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    • 14. 发明授权
    • Head positioning system for use in information recording/reproducing
device with means for deriving track crossing signal from tracking
error signal
    • 头定位系统,用于信息记录/再现装置,具有用于从跟踪误差信号导出跟踪交叉信号的装置
    • US5020044A
    • 1991-05-28
    • US300426
    • 1989-01-23
    • Shigeru Shimonou
    • Shigeru Shimonou
    • G11B7/085G11B21/08
    • G11B7/08517G11B21/085G11B7/08541
    • An optical disk system comprising a head positioning system for positioning a head at a desired one of the tracks of an optical disk, and a tracking servo system for maintaining the head at the track by detecting a tracking error signal indicating deflection of the head from the track. In order to accurately position the head to the desired track, a track crossing signal deriving circuit derives an alternating signal component having a frequency corresponding to track crossing of the head from the tracking error signal as a track crossing signal. The track crossing signal is converted to a pulse signal which is counted to produce a counted number as a track crossing number. The track crossing number is compared with a desired track number previously set and a position error signal is produced. A head driving motor is driven until the position error signal becomes zero so that the head is correctly positioned at the desired track. The track crossing signal is converted into a voltage signal as a velocity signal. A slew rate of the track crossing signal deriving circuit is controlled by the velocity signal so that the track crossing signal is reliably derived even if the track crossing velocity increases.
    • 一种光盘系统,包括头部定位系统,用于将光头定位在光盘的期望的一个轨道上;以及跟踪伺服系统,用于通过检测指示头部的偏转的跟踪误差信号来将头保持在轨道上 跟踪。 为了将磁头精确地定位到期望的轨道,轨道交叉信号导出电路将具有对应于磁头的跟踪轨迹的频率的交替信号分量从跟踪误差信号导出为轨道交叉信号。 轨道交叉信号被转换为脉冲信号,该脉冲信号被计数以产生作为轨道交叉数的计数。 将轨道交叉号与预先设定的期望轨道号进行比较,并产生位置误差信号。 驱动头驱动马达直到位置误差信号变为零,使得头部正确地定位在期望的轨道上。 轨道交叉信号作为速度信号被转换为电压信号。 轨道交叉信号导出电路的转换速率由速度信号控制,使得即使轨道交叉速度增加,也可靠地导出轨迹交叉信号。
    • 16. 发明授权
    • Beam access apparatus for optical disc system
    • 光盘系统光束存取装置
    • US4615023A
    • 1986-09-30
    • US765172
    • 1985-08-12
    • Hiroshi InadaTadashi NomuraShigeru Shimonou
    • Hiroshi InadaTadashi NomuraShigeru Shimonou
    • G11B7/085G11B7/09G11B21/10
    • G11B7/0901G11B7/08505Y10S358/907
    • A beam access apparatus for an optical disc system. The apparatus includes a lens position detector for generating a lens position signal indicating a position of the objective lens in a radial direction of the disc with respect to the optical head which is movable relative to the disc. The apparatus is operated in a head access mode in which the optical head is moved in the radial direction of the disc and the objective lens is caused to follow the movement of the optical head such that the objective lens is positioned at a predetermined location with respect to the optical head. The apparatus is also operable in a lens access mode wherein the objective lens is moved in the radial direction and the optical head is caused to follow the objective lens such that the objective lens is located at a predetermined position with respect to the optical head.
    • 一种用于光盘系统的光束存取装置。 该装置包括一个透镜位置检测器,用于产生一个透镜位置信号,该透镜位置信号指示相对于相对于光盘可移动的光学头的盘的径向方向的物镜的位置。 该装置以头部存取模式操作,其中光学头沿盘的径向移动,使物镜跟随光学头的移动,使得物镜相对于 到光学头。 该设备还可以在透镜访问模式下操作,其中物镜沿径向移动并且使光学头跟随物镜使得物镜相对于光学头位于预定位置。
    • 20. 发明授权
    • Optical disk apparatus and track access control method utilizing
positioned shift between scanning beams
    • 光盘装置和轨道存取控制方法利用位于扫描光束之间的位置
    • US5737282A
    • 1998-04-07
    • US607637
    • 1996-02-27
    • Shigeru Shimonou
    • Shigeru Shimonou
    • G11B7/0045G11B7/005G11B7/0055G11B7/085G11B11/105G11B17/22G11B11/00
    • G11B11/10571G11B11/10563G11B7/08541G11B7/08582G11B7/0045G11B7/005G11B7/0055
    • An optical disk apparatus includes first and second objective lenses, a carriage, a moving mechanism, a fixed optical system, a main control section, track access control circuits, a first positional shift correction circuit, a second positional shift correction circuit, first and second driving members, an arithmetic circuit, and a correction member. The first and second driving members slightly drive the first and second objective lenses in a track crossing direction in accordance with the first and second positional shift correction signals, respectively. The first and second positional shift correction circuits count first and second track position signals to output first and second positional error signals with respect to a target track, and output the first and second positional shift correction signals to the first and second driving members based on the first and second positional error signals and the first and second track position signals, respectively. The arithmetic circuit calculates a difference between the first and second positional error signals to output an inter-beam positional shift signal. The correction member corrects one of the first and second positional shift correction signals based on the inter-beam positional shift signal.
    • 光盘装置包括第一和第二物镜,滑架,移动机构,固定光学系统,主控制部分,轨道存取控制电路,第一位置偏移校正电路,第二位置偏移校正电路,第一和第二 驱动构件,运算电路和校正构件。 第一和第二驱动构件分别根据第一和第二位置偏移校正信号沿轨道交叉方向稍微驱动第一和第二物镜。 第一和第二位置偏移校正电路对第一和第二轨道位置信号进行计数,以相对于目标轨迹输出第一和第二位置误差信号,并且基于第一和第二位置偏移校正信号将第一和第二位置偏移校正信号输出到第一和第二驱动构件 第一和第二位置误差信号以及第一和第二轨道位置信号。 算术电路计算第一和第二位置误差信号之间的差以输出一个射束间位移信号。 校正构件基于射束间位置偏移信号来校正第一和第二位置偏移校正信号之一。