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    • 28. 发明申请
    • Optical Data Storage System and Method of Optical Recording and/or Reading
    • 光学数据存储系统和光学记录和/或读取方法
    • US20080279064A1
    • 2008-11-13
    • US10599991
    • 2005-04-15
    • Martinus Bernardus Van Der MarkFerry Zijp
    • Martinus Bernardus Van Der MarkFerry Zijp
    • G11B5/09G11B7/135
    • G11B7/1374G11B7/0908G11B7/1387G11B2007/13727
    • An optical data storage system for recording and/or reading, using a radiation beam having a wavelength X is described. The radiation beam is focused onto a data storage layer of an optical data storage medium. The medium has a cover layer that is transparent to the focused radiation beam. The cover layer has a thickness h smaller than 5 μm. A cover layer with thickness variation of substantially less than the focal depth, i.e. 50 nm, eliminates the need of dynamic focus control of the objective which is otherwise required in addition to the gap servo. Further a method of optical recording is described using such an optical data storage system by which a static focus control and spherical aberration correction to accommodate medium-to-medium variance is achieved. The static focus control can be realised by optimising the modulation depth of a known signal, e.g. from a lead-in track.
    • 描述了使用具有波长X的辐射束进行记录和/或读取的光学数据存储系统。 辐射束被聚焦到光学数据存储介质的数据存储层上。 介质具有对聚焦辐射束透明的覆盖层。 覆盖层的厚度h小于5um。 具有基本上小于焦深(即50nm)的厚度变化的覆盖层消除了除了间隙伺服以外另外需要的物镜的动态聚焦控制的需要。 此外,使用这样的光学数据存储系统来描述光学记录的方法,通过该光学数据存储系统实现了适应中等到中等方差的静态聚焦控制和球面像差校正。 静态聚焦控制可以通过优化已知信号的调制深度来实现,例如, 从导入轨道。
    • 29. 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。