Active fly height control crown actuator

Details Active fly height control crown actuator Active fly height control crown actuator

2005-09-27

2005-09-27

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S294400, C360S294500, C360S294600, C360S294700, C360S236500, C360S236600, C360S236700

Reexamination Certificate

active

06950266

ABSTRACT:
A micro-actuator is comprised of a piezoelectric motor mounted on a flexure tongue with offsetting hinges, to perform a fine positioning of the magnetic read/write head. The substantial gain in the frequency response greatly improves the performance and accuracy of the track-follow control for fine positioning. The simplicity of the enhanced micro-actuator design results in a manufacturing efficiency that enables a high-volume, low-cost production. The micro-actuator is interposed between a flexure tongue and a slider to perform an active control of the fly height of the magnetic read/write head. The induced slider crown and camber are used to compensate for thermal expansion of the magnetic read/write head, which causes the slider to be displaced at an unintended fly height position relative to the surface of the magnetic recording disk. The enhanced micro-actuator design results in reduced altitude sensitivity, ABS tolerances, and reduced stiction. The controlled fly height of the magnetic read/write head prevents a possibility of a head crash, while improving the performance and data integrity.

REFERENCES:
patent: 6335849 (2002-01-01), Khan et al.
patent: 6396667 (2002-05-01), Zhang et al.
patent: 6700727 (2004-03-01), Crane et al.

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