Focus control for optical disc system

Details Focus control for optical disc system Focus control for optical disc system

G - Physics

11

B

352/32.21

G11B 7/095 (2006.01) G11B 7/09 (2006.01)

Patent

CA 1232966

PHN 10 949 15 30-5-1984 ABSTRACT: "Apparatus for recording and/or reading information in/Prom a track of a reflecting record carrier, which apparatus comprises a focusing-control system with reduced spot- offset sensitivity." The apparatus for recording and/or reading infor- mation in/from a track (7) of a radiation-reflecting record carrier (1) by means of a light source (4) which produces a light beam (3), an objective system (5) for focusing the light beam so as to form a light spot (V) on the record carrier depending on a control signal (Sf), a focusing- error detection system comprising an astigmatic element (11) and four detectors (D1 to D4), comprises means (20) for deriving the control signal, which means are constructed to derive a control signal (Sf) from the output signals (S1 to S4) of the four detectors which control signal sa- tisfies the formula: Image By means of this control signal the influence of offset of the light spot on the four detectors on the focusing is reduced drastically.

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