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    • 1. 发明公开
    • 확장된 초점 제어
    • 扩展焦点控制
    • KR1020060006968A
    • 2006-01-20
    • KR1020057021762
    • 2004-05-12
    • 코닌클리케 필립스 엔.브이.
    • 구센스헨드릭제이.페닝프랑크씨.
    • G11B7/09
    • G11B7/0946G11B7/0908G11B7/095
    • An apparatus for scanning a track on a record carrier has a head (41) for providing a beam of radiation and generating at least one sensor signal. The device has a focusing unit for controlling a focusing element to maintain an in-focus position for generating a focused spot on the track. The sensor signal is converted into a displacement signal by a multitude of piecewise converters (42,43, 44), each converter converting a range of the sensor signal values into a position signal, and selection means (46) for selecting one of the position signals as the displacement signal based on an estimated displacement.
    • 用于在记录载体上扫描轨道的装置具有用于提供辐射束并产生至少一个传感器信号的头部(41)。 该装置具有聚焦单元,用于控制聚焦元件以保持聚焦位置,以在轨道上产生聚焦点。 传感器信号通过多个分段转换器(42,43,44)转换成位移信号,每个转换器将传感器信号值的范围转换成位置信号,以及选择装置(46),用于选择位置 基于估计的位移信号作为位移信号。