公开(公告)号：JPH0991816A

公开(公告)日：1997-04-04

申请号：JP24967695

申请日：1995-09-27

Applicant: IBM

Inventor： NAKAMOTO TATSUO ,  TSUDA SHINGO ,  DEEBITSUDO ARUBUREHITO

IPC: G11B23/03 ,  G11B17/02 ,  G11B17/038

Abstract: PROBLEM TO BE SOLVED: To prevent the generation of distortion and deformation of a disk and to surely perform fixation to a spindle by devising and adopting a special structure to a clamp for fixing the disk. SOLUTION: By screw-fastening the screw insertion hole 51 of the clamp 50 and the screw hole 53 of the spindle 16, pressurization force is uniformly transmitted through a J ring 55 to the disk 18A and it is fixed to the spindle 16. At the time, an area thinner than an inner peripheral part is formed on the outer peripheral side of the screw insertion hole 51 of the clamp 50 and a level difference is provided. Thus, at the time of screw-fastening the clamp 50 to the spindle 16, a part of the lower surface of the head of a screw 62 pressurizes the inner peripheral thick part of the clamp 50, an empty area is formed at a thin part and a non-contact state is attained. Thus, at a clamp part near a screw center, the distortion generated by fastening is dispersed at the outer peripheral part of the clamp, the pressurization force applied from the clamp to the J ring 55 is uniformized, the distortion and the deformation generated on the disk are reduced and the fixation is performed.

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.