公开(公告)号：JPH07211031A

公开(公告)日：1995-08-11

申请号：JP25716794

申请日：1994-10-21

Applicant: IBM

Inventor： TEIMOSHII JIEI BURANKU ,  JINNEDEIN BOUTAGOU ,  KEBIN JIYATSUKU ERIKUSON ,  RICHIYAADO GURIINBAAGU

IPC: G11B21/12 ,  G11B5/54 ,  G11B19/20

Abstract: PURPOSE: To obtain a capacitor discharge retracting system for a compact disk drive by using a voltage obtained by boosting a power source voltage for making an actuator retracting circuit using a capacitor at a high level. CONSTITUTION: The voice coil motor 21 of an actuator is controlled by an actuator driving circuit including a control circuit 23 and transistors Q1 to Q4. While the power source of the disk drive is normally thrown a pair of transistors Q1, Q4 or Q2 an Q3 are individually turned on to be driven in the direction of a head arm assembly or another direction corresponding to how large the current is and the direction of the current flowing through a voice coil 20. When the supply of a power source voltage +Vcc is interrupted, the driving circuit including the transistors Q1 to Q4 is nonoperable, the retract enable signal of a line 35 starts the retracting circuit to supply power for the voice coil 20 through lines 37 and 38 and a converter head is retracted and unloaded by the voice coil 20.