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91. 发明专利

JPH0570924B2 失效
公开(公告)号：JPH0570924B2
公开(公告)日：1993-10-06
申请号：JP8089383
申请日：1983-05-11
申请人： HITACHI LTD
发明人： NIIHARA TOSHIO , FUJIWARA HIDEO , TAKAYAMA SHINJI
IPC分类号： H01F10/12 , C22C45/04 , G03G5/16 , G11B11/10 , G11B11/105 , G11C13/06 , H01F10/13 , H01F10/16 , H01F41/18 , G11B5/62

92. 发明专利

JPH04205938A OPTICAL RECORDING METHOD 失效
公开(公告)号：JPH04205938A
公开(公告)日：1992-07-28
申请号：JP33710690
申请日：1990-11-30
申请人： HITACHI LTD
发明人： KATO KEIZO , MIYAMOTO JIICHI , KAWAMURA TETSUSHI , OSHIMA MASAHIRO , TERAO MOTOYASU , MIYAUCHI YASUSHI , KAKU TOSHIMITSU , YAMANE YUJI , FUKUDA YASUSHI , KOMATSU HITOSHI , NIIHARA TOSHIO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To allow recording with the same power even if the linear speed at the point on a track increases from the inner periphery to the outer periphery of a disk by continuously increasing or decreasing the film thickness of any of a light incident side protective layer, recording film and reflection side protective layer from the inner periphery to the outer periphery. CONSTITUTION:For example, a reflection film 11 of an information recording medium is formed to the thickness increasing from the outer periphery of a substrate 9 toward the inner peripheral direction. There is a relation of the successive increase in the film thickness and the successive decrease in the transmittance between the film thickness and transmittance of the reflection film 11. Then, the transmittance of the reflection film 11 is lower on the inner periphery than on the outer periphery when this film is formed thicker from the inner periphery to the outer periphery of the substrate 9 and, therefore, the laser beam 13 transmitted through the reflection film 11 has the smaller laser power as the radius R of the substrate 9 is smaller. The reflection film 11 is formed to such film thickness as to optimize the laser power at respective radii in such a manner, by which the recording and reproducing of information are executed at the optimum power even if the laser power over the entire surface from the inner periphery to the outer periphery.

93. 发明专利

JPH02281443A NON MAGNETIC FIELD OVERWRITING DEVICE FOR MAGNETO-OPTICAL RECORDING 失效
公开(公告)号：JPH02281443A
公开(公告)日：1990-11-19
申请号：JP10012289
申请日：1989-04-21
申请人： HITACHI LTD
发明人： MIYAMOTO JIICHI , SUZUKI YOSHIO , NIIHARA TOSHIO , OTA NORIO , TAKAHASHI MASAHIKO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To simplify the constitution of a device and to miniaturized it and to speed up its operation, and to eliminate a failure in erasure essentially and to improve the quality and reliability by forming an inverted magnetic domain which is smaller than a light spot by laser beam irradiation, and moving the position of the inverted magnetic domain in the area of the light spot and recording data. CONSTITUTION:For example, the device is constituted of a recording medium 8, lenses 9a - 9d, a beam splitter 10, a polarizer 11, a 1/2-wavelength plate 12, a laser 13, and detectors 14a and 14b. Then the inverted magnetic domain which is smaller than the light spot is formed by the laser beam irradiation and the position of the inverted magnetic domain is moved in the area of the light spot to record the data. Consequently, new information can be overwritten only by controlling the intensity, etc., of laser beam without providing any special bias magnetic field applying means to invert a magnetic field. Consequently, there is no failure in erasure and data transfer in recording is speeded up; and the constitution of the device is simplified and the size and cost of the device are reduced.

94. 发明专利

JPH02278540A STRUCTURE FOR MAGNETO-OPTICAL DISK 失效
公开(公告)号：JPH02278540A
公开(公告)日：1990-11-14
申请号：JP9731489
申请日：1989-04-19
申请人： HITACHI LTD
发明人： OTA NORIO , KIRINO FUMIYOSHI , TERAO MOTOYASU , ANDO KEIKICHI , MIYAMOTO JIICHI , NIIHARA TOSHIO , OSHIMA MASAHIRO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To increase the floating distance of a magnetic head, to prevent head crush and to improve function by inserting the thin type magnetic head into air flowing the symmetric laminar flow of a hollow part between two united magneto-optical disks. CONSTITUTION:Two single body disks 2, for which a recording medium is respectively formed in one side surface, are assembled so that the hollow part can be generated in an interval between these mutually faced media. A hole 3 is provided in one part of a spacer 7 in a rotary center part and when the disk is rotated, the stable air current is made in the hollow part. Then, an inserted magnetic disk 4 floats up to a center. Thus, the storing capacity of the disk using a magnetic field modulating recording system, with which overwriting can be executed, is made double. Then, since sliders are provided in the both sides of the head 4 and the external surfaces of the two disks 2 are irradiated with laser beam 6 at satisfactory timing, recording can be distributed and the transfer speed of data is improved. Further, an error caused by corrosion, etc., is prevented.

95. 发明专利

JPH01130344A MAGNETO-OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH01130344A
公开(公告)日：1989-05-23
申请号：JP28738987
申请日：1987-11-16
申请人： HITACHI LTD
发明人： NIIHARA TOSHIO , OTA NORIO , OKAMINE SHIGENORI
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To improve the magnetical squareness of magnetic films without subjecting the films to a heating treatment and to decrease modulation type noises by providing multi-layered magnetic films laminated with specific 1st and 2nd magnetic layers. CONSTITUTION:This recording medium is constituted by having the multi-layered magnetic films laminated with the 1st magnetic layer consisting of rare earth elements contg. at least one kind of light rare earth element selected from a group consisting of neodium (Nd) and praseodymium (Pr) and transition metal elements and the 2nd magnetic layer 4 consisting of the heavy rare earth elements and the transition metal elements on a substrate 1. The formation of the magnetic layers improved in the magnetical squareness at room temp. is thereby enabled and the modulation noises are improved; in addition, the performance of the magneto-optical recording medium is improved.

96. 发明专利

JPS63291236A MAGNETO-OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPS63291236A
公开(公告)日：1988-11-29
申请号：JP12380587
申请日：1987-05-22
申请人： HITACHI LTD
发明人： NIIHARA TOSHIO , SHIGA AKIO , SUZUKI YOSHIO , KIRINO FUMIYOSHI , TAKAYAMA SHINJI , OTA NORIO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To suppress corrosion reaction which is pitting and oxidation from the outside circumferential part of a medium by providing a passive state forming metallic film to the outside circumferential part of the recording medium. CONSTITUTION:The film of the passive state forming metal such as Nb, Ti, Ta or Cr is formed to the outside circumferential part of the recording medium. The passive state metallic film formed in such a manner greatly suppresses the diffusion of the corrosive factors such as oxygen and moisture entering from the outside. The recording medium is thereby protected against corrosion and the life thereof is prolonged. This outside circumferential passive state film exerts no undesirable influence at all to the magnetic characteristics of the medium.

97. 发明专利

JPS6180637A Manufacture of photomagnetic recording medium 失效
标题翻译：光电记录介质的制造
公开(公告)号：JPS6180637A
公开(公告)日：1986-04-24
申请号：JP20166384
申请日：1984-09-28
申请人： Hitachi Ltd
发明人： NIIHARA TOSHIO , SUGITA KEN , TAKAYAMA SHINJI , KANEKO KATSUHIRO
IPC分类号： G11B11/10 , G11B5/84 , G11B11/105
CPC分类号： G11B11/105
摘要： PURPOSE:To stabilize the vertical magnetic anisotropy by heat-treating the recording medium. CONSTITUTION:A photoelectromagnetic medium is manufactured, for example, by laminating an Si3N4 film 2, a Tb-Fe film 3 (composed in 25:75:5atm%), and the Si3N4 film 2 successively on a glass substrate 1 each in 1,000 Angstrom thickness by sputtering. The heat treatment of the recording medium can be carried out after a magnetic thin film is formed or after the laminated films of a protective film (SiO2, Si3N4, etc.) and a reflective film (Al, Cu, etc.) are formed. Although the heat treatment can be carried out in the atmosphere, the treatment is preferably carried out in an inert gas (N2, Ar, He, etc.) or in vacuum to control the deterioration of the characteristic due to oxidation to a minimum. Although the heat treating temp. depends on the characteristic of the magnetic thin film, the treatment is preferably conducted in the temp. range 100-500 deg.C.
摘要翻译：目的：通过对记录介质进行热处理来稳定垂直磁各向异性。构成：例如可以通过在玻璃基板1上依次层压在1000埃以上的Si 3 N 4膜2，Tb-Fe膜3（25:75:5原子％构成）和Si 3 N 4膜2而制造光电介质厚度。记录介质的热处理可以在形成磁性薄膜之后或在形成保护膜（SiO 2，Si 3 N 4等）和反射膜（Al，Cu等）的层叠膜之后进行。虽然热处理可以在大气中进行，但是优选在惰性气体（N 2，Ar，He等）或真空中进行处理，以将由氧化引起的特性劣化控制在最小限度。虽然热处理温度取决于磁性薄膜的特性，优选在温度下进行处理。范围100-500摄氏度

98. 发明专利

JPS6113456A Manufacture of photomagnetic recording medium 失效
标题翻译：光电记录介质的制造
公开(公告)号：JPS6113456A
公开(公告)日：1986-01-21
申请号：JP13287784
申请日：1984-06-29
申请人： Hitachi Ltd
发明人： NIIHARA TOSHIO , KANEKO KATSUHIRO , TAKAYAMA SHINJI , SUGITA KEN
IPC分类号： C23C14/00 , C23C14/22 , G11B11/10 , G11B11/105 , H01F10/12 , H01F10/13 , H01F41/18
CPC分类号： G11B11/10586 , G11B11/105
摘要： PURPOSE:To obtain the photomagnetic recording medium excellent in reproducibility and never causes a device to deteriorate by using mixed gas of inert gas and hydrogen gas as sputter gas used for sputtering. CONSTITUTION:A target which has a small piece of Tb arranged on a Co disk of 110mm. in diameter so that its occupation area is 35% of that of the disk is used. A vacuum is produced up to a 8X10 Torr attainable degree of vacuum and then the mixed sputter gas of hydrogen gas varied in addition amount and argon gas is admitted into a vacuum tank for sputtering; and high frequency electric power of 100W is applied under 5X10 Torr total pressure to perform sputtering, thereby forming a Tb-Co thin film on a glass substrate. Even if there is time or spatial variation in hydrogen partial pressure PH2, the value Ku does not vary greatly and the reproducibility of the Ku value is high. The Ku value is controllable according to the composition of the target for sputtering, i.e. the number of Tb small pieces arranged on the Co plate.
摘要翻译：目的：为了获得再现性优异的光磁记录介质，并且不会通过使用惰性气体和氢气的混合气体作为用于溅射的溅射气体而使装置劣化。构成：具有布置在110mm的Co盘上的一小块Tb的靶。使其占用面积为使用磁盘的35％。产生高达8×10 -7乇可达真空度的真空，然后氢气混合溅射气体的添加量变化，氩气进入真空槽进行溅射; 在5×10 -3 Torr总压下施加100W的高频电力进行溅射，从而在玻璃基板上形成Tb-Co薄膜。即使在氢分压PH2中存在时间或空间变化，Ku值也不会很大变化，Ku值的再现性也高。 Ku值可以根据溅射靶的组成，即布置在Co板上的Tb小片的数量来控制。

99. 发明专利

JPS60170048A PHOTOMAGNETIC MEMORY DEVICE 失效
公开(公告)号：JPS60170048A
公开(公告)日：1985-09-03
申请号：JP2503284
申请日：1984-02-15
申请人： HITACHI LTD
发明人： KATOU TAKESHI , OSHIMA MASAHIRO , NIIHARA TOSHIO
IPC分类号： G11B5/02 , G11B11/10 , G11B11/105
摘要： PURPOSE:To attain the accurate recording and its erasion of information by setting the leakage magnetic field of an actuator and the initial magnetization of a magnetic thin film of a recording medium in the same direction. CONSTITUTION:A recording medium 17 consists of a transparent substrate 17a and a magnetic thin film 17b, and the laser light is condensed on the film 17b in the form of a microspot via the substrate 17a. A magnetic field is set in a fixed direction, and the medium 17 is put into the magnetic field. Then the initial magnetization is set so that the direction of magnetization Hb of the film 17b is set vertical. A leakage magnetic field Ha can be used effectively by obtaining the coincidence between the magnetizing direction and the direction of the field Ha of an actuator. Thus the accurate record and erasion are possible for information. Furthermore a memory domain can be reduced and therefore the density of storage is improved.

100. 发明专利

JPS5938949A Magneto-optical reproducer 失效
标题翻译：磁光重复机
公开(公告)号：JPS5938949A
公开(公告)日：1984-03-03
申请号：JP14764682
申请日：1982-08-27
申请人： Hitachi Ltd
发明人： NIIHARA TOSHIO , OSHIMA MASAHIRO , SHIROISHI YOSHIHIRO , FUJIWARA HIDEO
IPC分类号： G11B11/10 , G11B11/105 , G11C13/06
CPC分类号： G11B11/10532
摘要： PURPOSE:To obtain a large output of reproduction, by providing an analyzer and a photodetector at both sides of a recording medium, and making use of both Kerr effect of reflected light and Faraday effect of transmitted light at a time to perform a magneto-optical reproduction. CONSTITUTION:The light sent from a laser light source 1 passes through a polarizer 2 and irradiated to a recording medium 4 after having its optical path bent by a half mirror 3. When the magnetization of the medium 4 is set upward, the polarized wave surface of the reflected light 6 turns by a Kerr revolving angle +thetaK to the polarized wave surface of the incident light 8. The light 7 transmitted through a substrate 5 turns by a Faraday revolving angle +thetaF. Then the light 6 passes through an optical detector 9 having its quenching direction turned by -thetaK and is detected by a photodetector 11. As the detector 10 has its quenching direction turned by -thetaF, no transmitted light 7 reaches a photodetector 12. Therefore, a reproduced signal having about doubled value of VR, where Vr is obtained when only the Faraday effect is used can be obtained by supplying outputs +VR and 0 which is applied with the photoelectric conversion by the detectors 11 and 12 to a differential amplifier 15.
摘要翻译：目的：为了获得大量的再生产，通过在记录介质的两侧设置分析器和光电检测器，并且一次利用反射光的克尔效应和透射光的法拉第效应两者来执行磁光再生产。构成：从激光光源1发出的光通过偏振器2，在其光路被半反射镜3弯曲之后照射到记录介质4.当介质4的磁化被设定为向上时，偏振波面反射光6通过克尔旋转角度+ thetaK转动到入射光8的偏振波面。透过基板5的光7以法拉第旋转角度+θF转动。然后光6通过其淬火方向为-taK的光学检测器9，并由光电检测器11检测。由于检测器10的淬火方向为-taF，因此没有透射光7到达光电检测器12.因此，可以通过将由检测器11和12的光电转换所提供的输出+ VR和0提供给差分放大器15来获得具有大约二值VR的再现信号，其中当仅使用法拉第效应时获得Vr。

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