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1. 发明授权

US5427869A Magnetic recording medium and method for producing the same 失效
标题翻译：磁记录介质及其制造方法
公开(公告)号：US5427869A
公开(公告)日：1995-06-27
申请号：US103759
申请日：1993-08-10
申请人： Ryuji Sugita , Kiyokazu Tohma , Tatsuaki Ishida , Yasuaki Ban
发明人： Ryuji Sugita , Kiyokazu Tohma , Tatsuaki Ishida , Yasuaki Ban
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/73 , G11B5/85
CPC分类号： G11B5/65 , G11B5/656 , G11B5/85 , Y10S428/90
摘要： A magnetic recording medium includes a nonmagnetic substrate and a magnetic layer which is formed on a surface of the substrate and which has an axis of easy magnetization inclined from a direction to normal plane of the layer. An angular dependency of coercive force, of the medium which is measured by changing an application angle of a magnetic field in a range relative to -90.degree. to +90.degree. from the plane of the layer with a plane normal to the layer and including the axis of easy magnetization, has two local maximum values and two local minimum values. A ratio of the local maximum value closer to a plane direction to the minimum value closer of the layer to the local plane direction of the layer is from 1.6 to 2.4, and the local maximum value closer to the plane direction of the layer is larger than the local maximum value closer to the line normal to of the plane of the layer. The medium has a high S/N ratio.
摘要翻译：磁记录介质包括非磁性基板和磁性层，该磁性层形成在基板的表面上，并且具有从层的方向到法线平面的易磁化轴。介质的矫顽力的角度依赖性，其通过将具有与该层垂直的平面相对于-90°至+90°的范围内的磁场的施加角度改变而测量，并且包括轴易于磁化，具有两个局部最大值和两个局部最小值。局部最大值比平面方向的距离越接近层的距离越靠近层的局部平面方向的最小值的比值为1.6到2.4，并且更靠近层的平面方向的局部最大值大于局部最大值越接近层的平面垂直线。介质具有较高的S / N比。

2. 发明授权

US5534324A Magnetic recording medium and method for producing the same 失效
标题翻译：磁记录介质及其制造方法
公开(公告)号：US5534324A
公开(公告)日：1996-07-09
申请号：US151704
申请日：1993-11-10
申请人： Ryuji Sugita , Kiyokazu Tohma , Tatsuaki Ishida , Yasuaki Ban
发明人： Ryuji Sugita , Kiyokazu Tohma , Tatsuaki Ishida , Yasuaki Ban
IPC分类号： G11B5/64 , G11B5/65 , G11B5/66 , G11B5/73 , G11B5/738 , G11B5/85 , H01F1/00 , G11B5/70
CPC分类号： G11B5/66 , Y10S428/90 , Y10T428/12465 , Y10T428/12931
摘要： A magnetic recording medium has a cobalt-based first magnetic layer and a cobalt-based second magnetic layer which are formed on a substrate of high polymer by vacuum evaporation. In order to have a high reproducing output and a high S/N ratio, the first magnetic layer has high oxygen density area which is arranged at a vicinity of the second magnetic layer, and the second magnetic layer has high oxygen density area which is arranged at a vicinity of the first magnetic layer.
摘要翻译：磁记录介质具有钴基第一磁性层和钴基第二磁性层，它们通过真空蒸镀形成在高分子的基片上。为了具有高再现输出和高S / N比，第一磁性层具有高氧浓度区域，其布置在第二磁性层附近，并且第二磁性层具有高的氧气密度区域，其被布置在第一磁性层附近。

3. 发明授权

US5472506A Method and apparatus for producing magnetic recording medium 失效
标题翻译：制造磁记录介质的方法和装置
公开(公告)号：US5472506A
公开(公告)日：1995-12-05
申请号：US367998
申请日：1995-01-03
申请人： Kiyokazu Tohma , Ryuji Sugita , Tatsuaki Ishida , Yasuaki Ban
发明人： Kiyokazu Tohma , Ryuji Sugita , Tatsuaki Ishida , Yasuaki Ban
IPC分类号： G11B5/85 , C23C14/00
CPC分类号： G11B5/85
摘要： A magnetic recording medium having good high density recording characteristics is produced by forming a magnetic layer on a substrate which is traveling around a peripheral surface of a cylindrical can by an oblique vapor deposition method to form a magnetic layer comprising cobalt, an axis of easy magnetization of which inclined from a line normal to the layer plane. A residual gas pressure in an initial region of the formation of the magnetic layer is kept as low as possible, in particular, the residual gas pressure in the initial region of the formation of the magnetic layer is lower than in the other part of the production apparatus.
摘要翻译：具有良好高密度记录特性的磁记录介质通过在通过倾斜气相沉积法绕圆筒形罐的周面行进的基板上形成磁性层来形成包含钴的磁性层，易磁化轴其从垂直于层平面的线倾斜。形成磁性层的初始区域中的残留气体压力尽可能地保持低，特别是形成磁性层的初始区域中的残余气体压力低于制造的其它部分仪器。

4. 发明授权

US5458914A Method for producing magnetic recording medium 失效
标题翻译：磁记录介质的制造方法
公开(公告)号：US5458914A
公开(公告)日：1995-10-17
申请号：US367996
申请日：1995-01-03
申请人： Kiyokazu Tohma , Ryuji Sugita , Tatsuaki Ishida , Yasuaki Ban
发明人： Kiyokazu Tohma , Ryuji Sugita , Tatsuaki Ishida , Yasuaki Ban
IPC分类号： G11B5/85 , H01F10/00
CPC分类号： G11B5/85
摘要： A magnetic recording medium having good high density recording characteristics is produced by forming a magnetic layer on a substrate which is traveling around a peripheral surface of a cylindrical can by an oblique vapor deposition method to form a magnetic layer comprising cobalt, an axis of easy magnetization of which inclined from a line normal to the layer plane. A residual gas pressure in an initial region of the formation of the magnetic layer is kept as low as possible, in particular, the residual gas pressure in the initial region of the formation of the magnetic layer is lower than in the other part of the production apparatus.
摘要翻译：具有良好高密度记录特性的磁记录介质通过在通过倾斜气相沉积法绕圆筒形罐的周面行进的基板上形成磁性层来形成包含钴的磁性层，易磁化轴其从垂直于层平面的线倾斜。形成磁性层的初始区域中的残留气体压力尽可能地保持低，特别是形成磁性层的初始区域中的残余气体压力低于制造的其它部分仪器。

5. 发明授权

US5418059A Magnetic recording medium and method for producing the same 失效
标题翻译：磁记录介质及其制造方法
公开(公告)号：US5418059A
公开(公告)日：1995-05-23
申请号：US70981
申请日：1993-06-04
申请人： Ryuji Sugita , Kiyokazu Tohma , Tatsuaki Ishida , Yasuaki Ban
发明人： Ryuji Sugita , Kiyokazu Tohma , Tatsuaki Ishida , Yasuaki Ban
IPC分类号： G11B5/64 , G11B5/65 , G11B5/66 , G11B5/73 , G11B5/738 , G11B5/85 , G11B5/00
CPC分类号： G11B5/66 , Y10T428/12465 , Y10T428/12931 , Y10T428/26 , Y10T428/265
摘要： A magnetic recording medium having a nonmagnetic substrate, a first magnetic layer which is formed on a surface of the substrate, has an axis of easy magnetization slanting from a normal line of a layer plane, contains cobalt and oxygen in an amount of not more than 40 atomic % and has a thickness of not larger than 0.15 .mu.m, and a second magnetic layer which is formed on a surface of the first magnetic layer, contains cobalt, has an axis of easy magnetization slanting from a normal line of a layer plane, contains oxygen in an amount of not larger than 37 atomic % and from 61 % to 99 % of the oxygen concentration in the first layer, and has a thickness of not larger than 0.15 .mu.m, which medium has a large S/N ratio.
摘要翻译：具有非磁性基板的磁记录介质，形成在基板的表面上的第一磁性层具有从层平面的法线倾斜的易磁化轴，其含有不大于 40原子％，并且具有不大于0.15μm的厚度，并且形成在第一磁性层的表面上的含有钴的第二磁性层具有从层平面的法线倾斜的易磁化轴含有第一层中氧浓度不大于37原子％和61％至99％的氧，并且具有不大于0.15μm的厚度，该介质具有大的S / N比。

6. 发明授权

US5554440A Magnetic recording medium and method for producing the same 失效
标题翻译：磁记录介质及其制造方法
公开(公告)号：US5554440A
公开(公告)日：1996-09-10
申请号：US118326
申请日：1993-09-09
申请人： Tatsuaki Ishida , Ryuji Sugita , Kiyokazu Tohma , Yasuaki Ban
发明人： Tatsuaki Ishida , Ryuji Sugita , Kiyokazu Tohma , Yasuaki Ban
IPC分类号： G11B5/64 , G11B5/65 , G11B5/66 , G11B5/73 , G11B5/738 , G11B5/85 , H01F1/11 , G11B5/70
CPC分类号： G11B5/656 , G11B5/66 , G11B5/85 , Y10S428/90 , Y10T428/265
摘要： A magnetic tape having a polymer substrate and a magnetic layer which is formed directly on a surface of the substrate or on a primer layer formed on the substrate and contains cobalt, oxygen and optionally nickel, in which a coercive force is at least 120 kA/m and a squareness ratio is at least 0.9 in a hysteresis loop which is obtained when a magnetic field is applied in a plane of the magnetic layer in a longitudinal direction of the magnetic tape, and on the hysteresis loop, an intensity of the applied magnetic field, at which a magnetization when the applied magnetic field is increased is 99% of the magnetization when the applied magnetic field is decreased, is not larger than 400 kA/m, and preferably, a ratio of a value of magnetization at an intersection between a tangential line drawn at a point which gives a residual magnetization at the applied magnetic field of 0 (zero) and a tangential line drawn at a point which gives a coercive force with a magnetization of 0 in a second quadrant to said residual magnetization is at least 0.9, which magnetic tape has improved high density recording/reproducing properties.
摘要翻译：一种具有聚合物基材和磁性层的磁带，其直接形成在基材的表面上或形成在基材上的底漆层上，并且含有钴，氧和任选的镍，矫顽力为至少120kA / m，当在磁带的纵向方向上的磁性层的平面中施加磁场时，在磁滞回线中，矩形比至少为0.9，在磁滞回线上，所施加的磁体的强度当所施加的磁场增加时的磁化强度是施加的磁场减小时的磁化强度的99％，不大于400kA / m，优选地，在相交处的磁化强度的比值在施加的磁场为0（零）的点处绘制的切线，以及在第二次给出磁化强度为0的矫顽力的点处画出的切线所述残余磁化强度的象限至少为0.9，该磁带具有改善的高密度记录/再现特性。

7. 发明授权

US06858329B2 Master disc and method for manufacturing magnetic disc using the same 失效
标题翻译：主盘及其制造方法
公开(公告)号：US06858329B2
公开(公告)日：2005-02-22
申请号：US09980183
申请日：2001-03-29
申请人： Taizou Hamada , Hideyuki Hashi , Tatsuaki Ishida , Nobuyuki Komura , Yasuaki Ban , Keizo Miyata , Kiyokazu Tohma
发明人： Taizou Hamada , Hideyuki Hashi , Tatsuaki Ishida , Nobuyuki Komura , Yasuaki Ban , Keizo Miyata , Kiyokazu Tohma
IPC分类号： G11B5/596 , G11B5/82 , G11B5/86 , G11B23/50 , G11B5/66
CPC分类号： B82Y10/00 , G11B5/59633 , G11B5/743 , G11B5/82 , G11B5/865 , G11B23/505
摘要： A master disc capable of conducting a preformat recording by a magnetic transcription without causing any unevenness over an entire magnetic disc is provided. The master disc is provided with a radial land portion where an array of ferromagnetic thin films is formed and a concave portion against the land portion. The land portion and the concave portion are formed such that the land portion is joined with the surface of the magnetic disc when the present magnetic disc is overlapped on the magnetic disc, and that the concave portion is not contacted with the surface of the magnetic disc, and also that a space surrounded by the surface of the magnetic disc and the concave portion is open to air at a peripheral end portion of the magnetic disc.
摘要翻译：提供能够通过磁转录进行预格式化记录而不在整个磁盘上造成任何不均匀的母盘。主盘设置有形成铁磁性薄膜阵列的径向接地部分和抵靠陆部的凹部。当磁盘重叠在磁盘上时，陆部和凹部形成为使得陆部与磁盘的表面接合，并且凹部不与磁盘的表面接触并且由磁盘的表面和凹部包围的空间在磁盘的周边端部对空气开放。

8. 发明授权

US06646820B1 Method for recording magnetic recording medium 失效
标题翻译：记录磁记录介质的方法
公开(公告)号：US06646820B1
公开(公告)日：2003-11-11
申请号：US09869947
申请日：2001-07-03
申请人： Tatsuaki Ishida , Taizou Hamada , Hideyuki Hashi , Keizo Miyata , Yasuaki Ban , Hiromi Kita
发明人： Tatsuaki Ishida , Taizou Hamada , Hideyuki Hashi , Keizo Miyata , Yasuaki Ban , Hiromi Kita
IPC分类号： G11B586
CPC分类号： G11B5/865 , G11B5/127 , G11B5/23 , G11B5/82
摘要： A master information carrier (2) with an arranged pattern formed of a ferromagnetic film in a shape corresponding to information signals is superposed on a magnetic recording medium (1) and the arranged pattern formed of a ferromagnetic film is magnetized with a magnetizing head (6), thus transfer-recording the arranged pattern into the magnetic recording medium as a magnetized pattern. The magnetizing head includes an annular magnetic circuit with a gap, and a strength of a magnetic field applied to the master information carrier by magnetic flux leaking from portions other than the gap is set to be 20% or less of that of a magnetic field applied to the master information carrier by magnetic flux leaking from the gap. Quality deterioration due to various conditions during recording can be prevented and uniform recording with less variation depending on position on the magnetic recording medium is achieved.
摘要翻译：具有与信息信号相对应的铁磁膜形成的排列图案的主信息载体（2）叠加在磁记录介质（1）上，由铁磁膜形成的排列图案被磁化头（6 ），从而将布置的图案作为磁化图案转印记录到磁记录介质中。磁化头包括具有间隙的环形磁路，并且通过从除了间隙之外的部分泄漏的磁通量施加到主信息载体的磁场强度设定为施加的磁场的磁场强度的20％以下通过磁通从主信息载体泄漏出来。可以防止由记录期间的各种条件导致的质量劣化，并且实现根据磁记录介质上的位置具有较小变化的均匀记录。

9. 发明授权

US06914735B2 Manufacturing method for magnetic recording medium, and master information carrier used therefor 失效
标题翻译：磁记录介质的制造方法和用于其的主信息载体
公开(公告)号：US06914735B2
公开(公告)日：2005-07-05
申请号：US10261673
申请日：2002-10-02
申请人： Taizou Hamada , Tatsuaki Ishida , Yasuaki Ban
发明人： Taizou Hamada , Tatsuaki Ishida , Yasuaki Ban
IPC分类号： G11B5/86 , G11B5/84
CPC分类号： G11B5/865
摘要： In a manufacturing method for a magnetic recording medium, when the length of a ferromagnetic thin film on a master information carrier corresponding to the length between a pair of magnetization transition regions adjacent to each other is A in magnetization information recorded onto a magnetic recording medium, the film thickness of the ferromagnetic thin film is t and A/t is k, k is set from not less than 0.8 to not more than 8.
摘要翻译：在磁记录介质的制造方法中，当与记录在磁记录介质上的磁化信息中的相互相邻的一对磁化过渡区之间的长度上的主信息载体上的铁磁性薄膜的长度为A时，铁磁薄膜的膜厚为t，A / t为k，k设定为0.8以上8以下。

10. 发明授权

US07061703B2 Master information carrier and method for manufacturing magnetic disc using the same 失效
公开(公告)号：US07061703B2
公开(公告)日：2006-06-13
申请号：US10686145
申请日：2003-10-14
申请人： Tatsuaki Ishida , Keizo Miyata , Nobuyuki Komura , Yasuaki Ban , Taizou Hamada , Hideyuki Hashi
发明人： Tatsuaki Ishida , Keizo Miyata , Nobuyuki Komura , Yasuaki Ban , Taizou Hamada , Hideyuki Hashi
IPC分类号： G11B5/86
CPC分类号： B82Y10/00 , G11B5/59633 , G11B5/743 , G11B5/82 , G11B5/865
摘要： A master information carrier capable of manufacturing a magnetic recording medium in which a preformat recording of information signals causing no reproduction signal detection errors arising from a pulse shift of a reproduction waveform is performed. A master information carrier 1 has an array of ferromagnetic thin films 3 arranged according to the pattern of information signals and is used for forming magnetization 4 of a pattern corresponding to the array pattern of the ferromagnetic thin film 3 in a magnetic recording medium by applying a magnetic field while opposing the master information carrier 1 against a magnetic recording medium 2. Each of the ferromagnetic thin films 3 is formed such that each pattern length A becomes equal to a length including a correction amount α in addition to a length a between magnetic transition areas 6 of the magnetization 4 to be formed in the magnetic recording medium 2.

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