PROCEDE ET DISPOSITIF DE DEFLEXION D'UN FAISCEAU DE LUMIERE POUR L'ECRITURE ET LA LECTURE SOUS FORME MATRICIELLE D'UN DOCUMENT

摘要

The device comprises a holographic structure including a plurality of holograms (4) carried by the facets of a polygonal pyramid (1). A coherent light source emits a collimated beam (8) through a shaping optics (7) to the holograms (4) rotatingly driven about the axis (2) of the pyramid. The reconstructed beam projects a focal spot (11) on a screen (12). To correct the geometrical curvature of the line described by the focal spot, the device comprises an oscillating lens (16) mounted on a mechanical, electromechanical or piezoelectric homogeneous transducer (17) interposed in the beam (8).