公开(公告)号：JP2001093262A

公开(公告)日：2001-04-06

申请号：JP26674199

申请日：1999-09-21

Applicant: IBM

Inventor： MATSUZAKI SHINICHI ,  SASAKI MASAKAZU ,  OTA MUTSURO ,  SUZUKI TAKAHISA

IPC: G11B33/12 ,  G11B17/038 ,  G11B19/20 ,  G11B25/04

Abstract: PROBLEM TO BE SOLVED: To provide a low-cost dummy disk, wherein disk slipping or the deformation of the dummy disk is prevented even when a heating/cooling process is repeated, and the increase of a load on a bearing by a weight increase is prevented. SOLUTION: A dummy disk 24 made of stainless steel is loaded instead of the magnetic disk of a hard disk drive. Rigidity is reduced by forming a circumferential groove 241 in the dummy disk 24, and a resonance frequency is matched with magnetic disks (0, 1). Thus, even when the dummy disk 24 is loaded, a pitching frequency equal to that when only the magnetic disk is loaded.

公开(公告)号：JPH04181018A

公开(公告)日：1992-06-29

申请号：JP30733390

申请日：1990-11-15

Applicant: IBM

Inventor： MASUDA YOSHIMI ,  SASAKI MASAKAZU ,  SATO KIYOSHI

IPC: F16C33/38 ,  F16C33/66 ,  G11B21/02

Abstract: PURPOSE: To prevent frictional force from increasing by providing a cage holding a ball disposed between an inner race and an outer race of a bearing to be used for mounting a carriage supporting a head on a base within a prescribed range with a hole for supplying grease which extends toward the ball. CONSTITUTION: An upper bearing part 1U is provided with an outer race 8U which is disposed coaxially with an inner race 6U so as to be opposed to the inner race 6U and a cage 12U constituted of a hollow cylindrical member in which a plurality of recessed part 11U storing a plurality of balls 10U disposed between the inner race 6U and the outer race 8U one by one are formed on a lower surface. Because cages 12U, 12D are provided with holes 18U, 18D for supplying grease which extend toward each of balls 10U, 10D, grease is supplied to only balls 10U, 10D which actually require lubrication. Therefore, extra grease does not enter a gap between a shaft 2 and the cages 12U, 12D, and frictional force between the shaft 2 and the bearing 1 is not increased.

公开(公告)号：JPH09167303A

公开(公告)日：1997-06-24

申请号：JP33030095

申请日：1995-12-19

Applicant: IBM

Inventor： OKADA KENJI ,  ARAI KOICHI ,  TSUNODA HISASHI ,  SUZUKI HIROMASA ,  SASAKI MASAKAZU ,  KIHASHI AKIRA ,  ENDO TATSUYA

IPC: G11B21/02 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B20/18 ,  G11B20/24 ,  G11B27/36 ,  G11B33/10

Abstract: PROBLEM TO BE SOLVED: To eliminate generation of thermal asperity and to avoid generation of error by making head vibration have a directional component approaching the disk surface. SOLUTION: When an error is generated, a vibration signal from a means 52 is superposed on a signal from a controller 43 by a direction of HDC and supplied to a VCM driving means 45. And a head 20 is positioned at a desired position according to thermal asperity position. By providing the VCM 46 with a vibration signal, a head assembly starts rolling movement centering the joint point with a dimple. And the head assembly generates vertical vibration with a frequency equivalent to the given vibration signal frequency, and eliminate the thermal asperity on the disk.

公开(公告)号：JPH08124287A

公开(公告)日：1996-05-17

申请号：JP26513094

申请日：1994-10-28

Applicant: IBM

Inventor： SATO KIYOSHI ,  SASAKI MASAKAZU ,  KITABORI HIRONORI ,  NEMOTO SUNAO ,  DEEBITSUDO ARUBUREHITO ,  GUREGORII FURIIZU

IPC: G11B19/20 ,  G11B25/04 ,  G11B33/08 ,  G11B33/12 ,  H02K7/08

Abstract: PURPOSE: To equalize the coupled resonance frequency of a hard disc drive at the time of loading one magnetic disc and two magnetic discs based on the parameters of a model. CONSTITUTION: Assuming the spring coefficient of a spindle motor is Kp and the mass thereof is Mp, while the spring coefficient of a magnetic disc is Kd and the mass thereof is Md, a disc drive is modeled by a coupled vibration model (A) of a linear two degree of a freedom system for a case (B) loaded with a single disc and a case (C) loaded with two discs. The spring coefficient Kp of the spindle motor, i.e., the components, are then adjusted such that the coupled resonance frequency of the spindle motor and the disc is substantially constant for the case loaded with a single disc and the case loaded with two discs. According to the arrangement, stabilized track follow can be ensured without requiring any additional disc.