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1. (WO1985005465) METHOD AND DEVICE FOR DEFLECTING A LIGHT BEAM FOR THE WRITING AND READING IN MATRIX FORM OF A DOCUMENT

Pub. No.:    WO/1985/005465    International Application No.:    PCT/CH1985/000084
Publication Date: Dec 5, 1985 International Filing Date: May 21, 1985
IPC: G02B 26/10
Applicants: FONDATION SUISSE POUR LA RECHERCHE EN MICROTECHNIQ
SIDLER, Thomas
Inventors: SIDLER, Thomas
Title: METHOD AND DEVICE FOR DEFLECTING A LIGHT BEAM FOR THE WRITING AND READING IN MATRIX FORM OF A DOCUMENT
Abstract:
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).