Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
  • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
  • G01M11/02—Testing optical properties
  • G01M11/0242—Testing optical properties by measuring geometrical properties or aberrations
• • 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
• • 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
  • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
• • 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
  • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
  • B24B49/02—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent
  • B24B49/04—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent involving measurement of the workpiece at the place of grinding during grinding operation
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D11/00—Producing optical elements, e.g. lenses or prisms
  • B29D11/00951—Measuring, controlling or regulating
  • B29D11/00961—Measuring, controlling or regulating using microprocessors or computers
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
  • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
• • G—PHYSICS
  • G02—OPTICS
  • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
  • G02C7/00—Optical parts
  • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
• • G—PHYSICS
  • G02—OPTICS
  • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
  • G02C7/00—Optical parts
  • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
  • G02C7/06—Lenses; Lens systems ; Methods of designing lenses bifocal; multifocal ; progressive
  • G02C7/061—Spectacle lenses with progressively varying focal power
  • G02C7/063—Shape of the progressive surface
  • G02C7/065—Properties on the principal line
• • G—PHYSICS
  • G05—CONTROLLING; REGULATING
  • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
  • G05B19/00—Program-control systems
  • G05B19/02—Program-control systems electric
  • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of program data in numerical form
  • G05B19/4097—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of program data in numerical form characterised by using design data to control NC machines, e.g. CAD/CAM
• • G—PHYSICS
  • G06—COMPUTING OR CALCULATING; COUNTING
  • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
  • G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
  • G06Q50/04—Manufacturing
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
  • Y02P90/30—Computing systems specially adapted for manufacturing

Definitions

• the invention relates to a process implemented by computer means for determining position parameters defining the relative position of a manufactured derivable surface relative to a reference surface, to a manufacturing process and to a process for controlling such manufacturing process .
• Optical lenses and in particular ophthalmic lenses, require very high quality manufacturing process in order to obtain high quality optical lenses.
• optical lenses have been manufactured by different processes such as cast molding.
• the inventors have observed that the results provided by such process may not be entirely satisfactory.
• the inventors have observed that after such analyzing process the results may comprise certain artifacts .
• a goal of the present invention is to provide such a analyzing process.
• the invention relates to a process implemented by computer means for determining position parameters defining the relative position of a manufactured derivable surface relative to a reference surface, the process comprising: a nominal surface providing step during which a nominal surface expressed in a nominal frame of reference and corresponding to the theoretical derivable surface to be manufactured with the nominal value of the position parameters defining the relative position of the nominal surface relative to the reference surface is provided,
• a measured surface providing step during which a measured surface of the manufactured derivable surface expressed in the nominal frame of reference is provided
• a composed surface determining step during which a composed surface is determined by adding the measured surface and the deformation surface
• a parameters determining step during which the position parameters and at least one deformation parameter are determined by minimizing the difference between the nominal surface and the composed surface.
• the method according to the invention allows determining the position parameters defining the relative position of the manufactured derivable surface relative to the reference surface.
• the positioning parameters are first-order factors in the quality measurements of any digital surfacing process.
• the position parameters that are determined using the process according to the invention comprise less artifact than when obtained using the method of the prior art. Furthermore, the process according to the invention allows determining at least one deformation parameter.
• the parameter determining step further comprises a zone determining step in which a zone of interest is determined in the nominal surface and the position and deformation parameters are determined by minimizing the difference between the nominal surface and the composed surface in the zone of interest; and/or
• the parameter determining step is implemented by using a damped least squares process
• the manufactured derivable surface is a surface of an ophthalmic lens
• the measured surface is determined by optical measurements;
• the manufactured derivable surface is a non-symmetric derivable surface
• the position parameters comprise at least six parameters, for example three translation coefficients and three rotation coefficients; and/or the deformation surface corresponds to a sphero-torus surface defined by a sphere parameter, a cylinder parameter and an axis parameter; and/or
• the deformation surface corresponds to a right circular cone defined by an axis parameter and an angle parameter.
• the invention relates to a process for controlling a manufacturing process, comprising the steps of the process according to the preceding claims and further comprising:
• the invention also relates to a process for controlling a lens manufacturing process comprising the steps of:
• step d) repeating regularly step a) to c) and checking the evolution of the at least one deformation parameter over time
• the evolution of at least one parameter of the manufacturing device used during the lens manufacturing process is checked over time and the evolution over time of at least one deformation parameter of the master lens is related with the evolution over time of the at least one parameter of the manufacturing device.
• the invention further relates to a manufacturing process for manufacturing a lens using a manufacturing device comprising the steps of:
• the process includes an ophthalmic progressive lens surfacing process, for example a digital surfacing process.
• the invention also relates to a computer program product for a data processing device, the computer program product comprising a set of instructions which, when loaded into the data processing device, causes the data processing device to perform at least one of the steps, for example all of the steps, of the method according to the invention.
• the present invention provides a computer-readable medium carrying one or more set of instructions of a computer program product of the invention .
• 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, or any other type of media suitable for storing electronic instructions, and capable of being coupled to a computer system bus.
• ROMs read-only memories
• RAMs random access memories
• EPROMs electrically programmable read-only memories
• EEPROMs electrically erasable and programmable read only memories
• magnetic or optical cards or any other type of media suitable for storing electronic instructions, and capable of being coupled to a computer system bus.
• the manufacturing parameters are the setting parameter of the different manufacturing devices involved in the manufacturing process.
• the process parameter includes any measurable parameters on the manufacturing devices used for the manufacturing of the lens .
• Figures la to lc illustrate the influence of the positioning parameters of a surface of an ophthalmic lens on the distribution of astigmatism of said lens
• Figures 2a to 2d illustrate the results of a prior art process for determining the difference between a nominal surface and a measured surface
• Figures 3a to 3d illustrate the results of a prior art process for determining the difference between a nominal surface and a measured surface
• Figure 4 is a flowchart of the steps comprised in a process for determining the positioning parameters according to an embodiment of the invention
• Figure 5 is a flowchart of the steps comprised in a manufacturing process according to an embodiment of the invention.
• Figure 6 is a flowchart of the steps comprised in a controlling process according to an embodiment of the invention .
• Figures la to lc illustrate the effect of an error on the positioning parameters on the astigmatism of the resulting ophthalmic lens.
• Figures la to lc are two dimensional maps of a progressive addition lens of the type Varilux® PanamicTM with a front face of 2.12 dioptres and a rear face with a sphere of -7.75 a cylinder of 2.75 and addition of 2.75.
• the two dimensional maps represent the distribution of astigmatism as perceived by the wearer.
• the back surface is translated of 2mm along the x-axis and the y-axis.
• the back surface is translated of 2mm along the x-axis and the y-axis and rotated of 5° around the a-axis .
• Figures 2 and 3 provide examples of the influence of the deformation step of the process according to the invention .
• a nominal progressive surface is compared to deformed progressive surface.
• the deformed progressive surface corresponds to the nominal progressive surface to which a spherical deformation of 0.1 dioptre was added.
• Figures 2a to 2d illustrate the features of a third surface corresponding to the difference between the nominal surface and the deformed surface obtained using a prior art process.
• Such prior art process consist in determining the position parameter that minimize the difference between the deformed surface and the nominal surface.
• the inventors have run the prior art process as if the deformed surface was a measured surface corresponding to a manufactured surface.
• the prior art process provides the position parameters of the deformed surface. By using such position parameters one can determine the features of corresponding ophthalmic lens.
• the features of the determined ophthalmic lens are represented on figure 2a to 2d.
• Figure 2a represents the power profile of the sags difference between the measured progressive lens and its nominal surface, obtained using the prior art process.
• Figure 2b represents the sphere distribution of this difference obtained using the prior art process.
• Figure 2c represents the cylinder distribution of this difference obtained using the prior art process.
• Figure 2d represents the gap in microns between the measured progressive lens and its nominal surface, obtained using the prior art process.
• the power profile represented in figure 2a should be a straight line corresponding to 0.1 diopter and the sphere and cylinder distributions should be blank since the sphere should always be equal to 0.1 diopter and the cylinder should be equal to 0.
• the prior art process results in generating differences between the nominal surface and the deformed surface that actually do not exists.
• a nominal progressive surface is compared to deformed progressive surface.
• the deformed progressive surface corresponds to the nominal progressive surface to which a progressive surface of 0.1 diopter of addition was added.
• Figures 3a to 3d illustrate the features of a third surface corresponding to the difference between the nominal surface and the deformed surface obtained using a prior art process.
• Such prior art process consist in determining the position parameter that minimize the difference between the deformed surface and the nominal surface.
• the inventors have run the prior art process as if the deformed surface was a measured surface corresponding to a manufactured surface.
• the prior art process provides the position parameters of the deformed surface. By using such position parameters one can determine the features of corresponding ophthalmic lens.
• the features of the determined ophthalmic lens are represented on figure 3a to 3d.
• Figure 3a represents the power profile of the sags difference between of the measured surface of the progressive lens and its nominal surface, obtained using the prior art process.
• Figure 3b represents the sphere distribution of this difference obtained using the prior art process.
• Figure 3c represents the cylinder distribution of this difference obtained using the prior art process.
• Figure 3d represents the gap in microns between the measured progressive lens and its nominal surface, obtained using the prior art process.
• the difference between the nominal surface and the deformation surface should be a progressive surface of 0.1D of addition.
• Figure 4 illustrated the steps of a process according to the invention.
• a process according to the invention for determining position parameters defining the relative position of a manufactured derivable surface relative to a reference surface comprises:
• the manufactured derivable surface is a surface of an optical lens.
• the invention is not limited to such type of surface.
• the manufactured surface may be a non-symmetric derivable surface.
• a nominal surface expressed in a nominal frame of reference and corresponding to the theoretical derivable surface to be manufactured with the nominal value of the position parameters defining the relative position of the nominal surface relative to the reference surface is provided.
• the positioning parameters may comprise at least six parameters, for example three translation coefficients along the axis of the nominal frame and three rotation coefficients around the axis of the nominal frame.
• a measured surface of the manufactured derivable surface expressed in the nominal frame of reference is provided.
• the manufactured derivable surface is manufactured, it is measured using optical measurements and said measured surface is expressed in the same nominal frame of reference as the nominal surface provided in the nominal surface providing step SI.
• the process according to the invention comprise a deformation surface providing step S3 during which at least one deformation surface defined by at least one deformation parameter is provided.
• one of the deformation surface may correspond to a right circular cone defined by an axis parameter and an angle parameter.
• the deformation surface providing step of the process according to the invention may comprise providing a plurality of deformation surfaces.
• the process further comprises a composed surface step S4 during which a composed surface is determined by adding the measured surface and all the different deformation surfaces.
• the position parameters defining the position of the measured surface relative to the reference surface in the nominal frame of reference and the deformation parameters defining the different deformation of the different deformation surfaces are determined.
• the parameters are determined during the parameters determining step S5 by minimizing the difference between the nominal surface and the composed surface.
• the parameters determining step S5 further comprises a zone determining step in which a zone of interest is determined in the nominal surface and the position and deformation parameters are determined by minimizing as much as possible the difference between the nominal surface and the composed surface in the zone of interest.
• the parameters determining step S5 is implemented by using a damped least squares process.
• a lens manufacturing process using a manufacturing device comprises the steps of providing 10 a lens blank, blocking 12 the lens blank using a blocking device, machining 14 one surface of the lens blank using a machining device, for example a generator or 3D coarse grinding machining device and polishing 16 the machined surface of the lens using a polisher.
• the manufacturing steps 10 to 16 are repeated n times. After n repetitions of the manufacturing steps a controlling process according to the invention is processed .
• the manufacturing process according the invention can be used to manufacture any type of lens, for example ophthalmic lens such as for example progressive additional lens .
• the lens blank provided during the providing step 10 can be a semi-finished lens blank.
• the blocking step can be processed using any blocking devices known from the man skilled in the art; such a device is disclosed for example in patent documents US 4,229,911 or WO 2006/031687.
• the manufacturing step 14 consists in generating a desired design on the unfinished surface of the lens.
• Generators are common devices known from the man skilled in the art; such a device is disclosed for example in patent documents EP 0 849 038 or US 2005/0188516.
• the polishing step 16 consists in smoothing the manufactured surface. Polishing devices are well known in the art .
• lenses can be manufactured using the manufacturing process according to the invention.
• Such a manufacturing process can be controlled by a controlling process according to the invention as illustrated on fig. 6, and comprising the steps of:
• the master lenses can be manufactured several times per day or be manufactured on a regular basis not every day.
• the master lens has a different geometrical and/or optical parameter and/or is made of a different material than the lenses to be manufactured during the manufacturing process.
• the choice of the master lens can be done so as to amplify the sensibility of certain parameter to the process parameters.
• the master lens is made of a material and has a design such as its optical parameters are more sensitive to a modification of the process parameter that the usual manufactured lenses .
• the inventors have observed a correlation between the deformation parameters that can be determined using the method according to the invention and the manufacturing parameters .
• the inventors have observed a correlation between the sphere, cylinder and axis parameters of the sphero-torus deformation surface and the way the optical lens is blocked during the manufacturing device.
• the inventors have also observed that when the deformation surface corresponds to a right circular cone defined by an axis parameter and an angle parameter, said parameters can be correlated to the positioning of the grinding tool during the manufacturing process.
• the process according to the invention allows not only to detect a defect in the manufacturing process but also thanks to the determination of the deformation parameters to identifies where in the manufacturing process a defect is starting to appear.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• Health & Medical Sciences (AREA)
• General Physics & Mathematics (AREA)
• Ophthalmology & Optometry (AREA)
• General Health & Medical Sciences (AREA)
• Manufacturing & Machinery (AREA)
• Business, Economics & Management (AREA)
• Optics & Photonics (AREA)
• Primary Health Care (AREA)
• Economics (AREA)
• Human Resources & Organizations (AREA)
• Marketing (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Strategic Management (AREA)
• Tourism & Hospitality (AREA)
• General Business, Economics & Management (AREA)
• Theoretical Computer Science (AREA)
• Analytical Chemistry (AREA)
• Geometry (AREA)
• Chemical & Material Sciences (AREA)
• Automation & Control Theory (AREA)
• Human Computer Interaction (AREA)
• Eyeglasses (AREA)
• Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)
• Jigs For Machine Tools (AREA)
• Mechanical Treatment Of Semiconductor (AREA)

Priority Applications (9)

Applications Claiming Priority (2)

Publications (1)

Family

ID=46085034

Family Applications (1)

Country Status (11)

Cited By (1)

Families Citing this family (9)

Citations (15)

Family Cites Families (5)

• 2011
  • 2011-05-13 EP EP11305581.8A patent/EP2522458B1/en active Active
• 2012
  • 2012-05-11 RU RU2013155450/02A patent/RU2013155450A/ru not_active Application Discontinuation
  • 2012-05-11 CN CN201280022607.9A patent/CN103517784B/zh active Active
  • 2012-05-11 KR KR1020137027866A patent/KR101804367B1/ko active Active
  • 2012-05-11 CA CA2833088A patent/CA2833088C/en active Active
  • 2012-05-11 BR BR112013029130-3A patent/BR112013029130B1/pt active IP Right Grant
  • 2012-05-11 US US14/116,659 patent/US9291522B2/en active Active
  • 2012-05-11 MX MX2013013222A patent/MX348443B/es active IP Right Grant
  • 2012-05-11 AU AU2012257790A patent/AU2012257790B2/en active Active
  • 2012-05-11 WO PCT/EP2012/058806 patent/WO2012156322A1/en not_active Ceased
  • 2012-05-11 JP JP2014509763A patent/JP6072006B2/ja active Active

Patent Citations (15)

Also Published As

Similar Documents

Legal Events