US 6,990,048 B2 · Track jump control apparatus and track jump method

Abstract

A disk apparatus includes a DSP (digital signal processor), and the DSP controls respective circuit components under instructions of a MCU. During a track jump, a DSP core detects a zero-cross cycle of a TE (Tracking Error) signal just before. If a detected zero-cross cycle is delayed than a target value, the DPS core applies an acceleration pulse of a first predetermined level to a driver, and if the zero-cross cycle is faster than the target value, the DPS core applies a deceleration pulse of a second predetermined level to the driver, whereby an objective lens can be controlled to move at approximately constant speed between adjacent tracks. However, if the zero-cross cycle is considerably delayed than the target value, the DSP core forestalls a reverse rotation of a moving direction of the objective lens against the disk by greatly accelerating the objective lens. Therefore, the number of tracks to have been jumped is not to be counted erroneously.

Claims8

Dependent claims

A track jump control apparatus, comprising:

a tracking error signal detector outputting a tracking error signal;
a comparator for determining whether or not a zero-cross cycle of an immediately preceding tracking error signal exceeds a predetermined threshold value until a target track number is reached;
and
a tracking actuator driver for driving a pick-up in a track traversing direction at a time of track-jumping, and outputting a plurality of pulses including,
a first acceleration pulse applied with a suitable timing, and
a second acceleration pulse larger than said first acceleration pulse when it is determined by the comparator that said predetermined threshold value is exceeded.

3 more elements

Dependencies are inferred from the claim text.

Track jump control apparatus and track jump method

Life of this patent

Track jump control apparatus and track jump method

Life of this patent

Abstract

Claims8