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    • 1. 发明授权
    • Disk unit and manufacturing method thereof
    • 磁盘单元及其制造方法
    • US07423825B2
    • 2008-09-09
    • US11172199
    • 2005-06-29
    • Naoki ShimamuraOsama TakazawaKaoru UmemuraKazuhiko Washizu
    • Naoki ShimamuraOsama TakazawaKaoru UmemuraKazuhiko Washizu
    • G11B27/36
    • G11B5/59605G11B5/56G11B27/36G11B2220/20
    • A disk unit is capable of detecting a track, the track width of which deviates from a normal value, with high accuracy at high speed. A HDD includes a read head, a disk and defective-track detecting part. The disk has servo data including bursts A, B written thereon. The servo data is used to position the read head to a track center. The defective-track detecting part detects a defective track as below. The sum of the amplitude of bursts A and B, which have been read by the read head by one read operation, is divided by the amplitude of a burst C or D to obtain a compared value. If the compared value deviates from a criterion by a specified percentage or more, it is judged that the track width of a track is abnormal. Since bursts A through D are written without trimming, the size of bursts A through D in the track width direction are kept constant regardless of the track width. Accordingly, a gap G fluctuating in accordance with the track width is formed in the radial direction between bursts A and B. Bursts A and B are read at a position including gap G, and the above-mentioned compared value is determined, and thereby a defective track is detected.
    • 磁盘单元能够以高速度高精度地检测轨道宽度偏离正常值的轨道。 HDD包括读取头,盘和缺陷轨迹检测部。 磁盘具有写入其上的脉冲串A,B的伺服数据。 伺服数据用于将读取头定位到轨道中心。 缺陷轨迹检测部分检测如下的缺陷轨迹。 由读取头通过一次读取操作读取的脉冲串A和B的幅度之和除以突发C或D的幅度以获得比较值。 如果比较值与标准偏差达指定百分比以上,则判断轨道的轨迹宽度异常。 由于脉冲串A至D在不进行调整的情况下被写入,所以在轨道宽度方向上的脉冲串A至D的大小与轨道宽度无关。 因此,在突发A和B之间沿径向方向形成根据磁道宽度波动的间隙G.在包括间隙G的位置处读取突发A和B,并且确定上述比较值,由此 检测到有缺陷的轨迹。
    • 2. 发明申请
    • Disk unit and manufacturing method thereof
    • 磁盘单元及其制造方法
    • US20050286156A1
    • 2005-12-29
    • US11172199
    • 2005-06-29
    • Naoki ShimamuraOsama TakazawaKaoru UmemuraKazuhiko Washizu
    • Naoki ShimamuraOsama TakazawaKaoru UmemuraKazuhiko Washizu
    • G11B5/56G11B5/596G11B27/36
    • G11B5/59605G11B5/56G11B27/36G11B2220/20
    • A disk unit is capable of detecting a track, the track width of which deviates from a normal value, with high accuracy at high speed. A HDD includes a read head, a disk and defective-track detecting part. The disk has servo data including bursts A, B written thereon. The servo data is used to position the read head to a track center. The defective-track detecting part detects a defective track as below. The sum of the amplitude of bursts A and B, which have been read by the read head by one read operation, is divided by the amplitude of a burst C or D to obtain a compared value. If the compared value deviates from a criterion by a specified percentage or more, it is judged that the track width of a track is abnormal. Since bursts A through D are written without trimming, the size of bursts A through D in the track width direction are kept constant regardless of the track width. Accordingly, a gap G fluctuating in accordance with the track width is formed in the radial direction between bursts A and B. Bursts A and B are read at a position including gap G, and the above-mentioned compared value is determined, and thereby a defective track is detected.
    • 磁盘单元能够以高速度高精度地检测轨道宽度偏离正常值的轨道。 HDD包括读取头,盘和缺陷轨迹检测部。 磁盘具有写入其上的脉冲串A,B的伺服数据。 伺服数据用于将读取头定位到轨道中心。 缺陷轨迹检测部分检测如下的缺陷轨迹。 由读取头通过一次读取操作读取的脉冲串A和B的幅度之和除以突发C或D的幅度以获得比较值。 如果比较值与标准偏差达指定百分比以上,则判断轨道的轨迹宽度异常。 由于脉冲串A至D在不进行调整的情况下被写入,所以在轨道宽度方向上的脉冲串A至D的大小与轨道宽度无关。 因此,在突发A和B之间沿径向方向形成根据磁道宽度波动的间隙G.在包括间隙G的位置处读取突发A和B,并且确定上述比较值,由此 检测到有缺陷的轨迹。
    • 10. 发明授权
    • Focused ion beam apparatus and aperture
    • 聚焦离子束装置和孔径
    • US07189982B2
    • 2007-03-13
    • US11205086
    • 2005-08-17
    • Yuichi MadokoroShigeru IzawaKaoru UmemuraHiroyasu Kaga
    • Yuichi MadokoroShigeru IzawaKaoru UmemuraHiroyasu Kaga
    • H01J37/08
    • H01J37/09H01J2237/022H01J2237/0805H01J2237/3109
    • In an aperture for use in an ion beam optical system having its surface coated with a liquid metal, instability of an ion source attributable to sputtering and re-deposition of an aperture base material is prevented. A focused ion beam apparatus using a liquid metal ion source has an aperture for limiting an ion beam diameter. The aperture has a vessel formed with a recess having, at its surface lowermost point, an aperture hole through which the ion beam passes and a liquid metal mounted on the recess, the liquid metal being used for the liquid metal ion source. Preferably, the aperture may be minimized in area of aperture entrance hole inner surface which exposes the base material by tapering an aperture hole portion, by which the ion beam passes, on the downstream side.
    • 在用于其表面涂覆有液态金属的离子束光学系统的孔中,防止归因于溅射的离子源的不稳定性和孔基材的再沉积。 使用液体金属离子源的聚焦离子束装置具有用于限制离子束直径的孔。 孔具有形成有凹槽的容器,凹槽在其表面的最低点处具有离子束通过的孔眼和安装在凹部上的液态金属,液态金属用于液体金属离子源。 优选地,孔径可以在孔径入口孔内表面的面积中最小化,孔面内表面通过使下游侧的离子束通过的孔眼部分变细而露出基底材料。