Magnetic Head Load Beam Inflection Point Design
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Solution Overview
Problem
Existing magnetic head suspensions face challenges in reducing resonant vibrations in the second torsion mode, making it difficult to prevent displacement of the magnetic head slider due to these vibrations, as adjusting the bended position of the load bending part is not effective in minimizing the displacement caused by resonant vibrations in this mode.
Innovation Solution
The magnetic head suspension design includes a load beam part with a plate-like main body and flange portions, where the side edges are inclined at specific angles, and a flexure part supported by the load beam and supporting parts, with a distance 'a' between the supporting part's distal end and inflection point set to 0.78 L≦a≦1.13 L, to raise the resonant frequency in the second torsion mode and prevent resonant vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the load beam part is designed with conventional side edge configurations, then the structure is simple to manufacture, but the resonant frequency in the second torsion mode remains low causing slider displacement
Solution Approach 1:
The load beam part is designed with different inclination angles in different regions: the proximal end region has a first inclination angle while the distal end region has a second inclination angle that is smaller than the first. This local variation in geometric properties optimizes the resonant frequency in the second torsion mode without requiring complete structural redesign
Solution Approach 2:
Instead of redesigning the entire load beam part, only specific regions (proximal and distal end regions) are modified with different inclination angles. This partial modification is sufficient to raise the resonant frequency and reduce slider displacement while maintaining manufacturing simplicity
2Reliability
If the bended position of the load bending part is adjusted, then the resonant vibration in the first torsion mode can be reduced, but the resonant vibration in the second torsion mode cannot be effectively minimized
Solution Approach 1:
The inclination angles of the side edges in different regions of the load beam part are changed as key parameters. By setting the second inclination angle to be smaller than the first inclination angle, the resonant frequency in the second torsion mode is raised, effectively controlling slider displacement for this vibration mode
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 configuration effectively raises the resonant frequency in the second torsion mode, reducing the displacement of the magnetic head slider due to resonant vibrations in both the first and second torsion modes, thereby enhancing positioning accuracy by minimizing vibrations.
Implementation Method 1
raise the resonant frequency in the second torsion mode and prevent resonant vibrations
Data Source
AI summary
Each of side edges of a main body portion of a load beam part includes a proximal end region inclined at a first inclination angle so as to come closer to a suspension longitudinal center line as it goes from proximal to distal sides, and a distal end region inclined at a second inclination angle smaller than the first inclination angle so as to come closer to the center line as it goes from a proximal side connected via an inflection point to a distal end of the proximal end region to a distal side.