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1. 发明专利

DE68928712T2 未知
公开(公告)号：DE68928712T2
公开(公告)日：1998-10-15
申请号：DE68928712
申请日：1989-11-06
申请人： HITACHI MAXELL , HITACHI LTD
发明人： KIRINO FUMIYOSHI SANIKOPO TAKA , MIYAMOTO HARUKAZU , OKAMINE SHIGENORI , OGIHARA NORIYUKI , TAKAHASHI MASAHIKO , OHTA NORIO , NIIHARA TOSHIO
IPC分类号： G11B11/105 , G11B11/10
摘要： In a magneto-optical disk for recording, reproduction or erasing with a laser beam, which comprises a film of four-layer structure consisting of a first dielectric layer (2), a magneto-optical recording layer (3), a second dielectric layer (4) and a metallic layer (5), laid on a disk substrate (1) provided with guide tracks, temperature distribution of the magneto-optical recording layer (3) is controlled by controlling the thermal diffusivity of the metallic layer (5), and recording/reproduction/erasing repetition characteristics are improved thereby. In the disk of the present structure, the temperature is elevated in a broader area from the center of laser beam, and thus a thoroughly broad erasing domain width taking a track offset into account can be obtained and not recording domains remain after the erasing. The reproduced signal output is increased by 4 dB, as compared with that obtained by a disk of three-layer structure without any metallic layer, because the beam utilization efficiency is increased owing to both Kerr effect and Faraday effect. When the disk of the present structure is subjected to field modulation recording, tails of arrow-feather-shaped recording domains peculiar to the field modulation recording can be shortened and interbit interferences can be overcome, resulting in an increase in C/N (S/N) ratio and the high density recording can be made. By endowing a Kerr enhancement action to the second dielectric layer (4) and a protective action on the magneto-optical layer (3) to the first dielectric layer (2), only the reliability can be improved without lowering the C/N ratio. By improving the corrosion resistance of the magneto-optical recording layer, the first dielectric layer (2) can be omitted to the contrary, and a magneto-optical disk of simple structure can be obtained and used as memory for domestic applications or communication fields.

2. 发明专利

DE69026042D1 未知
公开(公告)号：DE69026042D1
公开(公告)日：1996-04-25
申请号：DE69026042
申请日：1990-12-11
申请人： HITACHI MAXELL , HITACHI LTD
发明人： OKAMINE SHIGENORI , NISHIDA TETSUYA , HORIGOME SHINKICHI , TERAO MOTOYASU , OHTA NORIO
IPC分类号： G11B7/00 , G11B7/004 , G11B7/0045 , G11B7/24

3. 发明专利

DE4115321A1 Information recording layer 未知
公开(公告)号：DE4115321A1
公开(公告)日：1991-11-28
申请号：DE4115321
申请日：1991-05-10
申请人： HITACHI MAXELL , HITACHI LTD
发明人： TERAO MOTOYASU , ANDOO KEIKICHI , MIYAUCHI YASUSHI , OKAMINE SHIGENORI , TAMURA REIJI , TAKAHASHI MASAHIKO , FUTAMOTO MASAAKI
IPC分类号： G11B7/243 , G11B7/253 , G11B7/257 , G11B7/2578 , G11B7/26
摘要： An information recording layer, esp. for rewritable information carriers, which undergoes a property change on incidence of a recording beam of sufficient energy, has irregularities (pref. periodic peaks and valleys) at one or both sides to suppress flow, caused by the property change, and/or to reduce thermal conductivity. Also claimed are (i) an information recording material having one or more recording layers as described above; and (ii) processes for prodn. of the above recording layer or recording material.

4. 发明专利

DE69026042T2 未知
公开(公告)号：DE69026042T2
公开(公告)日：1996-08-22
申请号：DE69026042
申请日：1990-12-11
申请人： HITACHI MAXELL , HITACHI LTD
发明人： OKAMINE SHIGENORI , NISHIDA TETSUYA , HORIGOME SHINKICHI , TERAO MOTOYASU , OHTA NORIO
IPC分类号： G11B7/00 , G11B7/004 , G11B7/0045 , G11B7/24

5. 发明专利

DE68928712D1 未知
公开(公告)号：DE68928712D1
公开(公告)日：1998-07-23
申请号：DE68928712
申请日：1989-11-06
申请人： HITACHI MAXELL , HITACHI LTD
发明人： KIRINO FUMIYOSHI , MIYAMOTO HARUKAZU , OKAMINE SHIGENORI , OGIHARA NORIYUKI , TAKAHASHI MASAHIKO , OHTA NORIO , NIIHARA TOSHIO
IPC分类号： G11B11/105 , G11B11/10
摘要： In a magneto-optical disk for recording, reproduction or erasing with a laser beam, which comprises a film of four-layer structure consisting of a first dielectric layer (2), a magneto-optical recording layer (3), a second dielectric layer (4) and a metallic layer (5), laid on a disk substrate (1) provided with guide tracks, temperature distribution of the magneto-optical recording layer (3) is controlled by controlling the thermal diffusivity of the metallic layer (5), and recording/reproduction/erasing repetition characteristics are improved thereby. In the disk of the present structure, the temperature is elevated in a broader area from the center of laser beam, and thus a thoroughly broad erasing domain width taking a track offset into account can be obtained and not recording domains remain after the erasing. The reproduced signal output is increased by 4 dB, as compared with that obtained by a disk of three-layer structure without any metallic layer, because the beam utilization efficiency is increased owing to both Kerr effect and Faraday effect. When the disk of the present structure is subjected to field modulation recording, tails of arrow-feather-shaped recording domains peculiar to the field modulation recording can be shortened and interbit interferences can be overcome, resulting in an increase in C/N (S/N) ratio and the high density recording can be made. By endowing a Kerr enhancement action to the second dielectric layer (4) and a protective action on the magneto-optical layer (3) to the first dielectric layer (2), only the reliability can be improved without lowering the C/N ratio. By improving the corrosion resistance of the magneto-optical recording layer, the first dielectric layer (2) can be omitted to the contrary, and a magneto-optical disk of simple structure can be obtained and used as memory for domestic applications or communication fields.

6. 发明专利

DE4115321C2 未知
公开(公告)号：DE4115321C2
公开(公告)日：1995-06-01
申请号：DE4115321
申请日：1991-05-10
申请人： HITACHI LTD , HITACHI MAXELL
发明人： TERAO MOTOYASU , ANDOO KEIKICHI , MIYAUCHI YASUSHI , OKAMINE SHIGENORI , TAMURA REIJI , TAKAHASHI MASAHIKO , FUTAMOTO MASAAKI
IPC分类号： G11B7/243 , G11B7/253 , G11B7/257 , G11B7/2578 , G11B7/26 , G11B7/24

7. 发明专利

JPH04325942A THIN FILM FOR INFORMATION RECORDING, INFORMATION RECORDING MEMBER AND PRODUCTION THEREOF 失效
公开(公告)号：JPH04325942A
公开(公告)日：1992-11-16
申请号：JP9681091
申请日：1991-04-26
申请人： HITACHI LTD , HITACHI MAXELL
发明人： OKAMINE SHIGENORI , TERAO MOTOYASU , ANDO KEIKICHI , MIYAUCHI YASUSHI , TAKAHASHI MASAHIKO , TAMURA NORIHITO
IPC分类号： G11B11/105 , G11B7/24 , G11B7/26 , G11B11/10
摘要： PURPOSE:To provide the thin film for information recording which suppresses the flow, heat conduction and spread of magnetic lines of force of the thin film for information recording and the information recording member and the process which can easily produce the above-mentioned thin film and member. CONSTITUTION:The thin film 3 for information recording having at least two pieces of the regions varying in etching rate is formed directly or via a lower protective layer 2 on a substrate. This thin film 3 for information recording is then etched to form ruggedness on the thin film 3 for information recording by utilizing the difference in the etching rate in the respective regions of the thin film 3 for information recording. The flow of the molten thin film for information recording, the conduction of the heat generated in the respective regions and further the spread of the magnetic lines of force are suppressed by the recessed parts formed on the thin film for information recording. Since the desired ruggedness is obtd. simply by etching the thin film for information recording, the production is easy.

8. 发明专利

JPH04186538A INFORMATION RECORDING MEDIUM 失效
公开(公告)号：JPH04186538A
公开(公告)日：1992-07-03
申请号：JP31394990
申请日：1990-11-21
申请人： HITACHI LTD , HITACHI MAXELL
发明人： OKAMINE SHIGENORI , TERAO MOTOYASU , ANDO KEIKICHI , MIYAUCHI YASUSHI
IPC分类号： C23C14/14 , G11B7/24 , G11B7/241
摘要： PURPOSE:To obtain a good recording and replay characteristic even when a rewrite operation is performed many times by a method wherein an Al alloy film layer which is composed of a specific element such as Ag, Cu or the like and of Al is formed so as to come into contact with a protective layer formed so as to be adjacent to a thin film for recording. CONSTITUTION:An Al alloy film layer 6 is formed so as to come into contact with a protective layer 5 which is formed so as to be adjacent to a thin film 4 for information recording use and which is composed of at least one out of an inorganic substance and an organic substance. For the Al alloy film, it is preferable that at least one or more elements selected from Ag, Cu, Ni, Fe, Co, Zn, Ta, Cr, Mn, Mg, Sn and Ti are contained. For the Al alloy film 6, it is preferable that its Al atomic concentration is at 75 to 98% and that its film thickness is at 30 to 300nm. The Al alloy film 6 can be formed easily by a sputtering operation or a vapor deposition operation. Since the flatness of the Al alloy film 6 is good and, at the same time, its close contact property is strong, the metal film is not deformed or stripped.

9. 发明专利

JPS63155447A PRODUCTION OF INFORMATION RECORDING MEDIUM 失效
公开(公告)号：JPS63155447A
公开(公告)日：1988-06-28
申请号：JP30128886
申请日：1986-12-19
申请人： HITACHI LTD , HITACHI MAXELL
发明人： YAMADA YUKINORI , KANEKO KATSUHIRO , NIIHARA TOSHIO , OKAMINE SHIGENORI , OTA NORIO
IPC分类号： G11B7/26 , G11B11/10 , G11B11/105
摘要： PURPOSE:To obtain a good-quality recording layer and to permit recording, reading out and erasing from a protective layer side by using glass or metal as a substrate, laminating the recording layer thereon and finally molding the protective layer by an injecting molding or casting method. CONSTITUTION:The information recording medium is constituted by forming the recording layer on the substrate consisting of the glass or metal 1 and finally forming the protective layer 4 by the injection molding or casting method. Recording from the protective layer 4 side. Since the substrate 1 at the time of preparing the recording layer is of the glass or metal, the good-quality recording layer which obviates the deterioration in the film quality by gas release is obtd. Since transparent plastic and resins are used for the molding of the protective layer and medium, the recording reading out and erasing from the protective layer 4 side are permitted and the efficiency of the prepn. is high.

10. 发明专利

JPS6318546A MAGNETO-OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPS6318546A
公开(公告)日：1988-01-26
申请号：JP16206786
申请日：1986-07-11
申请人： HITACHI LTD , HITACHI MAXELL
发明人： NIIHARA TOSHIO , KANEKO KATSUHIRO , OOTA NORIO , SUZUKI HIROYUKI , YAMADA YUKINORI , OKAMINE SHIGENORI , TAKAHASHI MASAHIKO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To obtain a high-performance magneto-optical recording medium which has a substantially large Kerr rotating angle and particularly large reproduction output at the time of recording and reproducing of information by forming a nitride film made of the compsn. in which the metals or semiconductor elements constituting nitrides are incorporated at the ratio higher than the intrinsic stoichiometrical compsn. ratio even in terms of the nitride. CONSTITUTION:The nitride to constitute the nitride film which is a transparent film to increase the Kerr rotating angle is preferably the nitride of the metal elements such as Al, Ta, Ti and Nb or the nitride of the semiconductor elements such as Si, Ge, Sn, Se, Te, and B. The ratio of the metal or semiconductor elements to be incorporated into said nitrides is preferably in the compsn. range expressed by (MnNm)1-xMx in molar fraction (where M is the metal or semiconductor element, N is nitrogen and MnNm is approximately the stoichiometrical compsn. of the nitride consisting of the metal or semiconductor element, and x denotes a 0

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