Constrained Layer Damper for Integrated Lead Suspension Vibration
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Solution Overview
Problem
In high-density magnetic storage devices, integrated lead suspension (ILS) vibration leads to track misregistration due to airflow-induced excitation, which existing solutions fail to adequately attenuate, requiring additional manufacturing processes and increasing costs.
Innovation Solution
The integration of a constrained layer damper (CLD) within the ILS design or applied as a sandwiched layer after assembly, utilizing a polyimide cover layer and dielectric materials to minimize vibration by applying the CLD directly to the ILS tail or encapsulating it during manufacturing, reducing the risk of delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If guide slots are formed in the actuator arm to minimize ILS vibration, then vibration attenuation is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The damping solution is segmented into discrete damping elements that can be positioned at specific locations along the actuator arm, rather than requiring complex structural modifications throughout the entire actuator arm. This allows targeted vibration attenuation while maintaining structural simplicity.
Solution Approach 2:
A damping layer is introduced as an intermediary element between the airflow excitation source and the ILS traces. This damping layer absorbs vibrational energy and prevents it from propagating to the head assembly, effectively attenuating vibration without modifying the actuator arm's structural complexity.
2Reliability
If drops of adhesive are used to secure the ILS to the actuator arm, then vibration attenuation is improved, but manufacturing precision and reliability worsen due to potential delamination
Solution Approach 1:
The damping layer is designed as a self-contained, disposable element that is applied to the actuator arm and remains in place through the lifecycle of the device. It eliminates the need for adhesive applications that require high precision and can fail over time, providing consistent vibration attenuation without delamination risks.
3Reliability
If a damping layer is applied to the ILS, then vibration attenuation is improved, but manufacturing complexity increases
Solution Approach 1:
The damping layer is applied to the actuator arm during the manufacturing process as a preliminary step before final assembly. This allows the damping element to be positioned and secured while the actuator arm is still in a convenient state for processing, simplifying the overall manufacturing sequence.
Solution Approach 2:
The damping layer is designed to be self-adhering or self-securing to the actuator arm surface, eliminating the need for complex bonding processes or additional fastening steps. This self-service characteristic reduces manufacturing complexity while ensuring reliable attachment.
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
The CLD effectively attenuates ILS vibration during both idle and seeking operations, minimizing off-track motion and enhancing signal integrity with minimal disruption to existing manufacturing processes, thereby improving the reliability and performance of disk drives.
Implementation Method 1
System and apparatus for vibration damping of integrated lead suspensions in high density magnetic storage devices
Implementation Method 2
What is proposed in this disclosure is the addition of a constrained layer damper (CLD) on the ILS that also minimizes the extent to which the ILS will vibrate
Data Source
AI summary
An integrated lead suspension (ILS) has a constrained layer damper (CLD) that attenuates vibration of the ILS. The CLD may be applied over an already assembled ILS such that the CLD is applied to the cover layer, to the base layer, or to both. Alternatively, the ILS may be encapsulated via a deposition process such that a damping layer is sandwiched between the conductor layer and the cover layer of the ILS, between the conductor layer and the dielectric layer of the ILS, or both.