Disk Drive Flexure Grounded Substrate ESD Protection
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Solution Overview
Problem
Conventional disk drive units face challenges with electrostatic discharge (ESD) protection during manufacturing, as existing solutions are complex and costly, and there is a need for improved ESD protection structures that minimize damage and reduce manufacturing costs while enhancing electrical performance.
Innovation Solution
A suspension with a flexure comprising a conductive substrate and a dielectric layer, where electrical traces are connected via conductive vias to the substrate, forming an ESD bleed path, and the substrate is partially etched to control resistance values, eliminating the need for additional components like trace stubs in electroplating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ESD protection structures are used, then ESD damage is prevented, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the ESD protection function with the existing flexure structure by integrating conductive vias directly into the flexure substrate. The flexure serves dual purposes: mechanical support and ESD protection pathway, eliminating the need for separate ESD protection components and reducing overall device complexity.
Solution Approach 2:
The flexure structure is designed to perform multiple functions simultaneously: it provides mechanical flexibility and support while also serving as an ESD protection pathway through integrated conductive vias. This multi-functionality reduces the number of separate components needed and simplifies the overall structure.
2Reliability
If conventional ESD protection structures are used, then ESD damage is prevented, but manufacturing cost increases
Solution Approach 1:
The ESD protection function is merged with the flexure manufacturing process itself. Conductive vias are formed during the standard flexure fabrication sequence, eliminating the need for additional ESD protection assembly steps and reducing manufacturing complexity and cost.
Solution Approach 2:
The flexure structure serves its own ESD protection function through self-integrated conductive vias formed during its manufacturing process. The structure protects itself without requiring external ESD protection components or additional assembly operations.
3Reliability
If additional components are added for ESD protection, then ESD damage is reduced, but electrical performance deteriorates
Solution Approach 1:
By merging the ESD protection function into the flexure structure itself through integrated conductive vias, the patent eliminates the need for separate ESD protection components that would add electrical complexity. The unified structure maintains simpler electrical pathways and better signal integrity while providing ESD protection.
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 effectively minimizes ESD damage, reduces manufacturing costs, and improves electrical performance by providing a simple ESD protection system with enhanced bandwidth and impedance continuity.
Implementation Method 1
A suspension with electrostatic discharge (ESD) protection structure
Implementation Method 2
at least one conductive via is formed at a certain position on the electrical trace to connect the electrical trace with the conductive substrate
Implementation Method 3
a dielectric layer formed on the conductive substrate
Data Source
AI summary
A suspension includes a flexure including a conductive substrate, and a dielectric layer formed on the conductive substrate, and the conductive substrate being grounded; and a plurality of electrical traces formed on the dielectric layer and extending from a leading portion to a trailing portion of the flexure, and the electrical traces at least having a pair of read traces. At least one via is formed at certain position on the read traces to connect the read traces with the conductive substrate that is etched partially. It can minimize ESD damage during various stages of manufacturing process of the disk drive unit, reduce manufacturing cost, and also improve electrical performance of the suspension interconnection.