公开(公告)号：JPH0547125A

公开(公告)日：1993-02-26

申请号：JP32832391

申请日：1991-11-18

Applicant: IBM

Inventor： ARAI KOICHI ,  HIEN FUU DAN ,  NAKAGAWA YUZO ,  HARU HIYARUMAA OTSUTESEN ,  ARUN SHIYARUMA ,  MUTOUTANBII SURIIJIYAYANTA

IPC: G11B21/10

Abstract: PURPOSE: To cope with variation in the resonance frequency of an actuator. CONSTITUTION: Under the control a microprocessor 33, a switch 50 is so set as to exclude a filter 48 and a sine wave of variable frequency from a sine wave generator 54 is supplied to a driving circuit 34 to drive an actuator including a suspension 28 and an arm 29 which support a head 14. The microprocessor 44 analyzes a position error signal obtained from a decoder 22 at this time to determine the resonance frequency of the actuator, and constitutes the filter 48 so that the determined resonance frequency is excluded. Then the switch 50 is so set as to supply a signal for driving to the driving circuit 34 through the filter 48.