| 摘要 |
A device for monitoring a thoroughfare (4) and access area (5) of an automatically movable door (1), comprising distanced, radiation-emitting and radiation-detecting elements. At least one of the radiation-emitting or radiation-detecting elements (8,20) has a wide action range (9; 21), in comparison with at least two opposing elements of a different type which have a narrow action range (11, 13; 16, 18). The main active direction of at least one element (10; 15) having a narrow action range (11; 16) is oriented towards the opposing element (8; 20) having a wide action range (9; 21) and the radiation detecting element (8; 15) reacts to an interruption in said radiation. The main active direction of at least one other element (12; 17) having a narrow action range (13; 18) is oriented towards the access area (5) and the radiation-detecting element (8; 17) sensing the access area (5) reacts to radiation reflection. |
