公开(公告)号：US5043210A

公开(公告)日：1991-08-27

申请号：US553602

申请日：1990-07-18

申请人： Yoshisuke Yamakawa ,  Yoshihiro Honjo ,  Hiroshi Kawahara ,  Masashi Hayama

发明人： Yoshisuke Yamakawa ,  Yoshihiro Honjo ,  Hiroshi Kawahara ,  Masashi Hayama

IPC分类号： C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/00 ,  C09D175/04 ,  G11B5/008 ,  G11B5/02 ,  G11B5/716 ,  G11B5/73 ,  G11B5/78 ,  G11B5/84 ,  G11B5/842 ,  H04N5/782

CPC分类号： G11B5/716 ,  G11B5/00813 ,  G11B5/02 ,  G11B5/78 ,  G11B5/84 ,  H04N5/78213 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/257 ,  Y10T428/265

摘要： A magnetic recording medium is used with a magnetic recording system in which a baseband recording signal is recorded on a magnetic recording medium and a surface-band recording signal with the effective recording depth being smaller than that of the baseband recording signal is then recorded thereon in superimposed relation. The non-magnetic substrate includes thereon a first magnetic layer and a second magnetic layer on that order, said second magnetic layer having a thickness substantially equal to the effective recording depth of said surface-band recording signal and a coercivity higher than that of said first magnetic layer.

公开(公告)号：US5532041A

公开(公告)日：1996-07-02

申请号：US262366

申请日：1994-06-20

申请人： Yoshihiro Honjo ,  Yoshisuke Yamakawa ,  Hiroshi Kawahara ,  Eizo Tsunoda

发明人： Yoshihiro Honjo ,  Yoshisuke Yamakawa ,  Hiroshi Kawahara ,  Eizo Tsunoda

IPC分类号： C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/00 ,  C09D175/04 ,  G11B5/00 ,  G11B5/716 ,  G11B5/73 ,  G11B5/842 ,  G11B5/66 ,  B32B3/10 ,  B32B5/16

CPC分类号： G11B5/716 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/26 ,  Y10T428/265

摘要： A magnetic recording medium records two or more signals having different frequency bands by frequency multiplex recording. The non-magnetic substrate includes a first magnetic layer and a second magnetic layer on that order, said second magnetic layer having a thickness amounting to 70% or less of the shortest recording wavelength of the signals to be recorded.

摘要翻译： 磁记录介质通过频率复用记录记录具有不同频带的两个或多个信号。 非磁性基板在该顺序上包括第一磁性层和第二磁性层，所述第二磁性层的厚度为要记录的信号的最短记录波长的70％以下。

公开(公告)号：US5110659A

公开(公告)日：1992-05-05

申请号：US522079

申请日：1990-05-10

申请人： Yoshisuke Yamakawa ,  Kiyoto Fukushima ,  Koji Matsuno

发明人： Yoshisuke Yamakawa ,  Kiyoto Fukushima ,  Koji Matsuno

IPC分类号： B24B19/26 ,  B24D11/00 ,  C08J5/14 ,  G11B5/127 ,  G11B5/187 ,  G11B5/41 ,  G11B5/53

CPC分类号： B24D11/00 ,  B24B19/26 ,  G11B5/1871 ,  G11B5/41 ,  G11B5/53 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/257

摘要： A lapping tape has an abrasive coat which comprises an acicular iron oxide powder having a surface area of at least 30 m.sup.2 /g as determined by the BET method and a granular inorganic powder having a Moh's hardness of more than 7 and contained in an amount of from 2.0 to 30 percent by weight on the basis of the weight of the oxide powder. The coat has a centerline mean roughness between 0.015 and 0.03 .mu.m. Preferably the acicular iron oxide is magnetic, and the inorganic powder ranges in particle diameter from 0.05 to 0.4 .mu.m.

摘要翻译： 研磨带具有磨料涂层，其包含通过BET法测定的表面积至少为30m 2 / g的针状氧化铁粉末和莫氏硬度大于7的粒状无机粉末，其含量为 基于氧化物粉末的重量，为2.0〜30重量％。 该涂层的中心线平均粗糙度在0.015和0.03μm之间。 针状氧化铁优选为磁性，无机粉末的粒径为0.05〜0.4μm。

公开(公告)号：US4684546A

公开(公告)日：1987-08-04

申请号：US930512

申请日：1986-11-14

申请人： Yasumichi Tokuoka ,  Yoshisuke Yamakawa ,  Akio Watanabe

发明人： Yasumichi Tokuoka ,  Yoshisuke Yamakawa ,  Akio Watanabe

IPC分类号： C09D5/23 ,  C09D7/12 ,  G11B5/70 ,  G11B5/73 ,  G11B5/735 ,  G11B5/84 ,  G11B5/842 ,  H01F10/02

CPC分类号： G11B5/70 ,  G11B5/7305 ,  G11B5/842 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/257

摘要： A magnetic recording medium having a magnetic coating containing therein ferromagnetic metal powder provided on a base film, wherein the magnetic recording medium being characterized in that the surface roughness of the magnetic coating, i.e., the surface roughness R.sub.rms (a unit of measurement of .mu.m) with respect to a waveform having a wavelength P in a range of from 3 to 50 .mu.m out of groups of waveforms constituting the cross-sectional waveform of the surface of the magnetic coating, satisfies the following equation.R.sub.rms .ltoreq.7.5.times.10.sup.-4 P+7.5.times.10.sup.-3where 3.ltoreq.P.ltoreq.50 .mu.m.

摘要翻译： 一种具有磁性涂层的磁记录介质，其中含有设置在基膜上的强磁性金属粉末，其中所述磁记录介质的特征在于，所述磁性涂层的表面粗糙度，即表面粗糙度R rms（测量单位为μm ）相对于构成磁性涂层表面的截面波形的波形组中的波长为3〜50μm的范围的波形满足下式。 Rrms

公开(公告)号：US4663246A

公开(公告)日：1987-05-05

申请号：US617535

申请日：1984-06-05

申请人： Yasumichi Tokuoka ,  Yoshisuke Yamakawa ,  Akio Watanabe

发明人： Yasumichi Tokuoka ,  Yoshisuke Yamakawa ,  Akio Watanabe

IPC分类号： C09D5/23 ,  C09D7/12 ,  G11B5/70 ,  G11B5/73 ,  G11B5/735 ,  G11B5/84 ,  G11B5/842 ,  G11B5/72 ,  B32B3/00

CPC分类号： G11B5/70 ,  G11B5/7305 ,  G11B5/842 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/257

摘要： A magnetic recording medium having a magnetic coating containing therein ferromagnetic metal powder provided on a base film, wherein the magnetic recording medium being characterized in that the surface roughness of the magnetic coating, i.e., the surface roughness R.sub.rms (a unit of measurement of .mu.m) with respect to a waveform having a wavelength P in a range of from 3 to 50 .mu.m out of groups of waveforms constituting the cross-sectional waveform of the surface of the magentic coating, satisfies the following equation:R.sub.rms .ltoreq.7.5.times.10.sup.-4 P+7.5.times.10.sup.-3where 3.ltoreq.P.ltoreq.50 .mu.m.

摘要翻译： 一种具有磁性涂层的磁记录介质，其中含有设置在基膜上的强磁性金属粉末，其中所述磁记录介质的特征在于，所述磁性涂层的表面粗糙度，即表面粗糙度R rms（测量单位为μm ）相对于构成磁性涂层表面的横截面波形的波形组中的波长为3〜50μm的波形的波形满足下式：Rrms <= 7.5×10 -4P + 7.5×10 -3，其中3≤P≤50μm。