Method and apparatus reducing off track head motion due to...

Details Method and apparatus reducing off track head motion due to... Method and apparatus reducing off track head motion due to...

2005-10-25

2005-10-25

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S244800, C360S245400, C360S245600

Reexamination Certificate

active

06958879

ABSTRACT:
An improved and distinctive servo-controller scheme resulting in an overall improvement in PES performance, particularly when applied to hard disk drives employing the invention's TMR reduction mechanisms. The servo-controllers trade off gain in the disk vibration frequency range, in favor of, increased rejection of low frequency disturbances. This leads to the lowest PES statistics, when applied to hard disk drives with the TMR reduction mechanisms of the invention.Improved head gimbal assemblies reducing TMR (Track Mis-Registration) in a hard disk drive are provided. These head gimbal assemblies are as mechanically simple as contemporary head gimbal assemblies, support parallel flying sliders over flat disk surfaces, and reduce TMR induced by disk vibration. They are easier to build, more reliable, and cost less to make, than other known approaches at comparable track densities and rotational rates. The improved head gimbal assemblies include three sets of mechanisms moving the slider parallel the disk surface, when the disk surface is flat, and radially moving the slider toward the track, when the disk surface is bent. The first and third mechanisms as well as the second and third mechanisms can be used together in a head gimbal assembly.

REFERENCES:
patent: 4963806 (1990-10-01), Shinohara et al.
patent: 5377096 (1994-12-01), Ono
patent: 5999369 (1999-12-01), Shimizu et al.
patent: 6061205 (2000-05-01), Finegan
patent: 6088192 (2000-07-01), Riener et al.
patent: 6445545 (2002-09-01), Guo et al.
patent: 6462910 (2002-10-01), Shimizu et al.
patent: 2002/0093754 (2002-07-01), Zhang et al.
Aurthor unknown, Design of a Disk Drive Servo: A Case Study, 37 pages, Chapter 14.
Li, Yunfeng and Horowitz, Roberto, Active Vibration Control of a PZT Actuated Suspension in Hard Disk Drives, date unknown, 6 pages.
Mcallister, S. Jeffrey, The Effect of Disk Platter Resonances on Track Misregistration in 3.5 Inch Disk Drives, IEEE Transactions on Magnetics, May 1996, 5 pages, vol. 32, No. 3.
Hao, Qi et al., TMR Online Optimization Using Quasi-Newton Method for HDD Servo Systems, Procedings of the American Control Conference, Jun. 2000, 55 pages, Chicago, Illinois.
Goh, B. Teck et al., Design and Implementation of a Hard Disk Drive Servo System Using Robust and Perfect Tracking Approach, IEEE Transaction on Control Systems Technology, Mar. 2001, 13 pages, vol. 9, No. 2.
Li, Yunfeng and Horowitz, Roberto, Mechatronics of Electrostatic Microactuators for Computer Disk Drive Dual-Stage Servo Systems, IEEE/Asme Transactions of Mechatroics, Jun. 2001, 11 pages, vol. 6, No. 2.
Li, Yunfeng and Horowitz, Roberto, Active Suspension Vibration Control with Dual Stage Actuators in Hard Disk Drives, Proceedings of the American Control Conference, Jun. 25-27, 2001, 6 pages.
Y. Li, R. Horowitz, Design and Testing of Track-Following Controllers for Dual-Stage Servo Systems with PZT Actuated Suspensions, Microsystem Technologies 8 (2002), 12 pages, Springer-Verlag 2002.
Web Control Articles, 164 pages, Oct. 10, 2002.

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