Suspension Board Warping Prevention via Margin Fragile Portions
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Solution Overview
Problem
Conventional suspension boards with circuit assembly sheets experience warping and reduced handling ability due to higher stiffness in margin regions caused by residual stress during winding around a roll.
Innovation Solution
Incorporating fragile portions in the margin regions by partially removing the metal supporting layer, specifically forming second opening portions, to reduce stiffness and prevent warping, while maintaining handling ability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the metal sheet is wound around a roll to produce suspension boards with circuits, then the suspension boards can be manufactured in a continuous process, but warping occurs in the margin regions due to higher stiffness and residual stress
Solution Approach 1:
The patent applies local quality by creating fragile portions only in the margin regions while maintaining the integrity of the assembly provided region. This is achieved by forming second opening portions that extend through the metal supporting layer in specific locations (margin regions) but not in the assembly provided region, allowing different structural properties in different areas of the same sheet.
Solution Approach 2:
The patent changes the structural parameter of the metal supporting layer by forming second opening portions in the margin regions. This modifies the stiffness parameter locally, reducing it in the margin regions while maintaining it in the assembly provided region, thereby preventing warping during winding.
2Ease of operation
If the stiffness of the margin regions is reduced to prevent warping, then handling ability improves, but the structural integrity of the metal sheet may be compromised
Solution Approach 1:
The patent ensures that the fragile portions are located only in the margin regions and not in the assembly provided region. The second opening portions are formed specifically in the margin regions, allowing the margin regions to be more flexible for handling while the assembly provided region maintains its structural integrity for supporting suspension boards.
Solution Approach 2:
The patent segments the metal sheet into different functional regions: the assembly provided region that maintains full structural integrity for supporting suspension boards, and the margin regions that have fragile portions formed to improve handling ability. This segmentation allows each region to have optimized properties for its specific function.
Data Source
AI summary
A suspension board with circuit assembly sheet includes an assembly provided region provided with a plurality of suspension boards with circuits at spaced intervals to each other along one direction and a margin region provided at least at one side in a crossing direction with respect to the one direction of the assembly provided region. In the assembly provided region, a first opening portion is provided between the suspension boards with circuits that are adjacent to each other and in the margin region, a fragile portion is provided.