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    • 5. 发明授权
    • Pickup actuator
    • 拾取执行器
    • US06584047B1
    • 2003-06-24
    • US09442460
    • 1999-11-18
    • Seok-jung KimByung-ryul RyooYong-ki SonYong-hoon Lee
    • Seok-jung KimByung-ryul RyooYong-ki SonYong-hoon Lee
    • G11B700
    • G11B7/0935G11B7/093G11B7/0933
    • A pickup actuator capable of significantly reducing rolling of the area, including: a pickup base, a lens holder having an objective lens mounted thereon, and lens holder driving means for driving the lens holder in directions for focusing and tracking on the pickup base. The lens holder driving means includes at least one magnet, a yoke for concentrating the magnetic flux of the magnet in the direction of the magnetic flux, and a driving coil having a focusing coil and a pair of tracking coils positioned between the magnet and the yoke. The respective widths of the magnet and the yoke are set at a rate of 1:0.8-1.2. Accordingly, the uniform magnetic flux area of the magnetic flux can be widely distributed in the width's direction of the yoke. Further, the magnet is attached to one side of one yoke while being slightly lowered thereon, so that the center of the magnetic flux of the magnet is downwardly moved from its initial position to a distance corresponding to 4-12% of the height of the magnet, and the center line of the magnetic flux of the magnet and the center line of the focusing coil are aligned with each other, exactly. Further, the width of the magnet and the gap between the pair of tracking coils are set at a rate of 1:0.6-0.9. Accordingly, the portions of the pair of tracking coils intersecting the effective magnetic flux area are positioned in the area where the density of the magnetic flux is low, so that the force in the focusing direction by the tracking coils can be reduced.
    • 一种能够显着地减少该区域的滚动的拾取致动器,包括:拾取器基座,其上安装有物镜的透镜保持器和用于在拾取器基座上朝向聚焦和跟踪的方向驱动透镜保持器的透镜保持器驱动装置。 透镜保持器驱动装置包括至少一个磁体,用于在磁通方向上集中磁体的磁通的磁轭,以及具有聚焦线圈和位于磁体和磁轭之间的一对跟踪线圈的驱动线圈 。 磁体和磁轭的相应宽度设定为1:0.8-1.2的速率。 因此,磁通的均匀磁通面积可以宽度分布在磁轭的宽度方向上。 此外,磁体被附着在一个磁轭的一侧同时稍微降低,使得磁体的磁通量的中心从其初始位置向下移动到对应于高度的4-12%的距离 磁体,磁铁的磁通量和聚焦线圈的中心线的中心线彼此对准。 此外,磁体的宽度和一对跟踪线圈之间的间隙设定为1:0.6-0.9的比率。 因此,与有效磁通区域相交的一对跟踪线圈的部分位于磁通密度较低的区域,从而可以减小由跟踪线圈聚焦的力。
    • 6. 发明授权
    • Error signal detecting apparatus of optical pickup adopting hologram
grating
    • 采用全息光栅的光学拾取器的误差信号检测装置
    • US6167004A
    • 2000-12-26
    • US433296
    • 1999-11-03
    • Yong-jae LeeTae-Kyung KimPyong-yong SeongJang-hoon YooByung-ryul RyooYong-ki SonSeok-jung Kim
    • Yong-jae LeeTae-Kyung KimPyong-yong SeongJang-hoon YooByung-ryul RyooYong-ki SonSeok-jung Kim
    • G11B7/09G11B7/13G11B7/135G11B7/00
    • G11B7/131G11B7/094G11B7/0943G11B7/133G11B7/1353
    • An error signal detecting apparatus for an optical pickup employing a hologram grating, including a sensing lens for focusing light reflected from a recording medium, a hologram grating having first through fourth pattern regions arranged clockwise in a 2.times.2 matrix arrangement, for diffracting light incident from the sensing lens in different directions, wherein the first through fourth pattern regions a, b, c and d are formed such that a first focus of the +1st-order diffracted beams diffracted by the first and third pattern regions is relatively farther from the sensing lens than a second focus of the +1st-order diffracted beams diffracted by the second and fourth pattern regions, a photodetector disposed between the first and second focuses and having first through fourth light receiving units, for receiving the beams diffracted by the first through fourth pattern regions and independently photoelectrically converting the same, and a signal operation unit for detecting a focus error signal and/or a track error signal from detection signals of the light receiving parts. The error signal detecting apparatus can suppress generation of an offset of a focus error signal due to a change in the wavelength of a light source and an offsets of the focus error signal and track offset signal due to deviations of the photodetector.
    • 一种用于采用全息光栅的光学拾取器的误差信号检测装置,包括用于聚焦从记录介质反射的光的感测透镜,具有以2x2矩阵排列顺时针排列的第一至第四图案区域的全息图光栅,用于衍射从 感光透镜,其中第一至第四图案区域a,b,c和d被形成为使得由第一和第三图案区域衍射的+ 1级衍射光束的第一焦点相对较远离感测透镜 比由第二和第四图案区域衍射的+ 1级衍射光束的第二焦点,设置在第一和第二焦点之间并具有第一至第四光接收单元的光电检测器,用于接收由第一至第四图案衍射的光束 区域并独立地对其进行光电转换;以及信号操作单元,用于检测聚焦误差 信号和/或来自光接收部分的检测信号的轨道误差信号。 误差信号检测装置可以抑制由于光源的波长的变化引起的聚焦误差信号的偏移的产生以及由于光电检测器的偏差引起的聚焦误差信号和光道偏移信号的偏移。
    • 8. 发明授权
    • Optical pickup movable to control beam shift and field angle in an optical disk drive
    • 光拾取器可移动以控制光盘驱动器中的光束偏移和场角
    • US06381207B1
    • 2002-04-30
    • US09410627
    • 1999-10-01
    • Byung-ryul RyooPyong-yong SeongSeok-jung KimYong-ki SonTae-kyung KimYong-jae LeeJang-hoon Yoo
    • Byung-ryul RyooPyong-yong SeongSeok-jung KimYong-ki SonTae-kyung KimYong-jae LeeJang-hoon Yoo
    • G11B3302
    • G11B7/22
    • An optical pickup of an optical disk drive. The optical pickup includes a laser beam source for generating a laser beam; a pickup base having an objective lens for projecting the laser beam generated from the laser beam source to an information recording surface of an optical disk; a variation adjusting plate which is movably disposed on the pickup base to be moved in vertical and lateral directions, and has a rotational hole formed at a central portion thereof; and a rotation adjusting plate including a rotational section having a predetermined curvature which is inserted into the rotational hole of the variation adjusting plate, and with a laser beam source fixed therein, the rotation adjusting plate being rotated with respect to the variation adjusting plate. An optical system including a collimating lens and a reflective mirror is fixed to the pickup base. Since the light path with respect to the field angle and the beam shift is adjusted by moving and/or rotating the light emitting point of the laser beam source with respect to the light axis of the collimating lens, the size of the optical pickup becomes smaller. Further, since the collimating lens and the light source are fixed to the respective structures, the light path is controlled regardless of the focal distance of the collimating lens. Accordingly, if the focal distance of the collimating lens has to be lengthened, the beam shift and the field angle can be precisely adjusted without enlarging the optical pickup.
    • 光盘驱动器的光学拾取器。 光学拾取器包括用于产生激光束的激光束源; 具有用于将从激光束源产生的激光束投射到光盘的信息记录表面的物镜的拾取器基座; 可移动地设置在拾取器基座上以在垂直和横向方向上移动的变化调节板,并且具有形成在其中心部分的旋转孔; 以及旋转调节板,其包括插入到变化调节板的旋转孔中的具有预定曲率的旋转部分和固定在其中的激光束源,旋转调节板相对于变化调节板旋转。 包括准直透镜和反射镜的光学系统固定在拾取器基座上。 由于通过相对于准直透镜的光轴移动和/或旋转激光束源的发光点来调节相对于场角和光束偏移的光路,所以光拾取器的尺寸变小 。 此外,由于准直透镜和光源被固定到各个结构,所以不管准直透镜的焦距如何,都可以控制光路。 因此,如果准直透镜的焦距必须延长,则可以在不放大光学拾取器的情况下精确地调整光束偏移和场角。