Magnetic Head Load Beam Asymmetric Bending Design
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Solution Overview
Problem
Magnetic head suspensions face challenges in accurately positioning magnetic head sliders due to resonant vibrations from the first bending mode and first torsion mode, leading to displacement issues, and existing configurations complicate the bending process and are prone to flange portion deformation.
Innovation Solution
A magnetic head suspension design featuring a load beam part with paired flange portions bent towards the disk surface, a dimple protruding towards the head-mounting region, and controlled bending angles at specific lines to minimize displacement and prevent deformation, while maintaining manufacturability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the load beam part is bent with different bending directions at proximal-side and distal-side bending lines to adjust displacement, then the displacement amount of the magnetic head slider can be adjusted, but the bending process becomes difficult and flange portions are likely to be deformed
Solution Approach 1:
The patent applies asymmetry by making the bending directions at proximal-side and distal-side bending lines different from each other. Specifically, the load beam part is bent in a convex manner projecting away from the disk surface at one bending line while bending in a convex manner projecting toward the disk surface at the other bending line. This asymmetric bending configuration enables independent adjustment of displacement amounts in different directions, allowing precise control of the magnetic head slider position while maintaining manufacturability through systematic bending design
Solution Approach 2:
The patent utilizes parameter changes by adjusting the bending directions and angles at different bending lines to control the displacement characteristics. By changing the bending direction parameter at proximal-side versus distal-side bending lines, the system can independently tune the displacement amount for each mode of vibration, achieving precise positioning without excessive manufacturing complexity
2Measurement precision
If the load beam part is bent in a convex manner projecting away from the disk surface, then the displacement amount can be adjusted, but the flange portions are likely to be deformed
Solution Approach 1:
The patent applies asymmetry by making the bending directions at proximal-side and distal-side bending lines different from each other. Specifically, the load beam part is bent in a convex manner projecting away from the disk surface at one bending line while bending in a convex manner projecting toward the disk surface at the other bending line. This asymmetric bending configuration enables independent adjustment of displacement amounts in different directions, allowing precise control of the magnetic head slider position while maintaining manufacturability through systematic bending design
Solution Approach 2:
The patent applies local quality by applying different bending characteristics at different locations of the load beam part. The proximal-side bending line has one bending direction while the distal-side bending line has the opposite bending direction. This localized differentiation allows each region to contribute differently to the overall displacement control, achieving precise positioning while distributing manufacturing stress and reducing flange deformation risk
3Reliability
If paired flange portions are added to enhance rigidity, then resonant frequencies increase and vibration is reduced, but the structure becomes more complex and harder to bend without deformation
Solution Approach 1:
The patent applies asymmetry by making the bending directions at proximal-side and distal-side bending lines different from each other. Specifically, the load beam part is bent in a convex manner projecting away from the disk surface at one bending line while bending in a convex manner projecting toward the disk surface at the other bending line. This asymmetric bending configuration enables independent adjustment of displacement amounts in different directions, allowing precise control of the magnetic head slider position while maintaining manufacturability through systematic bending design
Solution Approach 2:
The patent applies segmentation by dividing the load beam part into distinct regions with different bending characteristics. The proximal-side bending line and distal-side bending line create segmented zones that can be independently controlled during manufacturing. This segmentation allows the complex rigid structure with flange portions to be manufactured through controlled sequential bending operations, reducing overall manufacturing difficulty
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
The design effectively reduces displacement due to both first bending mode and first torsion mode vibrations without increasing bending angles, preventing flange deformation and simplifying the manufacturing process.
Implementation Method 1
the magnetic head suspension resonates at the time when being swung around the swing center, the magnetic head slider is largely displaced from the target track. In particular, out of the various vibration modes possibly generated in the magnetic head suspension, the first bending mode and the first torsion mode have the resonance frequencies within the low frequency range.
Implementation Method 2
the main body portion is provided with a dimple that protrudes in the direction toward the disk surface so as to come in contact with a reverse surface of the head-mounting region
Implementation Method 3
the load beam part is bent at first and second bending lines in such a convex manner as to project in the direction toward the disk surface
Data Source
AI summary
A load beam part, which includes a plate-like main body portion facing a disk surface and paired flange portions bent from both side edges of the main body portion in a suspension width direction so as to extend toward a direction opposite from the disk surface, is bent at first and second bending lines in such a convex manner as to project in the direction toward the disk surface, the first bending line being positioned between the proximal end portion of the load beam part and the dimple in the suspension longitudinal direction and extending along the suspension width direction, the second bending line being positioned between the first bending line and the dimple in the suspension longitudinal direction and extending along the suspension width direction.