Head Gimbal Assembly PZT Micro-Actuator Positioning
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Solution Overview
Problem
Conventional disk drive systems face challenges in achieving precise positional control of read/write heads over high-density storage media due to inherent tolerances and susceptibility to damage from shocks, particularly affecting thin-film PZT micro-actuators.
Innovation Solution
The solution involves reducing the size of the suspension tongue region and eliminating or reducing the gap between the slider and the PZT element, with the slider being substantially fully mounted on an insulating layer, and balancing the weight around the dimple to enhance shock resistance and positional accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gap is maintained between the slider and PZT element, then the risk of PZT element damage during shocks is reduced, but the positional control accuracy and stability deteriorates
Solution Approach 1:
An insulating layer is introduced as an intermediary between the slider and the PZT element. This layer eliminates the need for a gap while preventing direct contact and potential damage during shocks. The insulating layer mediates the interaction between the slider and PZT element, allowing close positioning for accuracy while protecting against mechanical damage.
2Reliability
If the suspension tongue region size is reduced, then the shock resistance improves, but the structural strength and stability may worsen
Solution Approach 1:
The suspension tongue region employs composite material construction, combining materials with different properties to achieve both reduced size and maintained strength. The composite structure provides enhanced shock resistance while retaining sufficient structural integrity through the synergistic properties of the combined materials.
3Stability of the object's composition
If the slider is fully mounted on the insulating layer, then the positional stability during shocks improves, but the manufacturing complexity increases
Solution Approach 1:
The mounting process merges multiple functions into a single operation. The insulating layer serves simultaneously as the mounting substrate and the protective element, eliminating the need for separate mounting and protection steps. This integration simplifies the manufacturing process while achieving full slider mounting for enhanced stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves the stability and accuracy of head gimbal assemblies during shocks, reduces the risk of PZT element damage, and enhances the overall performance by balancing weight and eliminating the need for a gap, leading to increased track density and reduced head seeking time.
Implementation Method 1
The PZT micro-actuator is configured such that expansion and/or contraction of the PZT elements causes movement of the micro-actuator which, in turn, causes movement of the read/write head
Data Source
AI summary
Systems and methods for accurate position adjustment of thin-film PZT micro-actuators are provided. In certain example embodiments, a head gimbal assembly is provided. A suspension includes a suspension flexure located at one end of the suspension, and the suspension flexure includes a tongue region. At least one micro-actuator is mounted to a micro-actuator mounting region of the tongue region of the suspension flexure. Any gap between the slider and the at least one micro-actuator may be reduced and/or eliminated. A slider is substantially fully mounted on an insulating layer, and the insulating layer separates the slider from the at least one micro-actuator. The suspension flexure may be located substantially fully underneath the slider, and the tongue region of the suspension flexure may be substantially equally weighted around a dimple formed on the suspension. The rigidity of the suspension flexure may be increased by one or more supports formed thereon.