DE102017201288A1 - Method for positioning a lens - Google Patents

Method for positioning a lens

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Publication number
DE102017201288A1
DE102017201288A1 DE102017201288.9A DE102017201288A DE102017201288A1 DE 102017201288 A1 DE102017201288 A1 DE 102017201288A1 DE 102017201288 A DE102017201288 A DE 102017201288A DE 102017201288 A1 DE102017201288 A1 DE 102017201288A1
Authority
DE
Germany
Prior art keywords
lens
surface
determined
reference point
observation axis
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
DE102017201288.9A
Other languages
German (de)
Inventor
Silvio Sperling
Thomas Dunker
Michael Schiller
Sebastian Luther
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.)
Breitfeld & Schliekert
Breitfeld and Schliekert GmbH
Original Assignee
Breitfeld & Schliekert
Breitfeld and Schliekert GmbH
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 Breitfeld & Schliekert, Breitfeld and Schliekert GmbH filed Critical Breitfeld & Schliekert
Priority to DE102017201288.9A priority Critical patent/DE102017201288A1/en
Publication of DE102017201288A1 publication Critical patent/DE102017201288A1/en
Application status is Pending legal-status Critical

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical means
    • G01B11/002Measuring arrangements characterised by the use of optical means for measuring two or more coordinates
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B13/00Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/005Blocking means, chucks or the like; Alignment devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B13/00Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/005Blocking means, chucks or the like; Alignment devices
    • B24B13/0055Positioning of lenses; Marking of lenses
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00Measuring 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
    • B24B49/12Measuring 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 involving optical means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B9/00Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/08Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
    • B24B9/14Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical means
    • G01B11/26Measuring arrangements characterised by the use of optical means for measuring angles or tapers; for testing the alignment of axes
    • G01B11/27Measuring arrangements characterised by the use of optical means for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes

Abstract

The invention relates to a method for positioning a lens (1a, 1b), in particular a spectacle lens, in a manipulation device (10), wherein the markings (4, 5, 7, 11) attached to the lens / spectacle lens along a first Observation axis (6) and from this a preliminary glass reference point (2b) is determined in which thereafter at the preliminary glass reference point a surface normal (22) or spatial orientation of the first surface or the first surface area is determined, and wherein the determined surface normal (22 ) is compared with the first observation axis (6) or the determined spatial orientation with a surface perpendicular to the observation axis.

Description

  • The invention is in the field of optics and precision engineering and is particularly suitable for use in the manufacture or processing of lenses such as spectacle lenses, in particular individual precision precision lenses, but also other spectacle lenses.
  • Known manufacturing methods for complex lenses, such as precision progressive lenses for progressive lenses, provide that prefabricated semi-finished products, so-called blanks, are processed individually in a production step. The preparation of the precursors can be done for example by machining with CNC machines or by casting, for example, a surface of the lens already completed in the pre-process and the opposite surface can be edited individually. The individual adaptation of the lenses / glasses / spectacle lenses (these terms are used in this text partially synonymous) is carried out according to the individual requirements (visual strength, visual profile) in an individualized step. The lens surface thus produced is also called a recipe surface.
  • For such a processing, it is necessary to know the position and orientation of the pre-machined glass with respect to a processing device and / or a manipulation device. If this position / orientation is known, the glass can be fixed and processed in the processing device or manipulating device.
  • Typically, upon completion of the lens / lens, it is measured with respect to dioptic values (refractive index, axis, cylinder, thickness, etc.), and permanent marks and / or stamp marks are applied to the lens / lens, the corresponding parameters of the lens (FIG. Glass reference point, passport cross, far and near circle etc.).
  • In a subsequent step, the adaptation of the glass to an individual version, in particular a spectacle frame, as well as to the biometric eye and face measurements of the wearer takes place. For this purpose, the glass must be centered suitable for installation in the socket, so that the optical center axis of the glass is aligned as possible to the pupil position and visual axis of the carrier eye. After this centering, the glass is adapted to the frame contour (in the case of frame racks) or to the position of the attachment points (in the case of frameless frames). This process is referred to as grinding in the glasses. This process requires precise positioning and orientation of the glass in or relative to a machine tool. For this purpose, the permanent / stamp marking on the glass and thus its reference coordinate system is first detected and reconstructed by means of an optical measuring device and the glass is fixed in the position defined in this way relative to the processing device.
  • In principle, methods are known from the prior art for determining the optical reference coordinate system of the lens by means of permanent and / or stamp markings, which, however, have shortcomings as soon as increased precision requirements are imposed. From the patent documents EP 1 093 907 A2 . DE 103 92 953 B4 . EP 1 762 337 A1 . US 2007/02366576 A1 . DE 44 31 880 C2 and DE 10 2007 037 730 A1 Various methods and devices for optical tag recognition and alignment are known.
  • From the EP 1 093 907 A2 a method for the determination of spectacle lenses for the production of a glass edge contour is known. A first method described there is based on the detection of the reference features of the glass, a second method uses the optical effect of the glass to determine the position. An orientation of the glass takes place only in one plane and with respect to a rotational position about an axis perpendicular to this plane.
  • From the DE 103 92 953 B4 For example, a method for positioning spectacle lenses for further processing steps is known, which provides for an alignment of the lens by translational and rotational positioning. The position and orientation of the lens is determined by a two-dimensional imaging by means of a camera using the glass mold and existing markings.
  • From the EP 1 762 337 A1 a method for the production of spectacle lenses is known in which after a first processing step markings for the reconstruction of a position information on the machined glass side are attached.
  • The US 2007/0236657 A1 describes a method for the automatic processing of spectacle lenses, in which the position of the lens is determined by measuring the optical properties. In the cited document, the correction of an alignment error is described, which, however, is done only by calculation.
  • Against the background of the prior art, the object of the present invention is to provide a method and a device by means of which positioning and alignment of a lens / spectacle lens using markers succeeds as well as possible and precisely. The task is with the features according to Claim 1 solved. The claims 2 to 15 show implementation possibilities.
  • The invention accordingly relates to a method for the spatial positioning of a lens, in particular a spectacle lens, in a manipulating device, wherein it is provided that the lens / glass is brought into a position in the region of a relative to the manipulating means by means of the manipulating device fixed first observation axis, the surface of the lens / the glass is perpendicular to this, and that on the lens / spectacle lens mounted marks along the first observation axis is optically detected and from these a glass reference point is determined.
  • Under the fact that in the area of the first observation axis defined with respect to the manipulating device, the surface of the lens / glass is perpendicular to this, each substantially perpendicular direction should be understood within the scope of the achievable accuracy. More concretely, a method for positioning a lens, in particular a spectacle lens, in a manipulating device may be provided, in which first the position of a first surface or a first surface region of the lens or of the spectacle lens with respect to the manipulating device is determined by detecting parameters of the surface in that three-dimensional positions of at least three points of a surface or a surface area of the lens are determined and, with or without knowledge of a function describing the surface, a surface shape and position is determined,
    in which thereafter by actuation of the manipulating device at least the alignment of the lens / of the spectacle lens is adjusted such that in the region of the first observing axis fixed relative to the manipulating means the surface of the lens / of the glass is perpendicular thereto and
    wherein the markings attached thereafter to the lens / spectacle lens are optically detected along the first observation axis and a glass reference point is determined therefrom,
    or
    b) optically detects markings attached to the lens / spectacle lens along the first observation axis and from this a provisional reference point is determined,
    wherein after the determination of the provisional glass reference point on this a surface normal or spatial orientation of the first surface or the first surface area is determined, and
    the determined surface normal is compared with the first observation axis or the determined spatial orientation with a surface perpendicular to the observation axis.
  • The invention is based on the recognition that inaccuracies of the position determination of the glass / lens on the one hand and inaccuracies of the determination of the orientation on the other hand influence one another and are dependent on one another. If the lens / lens is misaligned, optical marks in the form of stamp marks or permanent marks on the glass may not be detected with sufficient accuracy because of the distortions present, so that in this case also an error occurs with respect to positioning or position detection. Conversely, insufficiently accurate positioning or imperfect knowledge of the positioning of the lens may also have an impact on determining the orientation of the lens. For this reason, in a first variant, the position and orientation of the glass / lens is determined as completely as possible by measuring the glass surface on the basis of the 3D determination of surface points, aligning the glass / lens as desired, and then determining the glass reference point based on the markings. Alternatively, in a second variant of the method, on the one hand, a position / position determination is made on the basis of the determination of a preliminary glass reference point and on the other hand a surface normal or spatial orientation of the surface is determined. Thereafter, it is determined whether the determination of the preliminary glass reference point along the observation axis has been performed with sufficient accuracy perpendicular to the surface of the glass in the region of the preliminary glass reference point. For this purpose, the determined surface normal in the region of the provisional glass reference point with the first observation axis or the determined spatial orientation of the surface of the lens in the region of the provisional glass reference point is compared with a surface perpendicular to the observation axis. By this comparison, conclusions can be drawn on the quality and reliability of the position / orientation of the glass reference point on the one hand and the determination of the orientation of the first surface or the surface normal on the other hand.
  • In one embodiment of the method, it may be provided more concretely that first the position and in particular the shape of a first surface or a first surface area of the lens or the spectacle lens with respect to the manipulation device is determined by detecting parameters of the surface, and then on the lens / the marks applied to the spectacle lens are optically detected along a first observation axis and from this a provisional reference point is determined, and that thereafter at the provisional reference point a surface normal or spatial orientation of the first surface or of the first Surface area is determined, and that the determined surface normal with the first observation axis or the determined spatial orientation is compared with a perpendicular to the observation surface.
  • However, it may also be provided in a modified sequence that marks initially attached to the lens / spectacle lens are optically detected along a first observation axis and from this a preliminary glass reference point is determined and then the position and in particular the shape of a first surface or a first surface area of Lens or spectacle lens relative to the manipulating device is determined by detecting parameters of the surface, and thereafter determining a surface normal or spatial orientation of the first surface or the first surface region at the preliminary glass reference point, and the determined surface normal to the first observation axis or the determined spatial alignment is compared with a perpendicular to the observation axis surface.
  • Concretely, in a subsequent step, after the determination of the preliminary glass reference point and the surface normal or spatial orientation of the surface at the preliminary glass reference point, the surface normal or spatial orientation is compared with the orientation of the first observation axis and an angular deviation between the surface normal and the observation axis or the angular deviation of the determined spatial orientation of the surface is determined by a surface perpendicular to the observation axis.
  • If, for example, it results that the surface normal of the glass / spectacle lens / lens in the region of the provisional glass reference point coincides with the observation axis direction, the detection of position and orientation of the glass and determination of a glass reference point can be regarded as reliable and terminated. The position and orientation of the lens is then defined with respect to a processing device so that further processing can be readily accomplished.
  • A further method step may provide that, when a predefined angle deviation is undershot in the comparison, the preliminary glass reference point is defined as the final glass reference point and that, when a defined angular deviation is exceeded, the lens / spectacle lens is rotated, in particular rotated such that after rotation at the preliminary glass reference point Alignment of the surface normal of the observation axis or the spatial orientation of the surface of an axis perpendicular to the observation surface comes closer than before rotation, and thereafter a determination of another provisional glass reference point and a determination of a surface normal or the spatial orientation of the surface at the other provisional glass reference point is made.
  • This creates an iterative process which, in the case of an inaccurate determination of the position and / or orientation of the glass, provides for a targeted rotation and thereby an improvement in the orientation of the glass toward the desired state. Thereafter, a re-determination of the position and a further preliminary glass reference point of the glass is provided under now improved conditions, that is, with less distortion due to a reduced misalignment of the glass.
  • Subsequently, a further check of the orientation of the glass can be made by comparing the determined surface normal to the observation axis or by comparing the spatial orientation of the surface with a surface perpendicular to the observation axis and then decide whether further correction of the orientation of the glass by a further rotation is required or not. These iteration steps are repeated until the alignment and positioning of the glass has succeeded with satisfactory precision.
  • Various methods may be provided for determining the surface normal in the region of the preliminary glass reference point, wherein a first variant may provide that the surface normal at a point of the lens is determined from the knowledge of the surface shape and the position and orientation of the lens with respect to the manipulation device.
  • This variant assumes that an accurate detection of the lens contour has previously taken place by means of a measurement or the contour is known by a defined manufacturing process. If the lens shape is known as a function, then this can be done by measuring fewer points on the lens surface and a mathematical adaptation (fitting) with the aid of the known form.
  • A further variant may provide that the surface normal at a point of the lens is determined from the determination of the course of a light beam reflected at the lens, in particular by means of one or more groundscreens.
  • For this purpose, an exact knowledge of the shape of the lens is not necessary because the surface normal is determined experimentally. This is a Light beam, for example, a laser beam in the region of the provisional glass reference point on the surface of the lens reflected and the gradients of the input beam and the output beam are measured by inserting ground glass and observation of the light spots, which generates the light beam on the ground glass. A 3-dimensional analysis of the light spots on the ground glass gives the beam path and allows a conclusion to the surface normal at the point of the surface at which the light beam is reflected.
  • The further method may then provide that the determined surface normal with the observation axis in the determination of the provisional glass reference point compared and rotated in response to a minimum deviation, the lens and the glass reference point is determined again.
  • Specifically, it can also be provided that only the position and orientation of a first surface of the lens is determined by determining the position of a first surface or a first surface region of the lens or the spectacle lens with respect to the manipulation device by detecting parameters of the surface by 3-dimensional positions of at least 3 points of a surface or surface area of the lens are determined and a surface shape is determined with or without knowledge of a surface descriptive function.
  • For this purpose, it can further be concretely provided that the 3-dimensional position of the points is determined by observing the light scattering of a light beam, in particular a laser beam, on the lens surface, in particular by means of one or more cameras and by means of triangulation.
  • Such points on the surface of the lens can be illuminated sequentially, for example by a laser beam. However, it can also be provided that a plurality of spaced apart points on the surface of the lens in the form of a pattern illuminated simultaneously and at these points in each case the light scattering is observed.
  • An alternative method for 3-dimensional detection of the position of individual surface points of the lens / spectacle lens may provide that the 3-dimensional position of the points is determined sequentially or simultaneously by a chromatic-confocal distance measurement.
  • In the chromatic-confocal distance measurement, a dispersive optics (wave propagation is dependent on the frequency / wavelength) is used, which divides the light of a white light source into its different wavelengths and focused at different distances by means of optics on a spaced measurement object. For one of the wavelengths, the measurement object is in focus, which can be determined by means of detection of the reflected rays. From the determined wavelength can be concluded on the distance of the object point. A particular method for determining the spatial orientation of the first surface of the lens / lens in the region of a glass reference point or a preliminary glass reference point may provide that a spatial orientation of the first surface or of the first surface region is determined by the direction at the glass reference point or provisional glass reference point a defined light beam is reflected or from the location where the reflection of one or more light sources whose location is known from a camera arranged on the first observation axis is visible.
  • Thus, a defined light beam / laser beam can be directed onto the surface and the course of a reflected light beam can be determined and, based on the data on the input beam and the output beam, the orientation of the surface can be determined. However, the orientation of the surface can also be determined from an image resulting from reflection of one or more imaged light spots on the lens surface. These can be observed by means of a camera, which is oriented, for example, in the direction of the first observation axis. The location where a reflection image of a pixel or light spot appears depends on the orientation of the reflective surface, so that the orientation of the surface can be determined from the reflected image.
  • For this purpose, known luminous spots, light sources, objects, patterns or illumination patterns can be arranged in such a way that their reflection image after reflection on the lens surface becomes visible in a camera. This camera is mounted in a position and orientation with respect to the lens / lens that is known or reconstructable, for example, the camera may be mounted on the first observation axis and aligned parallel thereto.
  • A particular embodiment of this method can provide that an imaging device of a camera, in particular a lens, is arranged on the observation axis and coaxially thereto and that a defined light beam known with respect to its geometry and / or the image of a light source or a pattern known with respect to its position or object is coupled by means of a beam splitter element along the observation axis in the imaging device and / or in the direction of the lens / spectacle lens to be positioned, wherein the Coupling occurs in particular within the lens or between the lens and the lens / spectacle lens.
  • However, it can also be provided that an imaging device of a camera, in particular a lens, is arranged on the observation axis and coaxially therewith, wherein the camera reflects the reflection of one or more with respect to their position (s) and / or their spatial form and / or their luminous intensity distribution known light source (s) on the surface of the lens / spectacle lens receives and the spatial orientation of the surface is determined due to the reflected pattern.
  • The invention relates not only to a method of the type described above, but also to an apparatus for carrying out such a method, wherein the apparatus comprises a manipulating device for holding a lens / a spectacle lens and for their controlled translational and / or rotational movement, as well at least one optical observation device which allows recognition of markings on the lens / spectacle glass along a first observation axis, and a measuring device for determining the perpendicular on the surface of the lens / glass or the spatial orientation of the surface in the region of a provisional reference point.
  • In the following the invention will be shown by means of embodiments in figures of a drawing and explained below.
  • It shows
    • 1 in two figures the determination of the glass reference point for a lens with a correct (left) and a wrong (right) orientation of the lens,
    • 2 a representation of the method of determining the position of a glass / lens surface,
    • 3 a structure for glass alignment by means of selective angle measurement,
    • 4 a scheme for aligning a lens by the reflection of a spot of light;
    • 5 a glass alignment with a coaxial coupling of a light pattern in the range of a camera lens,
    • 6 a glass alignment arrangement by means of coaxial coupling of a light pattern between a camera lens and a glass / lens,
    • 7 a structure for glass alignment, wherein by means of a camera, the reflection of a light pattern source is observed on the glass / lens surface, and the
    • 8th to 11 a more detailed representation of the observation axis and the light beam guide in the case of an ideal glass orientation ( 8th and 10 ) and a non-ideal glass alignment ( 9 and 11 ). The glass reference point is here designated GBP.
  • The 1 schematically shows a typical problem that occurs in the determination of the glass reference point in spectacle lenses by means of the detection of marks on the glass of the lens. In the left part of the figure is schematically the lens 1a shown, which is already well aligned, so that the actual glass reference point 2a in focus of the camera 3 lies. The Lens 1a is thus optimally aligned. In this situation, the marker points appear 4 . 5 with a predictable, ideally equal distortion in the image of the camera 3 along the first observation axis 6 is recorded, so that from a known distribution of the markers 4,5 and the captured image of the camera 3 the location of the glass reference point 2a is recognized correctly.
  • In the right area of the 1 is the non-aligned, opposite the observation axis 6 slanted lens 1b with the marks 7 . 11 shown. The glass reference point stands on the glass of the lens 1b in the same geometric relationship to the marks 7 . 11 as with the properly aligned lens 1a the glass reference point 2a to the marks 4 . 5 , The glass reference point 2 B but it is from the camera 3 due to the distortions caused by the tilt of the lens 1b not recognized correctly, because the marks 7 . 11 by the inclination of the lens 1b and the refraction of light are shifted differently, as the markings from the camera 3 seen from the back of the lens 1b lie,
  • Hence the necessity for determining a glass reference point 2a . 2 B from the recognition of markings 4 . 5 . 7 . 11 as straight as possible alignment of the lens 1a . 1b with respect to the observation axis 6 the camera 3 to reach. Only when such an orientation of the lens 1a . 1b by turning the lens with respect to the observation axis 6 is reached, the detection of the glass reference point by means of the markings 4 . 5 . 7 . 11 reliable.
  • The 2 shows a construction with a camera 8th along an observation axis 6 on a lens 1a is directed. With 9 is called a telecentric lens. The Lens 1a is in a manner not shown with a glass holder, also Maniuliereinrichtung 10 called, connected, the defined translational and rotational movements of the lens / lens 1a allows.
  • By means of the illustrated construction, on the basis of a punctiform laser triangulation, the position and orientation of the surface of the glass front side (the side of the glass 1a the camera 8th facing) are determined. This is done by using a laser beam 12 from a laser 13 a point of the lens surface of the lens 1a illuminated and each diffuse light scattering on the glass surface through the camera 8th . 9 observed. The one in the area of the bottom of the lens 1a reflected part of the laser light 12 can be separated from the light reflected on the top of the lens. For a spatial orientation, the glass 1a with the movement system of the glass holder 10 shifted into several positions and it is determined in each case the exact 3-dimensional position of a point on the glass surface. From the individual measurements and the known relative movement between the glass 1a and the triangulation sensor coming through the camera 8th can be formed, 3D points of the glass surface are calculated. From these, a shape of the lens surface may be constructed or, if a mathematical description of the shape is known, determined by fitting.
  • As a result, the location and orientation of the glass surface of the lens 1a in relation to the first observation axis 6 and the glass holder 10 be determined exactly. In the next step, in a first variant, an optimized alignment of the glass by the manipulation device can be carried out in such a way that the surface normal of the glass in the region of the first observation axis is parallel to it. Thereafter, the glass reference point can be determined by detecting the marking points on the glass by means of the camera 8th . 9 be recognized error-free.
  • Alternatively, in another variant of the method, first markings on the lens / the glass 1a detected and this can be done using the camera 8th . 9 a preliminary glass reference point on the lens can be determined. Based on the knowledge of the lens surface, a surface normal in the region of the preliminary glass reference point can be calculated. Does this agree exactly or with a negligible deviation with the observation axis 6 The determination of the provisional glass reference point was reliable and the preliminary glass reference point can be declared as the final glass reference point.
  • If it turns out that the surface normal in the provisional glass reference point is tilted beyond the observation axis beyond an acceptable level, the glass holder / manipulation device will be used 10 rotated by rotation of the lens so that the particular surface normal as possible with the observation axis 6 comes to cover. Subsequently, a provisional glass reference point is once again determined by means of the camera 8, 9 and again a surface normal is determined at the new preliminary glass reference point, the orientation of which is again with the observation axis 6 can be adjusted. The described method converges in one or more steps to the final glass reference point.
  • The illumination of the lens surface can be done simultaneously with a line, a line grid, a dot matrix, or in general a pattern of light points instead of individual illumination points. This allows multiple 3D points to be simultaneously determined and located on the glass surface so that the shape, position and orientation of the glass surface can be calculated.
  • In the 3 a construction is shown in which the orientation of the glass 1a by measuring light rays that are reflected at the glass surface. For this purpose, in each case a laser beam 12 on the surface of the lens 1a directed and the reflected beam 15 is by means of an inserted ground glass 16 made visible by means of a light point. Another screen 17 can be a reflected beam 15 make it visible at another point, so that the on the ground glass 16 . 17 observed points of light by means of a second camera 18 observed, registered and localized. The connection of the light points allows the reconstruction of the reflected light beam 15 whose direction coincides with the direction of the incoming light beam 12 can be compared. From the direction of the incoming and the outgoing beam 12 . 15 can the orientation of the surface of the lens 1a be calculated in the region of the reflection point, without directly determining a surface normal. If the lens is moved through the glass holder between different measurements, then in this way the surface profile, that is the spatial orientation of the surface of the lens 1a be determined. Is the shape of the surface of the lens 1a determined in this way, so in principle the basis of the 2 described method for determining the final glass reference point are performed.
  • The 4 . 5 . 6 and 7 basically describe methods for aligning the glass by observing patterns of light on the glass surface by means of a camera 8th . 9 ,
  • In the 4 is shown schematically that in an ideally aligned lens 1a a point of light 19 on the first observation axis 6 is arranged by the camera 3 at the same Or at least in the same direction, at the same time its reflection on the lens surface of the lens 1a appears. This is exactly the case if the surface normal of the lens 1a with the first observation axis 6 coincides.
  • If this is not the case, as in the right area of the 4 based on the misaligned lens 1b shown, so is the image of the light spot 19 opposite the observation axis 6 moved laterally, leaving the camera 3 from the point of light 19 and its image as a reflection on the surface of the lens 1b appear shifted against each other. The shift is denoted by D in the figure in the plane of the camera image. With d is the angular deviation between the surface normal 22 on the surface of the lens 1b and the first observation axis 6 designated.
  • The 5 shows a structure in which the light beam 12 (dashed) a light spot 19 by means of a first beam splitter mirror 20a in the area of the lens 9 in the first observation axis 6 is coupled. Instead of a simple light spot, a light pattern source can also be used. The light pattern is through the semitransparent beam splitter mirror 20a by means of the camera 8th as the primary pattern of light as well as the secondary, from the surface of the lens 1a reflected patterns. If the primary and the reflected pattern are congruent, it can be concluded that the surface normal on the lens surface of the lens 1a to the observation axis 6 congruent and coaxial. If the illumination patterns fall apart, it can be concluded that the surface normal of the lens surface is opposite the first observation axis 6 is tilted and that thus the lens 1a is rotated relative to the target orientation.
  • A similar embodiment shows the 6 with the difference that a beam splitter mirror 20b not in the lens 9 is provided, but on the first observation axis 6 between the lens 9 the camera 8th and the glass surface of the lens 1a ,
  • The 7 shows an arrangement in which a light pattern source 21 outside the field of perception of the camera 8th and the lens 9 is arranged such that the reflection of the light pattern source 21 on the surface of the lens 1a by means of the camera 8th is possible. Based on the shape and position of the reflection image of the light pattern source 21 as seen through the camera 8th can be detected, the orientation of the surface of the lens 1a in the region of the reflection point or the observation axis 6 determine.
  • For example, as a light pattern source 21 a ring of lighting dots are chosen by the camera 8th or the first observation axis 6 surrounds and its reflection image through the camera 8th as one to the observation axis 6 concentric ring is perceived. Is the ring of the reflection image shifted and asymmetrical to the first observation axis 6 , so it can be concluded that the surface of the lens 1a is inclined relative to the desired position and orientation. The Lens 1a can in this case under the observation by the camera 8th be turned until the reflection of the ring 21 is concentric to the observation axis. Thereafter, the glass reference point can be determined by observing the marks.
  • Within the scope of the method according to the invention, the methods mentioned permit the determination of a glass reference point with high accuracy, even with complex individual lens surfaces. After the glass reference point is determined and the orientation of the glass is also fixed, the respective lens / the respective lens can be ground for an individual version.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
  • Cited patent literature
    • EP 1093907 A2 [0006, 0007]
    • DE 10392953 B4 [0006, 0008]
    • EP 1762337 A1 [0006, 0009]
    • US 2007/02366576 A1 [0006]
    • DE 4431880 C2 [0006]
    • DE 102007037730 A1 [0006]
    • US 2007/0236657 A1 [0010]

Claims (16)

  1. Method for the spatial positioning of a lens (1a, 1b), in particular a spectacle lens, in a manipulation device (10), wherein it is provided that the lens / glass is brought into a position by means of the manipulating device, in which in the region of Manipulation means (10) fixed first observation axis (6) the surface of the lens / glass is perpendicular to this observation axis, and that on the lens / lens attached markings (4, 5, 7, 11) along the first observation axis (6) optically detected and from these a glass reference point (2a) is determined.
  2. Method according to Claim 1 for the spatial positioning of a lens (1a, 1b), in particular a spectacle lens, in a manipulating device, which is provided in that first the position of a first surface or a first surface region of the lens (1a, 1b) or of the spectacle lens with respect to the manipulating device (10) is determined by detecting parameters of the surface by determining three-dimensional positions of at least three points of a surface or surface area of the lens, and determining, with or without knowledge of a surface descriptive function, a surface shape and position, then by actuation at least the alignment of the lens / the spectacle lens is adjusted such that in the region of a first observation axis (6) fixed relative to the manipulation device (10), the surface of the lens / lens is perpendicular thereto and subsequently on the lens / spectacle lens arm shows eighth markings (4, 5, 7, 11) along the first observation axis are optically detected and from these a glass reference point (2a) is determined, or that on the lens / spectacle lens (1a, 1b) mounted markings along the first observation axis (6) optically detected and from these a preliminary glass reference point (2b) is determined that after determining the provisional glass reference point on this a surface normal (22) or spatial orientation of the first surface or the first surface area is determined and the determined surface normal (22) with the first Observation axis (6) or the determined spatial orientation with a perpendicular to the observation axis surface is compared.
  3. Method according to Claim 1 or 2 , characterized in that first the position and in particular the shape of a first surface or a first surface area of the lens (1a, 1b) or of the spectacle lens with respect to the manipulating device (10) is determined by detecting parameters of the surface and then on the lens / the spectacle lens mounted marks (4, 5, 7, 11) along a first observation axis (6) optically detected and from these a preliminary glass reference point (2b) is determined and then at the provisional glass reference point surface normal or spatial orientation of the first surface or of the first surface area is determined and in which the determined surface normal (22) with the first observation axis (6) or the determined spatial orientation with a plane perpendicular to the first observation axis (6) surface is compared.
  4. Method according to Claim 1 or 2 , characterized in that first on the lens (1a, 1b) / the lens mounted markings (4, 5, 7, 11) along a first observation axis (6) optically detected and from these a preliminary glass reference point (2b) is determined and thereafter the position and in particular the shape of a first surface or a first surface area of the lens or of the spectacle lens relative to the manipulating device (10) is determined by detecting parameters of the surface and thereafter at the preliminary glass reference point (2b) a surface normal (22) or spatial orientation the first surface or the first surface area is determined and in which the determined surface normal (22) with the first observation axis (6) or the determined spatial orientation is compared with a surface perpendicular to the first observation axis (6).
  5. Method according to Claim 1 . 2 . 3 or 4 , characterized in that after the determination of the preliminary glass reference point (2b) and the surface normal (22) or the spatial orientation of the surface at the preliminary glass reference point, the surface normal (22) or spatial orientation is compared with the orientation of the first observation axis (6) and an angular deviation (D) between the surface normal (22) and the first observation axis (6) or the deviation of the determined spatial orientation of the surface is determined by an area perpendicular to the observation axis.
  6. Method according to Claim 5 , characterized in that when falling below a predetermined angle deviation in the comparison of the provisional glass reference point (2b) is defined as the final glass reference point (2a) and that when exceeding a predetermined angular deviation, the lens (1a, 1b) / the lens is rotated, in particular rotated such in that after rotation at the preliminary glass reference point the orientation of the Surface normal (22) of the observation axis (6) or the spatial orientation of the surface of a surface perpendicular to the observation axis comes closer than before rotation and that thereafter a determination of a further provisional glass reference point and a determination of a surface normal or the spatial orientation of the surface of the further provisional glass reference point.
  7. Method according to Claim 1 . 2 . 3 . 4 . 5 or 6 , characterized in that the surface normal (22) at a point of the lens (1a, 1b) is determined from the knowledge of the surface shape and the position and orientation of the lens (1a, 1b) with respect to the manipulation device.
  8. Method according to Claim 1 . 2 . 3 . 4 . 5 or 6 , characterized in that the surface normal (22) at a point of the lens (1a, 1b) from the determination of the course of a light beam (15) reflected on the lens, in particular by means of one or more ground glass (16, 17), is determined.
  9. Method according to Claim 7 or 8th , characterized in that the determined surface normal (22) with the first observation axis (6) in the determination of the provisional glass reference point (2a compared and rotated in response to a minimum deviation, the lens and the glass reference point is determined again.
  10. Method according to Claim 1 wherein the position of a first surface or a first surface area of the lens (1a, 1b) or of the spectacle lens relative to the manipulating device (10) is determined by detecting parameters of the surface, by three-dimensional positions of at least three points of a surface or a surface area the lens is determined and with or without knowledge of a surface descriptive function, a surface shape is determined, characterized in that the three-dimensional position of the points by observing the light scattering of a light beam (12), in particular a laser beam, at the lens surface and by triangulation is determined ,
  11. Method according to Claim 10 , characterized in that a plurality of spaced apart points on the surface of the lens in the form of a pattern simultaneously illuminated and at these points in each case the light scattering is observed.
  12. Method according to Claim 10 , characterized in that the three-dimensional position of the points is determined sequentially or simultaneously by a chromatic-confocal distance measurement.
  13. Method according to Claim 1 . 2 . 3 . 4 . 5 or 6 , characterized in that at the preliminary glass reference point (2b) a shift of the glass reference point relative to the first observation axis (6) is determined by the direction in which a defined light beam (12) is reflected, or by the location where the reflection of one or several light sources, the location of which is known from a on the observation axis (6) arranged camera (8) is visible from.
  14. Method according to Claim 13 , characterized in that on the observation axis (6) and coaxially to this an imaging device (9) of a camera (8), in particular a lens, is arranged and that a defined and known with respect to its geometry light beam (12) and / or the image a known with respect to their position light source (19, 21) is coupled by means of a beam splitter element (20a, 20b) along the observation axis in the imaging device and / or in the direction of the lens / spectacle lens to be positioned, wherein the coupling in particular within the objective or between the lens and the lens / spectacle lens takes place.
  15. Method according to Claim 13 , characterized in that on the observation axis (6) and coaxially therewith an imaging device (9) of a camera (8), in particular a lens, is arranged, wherein the camera, the reflection of one or more with respect to their position (s) and / or their spatial form and / or their luminous intensity distribution of known light source (s) (19, 21) on the surface of the lens / spectacle lens receives and due to the reflected pattern, the spatial orientation of the surface is determined.
  16. Device for carrying out a method according to one of the preceding claims, wherein the device has a manipulation device (10) for holding a lens (1a, 1b) / a spectacle lens and for its controlled translational and / or rotational movement, and at least one optical observation device (8 , 9) along a first observation axis (6) allows the recognition of markers (4, 5, 7, 11) on the lens / spectacle lens, and a measuring device for determining the perpendicular to the surface of the lens / glass or the spatial Alignment of the surface in the area of a provisional glass reference point (2b).
DE102017201288.9A 2017-01-26 2017-01-26 Method for positioning a lens Pending DE102017201288A1 (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4431880C2 (en) 1993-09-07 1997-05-07 Gerber Optical Inc An apparatus for aligning a lens blank
EP1093907A2 (en) 1999-10-18 2001-04-25 Prolaser Ltd. A method and apparatus for automatic attachment of a finishing block to a lens
WO2004062848A1 (en) * 2003-01-11 2004-07-29 Carl Zeiss Vision Gmbh Method for the parallax-free centring of an optical element and device for carrying out said method
EP1762337A1 (en) 2004-06-30 2007-03-14 Hoya Corporation Method of manufacturing spectacle lens
US20070236657A1 (en) 2004-12-03 2007-10-11 Essilor International (Compagnie Generale D' Optique) Method and a device for automatically preparing an ophthalmic lens for mounting
DE102007037730A1 (en) 2007-08-09 2009-02-19 Carl Zeiss Vision Gmbh Eyeglass lens i.e. rear surface-progressive varifocal spectacle lens, has three-dimensional position reference that is specified between set of markings e.g. mark pattern, another set of markings e.g. glass-vertical
DE10392953B4 (en) 2002-07-29 2009-12-17 Rodenstock Gmbh Device for fully automated blocking of optical lenses and fully automated method for blocking optical lenses
US20160001414A1 (en) * 2013-03-01 2016-01-07 Essilor International (Compagnie Generale D'optique) Method For Providing A Referencing Element To An Optical Lens Member

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4431880C2 (en) 1993-09-07 1997-05-07 Gerber Optical Inc An apparatus for aligning a lens blank
EP1093907A2 (en) 1999-10-18 2001-04-25 Prolaser Ltd. A method and apparatus for automatic attachment of a finishing block to a lens
DE10392953B4 (en) 2002-07-29 2009-12-17 Rodenstock Gmbh Device for fully automated blocking of optical lenses and fully automated method for blocking optical lenses
WO2004062848A1 (en) * 2003-01-11 2004-07-29 Carl Zeiss Vision Gmbh Method for the parallax-free centring of an optical element and device for carrying out said method
EP1762337A1 (en) 2004-06-30 2007-03-14 Hoya Corporation Method of manufacturing spectacle lens
US20070236657A1 (en) 2004-12-03 2007-10-11 Essilor International (Compagnie Generale D' Optique) Method and a device for automatically preparing an ophthalmic lens for mounting
DE102007037730A1 (en) 2007-08-09 2009-02-19 Carl Zeiss Vision Gmbh Eyeglass lens i.e. rear surface-progressive varifocal spectacle lens, has three-dimensional position reference that is specified between set of markings e.g. mark pattern, another set of markings e.g. glass-vertical
US20160001414A1 (en) * 2013-03-01 2016-01-07 Essilor International (Compagnie Generale D'optique) Method For Providing A Referencing Element To An Optical Lens Member

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