| 摘要 |
The device has a pinpoint light source (3) i.e. LED, situated at the proximity of a focal point of an elliptical reflector (1) such that light rays (9) emitted by the source are reflected towards another focal point. An optical element (6) i.e. strip, has a rectangular plane surface whose zone i.e. concave lens, is situated at the proximity of the latter point to receive the rays with an angle of incidence. The element is movable, along a horizontal plane of the surface, transversally to an optical axis by an electric actuator e.g. electric motor, to displace the zone outside the rays. |
