Optic disc device focus deflection regulation means

Abstract

The invention relates to a method for adjusting the focus deflection of a compact disc device, which allows an empty disc to have the most suitable focus deflection adjustment. The invention comprises the following steps: in the first step, judging whether the compact disc with installation inserted is an empty disc; in the second step, recording virtual data on a set area of the disc if the empty disc is judged in the first step; in the third step, changing the focus deflection value into the set value, and detecting the regeneration RF signal characteristic and tracking error signal characteristic of the recorded virtual data in the second step; in the fourth step, detecting the most suitable focus defection value of the empty disc according to the detecting result in the third step. The invention can perform the most suitable focus defection adjustment on the empty disc without recorded data, thus improving the quality of regeneration and recording.

Description

technical field [0001] The invention relates to a method for adjusting the focal length skew of an optical disk device which can also adjust the most suitable focal length skew on an empty disk. Background technique [0002] Generally, among the important factors (Factors) that affect the reproduction and recording quality of the optical disc device, the focus bias is one of the important factors. [0003] That is to say, if the focal length position of the objective lens (focus lens) of the inserted optical disc is incorrect, the quality of reproduction and recording will decrease. Therefore, it is necessary to adjust the focus skew at the most suitable value on the inserted disc. [0004] Therefore, generally on an optical disc device, the tracking error signal and the reproduced RF signal are used to detect an optimum focus skew value for an inserted optical disc. Adjust the focus skew according to the optimum focus skew value detected earlier. [0005] On the other ha...

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Problems solved by technology

[0006] However, as mentioned above, only the Tracking Error (TE) signal has been used to adjust for focus skew in the past.

as attached figure 1 , the reliability of the tracking error signal is very low. If only the tracking error signal is used, it is impossible to adjust the focus deviation to the most suitable aspect, which will lead to a decrease in the quality of reproduction and recording.

This problem will be more serious if factors such as offset center (eccentricity) that affect tracking error information exist on the plate

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