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公开(公告)号：DE69602486D1
公开(公告)日：1999-06-24
申请号：DE69602486
申请日：1996-03-26
Applicant: IBM
Inventor： NAKAMURA TAKASHI , YONEDA ISAO , YOKOE YUJI , TSUWAKO KAZUSHI , HARAKO FUJIO , SUDA KATSUMI , NAKAJIMA MICHIO , OGASAWARA KENJI
Abstract: The present invention provides a disk drive apparatus which detects when a signal transducer head contacts a projection, forming a thermal asperity on the recording surfaces of disks, makes the flying height of the signal transducer head lower by changing the rotation speed from the normal rotation speed in read/write operations or by transforming a suspension having a bimetal structure while said signal transducer head is positioned over the detected projection on the track, and makes the signal transducer head strike against the projection to break the projection.
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公开(公告)号：SG54970A1
公开(公告)日：1998-12-21
申请号：SG1995000636
申请日：1995-06-14
Applicant: IBM
Inventor： SUGAWARA TAKASHI , OGASAWARA KENJI , SATOH KENICHIROH
Abstract: A target PES value input from a controller and a value from a PES value calculator which corresponds to the displacement of a magnetic head are synthesized. A coefficient applicator applies a predetermined coefficient K1 to the above deviation (multiplication), and a variable coefficient applicator applies a coefficient Ka to the resulting value. The coefficient Ka is varied and set in the variable coefficient applicator in accordance with a value input from a table. The correspondence between the target PES value and the coefficient Ka used as a feedback coefficient for the PES value is stored in the table in advance so that the coefficient Ka is small when the PES value varies sharply and so that the coefficient Ka is large when the PES value is small. The variable coefficient applicator outputs, to a driver, a value to which the coefficient Ka has been applied in accordance with the value from the table.
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公开(公告)号：GB2285165A
公开(公告)日：1995-06-28
申请号：GB9425465
申请日：1994-12-16
Applicant: IBM
Inventor： NAKAMURA TAKASHI , NUMATA TSUTOMU , OGASAWARA KENJI , KIGAMI YUJI , KURACHI KOJI , OKADA MAYUMI , MATSUI TAKAO , YOKOE YUJI
Abstract: A disk drive apparatus comprising a disk recording medium in which each track is divided into a servo area which stores information for identifying the track position and a plurality of data sectors wherein at least one of said data sectors crosses said servo area and a look-up table is provided for identifying the position of each sector based upon the relationship between a physical sector identifier, said position information and the capacity of the sector crossing said servo area. When a signal SP at the end of a servo area is detected in a dead state 80 during start up, a first data state 84 for the start of a sector transits to a second data state 86 for the later region of the sector being divided in accordance with the capacity stored in a current sectors pointer register 60. At the beginning of the sector, the contents of a next sectors pointer register 62 is stored in register 60 and the contents of a next sectors operation register 66 is stored in a current sectors operation register 64. Upon completion of sector processing, the first data state 84 is maintained when the next sector is contiguous. When a terminate instruction is stored in register 64, the process moves to dead state 80. When the servo area arrives, the process moves to idle state 82. Responsive to this state, the magnetic head is activated to enable read and write operation 5 for sectors having no sector ID on the disk.
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公开(公告)号：DE69018917D1
公开(公告)日：1995-06-01
申请号：DE69018917
申请日：1990-09-28
Applicant: IBM
Inventor： OGASAWARA KENJI , KURACHI KOJI , TOBARI ATUSHI
Abstract: A magnetic data storage apparatus employs a magnetic head which has a non-magnetic gap member (3) disposed in a magnetic body (1, 2) with positive magnetostriction constant. During reading of data from a recording medium by a coil (4) wound around the magnetic body, a dc bias magnetic field is caused to be generated in the magnetic body. This field causes a magnetostriction effect in the magnetic body which compresses the gap member thereby cancelling the tensile stress generated by the expansion rate difference between gap member and magnetic body.
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公开(公告)号：DE69018917T2
公开(公告)日：1995-11-23
申请号：DE69018917
申请日：1990-09-28
Applicant: IBM
Inventor： OGASAWARA KENJI , KURACHI KOJI , TOBARI ATUSHI
Abstract: A magnetic data storage apparatus employs a magnetic head which has a non-magnetic gap member (3) disposed in a magnetic body (1, 2) with positive magnetostriction constant. During reading of data from a recording medium by a coil (4) wound around the magnetic body, a dc bias magnetic field is caused to be generated in the magnetic body. This field causes a magnetostriction effect in the magnetic body which compresses the gap member thereby cancelling the tensile stress generated by the expansion rate difference between gap member and magnetic body.
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Patent Agency Ranking
公开(公告)号：DE69602486T2
公开(公告)日：1999-12-09
申请号：DE69602486
申请日：1996-03-26
Applicant: IBM
Inventor： NAKAMURA TAKASHI , YONEDA ISAO , YOKOE YUJI , TSUWAKO KAZUSHI , HARAKO FUJIO , SUDA KATSUMI , NAKAJIMA MICHIO , OGASAWARA KENJI
Abstract: The present invention provides a disk drive apparatus which detects when a signal transducer head contacts a projection, forming a thermal asperity on the recording surfaces of disks, makes the flying height of the signal transducer head lower by changing the rotation speed from the normal rotation speed in read/write operations or by transforming a suspension having a bimetal structure while said signal transducer head is positioned over the detected projection on the track, and makes the signal transducer head strike against the projection to break the projection.
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公开(公告)号：SG46480A1
公开(公告)日：1998-02-20
申请号：SG1996004997
申请日：1994-12-16
Applicant: IBM
Inventor： NAKAMURA TAKASHI , MUMATA TSUTOMU , OGASAWARA KENJI , KIGAMI YUJI , KURACHI KOJI , OKADA MAYUMI , MATSUI TAKAO , YOKOE YUJI
Abstract: A disk drive having embedded servo information accesses data without using sector identifier recorded in each sector. When a signal sector pulse signal (SP) at the end of a servo area is detected in a dead state during start up, a first data state for the start of a sector transits to a second data state for the litter region of the sector being divided in accordance with the capacity stored in a current sector's pointer register. At the beginning of the sector, the contents of a next sector's pointer register is stored in current sector's pointer register and the contents of a next sector's operation register is stored in a current sector's operation register. Upon completion of sector processing, the first data state is maintained when the next sector is contiguous. When a terminate instruction is stored in current sector's operation register, the process moves to dead state. When the servo area arrives, the process moves to idle state. Responsive to this state, the magnetic head is activated to enable read and write operation for sectors having no sector identifier on the disk.
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公开(公告)号：JPH1145405A
公开(公告)日：1999-02-16
申请号：JP20290297
申请日：1997-07-29
Applicant: IBM
Inventor： OGASAWARA KENJI , YANAGISAWA HIROSHI , KOBAYASHI KEIJI
Abstract: PROBLEM TO BE SOLVED: To reduce the range of fluctuations of feedback signals to a hard disk device by providing first and second data recording surfaces on a data recording disk and making the track pitch between adjacent data recording tracks of the first recording surface and the track pitch between adjacent data tracks of the second recording surface different. SOLUTION: A head #1 moves by a distance D=(Hw+Gw)/2 from a position P4 to a position P5 to write servo patterns A5 and B5 by respectively overlapping them. The head #1 moves by the distance D=(Hw+Gw)/2 toward the most outside position of the data recording surface to write new servo patterns at respective positions. The counter being in a hard disk control circuit or an MPU counts the number of movings of the distance D=(Hw+Gw)/2 of the head #1 in the radial direction to store it in a memory and, thus, the number of servo tracks written on the recording surface can be known.
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公开(公告)号：JPH1116267A
公开(公告)日：1999-01-22
申请号：JP17056697
申请日：1997-06-26
Applicant: IBM
Inventor： YONEDA ISAO , UCHIIKE HIROSHI , UENO SHINJI , OGASAWARA KENJI
Abstract: PROBLEM TO BE SOLVED: To provide a disk drive device, a loading/unloading device and its control method wherein data reliability is increased by performing stable speed control. SOLUTION: A disk drive device 10 is provided with a VCM spindle driver 12 for rotary-driving a disk 11, an actuator mechanism 14 for moving a head slider having a magnetic head 13 above the surface of a magnet disk 11 and to a retreating position, a lamp block 15 and a CPU/HDC 16 for controlling operations including loading/unloading control, control for the speed of the actuator or data reading/writing in the disk 11. Before performing speed control for loading the actuator on a recording medium, a proper rectangular current wave is first applied so as to release the actuator from its static state by an open loop, then the movement of the actuator caused by the application of the rectangular current wave is immediately measured, whether a proper initial speed is obtained or not is determined and, when a proper initial speed is not obtained, a rectangular current wave is applied again and then the initial condition of speed control is decided based on the measuring result.
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公开(公告)号：JPH1116259A
公开(公告)日：1999-01-22
申请号：JP16729697
申请日：1997-06-24
Applicant: IBM
Inventor： UCHIIKE HIROSHI , OGASAWARA KENJI , AMANO YOSHIRO , SHIMIZU MASAHIRO , KURIHARA SHUSUKE , TSUCHIMOTO KAZUNARI , KITAZAKI NOBUYUKI , UENO SHINJI , YONEDA ISAO , YOKOE YUJI , SAI FUMINORI
Abstract: PROBLEM TO BE SOLVED: To prevent a head slider from accidentally landing. SOLUTION: The head slider provided with a transducer head is mounted on a head arm of the head mechanism and loaded on a disk by the turning of the head arm and also unloaded to the retreating position out of the disk from on the disk. A shock sensor is provided for sensing the shock received by the head mechanism from the outside. The loading operation of the head slider is started at a step S2, and when the shock is sensed at a step S3 during the loading operation, the loading is stopped at a step S5 and the unloading is carried out at a step S6 to return the head slider to the retreating position. When the unloading operation at the step S6 is finished, the head slider is returned to the step S2 and the reloading is started.
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