公开(公告)号：US06221519B1

公开(公告)日：2001-04-24

申请号：US09272622

申请日：1999-03-19

申请人： Takanori Doi ,  Kousaku Tamari ,  Yasuo Kakihara ,  Kenichi Nakata ,  Mitsuru Matsuura ,  Setsuo Yamamoto

发明人： Takanori Doi ,  Kousaku Tamari ,  Yasuo Kakihara ,  Kenichi Nakata ,  Mitsuru Matsuura ,  Setsuo Yamamoto

IPC分类号： G11B566

CPC分类号： G11B5/7325 ,  G11B5/656 ,  G11B5/84 ,  G11B5/8404 ,  Y10S428/90

摘要： A magnetic recording medium comprising: a plastic substrate; a nickel oxide underlayer formed on said substrate; and a cobalt-containing maghemite thin film formed on said nickel oxide underlayer, containing cobalt at a molar ratio of cobalt to iron of 0.01:1 to 0.1:1, and having either a spacing of a plane (311) of not more than 2.510 Å, a spacing of a plane (222) of not more than 2.415 Å or a spacing of a plane (220) of not more than 2.950 Å, a ratio value of an X-ray diffraction pattern peak intensity of either of the planes (311), (222) and (220) of said cobalt-containing maghemite thin film to an X-ray diffraction pattern peak intensity of the plane (400) thereof being more than 0.5. Such magnetic recording medium suitably applicable to existent magnetic recording systems using a ring-type magnetic head and capable of using a plastic substrate for providing a magnetic recording medium for high-density recording.

摘要翻译： 一种磁记录介质，包括：塑料基板;形成在所述基板上的氧化镍底层; 和在所述氧化镍底层上形成的含钴的磁赤铁矿薄膜，其含有钴与铁的摩尔比为0.01:1至0.1:1的钴，并且具有不大于2.510的平面（311）的间隔 ，平面（222）的间距不大于2.415或平面（220）的间距不大于2.950，任一平面（311）的X射线衍射图峰值强度的比值 ），所述含钴磁赤铁矿薄膜的（222）和（220）相对于所述平面（400）的X射线衍射图峰值强度大于0.5。 这种磁记录介质适用于使用环形磁头的现有磁记录系统，并能够使用塑料基板提供用于高密度记录的磁记录介质。

公开(公告)号：US6159594A

公开(公告)日：2000-12-12

申请号：US161988

申请日：1998-09-29

申请人： Kousaku Tamari ,  Takanori Doi ,  Yasuo Kakihara ,  Kenichi Nakata

发明人： Kousaku Tamari ,  Takanori Doi ,  Yasuo Kakihara ,  Kenichi Nakata

IPC分类号： G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/73 ,  G11B5/738 ,  H01F10/16

CPC分类号： G11B5/7325 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

摘要： A magnetic recording medium of the present invention comprises:a substrate;a nickel oxide underlayer formed on said substrate; anda cobalt-containing maghemite thin film formed on said nickel oxide underlayer, having either a spacing of a (311) plane of not more than 2.510 .ANG., a spacing of a (222) plane of not more than 2.415 .ANG. or a spacing of a (220) plane of not more than 2.950 .ANG., and having the ratio of either of X-ray diffraction spectrum peak intensities of the (311), (222) or (220) planes of said cobalt-containing maghemite thin film to an X-ray diffraction spectrum peak intensity of the (400) plane of more than 0.5:1.Such a magnetic recording medium has a higher coercive force, a higher saturation magnetization, less amount of noise generated, a large output in a high recording frequency region and less distortion of a reproduced waveform, and is suitable for use in current magnetic recording systems in which a ring-type magnetic write head is used.

摘要翻译： 本发明的磁记录介质包括：基板; 形成在所述基板上的氧化镍底层; 以及形成在所述氧化镍底层上的含有钴的磁赤铁矿薄膜，其间隔为（311）面不大于2.510安培，（222）面间距不大于2.415安培或间距 （220）面不超过2.950，并且所述含钴磁赤铁矿薄膜的（311），（222）或（220）面的X射线衍射光谱峰值强度与 （400）面的X射线衍射谱峰强度大于0.5：1。 这种磁记录介质具有较高的矫顽力，较高的饱和磁化强度，较少的噪声产生量，高记录频率区域的输出较大，再生波形失真较少，适用于目前的磁记录系统 使用环形磁性写入头。

公开(公告)号：US06268024B1

公开(公告)日：2001-07-31

申请号：US09276520

申请日：1999-03-25

申请人： Takanori Doi ,  Kousaku Tamari ,  Yasuo Kakihara ,  Kenichi Nakata ,  Mitsuru Matsuura ,  Setsuo Yamamoto

发明人： Takanori Doi ,  Kousaku Tamari ,  Yasuo Kakihara ,  Kenichi Nakata ,  Mitsuru Matsuura ,  Setsuo Yamamoto

IPC分类号： H05H100

CPC分类号： G11B5/7325 ,  G11B5/656 ,  G11B5/84 ,  G11B5/8404

摘要： A magnetic recording medium is prepared by forming on a plastic substrate, a nickel oxide underlayer having a plane (200) which is predominantly oriented in parallel with the surface of the plastic substrate, then forming on the nickel oxide underlayer at a substrate temperature of less 240° C., a cobalt-containing magnetite thin film having a plane (400) which is predominantly oriented in parallel with the surface of the plastic substrate, and finally oxidizing the cobalt-containing magnetite thin film in a plasma-activated oxygen atmosphere containing a rare gas at a substrate temperature of less than 240° C. while incorporating the rare gas into oxygen. This results in a cobalt-containing maghemite thin film as a perpendicular magnetic film having a spacing of a plane (400) of not more than 2.082 Å. The magnetic recording medium so produced is useful for high-density recording using a plastic substrate.

摘要翻译： 通过在塑料基板上形成氧化镍底层制备磁记录介质，所述氧化镍底层具有主要与塑料基板的表面平行取向的平面（200），然后在较低的基板温度下在氧化镍底层上形成 240℃的含钴磁铁矿薄膜，其具有主要与塑料基板的表面平行取向的平面（400），最后在等离子体激活的氧气氛中氧化含钴磁铁矿薄膜，其中含有 在低于240℃的衬底温度下的稀有气体，同时将稀有气体并入氧气中。 这导致含有钴的磁赤铁矿薄膜作为垂直磁性膜，其平面（400）的间隔不大于2.082。 所制造的磁记录介质对于使用塑料基板的高密度记录是有用的。

公开(公告)号：US06187462B1

公开(公告)日：2001-02-13

申请号：US09272618

申请日：1999-03-19

申请人： Takanori Doi ,  Kousaku Tamari ,  Yasuo Kakihara ,  Kenichi Nakata ,  Mitsuru Matsuura ,  Setsuo Yamamoto

发明人： Takanori Doi ,  Kousaku Tamari ,  Yasuo Kakihara ,  Kenichi Nakata ,  Mitsuru Matsuura ,  Setsuo Yamamoto

IPC分类号： G11B566

CPC分类号： G11B5/656 ,  G11B5/84 ,  G11B5/851 ,  Y10S428/90

摘要： A magnetic recording medium of the present invention comprises: a plastic substrate; and a cobalt-containing maghemite thin film formed on said substrate, containing cobalt at a molar ratio of cobalt to iron of not more than 0.06:1, and having either a spacing of a plane (311) of not more than 2.510 Å, a spacing of a plane (222) of not more than 2.415 Å or a spacing of a plane (220) of not more than 2.950 Å; and has a coercive force of not less than 2,000 Oe. Such magnetic recording medium suitably applicable to existent magnetic recording systems using a ring-type magnetic head and capable of using a plastic substrate for providing a magnetic recording medium for high-density recording.

摘要翻译： 本发明的磁记录介质包括：塑料基板; 以及在所述基板上形成的含有钴与铁的摩尔比为0.06：1以下且具有不大于2.51的平面（311）间隔的钴的磁赤铁矿薄膜， 平面（222）的间距不大于2.415埃或平面（220）的间距不大于2.950埃; 并具有不低于2000 Oe的矫顽力。 这种磁记录介质适用于使用环形磁头的现有磁记录系统，并能够使用塑料基板提供用于高密度记录的磁记录介质。

公开(公告)号：US6165608A

公开(公告)日：2000-12-26

申请号：US161999

申请日：1998-09-29

申请人： Kousaku Tamari ,  Takanori Doi ,  Yasuo Kakihara ,  Kenichi Nakata

发明人： Kousaku Tamari ,  Takanori Doi ,  Yasuo Kakihara ,  Kenichi Nakata

IPC分类号： G11B5/66 ,  G11B5/64 ,  G11B5/65 ,  G11B5/851 ,  H01F10/16

CPC分类号： G11B5/656 ,  G11B5/851 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

摘要： A magnetic recording medium of the present invention comprises:a substrate; anda cobalt-containing maghemite thin film formed on said substrate, containing cobalt at a molar ratio of cobalt to iron of not more than 0.06:1, having either a spacing of a (311) plane of not more than 2.510 .ANG., a spacing of a (222) plane of not more than 2.415 .ANG. or a spacing of a (220) plane of not more than 2.950 .ANG., and having a coercive force of not less than 1,800 Oe.Such a magnetic recording medium has as high a coercive force as possible, specifically not less than 1,800 Oe, and exhibits an excellent stability independent to change in passage of time and a large output in a high recording frequency region.

摘要翻译： 本发明的磁记录介质包括：基板; 和在所述基板上形成的含钴磁赤铁矿薄膜，其含有钴与铁的摩尔比不大于0.06:1的钴，其间隔（311）面不大于2.510安培，间距 （222）平面的不大于2.415安培的平面或（220）平面间距不大于2.950安培，并具有不小于1,800 Oe的矫顽力。 这样的磁记录介质具有尽可能高的矫顽力，特别是不低于1,800Oe，并且表现出与在高记录频率区域中随时间变化和大输出无关的优异的稳定性。

公开(公告)号：US06821618B2

公开(公告)日：2004-11-23

申请号：US10185728

申请日：2002-07-01

申请人： Jun Koujima ,  Teruaki Santoki ,  Kenichi Nakata ,  Takanori Doi ,  Masaaki Maekawa ,  Kousaku Tamari

发明人： Jun Koujima ,  Teruaki Santoki ,  Kenichi Nakata ,  Takanori Doi ,  Masaaki Maekawa ,  Kousaku Tamari

IPC分类号： C23C1408

CPC分类号： G11B5/653 ,  G11B5/851 ,  Y10T428/265

摘要： A magnetic recording medium exhibiting a high coercive force and excellent squareness having a substrate, an underlayer formed on the substrate, and a spinel-type iron oxide thin film with maghemite as a main component formed on the underlayer. The spinel-type iron oxide thin film has a thickness (t) of 5 to 50 nm, is constituted by grains having an average grain size (D) of 5 to 30 nm, standard deviation of sizes of grain of not more than 4 nm and a ratio (D/t) of the average grain size (D) to the thickness (t) of less than 1.0, exhibits a coercive force of not less than 159 kA/m (2,000 Oe) and a coercive squareness ratio S* of not less than 0.5:1 in a longitudinal recording medium or a squareness ratio not less than 0.75:1 in a perpendicular recording medium.

摘要翻译： 具有高矫顽力和具有基底的优良矩形性的磁记录介质，在基底上形成的底层和在底层上形成有以磁赤铁矿为主要成分的尖晶石型氧化铁薄膜。 尖晶石型氧化铁薄膜的厚度（t）为5〜50nm，由平均粒径（D）为5〜30nm的晶粒构成，粒径不超过4nm的标准偏差 平均粒径（D）与厚度（t）的比（D / t）小于1.0时，矫顽力为159kA / m 2（2000Oe），矫顽截面比S * 在纵向记录介质中不小于0.5:1，或垂直记录介质中不小于0.75:1的矩形比。

公开(公告)号：US06753077B2

公开(公告)日：2004-06-22

申请号：US09741890

申请日：2000-12-22

申请人： Kenichi Nakata ,  Kousaku Tamari ,  Jun Koujima ,  Teruaki Santoki

发明人： Kenichi Nakata ,  Kousaku Tamari ,  Jun Koujima ,  Teruaki Santoki

IPC分类号： G11B562

CPC分类号： G11B5/653 ,  G11B5/64 ,  G11B5/656 ,  G11B5/84 ,  G11B5/851 ,  Y10T428/265

摘要： A magnetic recording medium including a substrate and formed on the substrate a maghemite thin film having a surface roughness represented by a center line mean roughness Ra of 0.1 to 1.0 nm, and a coercive force squareness S* value of not less than 0.50. This magnetic recording medium exhibits excellent magnetic properties, especially, coercive force squareness S* value and a more enhanced surface smoothness.

摘要翻译： 一种包括基板的磁记录介质，在基板上形成具有中心线平均粗糙度Ra为0.1〜1.0nm，矫顽力矩S *值为0.50以上的表面粗糙度的磁赤铁矿薄膜。 该磁记录介质表现出优异的磁特性，特别是矫顽力矩S *值和更强的表面平滑度。

公开(公告)号：US20150131350A1

公开(公告)日：2015-05-14

申请号：US14394875

申请日：2012-04-18

申请人： Takuya ISOMURA ,  Takashi HAMATANI ,  Kenichi NAKATA ,  Kazuya MATSUME ,  TOYOTA JIDOSHA KABUSHIKI KAISHA

发明人： Takuya Isomura ,  Takashi Hamatani ,  Kenichi Nakata ,  Kazuya Matsumi

IPC分类号： H02M1/38 ,  H02M7/537

CPC分类号： H02M1/38 ,  H02M7/537 ,  H02M7/538 ,  H03K17/08128 ,  H03K17/168

摘要： This description relates to an electrical power converter including a series connection of two transistors, and provides a technology for suppressing increase in electrical current flowing through the transistors when the two transistors are turned on at the same time for some defective reason. An electrical power converter disclosed herein includes a series connection of a first transistor and a second transistor. The electrical power converter includes a clamp circuit configured to inhibit an abnormal rise in gate voltage, which is provided in at least either the first transistor or the second transistor. The clamp circuit includes a diode and a capacitor. The diode has an anode connected with a gate of the transistor. The capacitor has one electrode connected with a cathode of the diode and the other electrode connected with an emitter of the transistor.

摘要翻译： 本说明书涉及一种包括两个晶体管的串联连接的电力转换器，并且提供了一种用于在两个晶体管同时导通一些有缺陷的原因时抑制流过晶体管的电流的增加的技术。 本文公开的电力转换器包括第一晶体管和第二晶体管的串联连接。 电力转换器包括钳位电路，其被配置为抑制在至少第一晶体管或第二晶体管中提供的栅极电压的异常上升。 钳位电路包括二极管和电容器。 二极管具有与晶体管的栅极连接的阳极。 电容器具有与二极管的阴极连接的一个电极，而另一个电极与晶体管的发射极连接。

公开(公告)号：US07378825B2

公开(公告)日：2008-05-27

申请号：US11730790

申请日：2007-04-04

申请人： Kenichi Nakata ,  Mikiya Doi

发明人： Kenichi Nakata ,  Mikiya Doi

IPC分类号： G05F1/40

CPC分类号： H02M3/156 ,  H02M2001/0025

摘要： A DC/DC converter is supplied such that the desired output setting voltage can be obtained as the load-side output, even when the difference between the power supply voltage and the output setting voltage of the load-side output is large. This DC/DC converter comprises a switching device, a voltage divider, an error amplifier, an oscillator which outputs a oscillation clock, a slope circuit which receives the oscillation clock and outputs a sawtooth waveform voltage having a slope which begins at the leading edge of the oscillation clock, a comparator which compares the sawtooth waveform voltage and the output voltage of the error amplifier, and a logic circuit which is set by the trailing edge of the oscillation clock, and is reset by the output of the comparator.

摘要翻译： 提供DC / DC转换器，使得即使当电源电压和负载侧输出的输出设置电压之间的差异大时，也可以获得期望的输出设定电压作为负载侧输出。 该DC / DC转换器包括开关装置，分压器，误差放大器，输出振荡时钟的振荡器，接收振荡时钟的斜坡电路，并输出具有斜率的锯齿波形电压，斜坡开始于 振荡时钟，比较器，其比较锯齿波形电压和误差放大器的输出电压，以及由振荡时钟的后沿设置的逻辑电路，并由比较器的输出复位。

公开(公告)号：US20070236199A1

公开(公告)日：2007-10-11

申请号：US11784874

申请日：2007-04-09

申请人： Kenichi Nakata

发明人： Kenichi Nakata

IPC分类号： G05F1/00

CPC分类号： H02M3/1588 ,  H03K2217/0036 ,  Y02B70/1466

摘要： A step-up DC/DC converter uses N-channel field-effect transistors as both an output transistor and a synchronous-rectification transistor and includes a first driver making the gate voltage of the output transistor pulsate between a ground voltage and an input voltage and a second driver making the gate voltage of the synchronous-rectification transistor pulsate between a switching voltage and a bootstrap voltage equal to the switching voltage plus at least the ON threshold voltage of the synchronous-rectification transistor. With this configuration, the converter opeates with improved power efficiency and performs synchronous rectification unhindered even with a small input-output voltage difference.

摘要翻译： 升压DC / DC转换器使用N沟道场效应晶体管作为输出晶体管和同步整流晶体管，并且包括使得输出晶体管的栅极电压在接地电压和输入电压之间脉动的第一驱动器， 使第二驱动器使同步整流晶体管的栅极电压在开关电压和等于开关电压加上至少同步整流晶体管的导通阈值电压的自举电压之间脉动。 通过这种配置，转换器具有提高的功率效率，并且即使在小的输入 - 输出电压差下也能够不受阻碍地执行同步整流。