公开(公告)号：US5252380A

公开(公告)日：1993-10-12

申请号：US825402

申请日：1992-01-24

申请人： Tetuya Nakazumi ,  Mikio Kishimoto ,  Toshinobu Sueyoshi ,  Seigi Kawarai

发明人： Tetuya Nakazumi ,  Mikio Kishimoto ,  Toshinobu Sueyoshi ,  Seigi Kawarai

IPC分类号： C22C33/02 ,  G11B5/706 ,  G11B5/714 ,  G11B5/00

CPC分类号： G11B5/714 ,  C22C33/0285 ,  G11B5/70621 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/25 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/265 ,  Y10T428/2991

摘要： An acicular alloy base magnetic powder comprising iron and cobalt, which has an average particle long axis size of not larger than 0.25 .mu.m, an axial ratio of from 4 to 8, a cobalt content of from 8 to 50% by weight based on the weight of iron and saturation magnetization of at least 120 emu/g after being kept standing at the temperature of 60.degree. C. and relative humidity of 90% for a week, which has improved corrosion resistance and can provide a magnetic recording medium suitable for recording in the short wavelength range.

摘要翻译： 包含铁和钴的针状合金基磁性粉末，其平均粒子长轴尺寸不大于0.25μm，轴向比为4至8，钴含量为8至50重量％，基于 在60℃的温度和90％的相对湿度下保持静置一周之后，铁和饱和磁化强度至少为120emu / g，这具有改善的耐腐蚀性，并且可以提供适合于记录的磁记录介质 在短波长范围内。

公开(公告)号：US5260132A

公开(公告)日：1993-11-09

申请号：US701059

申请日：1991-05-16

申请人： Tetuya Nakazumi ,  Mikio Kishimoto ,  Toshinobu Sueyoshi ,  Seigi Kawarai

发明人： Tetuya Nakazumi ,  Mikio Kishimoto ,  Toshinobu Sueyoshi ,  Seigi Kawarai

IPC分类号： B32B1/00 ,  G11B5/00

CPC分类号： B32B1/00 ,  G11B5/00 ,  Y10S428/90 ,  Y10T428/2991

摘要： An acicular alloy base magnetic powder comprising iron and cobalt, which has an average particle long axis size of not larger than 0.25 .mu.m, an axial ratio of from 4 to 8, a cobalt content of from 8 to 50% by weight based on the weight of iron and saturation magnetization of at least 120 emu/g after being kept standing at the temperature of 60.degree. C. and relative humidity of 90% for a week, which has improved corrosion resistance and can provide a magnetic recording medium suitable for recording in the short wavelength range.

摘要翻译： 包含铁和钴的针状合金基磁性粉末，其平均粒子长轴尺寸不大于0.25μm，轴向比为4至8，钴含量为8至50重量％，基于 在60℃的温度和90％的相对湿度下保持静置一周之后，铁和饱和磁化强度至少为120emu / g，这具有改善的耐腐蚀性，并且可以提供适合于记录的磁记录介质 在短波长范围内。

公开(公告)号：US4956220A

公开(公告)日：1990-09-11

申请号：US28570

申请日：1987-03-20

申请人： Toshinobu Sueyoshi ,  Seiichi Asada ,  Masahiro Amemiya ,  Seigi Kawarai ,  Akira Miyake

发明人： Toshinobu Sueyoshi ,  Seiichi Asada ,  Masahiro Amemiya ,  Seigi Kawarai ,  Akira Miyake

IPC分类号： G11B5/706 ,  G11B5/712

CPC分类号： G11B5/70615 ,  G11B5/712 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/2991 ,  Y10T428/2993

摘要： A magnetic recording medium with improved output characteristics and durability is provided by using magnetic powder comprising iron-containing particles each of which carries a compound containing aluminum and/or a compound containing silicon in such amounts that, in the whole magnetic powder, a weight ratio of silicon to iron is from 0.010:1 to 0.150:1, a weight ratio of aluminum to iron is from 0.040:1 to 0.150:1, and a weight ratio of aluminum to silicon is from 1:1 to 15:1.

摘要翻译： 通过使用包含含铁颗粒的磁性粉末提供具有改善的输出特性和耐久性的磁记录介质，每个含铁颗粒携带含有铝和/或含硅化合物的化合物，其量在整个磁粉中的重量比 的硅与铁的重量比为0.010:1至0.150:1，铝与铁的重量比为0.040:1至0.150:1，铝与硅的重量比为1:1至15:1。

公开(公告)号：US07701655B2

公开(公告)日：2010-04-20

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： G11B5/09 ,  G11B5/584

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：US20050254162A1

公开(公告)日：2005-11-17

申请号：US11129400

申请日：2005-05-16

申请人： Masao Okafuji ,  Tsugihiro Doi ,  Tetsutaro Inoue ,  Hiroyuki Mitsuhashi ,  Seigi Kawarai ,  Sadamu Kuse

发明人： Masao Okafuji ,  Tsugihiro Doi ,  Tetsutaro Inoue ,  Hiroyuki Mitsuhashi ,  Seigi Kawarai ,  Sadamu Kuse

IPC分类号： G11B5/584 ,  G11B5/09 ,  G11B5/29

CPC分类号： G11B5/584 ,  G11B5/00813 ,  G11B5/00878

摘要： In a recording/reproducing method of a magnetic tape in a tracking servo system, a recording density of each data track is increased while inhibiting occurrence of a recording/reproducing error caused by a size change of a magnetic tape in the width direction. Data tracks are each set to have a smaller track width stepwise as closer to servo tracks (41T-1 to 41T-5 etc.) in the width direction of a magnetic tape 1. With such a setting, the width of the data tracks (A1-41T-1 to A1-41T-5 etc.) closest to the servo tracks (41T-1 to 41T-5) can be minimized, thereby enabling a significant increase in number of the data tracks. Further, even when the size of the magnetic tape 1 changes in the width direction due to a change in external environment such as a temperature or moisture, to lead to large displacement of the data tracks (A8-41T-1 to A8-41T-5) distant from the servo tracks (41T-1 to 41T-5), the data head (A8) can be readily aligned to face the data tracks (A8-41T-1 to A8-41T-5) in the reproduction by an increased portion of the width size of the data tracks (A8-41T-1 to A8-41T-5), and it is thereby possible to ensure reading of data signals from the data tracks (A8-41T-1 to A8-41T-5) so as to improve reproduction accuracy.

摘要翻译： 在跟踪伺服系统中的磁带的记录/再现方法中，增加每个数据磁道的记录密度，同时抑制由磁带在宽度方向上的尺寸变化引起的记录/再现错误的发生。 数据磁道各自被设置为具有比磁带1的宽度方向更靠近伺服磁道（41T-1至41T-5等）的逐渐减小的磁迹宽度。 通过这样的设定，可以使最靠近伺服轨道（41T-1〜41T-5）的数据轨迹（A 1〜41 T 1〜A 1〜41 T 5等）的宽度最小化， 从而能够显着增加数据轨道的数量。 此外，即使由于外部环境（如温度或水分）的变化而导致磁带1的宽度方向的变化，导致数据磁道的大的位移（A 8〜41 T 1〜A 8 - 41 T-5），数据头（A 8）可以容易地对准数据磁道（A 8 - 41 T 1到A 8） - 41 T-5）在数据轨道（A 8 - 41 T 1至A 8 - 41 T-5）的宽度大小的增加部分的再现中，从而可以确保读取数据信号 从数据轨道（A 8 - 41 T 1到A 8 - 41 T-5），以提高再现精度。

公开(公告)号：US20050170214A1

公开(公告)日：2005-08-04

申请号：US10995314

申请日：2004-11-24

申请人： Tsugihiro Doi ,  Tetsutaro Inoue ,  Hisanobu Mikamo ,  Seigi Kawarai ,  Sadamu Kuse

发明人： Tsugihiro Doi ,  Tetsutaro Inoue ,  Hisanobu Mikamo ,  Seigi Kawarai ,  Sadamu Kuse

IPC分类号： G11B5/72 ,  G11B5/84 ,  G11B5/68

CPC分类号： G11B5/8408 ,  G11B5/72

摘要： There is provided a magnetic recording medium comprising a flexible non-magnetic substrate, and a magnetic layer containing magnetic particles, formed on at least one surface of the flexible non-magnetic substrate, and this magnetic recording medium is characterized in that an uppermost layer formed on the side of the magnetic layer is a non-magnetic layer with a thickness of 1 to 50 nm, which contains a resin and has a surface roughness (P-V) of 2 to 20 nm. This magnetic recording medium is excellent in high density recording performance, and is highly reliable in durability.

摘要翻译： 提供了一种磁性记录介质，其包括柔性非磁性基板和形成在柔性非磁性基板的至少一个表面上的含有磁性颗粒的磁性层，该磁性记录介质的特征在于形成了最上层 在磁性层的一侧是厚度为1〜50nm的非磁性层，其含有树脂，表面粗糙度（PV）为2〜20nm。 该磁记录介质具有优异的高密度记录性能，并且耐久性高度可靠。

公开(公告)号：US5725943A

公开(公告)日：1998-03-10

申请号：US222341

申请日：1994-04-04

申请人： Junichi Hirata ,  Sadamu Kuse ,  Seigi Kawarai

发明人： Junichi Hirata ,  Sadamu Kuse ,  Seigi Kawarai

IPC分类号： G11B5/78 ,  C08J5/18 ,  C09D5/23 ,  G11B5/62 ,  G11B5/73 ,  G11B5/735 ,  G11B23/04 ,  G11B23/087 ,  G11B5/704

CPC分类号： C08J5/18 ,  G11B23/04 ,  G11B5/62 ,  G11B5/7305 ,  G11B5/735 ,  C08J2367/02 ,  Y10S428/90 ,  Y10T428/31786

摘要： A magnetic tape cartridge comprising a magnetic tape suitable for long time recording which has a coefficient of thermal shrinkage of 0.6% or less the coefficient being measured after the tape is wound around a hub at least 300 turns and kept at 105.degree. C. for 30 minutes.

摘要翻译： 一种磁带盒，包括适于长时间记录的磁带，该磁带的热收缩系数在磁带缠绕在轮毂上之后测量的系数为0.6％或更小，并且在105℃下保持30秒 分钟。

公开(公告)号：US20070097541A1

公开(公告)日：2007-05-03

申请号：US11562745

申请日：2006-11-22

申请人： Masao OKAFUJI ,  Tsugihiro Doi ,  Tetsutaro Inoue ,  Hiroyuki Mitsuhashi ,  Seigi Kawarai ,  Sadamu Kuse

发明人： Masao OKAFUJI ,  Tsugihiro Doi ,  Tetsutaro Inoue ,  Hiroyuki Mitsuhashi ,  Seigi Kawarai ,  Sadamu Kuse

IPC分类号： G11B5/584 ,  G11B5/09

CPC分类号： G11B5/584 ,  G11B5/00813 ,  G11B5/00878

摘要： In a recording/reproducing method of a magnetic tape in a tracking servo system, a recording density of each data track is increased while inhibiting occurrence of a recording/reproducing error caused by a size change of a magnetic tape in the width direction. Data tracks are each set to have a smaller track width stepwise as closer to servo tracks (41T-1 to 41T-5 etc.) in the width direction of a magnetic tape 1. With such a setting, the width of the data tracks (A1-41T-1 to A1-41T-5 etc. ) closest to the servo tracks (41T-1 to 41T-5) can be minimized, thereby enabling a significant increase in number of the data tracks. Further, even when the size of the magnetic tape 1 changes in the width direction due to a change in external environment such as a temperature or moisture, to lead to large displacement of the data tracks (A8-41T-1 to A8-41T-5) distant from the servo tracks (41T-1 to 41T-5), the data head (A8) can be readily aligned to face the data tracks (A8-41T-1 to A8-41T-5) in the reproduction by an increased portion of the width size of the data tracks (A8-41T-1 to A8-41T-5), and it is thereby possible to ensure reading of data signals from the data tracks (A8-41T-1 to A8-41T-5) so as to improve reproduction accuracy.

摘要翻译： 在跟踪伺服系统中的磁带的记录/再现方法中，增加每个数据磁道的记录密度，同时抑制由磁带在宽度方向上的尺寸变化引起的记录/再现错误的发生。 数据磁道各自被设置为在磁带1的宽度方向上具有更靠近伺服磁道（41T-1至41T-5等）的逐渐减小的磁道宽度。通过这样的设置，数据的宽度 最靠近伺服轨道（41 T 1至41 T-5）的轨道（A 1 - 41 T 1至A 1 - 41 T 5等）可以最小化，从而可以显着增加数据量 轨道 此外，即使由于外部环境（如温度或水分）的变化而导致磁带1的宽度方向的变化，导致数据磁道的大的位移（A 8〜41 T 1〜A 8 - 41 T-5），数据头（A 8）可以容易地对准数据磁道（A 8 - 41 T 1到A 8） - 41 T-5）在数据轨道（A 8 - 41 T 1至A 8 - 41 T-5）的宽度大小的增加部分的再现中，从而可以确保读取数据信号 从数据轨道（A 8 - 41 T 1到A 8 - 41 T-5），以提高再现精度。

公开(公告)号：US07170709B2

公开(公告)日：2007-01-30

申请号：US11129400

申请日：2005-05-16

申请人： Masao Okafuji ,  Tsugihiro Doi ,  Tetsutaro Inoue ,  Hiroyuki Mitsuhashi ,  Seigi Kawarai ,  Sadamu Kuse

发明人： Masao Okafuji ,  Tsugihiro Doi ,  Tetsutaro Inoue ,  Hiroyuki Mitsuhashi ,  Seigi Kawarai ,  Sadamu Kuse

IPC分类号： G11B5/584 ,  G11B5/09

CPC分类号： G11B5/584 ,  G11B5/00813 ,  G11B5/00878

摘要： In a recording/reproducing method of a magnetic tape in a tracking servo system, a recording density of each data track is increased while inhibiting occurrence of a recording/reproducing error caused by a size change of a magnetic tape in the width direction. Data tracks are each set to have a smaller track width stepwise as closer to servo tracks (41T-1 to 41T-5 etc.) in the width direction of a magnetic tape 1. With such a setting, the width of the data tracks (A1-41T-1 to A1-41T-5 etc.) closest to the servo tracks (41T-1 to 41T-5) can be minimized, thereby enabling a significant increase in number of the data tracks. Further, even when the size of the magnetic tape 1 changes in the width direction due to a change in external environment such as a temperature or moisture, to lead to large displacement of the data tracks (A8-41T-1 to A8-41T-5) distant from the servo tracks (41T-1 to 41T-5), the data head (A8) can be readily aligned to face the data tracks (A8-41T-1 to A8-41T-5) in the reproduction by an increased portion of the width size of the data tracks (A8-41T-1 to A8-41T-5), and it is thereby possible to ensure reading of data signals from the data tracks (A8-41T-1 to A8-41T-5) so as to improve reproduction accuracy.

摘要翻译： 在跟踪伺服系统中的磁带的记录/再现方法中，增加每个数据磁道的记录密度，同时抑制由磁带在宽度方向上的尺寸变化引起的记录/再现错误的发生。 数据磁道各自被设置为具有比磁带1的宽度方向更靠近伺服磁道（41T-1至41T-5等）的逐渐减小的磁迹宽度。 通过这样的设定，可以使最靠近伺服轨道（41T-1〜41T-5）的数据轨道（A 1〜41 T 1〜A 1〜41 T 5等）的宽度最小化， 从而能够显着增加数据轨道的数量。 此外，即使由于外部环境（如温度或水分）的变化而导致磁带1的宽度方向的变化，导致数据磁道的大的位移（A 8〜41 T 1〜A 8 - 41 T-5），数据头（A 8）可以容易地对准数据磁道（A 8 - 41 T 1到A 8） - 41 T-5）在数据轨道（A 8 - 41 T 1至A 8 - 41 T-5）的宽度大小的增加部分的再现中，从而可以确保读取数据信号 从数据轨道（A 8 - 41 T 1到A 8 - 41 T-5），以提高再现精度。

公开(公告)号：US20070285832A1

公开(公告)日：2007-12-13

申请号：US11771615

申请日：2007-06-29

申请人： Masao Okafuji ,  Tsugihiro Doi ,  Tetsutaro Inoue ,  Hiroyuki Mitsuhashi ,  Seigi Kawarai ,  Sadamu Kuse

发明人： Masao Okafuji ,  Tsugihiro Doi ,  Tetsutaro Inoue ,  Hiroyuki Mitsuhashi ,  Seigi Kawarai ,  Sadamu Kuse

IPC分类号： G11B5/584

CPC分类号： G11B5/584 ,  G11B5/00813 ,  G11B5/00878

摘要： In a recording/reproducing method of a magnetic tape in a tracking servo system, a recording density of each data track is increased while inhibiting occurrence of a recording/reproducing error caused by a size change of a magnetic tape in the width direction. Data tracks are each set to have a smaller track width stepwise as closer to servo tracks (41T-1 to 41T-5 etc.) in the width direction of a magnetic tape 1. With such a setting, the width of the data tracks (A1-41T-1 to A1-41T-5 etc.) closest to the servo tracks (41T-1 to 41T-5) can be minimized, thereby enabling a significant increase in number of the data tracks. Further, even when the size of the magnetic tape 1 changes in the width direction due to a change in external environment such as a temperature or moisture, to lead to large displacement of the data tracks (A8-41T-1 to A8-41T-5) distant from the servo tracks (41T-1 to 41T-5), the data head (A8) can be readily aligned to face the data tracks (A8-41T-1 to A8-41T-5) in the reproduction by an increased portion of the width size of the data tracks (A8-41T-1 to A8-41T-5), and it is thereby possible to ensure reading of data signals from the data tracks (A8-41T-1 to A8-41T-5) so as to improve reproduction accuracy.

摘要翻译： 在跟踪伺服系统中的磁带的记录/再现方法中，增加每个数据磁道的记录密度，同时抑制由磁带在宽度方向上的尺寸变化引起的记录/再现错误的发生。 数据磁道各自被设置为具有比磁带1的宽度方向更靠近伺服磁道（41T-1至41T-5等）的逐渐减小的磁迹宽度。 通过这样的设定，可以使最靠近伺服轨道（41T-1〜41T-5）的数据轨道（A 1〜41 T 1〜A 1〜41 T 5等）的宽度最小化， 从而能够显着增加数据轨道的数量。 此外，即使由于外部环境（如温度或水分）的变化而导致磁带1的宽度方向的变化，导致数据磁道的大的位移（A 8〜41 T 1〜A 8 - 41 T-5），数据头（A 8）可以容易地对准数据磁道（A 8 - 41 T 1到A 8） - 41 T-5）在数据轨道（A 8 - 41 T 1至A 8 - 41 T-5）的宽度大小的增加部分的再现中，从而可以确保读取数据信号 从数据轨道（A 8 - 41 T 1到A 8 - 41 T-5），以提高再现精度。