WO2008009423A1

WO2008009423A1 - Device and method for determining a position of spectacle lens in relation to a spectacle frame, and computer program device

Info

Publication number: WO2008009423A1
Application number: PCT/EP2007/006337
Authority: WO
Inventors: Rainer Sessner; Dietmar Uttenweiler; Andrea Welk; Helmut Altheimer; Werner Müller
Original assignee: Rodenstock Gmbh
Priority date: 2006-07-19
Filing date: 2007-07-17
Publication date: 2008-01-24
Also published as: DE102006033490A1; EP2044482A1

Abstract

The invention relates to a device (10) for determining a position of a spectacle lens (54, 56) in relation to a spectacle frame (52). Said device comprises at least one display means (50) for displaying at least one characteristic point of the spectacle lens, at least one image capturing device (14, 16) that is designed and arranged such that image data of the at least one display means (50) and image data from at least parts of the spectacle lens (54, 56) and the spectacle frame (52) can be produced, and a data processing device that is designed to determine a position of the spectacle lens (54, 56) in relation to the spectacle frame (52), using the image data. The invention also relates to a method and to a computer program device.

Description

Apparatus and method for determining a position of a spectacle lens relative to a spectacle frame, computer program device

description

The present invention relates to a device for determining a position of a spectacle lens relative to a spectacle frame, a method for determining a position of a spectacle lens relative to a spectacle frame and a computer program device for carrying out the method.

State of the art

The introduction of individually optimized spectacle lenses makes it possible to respond to the needs of people with visual defects and to provide, for example, spectacle lenses with individually optimized viewing areas. Individually adapted spectacle lenses allow optimal correction of optical vision defects of a user of the lenses. An individual calculation and adjustment of eyeglass lenses is also possible for sports eyewear, which are characterized by large deflections, frame and pre-tilt angle.

In order to fully exploit the optical advantages of individual spectacle lenses, in particular individually adapted progressive lenses, it is necessary to calculate and manufacture these spectacles with knowledge of the position of use of the user and to wear in accordance with the position of use used for the calculation and production. The position of use is dependent on a variety of parameters, such as the pupil distance of the user, the lens angle, the spectacle lens, the spectacle frame, the corneal vertex distance of the system of glasses or spectacle lenses and eye (s) and the grinding height of the lenses. These and other parameters which are used to describe the position of use can be used, or are necessary, are in relevant standards, such as DIN EN ISO 1366, DIN 58 208, DIN EN ISO 8624 and DIN 5340 included and can be removed. Furthermore, it is necessary that the spectacle lenses are arranged in a spectacle frame in accordance with the optical parameters used for the manufacture, so that the spectacle lenses are actually carried in the position of use in accordance with the optical parameters.

To determine the individual optical parameters, the optician has a variety of measuring instruments available. For example, the optician can evaluate pupillary reflexes with a so-called pupillometer or determine the distance of the pupil centers in order to determine the pupil distance in this way.

Pretank angle and corneal vertex distance can be determined, for example, with a measuring device, in the habitual head and body posture of

Customers the meter is held to a socket level of a spectacle frame.

The pre-tilt angle can be read off the side of a gravity-driven pointer using a scale. For the determination of

Corneal Vertex Distance is an engraved ruler is used with which the distance between the estimated groove bottom of the spectacle frame and the cornea is also measured from the side.

The frame angle of the spectacle frame can be determined, for example, with a meter on which the glasses are placed. The nasal edge of a disc must be arranged above a pivot point of a movable measuring arm, wherein the other disc is parallel to an engraved line. The measuring arm is adjusted so that a marked axis of the measuring arm is parallel to the frame level of the disc arranged above it. The socket angle can then be read on a scale.

Spectacle lenses, especially progressive lenses are calculated according to a variety of parameters and it is necessary, each lens exactly in one Adjust eyeglass frame, so that each lens meets the specified optical task. After grinding a spectacle lens into a spectacle frame, therefore, the position of the spectacle lens relative to the spectacle frame is regularly checked by an optician. For this purpose, engraving points are scored again after grinding and the stamping of the centering crosses and the measuring points is reconstructed via a template. This method is conditionally practicable for spectacles with a very small frame angle. However, this procedure is very inaccurate for spectacles which have a different lens angle than 0 ° and in particular for glasses with a high lens angle.

Object of the invention

It is an object of the invention to provide a way to precisely determine a position of a spectacle lens relative to the spectacle frame in a simple manner.

This object is achieved by the device according to claim 1, the method according to claim 12 and the computer program device according to claim 17. Preferred embodiments or variants are the subject of the dependent claims.

definitions

Before the following detailed description of the invention, terms will be defined that will assist in understanding the invention.

The term "determine" in the sense of this invention includes, for example, "calculate", "read from a table", "remove from a database", etc.

The position of a spectacle lens relative to a spectacle frame includes in particular all the information necessary to indicate the arrangement of the spectacle lens relative to the spectacle frame, such as position of optically particularly relevant areas, such as near reference point or range, far reference point or range, etc., position of the centering point, astigmatism axis, etc. ,

"Characteristic points" of a spectacle lens are, for example, points which make the alignment or the arrangement of the spectacle lens unambiguously determinable. For example, characteristic points may be engraving points of the spectacle lens or reference points of the spectacle lens. In particular, two-dimensional, flat structures, such as circles, crests, etc., can be characteristic points.

"Engraving points" are in particular those points which allow a determination of the optical properties in a unique manner. For example, the relative position of near reference point, far reference point, umbilical line, etc. with respect to a centering point is known as a preferred engraving point. A spectacle lens may have one or more characteristic points, and consequently one or more characteristic points may be represented by the means of representation (s). Furthermore, engraved dots are formed so as to be transparent to the naked eye, i. without further optical aids, are essentially not visible.

For example, engraving points may include two or more product-specific micro-engravings, such as e.g. Circle (s), diamond (s), etc., be, which are arranged in particular at a standardized distance from each other, for example, at a distance of about 34 mm. These engraving points are called "main engravings". Furthermore, engraving points, in particular micro engravings, can define a glass horizontal. The center between the two engraving points is at the same time the origin of coordinates (also referred to below as "zero point") for the further measuring and reference points if stamped glass-specific markings of the spectacle lens are missing.

Immediately below the "main engravings" can each temporal the Engraving the addition and nasal an index for base curve and refractive index of the glass are located.

Further, another engraving point may be a trademark, for example in the form of a letter, etc., which may be located about 13 mm below the "main engraving" or the engraving of the addition and index of base curve and refractive index of the glass.

A "presentation means" in the sense of the invention may be, for example, a so-called saddle point, which is designed, for example, as a sticker. The

However, means of representation can also be a monochrome point, either as

Sticker can be arranged on a spectacle lens or is drawn for example with a pen directly on the spectacle lens. The presentation means can also be several

Points, circles or other and / or other geometric structures, in particular two-dimensional structures have, for example, one or more stickers in the form of saddle points and / or circles, drawn circles or points, etc ..

In particular, a presentation means may comprise three or more stickers which are arranged on one of the spectacle lenses. The presentation means can also be six

Have stickers, wherein three stickers are arranged on the one spectacle lens and three further stickers are arranged on the other spectacle lens.

In particular, a spectacle lens can have one or more characteristic points, which can be represented by one or more representation means. For example, one or more engraving points may be represented by one or more presentation means. The presentation means may be, for example, a sticker which is arranged such that the position of one or more engraving points relative to the sticker can be determined uniquely. For example, a sticker may cover two (or three) engraved dots, and at the location overlying the engraving dots, for example, the sticker may be colored, the color being different from the remaining color of the sticker. For example, the sticker may have a white base color or be transparent and at positions corresponding to the two (or three) engraving points are overlaid, the sticker may at least each have a black dot or circle or a saddle point, ie the sticker may have two (or three) black dots or circles or two (or three) saddle points.

Further, a presentation means may be one or more stamped

Markers include, e.g. two stamped circular arcs of the form "()", in the middle of which, for example, the distance reference point BF of a spectacle lens can be located. The circular arcs may be arranged such that the far reference point is about 8 mm above the zero point (see above). Two horizontal lines to the right and left of it are auxiliary markers for aligning the horizontal lights when checking the cylinder axis.

Furthermore, a stamped marking may comprise a remote centering cross, which is located about 4 mm above the zero point (see above). The remote centering is the fitting cross for the exact centering of the glass in front of the eye or the socket.

The "horizontal glases" (see above) may each comprise two horizontal broken lines temporal / nasal. Preferably, a specific product engraving in the form of one or more circles or diamonds is arranged between the lines.

In addition, a stamped marking may include a prism reference point Bp, which preferably coincides with the zero point (see above).

The stamped mark may also include a circle around the near reference point BN. The near reference point, ie the center of the circle, may be offset by about 14 mm down and about 25 mm nasally from the origin. By way of example, this is a measuring auxiliary point in order, if necessary, to be able to check the proximity at the vertex-value measuring device (also referred to as "SBM"). The real lateral offset of the near-vision point may differ depending on the variable inset. Furthermore, the stamped markings may have additional or additional markings, for example a schematic eye, in particular to mark the distance reference point, plus and minus signs, points to mark the near reference point, etc.

Two recording devices in the sense of the invention are, for example, two digital cameras, which are positioned separately from one another. It is possible for an image recording device to preferably comprise a digital camera and at least one optical deflection element or mirror, the image data of a pair of spectacles or of the partial region of a pair of spectacles being recorded or generated by means of the deflection mirror. Two image recording devices therefore include in the same way, for example, two in particular digital cameras and at least two deflection elements or mirrors, each representing a digital camera and at least one deflection mirror an image pickup device. Furthermore, two image recording devices can also consist of exactly one digital camera and two deflecting elements or mirrors, with image data being recorded or generated with a time offset by means of the digital camera. For example, image data is generated at a first point in time, wherein a pair of spectacles or a partial area of a pair of spectacles is imaged by means of the one deflecting mirror, and generates image data at a second time point, which images the spectacles or the partial area of the spectacles by means of the other deflection mirror. Furthermore, the camera can also be arranged in such a way that image data is generated by the camera at the first or the second time, wherein no deflection mirror is necessary or arranged between the camera and the spectacles.

For the purposes of this invention, dimensioning in box size is understood to mean the measuring system as described in the relevant standards, for example in DIN EN ISO 8624 and / or DIN EN ISO 1366 DIN and / or DIN 58 208 and / or DIN 5340, is described. Further, with regard to the case size and other conventional terms and parameters used, the book "The Optics of the Eye and the Visual Aids" by Dr. Ing. Roland Enders, 1995 Optical Fachveröffentlichung GmbH, Heidelberg, and the book "Optics and Technology of the Glasses" by Heinz Diepes and Ralf Blendowske, 2002 Publisher Optical Publications GmbH, Heidelberg, referenced. Likewise, reference is also made to the brochure "Inform expert consultation for the optics" PR series of ZVA for the optician, Issue 9, "Brillenzentrierung", ISBN 3-922269-23-0, 1998, in which the Kastenmaß particular in Figures 5 and 6 is shown by way of example. Furthermore, reference is also made to the book "Eyewear Adaptation A Textbook and Guideline" by Wolfgang Schulz and Johannes Eber 1997, DOZ-Verlag, published by the Zentralverband der Augenoptiker, Dusseldorf, ISBN 3-922269-21-4, in particular points 1.3, 1.4. and 1.5 and the accompanying figures. The standards, the said booklet and the said books constitute an integral part of the disclosure of the present application for the definitions of terms.

The limitation on dimensioning in box size includes, for example

Sampling points for an eye or both eyes, which are farthest out or inside and / or up or down. These detection points are conventionally determined by tangents to the spectacle frame or the respective areas of the spectacle frame assigned to the respective eyes (compare DIN 58 208, Figure 3).

In particular, the box dimension is a rectangle in the pane plane circumscribing a spectacle lens. According to the above-mentioned standards, to determine the slice plane, it is assumed mathematically from a plane with the normal vector of the cross-product of center-parallel / -horizontal of the box. As an approximation, the slice plane normal can be determined from the cross product of the vector between the nasal point and the temporal point and the vector between the top and bottom points of the rim of the glass. Advantageously, the pretilt and the mounting disk angle best correspond to the view through situation here.

The "breakpoint" for the slice level is approximated as follows: The starting point is the middle of the vector between the upper and the lower point. It is then followed horizontally along the vector between the nasal point and the temporal point in the center of the slice (approximated by the x coordinate). The cross product of the vector between the centers of the slice planes of both sides and the mean of the two vectors of upper and lower frame points determines the normal of the frame plane. Breakpoint is one of the disk centers.

The box dimension is determined as a vertical projection of the disc edge on the disc plane. The frame angle can now be determined even for each side as the angle between the respective disc plane and the socket level.

In other words, the normal of the slice plane from the cross product of the vector between the nasal and the temporal intersection of a horizontal plane through the straight line of the zero direction with the respective edge of the glass to the frame and the vector between the upper and the lower intersection of a vertical plane through the Just zero sight direction with the respective edge of the glass to determine the version.

For the purposes of this invention, effective optical axes of the image recording devices are those regions of lines which emanate from the center of the respective apertures of the image recording devices perpendicular to these apertures and intersect the imaged partial region of the spectacles. In other words, the effective optical axes are, in particular, the optical axes of the image recording devices, these optical axes being conventionally arranged perpendicular to a lens system of the image recording devices and starting from the center of the lens system. If there are no further optical elements in the beam path of the image recording devices, such as deflecting mirrors or prisms, the effective optical axis essentially corresponds to the optical axis of the image recording device. However, in the beam path of the image pickup device arranged further optical elements, for example, one or more deflection mirrors, the effective optical axis no longer corresponds to the optical axis of the image pickup device, as emanating from the image pickup device.

In other words, the effective optical axis in the sense of this invention is that region of an optionally multiply optically deflected optical axis of an image recording device, which cuts the spectacles without changing the direction. The optical axis of the image pickup device corresponds to a line extending from a center of an aperture of the image pickup device at a right angle to a plane including the aperture of the image pickup device, wherein the optical axis direction of the image pickup device is controlled by optical elements such as mirrors and / or prisms, is changeable.

The term "nearly cut" in the sense of this invention means that the effective optical axes have a minimum distance of less than about 10 cm, preferably less than about 5 cm, more preferably less than about 1 cm. Cutting at least almost means therefore that the effective axes intersect or almost intersect.

A pattern projection device in the sense of the present invention is, for example, a conventional projector such as, for example, a commercially available projector. The projected pattern data is, for example, a stripe pattern or a binary sine pattern. The pattern data is projected onto at least a portion of the glasses and image data is generated therefrom by means of the image recording device. From the thus illuminated portion of the glasses image data are generated at a triangulation angle of the image pickup device. The triangulation angle corresponds to the angle between an effective optical axis of the image pickup device and a projection angle of the pattern projection device. Height differences of the portion of the glasses correspond to lateral displacements, for example, the strips of the Stripe pattern as preferred pattern data. Preferably, in the phase-measuring Triangualtion the so-called phase-shift method is used, wherein on the partial region of the glasses, a periodic, in the intensity distribution approximately sinusoidal wave pattern is projected and the wave pattern moves gradually in the projector. During the movement of the wave pattern, preferably at least three times image data are generated from the intensity distribution (and the partial area of the glasses) during a period. The intensity distribution can be deduced from the generated image data and a phase angle of the pixels relative to one another can be determined, wherein points on the surface of the partial region of the spectacles are assigned to a specific phase position corresponding to their distance from the image recording device. Furthermore, reference is made to the approval work entitled "Phase-Measuring Deflectometry (PMD) - A High-Precision Method for Measuring Surfaces" by Rainer Seßner, March 2000, which represents an integral part of the disclosure of this application for further definitions of terms.

For the purposes of the present invention, two different picking directions mean that different image data are generated from overlapping partial regions of the spectacles, preferably one and the same partial region of the spectacles, in particular that image data of identical partial regions of the spectacles are generated under different perspective views. Consequently, although the same portion of the glasses is displayed, the image data is different. Different recording directions can also be achieved, for example, by generating the image data from at least two image recording devices, wherein effective optical axes of the at least two image recording devices are not parallel. Apparatus according to one aspect of the invention according to independent claim 1

One aspect of the present invention relates to an apparatus for determining a position of a spectacle lens relative to a spectacle frame

at least one representation means for representing at least one characteristic point of the spectacle lens,

- At least one image pickup device, which is designed and arranged to generate image data of the display means and at least of partial areas of the spectacle lens and the spectacle frame and

a data processing device which is designed to determine a position of a spectacle lens relative to the spectacle frame on the basis of the image data.

Advantageously, the position of a spectacle lens relative to the spectacle frame can be determined. However, it is also possible in each case to determine the position of the two spectacle lenses relative to the spectacle frame.

Further advantageously, the position of any spectacle lenses, such as mirrored, tinted or polarized lenses can be determined.

Preferred embodiments of the invention, in particular according to the dependent claims

Preferably, the data processing device is designed to determine the position of the spectacle lens relative to the spectacle frame on the basis of the image data of at least one image recording device and on the basis of additional data. For example, additional data may include the corneal vertex distance, the socket disc angle, the head rotation or posture, the prescription of the lens (referred to as a short pre-tilt), and so on. In particular, based on the image recording device, a substantially frontal image of the face with spectacles arranged thereon or a subregion of the spectacles can be made and, in addition, as additional data, corneal vertex distance and / or frame disc angle and / or pretilt of the spectacles and / or head rotation or posture, etc. be specified. Thus, three-dimensional data of the spectacles, in particular of at least a portion of the spectacle frame and at least a portion of a spectacle lens arranged thereon can be generated on the basis of the essentially frontal image and on the additional data and thus the position of a spectacle lens (or at least a portion of the spectacle lens) relative to the spectacle frame (or at least a portion of the spectacle frame) are determined in three-dimensional space. This can apply to one or both lenses. The additional data can in this case be entered manually or supplied automatically, for example taken from a database.

The apparatus preferably has at least one second image recording device, wherein the at least two image recording devices are designed and arranged to respectively generate image data of the at least one imaging means and at least partial regions of the spectacle lens and the spectacle frame under at least two receiving directions.

Advantageously, three-dimensional data of the spectacles or of partial regions of the spectacles, in particular of at least partial regions of the spectacle frame and at least partial regions of the spectacle lens arranged thereon, are preferably generated with the aid of the present device. In particular, the position of at least one partial region of one or both spectacle lenses relative to at least one partial region of the spectacle frame or the entire spectacle frame can be determined. The three-dimensional data is determined by means of the image data. The image data, which by means of a first Imaging device are generated, different from the image data, which are generated by a second image pickup device. The differences in the image data arise in particular in that the two image recording devices are preferably arranged at different positions. Due to the preferably different positions of the at least two image recording devices, the respective image data are generated under different perspective views of the spectacles or of the partial region of the spectacles. Based on the different perspective views or the different image data of the spectacles or partial region of the spectacles generated thereby, coordinates in three-dimensional space can be determined for predetermined or predeterminable points of the spectacles, knowing the positions of the cameras relative to one another.

Advantageously, parallax errors, as can occur in conventional measuring methods, for example with a pupillary distance measuring rod, are therefore avoided.

Preferably, the data processing device is designed to use the image data to determine the position of the at least one characteristic point of the spectacle lens in the reference system of the box dimension of the spectacle lens.

The data processing device is particularly preferably designed to determine actual centering data of the spectacle lens relative to the spectacle frame on the basis of the image data, in particular the position of the characteristic point of the spectacle lens in the reference system of the box dimension of the spectacle lens.

Actual centering data are the centering data, measured with the device, of the spectacle lens arranged in the spectacles or the spectacle frame.

In other words, the data processing device makes it possible to determine the position, for example, of the centering points or reference points in the box dimension of the spectacle lens. In particular, the actual centering data becomes determined by the correlation of the or the presentation means (s) with the engraving or reference points or the glass center to box size. In particular, the position of the spectacle lens in the frame of reference of the spectacle lens can be determined by means of the data processing device on the basis of the image data. In other words, the data processing device can be designed to determine the position of the characteristic point or the characteristic points, ie, for example, of the engraving point (s) or the centering points in box size. Based on the known position of the at least one engraving point relative to the at least one centering point, the position of the centering point can be determined in box size.

Furthermore, the at least one presentation means is preferably designed to represent at least one engraving point of the spectacle lens.

Engraving points are, as stated above, regularly arranged on the lens such that they are without further aids, i. with the unaided eye are not visible. Consequently, engraving points are not or only poorly imaged by an image pickup device. On the basis of the means of representation, which may for example be a monochrome or multicolored sticker, it is possible to represent a engraving point. Alternatively, the engraving point can also be represented by a marked marking, for example a point or a cross. In particular, instead of a sticker this label can be attached with a suitable pen. Furthermore, one or more imaging means may be arranged both in color on the spectacle lens, for example by manual recording and / or by automatic marking, and one or more decals may be arranged on the lens.

Particularly preferably, the at least one display means is designed to represent 2, 3 or more engraving points.

The data processing device is particularly preferably designed to allow a deviation of the specific, actual centering data from predetermined, to determine theoretical centering data, wherein the predetermined theoretical centering data are those centering data, based on which the spectacle lens has been arranged in the spectacle frame. That is, the theoretical Zentrierdaten represent the default for grinding the lens.

In other words, the spectacle lens is manufactured in accordance with predefined parameters and ground into the socket in accordance with predetermined, theoretical centering data. The actual position of the lens in the socket may differ from the theoretically desired position. The data processing device is preferably designed to detect such a deviation.

Preferably, the apparatus comprises a data output device which is designed to output the determined, actual centering data and / or the predetermined, theoretical centering data and / or the deviation of the determined, actual centering data from the predetermined, theoretical centering data.

More preferably, the at least one presentation means comprises at least one sticker, in particular in the form of a saddle point or a plurality of saddle points.

Preferably, the device is designed to determine the position of each spectacle lens relative to the spectacle frame.

Furthermore, image data of largely overlapping subareas, in particular of the same subarea of the spectacles, are furthermore preferably imaged by the two image recording devices.

The data processing device is preferably a computer or microprocessor.

+ Further preferably, the image pickup devices are designed in this way and arranged that in the generated image data at least a display means and a spectacle frame edge and / or a lens edge is imaged.

In other words, a two-dimensional image of at least a partial region of the spectacles is generated by each image recording device. Each of the illustrations includes one or more presentation means. For example, image data generated by an image pickup device may include only a presentation means. On the other hand, image data which is generated by a further image recording device contains several presentation means. In any case, at least one display means is imaged in all the image data used for the further evaluation and at least one spectacle-edge and / or spectacle-lens edge is imaged, the same depiction means being used in all of these image data. In particular, both spectacle lenses and the imaging means arranged on the spectacle lenses are imaged.

+ Furthermore, preferably in the operating position the

Image pickup devices are arranged within a space area which is surrounded by a cone with a predetermined opening angle, wherein the cone tip of the cone is arranged in an environment of a predetermined reference point and the cone axis is arranged parallel to a predetermined direction. In operation, the predetermined direction may be equal to a horizontal direction in the reference frame of the earth, or a direction parallel to a connecting line of an entrance aperture of the image pickup device and the center of gravity of the positioned eyeglasses to be imaged.

In other words, the image pickup devices are preferably arranged in a cone volume. The tip of the cone is located at a distance of less than about 20 cm, preferably less than about 10 cm, preferably about 0 cm from the reference point.

+ According to another preferred embodiment of the present invention Invention is the opening angle of the cone less than 90 °, more preferably between about 60 ° and about 10 °, more preferably between about 45 ° and about 20 °, in particular about 30 °. The opening angle here corresponds to the angle between the axis of symmetry of the cone and the lateral surface of the cone, wherein the cone is rotationally symmetrical. In other words, the cone volume can be described by rotation of a right-angled triangle, with the triangle rotating about a catheter and the lateral surface of the cone being described by means of the rotation of the hypothenuse of the right-angled triangle. The opening angle of the cone corresponds to the angle between the hypotenuse and the axis of rotation, ie the said right angle triangle.

+ Further preferably, effective optical axes of the image pickup devices intersect at least almost, with an intersection angle between about 60 ° and about 10 °, preferably between about 45 ° and about 20 °, more preferably about 30 °.

+ In a further preferred embodiment of the present invention, the effective optical axis of at least one of the image pickup devices is arranged substantially parallel to a horizontal direction in the reference frame of the earth.

In a further preferred embodiment, at least one of the image recording devices is arranged in the operating position such that its effective optical axis is arranged substantially symmetrically with respect to the spectacle lenses of the spectacles. Arranged symmetrically with respect to the spectacle lenses means in the sense of this invention that each point on the effective optical axis has the same distance to the two spectacle lenses. In other words, the effective optical axis lies in a plane which is perpendicular to a connecting path of the center points of the two spectacle lenses and bisects this connection section.

+ Preferably, the effective optical axes of the at least two intersect Imaging devices almost. In particular, the effective optical axes of the at least two image pickup devices are arranged such that a location of minimum distance between the two effective optical axes of both eyeglass lenses of the glasses is equidistant. In particular, a location corresponds to a minimum distance of the effective optical axes to the center of the bridge of the spectacles or the spectacle frame. In other words, the effective optical axes intersect at least almost, with the intersection of the effective optical axes or the point with minimum distance from the effective optical axes arranged symmetrically with respect to the spectacle lenses of the spectacles, preferably corresponding to the center point of the bridge of the spectacles.

+ Further preferably, projections of the effective optical axes of the at least two imaging devices intersect at a horizontal plane in the frame of reference of the earth at a cutting angle which is between about 10 ° and about 60 °, preferably between about 15 ° and about 40 °, most preferably about 23, 5 °.

In another preferred embodiment of the present invention, projections of the effective optical axis of the at least two imaging devices intersect at a vertical plane in the frame of reference of the earth at a cutting angle which is between about 10 ° and about 60 °, preferably between about 15 ° and about 40 ° , more preferably about 23.5 °.

In a further preferred embodiment of the present invention, the data processing device is designed such that the positions in the image data can be assigned by a person. For example, limits of at least one spectacle lens can be assigned to a dimension in the box dimension of a person.

In a further preferred embodiment, the data processing device is designed to automatically allocate at least a part of the positions in the two-dimensional space of the image data. For example In the two-dimensional space of the image data, the positions of the presentation means can be automatically assigned or determined.

Preferably, the at least two image recording devices are designed to generate image data at the same time, with the image recording devices particularly preferably simultaneously generating image data from both spectacle lenses.

In particular, by means of the data processing device based on the plurality of image data, a viewing behavior of the user can be determined. Particularly preferably, the image data can be generated in a very rapid time sequence by means of the image recording devices, so that the data processing device can determine a substantially continuous viewing behavior of the user.

Preferably, the device comprises

at least one pattern projection device, which is designed and arranged to project predetermined pattern data onto at least partial regions of the spectacle lens and the spectacle frame.

Preferably, the device comprises exactly one image recording device and exactly one pattern projection device, whereby according to this preferred embodiment of the invention, analogously to the preceding embodiments of the invention, based on the image data advantageously three-dimensional data of the spectacles or a portion of the spectacles are generated. The three-dimensional data can advantageously be generated on the basis of image data of only one image recording device. Preferably, the three-dimensional data is generated by means of the principle of phase-measuring triangulation. In this case, the spectacles or the partial region of the spectacles are superimposed with pattern data or projected thereon by means of the pattern projection device. The image recording device generates image data of the at least partial region of the spectacles in the two-dimensional space. A surface structure of the portion of the glasses, ie, the coordinates in the third dimension, is generated by phase information of the projected pattern data indirectly via intensity patterns.

Thus, according to this preferred embodiment of the present invention, three-dimensional data of the glasses can be generated. Based on the three-dimensional data of the spectacles, the position of a spectacle lens or both spectacle lenses relative to the spectacle frame can be determined analogously to the preceding preferred embodiments of the invention, wherein only one image recording device is used.

Method according to one aspect of the invention according to independent claim 12

According to another aspect of the present invention, a method for determining a position of a spectacle lens relative to a spectacle frame comprises the steps of:

- Representing at least one characteristic point of the spectacle lens by means of at least one display means;

Generating image data of the at least one display means and at least partial areas of the spectacle lens and the spectacle frame under at least two receiving directions and

Determining a position of a spectacle lens relative to the spectacle frame based on the image data. Preferred Ausführunqsvarianten the invention, in particular according to the dependent claims

Preferably, due to the image data, in particular the position of the at least one presentation means, actual centering data of the spectacle lens relative to the spectacle frame are determined.

Preferably, at least one engraving point of the spectacle lens is represented by means of the or at least one presentation means.

Preferably, a deviation of the determined, actual centering data from predetermined, theoretical centering data is determined, wherein the predetermined, theoretical centering data are those centering data on the basis of which the spectacle lens was arranged in the spectacle frame.

The particular, actual centering data and / or the predefined, theoretical centering data and / or the deviation of the specific, actual centering data from the predefined, theoretical centering data are particularly preferably output by means of a data output device.

In a preferred embodiment of the method of the present invention, at least one presentation means is completely imaged in the generated image data.

+ Furthermore, preferably at least one display means and a spectacle-detecting edge and / or a spectacle-lens edge are imaged in the generated image data. Computer program device according to one aspect of the invention according to claim 17

According to a further aspect of the present invention there is provided a computer program device having program parts which, when loaded in and executed by a computer, are suitable for carrying out the method according to the invention.

Analogously, the above statements apply analogously to all aspects of the present invention.

Description of preferred embodiments with reference to figures

The invention will be described by way of example with reference to accompanying figures. It shows:

Figure 1 is a perspective schematic view of a preferred embodiment of the apparatus of the present invention in a preferred operating position;

Figure 2 is a schematic sectional view in plan view of an arrangement of

Image recording devices according to FIG. 1 in a preferred embodiment

Operating position;

Figure 3 is a schematic sectional view from the side of an arrangement of

Image recording devices according to FIG. 1 in a preferred embodiment

Operating position;

Figure 4 is a schematic sectional view in plan view of another preferred embodiment of the present invention in a preferred operating position; Figure 5: an exemplary means of representation in the form of a saddle point;

FIG. 6 is a schematic view of exemplary image data;

FIG. 7 is a schematic view of exemplary image data;

FIG. 8 shows a conventional device for determining engraving points.

FIG. 1 shows a schematic perspective view of a device 10 according to a preferred embodiment of the present invention. Such a device can be used to easily represent the position of a spectacle lens relative to a spectacle frame. The device 10 comprises an arrangement device in the form of a housing or a pillar 12, on which a first image recording device in the form of an upper camera 14 and a second image recording device in the form of a lateral camera 16 is arranged. Furthermore, a data output device in the form of a monitor 18 is integrated into the column 12. The upper camera 14 is preferably located in the interior of the column 12, for example as shown in Figure 1, at least partially at the same height as the monitor 18. In the operating position, the upper camera 14, and the lateral camera 16 are arranged so that an effective optical axis 20 of the upper camera 14 with an effective optical axis 22 of the lateral camera 16 at an intersection point 24 intersect. The intersection 24 of the effective optical axes 20, 22 is preferably the center of the bridge (not shown) of a pair of spectacles 38.

The upper camera 14 is preferably arranged centrally behind a partially transparent mirror 26. The image data of the upper camera 14 are generated by the partially transmissive mirror 26 therethrough. The image data (hereinafter referred to as images) of the upper camera 14 and the lateral camera 16 are preferably output to the monitor 18. Furthermore, 10 10 three illuminants 28 are arranged on the column 12 of the device. The bulbs 28 may be For example, to glow sticks, such as fluorescent tubes act. However, the lighting means 28 may also each include one or more bulbs, halogen lamps, light-emitting diodes, etc.

In the preferred embodiment of the apparatus 10 of the present invention shown in Figure 1, the effective optical axis 20 of the upper camera 14 is parallel to the horizontal direction in the reference frame of the earth. The lateral camera 16 is arranged such that the effective optical axis 22 of the lateral camera 16 intersects the effective optical axis 20 of the upper camera 14 at an intersection 24 at an intersection angle of approximately 30 °. The intersection 24 of the effective optical axes 20, 22 is preferably the center of the bridge of the spectacles 38. The intersection angle of 30 ° is a preferred intersection angle. There are also other cutting angles possible. Preferably, however, the cutting angle is less than about 60 °.

Furthermore, it is not necessary that the effective optical axes 20, 22 intersect. Rather, it is also possible that the minimum distance of the effective optical axes from the center of the bridge of the glasses, for example, less than approximately 10 cm. Furthermore, it is possible for another lateral camera (not shown) to be arranged on the pillar 12, wherein the further lateral camera is, for example, at an angle to the lateral camera 16.

In a further preferred embodiment, the upper camera 14 and the lateral camera 16 may be arranged such that their positions, and in particular their effective optical axes, may for example be adapted to the size of the user 30. The determination of the relative positions of the cameras 14, 16 to each other can be made by means of a known calibration method.

It is not necessary for the user to wear the spectacles 38 for determining the position of the spectacle lens relative to the spectacle frame on the head. Rather, the Position of the lens relative to the spectacle frame also be determined independently of the user 30. For example, the glasses 38 may be stored on a shelf, such as a table (not shown). According to the invention, the device can therefore also be designed differently, for example, have a different dimension. In particular, the device may also be smaller than shown in FIG. For example, the device may only have the two cameras 14, 16, which may be arranged substantially stationary relative to one another. The cameras are designed to be connected to a computer, so that a data exchange between the cameras 14, 16 and the computer is possible. For example, the device can also be designed to be mobile. In other words, the image recording devices, ie the cameras 14, 16, may be arranged separately from the data processing device, ie the computer, in particular housed in separate housings.

It is also possible that the glasses are worn by someone other than the actual user.

According to an exemplary operating position, the user is preferably positioned so that his gaze is directed to the partially transmissive mirror 26, the user looking at the image of his nose root (see Figure 2) in the mirror image of the partially transmissive mirror 26.

The column 12 may have any other shape or represent a different type of housing in which the cameras 14, 16 and, for example, the bulbs 28, the partially transparent mirror 26 and the monitor 18 are arranged.

According to an exemplary operating position, the distance between the partially transmitting mirror 26 and the glasses 38 of the user 30 is only between about 50 and 75 cm. In particular, the user 30 may, for example, stand in front of the mirror or sit in front of the partially transparent mirror 26 according to an activity to which the user 30 is wearing spectacles. Thus, the use of the preferred device according to the invention is also limited in spatial Conditions possible. Accordingly, device 10 may for example be designed so that the positions of the upper camera 14 and the side camera 16 and, for example, the partially transparent mirror 26 and the lighting means 28 are arranged vertically adjustable. The upper camera 14 can therefore also be located above or below the monitor 18. Furthermore, it is also possible to tilt or rotate the column 12 or the upper camera 14, lower camera 16, partially transparent mirror 26 and illuminating means 28 disposed on the column 12 about a horizontal axis in the frame of reference of the earth.

For example, according to another preferred embodiment of the invention, the lateral camera 16 may be replaced by a pattern projection device such as a conventional projector, and the three-dimensional data of the glasses may be determined by a conventional method such as phase measuring triangulation.

FIG. 2 shows a schematic plan view of preferred arrangements of the cameras 14, 16 in the operating position and the positioning of the spectacles 38 in the operating position, which is arranged by way of example on the user 30. As shown in Figure 2, projections of the effective optical axes 20, 22 intersect at a horizontal plane in the frame of reference of the earth at an angle of 23.5 °. The intersection angle between the effective optical axes 20, 22 in the plane, which is spanned by the two effective optical axes 20, 22 is, as shown in Figure 1, 30 °. The intersection point 24 of the effective optical axes 20, 22 corresponds to the center point of the bridge of the spectacles 38. Further, as shown in FIG. 2, a position of the lateral camera 16 may be variable along the effective optical axis 22, for example. The position 32 of the lateral camera 16 corresponds for example to the position as it is also shown in FIG. The lateral camera 16 may, for example, however, also be arranged offset along the effective optical axis 22 at a position 34, preferably the lateral camera 16 can be positioned as desired. In the image data generated by the lateral camera 16, however, at least one display means, for example in the form of a sticker or a similar mark on the spectacle lens as well as at least one spectacle lens edge 36 and a spectacle frame edge 36 of a pair of spectacles 38 of the user to be mapped.

FIG. 3 shows a schematic sectional view of the arrangement of the cameras 14, 16 in an exemplary operating position and a position of the spectacles 38, arranged on the user 30, in an exemplary operating position, from the side as shown in FIG. As already shown in FIG. 2, the lateral camera 16 can be positioned along the effective optical axis, for example at the position 32 or at the position 34. Further, in FIG. 3, the projection of the effective optical axes 20, 22 onto a vertical plane in the reference frame represented the earth. The angle between the effective optical axes 20, 22 is for example 23.5 °, which corresponds to an intersection angle of 30 ° in the plane, which is spanned by the effective optical axes 20, 22.

FIG. 4 shows in plan view a sectional view of a further embodiment of the device 10 according to the present invention. Instead of two cameras, only the upper camera 14 is used. The upper camera 14 has an optical axis 40. The optical axis 40 corresponds to a line extending from a center of the aperture (not shown) of the upper camera 14 and perpendicular to the plane of the aperture (not shown) of the upper camera 14.

Starting from the upper camera 14 is located in the direction of the optical axis 40, a beam splitter 42 in the beam path of the camera 14. The beam splitter 42 is for example designed such that it can be changed between two modes:

- The beam splitter 42 is either almost completely mirrored or

- The beam splitter is almost completely transparent to light.

If the beam splitter 42, for example, completely transparent to light, the optical axis 40 of the upper camera 14 is not deflected, but cuts the In this case, the effective optical axis 20 corresponds to the optical axis 40 of the upper camera 14. However, if the beam splitter 42 is completely mirrored, the optical axis 40 of the upper camera 14 is deflected by the beam splitter 42 according to known optical laws, as in FIG Figure 4 shown. For example, the optical axis 40 is deflected by an angle of 90 ° in a first deflected portion 44 of the optical axis 40 of the upper camera 14. The first deflected portion 44 intersects another optical element, such as a deflecting mirror 46. Thereby, the first deflected portion 44 of the optical axis 40 is redirected according to the conventional optical laws into a second deflected portion 48 of the optical axis 40. The second deflected portion 48 of the optical axis 40 intersects that of the spectacles 38. The second deflected portion 48 of the optical axis 40 corresponds to the effective axis 22 of the upper camera 14 in the event that the beam splitter 42 is completely mirrored.

From the upper camera 14, images of the spectacles 38 or of a portion of the spectacles 38 are generated at a later time, wherein the images are generated either with completely mirrored beam splitter 42 or with completely transparent beam splitter 42. In other words, the upper camera 14 can be used to generate two images of the spectacles 38 or of a portion of the spectacles 38 that correspond to the images that can be generated according to FIGS. 1, 2 or 3. However, in this preferred embodiment, the images are time-shifted generated by an image capture device, the upper camera 14.

FIG. 5 shows, by way of example, a presentation means 50. The presentation means 50 can be, for example, a so-called saddle point, which is designed, for example, as a sticker 50. However, the presentation means 50 can also be a monochrome dot 50, which can be arranged either as a sticker on the spectacle lens (shown in FIG. 6) or, for example, drawn directly onto the spectacle lens (shown in FIG. 6) with a stylus.

FIG. 6 shows a schematic view of image data as from the upper one Camera 14 are generated, ie a schematic frontal view of a portion of the glasses 38, wherein two lenses 54, 56 and a spectacle frame 52 are shown. FIG. 6 shows a boundary 62 of the spectacle frame 52 for the right-hand spectacle lens 54 and a border 64 of the spectacle frame 52 for the left-hand spectacle lens 56 in box dimensions, as well as intersecting points 66 of a ground plane in the reference frame with the spectacle-edge 52 with respect to the right-hand spectacle lens 54 and intersections 68 of a vertical plane in the reference frame of the earth perpendicular to the horizontal plane. The horizontal plane is shown by the dashed line 70, the vertical plane by the dashed line 72.

Similarly, in FIG. 6, intersections 74 of a horizontal plane and intersections 76 of a vertical plane for the left lens 56 are shown, with the horizontal plane being shown by the dashed line 78 and the vertical plane by the dashed line 80.

Preferably, the presentation means in the form of stickers 50 are automatically determined by the data processing device (not shown).

7 shows a schematic view of the image data of the lateral camera 16 according to FIG. 6. Since the lateral camera 16 is laterally below the partial area of the head of the user 30, intersections of a horizontal and a vertical plane with the edges of the spectacle frame 52 are not horizontal or vertical lines, as is the case in FIG. Rather, straight lines on which intersection points lie with the horizontal plane and the vertical plane are projected onto oblique lines 84 on the basis of the perspective view of the lateral camera 16. The horizontal plane 70 and the vertical plane 72 therefore intersect the edge 36 of the eyeglass frame 52 at the locations where the projected lines 84 intersect the edge 36 of the eyeglass frame 52, respectively.

By means of the intersection points 66, 68, 74, 76 shown in FIGS. 6 and 7, three-dimensional coordinates of the spectacles 30 can be generated. Furthermore, based on the three-dimensional coordinates, the box dimension in three-dimensional space be determined.

As an alternative to the generation of data or coordinates in three-dimensional space on the basis of the image data recorded under different directions, the image data can also be recorded in only one direction and the three-dimensional data can be generated on the basis of additional data. For example, it may be sufficient to record the image data substantially head-on and in addition to specify the lens angle and / or the angle of pre-tilt of the glasses and / or corneal vertex distance and / or head rotation, etc. Based on the image data and the additional data, the position in three-dimensional space, in particular of the spectacle lens in front of the eye can be determined.

Intersections 66, 68, 72, 74 and saddle point 50, respectively, may be determined by an optometrist and entered using a computer mouse (not shown). Alternatively, the monitor 18 may be designed as a "touch screen" and the intersections 66, 68, 72, 74 and the saddle point 50 may be determined and entered directly on the basis of the monitor 18. Alternatively, however, these data can also be generated automatically using image recognition software. In particular, it is possible for a software-supported image evaluation to take place with subpixel accuracy. According to a further embodiment of the invention, the positions of further points of the spectacles 38 can be determined and used to determine the optical parameters in three-dimensional space.

In FIGS. 6 and 7 only two saddle points 50 are shown. Preferably, four saddle points, more preferably six saddle points (not shown) are arranged, wherein two or three saddle points are arranged on each spectacle lens to allow a clear determination of the position of each spectacle lens in three-dimensional space.

Based on the three-dimensional user data of the glasses 30, the box size of the glasses 30 can be determined in three-dimensional space and in particular the Saddle point 50 position in box dimension (in three-dimensional space).

Furthermore, in FIG. 6 and FIG. 7, a lower tangent 86 is drawn onto the spectacle frame 52. The lower tangent 86 is part of the limit 62, 64 of the box dimension.

The glasses may also be designed such that pupils (not shown) are imaged.

Another embodiment of the apparatus 10 of the present invention is designed such that only one side, that is, either the right side corresponding to the right eye or the left side corresponding to the left eye, is imaged by both the upper camera 14 and the side camera 16 is. The optical parameters of the user 30 are determined on the one side and the symmetrical assumptions determine the optical parameters for both sides.

FIG. 8 shows a conventional apparatus for determining the engraving points of a spectacle lens according to the principle of "DoublePassReflection" in combination with a telecentric illumination and observation optics and a prism optics for dividing the image field into engraving points. With the help of this device, the engraving points can be determined and represented by the means of representation, for example by gluing saddle points.

The present invention is not limited to the above-described particularly preferred embodiments. The shape of the device may also differ from the shape described above. Rather, the illustration described above is merely exemplary. The device may for example be smaller, in particular transportable. Furthermore, the invention also includes variations thereof, in particular the use of a device according to the invention for determining a position of a spectacle lens relative to a spectacle frame. Furthermore, the present invention comprises a system comprising a device for determining a position of a spectacle lens relative to a spectacle frame and a pair of spectacles, wherein the system

a display means for displaying a characteristic point of

Spectacle lens,

at least two image recording devices (14, 16), which are designed and arranged, respectively image data of the display means and at least of

To produce partial areas of the spectacle lens and the spectacle frame and

LIST OF REFERENCE NUMBERS

10 device

12 pillar

14 upper camera

16 side camera 18 monitor

20 effective optical axis

22 effective optical axis

24 intersection

26 partially transparent mirror 28 light source

30 users

32 position 34 position

36 lens rim / eyeglass rim

38 glasses

40 optical axis

42 beam splitter

44 first deflected portion of the optical axis

46 deflection mirror

48 second deflected portion of the optical axis

50 stickers or dot

52 spectacle frame

54 right lens

56 left lens

62 Limit in box size

64 limit in box size

66 intersections

68 intersections

70 horizontal level

72 vertical level

74 intersections

76 intersections

78 horizontal level

80 vertical level

84 Straight

86 lower tangent

Claims

claims

A device (10) for determining a position of a spectacle lens (54, 56) relative to a spectacle frame (52)

at least one display means (50) for displaying at least one characteristic point of the spectacle lens,

at least one image recording device (14, 16) which is designed and arranged to generate image data of the at least one representation means (50) and at least partial regions of the spectacle lens (54, 56) and the spectacle frame (52) and

a data processing device which is designed to use the image data to determine a position of a spectacle lens (54, 56) relative to the spectacle frame (52).

2. Device (10) according to claim 1, wherein the data processing device is designed to determine the position of the spectacle lens (54, 56) relative to the spectacle frame (52) on the basis of the image data of at least one image recording device and on the basis of additional data.

3. Device (10) according to claim 1 or 2, with at least one second image recording device (14, 16), wherein the at least two image recording devices (14, 16) are designed and arranged, respectively image data of the at least one display means (50) and at least of Produce portions of the lens (54, 56) and the spectacle frame (52) under at least two receiving directions.

4. Device according to one of the preceding claims, wherein the data processing device is adapted to determine based on the image data, the position of the at least one characteristic point of the spectacle lens (54, 56) in the reference system of the box dimension of the spectacle lens.

5. The apparatus of claim 4, wherein the data processing device is designed, based on the image data, in particular the position of the characteristic point of the spectacle lens (54, 56) in the reference frame of the box dimension of the spectacle lens (54, 56), actual centering data of the spectacle lens (54, 56 ) relative to the spectacle frame (52).

6. Device according to one of the preceding claims, wherein the at least one display means (50) is designed to represent at least one engraving point of the spectacle lens (54, 56).

7. Apparatus according to claim 5 or 6, wherein the data processing means is adapted to determine a deviation of the determined, actual centering data from predetermined theoretical Zentrierdaten, wherein the predetermined theoretical Zentrierdaten are those Zentrierdaten, based on which the spectacle lens (54, 56) in the spectacle frame (52) has been arranged.

8. Apparatus according to claim 6, comprising a data output device which is designed to output the determined, actual centering data and / or the predetermined, theoretical centering data and / or the deviation of the determined, actual centering data from the predetermined, theoretical centering data.

9. Device according to one of the preceding claims, wherein the at least one display means (50) comprises at least one sticker, in particular in the form of a saddle point.

10. Device (10) according to one of the preceding claims, wherein the device (10) is adapted to the position of each spectacle lens (54, 56) of a To determine glasses relative to the spectacle frame (52).

11. Device according to one of the preceding claims with

- At least one pattern projection device, which is designed and arranged to project predetermined pattern data on at least portions of the spectacle lens (54, 56) and the spectacle frame (52).

12. A method of determining a position of a spectacle lens (54, 56) relative to a spectacle frame (52), comprising the steps of:

Representing at least one characteristic point of the spectacle lens (54, 56) by means of at least one representation means (50);

- Generating image data of the at least one display means (50) and at least partial areas of the spectacle lens (54, 56) and the spectacle frame (52) under at least two receiving directions and

Determining a position of a spectacle lens (54, 56) relative to the spectacle frame (52) from the image data.

13. The method according to claim 12, wherein on the basis of the image data, in particular the position of the at least one representation means (50), actual centering data of the spectacle lens (54, 56) relative to the spectacle frame (52) are determined.

14. The method of claim 12 or 13, wherein by means of the at least one display means (50) at least one engraving point of the spectacle lens (54, 56) is shown.

15. The method of claim 12, 13 or 14, wherein a deviation of the determined, actual centering of predetermined theoretical Zentrierdaten is determined and wherein the predetermined theoretical Zentrierdaten are those Zentrierdaten, based on which the lens (54, 56) in the spectacle frame ( 52) was arranged.

16. The method according to claim 15, wherein the determined, actual centering data and / or the predetermined, theoretical centering data and / or the deviation of the determined, actual centering data from the predetermined theoretical centering data by means of a

Data output device are output.

A computer program device comprising program parts which, when loaded in and executed by a computer, are suitable for carrying out a method according to any one of claims 12 to 16.