公开(公告)号：US20080267042A1

公开(公告)日：2008-10-30

申请号：US12108908

申请日：2008-04-24

申请人： Yasuyuki KANO ,  Satomi Osugi ,  Tetsuhisa Hosokawa

发明人： Yasuyuki KANO ,  Satomi Osugi ,  Tetsuhisa Hosokawa

IPC分类号： G11B7/135

CPC分类号： G11B7/1365 ,  G11B7/1356 ,  G11B7/1374 ,  G11B2007/0006

摘要： A quarter-wave plate and a polarization beam splitter are used as means for guiding a laser beam to first and second objective lenses. A half of the circularly-polarized laser beam incident to the polarization beam splitter is reflected in the form of an S-polarized light component by the polarization beam splitter and guided to a first objective lens, and the other half is transmitted through the polarization beam splitter in the form of a P-polarized light component and guided to a second objective lens. The whole of light quantity of the laser beam reflected from an optical disk through the first or second objective lens passes substantially through the polarization beam splitter. Therefore, the light quantity of the laser beam guided to a photodetector can be enhanced.

摘要翻译： 四分之一波片和偏振分束器用作将激光束引导到第一和第二物镜的装置。 入射到偏振分束器的圆偏振激光束的一半被偏振分束器以S偏振光分量的形式反射并被引导到第一物镜，另一半透射通过偏振束 分离器以P偏振光分量的形式被引导到第二物镜。 从光盘通过第一或第二物镜反射的激光束的整个光量基本上通过偏振分束器。 因此，可以提高引导到光电检测器的激光束的光量。

公开(公告)号：US20080186834A1

公开(公告)日：2008-08-07

申请号：US12024450

申请日：2008-02-01

申请人： Yasuyuki KANO ,  Kenji Nagatomi

发明人： Yasuyuki KANO ,  Kenji Nagatomi

IPC分类号： G11B7/00

CPC分类号： G11B7/0943 ,  G11B7/1365 ,  G11B7/1374 ,  G11B7/1392 ,  G11B7/1395 ,  G11B2007/0006

摘要： A half-wave plate is attached to a lens holder holding a collimator lens, and a servo operation to the collimator lens and insertion and retraction of the half-wave plate in and from an optical path of a laser beam are performed by a common actuator. When the lens holder is moved to a servo position, the half-wave plate is inserted in and retracted from the optical path of the laser beam. Therefore, the laser beam is formed in S-polarized light or P-polarized light with respect to a polarization beam splitter, and the laser beam is guided to a first objective lens or a second objective lens.

摘要翻译： 将半波片连接到保持准直透镜的透镜保持器，并且对准直透镜进行伺服操作，并且半波片在激光束的光路中和从激光束的光路中的插入和缩回通过公共致动器 。 当透镜保持架移动到伺服位置时，半波片插入激光束的光路中并从其中退出。 因此，激光束相对于偏振分束器以S偏振光或P偏振光形成，激光束被引导到第一物镜或第二物镜。