Optical disc device and reproduction method

光盘装置和再现方法

Abstract

由于光盘的面振,不能够将叠加在直流信号的高频电流的频率保持为最佳频率。因此,本发明涉及光盘装置和再现方法,其中,通过生成将高频信号与直流信号叠加而构成的驱动信号,将该驱动信号施加在激光光源上,驱动该光源,根据激光在光盘上的反射光,生成与光盘的记录面上的激光的散焦量相应的信号电平的伺服信号,并且,抽出该伺服信号的低频成分,根据抽出的伺服信号的低频成分,控制与直流信号叠加的高频信号的频率。
Due to the axial runout of an optical disc, a frequency of a high-frequency current to be superimposed onto a DC current could not be maintained. In order to solve the problem described above, a drive signal is generated by superimposing a high-frequency signal onto a DC current, the drive signal is applied to a laser beam light source, thereby the light source is driven; and a servo signal at a signal level corresponding to a defocus amount of the laser beam relative to the surface of the optical disc is generated based on a reflected light of the laser beam from the recording surface of the optical disc, and a low-frequency component of the servo signal is extracted, and thereby the frequency of the high-frequency signal to be superimposed onto the DC current in the light source driver is controlled based on the low-frequency component of the servo signal.

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