• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Arrangement (1) for analyzing a light pattern (3) caused by refraction and reflection on a gemstone (2), comprising a light source (4) for illuminating the gemstone (2), a holding device (5) for holding the gemstone (2), a, in particular flat, scattering screen (6) for imaging the light pattern (3) and a camera (7) for receiving the light pattern (3) imaged on the scattering screen (6), the arrangement (1) comprising a semitransparent optical element (8) for deflecting the light (9) emanating from the light source (4) in the direction of the gemstone (2) and transmission of the light (10) refracted and reflected at the gemstone (2).
    公开号:AT514332A4
    申请号:T659/2013
    申请日:2013-08-27
    公开日:2014-12-15
    发明作者:
    申请人:Swarovski D Kg；
    IPC主号:
    专利说明:

    • Μ 73819 31 / fr
    The invention relates to an arrangement for analyzing a caused by refraction and reflection on a gemstone light pattern comprising a light source for illuminating the gemstone, a holding device for holding the gemstone, a particular flat, scattering screen for imaging the light pattern and a camera for receiving the on the scattering screen imaged light pattern. The invention further relates to a method for analyzing a light pattern caused by refraction and reflection on a gemstone by means of the arrangement according to the invention.
    An arrangement with the mentioned components is known for example from US 5,828,405. A disadvantage of this arrangement according to the prior art is that the illumination of the diamond to be examined takes place via an opening in the diffuser screen. As a result, the part of the light pattern which would be imaged on the diffuser in the region of this opening is lost. In addition, only a small part of the diamond can be illuminated with the illumination arrangement disclosed in US Pat. No. 5,828,405. Also in this way there is a loss of information about the diamond.
    And finally comes as a further disadvantage that it is necessary due to the geometry of the illumination arrangement to arrange the camera for receiving the light pattern imaged on the diffuser on the one hand at an angle to the screen and on the other hand to position relatively close to the diffusing screen. The latter requires the use of an extreme fisheye lens. Overall, the arrangement of the camera with respect to the scattering screen in US 5,828,405 results in strong perspective distortions of the recorded light pattern. Theoretically, one could indeed increase the distance of the camera to the diffuser, so that the camera, for example, at the height of the gem or even behind it, but then the free view of the diffuser would be limited by parts of the lighting arrangement or the gem itself, which in turn would lead to a loss of information.
    For the sake of completeness, however, it should also be noted that the objective of US Pat. No. 5,828,405 is to provide a characteristic "fingerprint" of a user
    Gemstone and compare with a stored in a database fingerprint to identify the gemstone in case of theft. As long as one always takes the image of the gemstone with the same device, loss of information and perspective distortions play no role.
    In contrast, the arrangement of the subject invention for analyzing a caused by refraction and reflection on a gemstone light pattern is used. For example, this is about analyzing the quality of a gem, which is influenced by, for example, parameters such as geometry or polish. Against the background of this objective, the mentioned disadvantages very much play a role.
    It should be noted that the subject arrangement or the subject method in principle can be used to analyze all types and shapes of gemstones. In particular, it is also possible to analyze natural or synthetically produced jewels and gemstones, such as, for example, zirconia or glass gemstones (glass blocks).
    The object of the present invention is to avoid the disadvantages known from the prior art and to provide an improved arrangement for analyzing a light pattern caused by refraction and reflection on a gemstone or an improved method for this, in which the arrangement according to the invention is used, provide.
    This object is solved by the features of independent claims 1 and 11.
    One of the central ideas of the present invention is therefore that the arrangement comprises a semitransparent optical element for deflecting the light emanating from the light source in the direction of the gemstone and transmission of refracted and reflected light on the gem stone, wherein it is in the semipermeable optical element for Example can be a semi-transparent mirror or a glass plate. 3/14 • *
    73819 31 / fr
    One of the main differences compared with the prior art is therefore that the light is coupled in via a semitransparent optical element. In this way it is possible to arrange the elements of the arrangement more flexible and in this way to avoid the disadvantages known from the prior art:
    For example, the holder device for holding the gemstone and the light source for illuminating the gemstone can be arranged on the same side of the scattering screen. This has the advantage that no hole in the diffuser must be provided to illuminate the gem. At the same time, space is also created for a substantially vertical arrangement of the camera for receiving the light pattern imaged on the scattering screen relative to the diffusing screen. For this purpose, provision may be made for the camera to be arranged on the side of the scattering screen opposite the mounting device and / or for the screen to be a transmission screen. Such an arrangement of the camera with respect to the scattering screen, it is possible to choose the distance of the camera to the diffuser so that lenses can be used, which have no or only very low perspective distortions of the imaged light pattern result. In addition, information loss can be avoided altogether, since there is no need to arrange between the camera and the diffuser elements that affect the clear view of the camera on the diffuser screen.
    The apparent disadvantage of using an additional optical element in the form of a semitransparent optical element (each optical element is always associated with more or less pronounced aberrations) is thus more than offset by a number of advantages.
    In an advantageous embodiment of the arrangement according to the invention, the holding device is arranged at a distance of between 10 cm and 50 cm, preferably at a distance of approximately 30 cm from the spreading screen. 4/14 73819 31 / fr • · · ·
    Furthermore, it has proven to be advantageous that the camera comprises a CCD chip, and / or that the light source is an LED light source.
    The light emanating from the light source is preferably unpolarized, and / or has a beam diameter between 5 mm and 15 mm, preferably a beam diameter of approximately 10 mm, and / or is collimated, and / or has a divergence half angle between 0.1 ° and 0.4 °, preferably a divergence half angle of about 0.25 °, and / or has a spectrum with a plurality of different wavelengths from the range of visible light. The latter manifests itself in the fact that the gemstone is essentially illuminated with white light, which is partially decomposed by the refraction of the gemstone into its spectral colors, so that the light pattern shown on the diffuser partially comprises colored light reflections.
    Preferably, it is also provided that the arrangement according to the invention comprises an evaluation unit, preferably a computer, for evaluating the light pattern received by the camera, and / or that at least the light source, the mounting device, the diffusing screen, the camera and the semitransparent optical element in one Device for the suppression of background light are arranged. By the latter measure, the signal-to-noise ratio can be significantly improved.
    As mentioned at the outset, protection is also desired for a method for analyzing a light pattern caused by refraction and reflection on a gemstone by means of an arrangement according to the invention, the method comprising the following method steps: holding the gem to be analyzed in the holding device, illuminating the gem by means of Light source and recording of the light pattern imaged on the diffuser by means of the camera.
    In a particularly preferred embodiment of this method, it is provided that the method steps 2 and 3 at least once with a different exposure time and / or with a different intensity and / or with a different polarization (in the case that polarized light 5/14 73819 31 / fr 0 0 0 0 0 0 0 0 ·· 0 • 0 0 · 0 0 · · · 0 ··· · · · * 000 00 5 * 0 000 00 * · · 00 00 · ··· · used) be repeated. Consequently, it is then possible - if the evaluation of the light pattern recorded by the camera by means of the evaluation unit is included as a further method step - from at least two light patterns recorded at different exposure times and / or intensities and / or polarizations an HDR image with an increased To generate information content.
    Finally, it has proved to be advantageous to compare the light pattern recorded by the camera with at least one light pattern stored in the evaluation unit, wherein the stored light pattern is preferably a simulated light pattern. In this way, for example, deviations from an ideal cut of the gemstone can be detected.
    Further features and advantages of the present invention will become apparent from the figures and the following description of the figures. It shows
    1 shows a preferred embodiment of the arrangement in a schematic representation,
    Fig. 2 by way of example by refraction and reflection on a
    Gemstone caused and on the screen scattered light pattern in a simplified schematic representation and Fig. 3 is a flowchart for schematically illustrating a preferred embodiment of the method according to the invention.
    The preferred embodiment of the inventive arrangement 1 shown in FIG. 1 for analyzing a light pattern caused by refraction and reflection on a gemstone comprises a light source 4 for illuminating a gemstone 2 held in a holding device 5. The light source 4 used is an LED light source. The outgoing light from the light source 4 - the corresponding optical axis is provided with the reference numeral 9 - is unpolarized, has a beam diameter of about 10 mm, is collimated and has a Divergenzhalbwinkel of about 0.25 ° and a spectrum with a Variety of different wavelengths from the 6/14
    Visible light area. Due to the size of the beam diameter, most commercially available gemstones can be completely illuminated.
    The light 9 emanating from the light source 4 initially strikes at an angle on a semitransparent optical element 8 in the form of a semitransparent mirror and is reflected at the surface of the semitransparent optical element 8 facing the light source. More precisely, a deflection of the light takes place in the direction of the gemstone 2. A part of the incident on the gemstone 2 light is reflected immediately in the direction of scattering screen 6. The remaining - much larger - part of the light enters the gemstone 2 is broken there and undergoes total reflections on the surfaces of the faceted gemstone 2, until it finally exits the gemstone 2 in the direction of scattering screen 6 again. Of course, a part of the light also leaves the gemstone 2 in a direction away from the litter shield 6 and is thus "lost" with regard to the light pattern.
    The broken and reflected light 10 emanating from the gemstone 2 to be analyzed-indicated by the dashed lines-passes in transmission the semitransparent optical element 8 and then strikes the diffusing screen 6, on which a scattering pattern characteristic of the type of gemstone 2 is imaged. The distance between the holder device 5 and thus (in about the middle) of the gemstone 2 to the diffusing screen 6 is about 30 cm.
    As can be seen from the structure of the arrangement 1 shown in FIG. 1, the holding device 5 and the light source 4 are arranged on the same side of the scattering screen 6.
    The scattering screen 6 is a transmission screen, that is to say that the light pattern depicted on the scattering screen 6 is also visible on the side of the scattering screen 6 facing away from the mounting device 5. In this way it is possible to record the light pattern imaged on the scattering screen 6 by means of a camera 7 which is arranged on the side of the scattering screen 6 opposite the mounting device 5. Moreover, it is also possible, the camera 7 in its longitudinal extent substantially perpendicular 73819 31 / fr .. · Align to the diffuser screen 6, which is indicated by the dot-dash line. The camera 7 is a CCD camera with a corresponding CCD chip.
    The light source 4, the holding device 5, the diffusing screen 6, the camera 7 and the semitransparent optical element 8 are arranged in a background light suppression device 13, the walls of this device 13 having a black, matte surface.
    The camera 7 is connected to an evaluation unit 12 in the form of a computer via a suitable data line 15, which may also be wireless.
    Figure 2 shows in a black and white representation of an example caused by refraction and reflection on a gemstone and imaged on the diffuser light pattern 3. This light pattern 3 is composed of individual light spots 16, these light spots 16 for each gemstone characteristic of refraction and Reflection generated. It should be noted that the image shown in FIG. 2 is a false color image with inverted brightness. The white areas are in fact black, meaning that no light is coming in, and the dark areas are those areas of the diffuser where light hits. Due to the simplified black-and-white representation, it is likewise not apparent that the light spots 16 have, in part, a color progression that is similar to the decomposition of white light through a prism. It should also be noted that the light spots 16 may have a different brightness. In English-language literature, such a light pattern of a gemstone is often referred to as a "fire".
    FIG. 3 shows a preferred embodiment of the method 14 according to the invention with reference to a flowchart. In a first step i. a gem to be analyzed is held in the fixture. In a subsequent process step ii. the lighting of the gem is done by means of the light source. In a third process step iii. the light pattern imaged on the diffuser is recorded by means of the camera. The process steps ii. and iii. are then repeated with a row, for example 8/14 ten, different exposure times, shinging example, from about 60 ms to about 16000 ms, that is, several successive patterns of light are recorded by the camera, which arise at different exposure times.
    In a further method step iv. the evaluation of the light pattern recorded by the camera takes place by means of the evaluation unit. For this purpose, first an HDR image (high dynamic range) is generated from the light patterns recorded at different exposure times and then compared with a light pattern stored in the evaluation unit, which is a simulated light pattern. On the basis of this comparison, conclusions can be drawn on the quality of the gemstone.
    Innsbruck, 22nd August 2013
    权利要求:
    Claims (15)
    [1]
    «· · · ·····································································································. 1. A device for analyzing a light pattern (3) caused by refraction and reflection on a gemstone (2), comprising - a light source (4) ) for illuminating the gemstone (2), - a holding device (5) for holding the gemstone (2), - a, in particular flat, scattering screen (6) for imaging the light pattern (3) and - a camera (7) for receiving the on the diffusing screen (6) illustrated light pattern (3), characterized in that the arrangement (1) a semitransparent optical element (8) for deflecting the light source (4) emanating light (9) in the direction of the gem (2) and Transmission of the gemstone (2) refracted and reflected light (10).
    [2]
    2. Arrangement (1) according to claim 1, characterized in that it is the semi-transparent optical element (8) is a semi-transparent mirror or a glass plate.
    [3]
    3. Arrangement (1) according to claim 1 or 2, characterized in that the holding device (5) and the light source (4) are arranged on the same side of the scattering screen (6).
    [4]
    4. Arrangement (1) according to one of claims 1 to 3, characterized in that the camera (7) is arranged on the holding device (5) opposite side of the diffusing screen (6) and / or substantially perpendicular to the diffusing screen (6). is aligned and / or it is at the scattering screen to a transmission screen.
    [5]
    5. Arrangement (1) according to one of claims 1 to 4, characterized in that the holding device (5) at a distance (11) between 10cm and 10/14 ·· · · «004 · · · · · · · · · · · · · · · · · · · ······ preferably at a distance (11) of approximately 30 cm, from the diffusing screen (6) is arranged.
    [6]
    6. Arrangement (1) according to one of claims 1 to 5, characterized in that the camera (7) comprises a CCD chip.
    [7]
    7. Arrangement (1) according to one of claims 1 to 6, characterized in that it is the light source (4) is an LED light source.
    [8]
    8. Arrangement (1) according to one of claims 1 to 7, characterized in that the light source (4) outgoing light (9) - is unpolarized, and / or - a beam diameter between 5mm and 15mm, preferably a beam diameter of in about 10mm, and / or - is collimated, and / or - has a divergence half angle between 0.1 ° and 0.4 °, preferably a divergence half angle of about 0.25 °, and / or - a spectrum with a Has a variety of different wavelengths in the range of visible light.
    [9]
    9. Arrangement (1) according to one of claims 1 to 8, characterized in that the arrangement (1) comprises an evaluation unit (12), preferably a computer, for evaluating the light pattern (3) received by the camera (7).
    [10]
    10. Arrangement (1) according to one of claims 1 to 9, characterized in that at least the light source (4), the holding device (5), the scattering screen (6), the camera (7) and the semitransparent optical element (8) are arranged in a device (13) for the suppression of background light.
    [11]
    11. Method (14) for analyzing a light pattern (3) produced by refraction and reflection on a gemstone (2) by means of an arrangement 11/14

    (1) after a... of claims 1 to 10, comprising the following method steps: i. Holder of the gem to be analyzed (2) in the mounting device (5), ii. Illumination of the gem (2) by means of the light source (4) and iii. Recording of the light pattern (3) imaged on the diffusing screen (6) by means of the camera (7).
    [12]
    12. The method (14) according to claim 11, wherein the method steps ii. and iii. be repeated at least once with a different exposure time and / or with a different intensity and / or with a different polarization.
    [13]
    13. Method (14) according to claim 11 or 12, wherein the evaluation of the light pattern (3) picked up by the camera (7) by means of the evaluation unit (12) is included as a further method step (iv.).
    [14]
    14. Method (14) according to claim 13, wherein an HDR image is generated from at least two light patterns recorded at different exposure times and / or intensities and / or polarizations.
    [15]
    15. Method (14) according to claim 13, wherein the light pattern (3) recorded by the camera (7) is compared with at least one light pattern deposited in the evaluation unit (12), wherein the stored light pattern is preferably a simulated light pattern Light pattern acts. Innsbruck, 22nd August 2013 12/14
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    WO2015027252A1|2015-03-05|
    US20160161421A1|2016-06-09|
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    CN105492893A|2016-04-13|
    WO2015027252A8|2016-04-07|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA659/2013A|AT514332B1|2013-08-27|2013-08-27|Arrangement for analyzing a light pattern caused by refraction and reflection on a gemstone|ATA659/2013A| AT514332B1|2013-08-27|2013-08-27|Arrangement for analyzing a light pattern caused by refraction and reflection on a gemstone|
    EP14747798.8A| EP3039411A1|2013-08-27|2014-06-30|Assembly for analyzing a light pattern caused by refraction and reflection at a precious stone|
    CN201480047199.1A| CN105492893B|2013-08-27|2014-06-30|For analyzing the device of light pattern caused by by reflecting and reflecting on jewel|
    PCT/AT2014/000134| WO2015027252A1|2013-08-27|2014-06-30|Assembly for analyzing a light pattern caused by refraction and reflection at a precious stone|
    JP2016537042A| JP2016529498A|2013-08-27|2014-06-30|Assembly for analyzing light patterns generated by refraction and reflection at gems|
    IL243951A| IL243951A|2013-08-27|2016-02-04|Assembly for analyzing a light pattern caused by refraction and reflection at a predcious stone|
    US15/040,338| US9702825B2|2013-08-27|2016-02-10|Assembly for analyzing a light pattern caused by refraction and reflection at a precious stone|
    JP2018102693A| JP2018141807A|2013-08-27|2018-05-29|Assembly for analyzing light pattern caused by refraction and reflection at precious stone|
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