公开(公告)号：US6124586A

公开(公告)日：2000-09-26

申请号：US109304

申请日：1998-06-30

申请人： Beat De Coi

发明人： Beat De Coi

IPC分类号： F16P3/14 ,  G01J1/02 ,  G01V8/20 ,  G08B13/183 ,  C01V9/04 ,  G06M7/00

CPC分类号： F16P3/14 ,  F16P3/144 ,  G01V8/20

摘要： To properly align support elements (17,19), typically support bars or strips of a light curtain formed by a plurality of light beams (21), transmitted between transmitters (13) and receivers (15) on the respective support bars (17,19), a separate alignment light source, typically a laser (29), is provided. The laser (29) projects a light beam (33) to a receiver (35) from one (17) of said bars to the other (19). A counter-directed beam (33') is projected from the other (19) of the bars to the first bar (17). The counter-directed beam (33') spaced from the first direct beam (33), can be generated by a second laser (29'), or by deflecting the received direct beam (33) on or in the second bar (19) by 180.degree. to provide the counter-directed return beam to the first bar (17). This permits rapid alignment of the respective bars, even with respect to five directions of freedom of movement of the respective bars. Preferably, the laser is pulsed at a frequency between 1 and 5 Hz, and a timing circuit is provided to disconnect the laser or lasers after suitable alignment timing intervals, or after a safety interval, so that the lifetime of the laser or lasers will be commensurate with the lifetime of the radiation transmitters (13) and receivers (15) of the light curtain itself.

摘要翻译： 为了适当地对准支撑元件（17,19），通常支撑在由相应的支撑杆（17）上的发射器（13）和接收器（15）之间传输的由多个光束（21）形成的光幕的条或条， 19），提供了单独的对准光源，通常是激光（29）。 激光器（29）将光束（33）从一个（17）的所述杆向另一个（19）投射到接收器（35）。 反向导向梁（33'）从杆的另一个（19）突出到第一杆（17）。 与第一直接光束（33）间隔开的反向指向光束（33'）可以由第二激光器（29'）产生，或者通过使接收到的直接光束（33）偏转在第二条光栅（19）上或第二条光栅 180度以提供反向导向的返回光束到第一条（17）。 这允许各个杆的快速对准，甚至相对于各个杆的五个运动自由方向。 优选地，激光器以1和5Hz之间的频率脉冲，并且提供定时电路以在适当的对准定时间隔之后或在安全间隔之后断开激光器或激光器，使得激光器或激光器的寿命将 与光幕本身的辐射发射器（13）和接收器（15）的寿命相称。