DE102014005281A1 - A method and apparatus for determining the position of at least one spectacle lens in space - Google Patents

Abstract

The invention relates to a device and a method for the contactless detection of a position of at least one eyeglass lens provided with markings in three-dimensional space.
The device comprises:
At least one illumination device which is designed to illuminate the at least one spectacle lens at least in the region of the markings;
- Two or more image pickup devices, which are designed to generate image data of the markers and at least partial areas of the at least one spectacle lens;
An image data processing device which is designed to determine three-dimensional positions of the markings on the basis of the generated image data;
A position determining device which is designed to determine the position of the at least one spectacle lens in space on the basis of spectacle lens data provided for the at least one spectacle lens, and on the basis of the determined three-dimensional marking positions.

Description

The present invention relates to a device and a method for the non-contact detection of a three-dimensional position of one or more engraved spectacle lenses.

State of the art

In the manufacture of spectacle lenses, it is necessary to determine the position of the spectacle lens. For example, when grinding, polishing, coating, dyeing, blocking and / or measuring one or more spectacle lenses, the exact position of the at least one spectacle lens to be manufactured or processed must be known in corresponding production or processing machines. Conventionally, the position of the spectacle lens in a machine is mechanically detected and / or a certain position is assumed due to the use of a specific holder in the range of predetermined tolerances. In the machines used in manufacturing, for example, mechanical probes for the detection of the spectacle lens are used.

However, this procedure has the disadvantage that the spectacle lenses to be detected can be damaged by the mechanical contact. In addition, a mechanical scan is time-consuming and error-prone. Also, the accuracy of the position determination of one or more lenses are set by the mechanics used limits.

In addition to the mechanical detection, various machines are used in the production of spectacle lenses, which perform an engraving recognition in order to position the glasses. A method and a device for such engraving recognition are, for example, in DE 10 2011 078 833 A1 described. In the previously known systems with engraving recognition, a two-dimensional detection of engraving of the spectacle lenses takes place, which as a rule only permits the determination of a rotation of the lenses in a predetermined mechanical support. In order to determine the three-dimensional position of the lenses in space must be known or measured in the previously known systems or methods, the position of the mechanical support and the position of the lens in the holder must be firmly assumed or measured mechanically. For this purpose, there are special brackets in the production, such. As holders with a 3-point support or a plan support, and for each glass, the position of the glass is calculated in such a holder. The brackets used are therefore expensive to produce and therefore expensive to buy. In addition, the conventional system or method can be susceptible to error, especially with strong cylinder glasses, since with such strong cylinder glasses, the glass can easily tilt.

task

It is therefore an object of the present invention to overcome the above-mentioned disadvantages in determining the position or position of the lenses. In particular, it is an object of the present invention to increase the accuracy in determining the position or position of one or more lenses.

This object is achieved by the subject matters of the independent claims. Advantageous embodiments are the subject of the dependent claims.

definitions

• – „Brillengläser” sind beispielsweise Einstärkenbrillengläser, Mehrstärkenbrillengläser, beispielsweise Gleitsichtgläser, mit oder ohne Tönung, Verspiegelung und/oder Polarisationsfiltern.
• – Der Begriff „bestimmen” beinhaltet beispielsweise „berechnen”, „ablesen aus einer Tabelle”, „entnehmen einer Datenbank”, usw.
• – Die „Lage” bzw. „Position” eines Brillenglases im Raum beinhaltet insbesondere alle notwendigen Informationen, um den Ort und/oder die Anordnung und/oder die Ausrichtung des Brillenglases im dreidimensionalen Raum anzugeben. Die Lage bzw. Position eines Brillenglases kann durch die Angabe von drei dreidimensionalen Koordinaten ausgewählter bzw. charakteristischer Punkte des Brillenglases bestimmt sein. Insbesondere können auch die Vorneigung des Brillenglases, die Stellung einer Scheibenebene, die Lage von optisch besonders relevanten Gebieten, wie z. B. Nahbezugspunkt bzw. -bereich, Fernbezugspunkt bzw. -bereich, usw., die Position des Zentrierpunktes, der Astigmatismusachse usw. zur Festlegung der Lage eines Brillenglases dienen. Weitere mögliche Parameter zur Festlegung der Lage bzw. Position des Brillenglases sind die Aussenkontur des Glases, bei gestempelten Gläsern der Stempel, und/oder Nuten, d. h. Aussparungen, die in der Fertigung – beispielsweise zur Erzeugung eines Farbverlaufs – eingebracht wurden. Als räumliche Koordinaten können kartesische Koordinaten (x, y, z-Koordinaten), aber auch andere dreidimensionale Koordinaten, wie z. B. Zylinder- oder Kugelkoordinaten verwendet werden.
• – „Markierungen” eines Brillenglases sind Kennzeichnungen charakteristischer Punkte, welche die Lage bzw. Position des Brillenglases in eindeutiger Weise bestimmbar machen. Der Begriff Markierung im Sinne dieser Beschreibung umfasst jede Art der mit einer erfindungsgemäßen Bildaufnahmeeinrichtung detektierbaren Kenntlichmachung ausgewählter bzw. charakteristischer Punkte des Brillenglases. Beispielsweise können Markierungen Gravuren bzw. Gravurpunkte des Brillenglases sein. Markierungen bzw. Gravuren können insbesondere zweidimensionale, flächige Gebilde, wie Kreise, Kreuze, usw. sein. Ein Brillenglas kann ein oder mehrere Markierungen bzw. Gravuren aufweisen. Weiterhin sind Markierungen bzw. Gravuren vorzugsweise derart ausgebildet, dass sie für das bloße Auge, d. h. ohne weitere optische Hilfsmittel, im Wesentlichen nicht sichtbar sind. Beispielsweise können Gravuren sogenannte Mikrogravuren sein, die z. B. als Kreis(e), Raute(n), usw., ausgestaltet sind. Bei gestempelten Gläsern kann auch der Stempel als Markierung dienen.

Before the following detailed description of the invention, terms are defined that contribute to the understanding of the invention:

• "Eyeglass lenses" are, for example, single-vision lenses, multi-vision lenses, for example progressive lenses, with or without tinting, mirroring and / or polarization filters.
• - The term "determine" includes, for example, "calculate", "read from a table", "extract from a database", etc.
• The "position" or "position" of a spectacle lens in the room contains, in particular, all the information necessary to indicate the location and / or the arrangement and / or the orientation of the spectacle lens in three-dimensional space. The position or position of a spectacle lens can be determined by specifying three three-dimensional coordinates of selected or characteristic points of the spectacle lens. In particular, the bias of the lens, the position of a disc plane, the location of optically particularly relevant areas, such. B. Near reference point or area, remote reference point or area, etc., the position of the centering point, the astigmatism axis, etc. are used to determine the position of a spectacle lens. Other possible parameters for determining the position or position of the spectacle lens are the outer contour of the glass, with stamped glasses of the stamp, and / or grooves, ie recesses, which were introduced in the production - for example, to produce a color gradient. As spatial coordinates Cartesian coordinates (x, y, z coordinates), but also other three-dimensional coordinates such. B. cylindrical or spherical coordinates are used.
• "Markings" of a spectacle lens are markings of characteristic points which make the position or position of the spectacle lens unambiguously determinable. The term marking in the sense of this description encompasses any type of identification of selected or characteristic points of the spectacle lens detectable with an image recording device according to the invention. For example, markings may be engravings or engraving points of the spectacle lens. Markings or engravings can in particular be two-dimensional, flat structures, such as circles, crosses, etc. A spectacle lens can have one or more markings or engravings. Furthermore, markings or engravings are preferably formed such that they are substantially invisible to the naked eye, ie without further optical aids. For example, engravings may be so-called micro engravings z. B. as a circle (s), diamond (s), etc., are configured. For stamped glasses, the stamp can also serve as a marker.

• – eine Beleuchtungseinrichtung, welche ausgelegt und angeordnet ist, das zumindest eine Brillenglas zumindest im Bereich der Markierungen zu beleuchten;
• – zwei oder mehrere Bildaufnahmeeinrichtungen, welche ausgelegt sind, Bilddaten der Markierungen und zumindest von Teilbereichen des zumindest einen Brillenglases zu erzeugen;
• – eine Bilddatenverarbeitungseinrichtung, welche ausgelegt ist, anhand der erzeugten Bilddaten dreidimensionale Positionen der Markierungen zu ermitteln;
• – eine Positionsbestimmungseinrichtung, welche ausgelegt ist, anhand von Brillenglasdaten, welche für das zumindest eine Brillenglas bereitgestellt sind, und anhand der ermittelten dreidimensionalen Markierungspositionen die Position des zumindest einen Brillenglases im Raum zu bestimmen.

One aspect of the invention relates to a device for the contactless detection of a position of at least one eyeglass lens provided with markings in the space. The device comprises

• A lighting device which is designed and arranged to illuminate the at least one spectacle lens at least in the region of the markings;
• - Two or more image pickup devices, which are designed to generate image data of the markers and at least partial areas of the at least one spectacle lens;
• An image data processing device which is designed to determine three-dimensional positions of the markings on the basis of the generated image data;
• A position determining device which is designed to determine the position of the at least one spectacle lens in space on the basis of spectacle lens data provided for the at least one spectacle lens, and on the basis of the determined three-dimensional marking positions.

The at least one spectacle lens whose position is to be determined with the device according to the invention has markings. The markings are preferably engravings, in particular permanent engravings. Further preferably, the mark is a micro engraving, which can not be perceived by the naked human eye, without further aids, or which the wearer of the glasses does not notice or find disturbing when wearing the spectacle lenses. Preferably, the engravings have a dimension less than 2 mm, more preferably less than 1 mm, more preferably less than 0.5 mm, and most preferably less than 0.2 mm. The line width of the engravings is preferably in the range of 50 μm to 120 μm, particularly preferably in the range of 60 μm to 100 μm, more preferably in the range of 70 μm to 90 μm, and most preferably the line width of the engravings is about 80 μm. Advantageously, the at least one spectacle lens has at least three markings or engravings.

The illumination device is designed and arranged to illuminate or illuminate the at least one spectacle lens at least in regions. In particular, the illumination device is designed and arranged to illuminate or illuminate the at least one spectacle lens at least in the region of the markings or engravings. "In the area of markings" means that, in addition to the markings, their surroundings can also be illuminated. But it is also possible that the entire lens is illuminated or illuminated.

The illumination device may, for example, comprise a substantially rectangular light emission surface. The luminous surface can be realized for example by LEDs, other bulbs and / or a backlit diffuser plate. The illumination device preferably comprises a screen or a luminescent screen.

Two image 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 a deflection mirror, the image data being recorded or generated with the camera by means of the deflection mirror. Two image recording devices therefore include, for example, two, in particular, digital cameras and at least two deflecting elements or deflecting mirrors, wherein in each case one digital camera and at least one deflecting mirror represent an image recording device.

Furthermore, two image recording devices can also consist of exactly one digital camera and two deflection elements or deflecting 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 the subregion of the at least one spectacle lens is imaged by means of the one deflection mirror, and generates image data at a second time, which images the subregion of the at least one spectacle lens by means of the other deflection mirror. Furthermore, the camera can also be arranged such that on the first or the second time from the camera image data are generated, wherein no deflection mirror is necessary or disposed between the camera and the at least one spectacle lens.

Preferably, image data of widely overlapping partial regions, in particular of the same partial region of the at least one spectacle lens are generated by the two or more image recording devices, wherein the image recording devices are designed and arranged so that at least the markings or engravings are completely imaged in the generated image data. Furthermore, only those generated image data are used for determining the position of the at least one spectacle lens, in which markings or engravings of the user are completely imaged. In particular, one and the same mark of the spectacle lens is completely imaged in the image data generated by the two or more image pickup devices. Furthermore, all markings or engravings of the spectacle lens can be imaged in the image data of the two image recording devices.

In other words, a two-dimensional image of at least one subregion of the at least one spectacle lens is generated by each image recording device. Each of the images contains at least one marking or engraving of the at least one spectacle lens. For example, image data generated by an image pickup device may include only one mark. On the other hand, image data which is generated by a further image recording device may contain a plurality of markings. In any case, at least one mark is imaged in all the image data used for further evaluation, wherein the same mark is used in all of these image data.

By means of the image data processing device, a stereo image or stereo image data of at least one subregion of the spectacle lens, in particular of the markings or engravings, can be generated from the two-dimensional images recorded by the two or more image recording devices. The image data processing device is furthermore designed to determine three-dimensional positions of the markings on the basis of the image data generated by the image recording devices or the stereo image data calculated therewith.

By means of the position determination device, the exact position of the at least one spectacle lens in space can be determined. The position is determined on the basis of spectacle lens data, which are provided for the at least one spectacle lens, and on the basis of the determined three-dimensional marking positions. The spectacle lens data includes the positions of the attached marks or engravings in the at least one spectacle lens. Further, the eyeglass lens data preferably also includes further data on the nature of the lens, such as the thickness and curvature of the lens. The eyeglass lens data may also include positions of dog tags applied to a mount of the at least one eyeglass lens. If the at least one spectacle lens is fastened in such a holder, the position of the at least one spectacle lens in the holder can thus be determined precisely.

The image data processing device and the position determination device can together form a data processing device. The data processing device is preferably one or more computers or microprocessors. The image data processing device and the position determination device can operate independently of one another. Preferably, the data processing device is designed such that the image data processing device and the position determination device are operated by means of a microprocessor. In other words, the data processing device is designed such that a microprocessor executes both the task (s) of the image data processing device and the position determination device.

With the device according to the invention it is thus possible to measure three-dimensional marking or engraving positions in space. In particular, with a stereo camera system, the permanent engravings, which are applied to spectacle lenses, can be recorded and based on additionally provided spectacle lens data, ie. H. existing information of the spectacle lens (position of the engraving on the glass, curvature of the glass, etc.), the exact position of the at least one spectacle lens are determined in three-dimensional space. Compared to conventional non-contact measuring devices in which only a determination of a rotation of the glasses in a given mechanical support is possible, with the device according to the invention both the x, y, z position as well as torsional and / or tilt angle in a certain coordinate system , For example, in the coordinate system of a manufacturing or processing machine of the at least one spectacle lens detected.

The device according to the invention thus makes it possible to realize the determination of the position or position of a transparent spectacle lens with purely optical means. In particular, the inventors have recognized that the combination of a three-dimensional image acquisition with a Marker recognition and the knowledge about the spectacle lens data to the unexpected technical effect leads that a positioning accuracy in three-dimensional space of better than 100 microns can be achieved. Therefore, no complex and expensive mechanical support of the spectacle lens is required more to determine the exact position or position of the spectacle lens in the room.

In a preferred embodiment, the at least one spectacle lens is fixed by means of a holder. The holder is preferably provided with further markings or engravings.

The holder is preferably transparent or contains recesses, so that the at least one spectacle lens can be illuminated by the illumination device. For example, the holder is a glass pane on which the at least one spectacle lens is placed or fixed. The holder may alternatively also be a lateral clamping device, in which the at least one spectacle lens can be clamped.

If the at least one spectacle lens is fastened in the holder and image data of the markings or engravings of the holder is also generated by the image recording devices, then the position of the at least one spectacle lens in the holder can be determined precisely.

With the holder, the at least one spectacle lens can then be processed or measured in further process steps with precise knowledge of the position of the at least one spectacle lens. This can be z. B. calculated using the beam paths in a meter and based on the exact position of the glass in these beam paths setpoints for this situation. These calculated setpoints can then be compared with measured values. Furthermore, it is possible, in knowledge of the exact position of the spectacle lens surfaces in three-dimensional space, to tune printing, coating or other processing methods optimally to the surface profile of the at least one spectacle lens.

In a further preferred embodiment, the illumination device is designed to generate a structured illumination.

A static structured illumination can be realized, for example, with a printed film which is arranged on the light exit surface of a luminescent screen. But it is also possible to generate the structured illumination using a screen or monitor, which is controlled for example by a computer or microprocessor and thus also allows varying patterns.

Preferably, a plurality of images or image data for different illumination patterns are respectively generated with the image recording devices. By calculating several such images, so-called phase images can also be generated. So z. Example, when using a lighting pattern, which is composed of sinusoidal strips, a plurality of images are recorded, wherein between the recording of two images, the strips are each shifted by a certain phase. The individual images can then be combined to form a common image, which has a higher contrast of the engravings than the respective individual images. By using a structured illumination, the three-dimensional marking positions can thus be determined more precisely.

In a further preferred embodiment, at least one image recording device comprises a camera with a high-resolution telecentric lens.

Telecentric lenses offer the advantage of a high depth of field, which makes it easier to find or detect the engraving. In particular, it is no longer necessary - despite the different curvature of glasses - to constantly focus on the surface of the glass and / or track the camera using telecentric lenses in contrast to normal lenses. In the working area, the depth of field of telecentric lenses is almost infinite. For example, for cost reasons, only one of the image recording devices can have a camera with a telecentric lens. For example, the device may have two image recording devices, only one of which has a camera with a telecentric lens.

Advantageously, several or all image recording devices comprise cameras with telecentric lenses.

In a further preferred embodiment, the illumination device for each image pickup device comprises a light source with a light exit surface, wherein the light sources are arranged such that the respective light exit surface faces the associated image pickup device.

The light sources preferably have a substantially rectangular light exit or light emission surface. As a light source z. As a screen or a screen can be used. Preferably, each light source is arranged or aligned such that the light exit surface is substantially perpendicular to the optical axis of that image pickup device to which the light exit surface faces the light source. This leads to a better illumination and thus to a better contrast of the images or image data. The optical axis of an image pickup device corresponds to the optical axis of a camera or a lens of the image pickup device.

In a further preferred embodiment, the illumination device for each image recording device comprises a light source, a beam splitter and a retroreflector.

Preferably, the associated light source, the associated beam splitter and the associated retroreflector are arranged for each image pickup device such that the light emitted by the light source passes through the at least one spectacle lens and arrives at the image pickup device.

The retroreflectors can be designed, for example, as retroreflective disks, in particular as rotatable retroreflective disks. By rotating the retroreflective disks, it is advantageously achieved that disturbing structures of the disks are averaged out in the image generated by the image recording device. Overall, this leads to improved images or image data.

• – Bereitstellen von Brillenglasdaten des zumindest einen Brillenglases;
• – Beleuchten des zumindest einen Brillenglases zumindest im Bereich der Markierungen mittels einer Beleuchtungseinrichtung;
• – Erzeugen von Bilddaten der Markierungen und zumindest von Teilbereichen des zumindest einen Brillenglases mittels zwei oder mehr Bildaufnahmeeinrichtungen;
• – Ermitteln von dreidimensionalen Positionen der Markierungen anhand der erzeugten Bilddaten mit Hilfe einer Bilddatenverarbeitungseinrichtung;
• – Bestimmen der Position des zumindest einen Brillenglases im Raum anhand der bereitgestellten Brillenglasdaten und anhand der ermittelten dreidimensionalen Markierungspositionen mit Hilfe einer Positionsbestimmungseinrichtung.

A further aspect relates to a method for the contactless detection of a position of at least one eyeglass lens provided with markings in three-dimensional space. The method comprises the following steps:

• Providing spectacle lens data of the at least one spectacle lens;
• - Illuminating the at least one spectacle lens at least in the region of the markings by means of a lighting device;
• - generating image data of the markings and at least partial areas of the at least one spectacle lens by means of two or more image recording devices;
• - Determining three-dimensional positions of the markers based on the image data generated by means of an image data processing device;
• Determining the position of the at least one spectacle lens in space on the basis of the spectacle lens data provided and on the basis of the determined three-dimensional marking positions with the aid of a position-determining device.

For each of the embodiments claimed in relation to this aspect, the statements made above or below apply to the embodiments of the preceding aspect.

In a preferred embodiment, the at least one spectacle lens is fixed before illumination with a holder, which is preferably provided with further markings.

In a further preferred embodiment, the illumination is carried out with structured light.

In a further preferred embodiment, the pattern of the structured light is changed and each image pickup device picks up image data on different patterns of the structured light.

In a further preferred embodiment, the illumination takes place with the aid of beam splitters and retroreflectors. Alternatively or additionally, the image data is generated with the aid of telecentric lenses. In a further preferred embodiment, an edge of the at least one spectacle lens, ie all points of the spectacle lens edge, as markings ( 80 ) used. In addition, engravings applied to the at least one spectacle lens are additionally recorded by means of a camera with a telecentric lens.

Since the spectacle lens edge or the points of the spectacle lens edge have a different reflection behavior, the spectacle lens edge or the outer contour of the spectacle lens can also serve as a marking.

The determination of the position of the spectacle lens can be realized via the outer contour of the glass, for which an inexpensive simple objective is sufficient. By means of the camera with a telecentric lens, engravings additionally applied to the spectacle lens can be detected. About the three-dimensional measurement of the lens edge of the frame lens angle of the glasses can then be measured and the exact positioning of the engraving by means of the camera with a telecentric lens, the centering properties of the glasses can be checked.

• – Detektieren einer Position des zumindest einen Brillenglases im dreidimensionalen Raum;
• – Messen und/oder Bearbeiten des zumindest einen Brillenglases auf Basis der detektierten Position des zumindest einen Brillenglases.

Another aspect relates to a method for measuring and / or processing at least one eyeglass lens provided with markings. The method comprises the steps:

• - Detecting a position of the at least one spectacle lens in three-dimensional space;
• Measuring and / or processing the at least one spectacle lens on the basis of the detected position of the at least one spectacle lens.

The detection of a position of the at least one spectacle lens in three-dimensional space takes place according to the above-described method according to the invention.

The inventive method is particularly suitable to a complete glasses, ie a spectacle frame with spectacle lenses to measure or edit.

The measuring of the at least one spectacle lens comprises, for example, the checking of a correct block position of a spectacle lens. For example, in the case of the measurement of complete spectacles, the measuring involves checking the correct incorporation of one or both spectacle lenses in a socket. Measuring thus includes quality control.

The processing of the at least one spectacle lens includes, for example, blocking, grinding, polishing, coating and / or coloring of the at least one spectacle lens.

After the exact position of the at least one spectacle lens, for example in the coordinate system of a machine, has been detected, parameters for the measurement or processing and / or parameters of the machine can be made on the basis of the detected position. The precise position determination according to the invention of the spectacle lens to be manufactured, measured and / or processed, or the spectacle lenses to be manufactured, measured and / or processed, or spectacles to be manufactured, measured and / or processed, thus leads directly to a higher one Precision in production, measurement and / or processing. In particular, the error rate in the production, measurement and / or processing of spectacle lenses or spectacles can thus be significantly reduced.

In the following, individual embodiments for solving the problem will be described by way of example with reference to the figures. In this case, the individual embodiments described have in part features that are not absolutely necessary in order to carry out the claimed subject matter, but which provide desired properties in certain applications. Thus, embodiments are also to be regarded as falling under the described technical teaching, which does not have all the features of the embodiments described below. Further, in order to avoid unnecessary repetition, certain features will be mentioned only with respect to each of the embodiments described below. The individual embodiments are therefore disclosed not only in isolation, but also in a synopsis with one or more features of different embodiments. Based on this synopsis, those skilled in the art will recognize that individual embodiments may also be modified by incorporating one or more features of other embodiments. A systematic combination of the individual embodiments with single or multiple features described in relation to other embodiments is possible.

Brief description of the drawings

1 shows an exemplary spectacle lens with markings or engravings in a simplified perspective view.

2 shows an embodiment of a device according to the invention in a simplified perspective view;

3 shows a further embodiment of a device according to the invention in a simplified perspective view;

4 shows a further embodiment of a device according to the invention in a simplified perspective view;

Detailed description of the drawings

In order to be able to determine the position of one or more spectacle lenses with the method according to the invention or the device according to the invention, the spectacle lens to be measured or the spectacle lenses to be measured must have markings, in particular engravings.

1 shows an exemplary spectacle lens 30 , which with three marks or engravings 80 is provided. The three engravings are arranged so that they are not all on a connecting line. In other words, there are only two engravings on a connecting line. The spectacle lens may also have more than three engravings, for example 4, 5, 6, 7 etc. engravings. The engravings 80 can be on the glass surface. Preferably, the markers are 80 To permanent engravings, which from the manufacturer in the unfinished, ie still to be processed spectacle lens 30 be introduced. So these engravings 80 for the future wearer of glasses are not perceived as disturbing or thus these engravings 80 The visual characteristics of the spectacle wearer are not negatively affected, are the engravings 80 designed so small (micro engravings) that they are invisible or at least imperceptible to the human eye without further aids.

2 shows a schematic representation of an embodiment of the device according to the invention. The device comprises a lighting device 200 and two or more image pickup devices 100 , With the lighting device 200 and the two or more image pickup devices 100 can be three-dimensional image data of engraving 80 of the spectacle lens 30 be generated. Furthermore, the inventive Device an image data processing device (not shown here), with the three-dimensional positions of the markers 80 can be determined. On the basis of these three-dimensional marking positions and additionally provided spectacle lens data, the position of the spectacle lens in space can then be determined with the aid of a position-determining device (not shown here).

In the 2 As in the following figures, for example, only a spectacle lens or a test lens 30 represented whose position in three-dimensional space to be determined. With the device according to the invention, it is also possible to detect the position of a plurality of spectacle lenses, in particular of two spectacle lenses.

The spectacle lens 30 is by means of a holder or a holder 40 fixed. The holder 40 can, as in 2 shown, in the simplest case be a glass or a glass table on which the spectacle lens is placed or on which the spectacle lens rests. Alternatively or additionally, the spectacle lens with a lateral clamping device (not shown here) can be fixed or fixed. The holder or the holder must be transparent or have recesses on relevant parts, so that the spectacle lens to be measured with the illumination device 200 can be illuminated.

In the embodiment of the 2 is the holder 40 with the spectacle lens 30 between the lighting device 200 and the image capture devices 100 arranged so that at least part of the illumination device 200 emitted light the spectacle lens 30 happen and from the image capture devices 100 can be detected. In other words, the lens becomes 30 from the lighting device 200 rayed.

The lighting device 200 can in the simplest case only consist of one or more light sources to illuminate the lens to be measured or to illuminate. As in 2 indicated, the lighting device and a screen or a screen 52 include. With the screen or screen 52 can the spectacle lens 30 not only be illuminated, but it can thus be generated in particular a structured lighting. A static structured illumination can be realized for example by means of a printed with a pattern film, which is arranged above or on the light exit surface of the phosphor screen. The pattern can be z. B. be a striped pattern. Advantageously, the pattern of the structured illumination is changeable. This can be z. B. can be achieved with a screen or monitor, which is controlled by a computer or microprocessor. Preferably, the same computer or microprocessor also controls the image data processing device and / or the position determination device.

The two or more image pickup devices 100 form a stereoscopic system with which three-dimensional (3D) image data or three-dimensional images can be generated. In particular, 3D image data of the engravings of the spectacle lens can thus be generated. In the 1 shown image recording devices 100 each include a camera 10 , For example, a CCD camera, and a telecentric lens 20 , The cameras 10 or the telecentric lenses 20 are aligned so that at least the areas of the lens containing engravings is detected by each camera. In particular, the cameras can 10 or the telecentric lenses 20 be aligned so that the entire lens 30 captured by every camera. This enables a 3D measurement of the engraving positions.

The image capture devices 100 or the cameras 10 can be controlled by a computer. For example, the image pickup devices become 100 or the cameras 10 controlled by the same computer, which also includes the lighting device 200 or the screen 52 controls. Advantageously, a plurality of images are taken with structured illumination, wherein the pattern of the structured illumination is changed during recording. In other words, multiple images are taken with different patterns. By calculating several images, so-called phase images can also be generated. For example, several images with sinusoidal stripes, in which the strips are each shifted by a certain phase, are assembled into a common image. By using structured illumination, the contrast resolving power of the image pickup devices can be increased. This makes it easier and more reliable to detect the engravings or to determine their three-dimensional positions.

A further preferred embodiment of the device according to the invention is in 3 shown schematically. This embodiment is through a dual screen configuration 52 characterized. The light exit surface of the screens or light screens 52 is each aligned substantially perpendicular to an opposing lens. In other words, the screens are fluorescent screens 52 arranged or aligned such that the light exit surface of the screens or luminescent screens 52 essentially perpendicular to the optical axis 15 an opposite image pickup device 100 stands. For each image capture device 100 is thus a separate screen or fluorescent screen 52 intended. It is about screens 52 which emit a dynamic, ie changing intensity pattern, advantageously both screens are controlled and synchronized by a computer. Such a configuration improves the illumination of the spectacle lens 30 or the engravings 80 concerning the image pickup devices 100 , This improves the contrast of the pictures and leads to an improved visibility of the engravings.

A further preferred embodiment of the device according to the invention is in 4 shown schematically. In this embodiment, the visibility of the engraving is achieved by the lighting device 200 two separate light sources 50 , two beam splitters 60 and two retroreflective discs 70 includes.

In particular, for each image pickup device 100 a light source 50 , a beam splitter 60 and a retroreflective disk 70 intended. To illustrate the beam path is in 4 an exemplary ray of light 54 located. That from the light source 50 emitted light is emitted by the beam splitter 60 over the lens 30 to the retroreflective disk 70 directed. That of the retroreflective disk 70 reflected light then passes through the lens again and passes over the beam splitter 60 to the image recording device 100 or into the camera 10 ,

The retroreflective disks are arranged or aligned such that their reflective surface is substantially perpendicular to the optical axis 15 an opposite image pickup device 100 aligned. The retroreflective disks can advantageously be designed as rotatable retroreflective disks. By rotating the retroreflective disks during image acquisition, disturbing structures in the disks can be averaged out. The visibility of the engravings 80 can thus be further increased and thus the position of the spectacle lens can be improved.

One possible implementation of the device involves automatic recognition of the engravings. After determining several engraving positions in the room, information about the glass can be used to calculate the position and tilt of the glass in the room.

LIST OF REFERENCE NUMBERS

10

camera

15

Optical axis

20

Telecentric lens

30

Test lens or spectacle lens

40

holder

50

light source

52

Screen or fluorescent screen

54

exemplary light beam

60

beamsplitter

70

Retroreflector (Retroreflex Disc)

80

Marking (engraving)

100

Image recording device

200

lighting device

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

• DE 102011078833 A1 [0004]

Claims (13)

Device for the contactless detection of a position of at least one with markings ( 80 ) provided spectacle lens ( 30 ) in three-dimensional space, comprising: - a lighting device ( 100 ), which is designed, the at least one spectacle lens ( 30 ) at least in the area of the markings ( 80 ) to illuminate; Two or more image capture devices ( 200 ), which are designed image data of the markings ( 80 ) and at least portions of the at least one spectacle lens ( 30 ) to create; An image data processing device which is designed to use the image data generated to generate three-dimensional positions of the markings ( 80 ) to investigate; A position-determining device which is designed on the basis of spectacle lens data which for the at least one spectacle lens ( 30 ) are provided, and based on the determined three-dimensional marking positions, the position of the at least one spectacle lens ( 30 ) in the room. Device according to claim 1, wherein - the at least one spectacle lens ( 30 ) with a holder ( 40 ) and wherein the holder ( 40 ) preferably with further markings ( 30 ) is provided. Apparatus according to claim 1 or 2, wherein the illumination device ( 200 ) is designed to produce a structured lighting. Device according to one of the preceding claims, wherein at least one image recording device ( 100 ) a camera ( 10 ) with telecentric lens ( 20 ). Device according to one of the preceding claims, wherein the illumination device ( 200 ) to each image capture device ( 100 ) a light source ( 50 ) with a light exit surface, the light sources ( 50 ) are arranged such that the respective light exit surface of the associated image recording device ( 100 ) is facing. Device according to one of the preceding claims, wherein the illumination device ( 200 ) to each image capture device ( 100 ) a light source ( 50 ), a beam splitter ( 60 ) and a retroreflector ( 52 ). Method for contactless detection of a position of at least one with markings ( 80 ) provided spectacle lens ( 30 ) in three-dimensional space, comprising the steps of: providing spectacle lens data of the at least one spectacle lens ( 30 ); Illuminate the at least one spectacle lens ( 30 ) at least in the area of the markings ( 80 ) by means of a lighting device ( 200 ); - generating image data of the markings ( 80 ) and at least portions of the at least one spectacle lens ( 30 ) by means of two or more image recording devices ( 100 ); Determining three-dimensional positions of the markings 80 ) based on the generated image data by means of an image data processing device; Determining the position of the at least one spectacle lens ( 30 ) in space on the basis of the provided spectacle lens data and on the basis of the determined three-dimensional marking positions with the aid of a position-determining device. The method of claim 7, wherein the at least one spectacle lens before being illuminated with a holder ( 40 ), which preferably with further markings ( 80 ) is provided. The method of claim 7 or 8, wherein the illumination is done with structured light. Method according to claim 9, wherein the pattern of the structured light is changed and each image recording device ( 100 ) Captures image data on different patterns of structured light. Method according to one of claims 7 to 10, wherein the illumination by means of beam splitters ( 60 ) and retroreflectors ( 70 ), and / or wherein the generation of the image data by means of telecentric lenses ( 20 ) he follows. Method according to one of the preceding claims, wherein an edge of the at least one spectacle lens as markings ( 80 ) is used and wherein additionally applied to the at least one lens applied engraving by means of a camera with telecentric lens. Method for measuring and / or processing at least one with markings ( 80 ) provided spectacle lens ( 30 ), comprising: - detecting a position of the at least one spectacle lens ( 30 ) in the three-dimensional space according to one of claims 7 to 12; Measuring and / or processing the at least one spectacle lens ( 30 ) based on the detected position of the at least one spectacle lens ( 30 ).

Images