公开(公告)号：JP2001312802A

公开(公告)日：2001-11-09

申请号：JP2000126708

申请日：2000-04-26

Applicant: IBM

Inventor： OTA MUTSURO ,  KUROKI KENJI ,  MATSUDA HIROSHI ,  TAKAHASHI HIROSHI ,  NOGUCHI SATOSHI ,  KITABORI HIRONORI ,  TAMURA HITOSHI

IPC: G11B5/024 ,  H01F7/14

Abstract: PROBLEM TO BE SOLVED: To provide a disk device which can effectively erase data on a magnetic disk while suppressing the operation of a magnetic field on a spindle motor. SOLUTION: The top cover 14 of the disk device is provided with pole pieces 14a1 and 14a2. When this disk device is placed in an external magnetic field, a magnetic field which is local and has a steeper magnetic gradient than the external magnetic field is produced from the pole pieces 14a1 and 14a2. When the pole pieces 14a1 and 14a2 are arranged on the inner peripheral side of the magnetic disk, data on the magnetic disk can effectively be erased while the operation of the magnetic field on the spindle motor is suppressed.

公开(公告)号：JPH1092092A

公开(公告)日：1998-04-10

申请号：JP23630096

申请日：1996-09-06

Applicant: IBM

Inventor： DAVID W ALBRECHT ,  MATSUDA HIROSHI ,  TAKAHASHI HIROSHI

IPC: F16C19/08 ,  F16C19/52 ,  F16C35/063 ,  G11B19/20 ,  H02K5/173

Abstract: PROBLEM TO BE SOLVED: To stably fix bearing cartridge and a hub without reducing the pitch of bearing balls by providing a hollow section at the center of the shaft of the bearing cartridge and simultaneously providing a cylindrical protrusion to be inserted into the hollow section on the hub. SOLUTION: A hollow section 24 is provided at the center of a shaft 22 of a bearing cartridge. Then, a cylindrical protrusion section 54, which is provided on a hub 52, is inserted into the section 24 and the shaft 22 and the hub 52 are fixed. The section 54 of the hub 52 and the section 24 of the shaft 22 are fixed by shrinkage fit or adhesive so as to avoid the occurrence of mutual deviation. Thus, a hub fitting protrusion matched with a conventional shaft is eliminated, and the fixing construction is miniaturized and stabilized without reducing the pitch between the balls of the bearing cartridge.

公开(公告)号：JP2001243735A

公开(公告)日：2001-09-07

申请号：JP2000043640

申请日：2000-02-21

Applicant: IBM

Inventor： OTA MUTSURO ,  NAKAMURA TAKAHIDE ,  MATSUDA HIROSHI ,  TAKAHASHI HIROSHI

IPC: G11B21/12 ,  G11B5/54 ,  G11B21/22

Abstract: PROBLEM TO BE SOLVED: To provide a disk driving device which can properly control a magnetic head at the time of loading in a hard disk drive of depopulated version where the member of magnetic heads and suspension arms is fewer than in a reference hard disk drive. SOLUTION: A tilt angle of a second slope 61c of a ramp 6 installed in a hard disk drive of depopulated version is made to be larger than the tilt angle of the corresponding slope of the ramp 6 installed in a reference hard disk drive.

公开(公告)号：JP2002245771A

公开(公告)日：2002-08-30

申请号：JP2001036210

申请日：2001-02-13

Applicant: IBM

Inventor： FUJIWARA TAKAYUKI ,  KITABORI HIRONORI ,  MATSUDA HIROSHI

IPC: G11B25/04 ,  G11B33/14

Abstract: PROBLEM TO BE SOLVED: To easily check whether a breather filter is mounted or not after a top cover is assembled to a base. SOLUTION: Filter check holes 21a and 21b are formed within a region where the breather filter 14 is mounted in addition to an outdoor air port 20 for communicating the gas between the breather filter 14 and the outside. For example, pressurized gas is supplied from the outdoor air port 20 in a leak test to an HDD1. Unless the breather filter 14 is mounted, the gas leaks from the filter check holes 21a and 21b. Accordingly, the breather filter 14 can be detected not to be mounted by measuring the pressure in the leak test. Figure 2 is the perspective view of the top cover.

公开(公告)号：JP2000311477A

公开(公告)日：2000-11-07

申请号：JP11953099

申请日：1999-04-27

Applicant: IBM

Inventor： TSUNAKO KAZUJI ,  KURAMOTO KENICHI ,  MATSUDA HIROSHI ,  KITABORI HIRONORI

IPC: B65D73/02 ,  B65D85/86 ,  G11B33/14 ,  H05F3/02 ,  H05K9/00 ,  B65D65/40

Abstract: PROBLEM TO BE SOLVED: To provide a hard disk drive which is not damaged by ESD (electrostatic discharge) even when handled by a general end user and a conductive sheet used for it. SOLUTION: This hard disk drive is constituted by storing disk constitution members in a housing 1, and the housing 1 is constituted so that it is covered with the conductive sheet 2. Thus, the housing 1 is covered with the conductive sheet 2 and ESD in any direction is absorbed by the conductive sheet and never passes through the disk constitution members placed in the housing 1.

公开(公告)号：JPH08106761A

公开(公告)日：1996-04-23

申请号：JP23489094

申请日：1994-09-29

Applicant: IBM

Inventor： SERIZAWA KOJI ,  KOYANAGI ICHIRO ,  MATSUDA HIROSHI ,  MATSUZAKI SHINICHI ,  TAKAHASHI HIROSHI

IPC: G11B21/02 ,  G11B5/48 ,  G11B25/04 ,  H05K1/18 ,  H05K3/00

Abstract: PURPOSE: To obtain a low-cost flexible cable structure by improving assembling properties. CONSTITUTION: In a hard disk drive, power and signal are transmitted and received between a carriage having a magnetic head for reading the magnetic information under the positional control on the disk and a card of the lower surface of a base. The movable part 44 of the cable 42 is supported by the carriage, followed up, and a non-movable part 46 is bent to enclose a reinforcing plate 50, and mounted on the base via the late 50. The plate 50 reinforces to connect a carriage connector 84 to the card 40 on the lower surface 60, and to hold the attitude to hold the lateral attitude of the part 44 on the thick surface 64. In summary, the one plate is sufficient.