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91. 发明专利

JPH03194744A OVERWRITABLE MAGNETO-OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH03194744A
公开(公告)日：1991-08-26
申请号：JP33274589
申请日：1989-12-25
申请人： HITACHI LTD , HITACHI MAXELL
发明人： MIYAMOTO JIICHI , NIIHARA TOSHIO , OTA NORIO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To obtain a large Kerr rotation angle by setting the Curie temp. of a first magnetic layer higher than the Curie temp. of a second magnetic layer. CONSTITUTION:The Curie temp. of the first magnetic layer 3 is made higher than the Curie temp. of the second magnetic layer 4. Since the magneto-optical effect, namely the Kerr effect, becomes large as the higher Curie temp. of the first magnetic layer 3 is higher, the direction of the magnetic field for recording is set opposite to the direction for which the directions of magnetization in the first magnetic layer 3 are made uniform when the layer 3 is irradiated with laser beam of low intensity. Thereby, a large Kerr rotation angle can be obtained without decreasing the recording sensitivity.

92. 发明专利

JPH02226531A STRUCTURE OF OPTICAL DISK 失效
公开(公告)号：JPH02226531A
公开(公告)日：1990-09-10
申请号：JP4301189
申请日：1989-02-27
申请人： HITACHI LTD , HITACHI MAXELL
发明人： KIRINO FUMIYOSHI , MIYAMOTO JIICHI , OTA NORIO
IPC分类号： G11B11/105 , G11B11/10
摘要： PURPOSE:To prevent a recording layer from being corroded via a substrate by providing a dielectric layer of an inorg. compd. between the recording layer and a metallic layer with a multiple interference effect of light. CONSTITUTION:The 1st dielectric layer 2 consisting of the inorg. compd., the recording layer 3, the 2nd dielectric layer 4 consisting of the inorg. compd., and the metallic layer 5 are formed on a disk substrate 1 having rugged guide grooves. A Kerr enhancement effect is provided by the multiple interference effect to the layer 4 between the layer 3 and the layer 5. Since the film thickness of the layer 2 is not governed by optical characteristics (the thickness at which the multiple interference of light takes place) in this way, the layer 2 can be formed to the film thickness taking only the protective effect into consideration. The layer 3 is thus prevented from being corroded via the substrate 1.

93. 发明专利

JPH02108254A MAGNETO-OPTICAL RECORDING MEDIUM AND PRODUCTION THEREOF 失效
公开(公告)号：JPH02108254A
公开(公告)日：1990-04-20
申请号：JP25946488
申请日：1988-10-17
申请人： HITACHI LTD
发明人： NIIHARA TOSHIO , MIYAMOTO JIICHI , KATO KEIZO , OTA NORIO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To decrease the generation of a incomplete erasing by forming the metallic film on guiding grooves of a substrate on which a magnetic film and the metallic film are provided to the film thickness larger than the film thickness of the metallic film on the flat lands between the guiding grooves. CONSTITUTION:The guiding grooves (grooves) 7 each having a U shape are formed on the substrate 1. An SiN film 2 is formed on the substrate 1 and a magnetic Tb-Fe-Co-Nb film 3 is formed thereon. A metallic Al-Si film 4 is then formed thereon and is subjected to sputter etching, by which the Al-Si film 4 on the grooves is formed thicker than the Al-Si film 4 on the flat lands 6 between the grooves 7. An SiN film 5 is formed upon after the sputter etching. Recording is made only in the magnetic domains of the land parts 6 even if off-tracking is generated by a degradation of the recording sensitivity of the magnetic films 3 on the grooves 7 in such a manner. The generation of the incomplete erasing is, therefore, decreased.

94. 发明专利

JPH0291837A MAGNETO-OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH0291837A
公开(公告)日：1990-03-30
申请号：JP24098088
申请日：1988-09-28
申请人： HITACHI LTD
发明人： NIIHARA TOSHIO , MIYAMOTO JIICHI , OTA NORIO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To decrease incomplete erasing by disposing respective metallic films and magnetic films on grooves and the lands between the grooves in prescribed relations. CONSTITUTION:Multilayered films of transparent films 2, 4, the magnetic films 3 and the metallic films 5 are formed on the grooves 6 of a prescribed pitch on a polycarbonate substrate 1. The multilayered films are formed similarly on the lands 7 between the grooves 6 as well. The surfaces of the magnetic films on the lands 7 on the substrate 1 side are positioned nearer the substrate 1 side than the surfaces of the films 5 on the grooves 5 on the side opposite to the substrate 1. The heat of the magnetic films on the lands 7 is, therefore, diffused laterally via the metallic films of the adjacent grooves if the films are irradiated with laser light along the grooves 6. The formation of the recording magnetic domains on the magnetic films on the lands 7 is thus substantially prohibited and the incompleted erasing is drastically decreased.

95. 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.

96. 发明专利

JPH01286151A MAGNETO-OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH01286151A
公开(公告)日：1989-11-17
申请号：JP11462888
申请日：1988-05-13
申请人： HITACHI LTD
发明人： NIIHARA TOSHIO , OKAMINE SHIGENORI , MIYAMOTO JIICHI , OTA NORIO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To improve the adhesiveness of a substrate and to facilitate the formation of the medium by providing a low melting metal film having a specific m.p. on the substrate in contact therewith. CONSTITUTION:The metallic film 2 consisting of the low melting metal selected from Bi, Sn, Zn, Cd, Ca, Pb, Tl, and In having

97. 发明专利

JP2014006959A Information recording device 有权
标题翻译：信息记录装置
公开(公告)号：JP2014006959A
公开(公告)日：2014-01-16
申请号：JP2013214736
申请日：2013-10-15
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： IGARASHI KAZUSUKATSU , MIYAMOTO JIICHI
IPC分类号： G11B5/31 , G11B5/02 , G11B5/65
CPC分类号： H01L43/08 , G11B5/314 , G11B2005/001 , G11B2005/0024 , H01L27/22
摘要： PROBLEM TO BE SOLVED: To provide an information recording device which has high reliability by accelerating excellent flux reversal of a magnetic recording medium in microwave assist recording.SOLUTION: A retraction part from an ABS surface is provided at a track width-directional end of a bottom surface of an FGL laminate film for high-frequency magnetic field generation. Alternatively, the FGL laminate film is sectioned in an inverted trapezoid shape (along a plane perpendicular to a direction in which a current flow) or increases in sectional area away from a main magnetic pole side. An excellent recording pattern is formed on a recording medium, so while the recording density of an information recording device can be increased, the reliability is improved, thereby lowering the cost eventually.
摘要翻译：要解决的问题：提供一种信息记录装置，其通过加速微波辅助记录中的磁记录介质的良好的磁通反转而具有高的可靠性。解决方案：来自ABS表面的退回部分设置在用于高频磁场产生的FGL层压膜的底面。或者，FGL层叠膜以倒梯形（沿着与电流流动的方向垂直的平面）分割，或者与主磁极侧的截面积增加。在记录介质上形成良好的记录图形，因此，可以提高信息记录装置的记录密度，提高可靠性，从而最终降低成本。

98. 发明专利

JP2012038391A Magnetic head slider and magnetic record replay device 审中-公开
标题翻译：磁头滑块和磁记录复位装置
公开(公告)号：JP2012038391A
公开(公告)日：2012-02-23
申请号：JP2010179371
申请日：2010-08-10
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： MIYAMOTO JIICHI
IPC分类号： G11B5/31 , G11B5/012 , G11B5/02 , G11B5/23
摘要： PROBLEM TO BE SOLVED: To replay a high density recording with a magnetic record device using a magnetic record head having a replay element and an energy assistance mechanism.SOLUTION: A high resolution direction 81 of a replay element 34 is set to be inclined to a slider running direction 80 so that the high resolution direction is approximately vertical to a transition edge direction of a single recording mark.
摘要翻译：要解决的问题：使用具有重放元件和能量援助机构的磁记录头，用磁记录装置重播高密度记录。解决方案：重放元件34的高分辨率方向81被设置为与滑块行进方向80倾斜，使得高分辨率方向大致垂直于单个记录标记的过渡边缘方向。版权所有（C）2012，JPO＆INPIT

99. 发明专利

JP2011014214A Information recording and reproducing head, and thermally assisted magnetic recording apparatus 有权
标题翻译：信息记录和复制头，以及热辅助磁记录装置
公开(公告)号：JP2011014214A
公开(公告)日：2011-01-20
申请号：JP2009159606
申请日：2009-07-06
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： MIYAMOTO JIICHI , MATSUMOTO TAKUYA , NANBA IRIZO
IPC分类号： G11B5/31 , G11B5/02 , G11B5/60
CPC分类号： G11B5/314 , G11B2005/0005 , G11B2005/0021
摘要： PROBLEM TO BE SOLVED: To solve the problem of a conventional thermally assisted magnetic recording head in which the intensity of light propagated in a waveguide is fluctuated by a disturbance such as temperature change or vibration or degradation with time of a semiconductor laser, and the fluctuation of the intensity of light incident on the surface of a medium disables stable recording of a magnetic recording apparatus.SOLUTION: A near-field light generating element 32 is disposed near the air bearing surface (ABS) of a slider 30, and a magnetic recording and reproducing element 34 is provided near the near-field light generating element 32. On the surface of the slider 30 opposite from the ABS, a laser diode unit 31 is installed and the near-field light generating element 32 is irradiated with the light outgoing from the laser diode unit 31 through the waveguide 33. The near-field light generating element 32 is connected with electrode pads 40 and 41 through conductors 42 and 43. The near-field light generating element 32 serves also as a temperature detection element.
摘要翻译：要解决的问题：为了解决常规的热辅助磁记录头的问题，其中在波导中传播的光的强度由于诸如温度变化或振动或半导体激光器随时间的劣化的干扰而波动，并且波动入射在介质表面上的光的强度使得磁记录装置的稳定记录失效。解决方案：近场光产生元件32设置在滑动件30的空气轴承表面（ABS）附近，并且磁记录并且在近场光产生元件32附近设置再现元件34.在滑块30的与ABS相对的表面上，安装有激光二极管单元31，并且将近场光产生元件32照射出来激光二极管单元31通过波导33。近场光产生元件32通过导体42和43与电极焊盘40和41连接。T 他的近场光产生元件32也用作温度检测元件。

100. 发明专利

JP2011014213A Method of recording multilayer optical disk 有权
标题翻译：记录多层光盘的方法
公开(公告)号：JP2011014213A
公开(公告)日：2011-01-20
申请号：JP2009159535
申请日：2009-07-06
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： MIYAMOTO JIICHI , WATANABE KOICHI , NAGAI YUTAKA , NISHIMURA KOICHIRO , YASUKAWA TAKAKIYO
IPC分类号： G11B7/0045 , G11B7/007
CPC分类号： G11B7/00736 , G11B7/1267 , G11B7/24038 , G11B2007/0013
摘要： PROBLEM TO BE SOLVED: To provide a method of recording a multilayer optical disk for performing recording while securing sufficient test areas without reducing user data areas, and while suitably controlling the power of laser beam irradiated onto each of the layers.SOLUTION: The method uses an optical disk which has at least a first recording layer and a second recording layer located on the side nearer to the light incident surface than the first recording layer, and which respectively has a first test area configured of a plurality of segments in the first recording layer and a second test area configured of a plurality of segments in the second recording layer. There is defined beforehand a predetermined radial distance L corresponding to relative precision of radial positions between the plurality of layers and the optical spot diameter. If an arbitrary segment in the second test area is already test-recorded, a segment in the first test area, the radial distance from which to the recorded test area in the second test area is within the range of the predetermined radial distance L, is set as a segment in which the test recording is not to be performed. Thereby, even if the radial positions of the test areas are overlapped with each other, the learning of optical power is precisely performed.
摘要翻译：要解决的问题：提供一种记录用于执行记录的多层光盘的方法，同时确保足够的测试区域而不减少用户数据区域，并且同时适当地控制照射到每个层上的激光束的功率。解决方案：该方法使用具有至少第一记录层和位于比第一记录层更靠近光入射面的一侧的第二记录层的光盘，并且分别具有由第一记录中的多个段构成的第一测试区层和由第二记录层中的多个段构成的第二测试区。预先确定对应于多个层之间的径向位置与光点直径的相对精度的预定径向距离L. 如果第二测试区域中的任意段已经被测试记录，则第一测试区域中的第二测试区域中记录的测试区域的径向距离在预定的径向距离L的范围内的段是设置为不执行测试记录的段。因此，即使测试区域的径向位置彼此重叠，也能够精确地进行光功率的学习。

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