Process and optical device for focussing a light energy beam...

Details Process and optical device for focussing a light energy beam... Process and optical device for focussing a light energy beam...

G - Physics

11

B

352/32.21

G11B 7/09 (2006.01) G11B 7/007 (2006.01) G11B 7/013 (2006.01)

Patent

CA 1203620

ABSTRACT OF THE DISCLOSURE A process and device for focussing a light energy beam on a data carrier comprising sites formed of virgin areas free from any data recording provided along tracks and serv- ing as reference plane for said focussing. In a preferred variation, these areas are preceded by flags associated with a specific code. Control is achieved by measuring the deviation between the plane of focussing of a beam into a spot scanning the tracks and the reference plane formed by the surface of the virgin areas. Between two passages of these areas the measurements are stored. The focussing error signal is obtained by filtering these measurements.

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