专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JPH09320140A MULTILAYER MAGNETOOPTICAL DISK RECORDING/REPRODUCING METHOD 失效
公开(公告)号：JPH09320140A
公开(公告)日：1997-12-12
申请号：JP14134396
申请日：1996-06-04
申请人： HITACHI LTD , HITACHI MAXELL
发明人： MIYAMURA YOSHINORI , KIRINO FUMIYOSHI
IPC分类号： G11B11/10 , G11B11/105
摘要： PROBLEM TO BE SOLVED: To obtain a multivalue regenerative signal and to enable overwriting simple by making a recording film a multilayered structure, irradiating laser light of a fixed intensity at a recording time, recording while changing the intensity of an external applied magnetic field and obtaining a stepwise regenerative signal level. SOLUTION: The film 13 piling up magentooptical recording films is stuck to a surface of an irregular pattern 12 of a substrate 11, and a magnetooptical disk is constituted. In this magnetooptical disk, light is reflected by e.g. a third layer, and a Kerr hysteresis loop is provided. Then, the laser light 31 is converged on the recording film 13 from the side on which the recording film does not exist of the substrate 11, and the recording film 13 is heated. Simultaneously, the magnetic field is applied by a magnetic head 32, to a nearly the some place from the recording film 13 side, and the magnetization of the magnetooptical film 1 is made inverted, and the information is recorded. Then, the external applied magnetic field is increased and by recording on the recording film, the new information is overwritten while erasing the information on the recording film.

2. 发明专利

JPH07334872A OPTICAL MASTER DISK AND ITS PRODUCTION 失效
公开(公告)号：JPH07334872A
公开(公告)日：1995-12-22
申请号：JP12889594
申请日：1994-06-10
申请人： HITACHI LTD , HITACHI MAXELL
发明人： MIYAMURA YOSHINORI , SUGIYAMA HISATAKA , HORIGOME SHINKICHI , ANZAI YUMIKO , SASAKI HISAE
IPC分类号： G11B7/26 , G11B7/0045
摘要： PURPOSE:To make it possible to obtain preformat signals and guide groove signals with good S/N even if a track pitch is made extremely small. CONSTITUTION:Laser beam spot S1 forming prepits such as address pits 21 and laser beam spot S2 forming guide grooves 22 are arranged in parallel in the track width direction on the surface of a photoresist film. The distance between these spots S1 and S2 is set larger than the track pitch Tp.

3. 发明专利

JPH0453045A MAGNETO-OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH0453045A
公开(公告)日：1992-02-20
申请号：JP15978290
申请日：1990-06-20
申请人： HITACHI LTD , HITACHI MAXELL
发明人： KIRINO FUMIYOSHI , TAKAHASHI MASAHIKO , NAKAMURA JUNKO , MIYAMURA YOSHINORI , SUZUKI MAKOTO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To increase coercive force by forming a platinum group-transition metal multilayer film and a rare earth-transition metal film by magnetic exchange coupling and specifying the film thickness ratio of the multilayer film. CONSTITUTION:The recording film has a two-layer structure comprising a rare earth-transistion metal film 3-2 and a platinum group-transition metal multilayer film 3-1 by magnetic exchange coupling. By forming the multilayer film so that the film thickness ratio of the platinum group to the transition metal ranges from 2:1 to 5:1 and the transition metal film is made

4. 发明专利

JPH0447545A STRUCTURE OF MAGNETO-OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH0447545A
公开(公告)日：1992-02-17
申请号：JP15523290
申请日：1990-06-15
申请人： HITACHI LTD , HITACHI MAXELL
发明人： KIRINO FUMIYOSHI , NAKAMURA JUNKO , MIYAMURA YOSHINORI , OTA NORIO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To obtain a large magneto-optical effect by utilizing the multiple interference of light and to allow ultra-high-density optical recording by using films formed with distributions of optical complex indices of refraction in a thin film direction. CONSTITUTION:The multilayered film layers 2 alternately laminated with Pt and Co are formed on a substrate 1 and a Tb27Fe58Co12Nb3 film is formed as a rare earth/transition metal element film 3. The multilayered films 2 alter nately laminated with the Pt and Co of the same constitution as the constitution of the 1st layer are again formed thereon to constitute the magneto-optical recording film. The apparent refractive index is changed by the film thicknesses of the respective layers of the Pt and the Co in this case. The thickness of the Pt near both boundaries of the recording films is increased and the thickness of the Co in the intermediate position is increased. The magneto-optical effect is improved by the multiple interference effect of light within the recording films in this way.

5. 发明专利

JPS6379243A OPTICAL DISK 失效
公开(公告)号：JPS6379243A
公开(公告)日：1988-04-09
申请号：JP22356586
申请日：1986-09-24
申请人： HITACHI LTD , HITACHI MAXELL
发明人： MIYAMURA YOSHINORI , SHIGEMATSU KAZUO , OTA NORIO , KANEKO KATSUHIRO , FUJIMOTO NOBUYUKI , MATSUSHIMA SEIICHI
IPC分类号： G11B7/24 , G11B23/00
摘要： PURPOSE:To increase the adhesive strength of a hub and veneer by fitting a metal made hub to the inner peripheral part of the optical disk veneer sticking a recording film and forming the disk of a contact structure by laminating two sheets with the recording film face at the inner side. CONSTITUTION:An optical disk veneer 2-1 is formed by sticking the recording film varying the physical property by light on the light transmitting substrate having an uneven pattern on the surface. A metal made hub 1-1 is adhered on the inner peripheral part of this veneer 2-1, closely fitted by an adhesive 1-2 so as to laminate two sheets with the recording film face at the inner side and an optical disk 1 is formed. A step difference is provided on the hub 1-1 and since the inner side of the veneer 2-1 and the surface are closely fitted to the hub 1-1 by this step difference part, the adhesive area can be widened. The adhesion of the hub and veneer is thus strengthened and the attachment and detachment of a disk are facilitated because of the inner diameter part being made of a metal.

6. 发明专利

JPH09245377A OPTICAL DISK SUBSTRATE AND ITS MANUFACTURE 失效
公开(公告)号：JPH09245377A
公开(公告)日：1997-09-19
申请号：JP5133196
申请日：1996-03-08
申请人： HITACHI LTD , HITACHI MAXELL
发明人： MIYAMURA YOSHINORI , NAKAO TAKESHI
IPC分类号： G11B7/24 , G11B7/26
摘要： PROBLEM TO BE SOLVED: To eliminate a useless space on an optical disk substrate, to effectively use a substrate surface for recording/reproducing information and to make possible cutting at high speed by plural pieces of vibration exposure. SOLUTION: The substrate is manufactured by continuously irradiating a material with plural pieces of light spots S1, S2 while minutely shifting the spots in the radial direction, and by causing a time difference t between respective spot irradiation start and end times so as to coincide with a light irradiative position of a top spot and exposing. Or, the substrate is manufactured by continuously or pulsatively irradiating a material with plural pieces of light spots S1, S2 while minutely shifting the spots in the circumferential direction, and by minutely vibrating these light spots S1, S2 in the radial direction.

7. 发明专利

JPH0855365A OPTICAL DISK 失效
公开(公告)号：JPH0855365A
公开(公告)日：1996-02-27
申请号：JP19069094
申请日：1994-08-12
申请人： HITACHI LTD , HITACHI MAXELL
发明人： MIYAMURA YOSHINORI , HORIGOME SHINKICHI , SUGIYAMA HISATAKA , SASAKI HISAE
IPC分类号： G11B7/24
摘要： PURPOSE:To obtain a stable reproduced signal by setting the width of a phase pit so that amplitudes of reproducing signals of respective pits become almost equal regardless of the lengths of phase pits in the track direction. CONSTITUTION:A light from an arrgon laser 1 changes a propagating direction by 90 degrees by a total reflection mirror 2 to be divided into two lights whose intensities are almost equal by a translucent mirror 3. A light A reflected from the tranaslucent mirror 3 passes an AO modulator for an intensity modulation 4 and changes the propagating direction at a total reflection mirror 5 to be reflected from a translucent mirror 9. Besides, a light B passing through the translucent mirror 3 is reflected from a total reflection mirror 6 and passes an AO modulator for an intensity modulation 7 and a light deflector 8 driven with a high frequency and passes a translucent mirror 9 to be coalesced with the light A. Thereafter, lights A, B pass on the same optical axis and change a direction at a total reflection mirror 10 and pass a lens 11 to be respectively converged to the spots of about 0-3mum on the surface of a master disk 15 placed in the vicinity of focusses. Electric signals modulated into desired signals are transmitted to AO modulators 4, 7 from a format circuit 19 and the master disk in which prescribed phase pits and guide grooves are recorded is obtained by switching laser beams according to these signals.

8. 发明专利

JPH07287873A OPTICAL DISK SUBSTRATE, MANUFACTURING METHOD THEREFOR AND OPTICAL DISK DEVICE 失效
公开(公告)号：JPH07287873A
公开(公告)日：1995-10-31
申请号：JP8128094
申请日：1994-04-20
申请人： HITACHI LTD , HITACHI MAXELL
发明人： MIYAMURA YOSHINORI , SUGIYAMA HISATAKA , HORIGOME SHINKICHI , ANZAI YUMIKO , SASAKI HISAE
IPC分类号： G11B7/24 , G11B7/26
摘要： PURPOSE:To obtain an excellent transferred pattern by eliminating a narrow region since guide grooves do not exist on both adjacent sides in the radial direction of an irregular pattern. CONSTITUTION:In an optical disk substrate on which a first guide groove 22-1 of an optical disk is formed, an irregular pattern is formed in the radial position different from that of the guide groove on the surface of the substrate and a light reflection film or a recording film is formed on the pattern, the first guide groove 22-1 does not exist on both adjacent sides in the radial direction of the irregular pattern and a second guide groove 22-2 exists on both adjacent sides in the circumferential direction.

9. 发明专利

JPH05314560A MAGNETO-OPTICAL RECORDING MEDIUM AND MAGNETO-OPTICAL RECORDING SYSTEM 失效
公开(公告)号：JPH05314560A
公开(公告)日：1993-11-26
申请号：JP5463091
申请日：1991-03-19
申请人： HITACHI LTD , HITACHI MAXELL
发明人： KIRINO FUMIYOSHI , NAKAMURA JUNKO , SUZUKI MAKOTO , MIYAMURA YOSHINORI , TAKAHASHI MASAHIKO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To enable high-density recording by having recording films consisting of alloy layers which are provided on the side opposite from the side where reproducing light is made incident from multilayered films and have the higher perpendicular magnetic anisotropy-energy than the perpendicular magnetic anisotropy-energy of the multilayered films. CONSTITUTION:The multilayered films alternately laminated with Co as iron family element layers 2 and Pt as noble metal family element layers 3 are produced on a plastic substrate 1. The perpendicular magnetic anisotropy-energy of the recording films produced in such a manner is 1X10 erg/cm in the case of multilayered films of Pt/Co and 1X10 erg/cm in the case of rare earth-iron family element alloy layers consisting of TiFeCoNb. The magneto-optical disk 8 obtd. in such a manner is irradiated with a laser beam 10 via a substrate L and is recorded by using a floating type magnetic head 9 and by switching the direction of the impressed magnetic fields. Very small recording magnetic domains of

10. 发明专利

JPH05101445A SUBSTRATE FOR OPTICAL DISK AND PRODUCTION OF THE SAME 失效
公开(公告)号：JPH05101445A
公开(公告)日：1993-04-23
申请号：JP25822191
申请日：1991-10-07
申请人： HITACHI LTD , HITACHI MAXELL
发明人： ANZAI YUMIKO , ANDO KEIKICHI , MIYAMURA YOSHINORI , HORIGOME SHINKICHI
IPC分类号： G11B7/257 , G11B7/24 , G11B7/26
摘要： PURPOSE:To obtain an optical disk less in noise at the time of recording and reproducing of information and excellent in the characteristic of recording and reproduction of information. CONSTITUTION:The ultraviolet curing resin layer 22, on which ruggedness exhibiting control and retrieval information such as the pit 41 is transferred from a stamper, is formed on one side of a base material and thereafter, heated, softened to smoothen fine ruggedness 42 on the surface of the ultraviolet curing resin layer 22. The optical disk obtained by laminating the recording film is less in noise at the time of the recording and reproduction of the information and has excellent characteristic in recording and reproduction of the information.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式