公开(公告)号：ES2090122T3

公开(公告)日：1996-10-16

申请号：ES90901621

申请日：1990-01-08

Applicant: IBM

Inventor： DEW GRAHAM NIGEL ,  HEARN ANTHONY ROGER ,  SEBBORN DAVID JOHN ,  YOUNG JULIAN THOMAS

IPC: G11B17/038 ,  G11B17/00 ,  G11B19/20 ,  G11B23/03 ,  G11B25/04 ,  G11B33/14

Abstract: PCT No. PCT/GB90/00020 Sec. 371 Date Oct. 1, 1992 Sec. 102(e) Date Oct. 1, 1992 PCT Filed Jan. 8, 1990 PCT Pub. No. WO91/11004 PCT Pub. Date Jul. 25, 1991.A disk file includes an expansion ring attached to the wall of the hub and which is located between the lowermost disk of the disk stack and the hub flange. A circular ridge concentric with the hub is formed on the ring and engages the underside of the disk. The ring is adapted so that the thermal expansion of the ring is substantially equal to that of the aluminum disk at the position of contact between the two. A washer interposed between ring and flange allows the ring to move freely relative to the flange. During thermal cycling, the ring and disk move at the same rate at the point of contact, the ring ensuring that the disks remain concentric with the hub throughout the range of disk file operating temperatures.

公开(公告)号：DE69013188T2

公开(公告)日：1995-05-11

申请号：DE69013188

申请日：1990-03-08

Applicant: IBM

Inventor： HATCHETT MICHAEL ROBERT ,  HEARN ANTHONY ROGER ,  HEATH JOHN STEWART ,  LACEY CHARLES MICHAEL ,  LAREK THADDEUS LOUIS ,  REIDENBACH JOHN RALPH ,  SCWIETERS CLARENCE RAYMOND

IPC: G11B21/02 ,  F16C29/04 ,  G11B5/55 ,  G11B21/08 ,  G11B33/00 ,  H02K5/173 ,  H02K41/035 ,  G11B5/596

Abstract: A linear actuator for positioning the heads of a disk file relative to tracks on the disks employs a ceramic material having wear properties superior to steel in guide surfaces for guiding a head supporting carriage running on rotary bearings in contact with the guide surfaces. The preferred ceramic material is tetragonally stabilized zirconia.

公开(公告)号：DE3680667D1

公开(公告)日：1991-09-05

申请号：DE3680667

申请日：1986-05-23

Applicant: IBM

Inventor： COOPER ROGER ANTHONY ,  HEARN ANTHONY ROGER ,  CASTLE FRANK ERIC

IPC: G11B21/02 ,  G11B5/54 ,  G11B5/55

Abstract: Head/arm assembly and rotary access mechanism for a disk file comprises (a) at least one planar cantilever arm (10) for supporting a transducing head (31) at or near its free end; (b) a counterweight (50); (c) an attachment means (51,54) for attaching the counterweight (50) at the opposite end of the arm (10) so that the head/arm assembly is balanced under predetermined conditions about an axis (70) through the assembly perpendicular to the plane of the arm (10); and (d) locating means (43,44,45) for locating the head/arm assembly on a rotary actuator (80) with the axis coincident with the axis of rotatkion of the actuator (80), the actuator being subject to inherent torsional resonances about its axis of rotation; the head/arm assembly being such that (e) the attachment means includes a resilient connection (54) for at least a portion (52) of the counterweight (50) such that the resiliently supported portion (52) acts as an auxiliary mass damper tuned relative to the fundamental resonant frequency of torsional oscillation of the rotary actuator (80).

公开(公告)号：DE3167267D1

公开(公告)日：1985-01-03

申请号：DE3167267

申请日：1981-03-18

Applicant: IBM

Inventor： HEARN ANTHONY ROGER

IPC: G11B21/16 ,  G11B5/48 ,  G11B5/60 ,  G11B21/02 ,  G11B21/21 ,  G11B5/58

Abstract: A cantilever magnetic head support arm assembly for a disk file comprises a flat beam structure and a means of damping the structure against out-of-plane vibrations. The damping means comprises a rigid sidebar extending along one longitudinal edge of the beam structure and a layer of compliant damping material connecting the beam structure and sidebar together. Relative motion between the beam structure and sidebar causes elastic shear deformation of the damping layer to absorb the energy of vibration.