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    • 12. 发明授权
    • Objective lens actuator and a thin-sized optical pickup with magnetic circuit having different lengthed magnets
    • 物镜致动器和具有磁路的薄型光学拾取器,具有不同的磁头
    • US08199613B2
    • 2012-06-12
    • US12542070
    • 2009-08-17
    • Seiichi KatoKatsuhiko KimuraTakahiro YamaguchiYoshiro Konishi
    • Seiichi KatoKatsuhiko KimuraTakahiro YamaguchiYoshiro Konishi
    • G11B7/09
    • H02K41/0356G02B7/08G11B7/0933G11B7/0956
    • An objective lens actuator, being suitable for a thin-sized optical pickup and a thin-sized optical disc apparatus, comprises: an objective lens for focusing a light upon a recording surface of an optical disc; and a driving mechanism including a focusing coil, tracking coils, and a magnetic circuit, for operating the objective lens into a focusing direction of approaching/receding to/from the optical disc, and into a tracking direction of a radius of the optical disc, wherein the magnetic circuit has a first magnet and a second magnet putting the objective lens therebetween, and one of the magnets is short of length in the focusing direction and is long in length in the tracking direction, comparing to the other magnet, thereby bringing an unnecessary moment, which is applied upon a moving part including the objective lens therein, to be small, and suppressing inclination or tilt and vibration of the objective lens.
    • 适用于薄型光学拾取器和薄型光盘装置的物镜致动器包括:用于将光聚焦在光盘的记录表面上的物镜; 以及包括聚焦线圈,跟踪线圈和磁路的驱动机构,用于将物镜操作到接近/退出到光盘的聚焦方向,并且进入光盘的半径的跟踪方向, 其特征在于,所述磁路具有第一磁体和将所述物镜放置在其间的第二磁体,并且与所述另一磁体相比,所述磁体中的一个在聚焦方向上的长度短,并且在跟踪方向长度较长, 在包括物镜的移动部件上施加的不必要的力矩小,并且抑制物镜的倾斜或倾斜和振动。