| 摘要 |
Optical axes of the day path and of the night path extend in a sagittal plane (5,9) of the carrying vehicle and the passage from the night path to the day path or conversely is effected by means for displacing a first reflector parallel to the plane in order that the input light beams are directed to the optical axis of the day path or of the night path. A second output reflector along the optical axis for the day path is simultaneously displaced from an active position, for viewing by day, to a concealed position, for viewing by night, when said first reflector is displaced to deflect said beams along said night path.
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