公开(公告)号：SG87138A1

公开(公告)日：2002-03-19

申请号：SG200004135

申请日：2000-07-25

Applicant: IBM

Inventor： SHINGO TSUDA ,  EIJI SOGA ,  KIYOSHI SATOH ,  FU-YING HUANG ,  TETSUO SENBA

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

Abstract: A stator magnet according to a first embodiment of the present invention forms a voice coil motor with a closed coil. The closed coil is supported by an actuator arm in a rotatable manner and at a predetermined rotation angle. The closed coil has first and second side edges that extend along different lines in radial directions whose center is a center of rotation of the actuator arm. It also has an outer edge that connects edges of outer sides of the first and second side edges with viewed from the radial direction, and extends along an arc whose center is the center of rotation. A first magnetic pole region is located within a moving area of the first side edge to act on the first side edge. A second magnetic pole region is located within a moving area of the second side edge to act on the second side edge. The polarity of the second magnetic pole region is opposite to the polarity of the first magnetic pole region. A third magnetic pole region is located within a moving area of the outer edge to act on the outer edge. The polarity of the third magnetic pole region is the same as the polarity of the first magnetic pole region.

公开(公告)号：SG83193A1

公开(公告)日：2001-09-18

申请号：SG200001268

申请日：2000-03-08

Applicant: IBM

Inventor： FU-YING HUANG ,  WAYNE ISAMI AMAINO ,  JIANN-CHANG LO ,  MATTHEW T WHITE

IPC: G11B5/48 ,  G11B33/08 ,  G11B21/02

Abstract: A disk drive having an arm assembly equipped with a primary actuator such as a VCM and a mode-canceling actuator such as a PZT mounted at a location selected in such a way that the strain in the mode-canceling actuator is in phase with sway deformations of the primary actuator produced by the vibrational modes of the arm assembly. The primary actuator is driven to exert a primary force,on the arm assembly while the secondary driver ensures that the mode-canceling actuator applies a mode-canceling force,on arm assembly such that the gain and phase of one or more vibrational modes are canceled.

公开(公告)号：SG97221A1

公开(公告)日：2003-07-18

申请号：SG200106964

申请日：2001-11-12

Applicant: IBM

Inventor： MUTSURO OHTA ,  KOHICHI TAKEUCHI ,  KEISHI TAKAHASHI ,  FU-YING HUANG

IPC: G11B21/02 ,  G11B5/55

Abstract: A disk drive head assembly enables adjustment of a center of gravity of the head assembly of a depopulation version, while suppressing an occurrence of a resonance frequency affecting the performance of the disk drive apparatus. The head assembly for the data storage media includes: magnetic heads for reading/writing data from/to the data storage media, arms to which the magnetic heads are attached, a pivot shaft holder for supporting the arms, a coil for a voice coil motor extended from the pivot shaft holder, and a counter weight provided at a predetermined position opposite to a coil for the voice coil motor with respect to the pivot shaft holder.

公开(公告)号：SG94720A1

公开(公告)日：2003-03-18

申请号：SG1999004664

申请日：1999-09-17

Applicant: IBM

Inventor： FU-YING HUANG ,  WAYNE ISAMI IMAINO ,  JIANN-CHANG LO ,  ROGER WILLIAM WOOD

IPC: G11B21/02 ,  G11B5/48 ,  G11B5/55 ,  G11B5/54 ,  G11B33/12 ,  G11B21/08

Abstract: An actuator assembly having two coils disposed between the poles of a voice coil motor (VCM) magnet for improved dynamic performance during settling and tracking operations in a disk drive. The two coils in the VCM are connected to separate current sources to allow the current flow in the two coils to have the same sense (clockwise or counterclockwise) or the opposite sense with respect to each other. When the current flows in the two coils have the opposite sense, excitation of the principal in-plane bending mode resonance of the actuator assembly is suppressed allowing the use of an increased servo bandwidth for settling and tracking operations of the disk drive. During seek operations of the disk drive, where maximum torque on the actuator is desirable, the coil currents in the two coils are chosen to have the same sense so that the forces on the actuator from the two coils are additive.