| 摘要 |
A car door window frame 12, towards which a window pane rises, carries a light guide 14, e.g. an optic fibre, in a cover 15 or in the frame covering 13. A member trapped by the rising pane presses the guide and thus restricts the quantity of light conducted, which restriction is sensed to stop or reverse the window motor. Every time the pane is raised the system detects a value of light conductivity of the guide as a reference value. The guide may be looped backwards and forwards through incisions across the cover (Figures 3 and 4, not shown), which is said to allow easier pressure detection. |
