Magnetic Head Suspension Vibration Control via Load Beam Bending
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Solution Overview
Problem
Magnetic head suspensions face challenges in minimizing displacement of the magnetic head slider due to vibrations in torsion and sway modes, particularly in maintaining positioning accuracy and preventing resonant vibrations, especially when the frequency of the drive signal is raised.
Innovation Solution
The magnetic head suspension is designed with a load beam part and a load bending part, featuring bending portions and a flexure part, where the leaf spring is bent at specific angles and positions to adjust the pressing load and torsion center lines, ensuring that the condition L1≦0.3*L and 0.6*L≦L2 is satisfied, thereby reducing gains in torsion modes and increasing resonant frequencies in sway modes without compromising torsion mode frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the frequency of the drive signal is raised to rapidly move the magnetic head slider to the target track, then the positioning speed is improved, but vibrations in torsion and sway modes are generated that deteriorate positioning accuracy
Solution Approach 1:
The patent applies parameter changes by adjusting the bending angle and position of bending portions in the load beam part and load bending part. Specifically, the bending angle at the bending portion in the load beam part is set to a specific range (10° to 30°), and the position of the bending portion is optimized along the suspension lengthwise direction. These parameter adjustments modify the vibration characteristics of the magnetic head suspension, reducing the displacement of the magnetic head slider due to torsion mode vibrations while maintaining the ability to rapidly position the slider on the target track.
2Manufacturing precision
If the resonant frequency in sway mode is raised to prevent sway mode vibrations, then positioning accuracy is improved, but the structural design becomes more complex
Solution Approach 1:
The patent applies local quality by providing bending portions at specific locations in the load beam part and load bending part. The bending portion in the load beam part is positioned at a specific location along the suspension lengthwise direction with a controlled bending angle, while the bending portion in the load bending part is positioned at an optimized location. This localized structural modification selectively affects the torsion and sway mode vibration characteristics without requiring complex overall structural changes, thereby raising the resonant frequency in sway mode while maintaining design simplicity.
3Manufacturing precision
If the load beam part is configured with high rigidity in the suspension width direction to raise resonant frequency, then sway mode vibration is reduced, but the pressing load capability is compromised
Solution Approach 1:
The patent applies segmentation by dividing the load beam part into multiple sections with different rigidity characteristics. The load beam part includes a bending portion that creates a localized flexibility zone, while other portions maintain higher rigidity. This segmented structure allows the suspension to have high overall rigidity in the suspension width direction to raise the resonant frequency and reduce sway mode vibrations, while the localized bending portion preserves the ability to generate sufficient pressing load on the magnetic head slider.
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 reduces the displacement of the magnetic head slider from the target track due to vibrations in torsion modes and prevents sway mode vibrations, ensuring accurate positioning and rapid movement of the magnetic head slider to the target track.
Implementation Method 1
a load bending part including a leaf spring that has a proximal end portion connected to the supporting part and generates a load for pressing a magnetic head slider toward the disk surface
Implementation Method 2
vibrations in various modes are generated in the magnetic head suspension when it is swung by the actuator. The vibrations deteriorate a positioning accuracy of the magnetic head slider with respect to the target track
Data Source
AI summary
A magnetic head suspension includes a supporting part, a load bending part, a load beam part and a flexure part, and is configured so that a condition of L1≦0.3*L and 0.6*L≦L2 is satisfied assuming that a length of the leaf spring in a suspension lengthwise direction that extends from a distal edge of the supporting part to a proximal end portion of the load beam part is represented by “L”, a distance in the suspension lengthwise direction from the distal edge of the supporting part to the proximal side-bending line is represented by “L1” and a distance in the suspension lengthwise direction from the distal edge of the supporting part to the distal side-bending line is represented by “L2”.