Magnetic Head Load Beam with Tilted Side Edges
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Solution Overview
Problem
Existing magnetic head suspensions face a trade-off between improving resonance characteristics and shock resistance, with increased rigidity enhancing resonance frequency but compromising shock resistance, and vice versa.
Innovation Solution
A magnetic head suspension design featuring a load beam portion with tilted side edges and reinforcement structures at inflection points, reducing mass while maintaining rigidity through strategically placed flanges or drawing structures, to enhance both resonance characteristics and shock resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rigidity of the load beam portion is increased to improve the resonance characteristic, then the resonance frequency increases, but the mass of the load beam portion increases, which deteriorates the shock resistance
Solution Approach 1:
The load beam portion is designed with non-uniform cross-sectional dimensions, where the width and thickness vary along the longitudinal direction. Specifically, the base end area has larger dimensions than the tip end area, creating local variations in rigidity that match the structural requirements at different positions while minimizing overall mass
Solution Approach 2:
The patent introduces tilt angles in the side edges of the load beam portion relative to the central longitudinal axis line. This dimensional change in the cross-sectional geometry allows the beam to achieve optimal rigidity distribution along its length without requiring uniform mass distribution, thereby improving shock resistance while maintaining resonance characteristics
2Strength
If the rigidity of the magnetic head suspension is increased to improve the resonance characteristic, then the resonance frequency increases, but the shock resistance deteriorates
Solution Approach 1:
The load beam portion features localized variations in cross-sectional dimensions with the intermediate area having different width and thickness compared to the base end area and tip end area. This local quality variation allows the structure to achieve high rigidity where needed for resonance performance while reducing mass in less critical areas to improve shock resistance
Solution Approach 2:
The load beam portion is designed with asymmetric cross-sectional dimensions where the width and thickness differ at various positions along the longitudinal axis. The base end area has larger dimensions than the tip end area, creating an asymmetric mass distribution that optimizes both rigidity for resonance and mass reduction for shock resistance
Data Source
AI summary
A magnetic head suspension includes a flexure portion, a load bend portion, a load beam portion, and a base portion. The load beam portion includes: a base end area continuously connected with the load bend portion; an intermediate area extending from the base end area toward a tip end side, and a tip end area extending from the intermediate area toward the tip end side to reach the magnetic head mount area. The base end area has first side edges tilted so as to gradually approach a central longitudinal axis line of the magnetic head suspension as the first side edges go toward the tip end side. The intermediate area has second side edges continuously connected with the first side edges and configured to be substantially parallel with the central longitudinal axis line or to be tilted to gradually approach the central longitudinal axis line as the second side edges go toward the tip end side.