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    • 34. 发明授权
    • Rotation detector
    • 旋转检测器
    • US08436606B2
    • 2013-05-07
    • US12883144
    • 2010-09-15
    • Shuichi Takeuchi
    • Shuichi Takeuchi
    • G01B7/30
    • 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。
    • 36. 发明授权
    • Optical system for optical disc
    • 光盘光学系统
    • US07839731B2
    • 2010-11-23
    • US11014034
    • 2004-12-17
    • Shuichi Takeuchi
    • Shuichi Takeuchi
    • G11B7/00
    • G11B7/0956G11B2007/0006
    • There is provided an optical system for an optical disc which requires a numerical aperture larger than or equal to 0.60. The optical system is provided with a light source, an objective lens, and a driving system that controls a position and an attitude of the objective lens. The driving system operates to move the objective lens in a direction perpendicular to a central axis of the objective lens for a tracking operation, and to change the attitude of the objective lens during the tracking operation so that the central axis on a light source side tilts toward the light source.
    • 提供了一种光盘的光学系统,其需要大于或等于0.60的数值孔径。 光学系统设置有光源,物镜和控制物镜的位置和姿态的驱动系统。 驱动系统操作以使物镜沿垂直于物镜的中心轴线的方向移动用于跟踪操作,并且在跟踪操作期间改变物镜的姿态,使得光源侧的中心轴倾斜 朝向光源。
    • 40. 发明授权
    • Optical system for optical head
    • 光学头光学系统
    • US07158468B2
    • 2007-01-02
    • US09962301
    • 2001-09-26
    • Shuichi TakeuchiKoichi Maruyama
    • Shuichi TakeuchiKoichi Maruyama
    • G11B7/135
    • G02B5/1895G02B27/0037G02B27/4238G11B7/1275G11B7/1353G11B7/1374G11B7/139G11B2007/0006
    • An optical system for an optical head of an optical disc drive is capable of using first and second discs, protective layer of the second disc being thicker than that of the first disc, a data density of the second disc being lower than that of the first disc. A light source selectively emits first and second laser beams having first and second wavelengths, respectively. An objective lens converges the first and second beams on the first and second discs, respectively. The second beam is incident on the objective lens as diverging light, and the first beam is incident on the objective lens as a beam of which degree of divergence is smaller. A diffraction lens structure is formed in the high NA exclusive area, which compensates for aberrations of a portion of the first laser beam, and causes aberrations to a portion of the second laser beam passed therethrough.
    • 用于光盘驱动器的光头的光学系统能够使用第一和第二光盘,第二光盘的保护层比第一光盘的保护层厚,第二光盘的数据密度低于第一光盘的数据密度 光盘。 光源分别选择性地发射具有第一和第二波长的第一和第二激光束。 物镜分别将第一和第二光束会聚在第一和第二光盘上。 第二光束作为发散光入射在物镜上,第一光束作为发散度较小的光束入射到物镜上。 在高NA专用区域中形成衍射透镜结构,其补偿第一激光束的一部分的像差,并且引起通过其中的第二激光束的一部分的像差。