Crosstalk signal reducing method of CD equipment during focusing servo-control and CD equipment

Abstract

The invention relates to a crosstalk signal reduction method during the focusing servo control of a disc device, and a disc device, in particular to a method for reducing the servo crosstalk with focusing error signals of a DVD / CD recorder driver. In order to achieve the objects, the invention comprises the steps as follows: after the dispersed light of the objective lens output light of the optical pickup is decomposed as the dispersed light along the fixed direction, the mutual relation between the servo crosstalk signals of the servo error signals is derived, thus deriving corresponding factors; according to the assembly direction of the objective lens, after the corresponding factor relation is derived, and the assembly direction of the objective lens of smallest corresponding factor value can be derived. Therefore, as the invention is ensured to be a proposal of the focusing error signal crosstalk reduction method of the dispersed light method defects, the burden of developing the next generation type can be greatly lightened.

Description

technical field [0001] The invention relates to a method for reducing crosstalk signals during focusing servo control of optical disk equipment and an optical disk equipment using the method, in particular to a method for reducing servo crosstalk of focusing error signals of DVD / CD recorder drivers. Background technique [0002] For the playback or recording of DVD and CD, it is necessary to adjust the tracking servo for tracking the groove (or groove row) and the focus servo for focusing between the information planes. The servo stability of the system is determined according to the characteristics of these signals. Each servo is embodied in various ways, but the present invention relates to the focus servo among the above-mentioned servos, and particularly relates to the improvement of the signal characteristics of the focus servo using the astigmatism method. There are many ways to generate light signals for objective lens focusing, but the most common astigmatism way wil...

AI Technical Summary

Problems solved by technology

Theoretically, the focus error signal may be '0' or a smaller value due to running the focus servo, but occasionally Figure 3b As shown, the focus error signal level can increase abnormally, eventually causing the focus servo to oscillate, or even worse, the focus servo cuts out

[0006] The signal loaded by the focus error signal in this search action is called the servo crosstalk signal of the focus error signal, such as Figure 3b As shown, the reason for the abnormal surge in servo crosstalk has not yet been studied, but there is a report that there are several related factors.

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