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11. 发明专利

JPH03189918A MAGNETIC DISK DEVICE, MAGNETIC HEAD AND ITS POSITIONING CONTROL SYSTEM 失效
公开(公告)号：JPH03189918A
公开(公告)日：1991-08-19
申请号：JP32890589
申请日：1989-12-19
申请人： HITACHI LTD
发明人： AOI MOTOI , SEO YOSUKE , AKAGI KYO
IPC分类号： G11B5/596 , G11B5/265
摘要： PURPOSE:To control the correct positioning of a magnetic head and to make the density of a track high by giving an azimuth angle to a signal between the adjacent tracks, executing the recording and reproducing of the signal by using a recording and reproducing separation head, simultaneously reproducing the signal by a reproducing head and controlling the positioning of the head. CONSTITUTION:A pair of heads 8 respectively provided with the azimuth angle is loaded and the respective heads 8 are provided with a recording head element 5 and a reproducing head element 4. Then, a reproducing action can be always executed. When only recording and reproducing data is recorded, the recording and reproducing data on the identical track is separated and reproduced by the left and right elements 4. A positioning signal is obtained from the difference of amplitude between signals from two elements 4. Then, the positioning with high accuracy is executed by controlling the positioning signal so as to be zero. Thus, since the positioning signal can be reproduced in parallel with a recording and reproducing action, the positioning can be always controlled. As the result, the density of the track is made high.

12. 发明专利

JPH03142707A POSITIONING SYSTEM FOR DISCRETE MEDIUM AND MAGNETIC STORAGE 失效
公开(公告)号：JPH03142707A
公开(公告)日：1991-06-18
申请号：JP27859589
申请日：1989-10-27
申请人： HITACHI LTD
发明人： AKAGI KYO , FUTAMOTO MASAAKI , KUGIYA FUMIO , MIYAMURA YOSHINORI , TAKANO KOJI , MATSUDA YOSHIFUMI , SUZUKI MIKIO , NAKAO TAKESHI , MUNEMOTO TAKAYUKI , FUKUOKA HIROTSUGU , AIHARA MAKOTO
IPC分类号： G11B5/82 , C09D5/23 , C09D7/12 , G11B5/596 , G11B5/64 , G11B5/65 , G11B5/73 , G11B25/04
摘要： PURPOSE:To exactly execute positioning with simple head configuration by recording data to the projecting part of a discrete medium, recording servo information to the recessed part and executing positioning based on the servo information by one head. CONSTITUTION:In an uneven shape regularly formed in a direction orthogonal to the advancing direction of recording information on the surface of the recording medium, magnetic layers are provided on the surface of the projecting part and on the bottom of the recessed part at least, the recording data are recorded to projecting parts 1a-1d and the positioning servo information are recorded to recessed parts 2a-2d. When the information are read from a prescribed data track, positioning and setting is executed based on the servo information in the recessed parts 2a-2d of the medium at first. Then, frequency separation is executed for data signals and servo signals and at the time of following, the data signals and the servo signals are simultaneously taken out and separated. Afterwards, the data are read simultaneously with positioning at the time of track following. Thus, highly accurate positioning can be executed with the simple head configuration.

13. 发明专利

JPH03113854A RECORDING AND REPRODUCING METHOD 失效
公开(公告)号：JPH03113854A
公开(公告)日：1991-05-15
申请号：JP24912889
申请日：1989-09-27
申请人： HITACHI LTD
发明人： KUGIYA FUMIO , SUZUKI MIKIO , AKAGI KYO , NAKAO TAKESHI , FUTAMOTO MASAAKI , MIYAMURA YOSHINORI , TAKANO KOJI , MATSUDA YOSHIFUMI
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To improve the output of a reproduced signal by arranging a soft magnetic film on and under a recoding film and carrying out magnetic recording and light reproduction. CONSTITUTION:The recording medium 1 is formed by a substrate 11, a soft magnetic film 12, a perpendicular magnetic film 13, a soft magnetic film 14 and a protective film 15. Recording is performed by a recording single-magnetic- pole head 2, and reproduction is conducted by a reproducing optical head 3 from the same side as the head 2. The reproducing light 31 is transmitted through the protective film 15 and soft magnetic film 14, reflected by the surface of the magnetic film 13 and subjected to the Kerr effect, and the rotation of the polarized light is detected to regenerate magnetization. Consequently, light reproduction is conducted while the residual magnetization of the film 13 is kept high, and the reproduced output is improved.

14. 发明专利

JPH0340219A MAGNETIC DISK AND PRODUCTION THEREOF 失效
公开(公告)号：JPH0340219A
公开(公告)日：1991-02-21
申请号：JP17295989
申请日：1989-07-06
申请人： HITACHI LTD
发明人： MIYAMURA YOSHINORI , KIRINO FUMIYOSHI , FUTAMOTO MASAAKI , TAKANO KOJI , MATSUDA YOSHIFUMI , KUGIYA FUMIO , AKAGI KYO , SUZUKI MIKIO , NAKAO TAKESHI
IPC分类号： G11B5/82 , G11B5/64 , G11B5/65 , G11B5/73 , G11B5/738 , G11B5/84
摘要： PURPOSE:To increase a memory capacity and to attain a high-density recording by providing guide patterns for tracking on a recording film. CONSTITUTION:The recording film 12 consisting of an Fe-Co alloy is stuck by a sputtering method onto a disk substrate 11 and a resist film 3 for use at the time of mask formation is formed by a spin coating method thereon. The patterns of guide grooves 4 are formed on the resist film 3 when the resist film is exposed by using a mask 5 and is developed. The recording film 12 is thereafter etched by a nitric acid soln. to form the guide grooves 4 and the nitric acid is completely washed away. The magnetic disk 13 with the guide grooves is then obtd. when the resist film 3 is removed. The precise movement of the magnetic head for recording and reproducing of information along the guide patterns for tracking is thereby enabled and, therefore, the diminishing of the track pitch is possible. A large quantity of the information is recordable on a sheet of the magnetic disk in this way.

15. 发明专利

JP2003217264A RECORDING AND REPRODUCING DEVICE 审中-公开
公开(公告)号：JP2003217264A
公开(公告)日：2003-07-31
申请号：JP2002010530
申请日：2002-01-18
申请人： HITACHI LTD
发明人： ODAI MASAKI , AKAGI KYO , YAMAGUCHI TAKASHI
IPC分类号： H04N5/765 , G11B20/10 , G11B27/00 , H04N5/781
摘要： PROBLEM TO BE SOLVED: To make efficient use of the storage capacity of a recording and reproducing device by automatically discriminating the degree of importance of data stored on the recording and reproducing device and by automatically erasing the data in accordance with foregoing automatic discrimination. SOLUTION: The recording and reproducing device comprises: a data obtaining unit 100 for capturing data; a feature extraction means 107 for preparing key information representing the feature of the captured data; a recorder 108 for recording the captured data and the key information on the data; a reproducing means 113 for outputting the data recorded on the recorder 108; an erasing means 120 for erasing the data recorded on the recorder 108; and a means for evaluating the degree of importance 119 for judging the degree of importance of each recorded data to output the degree of importance to the erasing means 120. The erasing means 120 erases the data when the degree of importance outputted from the means 119 is equal to or lower than the previously established threshold value and allows the key information on the data to leave behind without erasure. COPYRIGHT: (C)2003,JPO

16. 发明专利

JP2002157814A MAGNETIC DISK DEVICE 失效
公开(公告)号：JP2002157814A
公开(公告)日：2002-05-31
申请号：JP2001031691
申请日：2001-02-08
申请人： HITACHI LTD
发明人： AKAGI KYO , YAMAGUCHI TAKASHI , UEFUNE KOUKI , TSUNODA MOTOYASU , SAITO ATSUSHI
IPC分类号： G11B21/22 , G11B19/00 , G11B19/04 , G11B19/22 , G11B21/02 , G11B21/12
摘要： PROBLEM TO BE SOLVED: To solve the problem that a HDD incorporated in mobile PC and a portable information electric home appliance is damaged by falling and the like and that the spindle of the HDD is damaged by outer vibration and the like even at non-operation time. SOLUTION: When a recording/reproducing command or a seak command is not issued even in a state where a system is connected to a host device, possibility that the system is damaged can be reduced by fixing a movable part in the HDD for most of the time by providing a means for fixing a disk and a head to a electromagnetic latch. Thus, resistance to outer impact due to the drop of a mobile unit is high, the fault of the spindle by outer vibration at non-operation time can be avoided and therefore the loading rate of the HDD for mobile PC and the portable information electric home appliance increases.

17. 发明专利

JP2000268516A MAGNETIC RECORDER AND SERVO INFORMATION RECORDER 失效
公开(公告)号：JP2000268516A
公开(公告)日：2000-09-29
申请号：JP7376699
申请日：1999-03-18
申请人： HITACHI LTD
发明人： AKAGI KYO
IPC分类号： G11B5/596 , G11B21/10
摘要： PROBLEM TO BE SOLVED: To record a servo pattern not exceeding an erase area limit and improve the performance of a magnetic disk drive by permitting the existing of an unusable track area equivalent to one to several tracks at a place where the skew angle of a magnetic recording medium is a prescribed angle. SOLUTION: A servo pattern is recorded once in both a negative skew angle area 22 and a positive skew area 23 that are bounded by tracks 21 providing a skew angle of 0 degree in a magnetic disk 20. A magnetic head 24 starts recording of the servo pattern to the area 22 (23) from an outermost circumference (innermost circumference) of the magnetic disk 20 up to the tracks 21 and leaves track areas around the tracks 21, to which no servo pattern is recorded. Thus, the magnetic disk drive can process the magnetic disk 20 so that the magnetic disk 20 has a physical gap track area where no servo area is in existence and a logical gap track area that allows no substantial recording/ reproduction of data to data track areas around track areas providing a skew of 0 degree.

18. 发明专利

JP2000123506A MAGNETIC DISK DEVICE 失效
公开(公告)号：JP2000123506A
公开(公告)日：2000-04-28
申请号：JP29160498
申请日：1998-10-14
申请人： HITACHI LTD
发明人： SEO YOSUKE , INOUE TAKAHIRO , AKAGI KYO
IPC分类号： G11B21/10 , G11B19/247
摘要： PROBLEM TO BE SOLVED: To improve the positioning accuracy and the reliability of a write fault signal. SOLUTION: In the magnetic disk device of a sensor servo system, individual servo information is constituted of a pull-in area A, a track identification area B and a position signal/speed detection area C and the position signal/speed detection area C is made to be a constitution consisting of one pair of patterns C-1 and C-3 which are constituted so as to have prescribed azimuth angles of the same phase with respect to the circumferential direction of a track and the pattern C-2 which is held between them. Since the position signal/speed detection area C has the constitution in which phases of patterns C-1 and C-3 are the same phases and the pattern C-2 having the opposite phase is pushed in between them, a servo system detects position information from the phase between the C-1 part and the C-2 part or the C-1 part and C-3 part and detects speed information by observing the phase difference between the C-1 part the C-3 part from one piece of servo information in the same sector. Moreover, the write fault signal for recording is produced from the position information and the speed information in the same sector.

19. 发明专利

JPH1139633A MAGNETIC RECORDING MEDIUM AND ITS MANUFACTURE 失效
公开(公告)号：JPH1139633A
公开(公告)日：1999-02-12
申请号：JP18955797
申请日：1997-07-15
申请人： HITACHI LTD , HITACHI MAXELL
发明人： KIRINO FUMIYOSHI , INABA NOBUYUKI , AKAGI KYO , KOISO YOSHITSUGU , FUTAMOTO MASAAKI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/667 , G11B5/73 , G11B5/82 , G11B5/85 , G11B5/851
摘要： PROBLEM TO BE SOLVED: To generate an ununiform magnetic field usable as a positioning signal of a magnetic head without a servo track writer by making a lower surface shape of a magnetic film a rugged shape reflecting ruggedness of a resin substrate and making the ruggedness of the outermost a specified value or below, the period of the ruggedness a specified value or above regardless of the size of the ruggedness of the resin substrate. SOLUTION: Rugged pits 12 of a length 1-2 μm, a width 0.5 μm and a depth 80 nm are formed on the resin substrate 11 by a stamper method. A corrosive component interruption layer 13, an orientation property control layer 15, the magnetic film 16 and a protection film 17 are formed on this resin substrate 11 by an RF spatter method, and then, the vertical directional step of the ruggedness of the magnetic film 16 surface is made 3-4 μm extent, and the horizontal directional period is made 2-3 μm extent. Thus, by that a servo signal is recorded beforehand as the ruggedness of the bottom surface of the magnetic film 16, the servo signal of equal or above to the case when the servo track writer is used is obtained.

20. 发明专利

JPH10208230A MAGNETIC DISK AND MAGNETIC RECORDER USING SAME 失效
公开(公告)号：JPH10208230A
公开(公告)日：1998-08-07
申请号：JP1222397
申请日：1997-01-27
申请人： HITACHI LTD , HITACHI MAXELL
发明人： KIRINO FUMIYOSHI , INABA NOBUYUKI , AKAGI KYO , KOISO YOSHITSUGU , FUTAMOTO MASAAKI
IPC分类号： C23C14/14 , G11B5/66 , G11B5/73
摘要： PROBLEM TO BE SOLVED: To inhibit the abnormal growth of a magnetic film on a resin substrate and to obtain a magnetic disk having high performance and high reliability by controlling the surface energy of the face of the resin substrate on which the magnetic film is formed so that it is made equal to the surface energy of a glass substrate. SOLUTION: A silicon nitride layer is formed as a surface energy controlling layer 2 on a molded resin substrate 1. A Cr film as an under film 3, a Cr85 Ti15 alloy film as a film 4 controlling the orienting property of a magnetic film and a Co69 Cr19 Pt12 alloy film as a magnetic film 5 are successively formed on the controlling layer 2. A carbon film as a protective film 6 is finally formed. Even if the interval between a head and the resultant medium is narrowed to a certain degree, stable recording and reproduction can be performed without causing crashing. The thickness of the controlling layer 2 is regulated to 3-50nm.

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