Integrated Lead Flexure with Impedance-Matched Trace Configurations
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Solution Overview
Problem
Current disk drive head suspension technologies face challenges in achieving high bandwidth and low impedance electrical characteristics along with low stiffness and small footprint mechanical properties, while also requiring efficient manufacturing and impedance matching with preamplifier and write head components.
Innovation Solution
The development of an integrated lead flexure with multiple trace configurations, including interleaved, stacked, and ground plane traces, which are impedance matched and optimized for electrical and mechanical performance, allowing for efficient manufacturing and improved mechanical and electrical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traces are designed for high bandwidth and low impedance electrical characteristics, then electrical performance is improved, but mechanical stiffness increases and footprint increases
Solution Approach 1:
The patent applies different trace configurations in different regions of the flexure. The tail region uses interleaved traces optimized for electrical performance, while the gimbal region uses stacked traces optimized for mechanical properties. This local differentiation allows each region to have trace characteristics tailored to its specific functional requirements without compromising the other regions.
Solution Approach 2:
The flexure is divided into distinct regions (tail and gimbal) with different trace configurations. The tail portion contains interleaved trace sections, while the gimbal portion contains stacked trace sections. This segmentation allows independent optimization of electrical and mechanical properties in different parts of the same component.
2Reliability
If traces are designed for high bandwidth and low impedance electrical characteristics, then electrical performance is improved, but footprint increases
Solution Approach 1:
The patent transitions from planar trace layouts to three-dimensional stacked trace configurations. By utilizing the vertical dimension with multiple trace layers stacked above each other, the design achieves high bandwidth and low impedance electrical characteristics without proportionally increasing the horizontal footprint, as the traces occupy different vertical levels rather than spreading out horizontally.
3Reliability
If different impedance matching is required for preamplifier and write head, then electrical performance is improved, but device complexity increases
Solution Approach 1:
The patent implements region-specific trace configurations where the tail region uses interleaved traces optimized for preamplifier impedance matching, while the gimbal region uses stacked traces optimized for write head impedance matching. This local quality differentiation allows each region to provide the appropriate electrical characteristics for its connected component without requiring a completely different design approach throughout the entire flexure.
Data Source
AI summary
An integrated lead head suspension flexure includes a mounting region, a gimbal extending distally from the mounting region and having bond pads, and a tail extending proximally from the mounting region and having terminal pads. First trace sections having a first structural configuration, such as interleaved traces, are electrically connected to the terminal pads and extend across the tail and mounting region. Second trace sections having a second structural configuration different than the first structural configuration, such as ground plane traces, are electrically connected to the bond pads and extend across the gimbal. Transition structures electrically connect the first trace sections to the second trace sections. The first and second trace sections impedance match the different impedances at the bond pads and terminal pads.