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    • 31. 发明申请
    • Focus Control Scheme with Jumping Focal Point
    • 焦点控制方案与跳跃焦点
    • US20080232216A1
    • 2008-09-25
    • US10597182
    • 2005-01-10
    • Ferry ZijpMartinus Bernardus Van Der Mark
    • Ferry ZijpMartinus Bernardus Van Der Mark
    • G11B5/58
    • G11B7/08511G11B2007/0013
    • The present invention relates to a focus control apparatus and method of controlling focus of a radiation beam onto a first spatial level of a record carrier, wherein a focus control loop is locked onto a reflection signal obtained from a second spatial level located at a predetermined distance from said first spatial level, and is then opened to move an objective means towards the second spatial level by a predetermined amount related to the predetermined distance. This stepwise procedure enlarges the margin for mechanical overshoot and hence reduces the risk of bumping into the disc. Additionally, no ambiguous focus error signals are detected and robustness of initial focusing is improved if a thin transparent cover layer is present.
    • 本发明涉及一种将辐射束的焦点控制在记录载体的第一空间水平上的聚焦控制装置和方法,其中聚焦控制环被锁定在从位于预定距离处的第二空间水平获得的反射信号上 从所述第一空间水平开始,然后打开以使目标装置朝向第二空间水平移动与预定距离相关的预定量。 这种逐步程序扩大了机械过冲的余量,从而降低了撞击盘的风险。 此外,如果存在薄的透明覆盖层,则不会检测到模糊的聚焦误差信号,并且改善初始聚焦的鲁棒性。