EP0848810A1 - Procede et dispositif de mesure des proprietes optiques de verres de lunettes au moyen d'un detecteur optique de dessins graves dans les verres de lunettes - Google Patents

Procede et dispositif de mesure des proprietes optiques de verres de lunettes au moyen d'un detecteur optique de dessins graves dans les verres de lunettes

Info

Publication number
EP0848810A1
EP0848810A1 EP97930355A EP97930355A EP0848810A1 EP 0848810 A1 EP0848810 A1 EP 0848810A1 EP 97930355 A EP97930355 A EP 97930355A EP 97930355 A EP97930355 A EP 97930355A EP 0848810 A1 EP0848810 A1 EP 0848810A1
Authority
EP
European Patent Office
Prior art keywords
spectacle lens
lens
optical
spectacle
engraving
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.)
Withdrawn
Application number
EP97930355A
Other languages
German (de)
English (en)
Inventor
Werner Reis
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.)
G Rodenstock Instrumente GmbH
Original Assignee
G Rodenstock Instrumente 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 G Rodenstock Instrumente GmbH filed Critical G Rodenstock Instrumente GmbH
Publication of EP0848810A1 publication Critical patent/EP0848810A1/fr
Withdrawn legal-status Critical Current

Links

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
    • G01M11/025—Testing optical properties by measuring geometrical properties or aberrations by determining the shape of the object to be tested
    • 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
    • B24B13/005—Blocking means, chucks or the like; Alignment devices
    • B24B13/0055—Positioning of lenses; Marking of lenses
    • 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
    • G01M11/0221—Testing optical properties by determining the optical axis or position of lenses
    • 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

Definitions

  • the invention relates to a device and a method for measuring the spherical, prismatic and cylindrical effect of a spectacle lens, with a measuring beam path directed onto the spectacle lens resting on a glass support and with a device for optically detecting spectacles engraving depicted in certain surface areas of spectacle lenses are incorporated.
  • a device and such a method are known from DE 44 14 784 A1.
  • Devices for measuring the optical properties of spectacle lenses are also referred to as apex refractive index and are described, for example, in DE 40 03 144 A1.
  • refractive index meters are used to check already manufactured spectacle lenses in order to check whether the optical effect specifications have been achieved during the processing of the spectacle lenses.
  • refractive index meters are also used to check the correct centering of spectacle lenses within spectacle frames, especially since the cylinder axes contained in the glasses and the prism reference point during the grinding-in process of the spectacle glasses, in particular with glasses with a cylindrical and prismatic effect. and for the insertion of the glass into the frame plays a very important role. If such glasses are not correctly inserted into a frame, this can lead to severe ametropia of the user.
  • a varifocals lens with spherical, cylindrical and prismatic effect which has both a long-range and a near-vision range, can be determined by the following axes and reference points that define the symmetry of the lens (see the illustration according to FIG. 2a):
  • a spectacle lens is divided by the glass horizontal G into an upper and a lower area.
  • the so-called prism reference point BTPT is located in the center of the glass horizontal G and serves to facilitate the control of prismatic effects.
  • the so-called centering cross Z is located above the prism reference point BTPT and at the same time forms the reference point for the arrangement of the glass in front of the eye on the one hand and for the correct incorporation of the glass into the spectacle frame on the other.
  • the centering cross Z is located exactly 4 millimeters above the prism reference point BTPT.
  • the distance reference point BTFT is arranged at a distance of 8 millimeters above the glass horizontal above the centering cross Z in the progressive lens shown in FIG. 2a.
  • the corresponding near reference point BTNT is generally 14 millimeters below the glass horizontal and is nasally offset in the center of the circle by about 2.5 millimeters from the distant reference point.
  • factory-made eyeglass lenses are provided with the markings shown in FIG. 2a in order to facilitate the centering process for grinding the lens into the eyeglass frame. If, however, the markings on the surface of the spectacle lens are no longer present, two diamond-shaped markings R1, R2, which are invariably incorporated into the surface contour of the spectacle lens, define the position of the glass horizontals. The markings are incorporated into the glass surface of the spectacle lens in such a way that they are virtually invisible to a user.
  • spectacle lenses from Rodenstock have further so-called micro-engravings which allow the lens type and its corresponding reference values to be reconstructed at any time. Furthermore, below the left diamond shown in FIG.
  • the addition A is given as a number, which according to DIN 58203 represents the difference between the optical effects in the near reference point BTNT and in the distant reference point BTFT.
  • a second numerical indication (46) is engraved into the spectacle lens, the first digit (4) corresponding to the characteristic number for the base curve and the second digit (6) indicating the characteristic number for the refractive index.
  • a company-specific identification can be engraved preferably at a defined location below the lens diamond R1 for easier identification of the manufacturer.
  • micro-engravings described above are generally also referred to as spectacle engraving representations and are used for the precise and rapid detection of all important sizes specifying the spectacle lens in more detail.
  • optical magnification systems are used to record the spectacles engraved with the aid of which, under visual observation, the markings for defining the glass horizontals, for example, can be marked using color dots. It is also possible to read the engraved glasses with the help of a trained eye and with a corresponding inclination of the glasses in relation to the incident light.
  • FIG. 2 is part of an arrangement (see FIG 1 of the document) for grinding at least the peripheral edge of spectacle lenses.
  • the device is arranged in the working area of a handling device that moves the spectacle lens to be processed between various workstations.
  • the detection device itself has a glass support over which a light source is arranged which illuminates the spectacle lens from above.
  • An optical detector is provided under the spectacle lens, which detects the light passing through the spectacle lens.
  • the arrangement consisting of an apex refractive index meter, the device described above and an eyeglass lens grinding machine is, on the one hand, complex to manufacture and maintain, and moreover, involves high costs due to its individual component structure.
  • carrying out the measurement of the optical properties of a spectacle lens separately from the acquisition of the spectacle engraving representations is lengthy and difficult, especially since the finding of the spectacle engraving representations is not easy without information about the peak values that can be obtained with the refractive index meter.
  • the object of the invention to provide a device with which the engraved spectacles engraved on the surface of optical lenses, in particular spectacle lenses, for further processing and later checking, for example when checking whether a spectacle lens has been correctly fitted in a spectacle frame, can be used better.
  • the unchangeable information incorporated into the glass surface should serve as reference or comparison data during and during the measurement with apex refractive index meters.
  • a method is to be specified with which the measurement of a spectacle lens can be carried out as quickly, easily and precisely as possible.
  • the idea on which the invention is based is the basic combination of a device for measuring spherical, prismatic and cylindrical action of optical lenses, in particular spectacle lenses, with a measuring beam path directed onto the spectacle lens in a manner known per se and a device for the optical detection of spectacle engraving representations, which in certain Surface areas of optical lenses are incorporated.
  • the combination according to the invention of an apex refractive index meter and a device according to the invention for the optical detection of glasses engraving representations enables a faster and more precise detection of all the values necessary for the complete determination of the optical properties of a spectacle lens.
  • apex refractive indicators have a glass support in the measuring beam path, on which the spectacle lens to be measured can be positioned. If the spectacle lens is in a defined starting position relative to the measuring beam path, which is usually based on the glass horizontal, then all optical reference points specified in the above description can be easily approached and detected.
  • the adjustment process of the spectacle lens on the glass support can be carried out precisely and quickly, in particular using the diamond engravings R1 and R2 that define the glass horizontal.
  • a device for measuring the spherical, prismatic and cylindrical effect of a spectacle lens is designed with a measuring beam path directed onto the spectacle lens resting on a glass support and with a device for the optical detection of spectacle engraving representations which are incorporated in certain surface areas of spectacle lenses, that the device for the optical detection of glasses engraving representations at least has a light source arranged above the glass support, the light of which is directed to an area with glasses engraving representations, and an optical receiving system with a light sensor, and that the measuring beam path is relative to the device for the optical detection of glasses engraving representations It is arranged that the measuring beam passes through the spectacle lens lying on the glass support and at the same time the area of the spectacle engraving representations is illuminated by the light source and can be detected by means of the optical receiving system.
  • two light sources are preferably used, one of which illuminates the spectacle engraving depiction R1, the addition value as well as the company identifier and the other the spectacle engraving depiction R2 as well as the key figures for the base curve and for the refractive index.
  • the light reflected at these two spectacle engraving display areas is directed into an imaging optics of an optical receiving system, which finally directs the two light beams to a light sensor, preferably a CCD sensor, for further evaluation.
  • the optical receiving system is arranged centrally between the two light sources, so that the optical axis of the receiving optics of the optical receiving system is oriented perpendicular to the lens plane. Due to the spatial arrangement of the areas with eyeglass engraving, the light beams coming from the light sources are directed onto the lens surface such that their beam axes each enclose an angle greater than 0 ° with the optical axis of the imaging optics of the optical receiving system.
  • the optical axis of the measuring beam of the apex refractive index is preferably arranged parallel to the optical axis of the receiving system, so that a simultaneous optical measurement of the spectacle lens is possible in addition to the detection of the spectacles engraving.
  • suitable evaluation and display times Chen for example, the measurement data determined in this way can be displayed on an LCD screen.
  • the optical detection of the diamond markings defining the glass horizontal makes it easy to center the glass within the apex refractive index.
  • optical effects in the near reference point as well as the far reference point detected with the aid of the apex refractive index can be compared by means of the spectacle engraving depicting the addition. Possible measurement errors, which result, for example, from an inaccurate adjustment of the glass relative to the measuring beam path, can be easily eliminated.
  • the illumination of the glasses engraving is preferably carried out with light-emitting diodes (LEDs) which emit in the infrared frequency range.
  • LEDs light-emitting diodes
  • a lens-shaped light spot is generated on the engraved glasses by a downstream imaging optics, which is composed of a pair of cylindrical lenses, so that they are fully illuminated by the light source.
  • the light beams reflected in this area arrive in an optical receiving system of the optical receiving system, in which they are imaged on a light-sensitive sensor, which in turn is connected to an evaluation and a display unit.
  • the apparently invisible eyeglass engraving representations can be visibly displayed on a screen with a high resolution. This makes it easy to identify the type of glass and the manufacturer of the type of glass.
  • a spectacle lens such as a varifocal lens
  • the information contained in the glasses engraving representations can be compared with the actual measured values of the optical effects in the far and near reference incun of the spectacle lens.
  • These points can also be approached exactly and quickly from a starting position, which is predetermined by the glass horizontal and the prism reference point, in particular if the spectacle lens can be detected in the x / y plane by means of displacement sensors.
  • FIG. 1 shows a schematic cross-sectional view through the device according to the invention for the optical detection of spectacle engraving
  • FIG. 2a shows the markings on a varifocal lens
  • FIG. 2b shows the engraving on a spectacle lens
  • FIG. 3 shows a schematic representation of the individual components of the combination according to the invention consisting of a lensmeter and the device for optically capturing spectacles engraved
  • FIG. 4 device for capturing spectacle lenses in the xy plane.
  • the device shown in FIG. 1 for the optical detection of engraved glasses has two light sources L1 and L2, each with an LED 1 (only shown in the left light source L1) and a socket housing 2, within which a pair of cylindrical lenses Z1 and Z2, the cylinder axes of which are each perpendicular are arranged to each other.
  • the pair of cylindrical lenses Z1 and Z2 is preferably rotatably arranged in the housing part 3 of the light source.
  • SPARE BLADE Due to the cylindrical lens arrangement, an elliptical illumination area is imaged on the spectacle lens surface 4, which is adapted to the area of the spectacle engraving representations.
  • the light beams S1 and S2 reflected on both sides of the lens surface 4 enter the optical receiving system E, which has an achromatic lens 5 and a prism wedge 6 firmly connected to the achromatic lens 5.
  • the prism wedge 6 serves to hide the intermediate area 7 between the glasses engraving B1 and B2, so that the areas of the glasses engraving can be shown enlarged.
  • a further focusing achromat 8 is provided downstream in the beam direction, which images the images of the spectacles engraving representations B1 and B2 on a CCD light sensor 9.
  • an IR filter and a pinhole can also be provided to increase the depth of field in the optical receiving system, but these are not shown in the figure.
  • the height of the achromat 5 can preferably be adjusted together with the prism wedge 6 (see double arrow), in order to be able to make corresponding focusing adjustments in this way.
  • optical axis of the optical receiving system E is perpendicular to the spectacle lens surface 4, whereas the optical axes of the lighting units L1 and L2 enclose an angle with the optical axis of the receiving system.
  • FIG. 3 shows a schematic illustration of the combination according to the invention of an apex refractive index meter with a device for optically capturing spectacles engraved.
  • REPLACEMENT BWTT (RULE 26)
  • the schematic representation of the apex refractive index consists of a lamp L of a field diaphragm F and a focusing achromat 10 which directs the measuring beam MS in parallel and which directs the measuring beam MS onto the spectacle lens surface 4.
  • the spectacle lens B rests on a glass support 11 and abuts a spectacle system 12 horizontally.
  • the optics following in the measuring beam path for evaluating the optical effects of the spectacle lens are not discussed further in this context. The relevant components are only shown to complete the beam path.
  • the optical axis of the measuring beam path MS and the optical axis of the optical receiving system E are each directed perpendicular to the glass surface 4.
  • the mutual spacing of the axes is chosen such that, with appropriate positioning of the spectacle lens relative to the measuring beam path MS, the areas of the spectacle engraving representations are also illuminated by the light sources and can be detected by the optical receiving device.
  • the illuminating beam for the eyeglass engraving areas in this exemplary embodiment is folded over a deflecting mirror 13.
  • the parallel measurement of the spectacle lens with the aid of the apex refractive index meter and the device for the optical detection of spectacle engraving representations also makes it possible to obtain an exact two-dimensional positioning of the spectacle lens on the glass support 11. Due to the clear geometric assignments of the corresponding reference points, which are described for example in Figures 2a and 2b, the glass in the x-y plane, i.e. of the glass support level can be precisely grasped and shifted in a controlled manner.
  • a measuring device for detecting the position of the spectacle is
  • An eyeglass frame 14 is pressed manually against an eyeglass support bar 12 and a nose slide 13.
  • the eyeglass frame 14, in which the glasses to be measured are already ground, is placed with the glass 4 to be measured on the glass support 11, so that the frame 14 both on the eyeglass support bar 12 and in the nasal area of the frame on the appropriately designed nose slide 13 is present.
  • the glasses are integrated in a coordinate system predetermined by the contact surfaces, so that, due to an exact path measurement along two orthogonal spatial axes, a highly precise positioning of the glasses, for example relative to the measuring beam path, is possible.
  • a possible measurement sequence takes place in such a way that the spectacle lens to be measured is first aligned along its glass horizontal, with the information of the spectacle lens engraving representations. The measuring beam is then centered in the prism reference point of the glass, from which the near and far areas of the glass can be precisely approached and measured using the exact length of the displaced paths.
  • the presentations lie in the fact that the measured values currently detected by the apex refractive index device, for example the optical effects in the near and far reference point, can be compared with the information in the engraved glasses display and in this way it can be easily ascertained whether measurement errors are possibly present.
  • a targeted positioning of the spectacle lens to be measured can be carried out, so that long searches for specific areas of the spectacle lens to be measured can be avoided in this way.

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  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)
  • Eyeglasses (AREA)

Abstract

L'invention concerne un procédé et un dispositif de mesure de l'effet sphérique, prismatique et cylindrique d'un verre de lunettes au moyen d'un faisceau de rayons de mesure orienté sur un verre de lunettes posé sur un support. L'invention se caractérise par un détecteur optique de dessins gravés dans des zones déterminées de la surface des verres (4) de lunettes. Ce détecteur comprend au moins une source de lumière située au-dessus du support du verre de lunettes et un système de réception optique (E) avec un capteur de lumière. Le faisceau de rayons de mesure (MS) est orienté par rapport au détecteur optique de dessins gravés dans le verre de lunettes dans une direction telle qu'il traverse le verre de lunettes (4) posé sur le support, et en même temps la zone des dessins gravés dans le verre de lunettes est éclairée par la source de lumière et peut être détectée par le système de réception optique (E).
EP97930355A 1996-06-28 1997-06-27 Procede et dispositif de mesure des proprietes optiques de verres de lunettes au moyen d'un detecteur optique de dessins graves dans les verres de lunettes Withdrawn EP0848810A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19626091A DE19626091A1 (de) 1996-06-28 1996-06-28 Vorrichtung zur Messung optischer Eigenschaften von optischen Linsen mit einer Einrichtung zur optischen Erfassung von Brillengravurdarstellungen
DE19626091 1996-06-28
PCT/DE1997/001347 WO1998000693A1 (fr) 1996-06-28 1997-06-27 Procede et dispositif de mesure des proprietes optiques de verres de lunettes au moyen d'un detecteur optique de dessins graves dans les verres de lunettes

Publications (1)

Publication Number Publication Date
EP0848810A1 true EP0848810A1 (fr) 1998-06-24

Family

ID=7798370

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97930355A Withdrawn EP0848810A1 (fr) 1996-06-28 1997-06-27 Procede et dispositif de mesure des proprietes optiques de verres de lunettes au moyen d'un detecteur optique de dessins graves dans les verres de lunettes

Country Status (5)

Country Link
US (1) US6088089A (fr)
EP (1) EP0848810A1 (fr)
JP (1) JP2000500239A (fr)
DE (1) DE19626091A1 (fr)
WO (1) WO1998000693A1 (fr)

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JP3939903B2 (ja) * 2000-06-22 2007-07-04 Ｈｏｙａ株式会社 眼鏡レンズの位置合わせ方法及びレイアウト・ブロック装置
US7256881B2 (en) * 2002-02-15 2007-08-14 Coopervision, Inc. Systems and methods for inspection of ophthalmic lenses
JP4103993B2 (ja) * 2003-01-09 2008-06-18 Ｈｏｙａ株式会社 累進屈折力レンズ
DE10300777A1 (de) * 2003-01-11 2004-07-22 Carl Zeiss Verfahren zur parallaxefreien Zentrierung eines optischen Elementes
FR2853734B1 (fr) * 2003-04-14 2005-05-27 Tecoptique Systeme de visualisation de marquages optiques d'un verre ophtalmique, dispositif de tamponnage et procede d'orientation de verres utilisant un tel systeme
CN102564739A (zh) * 2011-12-27 2012-07-11 中国科学院光电技术研究所 一种光焦度计
CN103063410B (zh) * 2012-12-12 2015-05-27 中国科学院西安光学精密机械研究所 紫外或可见光光学系统参数的自动检测系统及检测方法
DE102013010684B4 (de) * 2013-06-26 2021-11-18 Rodenstock Gmbh Ein Verfahren und eine Messvorrichtung zur verbesserten Erfassung von Fassungsparametern einer Brillenfassung sowie Stützscheibe
CN111397852A (zh) * 2020-02-28 2020-07-10 浙江工业大学 一种体状及微棱镜镜片的棱镜度智能检测方法

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Also Published As

Publication number Publication date
US6088089A (en) 2000-07-11
DE19626091A1 (de) 1998-01-15
JP2000500239A (ja) 2000-01-11
WO1998000693A1 (fr) 1998-01-08

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