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：SG83772A1

公开(公告)日：2001-10-16

申请号：SG200000797

申请日：2000-02-14

Applicant: IBM

Inventor： KENJI KUROKI ,  THOMAS ROBERT ALBRECHT ,  FUMINORI SAI ,  YUZO NAKAGAWA ,  NOBUHISA KOIDE ,  MASASHI MURAI ,  KEISHI TAKAHASHI ,  TIMOTHY CLARK REILEY ,  ERNO H KLASSEN

IPC: G11B21/02 ,  G11B19/04 ,  G11B21/12 ,  H02P8/12 ,  G11B5/54

Abstract: A method and apparatus to provide a retract circuit that can correspond to the tendency toward miniaturization and low supply voltage. When drive supply voltage Vcc is applied, a retract circuit charges a retract condenser Cr with boosted voltage Vup, equal to three times Vcc, generated by a booster circuit. Then, if the drive supply voltage Vcc is cut off and a VCM driver stops, the retract circuit detects power-off with a power OFF sense circuit, and provides retract delay time by a retract delay circuit. Furthermore, when the retract delay time elapses after the drive power supply is turned off, the retract driver switches the switching circuits on, discharges the retract condenser, charged at the boosted voltage, supplies discharge current to a voice coil, and retracts the head assembly.