US 2002/0163864 A1 · Track jump controller and a track jump method

Abstract

A disk apparatus 10 includes a DSP 36. The DSP 36 controls each circuit component under the instruction from an MCU 44. When a braking pulse is applied to a driver 38b at the end of a jump, a corresponding tracking actuator control voltage is supplied to a tracking actuator 16. Then a DSP core 36a determines whether the TE signal level becomes equal to or below the predetermined value within a predetermined period shorter than the zero crossing cycle of the TE signal. In case the TE signal level does not become equal to or below the predetermined value within the predetermined period, the DSP core 36a determines that the travel direction of an objective lens 14 with respect to a disk 22 is reversed and applies a correction pulse having a polarity opposite to that of the braking pulse thus accelerating the objective lens 14.

Claims6

Dependent claims

A track jump controller for disk apparatus comprising:

a tracking actuator-driver;
and
a pickup which is jumped by the number of target tracks in the track traverse direction by said tracking actuator-driver and is stopped by applying a braking pulse, wherein
a kick pulse of a polarity opposite to a polarity of the braking pulse to a tracking actuator-driver when a tracking error signal is not dropped below a predetermined value within a predetermined time shorter than a zero crossing cycle of the tracking error signal after the braking pulse is applied.

1 more element

Dependencies are inferred from the claim text.

Track jump controller and a track jump method

Life of this patent

Track jump controller and a track jump method

Life of this patent

Abstract

Claims6