公开(公告)号：US07593177B2

公开(公告)日：2009-09-22

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： G11B5/09 ,  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）的逐渐减小的轨道宽度。通过这样的设置，数据磁道的宽度 最靠近伺服磁道（41T-1至41T-5）的A1-41T-1至A1-41T-5等）可以最小化，从而可以显着增加数据磁道的数量。 此外，即使当磁带1的尺寸由于诸如温度或湿度等外部环境的变化而在宽度方向上变化时，为了导致数据磁道的大的位移（A8-41T-1至A8-41T- 5）远离伺服磁道（41T-1至41T-5），数据磁头（A8）可以容易地对准数据磁道（A8-41T-1到A8-41T-5） 数据磁道（A8-41T-1〜A8〜41T-5）的宽度尺寸的增加部分，从而可以确保从数据磁道读取数据信号（A8〜41T-1〜A8〜41T- 5），以提高再现精度。

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：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：US07545597B2

公开(公告)日：2009-06-09

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

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）的逐渐减小的轨道宽度。通过这样的设置，数据磁道的宽度 最靠近伺服磁道（41T-1至41T-5）的A1-41T-1至A1-41T-5等）可以最小化，从而可以显着增加数据磁道的数量。 此外，即使当磁带1的尺寸由于诸如温度或湿度等外部环境的变化而在宽度方向上变化时，为了导致数据磁道的大的位移（A8-41T-1至A8-41T- 5）远离伺服磁道（41T-1至41T-5），数据磁头（A8）可以容易地对准数据磁道（A8-41T-1到A8-41T-5） 数据磁道（A8-41T-1〜A8〜41T-5）的宽度尺寸的增加部分，从而可以确保从数据磁道读取数据信号（A8〜41T-1〜A8〜41T- 5），以提高再现精度。

公开(公告)号：US20070086109A1

公开(公告)日：2007-04-19

申请号：US11562756

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

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：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。

公开(公告)号：US07253988B2

公开(公告)日：2007-08-07

申请号：US11562756

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

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.

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：US20080107921A1

公开(公告)日：2008-05-08

申请号：US11766491

申请日：2007-06-21

申请人： Sadamu Kuse ,  Tsugihiro Doi ,  Tetsutaro Inoue ,  Mikio Kishimoto ,  Yuji Sasaki ,  Hideaki Watanabe

发明人： Sadamu Kuse ,  Tsugihiro Doi ,  Tetsutaro Inoue ,  Mikio Kishimoto ,  Yuji Sasaki ,  Hideaki Watanabe

IPC分类号： G11B5/39 ,  G11B5/62

CPC分类号： B82Y25/00 ,  G11B5/584 ,  G11B5/70 ,  G11B5/70615 ,  G11B5/70621 ,  G11B5/712 ,  G11B5/714 ,  G11B5/716 ,  G11B5/73 ,  G11B5/735 ,  G11B5/78 ,  G11B23/107 ,  H01F1/0054 ,  H01F1/0551 ,  H01F1/059 ,  Y10T428/1107 ,  Y10T428/2991

摘要： A magnetic recording medium comprising a non-magnetic support; at least one lower magnetic layer containing magnetic powder and a binder resin, which is formed on one side of the non-magnetic support with or without a non-magnetic primer layer interposed between the non-magnetic support and the lower magnetic layer; at least one non-magnetic intermediate layer containing non-magnetic powder and a binder resin, which is formed on the lower magnetic layer; at least one upper magnetic layer containing magnetic powder and a binder resin, which is formed on the non-magnetic intermediate layer; and a back layer which is formed on the other side of the non-magnetic support, characterized in that the magnetic powder contained in the uppermost magnetic layer of the upper magnetic layer is iron type magnetic powder which comprises substantially spherical or ellipsoidal particles with a number-average particle diameter of 5 to 50 nm and an average axial ratio of 1 to 2, each of said particles containing iron or containing iron as a main component and a transition element; and that the total thickness of the magnetic recording medium is 6 μm or less. This magnetic recording medium has electromagnetic conversion, characteristics which cannot be achieved by any of conventional magnetic recording media, and also is expected to have excellent magnetic serve characteristics.

摘要翻译： 一种磁记录介质，包括非磁性载体; 至少一个含有磁性粉末和粘合剂树脂的下磁性层，其形成在非磁性载体的一侧上，该非磁性载体具有或不具有介于非磁性载体和下部磁性层之间的非磁性底漆层; 至少一个含有非磁性粉末和粘结剂树脂的非磁性中间层，形成在下部磁性层上; 至少一个含有磁性粉末和粘结剂树脂的上磁性层，形成在非磁性中间层上; 以及形成在所述非磁性载体的另一侧的背层，其特征在于，包含在所述上磁性层的最上层磁性层中的磁性粉末是铁型磁粉，其包含基本上具有数量的球形或椭圆形颗粒 平均粒径为5〜50nm，平均轴比为1〜2，所述粒子含有铁或以铁为主要成分，过渡元素为主成分。 并且磁记录介质的总厚度为6μm或更小。 这种磁记录介质具有电磁转换特性，这些特性通过任何常规的磁记录介质都不能实现，并且预期具有优异的磁性能特性。