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：JP2002170345A

公开(公告)日：2002-06-14

申请号：JP2000363528

申请日：2000-11-29

Applicant: IBM

Inventor： OTA MUTSURO ,  TAKEUCHI KOICHI ,  TAKAHASHI HIROSHI ,  FUUIN FAN

IPC: G11B21/02 ,  G11B5/55

Abstract: PROBLEM TO BE SOLVED: To provide a head assembly capable of adjusting the center of gravity of the head assembly of a Depopulation version while suppressing the occurrence of a resonance frequency that affects the performance of a disk drive device. SOLUTION: This head assembly 6 that moves on a data storage medium by swinging movement consists of magnetic heads 11c and 11d for reading/ writing data from/to a data storage medium, arms 9a to 9c for attaching the magnetic heads 11c and 11d, a pivot shaft holder 7 for supporting the arms 9a to 9c, a coil 8 for a VCM extending from the holder 7 and a counter weight 15 provided at a prescribed position that is the side opposite to the coil 8 for a VCM with respect to the holder 7.