Actuator Pivot Adhesive Barrier for Disk Drive Contamination
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Solution Overview
Problem
The high liquid particle count due to uncured adhesive squeeze-out between the actuator body and flex stiffener in magnetic hard disk drives contaminates components, reducing reliability and lifetime.
Innovation Solution
A barrier is positioned over the adhesive vent to prevent adhesive from entering the gap between the actuator body and flex stiffener, allowing excess adhesive to exit and ensuring proper curing, thus reducing contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is dispensed into the actuator body to bond the pivot bearing, then the pivot bearing is securely attached to the actuator body, but excess adhesive squeezes out through the adhesive vent into the gap between the actuator body and flex stiffener, causing contamination
Solution Approach 1:
A wick is introduced as an intermediary component between the adhesive vent and the gap between actuator body and flex stiffener. The wick absorbs excess adhesive that squeezes out during bonding, preventing it from contaminating the gap while allowing the bonding process to proceed normally. This mediator captures the harmful adhesive flow without interfering with the primary bonding function.
Solution Approach 2:
The wick acts as a flexible absorbent structure that can adapt to the space near the adhesive vent. Its fibrous structure allows it to flex and conform to the geometry of the actuator body interior while maintaining its adhesive absorption capability, effectively blocking contaminant pathways without rigid structural constraints.
2Object-affected harmful factors
If a barrier is positioned over the adhesive vent to prevent adhesive from entering the gap, then contamination is reduced, but the adhesive may not be able to exit properly, affecting curing
Solution Approach 1:
The wick is made of porous absorbent material that allows controlled interaction with adhesive. The porous structure enables the wick to absorb excess adhesive through capillary action while still permitting proper adhesive flow and curing vapor escape. This porous medium selectively filters adhesive based on its flow state and composition.
Solution Approach 2:
The wick serves as a mediator between the adhesive vent and the external environment, selectively allowing proper adhesive exit for curing while blocking excess adhesive from entering the gap. It mediates the conflicting requirements of adhesive flow and contamination prevention through its absorbent properties.
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 solution prevents contamination by ensuring the adhesive cures properly, enhancing the reliability and lifetime of the disk drive by minimizing liquid, solid, and gaseous contaminants.
Implementation Method 1
bonded thereto by a layer of adhesive
Implementation Method 2
A barrier is positioned over the adhesive vent to prevent adhesive from entering the gap
Implementation Method 3
The thin layer of adhesive squeeze out does not get cured during the baking process after pivot adhesive dispensing
Data Source
AI summary
One aspect of an actuator assembly configured for use in a disk drive includes an actuator body including a bore, an adhesive inlet port, and an adhesive vent, a pivot bearing disposed at least partially within the bore of the actuator body, an adhesive disposed between the pivot bearing and the actuator body, and a barrier coupled to the actuator body and positioned over the adhesive vent.