公开(公告)号：US20080297941A1

公开(公告)日：2008-12-04

申请号：US12128156

申请日：2008-05-28

申请人： Masao FUJITA ,  Kenji TANAKA ,  Sadamu KUSE

发明人： Masao FUJITA ,  Kenji TANAKA ,  Sadamu KUSE

IPC分类号： G11B21/02

CPC分类号： G11B5/00813 ,  G11B5/02 ,  G11B5/022 ,  G11B2005/0005

摘要： A data recording apparatus of the present invention includes a head that records data signals by magnetizing a magnetic tape 10 and a recording control portion that controls the recording operation by causing recording current to flow to the head. The recording control portion controls the operation of the head, so that in the magnetic tape 10, which is direct current demagnetized continuously in the longitudinal direction, a magnetic field is formed intermittently in an opposite direction to the magnetization direction of the direct current demagnetization. Thus, when recording data signals on the magnetic recording medium, it is possible to make the current flowing to the head small and to realize apparatus power consumption reductions, load reductions for the head and circuitry, and reduction in crosstalk noise from the head chip used for writing to the head chip used for reading.

摘要翻译： 本发明的数据记录装置包括通过磁化磁带10记录数据信号的磁头和通过使记录电流流向磁头而控制记录操作的记录控制部分。 记录控制部分控制磁头的操作，使得在沿着纵向方向连续地退磁的磁带10中，在与直流退磁的磁化方向相反的方向间歇地形成磁场。 因此，当在磁记录介质上记录数据信号时，可以使流过头部的电流变小，并实现设备功耗降低，头部和电路的负载降低，以及减少来自头部芯片的串扰噪声 用于写入用于阅读的头部芯片。

公开(公告)号：US20110292539A1

公开(公告)日：2011-12-01

申请号：US13115163

申请日：2011-05-25

申请人： Masao FUJITA ,  Sadamu Kuse

发明人： Masao FUJITA ,  Sadamu Kuse

IPC分类号： G11B15/48 ,  G11B5/584

CPC分类号： G11B5/4893 ,  G11B5/00813 ,  G11B5/40

摘要： A magnetic tape driving apparatus, which does not cause damage to either a magnetic head or a magnetic tape when making transition of the magnetic tape from a stopped state to a running state, when making transition of the magnetic tape from a running state to a stopped state, or when reversing the transportation direction of the magnetic tape, is provided. In a state where any one of a magnetic head and a magnetic tape moves and the other rests (i.e., a state where static friction may occur), such as at the time of starting transportation of the magnetic tape, at the time of stopping the tape in a running state, and at the time of reversing the transportation direction of the magnetic tape, a head displacing portion vibrates the magnetic head under the control by a displacement control portion, and thus no static friction occurs between the magnetic head and the magnetic tape. Therefore, the risk of causing damage to the magnetic head (such as an MR head unit equipped with an MR element) or the magnetic tape can be reduced.

摘要翻译： 一种磁带驱动装置，当使磁带从运行状态转移到停止状态时，在使磁带从停止状态转移到运行状态时不会对磁头或磁带造成损坏 状态，或者当使磁带的运送方向反转时。 在磁头和磁带中的任何一个移动的状态下，另一个位置（即，可能发生静摩擦的状态），例如在开始运送磁带时，在停止时 胶带处于运行状态，并且在反转磁带的传送方向时，磁头位移部分在位移控制部分的控制下使磁头振动，从而在磁头和磁体之间不产生静摩擦 胶带。 因此，可以减少对磁头（例如配备有MR元件的MR头单元）或磁带造成损害的风险。

公开(公告)号：US20080180834A1

公开(公告)日：2008-07-31

申请号：US12021030

申请日：2008-01-28

申请人： Masao FUJITA ,  Kenji TANAKA ,  Seigi KAWARAI

发明人： Masao FUJITA ,  Kenji TANAKA ,  Seigi KAWARAI

IPC分类号： G11B5/584 ,  G11B5/78

CPC分类号： G11B5/584

摘要： The present invention is a servo signal recording method for recording a servo signal on a magnetic tape having a data band and a servo band, wherein erasure is performed based on a pulse having a duty ratio varied so that a driving time of the AC erasing head with respect to one polarity is longer than a driving time thereof with respect to the other polarity, and then, the servo band is magnetized so as to have a magnetization direction opposite to magnetization direction caused by the erasure to record a servo signal in the servo band. According to this configuration, the influence of an information recording signal recorded on the surface of a magnetic recording medium on a reproduction output is reduced, whereby the reproduction output of a servo signal can be enhanced easily.

摘要翻译： 本发明是一种用于在具有数据频带和伺服频带的磁带上记录伺服信号的伺服信号记录方法，其中基于具有改变的占空比的脉冲执行擦除，使得AC擦除头的驱动时间 相对于一个极性相对于其他极性的驱动时间长，然后伺服带被磁化，使得具有与由擦除引起的磁化方向相反的磁化方向在伺服中记录伺服信号 带。 根据该结构，记录在磁记录介质的表面上的信息记录信号对再现输出的影响减小，从而可以容易地提高伺服信号的再现输出。

公开(公告)号：US20090240066A1

公开(公告)日：2009-09-24

申请号：US12429512

申请日：2009-04-24

申请人： Masao FUJITA ,  Yutaka KITAGAWA ,  Makoto MUTO

发明人： Masao FUJITA ,  Yutaka KITAGAWA ,  Makoto MUTO

IPC分类号： C07D207/09

CPC分类号： C07D207/20 ,  C07B2200/07 ,  C07D207/09 ,  C07D207/12 ,  C07D207/16 ,  Y02P20/55

摘要： The present invention provides intermediates needed for production of an optically active compound represented by formula (6), which enable the compound (6) to be readily synthesized in simple production steps without optical resolution, and also provides a process for producing the intermediates.A process for producing an optically active compound represented by formula (4): wherein R1 represents a protecting group for the amino group, or a salt thereof, characterized in that a reagent prepared from an titanium(IV) reagent and an alkylmetal compound is reacted with an optically active compound represented by formula (3): wherein R1 has the same meaning as defined above, if needed, in the presence of a Lewis acid.

摘要翻译： 本发明提供制备由式（6）表示的光学活性化合物所需的中间体，其使得化合物（6）能够在没有光学拆分的情况下以简单的制备步骤容易地合成，并且还提供了制备中间体的方法。 一种制备由式（4）表示的光学活性化合物的方法：其中R1表示氨基的保护基或其盐，其特征在于由钛（IV）试剂和烷基金属化合物制备的试剂反应 与式（3）表示的光学活性化合物：如果需要，在路易斯酸存在下，其中R 1具有与上述相同的含义。