US20240042567A1 - Method for polishing an optical lens - Google Patents

Method for polishing an optical lens Download PDF

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Publication number
US20240042567A1
US20240042567A1 US18/264,491 US202218264491A US2024042567A1 US 20240042567 A1 US20240042567 A1 US 20240042567A1 US 202218264491 A US202218264491 A US 202218264491A US 2024042567 A1 US2024042567 A1 US 2024042567A1
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US
United States
Prior art keywords
polishing
optical lens
polishing tool
lens
edging
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
US18/264,491
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English (en)
Inventor
Luc Martin
Caroline HO
Sébastien PINAULT
Jérôme Moine
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EssilorLuxottica SA
Original Assignee
Essilor International Compagnie Generale dOptique SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Essilor International Compagnie Generale dOptique SA filed Critical Essilor International Compagnie Generale dOptique SA
Assigned to ESSILOR INTERNATIONAL reassignment ESSILOR INTERNATIONAL ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HO, Caroline, MARTIN, LUC, Moine, Jérôme, PINAULT, Sébastien
Publication of US20240042567A1 publication Critical patent/US20240042567A1/en
Pending legal-status Critical Current

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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
    • B24B13/06—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, the tool or work being controlled by information-carrying means, e.g. patterns, punched tapes, magnetic tapes
    • 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
    • B24B51/00—Arrangements for automatic control of a series of individual steps in grinding a workpiece

Definitions

  • the disclosure relates to a method of polishing a surface of an optical lens intended to be mounted in a spectacle frame. More particularly, the disclosure relates to defining a precise polishing trajectory of a polishing tool.
  • a semi-finished blank comprises an unfinished surface that is machined to perform at least an optical function.
  • a polishing tool is used to polish the surface which has been machined.
  • the surface which has been machined is integrally polished.
  • the polishing step involves removing the asperities present on the surface that has been machined.
  • the polishing step enables to provide a required transparency of the optical lens to be mounted on a spectacle lens.
  • one or multiple coating may be applied on the polished surface.
  • a coating may be applied for example to filter blue light, to provide an anti-scratch or anti-reflective function.
  • the optical lens is edged according to a shape of the spectacle frame, so as to form a final lens.
  • the edging step may be achieved by an optical lens manufacturer or an optician.
  • polishing tool provided with a polishing pad.
  • the polishing pad is brought in contact with the surface to be polished, the polishing pad polishes the surface and removes the undesired asperities.
  • This method is known as shape adaptive grinding.
  • FIG. 1 represents an unedged optical lens 10 , carried by a lens support 15 , polished by a polishing tool 16 .
  • the polishing tool 16 is more particularly a mechanical polishing tool.
  • the polishing tool 16 is provided with a polishing pad 18 to polish a surface of the unedged optical lens 10 which has been machined.
  • the lens support 15 may rotate according to a direction A around an axis X and the polishing tool may rotate according to a direction B around an axis Y.
  • the polishing tool 16 polishes the integrality of the unedged optical lens 10 machined surface.
  • the method relative to the polishing is yet not optimized and is applied on the integrality of the machined surface. This implies polishing a portion of the optical lens which will be removed during the edging step to form the final optical lens.
  • the prior art polishing process requires long period of polishing induces an important wear of the polishing pad. This results in a polishing step having a long duration, causing a need for frequent replacement of the polishing pad.
  • An aim of the present disclosure is to propose a polishing method that solves the above-mentioned problems.
  • the disclosure proposes a method of polishing a surface of an optical device intended to be mounted in a frame, wherein the method comprises:
  • the disclosure further relates to a computer program product to control a CNC machine carrying a polishing tool comprising one or more stored sequences of instructions that are accessible to a processor and which, when executed by the processor, causes the processor to carry out the steps of the method according to the disclosure.
  • the disclosure also relates to a computer-readable storage medium having a program recorded thereon; where the program makes the computer execute the method of the disclosure.
  • Embodiments of the present disclosure may include apparatuses for performing the operations herein.
  • This apparatus may be specially constructed for the desired purposes, or it may comprise a general purpose computer or Digital Signal Processor (“DSP”) selectively activated or reconfigured by a computer program stored in the computer.
  • DSP Digital Signal Processor
  • Such a computer program may be stored in a computer readable storage medium, such as, but is not limited to, any type of disk including floppy disks, optical disks, CD-ROMs, magnetic-optical disks, read-only memories (ROMs), random access memories (RAMs) electrically programmable read-only memories (EPROMs), electrically erasable and programmable read only memories (EEPROMs), magnetic or optical cards, SIM cards, or any other type of media suitable for storing electronic instructions, and capable of being coupled to a computer system bus.
  • a computer readable storage medium such as, but is not limited to, any type of disk including floppy disks, optical disks, CD-ROMs, magnetic-optical disks, read-only memories (ROMs), random access memories (RAMs) electrically programmable read-only memories (EPROMs), electrically erasable and programmable read only memories (EEPROMs), magnetic or optical cards, SIM cards, or any other type of media suitable for storing electronic instructions, and capable of being coupled to a
  • FIG. 1 is a schematic representation of an unedged optical lens and a polishing tool
  • FIG. 2 is a flowchart of a lens manufacturing steps
  • FIG. 3 is a flowchart of a lens polishing step according to the disclosure.
  • FIG. 4 is a schematic representation of machined optical lens
  • FIG. 5 is a schematic representation of a polishing trajectory according to the disclosure.
  • FIG. 6 is a flowchart of a lens polishing steps according to a particular embodiment.
  • the disclosure relates to a method for polishing a surface of an optical device intended to be mounted in a spectacle frame.
  • the optical device is a device which is intended to be brought in front of the eye of a wearer.
  • the optical device may have different forms according to the frame receiving the optical device.
  • the optical device may be an optical lens intended to face an eye of a wearer.
  • the optical device may be a pair of optical lenses, wherein each optical lens is intended to face an eye of the wearer.
  • the optical lens or the pair of optical lenses may be configured to be housed each in an opening of a spectacle frame.
  • the optical device may be a lens intended to face both eyes of the wearer.
  • the optical device may be for example ski goggles, motorcycle goggles or a motorcycle helmet visor.
  • the optical device may be formed by a pair of optical lenses or a single optical lens facing both eyes of the wear, intended to be mounted in a virtual reality device.
  • the following disclosure relates to optical lens intended to be mounted in a spectacle frame.
  • the scope of the disclosure is not limited to this aspect.
  • the disclosure applies to other types of optical devices, such as the exemplary embodiments mentioned above.
  • FIG. 2 illustrates a flowchart corresponding to a computer implemented method of polishing according to the disclosure.
  • the method of polishing according to the disclosure defines a lens polishing step S 4 , wherein the at least one surface which has been machined is polished to remove the asperities of the machined surface. More particularly, the lens polishing step S 4 comprises the following plurality of sub-steps:
  • FIG. 3 illustrates a flowchart relative to a method for manufacturing an optical lens.
  • the method for manufacturing an optical lens may comprise a polishing step S 4 according to the disclosure, as illustrated in FIG. 2 and explained above.
  • the method for manufacturing an optical lens may comprise:
  • the method for manufacturing an optical lens may also comprise an eventual coating application step S 6 , wherein one or more coating is applied on the polished surface of the optical lens.
  • FIG. 4 represents an unedged optical lens 10 .
  • the unedged optical lens 10 comprises a first surface 11 and a second surface opposed to the first surface (not shown).
  • the first surface 11 and the second surface provide, in combination an optical function.
  • the optical lens 10 is intended to be mounted in a spectacle frame.
  • the spectacle frame comprises at least one opening designed to receive an optical lens.
  • the unedged optical lens 10 following the polishing and the eventual application of one or more coatings, requires to be edged according to a contour so as to be fitted into the opening of the spectacle frame. Once edged according to an edging contour 12 , the unedged optical lens 10 forms an edged optical lens 14 .
  • the edging contour 12 is determined based on the shape of the spectacle frame, and more particularly the at least one opening intended to receive the edged optical lens 14 .
  • the edging contour 12 defines the contour of the optical lens once the unedged optical lens has been edged prior to being mounted in a spectacle frame.
  • the edging contour 12 is defined by the shape of a spectacle frame, and more particularly the at least one opening intended to receive an edged optical lens 14 and wearer parameter data.
  • Wearer parameter data may comprise wearer's wearing conditions.
  • the wearing conditions are to be understood as the position of the ophthalmic lens with relation to the eye of a wearer, for example defined by a pantoscopic angle, a Cornea to lens distance, a Pupil-cornea distance, a centre of rotation of the eye (CRE) to pupil distance, a CRE to lens distance and a wrap angle.
  • a pantoscopic angle for example defined by a pantoscopic angle, a Cornea to lens distance, a Pupil-cornea distance, a centre of rotation of the eye (CRE) to pupil distance, a CRE to lens distance and a wrap angle.
  • the Cornea to lens distance is the distance along the visual axis of the eye in the primary position (usually taken to be the horizontal) between the cornea and the back surface of the lens; for example equal to 12 mm.
  • the Pupil-cornea distance is the distance along the visual axis of the eye between its pupil and cornea; usually equal to 2 mm.
  • the CRE to pupil distance is the distance along the visual axis of the eye between its center of rotation and cornea; for example equal to 11.5 mm.
  • the CRE to lens distance is the distance along the visual axis of the eye in the primary position (usually taken to be the horizontal) between the CRE of the eye and the back surface of the lens, for example equal to 25.5 mm.
  • the pantoscopic angle is the angle in the vertical plane, at the intersection between the back surface of the lens and the visual axis of the eye in the primary position (usually taken to be the horizontal), between the normal to the back surface of the lens and the visual axis of the eye in the primary position; for example equal to ⁇ 8°.
  • the wrap angle is the angle in the horizontal plane, at the intersection between the back surface of the lens and the visual axis of the eye in the primary position (usually taken to be the horizontal), between the normal to the back surface of the lens and the visual axis of the eye in the primary position for example equal to 0°.
  • An example of standard wearer condition may be defined by a pantoscopic angle of ⁇ 8°, a Cornea to lens distance of 12 mm, a Pupil-cornea distance of 2 mm, a CRE to pupil distance of 11.5 mm, a CRE to lens distance of 25.5 mm and a wrap angle of 0°.
  • Wearer parameter data may comprise the prescription of the wearer.
  • the prescription is a set of optical characteristics of optical power, of astigmatism and, where relevant, of addition, determined by an ophthalmologist in order to correct the vision defects of an individual, for example by means of a lens positioned in front of his eye.
  • the prescription for a progressive addition lens comprises values of optical power and of astigmatism at the distance-vision point and, where appropriate, an addition value.
  • the wearer parameter data may relate to the inter-pupillary distance (IPD) which is the distance between the center of the pupils of the two eyes of the user.
  • IPD inter-pupillary distance
  • the edging contour 12 may be defined considering one of the above wearer parameter data or any combination of them
  • the edging contour 12 defines a zone within which the polishing occurs during the method of polishing according to the disclosure.
  • the polishing is limited to the zone defined by the edging contour 12 to reduce the duration of the polishing.
  • polishing tool consumable can be spared, for example less abrasive fluid is required if the polishing is accomplished by abrasive fluid, slurry, oil or the polishing pad itself if the polishing is accomplished by adaptive shape grinding.
  • FIG. 5 relates to polishing tool data defined by the trajectory 20 of a polishing tool (not shown) according to the polishing tool trajectory determination step S 4 b of the disclosure.
  • the polishing tool trajectory may be based on the edging contour 12 .
  • the polishing tool trajectory data take into consideration the edging contour 12 to limit the displacement of the polishing tool and optimize the duration of the polishing.
  • the trajectory 20 of the polishing tool may be of any form different from a spiral.
  • the trajectory 20 may have a serpentine shape, as shown in FIG. 5 .
  • the polishing tool can be brought in motion in according to any direction of the six degrees of freedom.
  • polishing tool may be mounted on an arm via a ball-and-socked joint enabling also additional rotational degrees of freedom.
  • the lens support is enabled to be brought in motion according to any direction of the six degrees of freedom.
  • the ability of the unedged optical lens 10 configured to be polished and/or the polishing tool to move enables to perform a great variety of trajectories.
  • the polishing tool trajectory 20 can be optimized in order to reduce the time necessary to polish the zone defined by the edging contour 12 , adapting the polishing trajectory 20 to the edging 12 .
  • the polishing of the unedged optical lens occurs.
  • the polishing tool trajectory 20 is provided according to step S 4 c to a CNC machine carrying the polishing tool so as to perform the polishing according to step S 4 d of the zone delimited by the edging contour 12 .
  • CNC Computerized Numerical Control It is a computerized manufacturing process in which pre-programmed software and code controls the movement of production equipment. CNC machining controls a range of complex machinery, such as grinders, lathes, and turning mills, all of which are used to cut, shape, and create different parts and prototypes.
  • a CNC machine also called Computer Numerical Control machine, is and automated machine, which is operated by a computer executing pre-programmed sequences of controlled commands.
  • a CNC machine is a machine using computer-aided design and/or computer-aided manufacturing programs to proceed to manufacturing. These programs are configured to control features like polishing tool trajectory and displacement speed of the polishing tool. Programs are written and uploaded into the machine's computer memory, as mentioned in the step S 4 c.
  • the unedged optical lens 10 configured to be polished and/or the polishing tool are configured so as to move during the polishing the zone defined by the edging contour 12 .
  • the polishing tool provides an abrasive surface on the unedged optical lens 10 .
  • the abrasive surface may be formed by the surface of a polishing pad brought into contact with the unedged optical lens 10 .
  • the contact surface between the unedged lens 10 and the polishing pad forms the abrasive surface.
  • the abrasive surface may be formed on a portion of the surface 11 within the edging contour 12 when being impacted by a laser, plasma or an abrasive liquid projected by a nozzle.
  • the polishing tool may be selected so as to provide an abrasive surface on the unedged optical lens 10 smaller or equal to 320 mm 2 .
  • providing an abrasive surface smaller or equal to 320 mm 2 enables to ensure that the polishing tool only provides polishing within the edging contour 12 .
  • the polishing tool is brought perpendicular to the surface of the unedged optical lens 10 to be polished during the polishing step S 4 d .
  • Bringing the polishing tool perpendicularly to the surface to be polished enables to perform a more precise polishing.
  • the polishing tool is a mechanical polishing tool carrying a polishing pad.
  • the polishing pad is configured to be brought in contact with the machined surface of the unedged optical lens 10 to polish the zone delimited by the edging contour 12 .
  • the abrasive surface defines a portion of the polishing pad which is the portion of the polishing pad brought in contact with the unedged optical lens 10 .
  • the wear of the polishing pad is less important.
  • the polishing pad mounted on a polishing tool can polish more optical lenses using the polishing method according to the disclosure than the conventional polishing method for an identical wear.
  • the diameter of the polishing pad may be smaller or equal to 10 mm.
  • a polishing pad of small dimension enables to provide a reduced surface of contact between the polishing tool and the unedged lens 10 . This also enables to ensure polishing only within the edging contour. More particularly, a polishing pad of small dimension enables to match the shape of the edging contour 12 and ensuring a precise polishing, only within the edging contour 12 .
  • the polishing pad may be bent, arched or curved. In such manner, the contact surface formed by the abrasive surface may be reduced and enables a more precise polishing.
  • the polishing pad being bent, arched or curved enables to provide a reduced surface of contact between the polishing tool and the unedged lens 10 and enables to ensure a polishing only within the edging contour.
  • the polishing may be point-by-point polishing.
  • the polishing pad is made of an elastic material.
  • the elastic material may be a polymer, for example covered with an abrasive material.
  • An oil may be applied on the polishing pad prior accomplishing the polishing on the unedged optical lens for not creating additional asperities during the polishing step.
  • the mechanical polishing tool comprises a non-polishing pad.
  • a slurry is used which is either applied on the non-polishing pad and/or the machined surface of the unedged lens 10 .
  • the polishing tool may comprise a nozzle projecting a jet of abrasive liquid on the surface of the unedged lens 10 to be polished.
  • the polishing tool comprises a single or a plurality of nozzles projecting abrasive liquid.
  • the projection of the abrasive liquid enables to perform polishing without requiring bringing the polishing tool in contact with the unedged lens 10 to be polished.
  • the surface of the lens encounters a high stress causing erosion and/or shearing enabling material removal.
  • the nozzle has a characteristic dimension which may be defined by the diameter of the nozzle.
  • the diameter of the nozzle is larger or equal to 0.1 mm, and preferably smaller or equal to 2 mm. In a more preferred embodiment, the diameter of the nozzle is 1 mm.
  • a nozzle having a small diameter enables to have more precision with respect to the zone to be polished.
  • the polishing is restrained solely to the zone formed by the edging contour 12 .
  • the fluid jet polishing enables a point-by-point polishing.
  • the detailed polishing performed by a polishing tool having a nozzle of small diameter enables the polishing of micro-lenses formed on the machined surface of the unedged optical lens 10 .
  • the polishing tool may comprise more than one nozzle to project simultaneously an abrasive liquid.
  • a polishing tool may comprise 2, 3, 4, 10, 12, or even 16 nozzles.
  • the multi jet polishing enables to reduce the time required to polish the zone formed by the edged contour 12 , requiring a fewer number of strokes.
  • the more than one nozzle may project simultaneously an abrasive liquid on at least two unedged optical lens to be polished.
  • the trajectories of the different nozzles of a polishing tool are different.
  • the polishing tool comprises an laser or plasma.
  • the laser or plasma affects the chemical properties of particles of unedged optical lens 10 causing erosion and/or shearing enabling material removal.
  • plasma polishing may be used to polish thermoplastic materials, for example polycarbonate.
  • FIG. 6 illustrates a flowchart regarding the polishing step comprising particularly a polishing control sub-steps.
  • the polishing method comprises a control step S 4 g to determine if the polished surface meets the polishing requirement.
  • the rugosity of the polished surface of the optical lens 10 is measured in at least one point of the zone delimited by the edged contour 12 .
  • the measured rugosity is compared to a rugosity threshold value. If the measured rugosity is more important than the threshold value.
  • a second polishing step S 4 h occurs on at least a part of the surface of the optical lens within the edging contour 12 .
  • a lens rugosity measurement step S 4 e Prior to the polishing according to the step S 4 d , a lens rugosity measurement step S 4 e , wherein a rugosity measurement is performed over at least a part of a surface of the optical lens within the edging contour 12 .
  • a rugosity comparison step S 4 f the rugosity measurement of the unedged optical lens 10 is compared with a surface of reference for an optical lens having the same optical function.
  • a zone requiring a polishing within the edging contour 12 is determined. And based on the zone requiring to be polished, the polishing tool trajectory 20 is determined.
  • This technical solution is compatible with progressive lenses and complex freeform shapes, thanks to the multi-axis nature of the equipment.
  • the amount of material removal in a specific area can be varied to adjust the amount of polishing or correct defects.
  • the disclosure also relates to a computer program product comprising one or more stored sequences of instructions.
  • the one or more sequences of instructions comprise edging contour data and polishing tool trajectory data.
  • a processor executes the sequences of instructions so as to command the polishing tool to perform polishing according to the disclosure.
  • the zone to be polished by the polishing tool is provided to the processor commanding the polishing tool.
  • the polishing trajectory data correspond to sequences of instruction to be performed by the polishing tool, to define the displacement and the trajectory 20 of the polishing tool 16 during the polishing step.
  • a support onto which is resting the unedged lens 10 , follows a trajectory in accordance to the polishing tool trajectory 20 to perform the polishing in the unedged lens 10 within the edging contour 12 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
US18/264,491 2021-02-12 2022-02-11 Method for polishing an optical lens Pending US20240042567A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP21305191 2021-02-12
EP21305191.5 2021-02-12
PCT/EP2022/053402 WO2022171810A1 (en) 2021-02-12 2022-02-11 Method for polishing an optical lens

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US20240042567A1 true US20240042567A1 (en) 2024-02-08

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US18/264,491 Pending US20240042567A1 (en) 2021-02-12 2022-02-11 Method for polishing an optical lens

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US (1) US20240042567A1 (de)
EP (1) EP4291351A1 (de)
CN (1) CN116829306A (de)
MX (1) MX2023009247A (de)
WO (1) WO2022171810A1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7118449B1 (en) * 2004-09-20 2006-10-10 Carl Zeiss Smt Ag Method of manufacturing an optical element
PL2184132T3 (pl) * 2008-11-07 2013-08-30 Essilor Int Sposób i urządzenie do wytwarzania soczewki optycznej
FR2980386B1 (fr) * 2011-09-27 2014-09-12 Visioptimum Internat Dispositif de polissage de lentilles optiques

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MX2023009247A (es) 2023-08-16
EP4291351A1 (de) 2023-12-20
CN116829306A (zh) 2023-09-29
WO2022171810A1 (en) 2022-08-18

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