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    • 1. 发明授权
    • Servo signal recording apparatus, servo signal recording method, and magnetic tape
    • 伺服信号记录装置,伺服信号记录方法和磁带
    • US07808736B2
    • 2010-10-05
    • US12019344
    • 2008-01-24
    • Kenji TanakaKenichiro YoshidaMasao FujitaSadamu Kuse
    • Kenji TanakaKenichiro YoshidaMasao FujitaSadamu Kuse
    • G11B5/09G11B21/02G11B5/03
    • G11B5/584G11B5/024
    • A servo signal recording apparatus and servo-signal recording method for recording a servo signal on a magnetic tape that includes a magnetic layer having a data area capable of storing data and a servo area capable of storing a servo signal, the apparatus including a transportation unit for transporting the magnetic tape; a direct current (DC) erasing unit on a downstream side in a magnetic tape transportation direction that performs DC erasure to a surface layer portion of the magnetic layer by magnetization in a longitudinal direction of the magnetic tape; and a servo signal recording unit on a downstream side of the DC erasing unit in the magnetic tape transportation direction, that rubs against the magnetic layer of the magnetic tape, and records a servo signal in the servo area by magnetization in a direction opposite to a direction of the magnetization of the DC erasing unit.
    • 一种用于在包括具有能够存储数据的数据区的磁性层和能够存储伺服信号的伺服区的磁带上记录伺服信号的伺服信号记录装置和伺服信号记录方法,所述装置包括传送单元 用于运送磁带; 在磁带传送方向下游侧的直流(DC)擦除单元,其通过磁带的长度方向的磁化对磁性层的表层部进行直流擦除; 以及伺服信号记录单元,其在磁带传送方向上的直流擦除单元的下游侧,摩擦磁带的磁性层,并且通过磁化沿与磁带的相反方向的磁化将伺服信号记录在伺服区域中 直流擦除单元的磁化方向。
    • 2. 发明申请
    • INFORMATION RECORDING APPARATUS
    • 信息记录装置
    • US20090310251A1
    • 2009-12-17
    • US12479120
    • 2009-06-05
    • Kenji TANAKAKenichiro YoshidaSadamu Kuse
    • Kenji TANAKAKenichiro YoshidaSadamu Kuse
    • G11B5/584
    • G11B5/584
    • The information recording apparatus of the present invention includes N servo heads. Servo signals outputted respectively from the servo heads are delayed by a delay circuit such that the peaks of the waveforms of the servo signals coincide with each other. The delayed servo signals are added up by an adder. Thus, the output level of the servo signal can be increased by N times and the S/N ratio of the servo signal can be also increased by √N times. As a result, the precision of PES improves and the amount of off-track can be reduced. Therefore, even if a magnetic layer in magnetic tape has a small thickness, it is possible to prevent the decline of the output level of the servo signal and the S/N ratio.
    • 本发明的信息记录装置包括N个伺服磁头。 分别从伺服磁头输出的伺服信号由延迟电路延迟使得伺服信号的波形的峰值相互重合。 延迟的伺服信号由加法器相加。 因此,伺服信号的输出电平可以增加N次,并且伺服信号的S / N比也可以增加√N倍。 结果,PES的精度提高,离轨量可以减少。 因此,即使磁带中的磁性层具有小的厚度,也可以防止伺服信号的输出电平和S / N比的下降。
    • 3. 发明授权
    • Information recording apparatus
    • 信息记录装置
    • US07961423B2
    • 2011-06-14
    • US12479120
    • 2009-06-05
    • Kenji TanakaKenichiro YoshidaSadamu Kuse
    • Kenji TanakaKenichiro YoshidaSadamu Kuse
    • G11B5/584
    • G11B5/584
    • The information recording apparatus of the present invention includes N servo heads. Servo signals outputted respectively from the servo heads are delayed by a delay circuit such that the peaks of the waveforms of the servo signals coincide with each other. The delayed servo signals are added up by an adder. Thus, the output level of the servo signal can be increased by N times and the S/N ratio of the servo signal can be also increased by √N times. As a result, the precision of PES improves and the amount of off-track can be reduced. Therefore, even if a magnetic layer in magnetic tape has a small thickness, it is possible to prevent the decline of the output level of the servo signal and the S/N ratio.
    • 本发明的信息记录装置包括N个伺服磁头。 分别从伺服磁头输出的伺服信号由延迟电路延迟使得伺服信号的波形的峰值相互重合。 延迟的伺服信号由加法器相加。 因此,伺服信号的输出电平可以增加N次,并且伺服信号的S / N比也可以增加√N倍。 结果,PES的精度提高,离轨量可以减少。 因此,即使磁带中的磁性层具有小的厚度,也可以防止伺服信号的输出电平和S / N比的下降。
    • 5. 发明申请
    • MAGNETIC TAPE
    • 磁带
    • US20090109566A1
    • 2009-04-30
    • US12193981
    • 2008-08-19
    • Kenji TanakaSadamu KuseKenichiro Yoshida
    • Kenji TanakaSadamu KuseKenichiro Yoshida
    • G11B5/584
    • G11B5/584
    • A magnetic tape of the present invention includes a plurality of data bands in which a data signal can be recorded and servo pattern portions composed of a burst signal. The servo pattern portions are formed at a predetermined interval in a longitudinal direction of the magnetic tape in a plurality of data bands, and positions of the servo pattern portions formed in the respective data bands in the longitudinal direction of the magnetic tape vary. According to such a configuration, a magnetic tape can be provided, which is traced stably by the magnetic head even if the magnetic tape is deformed due to temperature and humidity.
    • 本发明的磁带包括可以记录数据信号的多个数据带和由突发信号组成的伺服图案部分。 伺服图案部分以多个数据带在磁带的纵向方向上以预定的间隔形成,并且形成在磁带的纵向方向上的各个数据带中的伺服图案部分的位置变化。 根据这样的结构,即使磁带由于温度和湿度而变形,也可以设置磁头来稳定地追踪磁头。
    • 6. 发明申请
    • SERVO SIGNAL RECORDING APPARATUS, SERVO SIGNAL RECORDING METHOD, AND MAGNETIC TAPE
    • 伺服信号记录装置,伺服信号记录方法和磁带
    • US20080285171A1
    • 2008-11-20
    • US12019344
    • 2008-01-24
    • Kenji TANAKAKenichiro YoshidaMasao FujitaSadamu Kuse
    • Kenji TANAKAKenichiro YoshidaMasao FujitaSadamu Kuse
    • G11B5/584
    • G11B5/584G11B5/024
    • A servo signal recording apparatus and servo-signal recording method for recording a servo signal on a magnetic tape that includes a magnetic layer having a data area capable of storing data and a servo area capable of storing a servo signal, the apparatus including a transportation unit for transporting the magnetic tape; a DC erasing unit on a downstream side in a magnetic tape transportation direction that performs DC erasure to a surface layer portion of the magnetic layer by magnetization in a longitudinal direction of the magnetic tape; and a servo signal recording unit on a downstream side of the DC erasing unit in the magnetic tape transportation direction, that rubs against the magnetic layer of the magnetic tape, and records a servo signal in the servo area by magnetization in a direction opposite to a direction of the magnetization of the DC erasing unit.
    • 一种用于在包括具有能够存储数据的数据区的磁性层和能够存储伺服信号的伺服区的磁带上记录伺服信号的伺服信号记录装置和伺服信号记录方法,所述装置包括传送单元 用于运送磁带; 在磁带传送方向下游侧的直流擦除单元,通过磁带的长度方向的磁化对磁性层的表层部进行直流擦除; 以及伺服信号记录单元,其在磁带传送方向上的直流擦除单元的下游侧,摩擦磁带的磁性层,并且通过磁化沿与磁带的相反方向的磁化将伺服信号记录在伺服区域中 直流擦除单元的磁化方向。
    • 7. 再颁专利
    • Magnetic recording medium
    • 磁记录介质
    • USRE38048E1
    • 2003-03-25
    • US09109202
    • 1998-07-02
    • Seigi KawaraiKenichiro YoshidaAkira Kato
    • Seigi KawaraiKenichiro YoshidaAkira Kato
    • G11B566
    • G11B5/714G11B5/735Y10S428/90Y10S428/928Y10T428/24355Y10T428/25Y10T428/256Y10T428/257Y10T428/26Y10T428/265
    • There is provided a magnetic recording medium which comprises a substrate, a magnetic layer on one surface of a substrate and a backcoating layer on the other surface of the substrate, wherein the magnetic layer contains a magnetic metal powder having a major axis of not larger than 0.2 &mgr;m and an inorganic powder having a Mohs' hardness of at least 5, and the backcoating layer contains an inorganic powder having a particle size smaller than the size of the major axis of the magnetic metal powder and which has sufficiently reduced noise at high density recording and high output required in, for example, a small size video tape with high picture quality, the magnetic recording medium in the form of a magnetic tape having a total thickness of not larger than 14 &mgr;m inclusive of the substrate, the magnetic layer and the backcoating layer, and reliably maintained not to increase the noise after long term storage.
    • 提供了一种磁记录介质,其包括基板,在基板的一个表面上的磁性层和在基板的另一表面上的背涂层,其中磁性层包含长轴不大于的磁性金属粉末 0.2毫摩尔和莫氏硬度至少为5的无机粉末,背涂层含有粒径小于磁性金属粉末的长轴尺寸的无机粉末,并且具有足够降低的高密度噪声 记录和高输出,例如,具有高图像质量的小尺寸录像带,具有总厚度不大于14μm的磁带形式的磁记录介质,包括基片,磁性层和 背涂层,并且在长期储存后可靠地保持不增加噪声。
    • 8. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US5532042A
    • 1996-07-02
    • US310043
    • 1994-09-22
    • Seigi KawaraiKenichiro YoshidaAkira Kato
    • Seigi KawaraiKenichiro YoshidaAkira Kato
    • G11B5/714G11B5/735B32B3/10B32B5/16G11B5/66
    • G11B5/714G11B5/735Y10S428/90Y10S428/928Y10T428/24355Y10T428/25Y10T428/256Y10T428/257Y10T428/26Y10T428/265
    • There is provided a magnetic recording medium which comprises a substrate, a magnetic layer on one surface of a substrate and a backcoating layer on the other surface of the substrate, wherein the magnetic layer contains a magnetic metal powder having a major axis of not larger than 0.2 .mu.m and an inorganic powder having a Mohs' hardness of at least 5, and the backcoating layer contains an inorganic powder having a particle size smaller than the size of the major axis of the magnetic metal powder and which has sufficiently reduced noise at high density recording and high output required in, for example, a small size video tape with high picture quality, the magnetic recording medium in the form of a magnetic tape having a total thickness of not larger than 14 .mu.m inclusive of the substrate, the magnetic layer and the backcoating layer, and reliably maintained not to increase the noise after long term storage.
    • 提供了一种磁记录介质,其包括基板,在基板的一个表面上的磁性层和在基板的另一表面上的背涂层,其中磁性层包含长轴不大于的磁性金属粉末 0.2μm的莫氏硬度为5以上的无机粉末,背涂层含有粒径小于磁性金属粉末的长轴尺寸的无机粉末,并且在高温下具有充分降低的噪音 在例如具有高图像质量的小尺寸录像带中需要的密度记录和高输出,磁记录介质为整体厚度不大于14μm的磁带,包括基板,磁性 层和背涂层,并且在长期储存后可靠地保持不增加噪声。