公开(公告)号：SG79174A1

公开(公告)日：2001-03-20

申请号：SG1996000130

申请日：1994-03-22

Applicant: IBM

Inventor： ROBERT EDWARD FONTANA JR ,  CHERNGYE HWANG ,  VLAD JOSEPH NOVOTNY ,  TIMOTHY CLARK REILEY ,  CELIA ELIZABETH YEACK-SCRANTON ,  CLINTON DAVID SNYDER

IPC: G11B5/10 ,  G11B5/187 ,  G11B5/255 ,  G11B5/31 ,  G11B5/39 ,  G11B5/48

Abstract: A contact recording disk file uses an integrated head-suspension assembly having a head carrier with a dual-layer wear pad for contacting the disk during read and write operations. The outer wear layer of the pad is relatively soft and wear prone compared to a harder and more wear-resistant inner layer. The outer wear layer wears away at a relatively rapid rate during initial wear-in of the head carrier. In this manner the head pole pieces, which extend into the wear pad, are rapidly put into contact with the disk, thereby compensating for initial misalignment of the wear pad with the surface of the disk. The inner wear layer then provides wear resistance over the life of the disk file. In the preferred embodiment, both the outer and inner wear layers are formed of essentially amorphous carbon doped with different amounts of hydrogen.

公开(公告)号：SG83772A1

公开(公告)日：2001-10-16

申请号：SG200000797

申请日：2000-02-14

Applicant: IBM

Inventor： KENJI KUROKI ,  THOMAS ROBERT ALBRECHT ,  FUMINORI SAI ,  YUZO NAKAGAWA ,  NOBUHISA KOIDE ,  MASASHI MURAI ,  KEISHI TAKAHASHI ,  TIMOTHY CLARK REILEY ,  ERNO H KLASSEN

IPC: G11B21/02 ,  G11B19/04 ,  G11B21/12 ,  H02P8/12 ,  G11B5/54

Abstract: A method and apparatus to provide a retract circuit that can correspond to the tendency toward miniaturization and low supply voltage. When drive supply voltage Vcc is applied, a retract circuit charges a retract condenser Cr with boosted voltage Vup, equal to three times Vcc, generated by a booster circuit. Then, if the drive supply voltage Vcc is cut off and a VCM driver stops, the retract circuit detects power-off with a power OFF sense circuit, and provides retract delay time by a retract delay circuit. Furthermore, when the retract delay time elapses after the drive power supply is turned off, the retract driver switches the switching circuits on, discharges the retract condenser, charged at the boosted voltage, supplies discharge current to a voice coil, and retracts the head assembly.