| 摘要 |
A method of detecting objects in front of a doorway, such as the powered sliding doors 1, 3 of an elevator car, comprising monitoring a first area, preferably directly in front 38 of the doorway, and separately monitoring at least one second area, preferably in front and to the side 34, 36 of the doorway. An obstruction signal may be produced fro the powered door controller if an object is detected in either area. Preferably the first area is monitored by arranging a transmitter 4 in one door and a receiver 5 in the opposite door to detect reflections form an obstacle. The second area may be served by having a transmitter and receiver arranged on the same door 4. (Figure 4 is a plan view, fig 5 is a front view). |
