| 摘要 |
PROBLEM TO BE SOLVED: To directly detect an obstacle by arranging a sensor having light propagation characteristic for detecting the obstacle inside a cover provided over whole periphery of a door frame. SOLUTION: A cover 13 of a door frame 12 is constituted so as to connect to another cover 15. A sensor 14 made of an optical fiber conductor is accommodated inside a cover 15. In this constitution, if a pane meets any obstacle at its upper edge or a side surface, and the obstacle presses the cover 13 of the door frame 12 with lifting up of the pane, a cover 15 exclusive to the sensor 14 receives pressure. As a result, pressure is transmitted to the sensor 14 made of the optical fiber conductor, and the sensor 14 detects the pressure in the form of restriction and reduction of quantity of light. By detecting this with an electronic means, existence of the obstacle can be recognized. |
