• 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:AT510175A4
    申请号:T16162010
    申请日:2010-09-28
    公开日:2012-02-15
    发明作者:Johannes Dr Riegl；Rainer Ing Reichert
    申请人:Riegl Laser Measurement Sys；
    IPC主号:
    专利说明:

    PATENT OFFICER blPLiltäd DR.TECHN. ANDREAS WEISER EUROPEAN PATENT AND TRAILEMARK ATTORNEY A ll30 VIENNA · KOPFGASSE7 03906 RIEGL Laser Measurement Systems GmbH A-3580 Horn (AT)
    The present invention relates to a beam deflecting device for a laser scanner, with a mounted on a rotatable shaft mirror pyramid whose pyramid axis form the axis of rotation and their inclined pyramid sides their mirror surfaces.
    Such mirror pyramids are used in laser scanners to periodically pivot a laser scan beam directed axially about a mirror surface by rotating the mirror pyramid over a scan angle range, resulting in a planar or curved scan fan. If the mirror pyramid is provided with differently inclined pyramid sides or mirror surfaces, even several mutually divergent scanning fans can be emitted.
    The fabrication of mirrored pyramids with differently inclined mirror surfaces poses problems if more than three sides with more than two different inclinations are to be formed and the scanning compartments and thus the mirror surfaces should cover the same angular sectors: The different inclinations of the pyramid sides lead here to receding edges resp Steps at the junctions of the sides of the pyramid, resulting in a machining surface treatment TEL, (+43 1) 879 17 06 FAX: (+43 1) 879 17 07 HM All .: ΜΛΗ ^ ΡΑΊΈΝΊΊ '.NHT · WEB: WWW, PATENTEN ET FIRST BANK: 038-56704-BEZ: 20111 ΙΒΛΝ: ATI02011100003856704 BIG: GIB ΑΛΊ WW VAT: AT U 53832900 of the pyramid sides to make the inclinations and mirror surfaces difficult and makes it impossible to polish the mirror surfaces.
    The invention has for its object to provide a beam deflecting device for a laser scanner, with which a plurality of diverging scanning trays can be generated and which can be made in a simple manner.
    This object is achieved with a beam deflection device of the aforementioned type, which is characterized according to the invention in that the shaft carries at least one radially projecting optical prism, which is set in the beam path of the laser scanner a mirror surface of the mirror pyramid.
    In this way, an additional Strahlablenkprisma is arranged upstream of individual mirror surfaces of the mirror pyramid, so that the combination of prism and mirror surface results in the optical effect of a mirror pyramid with differently inclined pyramid sides, but without experiencing the manufacturing problems associated with such mirror pyramids.
    Preferably, in the beam path of the laser scanner, each optical prism of its mirror surface is set substantially congruently in order to obtain a uniform beam deflection during the rotation of the mirror pyramid without interference effects in the transition from one mirror surface to the next. It is favorable if at least two. optical prisms are evenly distributed over the circumference of the shaft, so that there is a balanced arrangement.
    With the aid of the invention, different mirror pyramids can be modularly assembled with different prisms to produce any number of different scan fans. For this purpose, provision is made in particular for at least two optical prisms having different optical power, and / or at least two pyramid sides of the mirror pyramid to have different inclinations.
    According to another preferred feature of the invention, each optical prism is aerodynamically shaped on its leading edge in the direction of rotation of the shaft in order to reduce the air resistance during rotation.
    A further preferred embodiment of the invention consists in that several optical prisms are threaded axially one behind the other onto the shaft at their radially inner sides, which enables a modular production and assembly of the beam deflecting device.
    The invention will be explained in more detail with reference to embodiments illustrated in the accompanying drawings. In the drawings show
    FIG. 1 shows a perspective view of the area of use of a mirror pyramid in the context of a laser scanner which is shown in section and schematically; FIG.
    Figures 2 and 3 a first embodiment of a beam deflector according to the invention in a partially sectioned side view and in a plan view. and Figs. 4 and 5 a second embodiment of the beam deflector of the invention in a side view and in a plan view.
    1 schematically shows a laser scanner 1, which comprises a mirror pyramid 2, which is mounted on a shaft 3 and is rotated by a motor 4. To the motor 4 a Drehwinkelkodierer or sensor 5 is flanged, which measures the current position of the mirror pyramid 2 or encoded and signaled to an electronic unit 6.
    The mirror pyramid 2 has the shape of a four-sided pyramid whose pyramid axis 2 'is its axis of rotation. The rotation axis 2 'inclined pyramid sides 7-10 form the mirror surfaces of the mirror pyramid. 2
    The mirror surfaces 7-10, for example, by machining, milling, grinding, polishing, honing and / or lapping the sides of a pyramidal solid or hollow body, which builds the mirror pyramid 2, made. Alternatively or additionally, the mirror surfaces could also be constructed by coating, steaming, gluing etc. of the pyramid sides with highly reflective material.
    It will be understood that in the present specification, the term "pyramid shape" means or "mirror pyramid " any kind of pyramid with any polygon-shaped «
    5 · * · ♦ ··
    Base area (base) is understood u.zw. both straight and "crooked" Pyramids (pyramid axis not perpendicular to the base axis), regular or irregular pyramids, pointed or "blunt " Pyramids (" truncated pyramids "), as well as those pyramids truncated at their top and / or base, such as the pyramids shown in Figs. 1 and 2, whose bases are circularly trimmed to reduce air resistance in rotation.
    On the mirror pyramid 2, a laser transmitter 11 is directed, which emits a laser beam 12 on the mirror surfaces 7-10, u.zw. to one each during their rotation, so that the laser beam 12 is pivoted by the rotational movement of the mirror pyramid 2 periodically over a scanning angle α to form a scanning fan 13. With the scanning fan 13, for example, a surface 14 "line by line" can be selected. are sampled when the scanning fan 13, i. the entire laser scanner 1, in a scanning plane-foreign direction 15, e.g. normal to scanning fan 13, over which surface 14 is moved.
    The reflections of the laser beam 12 and scanning fan 13 from the surface 14 are de-tektiert with a laser receiver 16, which receives the reflected rays - again over the path of the mirror pyramid 2 -, converted into electrical signals and the electronic unit 6 supplies for evaluation. The latter controls the laser transmitter 11 accordingly, e.g.
    triggered, pulsed, modulated, etc. as known in the art.
    The mirror pyramid 2 considered here is of a special kind, u.zw. at least one of the pyramid sides 7 -10 has a different inclination relative to the axis of rotation 2 'than the remaining pyramid sides 7-10. This results in the rotation of the mirror pyramid 2 not only a single scanning fan 13 but depending on the number of inclinations two, three or more scanning fan 13, 17, etc., which diverge from each other. Laser scanners of this type are required for different applications, for example for detecting undercuts of the surface 14 for compensation or differential measurements by scanning the same surface 14 twice or the like.
    In order to avoid the aforementioned manufacturing problems for a mirror pyramid 2 with a plurality of differently inclined pyramid sides or mirror surfaces 7-10, a combined beam deflection device 21 is inserted into the laser scanner 1 according to the invention instead of the mirror pyramid 2 of FIG first embodiment in Figs. 2 and 3 is shown.
    According to FIGS. 2 and 3, the beam deflection device 21 comprises, on the one hand, a mirror pyramid 2 of the type discussed with reference to FIG. 1 and, on the other hand, at least one or two optical prisms 22, 23 arranged upstream of the mirror pyramid 2 in the beam path of the laser beam 12 , The op-
    I prisms 22, 23 sit on the same shaft 3 as the
    Mirror pyramid 2 and are rotated with this, where they are - viewed in the beam path of the laser scanner congruent over one of the mirror surfaces 7-10 of the Spie-gelpyramide 2. In the example shown, two prisms 22, 23 are provided which sit diametrically on the shaft 3, for example by means of a common, central hub 24, via which they engage the shaft 3. Alternatively, each prism 22, 23 could be attached to the shaft 3 with its own hub, clamp, bolt, etc.
    By the diametrical arrangement of the prisms 22, 23 remain between these gaps 25, 26. The prisms 22, 23 are for example congruent over the mirror surfaces 7, 9 and the gaps 25, 26 congruent over the mirror surfaces 8, 10. Upon rotation of the beam deflector 21 with respect to the laser scanner 11 thus enters the laser beam 12 in the passage of the mirror surfaces 8, 10 through the gaps 25, 26, for example, to generate the scanning fan 13. During the passage of the mirror surfaces 7, 9, the laser beam 12 is refracted by the prisms 22, 23 and thus impinges on the mirror surfaces 7, 9 at a different angle in order to produce the divergent scanning fan 17.
    If prisms 22, 23 are combined with a mirror pyramid 2 which has mirror surfaces 7-10 with different inclinations, the number of diverging scanning compartments 13, 17 etc. can be multiplied. For example, the mirror surfaces 7, 8 can have a first inclination and the mirror surfaces 9 10 has a second inclination relative to the axis of rotation 2 '. In conjunction with prisms 22, 23, which are the mirror surfaces 7, 9 pre-set, thus resulting in four combinations, i. four different optical paths and thus four different scanning compartments as follows: prism refraction through 22, first mirror inclination through 7; no prism refraction, first mirror tilt by 8, prism break by 23, second mirror tilt by 9; no prism refraction, second mirror tilt by 10.
    It is understood that this concept can be duplicated accordingly. Thus, mirror pyramids can be combined with three, five, six or mirror surfaces with one, three, four, etc. prisms, wherein the mirror surfaces different inclinations - where manufacturable - can take and with prisms with different optical powers, either by appropriate wedge angle or through corresponding refractive indices of the optical materials used can be combined.
    FIGS. 4 and 5 show an example of a possible combination of three prisms 27-29, each of which sits on the shaft 3 via its own hub 30-32 and which are preset to a six-sided mirror pyramid 2 (not shown) analogous to FIG. Each second mirror surface of the mirror pyramid 2 is thus a prism 27 - pre-set 29. The prisms 27-29 can each have a different optical power, so that when combined with a mirror pyramid 2 with the same inclinations, e.g. four scanning compartments or in combination with a mirror pyramid 2 with differently inclined mirror surfaces up to six scanning fan can be emitted.
    If the prisms 27-29 are threaded axially one behind the other onto the shaft 3, as shown in FIGS. 4 and 5, the prisms closer to the mirror pyramid 2 preferably have a higher optical power than the mirror pyramid 2 located farther away, in order to achieve the different axial path length of the mirror pyramid 2 Broken laser beam from the prism to the respective mirror surface to compensate for something.
    The optical prisms 22, 23, 27-29 can each be beveled or aerodynamically shaped on their leading edge 33, 34 viewed in the direction of rotation of the shaft 3, in the manner of the leading edge of an airfoil profile, in order to increase the aerodynamic drag of the beam deflector 21 as it rotates reduce. For the same reason, the mirror pyramid 2 is preferably trimmed at its base 35 in a circular (or cylindrical) manner, as a result of which a short cylinder jacket-shaped edge 36 adjusts there in order to reduce the air resistance.
    The material used for the optical prisms 22, 23, 27-29 is preferably high-refractive grade special glass, which is milled and polished accordingly.
    The invention is not limited to the illustrated embodiments, but includes all variants and modifications that fall within the scope of the attached claims.
    权利要求:
    Claims (7)
    [1]
    1. Beam deflection device for a laser scanner, with a mounted on a rotatable shaft pyramid, the pyramid axis of the axis of rotation and their inclined pyramid sides form their mirror surfaces, characterized in that the shaft (3) at least one radially projecting optical prism (22, 23 , 27-29), which in the beam path of the laser scanner (1) seen a mirror surface (6 - 10) of the mirror pyramid (2) is preset.
    [2]
    2. Beam deflecting device according to claim 1, characterized in that viewed in the beam path of the laser scanner (1) each optical prism (22, 23, 27 - 29) of its mirror surface (6 - 10) is set substantially congruent.
    [3]
    3. beam deflection device according to claim 1 or 2, characterized in that at least two optical prisms (22, 23, 27 - 29) are distributed uniformly over the circumference of the shaft (3).
    [4]
    4. beam deflection device according to one of claims 1 to 3, characterized in that at least two optical prisms (22, 23, 27 - 29) have different optical power.
    [5]
    5. beam deflection device according to one of claims 1 to 4, characterized in that at least two pyramid sides (6-10) of the mirror pyramid (2) have different inclination.
    [6]
    6. beam deflection device according to one of claims 1 to 5, characterized in that each optical prism (22, 23, 27 - 29) on its in the direction of rotation of the shaft (3) leading edge (34) is aerodynamically shaped.
    [7]
    7. beam deflection device according to one of claims 1 to 6, characterized in that a plurality of optical prisms (27 - 29) are flanged on their radially inner sides axially one behind the other on the shaft (3).
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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
    US3910675A|1974-11-04|1975-10-07|Itek Corp|Laser scanning apparatus|
    JPS55113018A|1979-02-23|1980-09-01|Canon Inc|Scanning optical system|
    DE3217785C1|1982-05-12|1983-12-15|Messerschmitt-Bölkow-Blohm GmbH, 8000 München|Optomechanical scanner|
    JPH0627401A|1992-07-07|1994-02-04|Olympus Optical Co Ltd|Optical scan image information detecting device|WO2013177650A1|2012-04-26|2013-12-05|Neptec Design Group Ltd.|High speed 360 degree scanning lidar head|
    WO2021175440A1|2020-03-06|2021-09-10|Huawei Technologies Co., Ltd.|Light-based ranging device design and operation|US3602571A|1968-12-03|1971-08-31|Westinghouse Electric Corp|Optical beam scanner providing angular displacements of large beam diameters over wide fields of view|
    US4934780A|1987-04-08|1990-06-19|Compugraphic Corporation|Constant deviation scanning apparatus|
    US4861144A|1987-11-30|1989-08-29|Optical Recording Corporation|Field correction apparatus|
    US4978184A|1988-10-20|1990-12-18|The Gerber Scientific Instrument Company|Laser raster scanner having passive facet tracking|
    US6098885A|1990-09-10|2000-08-08|Metrologic Instruments|Countertop projection laser scanning system for omnidirectional scanning volume projected above a countertop surface of code symbols within a narrowly-confined scanning|GB201603716D0|2016-03-03|2016-04-20|Qinetiq Ltd|Detection device|
    DE102017208736A1|2017-05-23|2018-11-29|Robert Bosch Gmbh|LIDAR device with increased sampling frequency and method for sampling a sampling area|
    EP3792653B1|2019-09-12|2022-01-26|RIEGL Laser Measurement Systems GmbH|Laser scanner|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    AT16162010A|AT510175B1|2010-09-28|2010-09-28|BEAM DEVICE AND LASER SCANNER HIEFÜR|AT16162010A| AT510175B1|2010-09-28|2010-09-28|BEAM DEVICE AND LASER SCANNER HIEFÜR|
    PCT/AT2011/000366| WO2012040749A1|2010-09-28|2011-09-08|Beam deflecting device for a laser scanner|
    EP20110767594| EP2622364B1|2010-09-28|2011-09-08|Beam deflecting device for a laser scanner|
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