Multi-piece Head Gimbal Assembly Stiffness
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Solution Overview
Problem
Hard disk drives face issues with off-track movement and potential damage due to resonance frequency matching, which affects data accuracy and component longevity.
Innovation Solution
A head gimbal assembly design where the gimbal and flexure are separated and stacked, allowing for increased stiffness and higher resonance frequencies, reducing the amplitude of resonance modes and improving positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the flexure and gimbal are integrated as a single piece, then the structure is simpler and easier to manufacture, but the gimbal cannot achieve higher stiffness and the resonance frequencies remain lower
Solution Approach 1:
The patent divides the previously integrated flexure and gimbal into separate components. The gimbal is now a distinct piece stacked on top of the flexure, allowing independent optimization of each component's stiffness and mechanical properties without being constrained by a unified structure.
2Reliability
If the resonance frequency modes of the HGA are excited, then the slider experiences off-track movement affecting data accuracy, but increasing stiffness to raise resonance frequencies may complicate the structure
Solution Approach 1:
The patent changes the physical parameters of the gimbal by separating it from the flexure, which enables adjustment of stiffness characteristics. This parameter modification raises the resonance frequencies of the HGA, moving them away from excitation frequencies and reducing off-track movement of the slider.
3Strength
If the gimbal is made narrower by separating it from the flexure, then the stiffness increases and resonance modes are controlled, but the manufacturing precision requirements may increase
Solution Approach 1:
The patent transitions from a planar integrated structure to a stacked three-dimensional configuration. By stacking the narrower gimbal on top of the flexure, the design achieves higher stiffness in critical directions while managing manufacturing precision through the modular assembly approach.
Data Source
AI summary
A head gimbal assembly for a hard disk drive includes a slider, a load beam, a gimbal, and a flexure. The gimbal is disposed between the load beam and the slider. The gimbal is configured to provide motive support to the slider as the slider moves in proximity to a media surface. The flexure is disposed between the gimbal and the slider. The flexure includes an electrical trace ribbon configured to provide electrical signal pathways to and from active components of the head gimbal assembly.