| 摘要 |
<p>The present invention relates to a light curtain that comprises at least one first optical unit (116) having a plurality of light emitting elements (122) and light receiving elements (124) and at least one second optical unit (118) having a plurality of light emitting elements (122) and light receiving elements (124), wherein said light emitting elements and light receiving elements are operable to form a light grid from a plurality of light barriers formed between opposing light emitting elements and light receiving elements. The first and second optical unit (116,118) each comprise a transceiver unit (102,104) carrying said plurality of light emitting elements and light receiving elements, and at least one separate detachable plug-in module (106,108), said first and second transceiver units (102,104) being identically built and said first and second plug-in modules (106,108) differing from each other in order to define the functionality of the first optical unit and the second optical unit, respectively.</p> |
