Abstract: The device comprises a fixed base (1) and a support (3) for the optical component, together with at least one intermediate plate (2). These parts are hinged to one another by means of at least two independent hinge means each of which comprises a rod (13) co-operating with grooves (9, 10) provided respectively in facing plane faces of two of the parts (2, 3) for guiding said parts in rotation, screw adjustable abutment means (17, 18) for separating the plates (2, 3) from each other, and a resilient clip (14) placed astride the guide means (9, 10, 13) and the adjacent edges (11, 12) of the plates (2, 3) and urging them towards each other.