• 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:

    公开号:AT510044A4
    申请号:T16672010
    申请日:2010-10-06
    公开日:2012-01-15
    发明作者:Robert Dr Koeppe
    申请人:Isiqiri Interface Tech Gmbh；
    IPC主号:
    专利说明:

    Title: Light Curtain »* * * t« · * * * *
    description
    The invention relates to a light curtain.
    A light curtain in the sense of this description is an optical monitoring device in which the principle of the light barrier is extended from a linear monitoring area to a planar monitoring area.
    Light curtains are formed in the simplest case by juxtaposition of parallel aligned light barriers. Reliable detection of an object as well as good detection of its position in the monitored area requires a large number of light sensors and light sources. Occasionally, light sources are used in which the cross-sectional surface of the emitted light beam has approximately the shape of a straight line. By aligning this line parallel to the alignment of the row formed by juxtaposition of light sensors, the lingering can be found with a smaller number of light sources than with light sensors.
    In EP 0 361 374 A2, it is proposed to form a light detector in which fluorescence radiation, which is formed in a light-permeable plastic doped with an organic fluorescent dye in the event of external light, is passed on to a photosensitive semiconductor element by means of optical waveguides which are likewise doped with a fluorescent dye becomes. This makes it possible to form cost-effective large-area detector elements, as would be possible with photosensitive semiconductor elements based on conventional semiconductor materials such as typically silicon.
    According to DE 34 41 498 C2 are doped with fluorescent material
    Strips of a translucent material such as glass or clear plastic are unilaterally connected to a photodiode and arranged side by side so that they form a larger detector surface.
    Page 1 • w · · · w · · · · ·
    Title: Light curtain within which individual areas can be measured individually, whether they are hit by light or not.
    In AT 507267 A1 and in AT 507702 A2, optical detector surfaces and applications therefor are described as control surfaces for data processing systems. In this case, the optical detector surfaces are constructed from one or more flat optical waveguides, to each of which at least one very small-area photoelectric sensor is mounted, wherein a layer of the optical waveguide has photoluminescent properties. The radiation of a light spot impinging on the detector surface is converted by photoluminescence into longer-wave light, which propagates in the planar optical waveguide, is attenuated with increasing distance to the light point and is coupled out and detected at the photoelectric sensors from the optical waveguide. Detector surfaces of this type can be flexible and handy, are inexpensive per surface and are well suited for fast signal processing of light signals. By taking into account the attenuation of the propagating in the waveguide light signal is using mathematical evaluation methods even with large detector surfaces with few tapping points a good spatial resolution in the determination of the Auftrefffortes a light spot possible. The application for a light curtain is not considered.
    DE 10 2005 040 351 B4 describes a detector in which a fluorescent material layer which hardly or not at all absorbs in the visible spectral region is applied to a flat, light-conducting substrate such as a glass pane which converts irradiated UV light into light which is present in the substrate is also conducted to its edge areas. At the edge regions of the substrate, optically coupled radiation sensors are attached to the substrate, which translate the light output arriving from the substrate into an electrical signal. From-
    Selze 2 t ♦
    Tital: Light curtain shading of the otherwise irradiated light causes a change in the electrical signal. The detector can be used as a very inconspicuous access control system for the space between the light source and the detector surface, which can be an existing glass sheet anyway. However, no more exact position can be detected.
    Among other things, in DE 2550653 B2 a light curtain for the monitoring of a room is described wherein a single, so-called rotational light source is applied. From a single light source while a light beam is emitted, however, the light source - or a mirror on which the light source lights - is rotated so that the light beam passes through a surface of the room in a certain cycle. On the strip of walls where the light beam strikes when there is no shading object in the room, the walls are provided with reflectors, namely with inverted reflectors or plane mirrors, so that the light beam is reflected back either directly or indirectly to the light source. In the vicinity of the light source is also a light sensor. If no light is reflected back, this is an indication that a shading object is located between the light source and the otherwise illuminated reflector area. You can find the way to monitor a room with a single light source and a single light sensor. The disadvantage is that surveillance is "tricked" by specular objects. can be that a good spatial resolution is often hardly possible and that the necessary reflective stripes on the walls of the room often interfere.
    The object underlying the invention is to provide a light curtain through which the fact of the presence of an object, as well as the size and position of the object can be detected in real time in two dimensions within a surface to be monitored. Opposite known light curtains * *
    Title: Light curtain for this purpose, the newly created light curtain should work more robustly with higher speed and better spatial resolution and still be realizable by means of a smaller number of overall cost-effective individual parts.
    To solve the problem, it is assumed that a function similar to DE 2550653 B2 mode of operation. The area to be monitored is repeatedly swept from a light source by a collimated ("collimated") light beam, measuring the power of the light traversing the surface and knowing the time course of the direction of the light beam. A shading of the light beam by an object located in the area to be monitored causes a reduction in the measured light output. By also the angle of rotation of the causing light beam is known at the time of a reduction or increase of the measured light power, the angular coordinates of the shadow edges of a shading object located in the surface to be monitored are measurable in the circumferential direction of the rotational movement of the light beam.
    According to the invention, an optical detector surface is provided for measuring the power of the light beam at the edge of the surface to be monitored, which generates an electrical signal as a function of the power of the incident laser light, wherein the detector surface is a planar optical waveguide in which photoluminescent particles are integrated and to which are mounted one or more photoelectric sensors capable of coupling light out of the waveguide mode to thereby generate an electrical signal whose magnitude depends on the power of the coupled-out light.
    The detector surface described is inexpensive over a large area, or can be produced as a long strip and it can be measured very quickly, so that a high spatial resolution can be achieved. It is not necessary to read the signals of many photoelectric sensors.
    Page 4 k * *
    It is sufficient to measure the sum signal of all the photoelectric sensors per detector together, since the location of a shadow boundary is known anyway by knowing the direction of the associated light beam at the time of a fluctuation of the sum signal.
    The invention is illustrated by means of three drawings:
    Fig. 1: shows a schematic diagram of an inventively monitored surface from above.
    Fig. 2 shows by way of example the essential elements of a game-like light source as it can be applied to a light curtain according to the invention.
    Fig. 3: shows a cross-sectional view of one as elongated
    Strip formed detector surface, which can be applied to a light curtain according to the invention.
    Fig. 4: shows the time course of the result of the measurement mea sured by a light source light output.
    According to FIG. 1, a light source 1 is arranged at two mutually diagonally opposite corners of a rectangular surface to be monitored, each emitting a collimated light beam 2, the direction of the light beam 2 -as indicated by the curved arrows-being continuously rotated.
    The boundaries of the surface to be monitored are formed by four walls in the example sketched in FIG. At each of the walls in the height of the surface to be monitored in each case a strip 3 of a detector surface is mounted, through which the power (intensity integrated over the cross-sectional area) of the incident light beam 2 can be measured.
    In the area to be monitored, an object 4 is arranged, which shadows in each case a partial area 5.1 or 5.2 against a respective light source 1 from two detector surfaces 3.
    Page 5 * *
    Title: Light curtain
    According to FIG. 2, a laser light source 1. 1 emits a laser beam 2 vertically downwards onto a mirror 1. 2, which is arranged on the front side at the upper end of a vertically aligned stub shaft of an electric motor 1. 3 and whose plane is inclined by 45 ° relative to the horizontal. By rotating the shaft of the electric motor 1.3 about its vertical axis so that the mirror 1.2 rotates about this vertical axis and the direction of the light beam 2 rotates equally in a horizontal plane.
    The exemplary detector surface 3, which is shown by way of example in FIG. 3 (not to scale) as an elongated strip, comprises two cover layers 3.1 made of PET approximately 0.1 mm thick, between which a layer 3.2 of approximately 0.001 mm thick is composed of a homogeneous mixture the plastic polyvinyl alcohol and the dye rhodamine 6G is laminated. The layer 3.2 is photoluminescent. It is so strong that its absorption for normally incident 532 nm wavelength light is over 80%. (The required layer thickness is best determined by experiment). If a light spot with a suitable spectrum strikes the layer 3.2 through the light beam 2, it triggers photoluminescence on the dye particles of the layer 3.2. This results in diffusely scattered, long-wave light. According to the known underlying principle of operation of the optical waveguide it propagates in the transparent layers 3.1 and remains essentially in these layers, since it at the interfaces to the environment (air) or support layer 3.3 due to the different refractive index in the material of Layers 3.1 is reflected back.
    By way of example, at a distance of 5 cm from each other, photodetectors 3.4 typically formed as silicon photodiodes along the longitudinal direction of the detector surface can assume a cross-sectional area of approximately 2.times.2 mm.sup.2 on the side of the PET layer 3.1 facing away from the layer 3.2 mounted so that they couple out light from the PET layer and couple to their pn junction. There-
    page 6
    Title: Light curtain by an electrical signal is generated at the pn junction in the form of a voltage or a current. This electrical signal is conducted via a two-pole line 3.5 to a connection point to the detector surface 3 and fed to further processing. For the present application, it is sufficient to consider the sum signal of all photodetectors 3.4 of a detector surface 3 and not the individual signals of each photodetector 3.4. Thus, for example, all photodetectors 3.4 formed by photodiodes can be connected in parallel to one detector surface and the common short-circuit current can be measured. This short-circuit current is largely proportional to the light output coupled out of the waveguide mode at the individual pn junctions.
    FIG. 4 shows, by way of example, the sum signal of the light detection at two adjoining boundary lines of the surface to be monitored, the two boundary lines being illuminated by the same light source 1 (see FIG. 1). At time t0, the light beam 2 radiates to the beginning of the detector strip on the first wall; a power P is measured. At the time ti, the light beam reaches the shading 4 (Fig. 1); the measured power drops (almost) to zero. At time t2, the light beam again emerges from the shading; the measured power rises back to normal. At time t3, the light beam reaches the end of the detector strip on the second wall and thus the end of the measuring range for the light beam from the one light source 1; the measured power drops back to zero and remains at this value until the run starts again from the time t = t0 + T. The period of time T is the period within which the direction of a light beam continues to rotate by one revolution. By way of the equation α = <o.t where <o is the angular velocity of the change in direction of the light beam 2, exactly one angle α of the light beam in the surface to be monitored is associated with each time point t. From the exact times of the off and
    Page 7
    Title: Light Curtain again Starting the signal, an evaluating controller can thus close the exact positions of the shadow borders on the detector. This closes the position as well as the approximate outlines of the shading object.
    It makes sense to assign the angles α = 0 to the times tQ, t0 + T, t0 + 2T... In a superordinate control, and thus to recalibrate the angle measurement with each passage of the light beam. The angles t1 and t2, which mark the boundaries of shadowing 5.1, 5.2 by an object 4, thus define a sector within which the shading object must be located.
    By using a plurality of light sources 1 (FIG. 1) arranged at a distance from one another, the shading object can be located more precisely and can be more accurately recognized in its shape, since there must be a plurality of such sectors in the overlapping region 6.
    The mirror 1.2 can typically be fixed at a fixed frequency of e.g. Rotate 1kHz. The calibration of the angular position in each pass can be realized for example by a light barrier, which is interrupted or transmitted once per revolution by an object attached to the motor 1.3, thereby sending a signal to the evaluating control, by which a certain angular position of the motor 1.3 and so that the mirror 1.2 and thus the direction of the beam 2 is characterized.
    In order to avoid interference signals to detector surfaces by unrelated light sources 1 and to increase the life of the laser light sources 1.1 used, it is advantageous that the laser light sources 1.1 during the passage of the mirror 1.2 by an angular range on the not measured anyway (as shown in FIG. 4 between the Times t3 and to + T) off.
    When using two light sources 1 and at a rotation frequency of 1 kHz, one shading object per millisecond
    Seitc 8 • M 4 «
    Title: Light Curtain • ······························································································································································································································ and to narrow down its approximate contour.
    When using the sensor surfaces 3 according to the invention can be useful to work with a read rate of 20 MHz from the sensor surfaces. Thus fall per light source and sweeping the associated sensor surface area about 5000 measurement results. Depending on the size of the area to be monitored, the spatial resolution of the shadow detection lies in the millimeter range to sub-millimeter range. Thus, in a room of conventional size (for example 20 m2), a plurality of objects whose size can be in the centimeter range can be easily identified and localized without difficulty.
    As modifications to the described embodiment may be mentioned: For the deflection of the direction of the light beam is not necessary to use an electromechanical device. It is also possible to use electro-optical elements. This caused small changes in angle of a light beam can be amplified by a curved mirror. In contrast to the described use of an electric motor, the noise prevention can thus possibly be improved and the service life increased.
    The same can be achieved by adjusting the mirror by means of a piezoelectric effect and additionally amplifying the deflection of the light beam by means of a curved mirror. It is also possible to combine electro-optical elements and piezo-adjustment of a mirror and, if necessary, to additionally connect a curved mirror along the path of the light beam.
    The light of the laser light sources 1.1 can be flashed quickly in a fast frequency and from the measured signal only
    Page 9 * m 9 9 ·· * «» * 9 ·
    Title: Light curtain filter out this frequency. This allows background light to be filtered out well.
    Especially if the outlines of a shading body should be more accurate than in the example sketched in FIG. 1, it makes sense to use more than two light sources 1, which are spaced apart preferably to be arranged at the edge of the surface to be monitored. It is then important to note that, in the case of indistinguishable light sources, only one light source may illuminate a detector surface at a time, since otherwise the signals coming from a detector surface are ambiguous in their statement concerning shadow boundaries. By a higher-level control, therefore, a light source should always be switched off when its light beam would be directed to such a detector surface on which the light beam of an activated light source is already directed at the time. Of course you can also use several shorter detector strips and let on each strip only a single light source shine anyway. Likewise, one could use light sources in which the intensity of the light varies with a particular characteristic frequency for the individual light source. From the detection results it is then possible by frequency filtering to identify which light source was causing.
    By placing the surface to be monitored by the light curtain horizontally above a floor surface, movement of persons or objects on the floor surface can be well monitored and recorded. The light curtain according to the invention is so robust and fast and has a sufficiently high resolution that, for example, the positional changes of all football players on a football field during a football match can be followed.
    Due to its speed and accuracy, the light curtain according to the invention is also very suitable for monitoring tasks in and on machines. Likewise, he can act as a position
    Page 10 • ♦ • ♦
    «&Gt; tl ι * * «« »· * * · · I (
    Title: Liehtvorhang detector in a control loop for controlling the movement of an object to detect the movements of the object to be controlled and report.
    Last but not least, the light curtain according to the invention can also be used as an input device for a data processing system, similar to a touchpad. For this purpose, detector surfaces and light sources are arranged on a raised edge border of an input surface, which may be a screen or a projection surface, or also the back side of a translucent projection surface. The result of the position detection can be interpreted and used in the data processing system as the cursor position of an input mouse. It is thus easily possible to locate in real time the position of several as touching fingers or pointing devices; the function is independent of the state of the surface to be touched.
    Side left
    权利要求:
    Claims (13)
    [1]
    1. Light curtain for the optical detection of shading objects in a surface to be monitored, wherein the surface to be monitored from a light source through a collimated, changeable in his direction Light beam is repeatedly swept, the power of the light traversing the surface is measured, closed by an evaluating control of the time course of the measured power with knowledge of the time course of the direction of the light beam on the shadow boundaries and thus the position and size of a shading object Is characterized in that for measuring the power of the light passing through the surface at the edge of the surface to be monitored, an optical detector surface {3) is arranged, through which the power of the light beam (2) emitted by a light source (1) is measurable, wherein the optical detector surface (3) ei n is a planar optical waveguide in which photoluminescent particles are integrated and to which one or more photoelectric sensors (3.4) are mounted, which are able to extract light from the waveguide mode and thereby generate an electrical signal whose magnitude differs from that of the decoupled light is dependent.
    [2]
    2. Light curtain according to claim 1, characterized in that of several photoelectric sensors (3.4) of the optical detector surface (3), the electrical sum signal can be read out and fed to the evaluating controller.
    [3]
    3. Light curtain according to claim 2, characterized in that a plurality of photoelectric sensors (3.4) of the optical detector surface (3) are connected in parallel to each other at common connection lines (3.5). Page 12 * * (i t i «Title: Light Curtain
    [4]
    4. Light curtain according to one of claims 1 to 3, characterized in that for the change in direction of the light beam 2 electro-optical elements and / or a piezoelectric effect in its position variable mirror is provided and that these elements and / or this mirror on the path of the light beam a mirrored mirror with a curved surface, by which an angular change of the incident light beam is increased.
    [5]
    5. Light curtain according to one of claims 1 to 3, characterized in that for the direction change of a laser light source (1.1) outgoing light beam (2) a mirror (1.2) is provided, on which the light beam of the laser light source (1.1) is aligned and which is drivable by a drive (1.3) to uniform rotation.
    [6]
    6. Light curtain according to claim 5, characterized in that the angular position of the drive (1.3) and / or the mirror (1.2) is measurable at least once per revolution.
    [7]
    7. Light curtain according to claim 5 or claim 6, characterized in that the rotating mirror (1.2) is arranged on an edge of a surface to be monitored and that the laser light source (1.1) during each rotation of the mirror (1.2) in a definable angular segment of the position of the mirror (1.2) is switched off and after running through this segment is switched on again.
    [8]
    8. Light curtain according to one of claims 1 to 7, characterized in that a plurality of mutually spaced laser light sources (1.1) are arranged on the surface to be monitored and that the laser light sources (1.1) are individually switched off by a controller whenever they would turn on a detector surface in the on state, on which at this time already another laser light source is actually lit. Page 13 Title: Light Curtain

    • * ΰ - S ^ tlTi * · 4 I ♦ * · + * *
    [9]
    9. Light curtain according to one of claims 1 to 8, characterized-indicates that the surface to be monitored is arranged horizontally above a floor surface and that movements of persons or objects are monitored on the floor surface by the light curtain.
    [10]
    10. Light curtain according to claim 9, characterized in that so that position changes are tracked by athletes on a field.
    [11]
    11. Light curtain according to one of claims 1 to 8, characterized in that so that monitoring tasks are performed in and / or on machines.
    [12]
    12. Light curtain according to one of claims 1 to 8, characterized in that it is used as a signaling element in a controlled system for the movement of an object.
    [13]
    13. Light curtain according to one of claims 1 to 8, characterized in that it is used as an input device to a data processing system, including the area to be monitored by it is arranged over an input surface, to which by a finger or a stylus or a similar object by the area to be monitored must be typed for input to the data processing system. Page 14
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    同族专利:
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2015089536A3|2013-12-19|2015-08-13|Isiqiri Interface Technologies Gmbh|Automatically adjustable light curtain|US4106218A|1975-06-25|1978-08-15|The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration|Simulator method and apparatus for practicing the mating of an observer-controlled object with a target|
    DE2550653C3|1975-11-11|1978-12-21|Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch|Rotating beam light curtain|
    DE3441498C2|1984-11-09|1989-03-02|Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt, De|
    DE3832803A1|1988-09-28|1990-03-29|Hoechst Ag|LIGHT DETECTOR|
    US5070237A|1989-05-16|1991-12-03|Asahi Kogaku Kogyo K.K.|Optical measurement and detection system|
    US6333512B1|1998-07-15|2001-12-25|Alvin R. Wirthlin|Optical gauge for determining the level of a medium in a container|
    JP3527672B2|1999-12-28|2004-05-17|株式会社スクウェア・エニックス|Computer-readable recording medium recording a three-dimensional computer image processing program, shadow drawing processing method, and video game apparatus|
    EP1267143A1|2001-06-15|2002-12-18|European Community |Method and apparatus for optical position measurement|
    DE10312872A1|2003-03-22|2004-10-14|Nexpress Solutions Llc|Optical detector, for sensing position of object in detection region, has adjustable mirror to direct light from source to receiver and determines object position from interruption of light path|
    US7787347B2|2005-04-14|2010-08-31|Panasonic Corporation|Optical head device and optical information processor|
    DE102005040351B4|2005-08-25|2007-05-24|Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.|Radiation modules, arrangements containing them and methods for detection, control and monitoring|
    US7379194B2|2005-10-11|2008-05-27|Pitney Bowes Inc.|Method and system for determining mail piece dimensions using swept laser beam|
    US8094129B2|2006-11-27|2012-01-10|Microsoft Corporation|Touch sensing using shadow and reflective modes|
    AT507267B1|2008-07-15|2011-12-15|Isiqiri Interface Tech Gmbh|CONTROL PANEL FOR A DATA PROCESSING SYSTEM|
    CN102089736B|2008-07-15|2015-07-08|伊斯奇里因特菲斯技术股份有限公司|Control surface for a data processing system|
    CN201322807Y|2008-12-19|2009-10-07|上海波汇通信科技有限公司|Optical passive detection system|
    CN102272704B|2009-01-07|2014-04-23|伊斯奇里因特菲斯技术股份有限公司|Detector surface|
    CN101655566B|2009-09-15|2013-02-20|江苏汉武智能科技有限公司|Regional detection light curtain and detection method thereof|AT515132A1|2013-12-04|2015-06-15|Isiqiri Interface Tech Gmbh|Optical input surface|
    EP3404361B1|2017-05-18|2019-07-17|Leica Geosystems AG|Light receiver|
    法律状态:
    2017-06-15| MM01| Lapse because of not paying annual fees|Effective date: 20161006 |
    优先权:
    申请号 | 申请日 | 专利标题
    AT16672010A|AT510044B1|2010-10-06|2010-10-06|CURTAIN|AT16672010A| AT510044B1|2010-10-06|2010-10-06|CURTAIN|
    CN201180047554.1A| CN103140775B|2010-10-06|2011-09-28|Light curtain|
    US13/824,808| US9075156B2|2010-10-06|2011-09-28|Light curtain|
    EP11794618.6A| EP2625553B1|2010-10-06|2011-09-28|Light curtain|
    JP2013532013A| JP5877546B2|2010-10-06|2011-09-28|Light Curtains|
    PCT/AT2011/000398| WO2012045101A2|2010-10-06|2011-09-28|Light curtain|
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