公开(公告)号：MY105387A

公开(公告)日：1994-09-30

申请号：MYPI19910753

申请日：1991-05-03

Applicant: IBM

Inventor： DAVID PAUL MCREYNOLDS ,  ALAN AUGUST FENNEMA ,  EDWIN RALPH CHILDERS

IPC: G02B7/02 ,  G11B7/08 ,  G11B5/596 ,  G11B7/09 ,  G11B21/00 ,  G11B33/08

Abstract: AN OPTICAL DISK RECORDER, OR OTHER APPARATUS, USE A ROTARY ACTUATOR FOR SUPPORTING A WORK TOOL, SUCH AS AN OBJECTIVE LENS WHICH IS PIVOTABLE OR ROTATABLE ABOUT A PIVOT PIN. ROTATION CAUSING OR TRACKING COILS ON THE ROTARY ACTUATOR ARE DISPOSED ADJACENT TO PERMANENT MAGNET TO SELECTIVELY EFFECT ROTATION OF THE ROTARY ACTUATOR ABOUT THE PIVOT PIN. A BIAS ELECTRICAL CURRENT IS SUPPLIED TO THESE COILS TO GENERATE MAGNETIC FIELDS WHICH ARE IN OPPOSITE ROTATIONAL SENSES; SUCH FIELDS FORCE THE ROTARY ACTUATOR AGAINST THE PIN IN SUCH A MANNER THAT THE POINT OF CONTACT BETWEEN THE ROTARY ACTUATOR AND THE PIN FOLLOWS THE ROTATION OF THE ACTUATOR ABOUT THE PIN. (FIG. 2)