Wired Circuit Board Segmented Wires for Broadband and Elasticity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional suspension boards in magnetic disk devices face challenges in achieving both broadband capabilities and miniaturization while maintaining excellent elasticity, as increasing wire width and interval sizes can compromise device size and elasticity.
Innovation Solution
A wired circuit board design featuring an insulating layer with wires having distinct portions: a first portion with a larger total sum of line width and interval for broadband, and a second portion with a smaller total sum and thickness for elasticity and miniaturization, with a thickness ratio of 1.1 or more between these portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the width of wires and intervals between wires are increased to achieve broadband capability, then the broadband performance is improved, but the device size is enlarged and elasticity is compromised
Solution Approach 1:
The suspension board is divided into two distinct portions: a first portion with larger wire width and interval for broadband performance, and a second portion with smaller wire width and interval for compact size and elasticity. This segmentation allows each region to be optimized for its specific function without compromising the other.
Solution Approach 2:
Different regions of the suspension board are assigned different structural characteristics. The first portion has increased wire width and interval to achieve broadband capability, while the second portion maintains smaller dimensions for elasticity and miniaturization. This local differentiation resolves the contradiction by applying appropriate properties only where needed.
2Adaptability or versatility
If the thickness of wires is increased to achieve broadband capability, then the broadband performance is improved, but the elasticity of the insulated suspension is compromised
Solution Approach 1:
The suspension board thickness is segmented into two portions with different thickness characteristics. The first portion has increased thickness to support broadband operation, while the second portion maintains reduced thickness to preserve elasticity. This allows the structure to achieve broadband capability without sacrificing overall elastic performance.
Solution Approach 2:
The thickness property is differentiated locally across the suspension board. The first portion features greater thickness for broadband performance, while the second portion features lesser thickness for elasticity. This local quality variation enables simultaneous achievement of broadband capability and elastic flexibility.
3Adaptability or versatility
If the wire width and interval are increased for broadband, then the characteristic impedance matching is improved, but the device complexity and size are increased
Solution Approach 1:
The suspension board is segmented into two portions with different wire dimensions. The first portion has larger wire width and interval for improved characteristic impedance matching and broadband performance, while the second portion has smaller dimensions. This segmentation achieves impedance matching without requiring complex impedance transformation structures throughout the entire device.
Solution Approach 2:
The wire width and interval properties are optimized locally in the first portion to achieve characteristic impedance matching for broadband operation, while the second portion maintains compact dimensions. This local optimization simplifies the overall device structure compared to implementing complex impedance matching networks throughout the entire suspension board.
Data Source
AI summary
A wired circuit board includes an insulating layer and a plurality of wires disposed at one-side surface in a thickness direction of the insulating layer at spaced intervals to each other. The plurality of wires have one pair of wires in parallel, the plurality of wires continuously have a first portion and a second portion in which the total sum of a line width of one wire of one pair of wires and an interval between one pair of wires is smaller than that of the first portion, and a thickness T1 of the first portion is large with respect to a thickness T2 of the second portion.