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公开(公告)号：CA2349598A1
公开(公告)日：2000-06-02
申请号：CA2349598
申请日：1999-05-10
Applicant: IBM
Inventor： OKADA KENJI , TAKEUCHI KOICHI , OHZEKI HIDEKI
Abstract: A disk drive, method of producing the same, and disk drive controller are provided with little increase of cost at an improved yield. An HDC (20) find s the current position of a head (2) to perform track following control based on the reproduction output of a servosector from a channel (5) and performs computation about servo data by using an integration parameter corresponding to the target track which is read and stored in a RAM (1) and the current position of the head (2).
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公开(公告)号：SG65734A1
公开(公告)日：1999-06-22
申请号：SG1998000316
申请日：1998-02-12
Applicant: IBM
Inventor： TSUDA SHINGO , DALE GOEKE , TAKEUCHI KOICHI , KOBAYASHI MASAKI
IPC: G11B5/60 , G11B5/48 , G11B5/55 , G11B21/02 , G11B21/21 , H05K1/18 , G11B25/04 , G11B5/00 , G11B21/00
Abstract: An FPC cable which is excellent in noise resisting property, manufacturing cost, mounting operability to a carriage, and maintenance. The FPC cable includes a spacer and a reinforcing plate. In the patterned surface of the FPC, a head pad to which a head wire is bonded is formed on a pad forming portion and a preamplifier chip is mounted on a device mounting portion. Wiring patterns are linearly connected between the head pad and the preamplifier chip and between the preamplifier chip and an I/O-side end portion, respectively. In the spacer, a cavity is formed for storing the preamplifier chip. The reinforcing plate is inserted into the space formed by folding back the pad forming portion, and the spacer is engaged with the device mounting device, thereby constituting a magnetic-head-side end portion.
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公开(公告)号：JP2001099147A
公开(公告)日：2001-04-10
申请号：JP27022899
申请日：1999-09-24
Applicant: IBM
Inventor： MATSUZAKI SHINICHI , OYAMA AKIHIRO , TAKEUCHI KOICHI , SATO KIYOSHI
Abstract: PROBLEM TO BE SOLVED: To solve a problem that, when a ceramic ball is used as a rolling body of a bearing used in bearing mechanism, an unstable factor such as excessive preload and preload loss is caused so that working temperature condition is limited, since a ceramic member has a low linear expansion coefficient against the other member, although it is desired to use ceramic for durability and vibration resistance. SOLUTION: With respect to a shaft 34 (stainless steel) for retaining inner rings 33a, 34a of a pair of bearings 33, 34, a sleeve 40 (aluminum) is formed of a member having a high linear expansion coefficient to retain outer rings 33b. A change rate of a temperature of a distance X between the outer rings 33b is made to be higher than that of a distance Y between the inner rings 33a, 34a, so that difference of change in dimension of the inner rings 33a, 34b, outer rings 33b, and a rolling body is compensated by difference of change in dimension of a distance between the bearings.
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公开(公告)号：JP2002170345A
公开(公告)日：2002-06-14
申请号：JP2000363528
申请日：2000-11-29
Applicant: IBM
Inventor： OTA MUTSURO , TAKEUCHI KOICHI , TAKAHASHI HIROSHI , FUUIN FAN
Abstract: PROBLEM TO BE SOLVED: To provide a head assembly capable of adjusting the center of gravity of the head assembly of a Depopulation version while suppressing the occurrence of a resonance frequency that affects the performance of a disk drive device. SOLUTION: This head assembly 6 that moves on a data storage medium by swinging movement consists of magnetic heads 11c and 11d for reading/ writing data from/to a data storage medium, arms 9a to 9c for attaching the magnetic heads 11c and 11d, a pivot shaft holder 7 for supporting the arms 9a to 9c, a coil 8 for a VCM extending from the holder 7 and a counter weight 15 provided at a prescribed position that is the side opposite to the coil 8 for a VCM with respect to the holder 7.
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公开(公告)号：JP2002133743A
公开(公告)日：2002-05-10
申请号：JP2000326417
申请日：2000-10-26
Applicant: IBM
Inventor： KOYANAGI ICHIRO , NAKAMOTO TATSUO , TAKEUCHI KOICHI
IPC: G11B23/00 , G11B17/028 , G11B17/038
Abstract: PROBLEM TO BE SOLVED: To provide a disk clamp hardly causing a dislocation on the data positions in a recording track and letting the distribution of the data positions concentrate near a central position even after a temperature cycle is implemented. SOLUTION: The material used for forming a top clamp 31 and a hub 23 is physically stable in all the temperature region in which this information recording disk device is assumed to be used and has such an elastic coefficient that the fastening force required to fix a recording disk 17 when the information recording disk device is used is available from the fastening force for fixing screws 22. The material of at least one of the top clamp 31 and the hub 23 has a coefficient of thermal expansion close to that of the recording disk 17.
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Patent Agency Ranking
公开(公告)号：JP2002093118A
公开(公告)日：2002-03-29
申请号：JP2000274041
申请日：2000-09-08
Applicant: IBM
Inventor： OTA MUTSURO , TSUDA SHINGO , TAKEUCHI KOICHI , DALE GEEKI
Abstract: PROBLEM TO BE SOLVED: To provide a disk drive which can reduce the flow velocity of an airstream generated near a magnetic disk during the rotation of the magnetic disk in a HDD having a high rotational speed, that is, can restrict the occurrence of a flutter. SOLUTION: The interval between magnetic disks 22b and 22c located in the center in the axial direction among a plurality of magnetic disks 22a, 22b, 22c, and 22d is set more largely than the interval between other magnetic disks 22a and 22b and the interval between 22c and 22d.
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公开(公告)号：JP2002170373A
公开(公告)日：2002-06-14
申请号：JP2000365850
申请日：2000-11-30
Applicant: IBM
Inventor： HIRASAKA YOSHIHIRO , KOYANAGI ICHIRO , TAKEUCHI KOICHI
Abstract: PROBLEM TO BE SOLVED: To lessen the burden of positioning work in fitting a top cover with a breather filter and to prevent remaining of an adhesive in removing the breather filter from the top cover. SOLUTION: The breather filter 14 is passed through a through-hole of the top cover 3. A flange 15c is formed at the breather filter 14 and this flange 15c is detained to a chamfer 3b of the top cover 3. The breather filter 14 is fixed to the top cover 3 form the outer peripheral surface side of the top cover 3 by a one-side adhesive tape 19.
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公开(公告)号：JP2003151226A
公开(公告)日：2003-05-23
申请号：JP2001344497
申请日：2001-11-09
Applicant: IBM
Inventor： MURAKI TAKUMA , TAKEUCHI KOICHI , TSUDA SHINGO
Abstract: PROBLEM TO BE SOLVED: To provide a disk driver which can make the efficiency of a manufacturing process step higher, the cost lower and the space less and a hard disk drive. SOLUTION: The rotational movement of an actuator 30 to its inner peripheral side and the rotational movement of the actuator 30 to its outer peripheral side are regulated by a stopper 50 arranged between coil holding arms 34A and 34B of the actuator 30 and the holding of a magnetic head 32 of the actuator 30 on a lamp 13 is made possible by a magnet built into the stopper 50.
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公开(公告)号：JP2001023347A
公开(公告)日：2001-01-26
申请号：JP18304999
申请日：1999-06-29
Applicant: IBM
Inventor： HASHIZUME MASATAKA , KAKIZAKI YOSHITAKA , NAKAMOTO TATSUO , TAKEUCHI KOICHI
Abstract: PROBLEM TO BE SOLVED: To provide a hard disk device which is capable of straightening air flow between disks and suppressing vibrations of the disks and actuators, and an air flow straightening blade used in the device. SOLUTION: The hard disk device 1 of this invention consists of a housing 2, the plural disks 3 which are housed rotatably in the state of being stacked in the housing 2 and the actuators 5 which are housed movably with respect to the surface of the disks 3 in the housing 2 and have data read/write head 4 at the tip thereof. In the hard disk device 1, the air flow straightening blades 6 which are streamlined in cross section are disposed while leaving a specified interval just behind the down stream side in rotational direction of the disks with respect to the moving position of the head 4 on the disks 3. Further, in order to complete the hard disk device 1, the air flow straightening blades 6, which are constituted by erecting plural plate-like bodies having streamlined cross section on a substrate 11 in such a manner that the streamlined cross section becomes parallel with the substrate 11, are utilized.
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公开(公告)号：JPH10241133A
公开(公告)日：1998-09-11
申请号：JP4532797
申请日：1997-02-28
Applicant: IBM
Inventor： TSUDA SHINGO , DILL GEEKI , TAKEUCHI KOICHI , KOBAYASHI MASAKI
Abstract: PROBLEM TO BE SOLVED: To provide an FPC cable having advantageous noise-resisting performance, manufacturing costs, mount workability to a carriage and maintenance efficiency. SOLUTION: The FPC cable is comprised on an FPC 11, a spacer and a reinforcing plate. A head pad 102 where a head wire is bonded is formed at a pad formation part A of a pattern face 100a of the FPC 11. A preamplifier chip 101 is mounted to an element-mounting part B. The head pad 102 and preamplifier chip 101, and the preamplifier chip 101 and an end part at the side of an I/O are respectively linearly connected by wiring patterns 105a, 105b. A gap is formed in the spacer to store the preamplifier chip 101. The pad formation part A is folded to insert the reinforcing plate, and the spacer is engaged to the element-mounting part B, whereby an end part at the side of a magnetic head is constituted.
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