• 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 light curtain which has a light source (3) which emits a light beam (4) which propagates in a surface (2) to be monitored by the light curtain and subsequently strikes an optical detector surface (6). The area to be monitored (2) is arranged in the vicinity of a translucent disk (2) and aligned parallel thereto. Light source (3) and detector surface (6) are arranged on the side facing away from the surface to be monitored (2) of the disc (1). The path of the light beam (4) from the light source (3) to the detector surface (6) passes twice through the plane of the disc (1) and two mirrors (5.1, 5.2), which at the edge of the surface to be monitored (2) are.
    公开号:AT510692A4
    申请号:T2892011
    申请日:2011-03-04
    公开日:2012-06-15
    发明作者:
    申请人:Isiqiri Interface Tech Gmbh；
    IPC主号:
    专利说明:

    »· • · • *
    File J 422
    Light curtain and an input device based thereon for a data processing system
    The invention relates to a light curtain and an input device based thereon for a data processing system.
    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 and also good detection of its position in the monitored area require a large number of light sensors and light sources. Occasionally, light sources are used in which the cross-sectional area 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 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 of one or more planar optical waveguides are constructed, to which in each case at least one very small-area photoelectric sensor is mounted, wherein a layer of the optical waveguide has photoluminescent properties. The radiation of an incident on the detector surface light spot is converted by photoluminescence in long-wave light, which propagates in the planar optical waveguide, thereby attenuated with increasing distance to the light spot and at the photoelectric sensors from the
    Page 1 " · • · " *
    File J 422
    Fiber optic cable is coupled out and detected. 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 AT 508 135 Bl describes a flat, intended for use on light curtains detector, which is formed as a flexible layer structure of organic material and generates electrical signals in response to absorbed light. The detector is provided with a plurality of tapping points for the generated signals, wherein the size of the signals at the individual tapping points depends on their distance to the partial areas at which the light is absorbed and wherein the size ratios between the signals at several tapping points Distance ratios of the respective tapping points to those sub-areas in which the light is absorbed, can be calculated. Several variants of applications for light curtains equipped with such a detector are shown.
    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. The walls are provided with reflectors, namely with inverted reflectors or plane mirrors, on the strip of walls where the light beam strikes when there is no shading object in the room, so that the light beam is either directly or indirectly approximately
    Page 2 " · " ·
    File J 422 is reflected back to the light source · There is also a light sensor in the vicinity of the light source.
    DE 197 23 974 A1 shows the principle described on the basis of DE 2550653 B2, for example for monitoring the window opening in a motor vehicle door in order to avoid that an object is clamped by the motor-driven sliding window.
    The object underlying the invention is to provide an effect principle for a light curtain, according to which in two dimensions within a surface to be monitored, the fact of the presence of an object, as well as the size and position of the object can be determined in real time, the monitoring surface in the vicinity and parallel to a translucent disc should be arranged. Compared to known, suitable implementation principles of light curtains should be feasible with the newly to be provided effect principle under economic conditions more robust functioning light curtains.
    According to the new principle, for example, touch-sensitive input surfaces (touch screen) for data processing systems should be feasible or it should thus be possible to detect the approach of objects from the outside to a window pane, typically to a shop window, in a spatially resolving manner. For solving the problem, it is assumed that a construction in which light is emitted by one or more light sources along the surface to be monitored, at the edge regions of the surface to be monitored the arrival of light is detected and in the case of non-arrival of light by geometric calculations on the location and size of a shading object, which penetrates the surface to be monitored, is inferred. According to the invention, it is proposed to arrange the light source (s) and detector surface (s) on the side of the pane facing away from the surface to be monitored, which is responsible for the function of the light side 3.
    File J 422
    Curtain light required twice through the disc and at the side of the disc, which is the surface to be monitored, to install at the edges of the surface to be monitored mirror.
    The invention is illustrated by means of a drawing:
    1 shows a schematic diagram of the parts essential for the understanding of the invention in a view in which the viewing direction is parallel to the surface 2 to be monitored.
    In the example according to FIG. 1, the area 2 to be monitored is arranged above the pane 1 and parallel to it.
    The light source 3 is typically a laser with line optics, ie a laser which emits a light beam 4 whose cross-sectional area is a line. The plane in which propagates the light beam 4 after its exit from the light source 3, is normal to the plane of the disc 1. The light beam 4 penetrates the disc 1, passes on the side facing away from the light source 3 to the mirror 5.1, whose plane is inclined to the plane of the disc by 45 ° and limits the surface to be monitored 2 at one edge. At the mirror 5.1, the light beam 4 is reflected, so that it propagates parallel to the plane of the disc 1. The area that he now covers is the surface 2 to be monitored.
    At a next mirror 5.2, which is also inclined to the disc by 45 ° and limits the surface 2 to be monitored at a further edge, the light beam 4 is deflected again so that it now passes through the disc 1 in the opposite direction a second time. Via a third mirror 5.3, the light beam finally arrives at an optical detector surface 6 designed as a strip, is absorbed there and causes an electrical signal, in each case at tapping points 7, which are arranged at a distance from one another on the detector surface.
    Page 4 • · • · • ·
    File J 422 sen size of the distance of the respective tapping point from the point of impact of a light pulse to the detector surface is dependent. The signals from the tapping points 7 are directed to an evaluating controller (not shown).
    When a shading object, such as typically a pen or a finger, projects through the surface 2 to be monitored against the pane 1, a portion of the cross-sectional area of the light beam 4 is shaded and adjacent to a longitudinal area of the detec tor 6 which was previously illuminated , then gets no light. At the tapping points 7, which are close to this longitudinal area, the measured electrical signal is reduced, which means that the evaluating control can infer the position of the shading object in the area 2 to be monitored.
    Due to the construction according to the invention, all electronic components can be arranged on one side of the disk 1. It also need no electrical lines to be guided to the side of the disc 1 at which there is the surface to be monitored. On the side of the surface to be monitored only mirror strips 5.1, 5.2 need to be mounted.
    The advantage of this arrangement is vivid, if one imagines the application of the light curtain on a shop window. The disk 1 is the shop window. There is no need to arrange any electronic parts or electrical cables outdoors. It is sufficient to arrange mirror strips 5.1, 5.2 outdoors. In the case of vandalism, only one mirror is to be replaced or cleaned. No electrical parts need to be designed for special weather conditions. Furthermore, no power or data cables need to be laid outdoors. This will make it possible to have an " interactive showcase " to realize, so a shop window on which one can change as a viewer from the outside by guiding the hand over the disc 1 settings that affect the area within the disc 1. (Lighting, various
    Page 5 • · · • t · · i * • · · # · · • * • · • «·· ♦ ·«
    File J 422 ben of displayed objects, turn on information movies. , , ,)
    In an advantageous embodiment, the detector 6 and the tapping points 7 are realized in accordance with the principle described at the outset with reference to AT 507267 A1 and AT 507702 A2. Accordingly, the detector surface 6 is formed from one or more planar optical waveguides and the tapping points 7 are in contrast very small-area photoelectric sensors. A layer of the optical waveguide has photoluminescent properties. The radiation of an impinging light pulse on the detector surface is converted by photoluminescence into long-wave light, which propagates in the planar optical waveguide, thereby attenuated with increasing distance to the light point and coupled out at the photoelectric sensors (tapping points 7) from the optical waveguide and detected.
    This makes it possible to realize flexible, handy, robust, cost-effective large-area or very long area detectors with high spatial resolution. For the application to shop windows but also to touchscreens, it is particularly advantageous for this sensor technology that it is not very sensitive to background light, since the detector surface can easily be adjusted so that only light of a particular wavelength triggers luminescence as intended. Good robustness against stray light can also be achieved in that the detection is very fast, which makes it possible to modulate the light beam 4 to be detected in its intensity with a specific, high frequency (in the MHz range) and only correspondingly modulated signals through filters to the controller. Especially when used in a shop window, the insensitivity to background light is very important, since the lighting conditions can change significantly during the day.
    In general, one will not use a single light source 3 and a single detector surface 6, but rather several at different
    Page 6 • ♦ ·· ♦ 9
    File J 422 those positions along the edge of the disc 1 arranged light sources 3 and also a plurality of detector surfaces 6, ideally as a frame around the disc. Thus, in the case of a shop window, the already existing expensive glass pane generally does not have to be removed when an inventive light curtain is installed afterwards.
    It is important that the detection results of the different light sources are distinguishable from each other, for example by different modulation frequencies or by phase-shifted pulsed emission of light pulses. The more different light sources are used, the more precisely one can narrow down the location and cross-sectional area of a shading object in the area 2 to be monitored, and the better one can distinguish between several simultaneously existing shading objects.
    Of course, as an alternative to using the luminescent waveguide principle for optical detection, it is also possible to use other measurement principles.
    For example, the detector surface 6 may be formed as an inactive surface whose image is taken by a camera - preferably a line scan camera. The reflection of the light beam 4 generates a bright line on the detector surface 6, which is recognizable on the image taken by the camera and can be evaluated in terms of data technology. (The image refresh rate is currently typically in the kHz range). Shading objects on the surface 2 to be monitored cause an interruption of this line. This can also be carried out in addition to the above-described measuring principle based on luminescence waveguide, since a part of the light generated in the luminescence waveguide is coupled out directly again, thus producing a bright line at the point of incidence of the light beam.
    Page 7 * 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9999 99 $ 9
    File J 422
    The mirror 5.3 shown in FIG. 1 can be omitted if the detector surface 6 is aligned at least parallel to the pane 1. The execution is thus simpler than the daxgestellt execution but may optically not so advantageous.
    Instead of using the light source 3 as a laser with line optics you can of course use a rotary light source, ie a light source which emits light beam with approximately point-shaped cross-sectional area, however, the direction of the light beam is constantly rotated, so that the light beam passes through a surface again and again. In particular, it makes sense to perform the curved mirror 5.1 and to move the light source 3 so that the light beam continuously sweeps over the entire surface. (Of course, it is also possible, when using a laser with line optics, to make the mirror 5.1 curved in order to amplify the expansion of the light beam in the longitudinal direction of the cross-sectional area of the light beam.)
    In the sketch of FIG. 1, the plane of rotation of the light beam 4 at the exit region from the light source 3 would be vertically normal to the plane of the disk 1 and would be visible in FIG. 1 as a line.
    In a further development of the invention, an object which emits shading in the surface 2 to be monitored can also be used as an object which itself emits light which can be measured via the detector surface 6. The light which is emitted by the device is in this case directed by the mirror strip 5.2 onto the detector surface 6 and detected there. For example, this device may be a light pen equipped with a light emitting diode pulsating at a predetermined characteristic frequency. By the fact that it is recognizable by the evaluating control that it is not a shadowing object but a very special shading device, this device and the shading caused thereby can
    Page 8 • ft • ft • ft ••• ft • ft • ft • ft • ft • ft ft ft ft m ft ft • ft • ftftft • ft ft ···
    File J 422 gen special functions are assigned. Typically, these can be more important permissions in a data processing system which is controllable by the light curtain according to the invention as a touch screen.
    Page 9
    权利要求:
    Claims (6)
    [1]
    1. A light curtain which has a light source (3) which emits a light beam (4) which propagates in a surface (2) to be monitored by the light curtain and subsequently to a light source Optical detector surface (6), characterized in that - the surface to be monitored (2) in the vicinity of a translucent disc (Ί) is arranged and aligned parallel to this, - that the light source (3) and the detector surface (6) the side of the pane (1) facing away from the surface (2) to be monitored, - that on two spaced-apart edge regions of the surface to be monitored (2) on the side of the disc (1) on the surface to be monitored ( 2), mirrors (5.1, 5.2) are arranged, whose reflection plane is inclined to the surface to be monitored (2), and - that the path of the light steel (4) from the light source (3) to the Detektorfl surface (6) passes twice through the plane of the disc (1) and over the two mirrors (5.1, 5.2).
    [2]
    2. Light curtain according to claim 1, characterized in that the light source (3) emits a light beam (4) whose cross-sectional area is a line.
    [3]
    3. Light curtain according to claim 1 or claim 2, characterized in that the detector surface (6) is formed from one or more planar optical waveguides, which are capable of converting incident radiation of the light beam (4) by photoluminescence in long-wave light, which propagates in the planar optical waveguide and that on the side of the detector surface (6) tapping points (7) are arranged which are formed by photoelectric sensors which generate an electrical signal from the light propagating in the optical waveguide.
    [4]
    4. Light curtain according to one of claims 1 to 3, characterized in that the disc (1) is a shop window.
    [5]
    5. Light curtain according to one of claims 1 to 3, characterized in that the disc (1) is the contact surface of a touch screen.
    [6]
    6. Input device for a data processing system, which has a light curtain according to one of claims 1 to 5 wherein the data processing system in response to the detection result on the detector surface (6) can be influenced, characterized in that the input device additionally comprises a freely movable pointing device which by the data processing system is recognizable by the pointing device emits light which is detectable by the detector surface (6). Page 11
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4097800A|1977-01-12|1978-06-27|The United States Of America As Represented By The Secretary Of The Army|Laser screen|
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    US20090033940A1|2007-08-03|2009-02-05|Siemens Medical Solutions Usa, Inc.|Multi-Level Light Curtain With Structure Light Sources and Imaging Sensors|
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    DE2550653C3|1975-11-11|1978-12-21|Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch|Rotating beam light curtain|
    DE19723974A1|1997-06-06|1998-12-17|Draexlmaier Lisa Gmbh|Method for preventing a foreign object from being trapped and a trap protection system|
    US6864882B2|2000-05-24|2005-03-08|Next Holdings Limited|Protected touch panel display system|
    CN101971128B|2007-12-05|2013-07-17|阿尔梅瓦股份公司|Interaction arrangement for interaction between a display screen and a pointer object|
    AT507267B1|2008-07-15|2011-12-15|Isiqiri Interface Tech Gmbh|CONTROL PANEL FOR A DATA PROCESSING SYSTEM|
    KR100910024B1|2008-10-13|2009-07-30|호감테크놀로지|Camera type touch-screen utilizing linear infrared emitter|
    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|
    AT508135B1|2009-04-16|2010-11-15|Isiqiri Interface Technologies|FLARED OPTICAL DETECTOR SUITABLE FOR LIGHT CURING APPLICATIONS|AT512461B1|2012-02-10|2018-02-15|Isiqiri Interface Tech Gmbh|DEVICE FOR ENTERING INFORMATION TO A DATA PROCESSING PLANT|
    AT15513U1|2016-03-17|2017-11-15|Isiqiri Interface Tech Gmbh|Light-sensitive touch screen|
    WO2020068277A2|2018-08-06|2020-04-02|Sensormetrix|Optical systems and devices for ballistic parameter measurements|
    法律状态:
    2018-11-15| MM01| Lapse because of not paying annual fees|Effective date: 20180304 |
    优先权:
    申请号 | 申请日 | 专利标题
    AT2892011A|AT510692B1|2011-03-04|2011-03-04|LIGHT CURTAIN AS WELL AS AN INPUT DEVICE BASED ON A DATA PROCESSING PLANT|AT2892011A| AT510692B1|2011-03-04|2011-03-04|LIGHT CURTAIN AS WELL AS AN INPUT DEVICE BASED ON A DATA PROCESSING PLANT|
    EP12714523.3A| EP2681648A1|2011-03-04|2012-02-09|Light curtain and an input apparatus based thereon for a data processing system|
    US14/002,813| US20140022170A1|2011-03-04|2012-02-09|Light curtain and an input apparatus based thereon for a data processing system|
    PCT/AT2012/000022| WO2012119161A1|2011-03-04|2012-02-09|Light curtain and an input apparatus based thereon for a data processing system|
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