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    • 100. 发明申请
    • Objective lens unit and optical pickup device
    • 物镜单元和光学拾取装置
    • US20070067788A1
    • 2007-03-22
    • US11507002
    • 2006-08-21
    • Shogo YamamotoYuichi AtarashiYasutaka Nakagaki
    • Shogo YamamotoYuichi AtarashiYasutaka Nakagaki
    • G11B7/00
    • G11B7/0935G11B7/1353G11B7/1374G11B2007/0006
    • An objective lens unit, includes: an objective lens for irradiating and converging laser light on an optical disc as an a light information recording medium; and a lens frame for retaining the objective lens, wherein the lens frame is structured so that at least a portion closer to a rotation center of the optical disc is offset to an inner side of the lens frame with regards to a virtual edge section closer to the rotation center of the optical disc, wherein the virtual edge section is in a nodal line of a virtual plane that includes an end face which is closest to the optical disc in the lens frame and the objective lens, and that is perpendicular to an optical axis and a virtual rotation curved surface that is obtained when a virtual straight line passing a portion which is farthest from the optical axis in the lens frame and the objective lens, in parallel with the optical axis, is rotated around the optical axis as a center axis.
    • 一种物镜单元,包括:用于将激光照射并会聚在作为光信息记录介质的光盘上的物镜; 以及用于保持物镜的透镜框架,其中,所述透镜框架被构造成使得靠近所述光盘的旋转中心的至少一部分相对于靠近所述透镜框架的虚拟边缘部分偏移到所述透镜框架的内侧 光盘的旋转中心,其中虚拟边缘部分在虚拟平面的节点线中,虚拟平面包括最靠近透镜框架和物镜中的光盘的端面,并且垂直于光学 并且当通过透镜框中的光轴最远的部分的虚拟直线和与光轴平行的物镜时,虚拟直线以围绕光轴为中心旋转而获得的虚拟旋转曲面 轴。