Interleaved Flexure Circuit Slits for Disk Drive Bandwidth
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Solution Overview
Problem
Conventional interleaved circuits in disk drive flexures have limited ability to achieve low-loss broadband characteristics, particularly in high-frequency bands, which restricts their capacity for high-speed data transfer.
Innovation Solution
The interleaved circuit design includes a metal base with an opening, an insulating layer with slits and air gaps between branch conductors, and a cover resin layer, allowing for increased bandwidth by forming slits in the insulating and cover resin layers, and arranging them transversely or longitudinally to enhance frequency band performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an opening is simply formed in the metal base to enhance frequency band, then the frequency band can be partially improved, but low-loss broadband characteristics cannot be fully achieved
Solution Approach 1:
The insulating layer is divided into multiple segments by forming slits that extend in the longitudinal direction. These slits create multiple air gaps between adjacent insulating layer segments, which collectively provide the desired low-loss broadband characteristics across the frequency band while maintaining structural integrity.
Solution Approach 2:
Air gaps are introduced as intermediary elements between the metal base and the conductors. These air gaps, formed by slits in the insulating layer, serve as low-loss transmission paths for high-frequency signals, enabling broadband performance without compromising signal integrity.
2Use of energy by moving object
If multi-trace transmission lines are used to reduce impedance and inductance, then energy consumption is reduced, but attenuation in high-frequency range increases
Solution Approach 1:
The insulating layer is designed with non-uniform properties by introducing slits at specific locations. The air gaps created by these slits provide localized low-loss regions that specifically address high-frequency attenuation problems while maintaining the impedance-matching benefits of multi-trace transmission lines.
Solution Approach 2:
The circuit structure combines metal conductors with a composite insulating system that includes both solid insulating material and air gaps. This composite structure leverages the low dielectric loss of air in high-frequency regions while maintaining the electrical performance benefits of the insulating layer.
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 design significantly improves the frequency band and enables high-speed data transfer by reducing dielectric loss and increasing the number of air gaps, making it suitable for broadband applications beyond 11.5 GHz.
Implementation Method 1
a slit which extends along a longitudinal direction of the insulating layer and comprises a pair of opposite walls and an air gap formed between both opposite walls
Data Source
AI summary
An interleaved circuit has first branch conductors branching from a first conductor, second branch conductors branching from a second conductor, a metal base, an insulating layer of a dielectric, and a cover resin layer. The metal base comprises an opening. The first branch conductors and the second branch conductors are arranged alternately in a transverse direction of the insulating layer. A slit is formed in the insulating layer and the cover resin layer. The slit comprises a pair of opposite walls and an air gap between the opposite walls. Air introduced into the air gap forms an air layer. The slit extends longitudinally relative to the interleaved circuit along at least a part of the branch conductors.