公开(公告)号：JP2000113612A

公开(公告)日：2000-04-21

申请号：JP26475099

申请日：1999-09-20

Applicant: IBM

Inventor： FAN FU IN ,  WAYNE ISAMI IMAINO ,  ROO JAN CHAN ,  ROGER WILLIAM WOOD

IPC: G11B21/02 ,  G11B5/48 ,  G11B5/55

Abstract: PROBLEM TO BE SOLVED: To reduce a vibration mode and enhance performance and stability by a method wherein there are formed an outside coil and a concentric inside coil in a backward extension part, and at the time of selection, a current of the inside coil is in a counter direction to a current of the outside coil during setting operation and tracking operation, and a current of the outside coil and the inside coil is in the same direction during seek operation. SOLUTION: A double coil actuator assembly 100 has outside and inside actuator coils 102, 104 between actuator coil support arms 94, 96 backwardly of a main body 92. Currents IO, II of the coils 102, 104 during seek operation are in the same direction, and a magnetic field generated by the currents IO, II generates a large synthetic torque by an interaction with the magnetic field of a VCM magnet. In the case of setting operation and tracking operation, the currents IO, II is in a counter direction to each other, and by the interaction with the VCM magnet, an excitation of a vibration mode due to a force generated by the coils 102, 104 is cancelled.