US3900971A - Machine for producing surfaces of optical lenses, for example toric surfaces - Google Patents

Machine for producing surfaces of optical lenses, for example toric surfaces Download PDF

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Publication number
US3900971A
US3900971A US402320A US40232073A US3900971A US 3900971 A US3900971 A US 3900971A US 402320 A US402320 A US 402320A US 40232073 A US40232073 A US 40232073A US 3900971 A US3900971 A US 3900971A
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United States
Prior art keywords
movement
control
holder
grinding
polishing machine
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Expired - Lifetime
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US402320A
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English (en)
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Erhard Brueck
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WILHELM LOH KG
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WILHELM LOH KG
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Priority claimed from DE19722252498 external-priority patent/DE2252498C3/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/02—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor by means of tools with abrading surfaces corresponding in shape with the lenses to be made
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/04—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor grinding of lenses involving grinding wheels controlled by gearing
    • B24B13/043—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor grinding of lenses involving grinding wheels controlled by gearing using cup-type grinding wheels

Definitions

  • ABSTRACT Machine for forming predetermined surfaces, such as toric surfaces on optical lenses.
  • the machine is of a type in which the surfaces are determined by a base cam and by a transverse cam which is caused to move lengthwise of the base cam.
  • the machine further has a [30] Foreign Application Priority Data Oct 26 972 German 2252498 frame, a first holder for a rotatable cup-shaped cutting y tool, a second holder for the workpiece and coordinat- [52] U S C] 5l/100 51/55 51/124 L ing mechanism for producing predetermined relative [51] Int Cl B24b 17/10- i324 9/14 movement between said holders.
  • the apparatus is par- [58] Fie'ld 'g 51/55 54 93 100 R ticularly characterized in that the coordinating mecha- 51/157 nism so controls the holders that the workpiece axis n the tool axis are always in the same plane or para]- [56] References Cited lel planes and the relative movement between the STA S P NTS holders comprises movement along axes which are po- UNITED TE ATE sitioncd perpendicularly to one another.
  • a device is 2,47 .021 194 DAvaucourt 1/1 R provided for effecting automatic operation and for ob- 2,633,675 4/1953 Ellis 51/124 L m g a wide range of adjustability to p i the g g manufacture of lenses having a wide range of con- 8/1969 352 5l/284 tours, said latter including convex, concave and vari- 3,492, 764 2/1970 Dalton 51/124 L able 3,670,460 6/1972 Oldfield Ct al.
  • the invention relates to a machine for producing surfaces for optical lenses, particularly toric lens surfaces, wherein such surfaces are defined by a base cam and by a transverse cam which is moved along said base cam.
  • apparatus including a frame, a first holder for a rotatable cup-shaped cutting tool with a cutting lip which linearly contacts the workpiece, wherein the diameter of the tool and the sloped position of its axis relative to the base cam determines the form of the transverse cam particularly with respect to a nonrotatable workpiece. It also includes a second holder for the workpiece, particularly the rotatable cutting tool, and a coordinating mechanism for producing a predetermined relative movement between the first and second holder.
  • toric lens surfaces should be considered to facilitate an understanding thereof, such manufacture of toric lens surfaces having great importance in the manufacture of eyeglasses.
  • the invention is, however, not limited to machines with which toric lens surfaces can be manufactured inasmuch as the cams which are identified hereinafter as base cam and cylinder cam can also depart from a circular, or an approximately circular, shape.
  • a toric surface is created by the rotation of a circular are at a certain distance around an axis which lies in the same plane as the circular arc. If the distance from the axis of rotation is larger than the circular arc radius, then a ring torus is created; if the distance is smaller, then a ton torus is created.
  • toric surfaces of eyeglesses are parts of ring tori.
  • the circle along which the producing circular arc of the torus is moved will be identified hereinafter as the base cam and the producing circular arc itself will be identified as the cylinder cam.
  • cup-shaped tools are usually used, as illustrated schematically in FIGS. 1 and 2 of the drawings.
  • the annular cutting lip b is brought into contact with the workpiece and is swung at a selected radius R about the workpiece.
  • the radius which is thus produced on the workpiece is the above-mentioned base cam.
  • the axis of rotation c of the cup-shaped tool a is adjusted in the plane of the base cam at a certain angle Bto the line which connects the pivotal centerpoint and the cutting lip point p which produces the base cam.
  • the cylinder cam is produced simultaneously.
  • the adjusting angle ,3 for determining the cylinder cam depends on the diameter of the tool.
  • the cylinder cam is determined by the sloped position of the tool.
  • the cylinder cam therefore, frequently departs slightly from an exactly circular arc. However, the deviation is so small that it as a rule can be accepted.
  • the basic purpose of the invention is to construct a machine of the type mentioned above in such a manner that the radius of the base cam may be of any desired size, including infinite, with only a small size of machine.
  • coordinating mechanism which consists of a control mechanism controlling one or both holders, that the workpiece axis and the tool axis remain always in the same plane or in parallel planes and the relative movement between the holders comprises a pivotal movement and a movement along axes which are positioned perpendicularly to one another.
  • the base cam is not directly passed through by the tool or workpiece.
  • the same relative positions between tool and workpiece, as they exist in the known machines, are here achieved in such a manner that a selected sloped position of the tool axis relative to the workpiece axis is fixedly coordinated with a selected relative position of tool and workpiece in a retangular coordinate system.
  • the movement which is carried out in known machines by a pivoted arm is divided into movements along rectangular coordinates and a slopedposition movement. In this manner, a very compact design is obtained because only paths of movement of the size of the workpiece diameter are needed and a change of the base cam does not require any adjusting between tool and workpiece holder.
  • the movements can easily be so controlled that during stock removal the same relative movements between workpiece and tool are created, as would be created in the case of an as much as possible short or a very long, in a border case an infinitely long, swinging arm, as it would be necessary in known machines.
  • the movements can also be coordinated in such a manner that the base cam is neither a straight line (infinite radius) nor a circle (finite radius) but instead has any path, including a path which is variable and of interest in the manufacture of special eyeglasses, for example eyeglasses with areas of different refractive power.
  • the first holder is movable relative to the machine frame along coordinates which are positioned rectangularly to one another and the second holder is pivotable about an axis which is arranged fixedly on the machine frame.
  • This division of the movements results in a structurally very simple machine and one in which the moving mechanisms for achieving the pivotal movement of the second holder can be arranged fixedly on the machine frame. This is possible because the pivotal axis is stationary relative to the machine frame.
  • FIG. 1 illustrates three different relative positions between the concave side of an optical lens and a cupshaped tool
  • FIG. 2 is a corresponding illustration, wherein relative positions of a cup-shaped tool to a convex lens surface are illustrated
  • FIG. 3 is a top view of a machine according to the invention.
  • FIG. 4 is a vertical cross-sectional view along the line IV--IV of FIG. 3,
  • FIG. 5 is a cross-sectional view along the line V-V of FIG. 3,
  • FIG. 6 illustrates a part of the machine
  • FIG. 7 is a schematic illustration for explaining the operation of the machine during the manufacture of a concave lens surface and FIG. 8 is an illustration corresponding to FIG. 7 for the manufacture of a convex lens surface.
  • the machine has a frame 60 (FIG. 3) on which are arranged a first holder which is collectively identified by the reference numeral 61 (FIG. 4) and a second holder which is collectively identified by the reference numeral 62.
  • On the inside 63 of the housing-like frame there are arranged the control means for coordinating the movements of the first holder 61 and the second holder 62.
  • the first holder 61 is the workpiece holder and the second holder 62 is the tool holder.
  • the tool 1 is so arranged with respect to its annular cutting lip 2 that the centerpoint of the cutting lip radius coincides with the swivel axis 3 for the second holder 62.
  • the tool 1 is secured on a tool spindle 4 which is clamped in a spindle head 5.
  • the spindle head 5 is provided with a carriage guide 6 and can be laterally adjusted by means of a threaded spindle 7. This adjustability serves to adjust the machine to various diameters of the tool 1.
  • the spindle head 5 is connected to a pivotally mounted arm 8 through a carriage guide 6, said arm being secured on a shaft which is supported rotatably in the machine frame 60 (also called machine column).
  • the axis of the shaft 9 corresponds to the mentioned pivotal or swivel axis 3.
  • the tool spindle 4 is driven by a motor 11 (FIG. 5)
  • the pivotal movement of the tool 1 is produced by means of a hydraulic piston 13 which has teeth 14 mating with a gear 12 secured on the shaft 9.
  • the workpiece 15 is adhesively fastened to a workpiece holder 16 which is secured on a liftable and lowerable rod 17 identified hereinafter as a quill.
  • the quill 17 is provided with an annular piston 18 and is supported axially movably in a machine table 19 comprising a carriage.
  • the quill 17 is secured against rotation by a guide rod 20.
  • the axial movement is caused by hydraulic pressure fluid applied onto the annular piston 18.
  • the machine table 19 is guided movably alongside guideways 21 perpendicularly to the quill axis on the machine column 60.
  • the machine table is moved by means of a hydraulic cylinder 23.
  • a conventional hydraulic power unit 24 supplies the hydraulic pressure.
  • the hydraulic lines are not illustrated.
  • a control cam 25 for producing the base cam is mounted on a holder 26 which is provided on the machine table 19.
  • a scanning arm 27 which is guided in guide bearings scans the control cam 25.
  • a guide arm 29 is provided on the scanning arm 27, which guide arm is aligned exactly parallel to the guideways 21 of the machine table 19.
  • a feeler 31 is mounted on an arm 30 which is secured on the quill 17, which feeler has a scanning pin 32 which abuts under spring pressure the guide arm 29.
  • the feeler 31 transmits during movement of the scanning pin 32 a positive or negative control voltage corresponding with the direction of movement. This voltage is amplified in an amplifier, not illustrated, and is fed to a hydraulic servovalve 33. Same controls the flow of hydraulic liquid to the cylinder 34 in which the annular piston 18 is movable so that the quill 17 is moved in the same direction as the scanning pin 32 and thereby returns the feeler 31 into its zero position.
  • a further control cam 35 for the swinging movement of the tool 1 is mounted on a holder 36 which is identical with the holder 26 for the control cam 25 provided on the machine table 19.
  • a rocking lever 37 which is rotatably supported on a shaft 38 scans the control cam 35.
  • An adjsuting piece 39 for adjusting the angle B (see FIGS. 1 and 2) for selecting the cylinder cam is mounted on the rocking lever 37.
  • the scanning pin 41 of a feeler is pressed by spring pressure against the adjusting piece 39.
  • the feeler 40 is secured on an arm 42 which in turn is fixedly connected to the shaft 38.
  • the shaft 38 is rotatably supported in bearings 43.
  • a disk 44 is positioned fixed with respect to rotation of the shaft 38, on which disk a steel band is secured which loops around the disk 44 at a desired angle.
  • the steel band 45 is secured with its other end on an equally large disk 46 and loops around same also at a selected angle.
  • the disk 46 is connected fixedly with respect to rotation on and with respect to the shaft 9 to provide a mechanical connection through the steel band 45 between control cam 35 and tool 1 in such a manner that the sloped position of the tool, namely its swivel position with respect to the axis 3, is in a fixed relation to the position of the feeler 40 and therewith of the fixed control cam.
  • the steel band is held under tension by means of a weight 47.
  • the weight 47 hangs on a rope 48 which is placed over a disk 44 which in turn is connected fixedly with respect to rotation of the shaft 38.
  • the weight can also be replaced by a spring.
  • the feeler 40 is connected in the same manner as the feeler 31 to a servovalve 50 through a power amplifier.
  • the servovalve 50 controls the flow of a hydraulic liquid to the hydraulic piston 13.
  • control cam 25 For selecting a certain base cam the associated control cam 25 is inserted into the holder 26. Also for the control of the swinging or rocking movement a (see FIGS. 1 and 2) a selected control cam 35 is mounted onto the holder 36. One particular control cam 25 is always associated with a given control cam 35. It is thereby advantageous (to avoid mix-ups) to combined both cams into one unit and so to select the arrangement of the feelers that the control cams can be exchanged as one unit. In the schematic illustration two separate control cams are illustrated for clarity.
  • a corresponding adjusting piece 39 is inserted into the mounting of the rocking lever 37 and the adjusting angle ,8 (FIGS. 1 and 2) is thereby adjusted.
  • the workpiece is brought into contact with the rotating tool 1 and the machine table 19 together with the workpiece 15 is moved by the hydraulic cylinder 23 into the swinging plane of the tool axis.
  • the surface can be worked in one passage, namely during one movement of the machine table 19 from left to right (seen in FIG. 4), and the lens surface is completed.
  • control cams 25 and which are fixedly connected to the machine table 19, are moved relative to the scanning mechanisms.
  • the scanning arm 27 and the rocking lever 37 are thus moved and move the scanning pins 32 and 41 of the feelers 31 and 40.
  • Control signals in the form of positive or negative control voltages are thereby created. These signals are amplified through the power amplifiers and are fed to the servovalves 33 and 50.
  • the servovalve 33 controls the flow of hydraulic liquid into the hydraulic cylinder 34 and thus the movement of the quill 17 on which the workpiece 15 is provided. At the same time, the feeler 31 is moved in the same direction as the scanning pin 32. This enables the workpiece to carry out a movement which equals the contour of the control cam.
  • the servovalve 50 controls the flow of hydraulic liquid to the cylinder 65 in which the piston 13 is movable. Said piston acts through the teeth 14 to move the swinging arm 8 on which the tool 1 is mounted. Through the disks 44 and 46 and the steel band 45, the shaft 38 with the arm 42 and the feeler is swung at the same angle as the scanning pin 41. The pivotal movement of the rocking lever 37 which is effected by the control cam 35 is thus transmitted onto the workpiece 1. By a suitable amplification of the signals in the power amplifiers the control deviation is kept sufiiciently small that the manufacture tolerances are not exceeded. Very exacting control is possible because the movement of the feelers which cooperate with the control cams 25, 35 is relatively slow.
  • control cams 25 and 35 any desired connection between the movement of the workpiece and the swinging movement of the tool can be created.
  • a control cam 25 with a straight line as a controlling contour corresponds with an infinite radius for the base cam. If then the cylinder cam is to have a constant value over the entire lens surface, the control cam 35 would also have a straight line as a controlling contour because the sloped position of the tool would remain unchanged during the passage of the workpiece.
  • the base cam may have any desired form.
  • the cylinder cam can also be changed during the grinding of a lens surface.
  • the cup-shaped cutting tool a is moved during its operation so that its axis 0 carries out a swinging movement; the pivotal angle through which said tool acts during one passage is identified with a.
  • the workpiece does not carry out a rotation; however, it does provide lifting and lowering movements and a movement in horizontal direction is superposed onto these movements.
  • the workpiece and tool have the relative positions with respect to one another which are illustrated with thin full lines. Later the workpiece is lowered and moves at the same time to the left. The tool is thereupon raised. After half of the passage is completed, the parts occupy the relative positions illustrated in thick full lines. During the further operation, the workpiece moves again upwardly, whereby the tool at the same time is again raised until finally at the end of the working the parts occupy the positions illustrated in dashed lines.
  • control cams were used for the correlation of workpiece movement and tool movement.
  • different embodiments will also fall within the scope of the invention.
  • a digital control apparatus see broken line illustration in FIG. 3 which transmits coordinated impulses to a movement mechanism for the swinging movement of the one'holder and the movement along coordinates the other holder.
  • electrical movement mechanisms or combined mechanisms can also be used.
  • a grinding and polishing machine comprising: a frame; guide means mounted on said frame; first holder means comprising carriage means mounted on said guide means and adapted to move along a first path relative to said frame and quill means mounted on said carriage means for movement along a second path and in a direction perpendicular to the direction of said first path of movement of said carriage means, said first and second paths of movement defining a theoretical plane; second holder means mounted on said frame for pivotal movement above a fixed pivot axis thereon;
  • cup-shaped tool means mounted on one of said quill means and said second holder means, said cupshaped tool having a rim thereon;
  • control means for controlling the movement of said quill means and said second holder means and, consequently, said workpiece holding means and said cup-shaped tool in response to said movement of said carriage means along said first path.
  • a grinding and polishing machine according to claim 1, wherein said cup-shaped tool is mounted on said second holder means and said workpiece holding means is mounted on said quill means.
  • control means includes control cams and feelers adapted to engage said control cams.
  • control means for controlling the pivoting movement of said second holder means includes an exchangeable adjusting piece which corresponds to a certain relative position between workpiece and tool.
  • control means includes control cams for controlling said first and second holders, said control cams being connected to one of said carriage means and said frame.
  • control means includes feeler means which cooperate with said control cams, said feeler means including signal generating means for transmitting signals to amplifiers which in turn act onto adjusting members for simultaneously adjusting the relative position between said tool means and said workpiece holding means.
  • said quill means includes a longitudinally movable rod which is guided in said carriage means and which is movable perpendicularly to the direction of movement of said carriage means.
  • control means includes control cams
  • control cams are mounted on said carriage means.
  • a grinding and polishing machine wherein said rod has a piston thereon which is movable in an operating cylinder on said carriage means and is adapted to receive pressure medium on both sides thereof to control the movement thereof.
  • control means comprises a pair of relatively movable control cams and feelers, said feelers contacting said control cams and adapted to produce a signal in response to a movement of said feelers relative to said control cam, one of said feelers being coupled for controlling the swinging movement through a mechanical gearing to a pivotal shaft so that a rotary position of said pivotal shaft corresponds to a position of said one feeler.
  • a grinding and polishing machine wherein said one feeler is fixedly connected to a feeler shaft and being rotatable therewith, a windup disk mounted on said feeler shaft and a band fixedly secured to and extending between said pivotal shaft and said wind-up disk.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
US402320A 1972-10-26 1973-10-01 Machine for producing surfaces of optical lenses, for example toric surfaces Expired - Lifetime US3900971A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722252498 DE2252498C3 (de) 1972-10-26 Maschine zum Schleifen von gekrümmten, insbesondere torischen Oberflächen an optischen Linsen

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US (1) US3900971A (es)
ES (1) ES419890A1 (es)
FR (1) FR2204987A5 (es)
GB (1) GB1439393A (es)
IT (1) IT995719B (es)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4059925A (en) * 1974-06-22 1977-11-29 Dollond & Aitchison (Services) Limited Machine for forming a curved surface on a workpiece
US4114486A (en) * 1975-04-16 1978-09-19 Aspheric Associates, Ltd. Lathe for generating spherical or aspherical surfaces on workpieces, method for generating aspherical surfaces on workpieces and workpiece having aspherical surface
US4257194A (en) * 1978-04-25 1981-03-24 Essilor International "Cie Generale D'optique" Apparatus for machining, workpieces having curved surfaces, e.g. lenses
US4419846A (en) * 1979-09-20 1983-12-13 Schimitzek Guenter Apparatus for grinding optical lenses
US4817697A (en) * 1985-02-04 1989-04-04 Sumitomo Rubber Industries, Inc. Apparatus for grooving tires
US4884482A (en) * 1988-11-22 1989-12-05 Citycrown, Inc. Method and apparatus for cutting an aspheric surface on a workpiece
US4947715A (en) * 1988-11-22 1990-08-14 Citycrown, Inc. Method and apparatus for cutting an aspheric surface on a workpiece
US5181345A (en) * 1990-04-18 1993-01-26 Coburn Optical Industries, Inc. Lens grinding method and apparatus
US20050037695A1 (en) * 2000-02-03 2005-02-17 Christoph Kuebler Polishing head for a polishing machine
US20120094577A1 (en) * 2009-06-15 2012-04-19 Alexandre Gourraud Method for Machining a Surface of an Optical Lens

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2687598A1 (fr) * 1992-02-26 1993-08-27 Cmvm International Machine et procede pour generer par meulage une surface quelconque de lentille optique ou ophtalmique.

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2470021A (en) * 1944-11-20 1949-05-10 William Boston Bailey Grinding and polishing machine
US2633675A (en) * 1950-06-10 1953-04-07 American Optical Corp Surfacing machine
US2836939A (en) * 1955-03-24 1958-06-03 White Arthur Howard Machine for producing spherical surfaces
US3117396A (en) * 1961-01-17 1964-01-14 American Optical Corp Lens grinding apparatus and method
US3460928A (en) * 1967-06-09 1969-08-12 American Optical Corp Method of making lens molds
US3492764A (en) * 1967-03-28 1970-02-03 American Optical Corp Lens generating method
US3670460A (en) * 1970-06-01 1972-06-20 Senoptics Inc Tool positioning means for lens grinder
US3704554A (en) * 1971-04-26 1972-12-05 Bausch & Lomb Lens processing machine with movable workpiece spindle

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2470021A (en) * 1944-11-20 1949-05-10 William Boston Bailey Grinding and polishing machine
US2633675A (en) * 1950-06-10 1953-04-07 American Optical Corp Surfacing machine
US2836939A (en) * 1955-03-24 1958-06-03 White Arthur Howard Machine for producing spherical surfaces
US3117396A (en) * 1961-01-17 1964-01-14 American Optical Corp Lens grinding apparatus and method
US3492764A (en) * 1967-03-28 1970-02-03 American Optical Corp Lens generating method
US3460928A (en) * 1967-06-09 1969-08-12 American Optical Corp Method of making lens molds
US3670460A (en) * 1970-06-01 1972-06-20 Senoptics Inc Tool positioning means for lens grinder
US3704554A (en) * 1971-04-26 1972-12-05 Bausch & Lomb Lens processing machine with movable workpiece spindle

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4059925A (en) * 1974-06-22 1977-11-29 Dollond & Aitchison (Services) Limited Machine for forming a curved surface on a workpiece
US4114486A (en) * 1975-04-16 1978-09-19 Aspheric Associates, Ltd. Lathe for generating spherical or aspherical surfaces on workpieces, method for generating aspherical surfaces on workpieces and workpiece having aspherical surface
US4257194A (en) * 1978-04-25 1981-03-24 Essilor International "Cie Generale D'optique" Apparatus for machining, workpieces having curved surfaces, e.g. lenses
US4419846A (en) * 1979-09-20 1983-12-13 Schimitzek Guenter Apparatus for grinding optical lenses
US4817697A (en) * 1985-02-04 1989-04-04 Sumitomo Rubber Industries, Inc. Apparatus for grooving tires
US4884482A (en) * 1988-11-22 1989-12-05 Citycrown, Inc. Method and apparatus for cutting an aspheric surface on a workpiece
US4947715A (en) * 1988-11-22 1990-08-14 Citycrown, Inc. Method and apparatus for cutting an aspheric surface on a workpiece
US5181345A (en) * 1990-04-18 1993-01-26 Coburn Optical Industries, Inc. Lens grinding method and apparatus
US20050037695A1 (en) * 2000-02-03 2005-02-17 Christoph Kuebler Polishing head for a polishing machine
US20080020691A1 (en) * 2000-02-03 2008-01-24 Carl Zeiss Vision Gmbh Polishing head for a polishing machine
US7588480B2 (en) * 2000-02-03 2009-09-15 Carl Zeiss Vision Gmbh Polishing head for a polishing machine
US8011996B2 (en) 2000-02-03 2011-09-06 Carl Zeiss Vision Gmbh Polishing head for a polishing machine
US20120094577A1 (en) * 2009-06-15 2012-04-19 Alexandre Gourraud Method for Machining a Surface of an Optical Lens
US8965557B2 (en) * 2009-06-15 2015-02-24 Essilor International (Compagnie Generale D'optique) Method for machining a surface of an optical lens

Also Published As

Publication number Publication date
ES419890A1 (es) 1976-04-16
DE2252498B2 (de) 1976-12-23
DE2252498A1 (de) 1974-05-02
IT995719B (it) 1975-11-20
FR2204987A5 (es) 1974-05-24
GB1439393A (en) 1976-06-16

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