Optical disk data accessing device and method for correcting and adjusting optical head inclining anyle

Abstract

An optical disc data access device is disclosed, which has an optical head tilt control module for controlling the tilt amount of the optical head to reduce the jitter amount of the generated reproduced signal. The optical head tilt control module includes a regeneration signal generation unit for receiving the radio frequency signal generated by the optical head and generating an EFM signal; a jitter detector for receiving the EFM signal and detecting the jitter amount of the EFM signal; a tilt control unit , used to output different tilt control values ​​during the correction phase, and filter out better tilt control values, and generate tilt control values ​​based on the orbit position of the regenerated data during the adjustment phase; and a tilt driver, used to receive the tilt control value And generate a tilt control signal to drive the optical head to rotate.

Description

technical field [0001] The present invention relates to an optical disc access device, in particular to an optical disc access device and an optical disc access device which reduces the jitter (jitter) of the read EFM (eight to fourteen modulation) signal by adjusting the tilt angle (tilt) of the optical head. Head tilt angle adjustment method. Background technique [0002] The optical pickup of the optical recording and reading device needs an actuator to adjust the object lens so that the information read or recorded by the optical device, such as EFM (Eight to Fourteen Modulation) signal, can Stronger (robust). The adjuster can move the optical head precisely to the desired position (angle). However, when the optical disc to be read or recorded is curved, or the tilt angle of the optical head is incorrect, the read or recorded information will deteriorate. In order to compensate for the information deterioration, it is necessary to measure the relative inclination angl...

AI Technical Summary

Problems solved by technology

[0006] Although the above-mentioned structure can measure the inclination of the optical head for optimal focus and tracking, it is necessary to use the displacement detected by the displacement detector

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