Dynamic magnetic information storage or retrieval – Head mounting – Disk record
Reexamination Certificate
2005-07-19
2005-07-19
Tupper, Robert S. (Department: 2652)
Dynamic magnetic information storage or retrieval
Head mounting
Disk record
C360S245300, C360S245600
Reexamination Certificate
active
06920018
ABSTRACT:
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.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.
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Han Yun-Sik
Hwang Tae-Yeon
Kang Seong-Woo
Kim Jae-Won
Kim Myeong-Eop
Aiello Jeffrey P.
Gregory Smith & Associates
Jennings Earle
Samsung Electronics Co,. Ltd.
Tupper Robert S.
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