Compensation method and device for tracking operation of optical storage system

Abstract

An optical storage system includes a pickup head for picking up data from a storage medium. Firstly, the maxima of a tracking error signal and runout are obtained in a calibration procedure in a close loop formed by an optical pickup head, a pre-amplifier, a compensator, a band-pass filter and a maximum detector. A calibration factor is then defined and derived by using the obtained maxima and nominal factors of a power amplifier and the optical pickup head of the optical storage system. The path formed by the series-connected band-pass filter and maximum detector is then disabled, while the calculated calibration factor is then stored in the compensator. The optical storage system may operate in a close loop formed by the optical pick head, pre-amplifier, compensator, a power amplifier under a normal operation procedure so that the optical storage system may record or read data onto / from an optical disc under the compensation provided by the calibration factor.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a method for compensating a tracking operation of an optical storage system, and more particularly to a method for compensating a tracking operation of a pickup head of an optical storage system. The present invention also relates to a device for compensating a tracking operation of an optical pickup head of an optical storage system.BACKGROUND OF THE INVENTION[0002]Optical storage systems record digital data onto the surface of a storage medium, which is typically in the form of a rotating magnetic or optical disc, by altering a surface characteristic of the disc. The digital data serves to modulate the operation of a write transducer (write head), which records binary sequences onto the disc in radially concentric or spiral tracks. When reading this recorded data, a read transducer (read head), positioned in close proximity to the rotating disc, detects the alterations on the medium and generates a sequence of correspond...

AI Technical Summary

Benefits of technology

"The present invention provides a method and device for compensating a tracking operation of a computer storage system to speed up tracking. The method involves obtaining runout information when the pickup head is not in focus-on but track-on, and calibrating the system to compensate for the runout and maximize the tracking performance. The calibration factor is stored in a compensator for use in the normal operation procedure. The device includes a pickup head, tracking error signal generator, tracking output signal generator, power amplifier, band-pass filter, and maximum detector, which form a close loop for deriving the calibration factor. The invention allows for faster tracking and improved performance of optical disk drives."

Problems solved by technology

Firstly, a runout associated with a relative motion between the pickup head and the storage medium is obtained when the optical pick head is in a status of focus-on but not track-on.

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