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1. 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.

2. 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.

3. 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.

4. 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

5. 发明专利

JPH02152050A MAGNETO-OPTICAL DISK 失效
公开(公告)号：JPH02152050A
公开(公告)日：1990-06-12
申请号：JP30605388
申请日：1988-12-05
申请人： HITACHI LTD , HITACHI MAXELL
发明人： KIRINO FUMIYOSHI , MIYAMOTO JIICHI , OKAMINE SHIGENORI , OGIWARA NORIYUKI , TAKAHASHI MASAHIKO , OTA NORIO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To reduce fluctuation of reproduction output of an optical disk using laser light after recording/reproducing/erasing is repeated by providing a four- layered structure comprising a first dielectric film, magneto-optical recording film, second dielectric film and metal protective film on the disk substrate and controlling the thermal conductivity of the metal protective film. CONSTITUTION:The first dielectric film 2 of silicon nitride is formed on the disk substrate 1 by sputtering, on which the magneto-optical recording film 3 is formed by sputtering. Then the second dielectric film 4 of silicon nitride is formed by sputtering and the metal protective film 5 is formed. The material of the metal protective film is selected from those materials essentially comprising one of Al, Au, Pt, Rh, Pd and Cu to control the thermal conductivity of the film. Further, another element except for intrinsic ones is added or one element selected from Ni, Nb, Ta, Ti, Zr, Co and Mn is added to the protective film by 1-30at.%. The concentration of the added element is controlled to obtain the desired thermal conductivity of the metal protective film 5.

6. 发明专利

JPH02126432A OPTICAL DISK 失效
公开(公告)号：JPH02126432A
公开(公告)日：1990-05-15
申请号：JP27923388
申请日：1988-11-07
申请人： HITACHI LTD , HITACHI MAXELL
发明人： KIRINO FUMIYOSHI , OTA NORIO , TAKAHASHI MASAHIKO , TAMURA HIROHITO , NISHIDA TETSUYA
IPC分类号： G11B7/254 , G11B7/24 , G11B7/241 , G11B7/257
摘要： PURPOSE:To attain control of an optical constant and to improve reliability by providing a film containing an element selected out of an In, an Sb, a Ge, a Ga, an Sn, an Se and a Te in the compound of silicon and nitrogen adjacently to a recording layer. CONSTITUTION:An optical disk is formed by providing a base film 2 and a recording medium 3 on a substrate 1, and furthermore, providing a protection film 4. The film 2 contains at least one kind of element selected out of the In, the Sb, the Ge, the Ga, the Sn, the Se, and the Te in the compound of the silicon and the nitrogen. In such a way, by invading metal or metalloid with a low m.p. in an Si and an N in crystal structure or between crystal particulates, the pin hole density of the film can be reduced, and furthermore, by changing a ratio of the element to be attached to the Si and the N, thermal conductivity and a refractive index can be controlled. In such a way, it is possible to obtain the optical disk with high reliability by freely selecting the recording sensitivity of the disk and improving performance.

7. 发明专利

JPS63281247A MAGNETO-OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPS63281247A
公开(公告)日：1988-11-17
申请号：JP11469387
申请日：1987-05-13
申请人： HITACHI LTD , HITACHI MAXELL
发明人： NIIHARA TOSHIO , KANEKO KATSUHIRO , GOTO NORIO , SUZUKI HIROYUKI , YAMADA YUKINORI , OKAMINE SHIGENORI , TAKAHASHI MASAHIKO , OTA NORIO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To improve the characteristics of a laminated magnetic layer and to increase the angle of Kerr rotation thereof by providing mixed films formed by mixing elements which easily form oxide dielectrics with SiO. CONSTITUTION:The elements, such as Si, Ti, Ta, Nb, Al, and Mg, which are liable to form the oxide dielectrics are added into the SiO film. Namely, the elements such as Si, Ti, Ta, Al, and Mg added into the SiO film capture the excess oxygen and free oxygen existing in the SiO film and prevent the reaction of said oxygen with the magnetic films. The impairment of the characteristics of the magnetic films are, therefore, obviated. The refractive index of the SiO film is decreased by the presence of the excess oxygen, free oxygen, etc., but these elements have the refractive indices larger than the refractive index of the SiO film and, therefore, the decrease in the refractive index, i.e., the decrease in the angle of Kerr rotation is prevented.

8. 发明专利

JPS62183048A PRODUCTION OF PHOTOMAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS62183048A
公开(公告)日：1987-08-11
申请号：JP2368686
申请日：1986-01-07
申请人： HITACHI LTD , HITACHI MAXELL
发明人： NIIHARA TOSHIO , KANEKO KATSUHIRO , OKAMINE SHIGENORI , OOTA NORIO , TAKAHASHI MASAHIKO , SUGITA KEN , YAMADA YUKINORI
IPC分类号： G11B11/10 , C12P41/00 , G11B11/105
摘要： PURPOSE:To obtain the titled recording medium having excellent recording/ reproducing characteristics by forming a thin dielectric film in an atmosphere contg. gaseous hydrogen by a physical vapor deposition method. CONSTITUTION:An SiO2 interference film 3 is formed to 1,000Angstrom thickness by using gaseous Ar contg. 20vol% gaseous hydrogen by a high-frequency magnetron sputtering method on a layer 2 of a UV-curing resin provided on a glass disk 1. A thin amorphous magnetic film 4 consisting of Tb27Fe68Co5 is then formed to 1,000Angstrom thickness under the gaseous Ar and further a protective film consisting of SiO2 is laminated thereon to 700Angstrom thickness under the gaseous Ar. The photomagnetic recording medium obtd. in such a manner has about 0.6 deg. Kerr rotating angle measured from the substrate 1 side at 830nm wavelength of polarized light. The Kerr rotating angle is substantially increased by mixing 20vol% gaseous hydrogen with the gaseous Ar.

9. 发明专利

JPH11339336A MAGNETO-OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH11339336A
公开(公告)日：1999-12-10
申请号：JP14083698
申请日：1998-05-22
申请人： HITACHI LTD , HITACHI MAXELL
发明人： NEMOTO HIROAKI , SUKETA YASUSHI , TAKAHASHI MASAHIKO
IPC分类号： G11B11/10
摘要： PROBLEM TO BE SOLVED: To obtain the magneto-optical recording film having a good recording characteristic while maintaining a high output by a reproducing magnetic layer. SOLUTION: Right at the Curie temperature of a recording magnetic layer, in which a recording magnetic domain shape is determined, the range of the saturated magnetization of a reproducing magnetic layer is limited from 30 emu/cm to 10 emu/cm . Moreover, the magnetization direction of the layer is set to the same direction of the magnetization direction of a recording magnetic layer while they are exchange coupled. The magnetic wall expanding force caused by stabilizing magneto-static energy against the contracting force of the magnetic wall, that appears in the reproducing magnetic layer, is balanced and a recording is conducted similar to the single layer of the recording magnetic layer.

10. 发明专利

JPH0233748A RECORDING AND ERASING METHOD FOR MAGNETO-OPTICAL DISK 失效
公开(公告)号：JPH0233748A
公开(公告)日：1990-02-02
申请号：JP18182488
申请日：1988-07-22
申请人： HITACHI LTD , HITACHI MAXELL
发明人： KIRINO FUMIYOSHI , OGIWARA NORIYUKI , TAKAHASHI MASAHIKO , OKAMINE SHIGENORI , OTA NORIO
IPC分类号： G11B11/10 , G11B5/02 , G11B7/00 , G11B7/0045 , G11B7/0055 , G11B7/125 , G11B11/105
摘要： PURPOSE:To suppress the lowering of a reproducing output and to improve the reliability of a disk by suiting a laser output at the time of recording or erasing in order to control the temperature distribution of a recording film. CONSTITUTION:In a magneto-optical disk to have a magneto-optical recording film which has vertical magnetic anisotropy, at least, on a substrate, the laser output is changed at the time of the recording and erasing and the respective laser outputs are made suitable in order to control the temperature distribution of the recording film. Then, the laser output for the erasing is caused to be >=the same value as that of the laser output for the recording. Further, the temperature distribution is controlled in correspondence to the structure of the optical disk.

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