• 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:
    The invention relates to a device for optically scanning a longitudinally moved fiber strand (5, 15, 25), in particular a yarn, wherein a light source (1, 11, 21) is designed to emit light rays in the direction of the fiber strand (5, 15, 25). to emit, and at least one sensor (7, 17, 27) is adapted to detect the light influenced by the yarn, wherein in the beam path of the light between the fiber strand (5, 15,25) and the at least one sensor (7, 17 , 27) a surface-half lens arrangement of a plurality of lenses (4, 14, 24) arranged in a plane is positioned such that the plane is penetrated by the light beams.
    公开号:BE1018411A3
    申请号:E2009/0476
    申请日:2009-08-06
    公开日:2010-10-05
    发明作者:Olav Birlem
    申请人:Oerlikon Textile Gmbh & Co Kg；
    IPC主号:
    专利说明:

    Device for optically scanning a longitudinally moved
    fiber strand
    Description:
    Device for optically scanning a longitudinally moved fiber strand
    The invention relates to a device for optically scanning a longitudinally moved fiber strand, in particular a yarn, wherein a light source is adapted to emit light rays in the direction of the fiber strand, and at least one sensor is adapted to detect the light influenced by the yarn.
    DE 10 2004 053 735 discloses a generic device. The illustrated device is embedded in a housing having a measuring slot through which the yarn to be scanned is guided. The yarn is irradiated by a light source, here by a white light diode. Between the light source and the yarn elements for transmitting the light are arranged. Such elements are, for example, diaphragms and lenses, which are arranged one after the other in the beam path. To protect these elements and the light emitting diode, a glass pane is still arranged towards the measuring slot. The device further comprises two photodiodes serving as sensors for measuring the light reflected by the yarn. The photodiodes are preceded by a glass plate and elements for transmitting the light according to the light source. Another correspondingly constructed sensor is arranged to measure the light transmitted by the yarn.
    The yarn has only a small surface, so that the measured signals detected by the sensors experience only minor changes by the yarn or by changing the yarn texture. Therefore, it is endeavored to capture the light influenced by the yarn as completely as possible and to avoid the measurement result distorting interference as far as possible. The interference generates parasitic signals that deteriorate the ratio of useful signal to total signal.
    To improve the ratio of useful signal to total signal essentially two measures are proposed. On the one hand, a diaphragm and a lens are arranged in the beam path behind the light source so that the diaphragm is imaged at least approximately at infinity. This measure produces approximately parallel light. The yarn is thus optimally illuminated, and the scattering of the light before impacting the yarn is at least reduced. Furthermore, in each case a lens is arranged and formed in front of the receivers for reflected light such that in the absence of the yarn, images on the opposite wall of the measuring gap can be detected which lie on both sides outside the image of the light source on the opposite wall of the measuring gap. This measure prevents light reflected on the wall from falling on the reflected light receivers, thereby degrading the signal-to-noise ratio.
    However, the measures described for improving the beam path have no influence on what proportion of the light influenced by the yarn is detected by the sensors or receivers. In addition, there is still interference, which falsifies the measurement result.
    It is therefore the object of the present invention to further improve the signal-to-noise ratio in the optical scanning of a longitudinally moved fiber strand.
    The object is achieved by the characterizing features of claim 1. Advantageous developments of the invention are the subject of the dependent claims.
    To solve the problem, a planar lens arrangement with a plurality of lenses arranged in a plane is positioned in the beam path of the light between the fiber strand and the sensor so that the plane is penetrated by the light rays.
    By arranging several lenses next to one another in a plane, the further course of the beam path can be influenced individually for each point of impact of the light influenced by the fiber strand on the lens arrangement. Depending on the distance and positioning of the impact point, the light influenced by the fiber strand strikes the planar lens arrangement at different angles. For each impact point or impingement area for which a separate lens exists, this lens can now be arranged and formed in such a way that the light beam influenced by the fiber strand is detected by the sensor. The beam path of the light can be better influenced the more lenses are used in the planar lens arrangement. Furthermore, the plane in which the lenses are arranged, or it may be the individual lenses arranged or designed so that interference rays as possible do not hit the sensor. Due to the possibilities of beam guidance through the planar lens arrangements, other elements of the device transmitting the light in the beam path of the light can be arranged such that the interfering beams do not reach the sensor or only to a lesser extent than the useful beams. Due to the possibilities of beam guidance by means of the lens arrangement according to the invention, the spatial extent of the arrangement of sensor, lenses and optionally other elements for transmitting the light, such as a diaphragm, can be reduced. Overall, the flexibility of the measurement setup is increased and the installation space of the device is reduced.
    In an advantageous embodiment of the invention, the lenses of the planar lens arrangement are designed such that the light beams are largely parallelized by means of the lens arrangement. The largely parallel light beams can then be bundled by means of a collecting lens arranged between the lens arrangement and the sensor. Advantageously, the sensor is arranged in the focal point of the converging lens. Due to the adaptability of the planar lens arrangement, the converging lens can be positioned almost anywhere.
    Advantageously, the planar lens arrangement reduces the divergence of the light influenced by the fiber strand. For this purpose, as already described, the light can be parallelized. It is also possible that the light is focused directly in a point in which the sensor is located by means of the planar lens arrangement.
    As a planar lens arrangement, microlens arrays can be used. Such microlensing systems are already available today and have hitherto been used, for example, in CCD sensors of digital cameras. Through the use of microlenses, it is possible to accommodate several thousand lenses on a square millimeter surface.
    The microlenses may, for example, be incorporated in a glass pane. Such a glass pane is not thicker than 0.5 mm and can replace the existing glass in the apparatus for optical fiber strands often anyway to protect the sensor. No additional space is needed for the planar lens arrangement.
    Alternatively, the microlenses can also be incorporated in a plastic film.
    The use of liquid microlenses with variable focal length opens up particularly efficient ways of influencing the radiation.
    The use of planar lens arrangements can improve the signal-to-noise ratio both in the measurement of the light reflected by the fiber strand and in the measurement of the light transmitted by the fiber strand.
    The invention will be explained in more detail with reference to embodiments shown in the drawings.
    Show it:
    1 shows a device according to the invention for optically scanning a longitudinally moved fiber strand with a sensor for measuring the light reflected by the yarn;
    2 shows a second embodiment of a device according to the invention;
    3 shows a third embodiment of a device according to the invention;
    Fig. 4 shows a device according to the invention with a
    Sensor for measuring the light transmitted by the yarn.
    1 shows a device according to the invention for optically scanning a longitudinally moved fiber strand 5.
    For the sake of clarity, only one light source 1 and one sensor 7 for detecting the light reflected by the yarn are shown here. Of course, arrangements according to the invention with multiple light sources or sensors are also possible. Accordingly, sensors for measuring the light transmitted by the yarn can also be present in the same arrangement. Behind the light source elements for transmitting the light are arranged, which are symbolized here by a lens 2. The emitted light rays pass through a glass sheet 3 and then hit the yarn 5. The light rays are reflected on the yarn 5 and then penetrate the
    Glass pane 3. A large number of microlenses 4, of which only a few are shown here by way of example, are incorporated in the glass pane. The glass sheet 3 forms the plane in which the lenses 4 are arranged. The microlenses are arranged and configured such that a parallel beam path results behind the glass pane or behind the plane in which the microlenses are arranged, and as many as possible meet the light rays reflected by the yarn 5 on the converging lens 6. The light rays which strike the center line 6a perpendicularly and are focused by the converging lens 6 are then detected by the sensor 7.
    Fig. 2 shows a second embodiment of the device according to the invention. Accordingly, the light rays of a light source 11 are collimated by a lens 12 and then impinge on the yarn 15. The light rays reflected from the yarn strike the glass sheet 13 with the microlenses 14. Compared to the embodiment shown in Fig. 1, the condenser lens 16 is different The collecting lens 16 is parallel to the glass sheet 13. Also in this embodiment, the microlenses 14 are adapted so that the light rays emerging from the glass sheet 13 are parallel to each other, perpendicular to the center line 16a of the condenser lens 16 meet and are focused by the converging lens 16 on the sensor 17. Due to the different positioning of the converging lens, a reduction of the interference radiation detected by the sensor 7 occurs in addition to the embodiment of FIG. The reference numeral 18 designates an interference beam which is reflected on the disk 13 before it hits the yarn. As a result of the selected positioning of the converging lens, the interfering beam 18 strikes the converging lens so that it does not strike the sensor 17 or at least greatly attenuates it. This advantageous positioning of the condenser lens is only possible by the upstream planar lens arrangement, which is formed in the embodiment as a plurality of microlenses.
    3 shows an embodiment in which a collecting lens is completely dispensed with. The microlenses 24 are integrated into the glass pane 23 in such a way that the light rays emitted by the light source 21, bundled by the lens 22 and reflected by the yarn 25, are collimated directly into the sensor 27 by the microlenses.
    4 shows a further variant of a device according to the invention. In this arrangement, the sensor 38 detects the light transmitted from the yarn 35. The element 32 for transmitting the light of the light source 31 is intended to parallelize the light beams. However, this is not fully achieved in practice. As indicated in Fig. 4, a divergence remains. The divergent light beams transmitted by the yarn strike the glass sheet 39. The microlenses incorporated in the glass sheet 39 concentrate the light in the sensor 38.
    权利要求:
    Claims (11)
    [1]
    1. A device for optically scanning a longitudinally moved fiber strand (5, 15, 25, 35), in particular a yarn, wherein a light source (1, 11, 21, 31) is adapted to light rays in the direction of the fiber strand (5, 15, 25, 35) and at least one sensor (7, 17, 27, 38) is designed to detect the light influenced by the yarn, characterized in that in the beam path of the light between the fiber strand (5, 15, 25) and the at least one sensor (7, 17, 27) is a planar lens assembly of a plurality of arranged in a plane lenses (4, 14, 24, 40) is positioned so that the plane is penetrated by the light rays.
    [2]
    2. Device according to claim 1, characterized in that the lenses (4, 14) of the planar lens arrangement are designed and arranged such that the light beams are largely parallelized by means of the lens arrangement.
    [3]
    3. Apparatus according to claim 2, characterized in that between the lens arrangement and the sensor (7, 17 a collecting lens (6, 16) is arranged, which concentrates the largely parallel light.
    [4]
    4. Apparatus according to claim 3, characterized in that the sensor (7, 17) in the focal point of the converging lens (6, 16) is arranged.
    [5]
    5. The device according to claim 1, characterized in that the planar lens arrangement is designed so that the divergence of the fiber strand (5, 15, 25, 35) influenced light is reduced.
    [6]
    6. Device according to one of claims 1 to 5, characterized in that are used as planar lens array microlens arrays.
    [7]
    7. Apparatus according to claim 6, characterized in that the microlenses (4, 14, 24, 40) are incorporated in a glass sheet.
    [8]
    8. The device according to claim 6, characterized in that the microlenses (4, 14, 24, 40) are incorporated in a plastic film.
    [9]
    9. Apparatus according to claim 6, characterized in that liquid microlenses are used with variable focal length.
    [10]
    10. Device according to one of claims 1 to 9, characterized in that the at least one sensor (7, 17, 27) from the fiber strand (5, 15, 25) measures reflected light.
    [11]
    11. The device according to one of claims 1 to 9, characterized in that the at least one sensor (38) from the fiber strand (35) transmits transmitted light.
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    同族专利:
    公开号 | 公开日
    CH699340A2|2010-02-15|
    CH699340B1|2013-01-31|
    DE102008037258A1|2010-02-11|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US5521395A|1993-04-02|1996-05-28|Zellweger Luwa Ag|Method and apparatus for determining the structure of yarns in the region of their surface|
    US5889593A|1997-02-26|1999-03-30|Kla Instruments Corporation|Optical system and method for angle-dependent reflection or transmission measurement|
    US20070205379A1|2006-03-02|2007-09-06|Chemimage Corporation|System and method for structured illumination and collection for improved optical confocality of raman fiber array spectral translator imaging and interactive raman probing|
    JPS5749673B2|1977-12-21|1982-10-23|
    CH668483A5|1985-12-17|1988-12-30|Zellweger Uster Ag|METHOD AND DEVICE FOR DETERMINING THE SURFACE STRUCTURE OF A LONG STRETCH TEST BODY, IN PARTICULAR FOR MEASURING THE HAIRNESS OF A YARN.|
    JP3611140B2|1995-07-20|2005-01-19|計測器工業株式会社|Yarn measuring device|
    DE19535177A1|1995-09-22|1997-03-27|Temco Textilmaschkomponent|Real time inspection, quality control of structure of high speed yarn|
    US5825501A|1997-03-14|1998-10-20|Lockheed Martin Energy Systems, Inc.|Structure and yarn sensor for fabric|
    DE19818069A1|1998-04-22|1999-10-28|Rieter Ag Maschf|System to register optical characteristics of yarn|
    DE102004026978A1|2003-07-29|2005-05-19|Mahlo Gmbh & Co. Kg|Process for evaluating and subsequently processing textile material strips comprises obtaining optical contact snapshots over the width of the moving textile material strips|
    DE102004053735A1|2004-11-06|2006-05-11|Saurer Gmbh & Co. Kg|yarn sensor|
    法律状态:
    2014-02-28| RE| Patent lapsed|Effective date: 20130831 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102008037258|2008-08-09|
    DE102008037258A|DE102008037258A1|2008-08-09|2008-08-09|Device for optical scanning of longitudinally moving fiber strand, particularly yarn, has light source that is designed to emit light in direction of fiber strand, and sensor|
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