| 摘要 |
<p>The present invention relates to a tracking error detection method for an optical storage system wherein an optical disk comprises a plurality of adjacent track portions with a radial track pattern in which a number n>2 of adjacent track portions repeatedly exhibit non-uniform radial track distances (TP<SUB>1</SUB><>TP<SUB>2 </SUB>. . . <>TP<SUB>n</SUB>), whereby the sum of said radial track distances (TP<SUB>Sigma</SUB>=TP<SUB>1</SUB>+ . . . +TP<SUB>n</SUB>) is higher than the reciprocal optical cutoff lambda/( 2 NA) of the optical disk drive. The method comprises projecting a plurality of (n) satellite light spots (S<SUB>1</SUB>, . . . , S<SUB>n</SUB>; S<SUB>L</SUB>, S<SUB>M</SUB>) and one main spot (S<SUB>R</SUB>) onto said optical disk, each satellite spot being displaced in radial direction off the main spot by another one of half the radial track distances (TP<SUB>1</SUB>/2<>TP<SUB>1</SUB>/2<> . . . <>TP<SUB>n</SUB>/2), respectively, and generating push-pull signals (PP<SUB>1</SUB>, . . . ,PP<SUB>n</SUB>; PP<SUB>L</SUB>, <SUB>PPM) </SUB>for each satellite spot. The invention further relates to an optical disk drive implementing said method.</p> |
