Baseplate Torsion Axis Optimization for Head Positioning
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Solution Overview
Problem
Conventional magnetic disc drive head suspension systems face challenges in accurately positioning the head due to increased track density, leading to difficulties in centering the head over the desired track, which results in significant lateral displacement caused by baseplate torsion modes, reducing the overall bandwidth of the tracking system.
Innovation Solution
The implementation of a tilted or mass-shifted baseplate design that optimizes the torsion axis to pass near or through the head, reducing lateral displacement and off-track motion by shifting the mass distribution closer to the disc surface, thereby eliminating or minimizing the baseplate torsion mode's impact on head positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If track density is increased to decrease size and increase storage density, then storage capacity is improved, but head positioning accuracy deteriorates due to increased difficulty in centering the head over the desired track
Solution Approach 1:
The patent changes the geometric parameters of the baseplate by introducing a tilted section, which alters the torsion axis location. This parameter change allows the torsion axis to pass near the head, thereby reducing lateral displacement and improving head positioning accuracy while maintaining high track density
2Ease of manufacture
If conventional baseplate design is used, then manufacturing simplicity is maintained, but lateral displacement increases due to baseplate torsion modes
Solution Approach 1:
The patent introduces asymmetry into the baseplate design by adding a tilted section. This asymmetric geometry shifts the torsion axis location from the conventional centered position to a position that passes near the head, thereby reducing lateral displacement caused by baseplate torsion modes while remaining manufacturable
3Device complexity
If single actuation source is used, then device complexity is reduced, but positioning accuracy deteriorates due to increasing difficulty in accurately positioning the head
Solution Approach 1:
The patent changes the mechanical parameters of the baseplate (tilted section geometry) to optimize the torsion axis location. This parameter optimization enables the existing single actuation source to achieve better positioning accuracy by minimizing lateral displacement, thereby improving performance without increasing device complexity
Data Source
AI summary
In one implementation, the presently disclosed technology teaches an apparatus with a head attached to an end of a baseplate. The baseplate includes a tilted section that causes a torsion axis of the baseplate to pass near the head. In another implementation, the presently disclosed technology teaches an apparatus with a load beam attached to a baseplate. The apparatus also includes a head attached to an opposite end of the load beam from the baseplate. The baseplate includes a mass-shifted section that causes a torsion axis of the apparatus to pass through the head. In yet another implementation, the presently disclosed technology teaches a method for reducing baseplate resonance amplitude. The method includes shifting a baseplate mass on a suspension toward an adjacent disc surface to move a baseplate torsion axis to pass near a head.