公开(公告)号：DE69513071D1

公开(公告)日：1999-12-09

申请号：DE69513071

申请日：1995-03-16

Applicant: IBM

Inventor： GARFUNKEL GLEN ADAM ,  SALO MIKE PAUL ,  AOYAGI AKIHIKO ,  YANAGISAWA HIROSHI ,  TERASHIMA HIROSHI ,  KUROKI KENJI

IPC: G11B5/00 ,  G11B5/39 ,  G11B5/465 ,  G11B5/48 ,  G11B5/455

Abstract: In a disk drive actuator head stack assembly, magnetic transducers including magnetoresistive (MR) read heads are connected to a current source and configured to provide an MR sensor current to each MR head wherein the direction of current flow for the MR sensor current in each MR head is the same relative to the actuator for all of the MR heads in the actuator head stack. This configuration allows all of the MR heads in the head stack assembly to initialized simultaneously by applying a homogeneous magnetic field to the head stack assembly, thus providing the capability of initializing the MR heads at the actuator or disk drive level rather than requiring that the MR heads be initialized individually.

公开(公告)号：DE69513071T2

公开(公告)日：2000-05-25

申请号：DE69513071

申请日：1995-03-16

Applicant: IBM

Inventor： GARFUNKEL GLEN ADAM ,  SALO MIKE PAUL ,  AOYAGI AKIHIKO ,  YANAGISAWA HIROSHI ,  TERASHIMA HIROSHI ,  KUROKI KENJI

IPC: G11B5/00 ,  G11B5/39 ,  G11B5/465 ,  G11B5/48 ,  G11B5/455

Abstract: In a disk drive actuator head stack assembly, magnetic transducers including magnetoresistive (MR) read heads are connected to a current source and configured to provide an MR sensor current to each MR head wherein the direction of current flow for the MR sensor current in each MR head is the same relative to the actuator for all of the MR heads in the actuator head stack. This configuration allows all of the MR heads in the head stack assembly to initialized simultaneously by applying a homogeneous magnetic field to the head stack assembly, thus providing the capability of initializing the MR heads at the actuator or disk drive level rather than requiring that the MR heads be initialized individually.

公开(公告)号：SG47371A1

公开(公告)日：1998-04-17

申请号：SG1995002268

申请日：1994-10-25

Applicant: IBM

Inventor： BARLOW IRMELA CHRISTIANE ,  GARFUNKEL GLEN ADAM ,  HOYT ROGER F ,  MARELLO VINCENT ,  MCWILLIAMS CHRISTIAN JR ,  WALLASH ALBERT JOHN

IPC: G11B5/02 ,  G11B5/31 ,  G11B5/39 ,  G11B5/40

Abstract: Electrically conductive protective devices provide a current path shunting the magnetoresistive (MR) sensor element (35) in a magnetic head assembly (21) to discharge static electrical charges without damage to the MR sensor element. A variable conductance device (80) having a nonlinear current-voltage characteristic, such as a pair of Schottky diodes, for example, is connected between the MR sensor element leads in parallel with the MR sensor element or between each MR sensor element lead and a ground reference, the MR sensor element magnetic shields, for example, to provide a discharge current bypass path. Alternatively, one or more bleed resistors (133) are connected between the MR sensor element leads and a ground reference to provide the current bypass path thus allowing any static charge to bleed off.