Gimbal Head Support Centroid Alignment for Resonance Control
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Solution Overview
Problem
Conventional head support mechanisms in magnetic disk devices face challenges in achieving high-speed precision positioning due to resonance issues caused by counterforce and wind turbulence, which limit the resonant frequency and accuracy of the magnetic head's positioning.
Innovation Solution
A head support mechanism with a slider mounted on a load beam, featuring a support projection, a gimbal part, a displacement member, and a counterbalance aligned along the symmetric axis of the gimbal part to minimize inertia mass and increase resonant frequency, thereby suppressing unnecessary vibrations and enhancing precision positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If counterbalance is configured to align centroid of revolving portion with support projection, then head positioning precision is improved, but resonant frequency of slider rotation mode decreases
Solution Approach 1:
The patent applies counterbalance portions to the gimbal part to align the centroid of the revolving portion (gimbal part + slider) with the support projection. This alignment eliminates counterforce generation during slider displacement, preventing resonance excitation of the load beam and improving positioning precision.
Solution Approach 2:
The patent positions the counterbalance portions at specific locations on the gimbal part (opposite to each other with respect to the slider rotation axis, and radially outward from the rotation axis) to dynamically balance the revolving portion. This dynamic balancing allows the system to maintain precision while managing resonant characteristics.
2Measurement precision
If counterbalance is shaped to bulge outwardly from both sides of head support mechanism, then centroid alignment is achieved, but wind turbulence influence increases
Solution Approach 1:
The patent positions the counterbalance portions asymmetrically with respect to the slider rotation axis - specifically, opposite to each other and radially outward. This asymmetric arrangement achieves centroid alignment while minimizing the projected area exposed to wind turbulence from disk rotation.
Solution Approach 2:
The counterbalance portions are arranged in a configuration that extends radially outward from the rotation axis rather than bulging outwardly from both sides of the head support mechanism. This dimensional repositioning reduces exposure to wind turbulence while maintaining balancing functionality.
3Stability of the object's composition
If inertial mass of rotary portion is increased for stability, then slider orientation stability improves, but resonant frequency of slider rotation mode decreases
Solution Approach 1:
The counterbalance portions provide the necessary inertial mass for stability while being strategically positioned to align the centroid with the support projection. This eliminates counterforce generation, allowing the system to achieve both stability and high resonant frequency that enables high-speed positioning.
Solution Approach 2:
The patent optimizes the mass and position parameters of the counterbalance portions to achieve the desired centroid alignment. By carefully controlling these parameters, the system achieves stability without excessive inertial mass that would lower the resonant frequency.
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 solution allows for high responsiveness and precision in positioning the magnetic head, increasing the resonant frequency to enable faster data recording and reproduction while reducing the influence of wind turbulence and unnecessary resonance.
Implementation Method 1
a counter balance aligned along a symmetric axis of the gimbal part so as to align a centroid of the gimbal part including the slider with the support projection
Implementation Method 2
align a centroid of the gimbal part including the slider with the support projection... minimize inertia mass of the revolving portion
Implementation Method 3
a displacement member arranged to revolve the slider around the support projection
Implementation Method 4
a gimbal part including the slider and arranged to support the slider in a revolvable manner around the support projection
Implementation Method 5
increasing the resonant frequency of the slider rotation mode which combines the slider and the gimbal part, an influence of a wind generated by a high speed rotation of a disk is reduced
Data Source
AI summary
A head support mechanism includes a slider on which a head element is mounted is arranged at a tip end part of a load beam. The head support mechanism includes a support projection arranged at the tip end part of the load beam, a gimbal part including the slider and arranged to support the slider in a revolvable manner around the support projection, a displacement member arranged to revolve the slider around the support projection, and a counter balance aligned along a symmetric axis of the gimbal part so as to align a centroid of the gimbal part including the slider with the support projection.