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1. 发明专利

JP2008077795A Clock extraction method for patterned medium, clock extraction circuit for patterned medium and patterned medium 审中-公开
标题翻译：时间提取方法，用于图形介质的时钟提取方法和图形化介质的时钟提取电路
公开(公告)号：JP2008077795A
公开(公告)日：2008-04-03
申请号：JP2006257852
申请日：2006-09-22
申请人： Fujitsu Ltd , 富士通株式会社
发明人： IZUMI HARUHIKO
IPC分类号： G11B20/10
CPC分类号： G11B20/14 , B82Y10/00 , G11B5/59616 , G11B5/743 , G11B5/746 , G11B5/855 , G11B2220/2516
摘要： PROBLEM TO BE SOLVED: To accurately match a timing of a clock signal with a magnetic dot of a patterned medium.
SOLUTION: A magnetic part 16 arraying magnetic dots 15 for recording a magnetic signal at every certain intervals and a nonmagnetic part 17 not recording a magnetic signal are formed in the patterned medium 11. A position of the nonmagnetic part 17 not recording a magnetic signal is detected by a magnetic head and a clock signal is synchronized with a detection signal of the nonmagnetic part 17.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：准确地将时钟信号的定时与图案化介质的磁点相匹配。解决方案：在图案化介质11中形成排列用于以每隔一定间隔记录磁信号的磁性点15和未记录磁信号的非磁性部分17的磁性部分16.未记录磁性部分17的位置磁信号由磁头检测，时钟信号与非磁性部分17的检测信号同步。（C）2008，JPO＆INPIT

2. 发明专利

JP2007242152A Magnetic recording medium, magnetic recorder, and servo demodulation circuit 审中-公开
标题翻译：磁记录介质，磁记录器和伺服解调电路
公开(公告)号：JP2007242152A
公开(公告)日：2007-09-20
申请号：JP2006063992
申请日：2006-03-09
申请人： Fujitsu Ltd , 富士通株式会社
发明人： SHIBANO MOTOMICHI , IZUMI HARUHIKO
IPC分类号： G11B21/10
CPC分类号： G11B5/59688 , G11B2020/1281
摘要： PROBLEM TO BE SOLVED: To control the position of a magnetic head so as to make fluctuation and deviation of the position of the magnetic head small by accurately performing track positioning of the magnetic head for recording/reproducing data to/from a magnetic recording medium with high accuracy. SOLUTION: The magnetic recording medium on which a signal is recorded by changing the magnetized state of a magnetic body has areas of high recording frequency servo signal patterns 15a and 15c and low recording frequency servo signal patterns 16a and 16c recorded by different recording frequencies in parallel with a central track 13 so as to be read by a reproducing head 10 when the reproducing head 10 reproduces a servo signal used to control the position of the reproducing head 10 along a prescribed track. COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：为了通过精确地执行用于磁/磁记录/再现数据的磁头的磁道定位来控制磁头的位置以使磁头的位置的波动和偏差小高精度记录介质。解决方案：通过改变磁体的磁化状态来记录信号的磁记录介质具有高记录频率伺服信号图形15a和15c以及由不同记录记录的低记录频率伺服信号图形16a和16c的区域频率与中心轨道13并联，以便当再现头10再现用于控制再现头10沿着规定轨道的位置的伺服信号时由再现头10读取。版权所有（C）2007，JPO＆INPIT

3. 发明专利

JP2003317309A Optical disk device 审中-公开
标题翻译：光盘设备
公开(公告)号：JP2003317309A
公开(公告)日：2003-11-07
申请号：JP2002123628
申请日：2002-04-25
申请人： Fujitsu Ltd , 富士通株式会社
发明人： IZUMI HARUHIKO , TEZUKA KOICHI
IPC分类号： G11B25/04 , G11B7/085 , G11B7/14
摘要： PROBLEM TO BE SOLVED: To provide an optical disk device in which an access time of an optical head is further shortened.
SOLUTION: In the optical disk device provided with the optical head for performing recording/reproducing to/from an optical disk and a carriage mounted with the optical head for performing the seek operation of the optical head in the direction of a radius of a disk D, the carriage is composed of a plurality of carriages 10A-10H located at equal intervals in the direction of a circumference of the optical disk, each of the carriages 10A-10H is equipped with a plurality of optical heads 20a-20f arranged in the direction of the radius of the optical disk, and the location of the plurality of optical heads 20a-20f is equal in the respective carriages 10A-10H. The respective carriages 10A-10H are configured to simultaneously perform the seek operations to make their positions the same in the direction of the radius of the disk D.
COPYRIGHT: (C)2004,JPO
摘要翻译：解决的问题：提供一种进一步缩短光头的访问时间的光盘装置。＆lt; P＆gt;解决方案：在具有用于向光盘执行记录/再现光学头的光盘装置和安装有光学头的滑架，用于在半径方向上执行光学头的寻找操作盘D，滑架由在光盘圆周方向等间隔设置的多个滑架10A-10H组成，每个滑架10A-10H配备有多个光学头20a-20f，其配置有多个光头20a-20f 在光盘的半径方向上，并且多个光头20a-20f的位置在相应的托架10A-10H中相等。相应的托架10A-10H被配置为同时执行搜索操作以使其位置在盘D的半径方向上相同。版权所有（C）2004，JPO

4. 发明专利

JP2001291340A DATA REPRODUCING SYSTEM FROM OPTICAL DISK 失效
公开(公告)号：JP2001291340A
公开(公告)日：2001-10-19
申请号：JP2001079593
申请日：2001-03-19
申请人： FUJITSU LTD
发明人： TAGUCHI MASAKAZU , IZUMI HARUHIKO
IPC分类号： G11B20/14 , G11B7/005 , G11B20/10 , G11B20/18
摘要： PROBLEM TO BE SOLVED: To provide a data reproducing system of an optical disk which can correctly detect data by assuring a detection margin for data detection. SOLUTION: This data reproducing system is achieved by having a signal reproducing means, a sampling means which samples reproduced signals at prescribed timing, a first maximum likelihood data detecting means which defines the most likely first data expressed by the front edge of recording pits in accordance with sampling data, a second maximum likelihood data detecting means which defines the most likely second data expressed by the rear edge of the recording pits in accordance with the sampling data and a data synthesizing means which forms the reproduction data by synthesizing the first data and the second data.

5. 发明专利

JP2001291250A TRACKING CONTROL METHOD, TRACKING CONTROLLER AND OPTICAL DISK DEVICE UTILIZING THE SAME METHOD 失效
公开(公告)号：JP2001291250A
公开(公告)日：2001-10-19
申请号：JP2000101611
申请日：2000-04-03
申请人： FUJITSU LTD
发明人： NAKAO YOSHIHIRO , IZUMI HARUHIKO
IPC分类号： G11B7/09
摘要： PROBLEM TO BE SOLVED: To provide the tracking control method and a tracking controller capable of correcting the offset caused by stray light and performing the highly accurate tracking control and to provide an optical disk device utilizing this method. SOLUTION: The device is provided with a photodetecting means 10 which receives light reflected from a recording medium 1 and outputs a photodetecting signal corresponding to the light quantity distribution of the incident light, and control signal producing means 22-24 for producing the position control signal of a light spot on the basis of the photodetection signal outputted from the photodetecting means 10. The position of the light spot is adjusted on the basis of the position control signal. The control signal producing means 22-24 are provided with control target signal producing means 23, 24 for producing the control target signal corresponding to the light quantity distribution of the incident light to the photodetecting means 10 at the position where the light spot is to be adjusted on the basis of the photodetecting signal. The device is constituted so that the position control signal of the light spot is produced on the basis of the control target signal and the photodetecting signal to solve the above tasks.

6. 发明专利

JPH11154362A REPRODUCING METHOD FOR INFORMATION RECORDED IN MAGNETO-OPTICAL RECORDING MEDIUM AND DEVICE THEREFOR 失效
公开(公告)号：JPH11154362A
公开(公告)日：1999-06-08
申请号：JP26019098
申请日：1998-09-14
申请人： FUJITSU LTD
发明人： IZUMI HARUHIKO , TAMANOI TAKESHI , MORITSUGU MASAHARU , MAEDA KIYOMI
IPC分类号： G11B11/10 , G11B7/125 , G11B11/105
摘要： PROBLEM TO BE SOLVED: To provide a method and a device for reproducing information recorded in a magneto-optical recording medium in which a life of a light source can be prevented to shorten by enlarging power of a reproduced laser beam only when recorded information is reproduced. SOLUTION: In a reproducing method of information recorded in a magneto- optical recording medium having a magneto-optical recording section which can reproduce information with resolution being higher than optical resolution decided by size of a beam spot formed on a magneto-optical recording medium by irradiation of a reproduced laser beam and a pre-format section, reproduced laser beam power when information recorded in the magneto-optical recording section is reproduced is made larger than reproduced laser beam power when information of the pre-format section is reproduced and laser beam power during standby.

7. 发明专利

JPH1139670A OPTICAL DISK DEVICE 失效
公开(公告)号：JPH1139670A
公开(公告)日：1999-02-12
申请号：JP19163297
申请日：1997-07-16
申请人： FUJITSU LTD
发明人： NAKAO YOSHIHIRO , IZUMI HARUHIKO
IPC分类号： G11B7/09
摘要： PROBLEM TO BE SOLVED: To perform stable focus tracking control in an optical disk device capable of coping with a plurality of optical disk media different in substrate thickness by using an objective lens having a plurality of focal points. SOLUTION: For generating a focus control signal (AGCFES) and a tracking control signal (AGCTES) by an AGC circuit 27 based on the light receiving signal of a 4-division light detector 9 for receiving a reflected light from an optical disk medium 5, a gain coefficient to be used is selected by an MPU 28 according to the focal point of a used objective lens 4. If a reflected light quantity ratio between different focal points is a:b, a gain coefficient ratio between the different focal points is b:a.

8. 发明专利

JPH10255316A OPTICAL HEAD 失效
公开(公告)号：JPH10255316A
公开(公告)日：1998-09-25
申请号：JP6149797
申请日：1997-03-14
申请人： FUJITSU LTD
发明人： IZUMI HARUHIKO
IPC分类号： G11B7/135
摘要： PROBLEM TO BE SOLVED: To enable one optical head to reproduce or record/reproduce a data of an optical disk in accordance with its kind of recording density by changing a ratio D/W of a diameter W of a collimated light beam to be incident upon an objective lens to an effective diameter D of the objective lens in accordance with high or low recording density of the optical disk. SOLUTION: The collimated light beam transmitted through a beam splitter 4 is splitted by 4-th beam splitter 16, and a splitted collimated light beam reflected in the perpendicular direction is enlarged in diameter via a mirror 17 by a beam diameter converting optical system 18, while the other splitted collimated light beam transmitted in the straight direction is not changed in diameter as it is. The objective lens 5 is moved in accordance with the low recording density optical disk 6 to be recorded/reproduced and the high recording density optical disk 19 to be reproduced, and a vignetting coefft. D/W is changed over to 0.93 and 0.4 respectively. Reproducing data of the high recording density optical disk 19 such as the DVD and recording/reproducing data of the low recording density optical disk 6 such as the M0 can be carried out by the same one optical head in a magneto-optical disk device.

9. 发明专利

JPH0973680A OPTICAL RECORDING MEDIUM AND ITS RECORDING/REPRODUCING METHOD 失效
公开(公告)号：JPH0973680A
公开(公告)日：1997-03-18
申请号：JP25639495
申请日：1995-10-03
申请人： FUJITSU LTD
发明人： MORIBE MINEO , IZUMI HARUHIKO , TAGUCHI MASAKAZU , TSUGAWA IWAO
IPC分类号： G11B11/10 , G11B7/00 , G11B7/004 , G11B7/0055 , G11B7/013 , G11B7/24 , G11B7/26 , G11B7/30 , G11B11/105 , G11B19/02 , G11B20/00 , G11B23/28 , G11B23/36 , G11B19/04
摘要： PROBLEM TO BE SOLVED: To prevent an unfair copy by recording a nonvolatile mark. SOLUTION: For instance, the nonvolatile mark is formed by a circumferential speed of a disk 1.0m/sec., recording light power Pw 15.9mW, external magnetic field in the erasure direction Hw-300Oe and at recording density 0.78μm/ mark, and a medium identification code is pit position recorded. When this magneto-optical disk is recorded/reproduced, the unfair copy is prevented by executing the erasure operation of the medium identification code.

10. 发明专利

JPH0773520A MAGNETO-OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH0773520A
公开(公告)日：1995-03-17
申请号：JP21870893
申请日：1993-09-02
申请人： FUJITSU LTD
发明人： TANAKA TSUTOMU , IZUMI HARUHIKO , IKETANI TOMONORI , SHONO KEIJI
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To obtain a magneto-optical recording medium producing a satisfactory magneto-optical effect even if a laser beam for recording has wavelength in a relatively wide wavelength range from long wavelength to short wavelength and capable of controlling jitter and edge shift to a low value each. CONSTITUTION:This magneto-optical recording medium has a transparent substrate 1, a 1st dielectric layer 2 disposed on the substrate 1, a magnetic layer 3 disposed on the 1st dielectric layer 2, a 2nd dielectric layer 4 disposed on the magnetic layer 3 and a reflecting layer 5 disposed on the 2nd dielectric layer 4 and the magnetic layer 3 is made of a compsn. modified material.

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