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61. 发明专利

JP2000067425A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JP2000067425A
公开(公告)日：2000-03-03
申请号：JP23807998
申请日：1998-08-25
申请人： HITACHI LTD
发明人： NEMOTO HIROAKI , TAKAHASHI MASAHIKO , SUKETA YASUSHI , SAGA HIDEKI
IPC分类号： G11B5/66 , G11B5/02 , G11B5/64 , G11B5/65
摘要： PROBLEM TO BE SOLVED: To obtain a recording magnetic film which has good high-density recording characteristics by thermal magnetic recording method and large saturation magnetization at room temp., and therefore, which enables reproduction with high resolution and high output by a magnetic sensor such as an MR head. SOLUTION: At least two layers of magnetic layers including a first magnetic layer 21 having optimized recording characteristics for thermal magnetic recording method and a second magnetic layer 22 having optimized reproducing characteristics by increasing the saturation magnetization at room temp. are used in the medium. These magnetic layers are magnetically exchange-coupled at least at room temp. to constitute a recording film. The magnetic layers are formed such that at the recording temp., the magnetic layer adjacent to the first magnetic layer 21 loses its magnetization and that the recording characteristics of the first magnetic layer are not influenced by the second magnetic layer 22. Thereby, in this magnetic recording medium in which the magnetic layer relating to the recording characteristics and the magnetic layer relating to the reproducing characteristics are separately designed, both of thermal magnetic recording method and reproducing method with a magnetic sensor are possible and a storage system which enables a high-density recording and reproducing by using the advantages of the both methods can be realized.

62. 发明专利

JPH09171647A DEVICE AND METHOD FOR INFORMATION RECORDING AND INFORMATION RECORDING MEDIUM 失效
公开(公告)号：JPH09171647A
公开(公告)日：1997-06-30
申请号：JP34720396
申请日：1996-12-26
申请人： HITACHI LTD
发明人： YONEZAWA SEIJI , OTA NORIO , NIIHARA TOSHIO , KATAOKA KEIJI , TAKAHASHI MASAHIKO , MIYAMOTO JIICHI , SUKETA YASUSHI , TSUYOSHI TOSHIAKI
IPC分类号： G11B11/10 , G11B5/02 , G11B11/105
摘要： PROBLEM TO BE SOLVED: To directly record new data on old data by locally heating an information recording medium by applying laser lights at equal intervals in phase- synchronization with a data channel clock frequency and allowing overlapped writing. SOLUTION: An optical magnetic thin film 21 is formed on disk substrate 22 and the light of a laser 23 forms a light spot 25 on the optical magnetic thin film 21 by a lens 24. The laser 23 is driven by a laser driving circuit 26. On the other hand, for a magnetic coil 27, the polarity of a magnetic field is controlled based on code data from a data generating circuit 37. An embedded clock signal 8 is obtained from the signal 34 of a light detector 29 by an embedded clock extracting circuit 35, a data channel clock 9 is generated by a PLL circuit 36 and the data generating circuit 31 and the laser driving circuit 26 are controlled. The laser 23 is light-modulated by the laser driving circuit 26, emits light pulses in a continuous manner and thus the thin film 21 is locally heated at equal intervals.

63. 发明专利

JPH0963122A OPTICAL INFORMATION MEDIUM HAVING MULTILAYERED STRUCTURE 失效
公开(公告)号：JPH0963122A
公开(公告)日：1997-03-07
申请号：JP21567695
申请日：1995-08-24
申请人： HITACHI LTD
发明人： NISHIDA TETSUYA , ANZAI YUMIKO , ITOU AKITOMO , TSUNODA YOSHITO , TAKAHASHI MASAHIKO
IPC分类号： G11B7/24 , G11B3/00 , G11B11/10 , G11B11/105
摘要： PROBLEM TO BE SOLVED: To make it possible to inexpensively produce the above optical information medium and to increase its capacity by adopting a structure formed by sticking optical information media respectively having >=2 to =2 to =30 to

64. 发明专利

JPH08297861A MULTILAYERED STRUCTURAL OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH08297861A
公开(公告)日：1996-11-12
申请号：JP10358095
申请日：1995-04-27
申请人： HITACHI LTD
发明人： NISHIDA TETSUYA , ANZAI YUMIKO , ITOU AKITOMO , TSUNODA YOSHITO , TAKAHASHI MASAHIKO
IPC分类号： G11B7/24
摘要： PURPOSE: To obtain a large capacity of an optical recording medium. CONSTITUTION: A 1st reproduction only layer 2, a reflection film 3 of Al, an ultraviolet setting resin layer 4, a rewritable layer 5 composed of a phase conversion medium and a protective layer 6 are formed on a 1st substrate made of polycarbonate. On the other hand, a 2nd reproduction only layer 8, a reflection layer 9 of Al, an ultraviolet setting resin layer 10, a rewritable layer 11 composed of a phase conversion medium and a protective layer 12 are also formed on a 2nd substrate 7 made of polycarbonate and the two substrates are laminated with an adhesive layer 13 so that the recording layers face each other. As a result, the large capacity optical recording medium formed at a low cost and having sufficient recording and reproducing characteristics obtained.

65. 发明专利

JPH06187679A MAGNETO-OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH06187679A
公开(公告)日：1994-07-08
申请号：JP33998592
申请日：1992-12-21
申请人： HITACHI LTD
发明人： NAKAMURA JUNKO , MIYAMOTO JIICHI , AWANO HIROYUKI , TAKAHASHI MASAHIKO , NIIHARA TOSHIO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To form a high performance optical recording film having excellent repeated rewriting characteristics and corresponding to short wavelength. CONSTITUTION:In an optical recording medium with a Pt-Co multilayered film 3, a heat diffusing film 4 of at least one among Au, Ag, Cu and Al is formed in contact with the Pt/Co multilayered film 3. The thickness of the heat diffusing film 4 is regulated so that the film 4 transmits light and the pref. thickness is

66. 发明专利

JPH01311440A MAGNETO-OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH01311440A
公开(公告)日：1989-12-15
申请号：JP13939188
申请日：1988-06-08
申请人： HITACHI LTD
发明人： MAEDA TAKESHI , OTA NORIO , SUZUKI YOSHIO , TAKAHASHI MASAHIKO
IPC分类号： G11B5/02 , G11B11/10 , G11B11/105 , G11B20/14 , G11B27/24
摘要： PURPOSE:To perform overwrite at high speed by irradiating a part where a recording magnetic domain is formed by pulse light with large energy and the part where no recording magnetic domain is formed by the pulse light with small energy, and detecting deviation between a recorded magnetic domain and timing information. CONSTITUTION:A pulse with laser output of 15mw and pulse width of 50nsec as a long pulse and the pulse with pulse output of 15mw and pulse width of 20nsec as a short pulse are prepared based on the fact that the recording magnetic domain remains after the irradiation of long pulse light and to recording magnetic domain remains after the irradiation of short pulse light. Data recording on a disk 1 is performed by controlling the laser power and the pulse width of a semiconductor laser 3 by a laser driving circuit 4. Next, a signal is read out from the magnetic domain on which a recording timing deviation detecting pattern 33 is formed just before performing the overwrite, and the deviation of a recording timing is detected by a phase deviation detection circuit 51. The deviation is inputted to a quantity storage circuit 52, and a recording correction circuit 28 is controlled by the output of a correction quantity arithmetic circuit 53, then, a clock 29 for recording data is generated. In such a way, it is possible to realize the overwrite accurately.

67. 发明专利

JPH01292603A MAGNETO-OPTICAL DATA RECORDING DEVICE 失效
公开(公告)号：JPH01292603A
公开(公告)日：1989-11-24
申请号：JP12173488
申请日：1988-05-20
申请人： HITACHI LTD
发明人： YONEZAWA SEIJI , OTA NORIO , NIIHARA TOSHIO , KATAOKA KEIJI , TAKAHASHI MASAHIKO , MIYAMOTO JIICHI , SUKETA YASUSHI , TSUYOSHI TOSHIAKI
IPC分类号： G11B20/10 , G11B5/02 , G11B7/006 , G11B7/007 , G11B11/10 , G11B11/105 , G11B27/19 , G11B27/30
摘要： PURPOSE:To overwrite optical code data on a magnetic domain whose shape is not of half-moon shape by modulating laser light and a magnetic field as synchronizing them with a data clock signal, and changing the polarity of the magnetic domain according to the code data while a disk is heated locally by the laser light. CONSTITUTION:An embedded clock bit is formed previously on the disk 22 on which a magneto-optical thin film 21 is formed. The laser light from a laser 23 irradiates the disk 22, and the clock signal 9 obtained from the signal 34 of a photodetector 29 by an embedded clock extraction circuit 35 and a PLL circuit 36 is led to a data generation circuit 37 and a laser drive circuit 26 so as to control the laser 23. Thus, the laser 23 is light-modulated as synchronizing with the clock signal 9, and emits continuous pulse light, and heats the thin film 21 of the disk 22 locally at equal intervals. Simultaneously with it, the new code data is sent from the data generation circuit 37 to a magnetic coil 27 as synchronizing with the clock signal 9, and the new magnetic domain is formed, and the new code data is overwritten.

68. 发明专利

JPS6226658A PHOTOMAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS6226658A
公开(公告)日：1987-02-04
申请号：JP16413285
申请日：1985-07-26
申请人： HITACHI LTD
发明人： OOTA NORIO , SUGITA KEN , HORIGOME SHINKICHI , NIIHARA TOSHIO , KANEKO KATSUHIRO , OKAMINE SHIGENORI , TAKAHASHI MASAHIKO , SUDO RYOICHI , MIWA HIROAKI , TAJIMA TETSUO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To improve recording and reproducing characteristics by providing a protective film on both or one side of a magnetic film for magnetic recording having the axis of easy magnetization in the direction perpendicular to the film plane. CONSTITUTION:A mold plate 2 inscribed with rugged information patterns 1 is formed to a pan-shape into which liquid can be poured. A liquid photosetting resin 3 is poured into such mold plate. A releasable transparent plate 4 as a top cap is put on the photosetting resin 3 and thereafter an energy beam such a UV rays is irradiated from at least either direction of the plate 2 or the cap 4 to cure the resin 3, by which the substrate having the information patterns is obtd. The 1st transparent dielectric film 6 consisting of, for example, SiO2, ZnS, etc. is formed on the substrate 5 for a photomagnetic disk obtd. in such a manner and further an amorphous rate earth transition metallic layer 7 as a photomagnetic recording layer is formed on the layer 6; finally a dielectric layer prepd. by a sputtering or vapor deposition method as a layer 8 to protect the magnetic layer 7 from the outside is deposited thereon. The recording and reproducing characteristics of the photomagnetic recording are thereby improved.

69. 发明专利

JPS61214262A PHOTOMAGNETIC DISC 失效
公开(公告)号：JPS61214262A
公开(公告)日：1986-09-24
申请号：JP5443985
申请日：1985-03-20
申请人： HITACHI LTD
发明人： NIIHARA TOSHIO , KANEKO KATSUHIRO , TAKAYAMA SHINJI , SUGITA KEN , TAKAHASHI MASAHIKO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To prevent the generation of cracks in a UV curing resin layer by providing an SiO film between a thin amorphous film consisting of a recording material which is a rare earth-transition metal and the UV curing resin layer. CONSTITUTION:An interference film 3 consisting of four kinds of SiO, ZnS, AlN and Si3N4, the thin amorphous film 4 and a protective film 5 are successively laminated by a sputtering method on the UV curing resin layer 2. The internal stress of the AlN and Si3N4 films is large and the resin layer 2 is cracked if the AlN and Si3N4 are used for the tilm 3. The extremely early decreased Kerr rotating angle is then resulted. The layer 2 is not cracked but the protective effect by the ZnS is not enough and the Kerr rotating angle decreases gradually if the ZnS is used for the film 3. The Kerr rotating angle does not change at all even after the lapse of a long period and the resin layer 2 is crack-free; in addition the stability of the SiO film itself is maintained if the SiO is used for the film 3.

70. 发明专利

JPS61214254A PHOTOMAGNETIC RECORDING MATERIAL 失效
公开(公告)号：JPS61214254A
公开(公告)日：1986-09-24
申请号：JP5442285
申请日：1985-03-20
申请人： HITACHI LTD
发明人： TAKAYAMA SHINJI , NIIHARA TOSHIO , KANEKO KATSUHIRO , TAKAHASHI MASAHIKO , SUGITA KEN
IPC分类号： H01F10/14 , C22C38/00 , C22C45/02 , G11B11/10 , G11B11/105 , H01F10/12 , H01F10/13
摘要： PURPOSE:To realize an amorphous vertically magnetizable film of which the characteristics are less deteriorated and which has a long life by incorporating at least one kind of Er, Ho, Nb and W at >=0.5atomic% into said film. CONSTITUTION:The thermal stability is higher ad the better result is obtd. as the crystallization temp. Tx of the amorphous alloy film is higher. The power of laser light is made lower as the Curie temp. Tc is lower. The elements, Er, Ho, Nb, W having the large difference between the crystallization temp. Tx and the Curie temp. Tc are thereupon selected and are added into the amorphous Tb-Fe-Co alloy film in a 0.5-10atomic% range. The C/N ratio of the recording surface formed in the above-mentioned manner does not change even after 10 times of tests as compared with 10 times with the conventional material and therefore the recording film of which the characteristics are less deteriorated and which has the long life is obtd.

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