首页>
外国专利>
Optical drive device and focus servo control method
Optical drive device and focus servo control method
展开▼
机译:光驱装置及聚焦伺服控制方法
展开▼
页面导航
摘要
著录项
相似文献
摘要
An optical drive device includes first and second light sources, an objective lens configured to receive a first light emitted from the first light source and a second light emitted from the second light source and to irradiate both the first light and the second light to an optical disc recording medium, a first focus mechanism configured to drive the objective lens in a focus direction, a second focus mechanism configured to change collimation of the second light incident to the objective lens and changing the focusing position of the second light independently of the first light, a first focus servo control unit configured to drive the first focus mechanism, an error signal subtraction unit configured to subtract the first focus error signal from a second focus error signal, and a second focus servo control unit configured to drive the second focus mechanism.
展开▼