| 摘要 |
<p>An obstacle-detecting apparatus for a powered door or a frame of the door includes a circuit board, a surface-mount element for emitting or receiving radiation, and a radiation re-directing device. The surface-mount element and radiation re-directing device are both mounted on the circuit board, the radiation re-directing device being at a defined position relative to the surface-mount element. The re-directing device includes a reflecting member, mounted to sit at a defined angle relative to radiation emitted from or received by the surface-mount element, for re-directing the radiation. The re-directing device also includes a moulded-plastic frame member on which the reflecting member sits and which is used to position the reflecting member relative to the surface- mount element. The reflecting member abuts a surface-mount emitter diode that emits radiation. The same re-directing device may be used with a receiving diode, but then the reflecting member is positioned on the circuit board to sit further from the diode; in that case, an end wall of the frame member is used for setting an appropriate distance between the re-directing device and the receiving diode. The re-directing device might alternatively be a prism. An obstacle-detecting apparatus with an emitter diode or diodes forms, together with an obstacle-detecting apparatus with a receiving diode or diodes, a system for detecting an obstacle in front of or between the powered doors. That system works in association with a visible-light display system to inform persons approaching an elevator car whether it is possible to safely enter the car.</p> |
