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公开(公告)号：DE68912542D1
公开(公告)日：1994-03-03
申请号：DE68912542
申请日：1989-11-27
Applicant: IBM
Inventor： FUKUNAGA SEIJI , NAKAMURA TAKASHI , ONO HIROYUKI
IPC: G01P3/44 , G01P3/489 , G11B19/247 , G11B19/28
Abstract: A pulse generator includes an optical or magnetic pattern (8) provided on a rotor (4) of a motor and a sensor (12) detecting the movement of the pattern due to the rotation of the motor. Means (18, 20, 22) are provided for generating pulses following the rotational characteristics, such as wow and flutter components of the motor and for eliminating sensor errors and pattern errors.
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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：DE68912542T2
公开(公告)日：1994-06-30
申请号：DE68912542
申请日：1989-11-27
Applicant: IBM
Inventor： FUKUNAGA SEIJI , NAKAMURA TAKASHI , ONO HIROYUKI
IPC: G01P3/44 , G01P3/489 , G11B19/247 , G11B19/28
Abstract: A pulse generator includes an optical or magnetic pattern (8) provided on a rotor (4) of a motor and a sensor (12) detecting the movement of the pattern due to the rotation of the motor. Means (18, 20, 22) are provided for generating pulses following the rotational characteristics, such as wow and flutter components of the motor and for eliminating sensor errors and pattern errors.
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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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Patent Agency Ranking
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：JP2002217281A
公开(公告)日：2002-08-02
申请号：JP2000398281
申请日：2000-12-27
Applicant: IBM
Inventor： NAKAMURA TAKASHI
IPC: H01L21/76 , H01L21/205 , H01L21/31
Abstract: PROBLEM TO BE SOLVED: To provide a method and device for intermittently forming an even CVD film with no void, related to a trench isolation for element separation. SOLUTION: A reliable semiconductor device is manufactured by comprising a first process where a semiconductor substrate on which an insulating film is formed is prepared on a semiconductor base board, a second process where the insulating film of a region for an element separation and the semiconductor base board are etched to form a trench in the semiconductor substrate, and a third process where the trench is filled with the CVD film by a CVD method wherein source gas is guided into a system in which the semiconductor substrate is provided to form the CVD film.
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公开(公告)号：JPH09167457A
公开(公告)日：1997-06-24
申请号：JP33025695
申请日：1995-12-19
Applicant: IBM
Inventor： KITAZAKI NOBUYUKI , OGASAWARA KENJI , MASUDA YOSHIMI , NAKAMURA TAKASHI , YANAGISAWA HIROSHI
Abstract: PROBLEM TO BE SOLVED: To improve the performance by forming a data track in a spiral state with the use of the servo area arranged in the peripheral direction of a disk at every specified space and unnecessitating the seek operation for the movement between tracks in the reading/writing operation for continued data. SOLUTION: The constitution is made in such a manner that the target value of a PES(position error signal) obtained from servo signals which are buried on the track with the specified spaces, is successively changed for realizing the spiral track by reading the PES which is the conventional servo information. In the case of the disk device performing the positional control with the PES obtained from each servo area in the disk which is provided with the servo area of 60 pieces per one round of the disk, when the values available for the PES as the information on each position in the width direction of one track are taken as 256 kinds, the positional control of the head is executed by the value set by succesively shifting the target value of PES for every 256/60 track position in each of 60 servo positions. By such a positional control, the head is moved in accordance with the target PES values different for every servo area, thereby, the spiral track is followed up.
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公开(公告)号：JPH0991906A
公开(公告)日：1997-04-04
申请号：JP24626395
申请日：1995-09-25
Applicant: IBM
Inventor： YONEDA ISAO , KISAKA MASASHI , YOKOE YUJI , KITAZAKI NOBUYUKI , NAKAMURA TAKASHI
Abstract: PROBLEM TO BE SOLVED: To prevent an error caused by disc shift by performing connection to the head position control means for filter means depending on the determined amount of disc shift. SOLUTION: Filter table of a head A is prepared by performing a flow for the turn on of power. A filter is turned on and a microcode on a disc is read out. In this regard, a filter is used based on a prepared table. A preset shift criterion is read out and the read head is changed to a head B. Preparation of a filter table for the head B is then started and a table is prepared for the table. If an error occurs during preparation of the table to cause a time-out, 0 is written on the table thus preparing a table. Subsequently, a maximum value of stable variable X is searched on the table and the shift state is discussed for every head. The shift state is discussed based on the table and if not a11=0 on the table, it is judged that the table is prepared normally.
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公开(公告)号：JPH0945023A
公开(公告)日：1997-02-14
申请号：JP19010995
申请日：1995-07-26
Applicant: IBM
Inventor： OGASAWARA KENJI , NAKAMURA TAKASHI , MATSUBARA NOBUYA , NAKAGAWA YUZO , KIGAMI YUJI , UCHIIKE HIROSHI , NUMATA TSUTOMU
Abstract: PROBLEM TO BE SOLVED: To prevent servo information from being reproduced of error and to form correct servo information, by providing a plurality of bit patterns which are not prevent principally in other servo areas than a servo start mark SSM. SOLUTION: A cylindrical support 16 is set to a shaft 12, with having one or more data-recording discs 18A, 18B loaded at an outer peripheral face thereof. A data area 52 is formed in each recording face of the discs 18A, 18B. Servo areas 50 are radially formed in the data area. A start position of the servo area is indicated by a servo start mark SSM. A plurality of bit patterns in the signal SSM are constituted so as not to be read in other servo areas, i.e., a gray code area, a sector area and a position error signal PES area. Therefore, the SSM signal is never read out in the other servo areas, and reading errors and prevented.
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