公开(公告)号：JP2001057037A

公开(公告)日：2001-02-27

申请号：JP22749399

申请日：1999-08-11

Applicant: IBM

Inventor： TSUDA SHINGO ,  SOGA EIJI ,  SATO KIYOSHI ,  FUUIN FAN ,  SENBA TETSUO

IPC: G11B21/02 ,  G11B5/48 ,  H02K33/18 ,  H02K41/035

Abstract: PROBLEM TO BE SOLVED: To obtain an actuator that enables constantly stable control regardless of the turning position of an actuator arm, in positively damping butterfly resonance of the actuator and also coil breathing resonance. SOLUTION: A narrow-shaped additional S pole 16b is arranged on the outer edge 10c of a flat coil 10 comprising VCM, in the manner that 5 magnetic pole of the same poIarity operates regardless of the turning position of an actuator arm 8. As a result, it is possible to keep in the same phase the phase characteristics of the transfer function of the actuator particularly near the coil breathing resonance frequency; therefore, in positively damping the butterfly phenomenon of the actuator and also the coil breathing phenomenon, a stable control is always possible regardless of the turning position of the actuator arm.

公开(公告)号：JPH10241305A

公开(公告)日：1998-09-11

申请号：JP4569497

申请日：1997-02-28

Applicant: IBM

Inventor： CHAWANDANI TAKESHI ,  TSUDA SHINGO ,  KATO YASUHIKO ,  SATO KIYOSHI

IPC: G11B21/02 ,  G11B5/54

Abstract: PROBLEM TO BE SOLVED: To provide a crash stop capable of adjusting a shock absorbability by using the same elastic material and also whose attaching and detaching work is easy. SOLUTION: A metallic pin 41 has a recessed part 41f at an intermediate part 41a. An elastic body 42 has three impellers 43 (43a-43c). A crash stop 40 is a stop in which the metallic pin 41 is force-fitted into the pin inserting hole of the elastic body 42 and the part between the supporting part 41d and the knob part 41e of the metallic pin 41 is covered with the elastic body 42. A void 45 is formed at the boundary between the intermediate part 41a of the metallic pin 41 and the elastic body 42. Here, the supporting part 41d is made to be insertingly engaged with the crash stop supporting hole 10d provided in a base 10a freely pullingly and insertingly and tip ends 44 (44a-44c) of the impellers are made to be brought into internal contact with a crash stop inserting port 6c of an upper yoke 6 by being narrowed and the crash stop 40 is fixed buy this frictional force. Abutting shocks of stoppers (23a-23b) of an actuator are absorbed by the cooperative work of the elastic body 42 and the void 45.

公开(公告)号：JPH08124373A

公开(公告)日：1996-05-17

申请号：JP26513194

申请日：1994-10-28

Applicant: IBM

Inventor： NAKAGAWA YUZO ,  SATO KIYOSHI ,  KITABORI HIRONORI ,  KAGAMI NAOYUKI

IPC: G11B33/12 ,  G11B25/04

Abstract: PURPOSE: To minimize the size of a printed board while increasing the degree of freedom of a spindle motor. CONSTITUTION: The connector 52 of an interface cable is disposed oppositely to a spindle motor 18 and a printed board 50 has such size as not touching the height of the spindle motor 18. Consequently, the degree of freedom is increased in the arrangement of the spindle motor 18. The distance between the connector 52 of the interface cable and the connector of a preamplifier mounted on the printed board 50 is short. This structure can minimize the size of the printed board 50.

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.