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    • 6. 发明申请
    • ROTATION DETECTOR
    • 旋转探测器
    • US20110084691A1
    • 2011-04-14
    • US12883144
    • 2010-09-15
    • Shuichi TAKEUCHI
    • Shuichi TAKEUCHI
    • G01B7/30G01B11/14
    • G01D5/2448G01D5/24476
    • A rotation detector includes a first distance sensor disposed to face a rotating body with a gear portion formed non-parallel to a rotation axis for continuously measuring a distance from the gear portion during rotation of the rotating body, a second distance sensor disposed at a position different from the first distance sensor in a direction of the rotation axis for continuously measuring a distance from the gear portion during rotation of the rotating body, and an axis shift detecting portion for detecting an axis shift of the rotation axis based on a variation in the distance measured by at least one of the first and second distance sensors.
    • 旋转检测器包括:第一距离传感器,被设置为面对旋转体,齿轮部分形成为不平行于旋转轴线,用于在旋转体旋转期间连续地测量与齿轮部分的距离,第二距离传感器设置在位置 与第一距离传感器在旋转轴的方向上不同,用于在旋转体的旋转期间连续地测量与齿轮部分的距离;以及轴移动检测部,用于基于旋转轴的变化来检测旋转轴的轴线偏移 由第一和第二距离传感器中的至少一个测量的距离。
    • 7. 发明授权
    • Optical disc drive and objective lens for the same
    • 光盘驱动器和物镜相同
    • US07839752B2
    • 2010-11-23
    • US11536004
    • 2006-09-28
    • Daisuke KoreedaKoichi MaruyamaShuichi TakeuchiYoshiyuki Tashiro
    • Daisuke KoreedaKoichi MaruyamaShuichi TakeuchiYoshiyuki Tashiro
    • G11B7/135
    • G11B7/1374G11B7/1275G11B7/13922G11B2007/0006
    • There is provided an optical disc drive for recordation/reproduction for three types of optical discs by selectively using one of three types of light beams. The optical disc drive comprises an objective lens. The objective lens has a step structure which gives an optical path length difference to an incident beam at each step. When the third laser beam passes through the objective lens, the objective lens produces normal diffraction order light converging to a recording surface of the third optical disc and undesired diffraction order light converging to a point deviating from the recording surface of the third optical disc. A distance from a point to which the normal diffraction order light converges to a point to which the undesired diffraction order light converges is larger than or equal to twice a pull-in range of a focus error signal obtained when the third optical disc is used.
    • 通过选择性地使用三种类型的光束之一,提供了用于三种类型的光盘的记录/再现的光盘驱动器。 光盘驱动器包括物镜。 物镜具有在每个步骤中给入射光束的光程长度差的阶梯结构。 当第三激光束通过物镜时,物镜产生会聚到第三光盘的记录表面的正常衍射级光,并且不期望的衍射级光会聚到偏离第三光盘的记录表面的点。 从法线衍射级光收敛到不期望的衍射级光会聚的点的距离大于或等于当使用第三光盘时获得的聚焦误差信号的拉入范围的两倍。
    • 10. 发明申请
    • OPTICAL PICK-UP
    • US20090052305A1
    • 2009-02-26
    • US12195639
    • 2008-08-21
    • Daisuke KOREEDAShuichi TAKEUCHI
    • Daisuke KOREEDAShuichi TAKEUCHI
    • G11B7/135
    • G11B7/13922G11B7/1353G11B7/1374G11B7/1376G11B2007/0006
    • There is provided an optical pick-up including first to third light sources respectively emitting first to third light beams, a first coupling lens, and an objective lens formed to converge each of the first, second and third light beams onto the first, second and third optical discs, respectively. The objective lens has a step structure including a plurality of concentrically formed refractive surface zones divided by steps, the step structure having a function of giving, at each step, an optical path length difference of approximately 2λ1 to the first light beam. The first coupling lens causes the first light beam to be incident on the objective lens as a converging beam. The objective lens is positioned to satisfy a condition: −0.35
    • 提供了包括分别发射第一至第三光束的第一至第三光源的光学拾取器,第一耦合透镜和物镜,其将第一,第二和第三光束中的每一个会聚到第一,第二和第二光束上, 第三光盘。 物镜具有阶梯结构,其包括多个同心形成的折射表面区域,该台阶结构具有在每个步骤中给予大约2λ1与第一光束的光程差的功能。 第一耦合透镜使第一光束作为会聚光束入射到物镜上。 物镜被定位成满足条件:<?in-line-formula description =“In-line Formulas”end =“lead”?> -0.35