Partial Etched Polyimide Adhesive Containment for Disk Drive Suspensions
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Solution Overview
Problem
Current disk drive suspensions face challenges in manufacturing efficiency due to difficulties in controlling the placement of non-conductive epoxy, leading to electrical shorts and low yields, as it is hard to prevent voids or excessive epoxy from causing short circuits between conductive and non-conductive materials.
Innovation Solution
An adhesive containment structure is introduced, featuring a partial etched insulation layer that forms a gap to house adhesive, ensuring the microactuator is securely attached without electrical shorts, using insulating materials like polyimide and conductive adhesives to maintain electrical integrity and prevent shorts between conductive epoxy and metal layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If non-conductive epoxy is used to attach microactuators, then the microactuator is securely attached to the suspension, but electrical shorts occur due to voids or excessive epoxy between conductive and non-conductive materials
Solution Approach 1:
The insulation layer is divided into multiple segments or portions with gaps between them. These segmented insulation portions allow controlled placement of adhesive material while maintaining electrical isolation. The segmentation prevents continuous conductive paths that could cause shorts while still providing secure attachment points for microactuators.
Solution Approach 2:
The insulation layer has different properties in different locations - some areas have continuous insulation while other areas have gaps or reduced insulation thickness. This local variation allows the adhesive to be placed precisely where needed for attachment while maintaining electrical insulation in critical areas, resolving the conflict between attachment strength and electrical integrity.
2Ease of manufacture
If traditional adhesive application methods are used, then assembly is simple, but manufacturing precision is poor due to difficulty in controlling adhesive placement
Solution Approach 1:
The insulation layer is pre-formed with integrated gaps, recesses, or voids at specific locations before the adhesive application step. This preliminary structuring of the insulation layer guides the adhesive to precise locations automatically during assembly, eliminating the need for complex adhesive placement control mechanisms while maintaining high manufacturing precision.
Solution Approach 2:
The segmented insulation layer acts as an intermediary structure that mediates between the simple adhesive application process and the precise attachment requirement. The insulation gaps and recesses serve as physical guides that channel the adhesive to correct locations, transforming a simple but imprecise process into a precise one without adding complex control systems.
3Reliability
If adhesive is applied to ensure microactuator attachment, then attachment reliability improves, but electrical shorts increase due to adhesive bridging conductive paths
Solution Approach 1:
The insulation layer is segmented into discrete portions with gaps between them, creating isolated adhesive containment zones. Each segment provides a localized attachment area where adhesive can be applied reliably without bridging to adjacent conductive elements. The segmentation physically separates potential short circuits while maintaining attachment functionality.
Solution Approach 2:
Gaps or recesses are extracted or removed from the continuous insulation layer to create adhesive containment features. These extracted regions provide dedicated spaces for adhesive placement that are electrically isolated from surrounding conductive paths, allowing reliable attachment while eliminating the short circuit hazard that would exist with continuous insulation.
Data Source
AI summary
Embodiments of an adhesive containment structure are provided herein. The suspension includes a base portion that includes a metal support layer, an insulation layer including an insulating material on the metal support layer, and a signal conductor layer. The suspension includes a gimbaled portion, a microactuator adhered to the support layer. The suspension also includes an adhesive containment structure, the adhesive containment structure includes a first portion of the insulating material, a second portion of the insulating material, and a third portion of the insulating material, the first and second portions of the insulating material being separated by a gap, and the third portion of the insulating material disposed within the gap. Adhesive is disposed within the gap of the adhesive containment structure, the adhesive adhering the microactuator to the third portion of the insulating material.