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    • 8. 发明申请
    • OPTICAL DISC APPARATUS
    • 光盘设备
    • US20090175140A1
    • 2009-07-09
    • US12343611
    • 2008-12-24
    • Toshiteru NakamuraMotoyuki SuzukiFumio Isshiki
    • Toshiteru NakamuraMotoyuki SuzukiFumio Isshiki
    • G11B20/10
    • G11B20/10009G11B7/0901G11B2007/0013G11B2220/235G11B2220/2537
    • An optical disc apparatus which detects an envelope of a tracking error signal in a record or playback mode of an optical disc having recording layers of a multilayer structure, which quantifies a variation caused by multilayer interference (to ΔTES), and which restricts a recording or playback rate when a relationship ΔTES>Vth is satisfied for a predetermined threshold Vth. With such an arrangement, degradation of a recording or reproducing performance or generation of running-off-track resulting from a variation in the tracking error signal caused by stray light reflected by ones of recording layers of the optical disc which are not a recording or reproducing target layer can be suppressed, and a good recording or playback quality can be obtained even in such an optical disc having the plurality of recording layers laminated therein.
    • 一种光盘装置,其检测具有多层结构的记录层的光盘的记录或重放模式中的跟踪误差信号的包络,其量化由多层干涉(对DeltaTES)引起的变化,并且限制了记录或 当对于预定阈值Vth满足DeltaTES> Vth的关系时的重放速率。 通过这样的布置,由于由不是记录或再现的光盘的记录层反射的杂散光引起的跟踪误差信号的变化而导致记录或再现性能的劣化或产生跑步轨迹 可以抑制目标层,并且即使在其中层叠有多个记录层的光盘中也可以获得良好的记录或播放质量。
    • 9. 发明申请
    • Optical disk apparatus and optical pickup
    • 光盘装置和光学拾取器
    • US20050052964A1
    • 2005-03-10
    • US10879779
    • 2004-06-30
    • Shinji FujitaFumio IsshikiNobuyuki Maeda
    • Shinji FujitaFumio IsshikiNobuyuki Maeda
    • G11B7/085G11B7/00G11B7/09G11B7/125G11B7/135
    • G11B7/13925G11B7/1369G11B7/1378G11B2007/13727
    • A method and an optical disk apparatus that can accurately and stably correct the spherical aberration even for a blank write-once optical disk and can detect a spherical aberration error signal with a simple construction of parts in real time. In a blank write-once disk 20, the tracking servo is switched to an inoperative state, push-pull signals from outputs of the photodetector 12 are detected in a state of “in focus” and in a state of “out focus,” respectively, by a push-pull signal generation circuit 34, and the amplitudes of these push-pull signals are subjected to difference calculation in a spherical aberration error detector 31 to obtain a spherical aberration error signal A. Then, the spherical aberration is corrected with this spherical aberration error signal A, and subsequently a specific pattern signal is recorded in a trial writing area, this signal is reproduced in the state of “in focus” and in the state of “out focus,” respectively, the amplitude of each reproduced signal is acquired by a reproduced signal generation circuit 32, these amplitudes are subjected to difference calculation in the spherical aberration error detector 31 to obtain a spherical aberration error signal B. The spherical aberration is corrected with this.
    • 一种方法和光盘装置,即使对于空白一次写入光盘也能够准确且稳定地校正球面像差,并且可以实时地以简单的部件构造来检测球面像差误差信号。 在空白的一次写入盘20中,跟踪伺服被切换到不工作状态,在“对焦”的状态下分别检测来自光检测器12的输出的推挽信号,处于“熄焦”的状态 通过推挽信号产生电路34,并且在球面像差误差检测器31中对这些推挽信号的幅度进行差分计算,以获得球面像差误差信号A.然后,用这种方法校正球面像差 球面像差误差信号A,随后的特定图案信号被记录在试写区域中,该信号分别以“对焦”的状态再现,并且在“对焦”的状态下再现,每个再现信号的幅度 由再现信号生成电路32获取,在球面像差误差检测器31中对这些振幅进行差分运算,得到球面像差误差信号B.球面像差为co 与此搭起来
    • 10. 发明授权
    • Optical disc drive, optical pickup and optical component used therefor
    • 光盘驱动器,光拾取器和用于此的光学元件
    • US08004956B2
    • 2011-08-23
    • US12053797
    • 2008-03-24
    • Fumio IsshikiKatsuhiko Izumi
    • Fumio IsshikiKatsuhiko Izumi
    • G11B7/135
    • G11B7/1275G11B7/1356G11B7/22G11B2007/0006G11B2007/0013
    • Provided are an optical pick up and an optical component used for the optical pickup which are capable of preventing or restraining occurrence of deviation and unbalance which are caused by assembly errors during manufacturing of optical components, a temperature variation or the like. The optical pickup comprises a laser, a polarization changeover element for changing over a direction of polarization of an optical beam emitted from the laser, a beam splitting element for splitting the laser beam into a plurality of optical paths in accordance with a direction of a polarization, a plurality of objective lenses for focusing laser beams onto a recording layer of the optical disc, a rise-up mirror, and a plurality of coupling lenses arranged respectively intermediate of the plurality of optical paths led to the plurality of objective lenses. The rise-up mirror is arranged intermediate of the plurality of optical paths led to the plurality of objective lenses and adapted to be used common to respective optical beams on the plurality of optical paths. The plurality of the coupling lenses are coupled to and held on one and the same drive portion.
    • 提供了一种用于光学拾取器的光拾取器和光学部件,其能够防止或限制由光学部件制造期间的组装误差,温度变化等引起的偏差和不平衡的发生。 光拾取器包括激光器,用于切换从激光器发射的光束的偏振方向的偏振转换元件,用于根据偏振方向将激光束分成多个光路的分束元件 用于将激光束聚焦到光盘的记录层上的多个物镜,上升反射镜和分别设置在被引导到多个物镜的多个光路之间的多个耦合透镜。 上升反射镜被布置在被引导到多个物镜的多个光路中间,并且适用于多个光路上的相应光束共同使用。 多个耦合透镜联接并保持在同一个驱动部分上。