| 摘要 |
The invention relates to an optical device enabling a collimated light beam (S) to be given a translational movement (T) parallel to itself, comprising at least one pair of reflective faces (M1, M4) rigidly fastened to each other and able to move in rotation about an axis (X) parallel to the planes of these faces, off which faces the light beam is reflected in succession, as well as fixed reflective faces (M2, M3) which impose on the beam an even number of intermediate reflections. The set of fixed and movable reflective faces (M1-M4) of the device is arranged, and the angle of rotation ( alpha ) of the movable reflective faces is limited, so that, during the operation of the device, the beam (E, 1, 2, 3) always encounters the same reflective faces, in the same order. <IMAGE>
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