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1. 发明专利

JP2010186548A Information reproducing device and reproduction signal processing circuit 有权
标题翻译：信息再现设备和生成信号处理电路
公开(公告)号：JP2010186548A
公开(公告)日：2010-08-26
申请号：JP2010086664
申请日：2010-04-05
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： KIKUKAWA ATSUSHI , MINEMURA HIROYUKI
IPC分类号： G11B20/14 , G11B7/005 , G11B20/10 , G11B20/18
摘要： PROBLEM TO BE SOLVED: To stably operate a PLL (Phase-locked loop) even in if an S/N ratio is low in a Blu-ray Disc (R) reproduction system.
SOLUTION: The loop composition of a PLL is changed in accordance with an operational state, and an FIR equalizer output is used for detecting a phase. An optical disk reproduction signal processing system is provided that achieves a low error rate even in a state in which the S/N ratio of an input signal is low, avoids an edge low in phase-detection precision and a signal string which is erroneously detected as an edge with high possibility by a conventional method, and is ready for various modes of input signals.
COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：即使在蓝光盘（R）再现系统中S / N比低的情况下，也可稳定地操作PLL（锁相环）。解决方案：根据操作状态改变PLL的环路组成，并且使用FIR均衡器输出来检测相位。提供一种光盘再生信号处理系统，即使在输入信号的S / N比低的状态下也能够实现低误码率，避免了相位检测精度的边缘偏差和错误检测的信号串作为通过常规方法具有高可能性的边缘，并且可以用于各种模式的输入信号。版权所有（C）2010，JPO＆INPIT

2. 发明专利

JP2010086639A Optical disk device 有权
标题翻译：光盘设备
公开(公告)号：JP2010086639A
公开(公告)日：2010-04-15
申请号：JP2008257808
申请日：2008-10-02
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： KIKUKAWA ATSUSHI
IPC分类号： G11B7/005 , G11B7/125
CPC分类号： G11B20/10009 , G11B7/126 , G11B20/10046 , G11B20/10222 , G11B20/10296 , G11B20/1403 , G11B2220/2541
摘要： PROBLEM TO BE SOLVED: To exclude, to the utmost, analog elements which are significantly different in characteristics from each other, from an optical disk drive. SOLUTION: An optical disk device has: a means 38, 39 which convert the sampling frequency of a pulse-reproducing signal to a different frequency; a means 40, 41 for converting a modulation clock frequency at the same rate as the sampling frequency; and a means for automatically setting a sampling frequency-converting means and a modulation clock-converting means on the basis of a channel clock. COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：从光盘驱动器最大限度地排除彼此显着不同的特征的模拟元件。解决方案：光盘装置具有：将脉冲再现信号的采样频率转换成不同频率的装置38,39; 用于以与采样频率相同的速率转换调制时钟频率的装置40,41; 以及用于基于通道时钟自动设置采样频率转换装置和调制时钟转换装置的装置。版权所有（C）2010，JPO＆INPIT

3. 发明专利

JP2006344294A INFORMATION REPRODUCING DEVICE AND REPRODUCING SIGNAL PROCESSING CIRCUIT 审中-公开
公开(公告)号：JP2006344294A
公开(公告)日：2006-12-21
申请号：JP2005168979
申请日：2005-06-09
申请人： HITACHI LTD
发明人： KIKUKAWA ATSUSHI , MINEMURA HIROYUKI
IPC分类号： G11B20/14 , G11B7/005 , G11B20/18
摘要： PROBLEM TO BE SOLVED: To stably operate a PLL even under the situation of a low SN ratio in the reproducing system of a Blue-ray Disc. SOLUTION: The loop configuration of a PLL is changed according to an operation situation, and an FIR equalizer output is used for phase detection. An optical disk reproducing signal processing system capable of achieving a low error rate even under the situation of the low SN ratio of an input signal, and preventing the edge of low phase detection accuracy and a signal string highly likely to be erroneously detected as an edge according to a conventional method to deal with the input signals of various forms, is realized. COPYRIGHT: (C)2007,JPO&INPIT

4. 发明专利

JP2005216364A Signal evaluation method and device therefor 有权
标题翻译：信号评估方法及其设备
公开(公告)号：JP2005216364A
公开(公告)日：2005-08-11
申请号：JP2004020689
申请日：2004-01-29
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： MAEDA TAKESHI , MINEMURA HIROYUKI , KIKUKAWA ATSUSHI
IPC分类号： G11B7/24 , G11B20/10 , G11B20/14 , G11B20/18
摘要： PROBLEM TO BE SOLVED: To solve the problem that the quality of a signal is possibly decreased in a PRML compliant device unless a recording method is optimum to the PRML (Partial Response Maximum Likelihood). SOLUTION: A signal processing circuit which reproduces information is provided with at lest a nonlinear processing circuit and a linear processing circuit. Consequently, recording and reproduction can be carried out while maintaining compatibility even in an optical disk which reproduces information with a different reproducing method. COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：为了解决在PRML兼容装置中可能降低信号质量的问题，除非记录方法对PRML（部分响应最大似然）是最佳的。解决方案：以非线性处理电路和线性处理电路提供再现信息的信号处理电路。因此，即使在以不同的再现方法再现信息的光盘中，也可以保持兼容性而进行记录和再现。版权所有（C）2005，JPO＆NCIPI

5. 发明专利

JP2003228927A MAGNETIC DISK DEVICE MAGNETIC RECORDING MEDIUM, AND SERVO WRITE SYSTEM 审中-公开
公开(公告)号：JP2003228927A
公开(公告)日：2003-08-15
申请号：JP2002022679
申请日：2002-01-31
申请人： HITACHI LTD
发明人： TOMIYAMA HIROSHI , HAMAGUCHI KATSUHIKO , KIKUKAWA ATSUSHI
IPC分类号： G11B5/65 , G11B5/596 , G11B5/667 , G11B20/12 , G11B21/10
摘要： PROBLEM TO BE SOLVED: To provide a servo write system which seldom has a servo error for a magnetic disk drive which uses a vertical medium. SOLUTION: The magnetic disk drive is mounted with a medium having a servo area so constituted that at least one point where no servo sector is present on a ray connecting the center of rotation of a recording medium and one arbitrary point on the outermost circumferential track of the recording medium is present on the outermost circumferential track in a system characterized by B×N>2π, where B is the angle of an area that a servo pattern track occupies to the center of rotation and N is the number of servo samples. COPYRIGHT: (C)2003,JPO

6. 发明专利

JP2002342909A PERPENDICULAR MAGNETIC RECORDING MEDIUM AND METHOD OF MANUFACTURING THE SAME AS WELL AS MAGNETIC MEMORY DEVICE 失效
公开(公告)号：JP2002342909A
公开(公告)日：2002-11-29
申请号：JP2001143637
申请日：2001-05-14
申请人： HITACHI LTD
发明人： TANAHASHI KIWAMU , KIKUKAWA ATSUSHI , SHIMIZU NOBORU , HONDA YUKIO , HOSOE YUZURU
IPC分类号： G11B5/65 , G11B5/66 , G11B5/667 , G11B5/73 , G11B5/738 , G11B5/851 , G11B5/852
摘要： PROBLEM TO BE SOLVED: To provide a double-layer perpendicular magnetic recording medium having a high medium signal-to-noise ratio at a recording density above 50 giga-bit per square inch, and a magnetic memory device having a low error rate and high reliability. SOLUTION: This perpendicular magnetic recording medium is constituted by successively laminating a magnetic domain control layer 12, amorphous soft magnetic ground surface layer 13, intermediate layer 14 and perpendicular recording layer 15 on a substrate 11. This magnetic domain control layer 12 is formed of three-layered films formed by laminating, successively from the substrate side, a first polycrystalline soft magnetic layer, an irregular system antiferromagnetic layer and a second polycrystalline soft magnetic layer.

7. 发明专利

JP2002269718A PERPENDICULAR MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE 失效
公开(公告)号：JP2002269718A
公开(公告)日：2002-09-20
申请号：JP2001072941
申请日：2001-03-14
申请人： HITACHI LTD
发明人： HONDA YUKIO , FUTAMOTO MASAAKI , TANAHASHI KIWAMU , KIKUKAWA ATSUSHI
IPC分类号： G11B5/673 , G11B5/64 , G11B5/65 , G11B5/66 , G11B5/667 , G11B5/738 , H01F10/16 , H01F10/26
摘要： PROBLEM TO BE SOLVED: To provide a perpendicular magnetic recording medium having excellent low noise characteristics and stability of recording magnetization and suitable for super high density magnetic recording and to provide a magnetic storage device. SOLUTION: In the perpendicular magnetic recording medium, a perpendicularly magnetized film 20 having a laminated structure consisting of Co/(Pt or Pd) multilayered films 14, 16 and 18 and Co-Xa/(Pt or Pd) multilayered films 15 and 17 (Xa: Cr, B, Ta, Mn, V) or consisting of the Co/(Pt or Pd) multilayered films and Co/(Pt-Ya or Pd-Ya) multilayered films (Ya: B, Ta, Ru, Re, Ir, Mn, Mg, Zr, Nb) is used and an amorphous material or a polycrystalline thin film having a noncolumnar structure is used as a backing layer 12 whose magnetic domain structure is controlled by a magnetic domain fixing layer.

8. 发明专利

JP2000315311A VERTICAL MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE 失效
公开(公告)号：JP2000315311A
公开(公告)日：2000-11-14
申请号：JP12591699
申请日：1999-05-06
申请人： HITACHI LTD
发明人： HONDA YUKIO , HIRAYAMA YOSHIYUKI , KIKUKAWA ATSUSHI , FUTAMOTO MASAAKI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/738
摘要： PROBLEM TO BE SOLVED: To obtain a vertical magnetic recording medium that has a superior low noise characteristic and a stable recording magnetization and that is suitable for super high density magnetic recording, by reducing the irregularly structured magnetic domain formed on the medium surface or micronizing the structure of the magnetic domain. SOLUTION: In a magnetization-magnetic field curve in the direction vertical to the film surface of a medium, in which the first quadrant has a positive magnetization and field and in which the second quadrant has a positive magnetization and a negative field; assuming the field strength is dHc at the intersection between a tangent line passing through the coercive force -He point of the second quadrant of the curve and a straight line drawn parallelly to the field axis from the saturation magnetization Ms of the curve; the medium is used in which the coercive force -Hc of the second quadrant and the saturation magnetization dHc satisfy the relational expression of 0

9. 发明专利

JPH09180274A OPTICAL DEVICE AND PROBE THEREFOR 失效
公开(公告)号：JPH09180274A
公开(公告)日：1997-07-11
申请号：JP34027195
申请日：1995-12-27
申请人： HITACHI LTD
发明人： HOSAKA SUMIO , KIKUKAWA ATSUSHI , SHINTANI TOSHIMICHI
IPC分类号： G01N21/01 , G01Q60/18 , G01Q60/22 , G01Q80/00 , G02B6/00 , G02B6/28 , G11B7/135 , G11B9/00
摘要： PROBLEM TO BE SOLVED: To make it possible to control magnitude of a recording bit and pattern width, etc., by controlling evanescent light quantity to be used in information recording and pattern forming. SOLUTION: The optical fiber probe for which an optical coupler 9 dividing laser beams into more than two optical fibers 8, 10 or an optical switch introducing beams to either one optical fiber among two are used and the top end of at least one optical fiber is made acute to be an evanescent optical probe 42 is used. Damage of the probe can be easily dealt with by integrating the fibers 8, 10 and the optical coupler 9 or the optical switch to form the probe.

10. 发明专利

JPH04132409A SURFACE ACOUSTIC WAVE RESONATOR 失效
公开(公告)号：JPH04132409A
公开(公告)日：1992-05-06
申请号：JP25197590
申请日：1990-09-25
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： TABUCHI TOYOJI , HIKITA MITSUTAKA , SHIBAGAKI NOBUHIKO , KIKUKAWA ATSUSHI , AKAGI TAKATOSHI , SUZUKI KAZUTOSHI
IPC分类号： H03H9/145 , H03H9/64
摘要： PURPOSE:To suppress the degradation in the characteristic between attenuation poles by forming a multi-pair transducer of one-aperture surface acoustic wave resonator with the combination of >= two regions with different electrode pitches. CONSTITUTION:This surface acoustic wave transducer consists of plural regions and each region is arranged with plural interdigital electrode pairs continuously at the same pitch and pitches P1, P2 of the interdigital electrode pairs of the adjacent regions are made different. That is, the transducer consists of regions (5-1)-(5-2) in which the electrode finger pitch of the transducer is P1 and regions (6-1)-(6-3) in which the electrode finger pitch of the transducer is P2. In this case, the resonance characteristic of the one-aperture surface acoustic wave resonator in which the multi-pair transducer consists of plural regions whose electrode finger pitch differs has plural attenuation poles corresponding to the plural electrode pitches. Thus, since the resonator composite filter composed of plural one-aperture surface acoustic wave resonators has attenuation poles more then the total number of the one-aperture surface acoustic wave resonators, the frequency difference between the attenuation poles is set small and the degradation in the characteristic between the attenuation poles is suppressed.

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