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61. 发明专利

JPH01292625A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH01292625A
公开(公告)日：1989-11-24
申请号：JP12075988
申请日：1988-05-19
申请人： HITACHI LTD
发明人： INOUE YOICHI , ICHIKAWA KOJI , TANAKA KATSUYUKI , AMANO HIDEAKI , OURA MASAKI
IPC分类号： G11B5/82 , G11B5/64 , G11B5/738 , G11B23/00
摘要： PURPOSE:To enable recording of prescribed data such as servo signals and to improve the mass productivity and efficiency of a disk medium by forming prescribed information as a change in the shapes of hollow grooves or ruggedness on the surface of an underlying layer and providing a magnetic layer on this underlying layer. CONSTITUTION:The underlying layer 2 consisting of polycarbonate formed with the pits 2a corresponding to the prescribed information data by injection molding is provided onto a substrate 1 and the thin film of the magnetic layer 3 is formed by sputtering on this layer 2. The magnetic layer 3 is, therefore, formed to the thin film conforming to the shape of the layer 2 and is formed with the pits 3a. A protective layer 4 is then formed on the layer 2 to fill the pits 3a and to simultaneously decrease the ruggedness on the surface of the magnetic disk. The recording of the prescribed data such as servo signals by shape transfer is thereby enabled and the mass productivity and efficiency of the disk medium is improved.

62. 发明专利

JPS63251912A CONTINUOUS MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS63251912A
公开(公告)日：1988-10-19
申请号：JP8473187
申请日：1987-04-08
申请人： HITACHI LTD
发明人： SUZUKI HIROYUKI , SHIROISHI YOSHIHIRO , HISHIYAMA SADAO , OONO TADASHI , MATSUDA YOSHIFUMI , TAKAGI KAZUMASA , KURODA KATSUHIRO , TSUMITA NORIKAZU , OURA MASAKI , NAGAIKE SADAKUNI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/706 , G11B5/73 , G11B5/738
摘要： PURPOSE:To eliminate modulation and to improve recording and reproducing characteristics as well as corrosion resistance by forming the crystal grains on the front faces of magnetic layers to nearly irregularly arranged elliptical or needle-like shapes and specifying the ratio of the length between the major axis and minor axis thereof. CONSTITUTION:The crystal grains on the front faces of the magnetic layers 13, 13' or the crystal grains on the surfaces of underlying layers 12, 12' are nearly irregularly arranged and are formed to the elliptical or needle-like surface shapes. The ratio of the length between the major axis and minor axis thereof is specified to >=2. Such magnetic recording medium is formed by a method of controlling the shape of the magnetic layers or the underlying layers in high gaseous Ar of about 10mTorr prior to the formation of the magnetic layers. The recording and reproducing characteristics of the medium can be changed by controlling the surface shapes of the underlying layers 12, 12' and the magnetic materials 13, 13' in such a manner and, therefore, the modulation and noise are decreased, S/N is improved and the high-performance magnetic recording medium is obtd.

63. 发明专利

JPS63234407A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS63234407A
公开(公告)日：1988-09-29
申请号：JP6569787
申请日：1987-03-23
申请人： HITACHI LTD
发明人： YOSHIDA KAZUYOSHI , SHIROISHI YOSHIHIRO , SAITO MAKOTO , TSUMITA NORIKAZU , YAMASHITA TAKEO , SUZUKI HIROYUKI , KITAZAKI YOUJI , OURA MASAKI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/706 , G11B5/73 , G11B5/738
摘要： PURPOSE:To improve the S/N characteristic of a magnetic recording medium by constituting the magnetic recording medium having a thin magnetic film having a specific range of the rotational hysteresis integral loss value RH determined by measuring the thin magnetic film to be formed as a magnetic recording layer by a magnetic torque meter. CONSTITUTION:A rotational hysteresis loss value Wr which is expressed by loss equation I and is determined by rotating the sample of the thin magnetic film drawn from the magnetic recording medium under impression of a magnetic field thereto and measuring the magnetic anisotropy thereof by using the magnetic torque meter is divided by the saturation magnetic flux density Is of the thin magnetic film and is further integrated by the inverse number of the magnitude H of the magnetic field to determine the rotational hysteresis integral loss value RH by equation II. The thin magnetic film, of which the rotational hysteresis integral loss values RH obtd. in the above-mentioned manner is within a 0.4-1.3 range is used as the magnetic recording layer. In equation I, L denotes the magnitude of the torque of unit volume of the sample and theta denotes a rotating angle. Medium noises are drastically decreased and the magnetic recording medium having the excellent S/N characteristic and high reliability is obtd.

64. 发明专利

JPS61131218A Thin-film magnetic head slider 失效
标题翻译：薄膜磁头滑块
公开(公告)号：JPS61131218A
公开(公告)日：1986-06-18
申请号：JP25270184
申请日：1984-11-29
申请人： Hitachi Ltd
发明人： HIGUCHI SHINSUKE , TAKEDA YUKIO , IIJIMA SHIRO , OURA MASAKI , NAGAIKE SADAKUNI
IPC分类号： G11B5/60 , G11B21/21
摘要： PURPOSE: To improve the slidability of a recording medium and facilitate machining by using a slider of ≤5μm in mean crystal grain size which has enough heat insulation to decompose thermally the binder of a recording medium when sliding on the recording medium where a slider contacts the recording medium.
CONSTITUTION: A thin-film magnetic head element is formed on an end surface of a slider which starts and stops in contact with the recording medium. The part of this slider which contacts the recording medium uses the sinter of ≤5μm in mean crystal grain size which has enough heat insulation to decompose thermally and carbonize the binder of the recording medium when sliding on the recording medium. The heat conductivity of this sinter is ≤0.02cal/cm, sec, °C and the sinter contains at least cubic ZrO
2 . Thus, the slidability and machinability of the recording medium are improved and the life of the recording medium is prolonged.
COPYRIGHT: (C)1986,JPO&Japio
摘要翻译：目的：为了提高记录介质的滑动性，并且通过使用具有足够的隔热度的<= 5mum的滑块来进行机械加工，以便在滑块接触的记录介质上滑动时将记录介质的粘结剂热分解记录介质。构成：薄片磁头元件形成在与记录介质接触的滑块的端面上。与记录介质接触的该滑块的部分使用具有足够隔热性的平均晶粒尺寸的<= 5um的烧结物，以便在记录介质上滑动时热分解并碳化记录介质的粘合剂。该烧结体的导热系数<0.02cal / cm，sec，℃，烧结体含有至少立方ZrO 2。因此，改善了记录介质的滑动性和机械加工性，延长了记录介质的使用寿命。

65. 发明专利

JPS6180612A Thin film magnetic head 失效
标题翻译：薄膜磁头
公开(公告)号：JPS6180612A
公开(公告)日：1986-04-24
申请号：JP20169984
申请日：1984-09-28
申请人： Hitachi Ltd
发明人： TAKAGI MASAYUKI , OURA MASAKI
IPC分类号： G11B5/09 , G11B5/31
CPC分类号： G11B5/3109 , G11B5/09
摘要： PURPOSE:To obtain a thin film magnetic head possible for high density recording by decreasing the thickness of the 2nd magnetic layer more than that of the 1st magnetic layer, providing the effect reducing the peak shift due to reproduced wave interference and adopting a high magnetic flux density material only for the 1st magnetic layer so as to increase the write magnetic field without changing the reproducing characteristic. CONSTITUTION:When the same film thickness is given to the 1st magnetic layer 3 and the 2nd magnetic layer 6, a difference is given to the undershoot produced to an isolate reproducing waveform and a peak shift where a position of a waveform peak located substantially is shifted takes place. Since the undershoot depends on the thickness of the magnetic layer, it is desired to make the thickness of the 1st magnetic layer 3 thinner than that of the 2nd magnetic layer 6, but if the 1st magnetic layer 3 is formed too thin, a magnetic saturation is caused to decrease the recording magnetic field. Thus, a magnetic material having a saturation magnetic flux density being nearly 1.2-1.4 time of that of the 2nd magnetic layer is used for the 1st magnetic layer to make the film thickness thin and avoid the magnetic saturation. Concretely, an Ni-Fe alloy is used for the 2nd magnetic layer, and an Ni-Co-Fe alloy is used for the 1st magnetic layer.
摘要翻译：目的：为了通过减小第二磁性层的厚度比第一磁性层的厚度更大地获得可能用于高密度记录的薄膜磁头，提供减少由再生波干涉引起的峰值偏移并采用高磁通量的效果仅用于第一磁性层，从而增加写入磁场而不改变再现特性。构成：当对第一磁性层3和第二磁性层6赋予相同的膜厚度时，对隔离再现波形产生的下冲和基本上位移的波峰的位置偏移的峰移发生。由于下冲取决于磁性层的厚度，因此期望使第一磁性层3的厚度比第二磁性层6的厚度薄，但是如果第一磁性层3形成得太薄，则磁饱和导致记录磁场减小。因此，具有第二磁性层的饱和磁通密度接近1.2-1.4倍的磁性材料用于第一磁性层以使膜厚变薄并避免磁饱和。具体地说，对于第2磁性层使用Ni-Fe合金，对于第1磁性层使用Ni-Co-Fe合金。

66. 发明专利

JP2003223708A MAGNETIC STORAGE DEVICE 审中-公开
公开(公告)号：JP2003223708A
公开(公告)日：2003-08-08
申请号：JP2003009812
申请日：2003-01-17
申请人： HITACHI LTD
发明人： YAMAMOTO TOMOO , SHIROISHI YOSHIHIRO , ISHIKAWA AKIRA , KAMISAKA YASUTARO , HISHIYAMA SADAO , OONO TSUGUYUKI , YAKU YOTSUO , OURA MASAKI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/738
摘要： PROBLEM TO BE SOLVED: To provide a multilayer magnetic recording medium and a mass high density magnetic storage device of which the S/N at high density recording and the property of recording density are excellent. SOLUTION: A magnetic recording medium has a non-magnetic substrate, a plurality of magnetic layers provided on the non-magnetic substrate, and non-magnetic intermediate layers located between the magnetic layers. Further, the medium is constituted so that respective film thicknesses of the plurality of magnetic layers differ and the respective products of the residual magnetization and thickness are substantially equal or respective residual magnetizations differ. This device is a magnetic storage device combined with the magnetic recording medium and a magnetic head using a metal thin film at least in a part of a magnetic pole or a magnetic head utilizing the magnetoresistive effect for reproducing. COPYRIGHT: (C)2003,JPO

67. 发明专利

JPH08297837A PRODUCTION OF MAGNETIC DISK 失效
公开(公告)号：JPH08297837A
公开(公告)日：1996-11-12
申请号：JP10705296
申请日：1996-04-26
申请人： HITACHI LTD
发明人： NAKAMURA TAKAO , SEKIYAMA SHINYA , OURA MASAKI , KATO YOSHIKI , OKAMOTO NORIAKI
IPC分类号： G11B5/82 , G11B5/73 , G11B5/738 , G11B5/84 , G11B5/85
摘要： PURPOSE: To prevent the occurrence of a head crash by providing the surface of a substrate with fine grooves and grinding the projecting parts built up and formed by the formation of these fine grooves by the prescribed quantity from the peak parts thereof as a second grinding stage. CONSTITUTION: A substrate is rotated by a motor 3 and simultaneously, a first working head H1 is oscillated at the set oscillation amplitude by a motor 16 for oscillation when a substrate working device is turned on. Grinding tapes 4a, 4b are then taken up under specified force by a grinding tape driving device 7 and the pressurizing force on the substrate is so adjusted as to attain the set first pressurizing force. The fine grooves are formed on the surface of the substrate 2 by the grinding tapes 4a, 4b if a reciprocating moving base 22 is moved forward and backward by a reciprocating moving means R. In such a case, a controller 17 is capable of maintaining the specified pressurizing force of contact rollers 8, 9 on the substrate 2 by controlling a motor 14 regardless of the fluctuation in the tension of the grinding tapes 4a, 4b and, therefore, the small and uniform fine grooves are formed.

68. 发明专利

JPH03295086A MAGNETIC DISK DEVICE AND MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH03295086A
公开(公告)日：1991-12-26
申请号：JP9644890
申请日：1990-04-13
申请人： HITACHI LTD
发明人： GOMI KENICHI , TANAKA HIDEAKI , SAWAHATA SHOICHI , OURA MASAKI , MIYAKE YOSHIHIKO , KATO YOSHIKI , UTA KATSUO
IPC分类号： G11B5/82 , C09D5/23 , C09D7/12 , G11B5/64 , G11B5/65 , G11B5/73 , G11B5/738 , G11B21/21 , G11B25/04
摘要： PURPOSE:To maintain the floating stability of a magnetic head over a long period by making a part surrounded by plural slots to be flat substantially, selecting a ratio of integrated area of projections in projection regions to be a specific range and selecting the height of the projections to be within a prescribed height. CONSTITUTION:Plural continuous or discontinuous slots are provided on the surface of a disk 14 and parts surrounded by the slots are formed substantially flat. Then a ratio of integrated area of projections 7 in the unit of area in projection regions is selected to be 0.5% or over and 90% or below, and the height of the projections is selected to be almost same within a range higher than 5nm and lower than 40nm. Moreover, the magnetic disk 14 and the magnetic head are opposite to each other during rotation at a minute gap of 0.01 - 0.2mum and supported by a slider. Then the floating quantity of the head is selected to be 0.15mum or below to make the recording density of the magnetic disk 14 high.

69. 发明专利

JPH03268201A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH03268201A
公开(公告)日：1991-11-28
申请号：JP32187690
申请日：1990-11-26
申请人： HITACHI LTD
发明人： HIGUCHI SHINSUKE , KITAZAWA CHOSHIRO , MITSUYOSHI TADAHIKO , OURA MASAKI , NAGAIKE SADAKUNI
IPC分类号： G11B5/708 , C09D5/23 , C09D161/04 , C09D161/06 , C10M103/06 , C10N10/08 , C10N40/18 , G11B5/02 , G11B5/60 , G11B5/82
摘要： PURPOSE:To upgrade the durability to wear and to prolong the life of a magnetic disk by using the sintered body of ZrO2 which imparts a lubricative effect on a head slider and incorporating Al2O3 particles having a high hardness into the magnetic disk. CONSTITUTION:The ZrO2 added with C is calcined as the base material of a slider material. The calcination is executed at >=1,650 deg.C and

70. 发明专利

JPH03105721A MAGNETIC RECORDING MEDIUM, ITS PRODUCTION AND PRODUCTION MACHINE OF MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH03105721A
公开(公告)日：1991-05-02
申请号：JP24223389
申请日：1989-09-20
申请人： HITACHI LTD
发明人： INOUE YOICHI , TANAKA KATSUYUKI , OURA MASAKI
IPC分类号： G11B5/72 , G11B5/64 , G11B5/65 , G11B5/66 , G11B5/73 , G11B5/738 , G11B5/84
摘要： PURPOSE:To improve weather resistance and electromagnetic conversion characteristics of a medium by implanting specific kinds of ions into a magnetic thin film and protective film to form an ion implantation layer. CONSTITUTION:On an Al substrate 1, there are successively formed a NiP- plating base film 2, Cr intermediate film 3, Co-Cr magnetic film 4 and further carbon protective film 5 by sputtering. The ion implantation layer 6 is formed to overlap the magnetic thin film. Namely, the recording medium having the ferromagnetic metal layer and protective film 5 formed thereon is subjected to implantation of nonmetal ions such as N, Ar, B, P, Si, etc., or metallic ions of Ti, Zr, Nb, Ta, Cr, Mo, W, etc., in groups IV, V, VI of the periodic table. Thereby, the obtd. medium has improved environmental resistance and long life.

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