder 410 is enveloped by an elastic body 414 of substantially constant thickness.

The elastic body 414 has on its side facing the spindle 106 a

cylinder jacket-shaped portion 417 and at its the spectacle lens side facing a ringing toric section 415 on. On the elastic body 414, a polishing pad 416 is attached. This arrangement of rigid support 410, elastic body 414 and polishing pad 416 also forms a polishing lip 428 analogous to the preceding embodiments with the polishing surface 420 formed by the outer contour of the polishing pad 416. In the present exemplary embodiment, the polishing pad 416 completely covers the side of the elastic body 414 facing the lens surface 104. However, it would also be possible to provide only the annular portion 415 of the elastic body 414 with a polishing pad 416. As in the examples according to FIGS. 2 and 3, the closed annular area segment extends over an angle of 180 ° in the illustrated longitudinal section.

Notwithstanding the exemplary embodiments described above, the angular component ot _{2 of} the radially outward-facing ring torus segment is only about 90 °. The angle portion a _{3 of} the radially inwardly directed ring torus segment is also 90 °. The ring torus segment over both angular components a ₂ , 0: 3 faces the axial direction of the ring torus. Since the directed in the direction of the center axis A "n8 of the ring torus part shell surface over the angle a ₂ + 0C3 of 180 °, ie over half of the full angle extends, it is referred to in the context of the present description as axially outwardly directed annular half-shell surface ,

As materials for the rigid support 410, the elastic body 414 and the polishing pad 416, the materials proposed in connection with the first embodiment can also be used in this configuration.

The ring torus, the partial surface of which forms the ring-oring polishing surface 420, is shown in FIG

Embodiment a main radius R of 45 mm and a minor radius r of 10 mm. For this configuration, the main radius R can generally assume a value between 20 mm and 200 mm and the minor radius r a value between 2 mm to 50 mm.

Preferably, the aspect ratio A is chosen to be between 1.5 and 100, more preferably between 2.5 and 40, most preferably between 3 and 8.

The center axes A100, A410, A ₄₁₈ of spindle 106, annular (sub) surface 424 of the carrier 410, and ringing (sub) surface 418 of the elastic body 414 are identical as in the embodiments described above.

FIG. 5 shows a fifth embodiment of a ring-adaptive polishing tool 500 according to the invention which can be driven rotationally in the direction of rotation by a tool spindle 106 and a spectacle lens 504 machined therewith. This polishing tool 500 is particularly suitable for polishing convex spectacle lens surfaces 522. The annular adaptive polishing tool 500 is held by the above-described spindle 106 of a processing machine rotatably driven about its center axis A. The direction of rotation of the rotary drive of the spindle 106 is indicated in FIG. 5 by means of the arrow marked with the reference character CO.

The annular adaptive polishing tool 500 includes a rigid support 510 having, in the present embodiment, a shaft portion 510a, a circular disk portion 510b, a cylinder jacket portion 510c, and a circular disk portion 510d. Einendseitig the shaft portion 510a with the tool spindle 106 is rotatably connected. At the other end, the circular section 510b connects centrally to the shaft section 510a in a rotationally fixed connection. On the outer circumference, the circular-disk section 510b is adjoined by the cylinder-jacket section 510c with one end in a rotationally fixed connection. The other end of the cylinder barrel portion 510c rotates into the outer periphery of the annular disk portion 51Od in a rotationally fixed connection.

On the inner circumference, the circular ring disk section 51 Od has a rounded edge contour forming a ring torus section 512. The center axis Λ106 of the spindle 106 and the center axis A510 of the ring torus portion 512 of the carrier 510 coincide. On the ring torus section 512, an elastic body 514 is disposed. The surface 518 of this elastic body 514 has a ring-toric shape. Also these central axis A ₅₁₈ is identical to the above-mentioned center axis A106, A510.

On the elastic body 514, a polishing pad 516 preferably constant thickness is applied. The elastic body 14 and the polishing pad 516 and the ring torus 512 of the carrier 510 and the elastic body 514 are each rotatably connected by means of an adhesive 515. This arrangement of carrier 510, elastic body 514 and polishing pad 516 forms a polishing lip 528 with a polishing surface 520 formed by the outer contour of the polishing pad 516.

The rigid support 510 may be made of a metallic material, such as e.g. Aluminum, copper or stainless steel, or also plastic, e.g. Acrylonitrile-butadiene-styrene (ABS),

Polymethyl methacrylate (PMMA), polyamide (PA), fiber reinforced plastic, such as carbon fiber reinforced plastic (CFRP), glass fiber reinforced plastic (GRP), etc., be made.

The elastic body 514 is made of a material whose modulus of elasticity is preferably greater than 0.02 N / mm ² . Suitable materials for the elastic body 514 are elastomers such as rubber, rubber, in particular polyurethane, Polyätherurethan or the like into consideration.

The polishing pad 516 may be a polishing film, a technical textile, an abrasive coating, or a combination of such materials. Polishing foils for polishing

Eyeglass lenses may e.g. consist of polyurethane or have polyurethane as an ingredient. One possible combination could be e.g. a polyurethane polishing pad with embedded

Be diamond particles. The thickness of the polishing film is generally about 0.5 to about 3.0 mm, that of an abrasive coating about 0.5 to 3.0 mm.

The partially ring-trained polishing surface 520 has in the present

Embodiment a main radius R of 20 mm and a minor radius r of 10 mm. This results in an aspect ratio A = R / r of 2. Also for this configuration, the main radius R can generally assume a value between 20 and 200 mm and the minor radius r a value between 2 to 50 mm. Preferably, the aspect ratio A is chosen to be between 1.5 and 100, more preferably between 2.5 and 40, most preferably between 3 and 8.

The polishing surface 520 or the closed ring torus section or the annular partial shell extends in the longitudinal section shown in FIG. 5 along the central axis A _i06 , A ₅ i ₀ , A518 over an angle 0: 3 of approximately 180 °. Because these are directed radially inward

Part shell surface extends over half of the full angle, it is referred to in the context of the present description as a radially inwardly directed ring-shaped half-shell surface.

FIG. 6 shows a variant of the exemplary embodiment according to FIG. 5. Once again shown is the polishing tool 600, which can be driven by the spindle 106 in a rotating manner about its center axis Aioc. The polishing tool 600 has a sectionally ring-trained Polishing surface 620, which is aligned as the polishing surface 520 of the polishing tool 500 according to FIG 5.

The partially ring-shaped polishing surface 620 has in this variant a main radius R of 40 mm and a minor radius r of 10 mm. This results in an aspect ratio A = R / r of 4.

FIG. 7 shows a seventh exemplary embodiment of a ring-adaptive polishing tool 700 that is connected to a tool spindle 106 and can be driven rotationally in the direction of rotation © by this annularly adaptive polishing tool 700. This annularly adaptive polishing tool 700 according to FIG. 7 in turn comprises a rigid carrier 710 which in the present embodiment

Embodiment of a shaft 710a, which is rotatably connected at one end with the tool spindle 106 and a rotatably connected to this andemendseitig hollow cylinder 710b. The hollow cylindrical end 710b of the carrier 710 is formed at its end facing the spectacle lens as a flat surface 712.

On the flat end face 712 of the hollow cylinder 710b, an elastic body 714 is placed, which forms one half of a ring torus. The flat annular surface 714a of the elastic body 714, i. the ring door half, has the same size as the flat annular end face 712 of the hollow cylinder 710. Both surfaces 714a, 712 are non-rotatably bonded together by means of an adhesive 715.

On the elastic body 714 is a polishing pad 716. Also between these two surfaces fixing takes place with the aid of an adhesive 715. This arrangement of rigid support 710, elastic body 714 and polishing pad 716 forms a polishing lip 728 analogous to the previous embodiments with through the outer contour the polishing pad 716 formed polishing surface 720th

In the present exemplary embodiment, the polishing pad 716 completely covers the side of the elastic body 714 facing the eyeglass lens surface. However, it would also be possible to provide only a portion of the annular portion 714b of the elastic body 714 or portions of the rigid support 710 with a polishing pad 716. As materials for the rigid support 710, the elastic body 714 and the polishing pad 716 may also in this configuration in connection with the above

Embodiments proposed materials are used.

The ring torus forming the ring-oring polishing surface 720 in the exemplary embodiment has a main radius R of 50 mm and a minor radius r of 25 mm. For this configuration, the main radius R can generally assume a value between 20 mm and 200 mm and the minor radius r a value between 2 mm to 50 mm. Preferably, the aspect ratio A is chosen to be between 1.5 and 100, more preferably between 2.5 and 40, most preferably between 3 and 8.

The central axes Aioe, A710, A718 of spindle 106, hollow cylinder 710b of the carrier 710, and annular (sub) surface 714b of the elastic body 714 coincide as in the above-described embodiments.

FIG. 8 shows a schematic representation of a first exemplary embodiment of a device 8000 according to the invention for the polishing of spectacle lens surfaces 802. In this device 8000 is a CNC machine with two

characteristic assemblies BG81 and BG82. The assembly BG81 comprises a spindle 806 for driving o> i a polishing tool 800 about the axis of rotation A _m and a (not shown in detail) pivoting device for pivoting the polishing tool 800 about a rotation axis A _g0 6 different from the pivot axis B ₈ o6. The

Pivoting movement directions are in the figure 8 with the reference numeral

Ωι double arrow shown.

The pivoting movement of the assembly BG81 about the pivot axis Bgo6 is CNC controlled and serves for optimal adjustment of the polishing tool 800. This can during the

Polierprozesses constant or the surface geometry of the spectacle lens 80 are positioned or tracked accordingly.

The second assembly BG82 has a receptacle 803 for the workpiece to be machined 801, a first linear actuator 8104 with a first linear axis Lg 10 for positioning the workpiece 801 in the X direction and a second linear actuator 8204 with a perpendicular to the first linear axis Lsm second linear axis Lg204 for the positioning of the Workpiece 801 in the Z direction. In the exemplary embodiment of FIG 8 is the

Pivot axis B ₈ o6 both perpendicular to the axis of rotation A ₈ o6 the spindle 806 as well as on the two linear axes Lgio4, L ₈₂ o4.

As a polishing tool 800, e.g. each of the polishing tools 100 to 700 described with reference to FIGS. 1 to 7 are used. By way of example, in FIG. 8, a variant embodiment according to FIG. 1 is sketched.

The operation of the apparatus 8000 for polishing processing of spectacle lens surfaces 802 will be described below with reference to FIGS. 18 and 19.

First, however, further embodiments of inventive devices for polishing of spectacle lens surfaces and mold shells to

Brillcnlinsenherstellung described.

FIG. 9 shows a second exemplary embodiment of a device 9000 according to the invention for polishing processing of spectacle lens surfaces 902 in a schematic representation. As with the device 8000 according to FIG. 8, this device 9000 is a CNC processing machine with two characteristic assemblies BG91 and BG92. The

The BG91 board is identical to the BG81 board.

The second assembly BG92 comprises the above-described components of the assembly BG82, which are provided in the figure 9 in a corresponding manner by the reference numerals 903, 9104, 9204. Moreover, in the exemplary embodiment according to FIG. 9, an additional pivoting device is provided for pivoting the two linear drives 9104 and 9204 about a C904 axis, which permits a rotational positioning Ω _{2 of} the spectacle lens 901, thus optimizing alignment with the individual spectacle lens geometry To allow pivoting movement Ωι the BG91 module.

As polishing tool 800, each of the polishing tools 100 to 700 described with reference to FIGS. 1 to 7 can also be used here. By way of example, FIG. 9 shows an embodiment according to FIG. 1. FIG. 10 shows a third exemplary embodiment of a device 10000 according to the invention for the polishing processing of spectacle lens surfaces 1002 in a schematic representation. This device 10000 is a CNC processing machine with the two characteristic assemblies BG 101 and BG 102. The assembly BG 101 has a spindle 1006 for driving a polishing tool 1000 about a spindle axis Aiooe axis of rotation. The assembly BG101 further comprises a linear drive 10104, by means of which the spindle 1006 along its center axis A1006 = Liooe can be linearly displaced in the X direction.

The second assembly BG 102 has a receptacle 1003 for a workpiece to be machined 1001 and a linear actuator 10204 to move the receptacle 1003 along an axis L ₁₀₂₀₄ in the Z direction. In addition, in the exemplary embodiment according to FIG. 10, a pivoting device 10204 (here realized in the linear drive 10204) is provided in order to pivot the workpiece 1001 about a pivot axis B 10204.

FIG. 11 shows a fourth exemplary embodiment of a device 10100 according to the invention for polishing processing of spectacle lens surfaces 1 102 in a schematic representation. The device 10100 comprises the two characteristic assemblies BG 1 1 and BG 12. The assembly BG 1 1 1 is designed like the assembly BG 101. It has a spindle 1 106 for driving a polishing tool 1 100 about a spindle axis-central axis of rotation Ano6. The assembly BGL 11 also has a linear drive 1 1104, by means of which the spindle 1 106 along its center axis A _{1 10} 6 ⁼ Luo can be linearly displaced in the X direction.

The second module BGL 12 comprises the features of the module BGL 02. It thus comprises a receptacle 1 103 for a workpiece to be machined 1 101 and a linear drive 1 1204 to move the receptacle 1 103 along an axis L1 1204 in the Z direction. In addition, in the exemplary embodiment according to FIG. 11, a pivoting device 1 1204 (realized here in the linear drive 1 1204) is provided in order to pivot the workpiece 1 101 about a pivot axis B 1 1204.

Like the second subassembly BG92 according to FIG. 9, in the second subassembly according to FIG. 11 an additional pivoting device is provided for pivoting the linear drive 1 1204 about a Ci 1204 axis which allows a rotational positioning Ω 2 of the spectacle lens 1 101, so as to allow optimized as a function of the individual spectacle lens geometry alignment with the pivoting movement Ωι the assembly BG l 1 1.

In the further exemplary embodiments of devices 10000, 10100 according to FIGS. 10 and 11 according to the invention, in contrast to the illustrations in FIGS. 8 and 9, the pivot axis is in each case in the second subassembly assigned to the workpiece.

Figures 12 and 13 show further exemplary embodiments of the device 10200, 10300 according to the invention. In principle, the structures correspond to the arrangements of Figures 10 and 11, in which case the second assemblies BG102, BG l 12 are duplicated and in Figures 12 and 13 as BG 02a, 02b and 112a, 1 12b are designated so as to allow the simultaneous processing of two spectacle lenses. All linear and rotary actuators can be controlled independently of each other, so as to be able to position the respective workpieces simultaneously and independently of each other in the linear direction XI, X2, ZI, Z2 and pivot directions B 1, B2, Cl, C2. It is also possible to provide the second assemblies BG l 02, BGl 12 more than twice, thus increasing the number of simultaneously processed glasses.

Figures 14 a) and b) show the geometrical engagement conditions during the

Machining process of an inventive ring-shaped ig-adaptive polishing tool 100 of Figure 1 at an inclination γι the center axis A _\ oc> the polishing tool 100 driving tool spindle 106 relative to an optical axis A104 of the spectacle lens 104 of 15 ° in a schematic representation and that from a view from the side (Figure 14 a)) and in plan view through the spectacle lens 104 through (Figure 14 b)).

Figures 15 to 17 show the annular adaptive polishing tool 100 of Figure 1 in the same views at different inclinations y ₂ , γ ₃ , γ ₄ relative to the optical axis Aio4 of the spectacle lens 104 of 30 °, 45 ° and 60 °.

The figures 14 a), 15 a), 16 a), 17 a) are drawn as if the ring-toric shape of the outer contour of the polishing pad 1 16 of the ring-shaped adaptive polishing tool 100 is the

Outer contour 122 of the spectacle lens 104 penetrate. In fact, however, the elastic body 1 14 and thus the polishing pad 1 16 is deformed and the polishing pad 1 16 is (in the first approximation within the respective cutting lines 1402, 1502, 1602 1702) flat on the lens surface 122 on. The respective contact surfaces are in the figures 14 b), 15 b), 16 b), 17 b) with the

Reference numerals 1404, 1504, 1604, 1704 are indicated.

FIG. 18 shows a flowchart 1800 of an exemplary method according to the invention for polishing a spectacle lens surface.

In a first step 1801, a mathematical description of the spectacle lens surface to be processed is provided.

In a second step 1802, which can also take place before the first step 1801, there is provided a mathematical description of the ring-gate section of FIG

Polishing surface of the polishing tool.

In a third step 1803, the entire spectacle lens surface is approximated by a bestfit ring torus. The torus axis of the Bestfit Ringtorus is in the present

Exemplary embodiment determined as the preferred feed direction of the polishing tool. In principle, it is of course possible to set the feed direction in a different way.

In a fourth step 1804, the spectacle lens surface is divided into area segments orthogonal to the feed direction of the polishing tool.

In a fifth step 1805, an average curvature is calculated for each of these surface segments as the starting point of the following iteration calculation.

In the sixth step 1806, the ideal tool inclination is iterated for each of these surface segments.

In a seventh optional step 1807, the tool inclination and the delivery can be optimized with regard to the desired local pressure distribution and thus the local removal rate.

In an eighth step 1808, the data for the control of a CNC processing machine according to the invention is calculated. In principle, it can be any of those in FIGS. 8 to 13 shown machines are used. In particular, a calculation of the CNC data for the complete polishing process with continuous, surface segment-dependent

Tool tilt and infeed motion. In the limiting case, the entire area to be polished can be used as a single area segment for the further calculation, which simplifies the above-mentioned calculation steps 1804 to 1808 accordingly.

FIG. 19 shows a flowchart for illustrating optimization algorithms which can be implemented individually, in a selection or in a complete combination in the method according to the invention for polishing a spectacle lens surface or a casting shell for spectacle lens manufacturing of the first exemplary embodiment according to FIG.

In particular, method step 1806 according to FIG. 18 can contain the following optimization algorithms:

A sub-step of process step 1806, designated by reference numeral 1806a in Figure 19, may include ensuring that each approximately kidney-shaped segment surface element is completely swept by the annular-adaptive polishing tool

A sub-step of method step 1806, identified by reference numeral 1806b in Figure 19, may include ensuring that the compression of the annular-adaptive polishing tool, in particular the deformation of the elastic body in each surface point of the spectacle lens, is within defined limits.

A sub-step of method step 1806, which is identified by the reference numeral 1806b in FIG. 19, may be an optimization of the tool inclination such that within the segment surface elements a predetermined mean value of the compression is achieved and at the same time the differences of the compression values become minimal.

A further sub-step 1806d can be an optimization of the feed rate along the large torus radius (main radius), so that the residence time differences caused by tool tilt change are compensated. Another sub-step 806e may be an optimization of the compression values of the

Polishing tool by changing the tool inclination to compensate for local, for example residence time-related Abmendinhomogenitäten.

Finally, a sub-step 1806f can also be used in an empirically supported derivative calculation of tool tilt. Feed and delivery exist.

Claims

claims:

1. Polishing tool (100) for surfaces of spectacle lenses and mold shells for

Eyeglass lenses having a polishing lip (11 8) comprising a rigid body (1 10) with a polishing surface (120) having at least one closed ring or toric section, characterized in that the body is in the form of a support (1 10) and that on the support (1 10) an elastic body (1 14) and a polishing pad (1 16) are arranged.

2. polishing tool (100) according to claim 1, characterized in that the closed ring-or toric portion of the polishing surface (120) has a Ringtorushalbmesser (R) and a

Has lip radius (r) and in that a of the quotient of the Ringtorushalbmesser (R) and the lip radius (r) formed aspect ratio (A) has a value between 2 and 100, preferably between 2.5 and 40, most preferably between 3 and 8 ,

3. polishing tool (100) according to claim 1 or 2, characterized in that the

Ringtorus radius (R) between 20 and 200 mm, most preferably between 30 and 80 mm and a lip radius (r) between 2 and 50 mm, most preferably between 5 and 20 mm.

4. polishing tool (100) according to any one of the preceding claims, characterized in that the rigid support (1 10) has a closed annular outer contour portion on which the elastic body (1 14) is arranged and that the elastic body (1 14) a has constant thickness (d).

5. polishing tool (100) according to any one of the preceding claims, characterized in that the rigid support (1 10) has a hollow cylindrical portion with a flat end face (1 12), on which the elastic body (1 14) is arranged and that of elastic body (114) has a closed annular outer contour portion.

6. polishing tool (100) according to any one of the preceding claims, characterized in that the closed ring-or toric portion of the polishing surface (120) has a radially outwardly directed ring-shaped half-shell surface or a radially inwardly directed ring-shaped Haibschalenfläche.

7. A method (1 100) for polishing a spectacle lens surface (122) or a Gießformschalenoberfläche with a polishing tool (100) having a rigid body (1 10) comprising a polishing lip (1 18) with a polishing surface (120), the at least one closed ring Section has, characterized in that the rigid body (1 10) is designed as a carrier and that on the rigid support (1 10), an elastic body (1 14) and a polishing pad (1 16) are arranged.

8. The method according to claim 7, characterized in that the polishing tool (100) and the spectacle lens surface (122) or the Gießformschalenoberfläche are moved relative to each other such that the elastic body (1 14) is deformed.

9. The method according to any one of claims 7 or 8, characterized in that the

Polishing tool (100) and the spectacle lens surface (122) or the Gießformschalenoberfläche are moved relative to each other such that the polishing surface (120) on the

Eyeglass lens surface (122) or the mold shell surface rests strip or kidney-shaped.

10. The method according to any one of claims 7 to 9, characterized in that the geometry of the polishing surface (120) and the geometry of the spectacle lens surface (122) or the

Mold shell surface for the instantaneous relative movement of the polishing surface (120) to the Bri llen I insen surface (122) or the Gießformschalenoberfläche is taken into account. 1. The method according to claim 10, characterized in that the geometry of the polishing surface (120) and / or the geometry of the Bri I lenl insen surface (122) or the

Mold shell surface is provided in the form of a mathematical description.

12. The method according to claim 1 1. characterized in that the geometry of

Spectacle lens surface (122) or the Gießformschalenoberfläche is approximated by at least one toric surface segment.

13. The method according to any one of claims 8 to 12, characterized in that the

Polishing tool (100) the spectacle lens surface (122) or the Gießformschalenoberfläche with the polishing lip (1 18) on a contact surface (704, 804, 904, 1004) touching over the

Spectacle lens surface (122) or the mold shell surface is guided and that a Inclination of the polishing tool (100) relative to the spectacle lens surface (122) or the Gießformschalenoberfläche while minimizing the differences in the deformation of the elastic body (1 14) is set within the contact surface.

14. A computer program with program code for performing all method steps according to one of claims 7 to 13, when the computer program is loaded into a computer and / or executed in a computer.

15. An apparatus (600) for polishing a spectacle lens surface (122) or a mold shell surface with a polishing tool (100) having a rigid lip (118) comprising a rigid body (110) having a polishing surface (120) having at least one closed ring or toric portion , characterized in that the rigid body (1 0) is designed as a carrier and that on the rigid support (110), an elastic body (1 14) and a polishing pad (1 16) are arranged.

16. The apparatus according to claim 15, characterized in that a guide device is provided to guide the polishing tool (100) the elastic body (1 14) deforming over the spectacle lens surface (122) or the Gießformschalenoberfläche.