Trace Jumpers for Disk Drive Suspensions
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Solution Overview
Problem
Current disk drive head suspensions with wireless or integrated lead flexures face challenges in achieving low differential impedance and high bandwidth, which are essential for advanced read/write head technology.
Innovation Solution
The development of trace jumper and flexure constructions that incorporate interleaved trace configurations and integrated transmission line arrays, along with jumper assemblies, to provide low differential impedance and efficient manufacturing processes, such as additive and subtractive methods, to achieve high bandwidth signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wireless or integrated lead flexures are used in disk drive head suspensions, then mechanical integration is improved, but differential impedance and bandwidth performance deteriorate
Solution Approach 1:
The flexure is divided into multiple layers with traces segmented and distributed across different layers. This segmentation allows each trace layer to be optimized for electrical performance while maintaining mechanical integration, resolving the contradiction between mechanical integration and electrical performance.
Solution Approach 2:
The patent transitions from planar traces to three-dimensional interleaved trace configurations across multiple layers. By adding the vertical dimension with interleaved layers, the design achieves both mechanical integration and improved differential impedance performance simultaneously.
2Productivity
If traditional trace configurations are used, then manufacturing is simpler, but bandwidth and signal transmission performance deteriorate
Solution Approach 1:
The patent employs multi-layer interleaved trace configurations that utilize the vertical dimension. This three-dimensional arrangement increases signal bandwidth by reducing electromagnetic interference while the traces remain integrated into the flexure structure, balancing performance improvement with manufacturing feasibility.
Solution Approach 2:
The flexure uses composite construction with multiple layers of conductive traces separated by insulating layers. This composite structure enables high bandwidth signal transmission by controlling electromagnetic fields while maintaining mechanical flexibility and manufacturability.
3Reliability
If low differential impedance is achieved through trace design, then signal transmission quality improves, but manufacturing complexity increases
Solution Approach 1:
The trace system is segmented into multiple layers with specific geometric patterns and spacing. This segmentation enables precise control of differential impedance for high-quality signal transmission while each individual layer remains relatively simple to manufacture using standard PCB techniques.
Solution Approach 2:
The multi-layer composite trace construction with controlled spacing and geometry achieves low differential impedance. The composite structure of conductive traces and insulating layers provides the necessary electrical performance while remaining manufacturable through established multi-layer circuit board processes.
Data Source
AI summary
Jumper constructions for an integrated lead flexure for a disk drive head suspension include a conductive base layer, an insulating layer over the base layer, a plurality of traces arranged on the insulating layer, and an isolated conductor layer arranged under the insulating layer. The plurality of traces include a first trace and a second trace and the isolated conductor layer is electrically isolated from the conductive base layer and electrically connects the first and second traces.