公开(公告)号：SG83193A1

公开(公告)日：2001-09-18

申请号：SG200001268

申请日：2000-03-08

Applicant: IBM

Inventor： FU-YING HUANG ,  WAYNE ISAMI AMAINO ,  JIANN-CHANG LO ,  MATTHEW T WHITE

IPC: G11B5/48 ,  G11B33/08 ,  G11B21/02

Abstract: A disk drive having an arm assembly equipped with a primary actuator such as a VCM and a mode-canceling actuator such as a PZT mounted at a location selected in such a way that the strain in the mode-canceling actuator is in phase with sway deformations of the primary actuator produced by the vibrational modes of the arm assembly. The primary actuator is driven to exert a primary force,on the arm assembly while the secondary driver ensures that the mode-canceling actuator applies a mode-canceling force,on arm assembly such that the gain and phase of one or more vibrational modes are canceled.

公开(公告)号：SG94720A1

公开(公告)日：2003-03-18

申请号：SG1999004664

申请日：1999-09-17

Applicant: IBM

Inventor： FU-YING HUANG ,  WAYNE ISAMI IMAINO ,  JIANN-CHANG LO ,  ROGER WILLIAM WOOD

IPC: G11B21/02 ,  G11B5/48 ,  G11B5/55 ,  G11B5/54 ,  G11B33/12 ,  G11B21/08

Abstract: An actuator assembly having two coils disposed between the poles of a voice coil motor (VCM) magnet for improved dynamic performance during settling and tracking operations in a disk drive. The two coils in the VCM are connected to separate current sources to allow the current flow in the two coils to have the same sense (clockwise or counterclockwise) or the opposite sense with respect to each other. When the current flows in the two coils have the opposite sense, excitation of the principal in-plane bending mode resonance of the actuator assembly is suppressed allowing the use of an increased servo bandwidth for settling and tracking operations of the disk drive. During seek operations of the disk drive, where maximum torque on the actuator is desirable, the coil currents in the two coils are chosen to have the same sense so that the forces on the actuator from the two coils are additive.

公开(公告)号：MY114147A

公开(公告)日：2002-08-30

申请号：MYPI19943560

申请日：1994-12-29

Applicant: IBM

Inventor： MICHAEL SERVEDIO ,  JIANN-CHANG LO ,  JAMES EDWARD BOYETTE JR

IPC: G01R31/02 ,  G01R1/06 ,  G01R31/28 ,  G01R1/073

Abstract: A SYSTEM FOR PROBING BOTH SIDES OF A HIGH DENSITY PRINTED CIRCUIT BOARD (92) INCLUDES AN OPEN FRAME (14) EXTENDING AROUND THE CIRCUIT BOARD WHEN IT IS HELD IN A TEST POSITION BY A CIRCUIT BOARD CARRIER (78). THE FRAME INCLUDES TWO PARALLEL RAIL STRUCTURES (20, 22) EXTENDING ABOVE, AND AT OPPOSITE ENDS OF, THE CIRCUIT BOARD IN THE TEST POSITION. THE FRAME ALSO INCLUDES ANOTHER TWO PARALLEL RAIL STRUCTURES EXTENDING BELOW, AND AT OPPOSITE ENDS OF, THE CIRCUIT BOARD. THE UPPER AND LOWER RAIL STRUCTURES EXTEND PERPENDICULARLY TO ONE ANOTHER, AND AREFASTENED TOGETHER AT THE CORNERS OF THE FRAME BY MEANS OF COMPRESSION BOLT ASSEMBLIES (48, 49). TWO GANTRY STRUCTURES (12) ARE MOVED IN A FIRST DIRECTION BETWEEN THE UPPER RAIL STRUCTURES, WHILE TWO OTHER GANTRY STRUCTURES ARE MOVED IN A DIRECTION PERPENDICULAR TO THE FIRST DIRECTION BETWEEN THE LOWER RAIL STRUCTURES. A CARRIAGE (36) MOVES ALONG EACH GANTRY STRUCTURE, AND A PROBE (56) IS MOUNTED ON EACH CARRIAGE TO BE MOVED TOWARD AND AWAY FROM THE ADJACENT SURFACE OF THE CIRCUIT BOARD. THE CIRCUIT BOARD IS MOVED BY A BOARD CARRIER BETWEEN A POSITION, OUTSIDE THE FRAME, IN WHICH IT IS LOADED AND UNLOADED, AND THE TEST POSITION.(FIG.1)