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AssigneeHitachi, Ltd.
InventorsAtsushi Saito, Hisataka Sugiyama
Estimating the term…
For use with an optical disk having a plurality of reference marks Mk arranged at intervals of P in the radial direction and deviant marks Hx (x=1, 2, . . . ) arranged so as to deviate in at least two different phases in the radial direction from the reference marks Mk, an optical disk tracking control method comprising the steps of: generating tracking error signals A, B, . . . with at least two different phases obtained by addition and subtraction on combinations of the light quantity signal corresponding to the reference mark Mk and the light quantity signals corresponding to the deviant marks Hx; and positioning the data tracks at intervals of P/4 or less in the radial direction based on the tracking error signals A, B, . . . .
For use with an optical disk having a plurality of reference marks Mk arranged at intervals of P in the radial direction and deviant marks H1 arranged so as to deviate by P/4 toward the outside of the radial direction from the reference marks and deviant marks H2 arranged so as to deviate by P/4 toward the inside of the radial direction from the reference marks, an optical disk tracking control method comprising the steps of:
An optical disk device for reproducing data from or recording data onto an optical disk having a plurality of reference marks Mk arranged at intervals of P in the radial direction, deviant marks H2 arranged so as to deviate by P/4 toward the outside of the radial direction from the reference marks Mk, and deviant marks H2 arranged so as to deviate by P/4 toward the inside of the radial direction from said reference marks Mk, said optical disk device comprising:
Dependencies are inferred from the claim text.