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公开(公告)号：DE69513071D1
公开(公告)日：1999-12-09
申请号：DE69513071
申请日：1995-03-16
Applicant: IBM
Inventor： GARFUNKEL GLEN ADAM , SALO MIKE PAUL , AOYAGI AKIHIKO , YANAGISAWA HIROSHI , TERASHIMA HIROSHI , KUROKI KENJI
Abstract: In a disk drive actuator head stack assembly, magnetic transducers including magnetoresistive (MR) read heads are connected to a current source and configured to provide an MR sensor current to each MR head wherein the direction of current flow for the MR sensor current in each MR head is the same relative to the actuator for all of the MR heads in the actuator head stack. This configuration allows all of the MR heads in the head stack assembly to initialized simultaneously by applying a homogeneous magnetic field to the head stack assembly, thus providing the capability of initializing the MR heads at the actuator or disk drive level rather than requiring that the MR heads be initialized individually.
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公开(公告)号：SG28235A1
公开(公告)日：1996-04-01
申请号：SG1995000165
申请日：1995-03-25
Applicant: IBM
Inventor： AOYAGI AKIHIKO , TERASHIMA HIROSHI , YANAGISAWA HIROSHI , KUROKI KENJI
IPC: G11B5/127
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公开(公告)号：GB2266616B
公开(公告)日：1995-08-09
申请号：GB9307915
申请日：1993-04-16
Applicant: IBM
Inventor： KUROKI KENJI , HARADA YOSHINAO , OTA SHUNICHROH
Abstract: The inside wall of a head/disk enclosure is given a surface broad enough to adsorb and release easily a large amount of water vapor. In a first embodiment, the inside surface is treated by anodic oxidation using oxalic acid. In a second embodiment, the inside surface is treated with sodium carbonate and sodium chromate. In a third embodiment, the surface was etched with acid. The water adsorption capability acts as a buffer to prevent extremes of relative humidity within the enclosure.
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公开(公告)号：GB2266616A
公开(公告)日：1993-11-03
申请号：GB9307915
申请日：1993-04-16
Applicant: IBM
Inventor： KUROKI KENJI , HARADA YOSHINAO , OTA SHUNICHROH
Abstract: A disk drive comprising a head/disk enclosure 10, the inside wall 10c of which is given a larger surface area to adsorb and release water vapour sufficiently to maintain the relative humidity within the drive at a desired level. The surface area of the inside wall 10c is increased by chemical treatment, anodic oxidation or acid etching.
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公开(公告)号：DE69513071T2
公开(公告)日：2000-05-25
申请号：DE69513071
申请日：1995-03-16
Applicant: IBM
Inventor： GARFUNKEL GLEN ADAM , SALO MIKE PAUL , AOYAGI AKIHIKO , YANAGISAWA HIROSHI , TERASHIMA HIROSHI , KUROKI KENJI
Abstract: In a disk drive actuator head stack assembly, magnetic transducers including magnetoresistive (MR) read heads are connected to a current source and configured to provide an MR sensor current to each MR head wherein the direction of current flow for the MR sensor current in each MR head is the same relative to the actuator for all of the MR heads in the actuator head stack. This configuration allows all of the MR heads in the head stack assembly to initialized simultaneously by applying a homogeneous magnetic field to the head stack assembly, thus providing the capability of initializing the MR heads at the actuator or disk drive level rather than requiring that the MR heads be initialized individually.
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Patent Agency Ranking
公开(公告)号：JP2000231775A
公开(公告)日：2000-08-22
申请号：JP3312899
申请日：1999-02-10
Applicant: IBM
Inventor： KUROKI KENJI , ANDO KEIMEI
Abstract: PROBLEM TO BE SOLVED: To provide a breather filter having a structure, wherein a high-function breather filter is made thin by a high mass-production method. SOLUTION: This filter 1 is fixed in a hole 3 provided in the cover 2 of a hard disk drive(HDD). This filter 1 is constructed in such a manner that a first sheet 11 having a diffusion tube 12 formed in a position corresponding to the hole 3 provided in the cover 2 of the HDD, a second sheet 21 having an opening part 22 formed in a position corresponding to the diffusion tube 12 of the first sheet 11, a third sheet 31 having an adsorbing material layer 32 in a position corresponding to the opening part 22 of the second sheet 21, and a fourth sheet 41 composed of a filter layer for covering the adsorbing material layer 32 of the third sheet 31 are respectively prepared, and the prepared first to fourth sheets are laminated.
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公开(公告)号：JPH11191201A
公开(公告)日：1999-07-13
申请号：JP35689697
申请日：1997-12-25
Applicant: IBM
Inventor： SUZUKI HIROMASA , KURACHI KOJI , SUDA KATSUMI , ASANO HIDEO , OKADA KENJI , TAKASE MAKOTO , KIHASHI AKIRA , NISHINOMIYA HIROMI , MATSUI TAKAO , ENDO TATSUYA , KUROKI KENJI
Abstract: PROBLEM TO BE SOLVED: To improve the performance of an information recording/reproducing device using a GMR(giant magnet resistance) sensor. SOLUTION: This method aims at the restoration of an operating error generated in an information recording/reproducing device including a storage medium, a head using a GMR sensor, an actuator arm for mounting the head and locating the head on a prescribed position on the front surface of the storage medium and a control part for controlling the operation of the actuator arm and read/write operation. At this time, it comprises a step for executing a first error restoring procedure 103, a step for executing a first GMR evaluating procedure 109 for evaluating the performance of the GMR sensor when the operating error is not restored in the first error restoring procedure and a step 117 for impressing a reset pulse to the GMR sensor in accordance with the first GMR evaluating procedure.
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公开(公告)号：JP2000260142A
公开(公告)日：2000-09-22
申请号：JP5998199
申请日：1999-03-08
Applicant: IBM
Inventor： KUROKI KENJI , ALBRECHT THOMAS , SAI FUMINORI , NAKAGAWA YUZO , KOIDE NOBUHISA , MURAI MASASHI , TAKAHASHI HIROSHI , TIMOTHY RILEY , ARNO CLASSEN
Abstract: PROBLEM TO BE SOLVED: To provide a retract circuit capable of dealing with miniaturization and power supply voltage reduction. SOLUTION: Concerning a retract circuit 13, while a device power source Vcc is turned on, a retract capacitor Cr is charged by a boost voltage Vup (=3×Vcc) generated by a booster circuit 26. When the device power source Vcc is turned off and a voice coil motor (VCM) driver 12 stops operating, a power source OFF is detected by a power source OFF detecting circuit 21 and retract delay time Td is provided by a retract delay circuit 22. After the lapse of the retract delay time Td from the OFF of the device power source, switch circuits 24 and 25 are turned on by a retract driving circuit 23, the retract capacitor Cr charged with the boost voltage Vup is discharged, a discharging current is supplied to a voice coil 5a and a head assembly is retracted.
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公开(公告)号：JP2000243076A
公开(公告)日：2000-09-08
申请号：JP3392999
申请日：1999-02-12
Applicant: IBM
Inventor： ANDO KEIMEI , KITABORI HIRONORI , MATSUMURA SATOSHI , KUROKI KENJI , ALBRECHT THOMAS , DAVID ALBRECHT
Abstract: PROBLEM TO BE SOLVED: To provide a joning method enabling the joining of a flex cable and a circuit board which cannot be embodied with ordinary connectors on account of their dimensional restrictions in a hard disk device of an extremely small size/thin type and the hard disk device utilizing the same. SOLUTION: This joining method is the method for joining the flex cable 3 for transmitting the input and output signals to a head formed in a device body 1 of a hard disk and the circuit board 11. A groove part 2 is formed in the device body 1 and the connector 12 consisting of a projecting part of a shape insertable into the formed groove part 2 is formed at the circuit board 11. The joining part of the flex cable 3 and the connector 12 of the circuit board 11 are inserted into the groove part 2. The terminal 13 of the connector 12 and the terminal 4 of the joining part of the flex cable 3 are joined. The hard disk device has the joining part utilizing the joining method described above.
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10.发明专利
公开(公告)号：JPH11195210A
公开(公告)日：1999-07-21
申请号：JP35791297
申请日：1997-12-25
Applicant: IBM
Inventor： MATSUI TAKAO , ENDO TATSUYA , SUZUKI HIROMASA , YAMAGUCHI KATSUJI , KUROKI KENJI , ASANO HIDEO
Abstract: PROBLEM TO BE SOLVED: To provide the method in which an initialization of a great magneto resistance(GMR) head and a reset are executed and to provided the device for executing the method. SOLUTION: The yield of the GMR head is improved by executing the initialization, in which the magnetization direction of the free layer of the GMR head (mounted on the hatched surface of a slider 14) is directed by an external magnetic field, and is executed in the opposite direction again. Moreover, a discrimination is made to determine whether the magnetization direction of a pin stopping layer of the head is temporarily reversed or not and damaged GMR head is selected in an early stage. Then, the magnetization direction of the layer is returned in a positive direction, a semi-static test is conducted to check the reproduced response of the head and a safe efficient reset is executed. The reset is conducted by not only applying a pulse but also is executed while applying an external magnetic field in the pin stopping direction or only applying a strong magnetic field. Note that a tool 500 is commonly used throughout the process levels for an initialization, a reset and a reproducing response.
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