Vertically Offset Hinge Suspension for Disc Flutter Compensation
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Solution Overview
Problem
As track densities increase in data storage systems, the suspension and control circuitry face challenges in accurately positioning transducers over desired data tracks due to relative motion between the transducer and disc caused by disc flutter, leading to misregistration and limited storage capacity.
Innovation Solution
A suspension with a vertically offset hinge structure and multiple layer laminate material, featuring a rotating hinge and preformed twist deformation, which minimizes relative motion between the transducer and disc by synchronizing lateral motion with disc flutter, thereby reducing off-track motion and enhancing track following precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If track density is increased, then storage capacity is improved, but positioning precision deteriorates due to disc flutter induced misregistration
Solution Approach 1:
The suspension system incorporates a rotating hinge that allows dynamic adjustment of the load beam angle. This dynamic mechanism enables the suspension to adapt to disc flutter conditions by rotating the load beam to compensate for radial displacement, thereby maintaining positioning precision even as track density increases
Solution Approach 2:
The system changes the angular parameter of the load beam through the rotating hinge mechanism. By adjusting the load beam angle in response to disc flutter, the system compensates for track misregistration and maintains accurate transducer positioning, resolving the contradiction between high track density and positioning precision
2Device complexity
If a conventional single-layer hinge structure is used, then device complexity is reduced, but off-track motion due to disc flutter cannot be effectively compensated
Solution Approach 1:
The hinge structure is segmented into multiple layers with distinct functional characteristics. The multi-layer laminate construction allows different layers to provide different mechanical properties, enabling effective compensation of disc flutter while managing overall device complexity through modular design
Solution Approach 2:
The hinge structure uses composite laminate materials combining layers with different mechanical properties. This composite construction provides enhanced flexibility and damping characteristics that effectively compensate for disc flutter, achieving superior track following precision without excessive complexity
3Strength
If the load beam is rigid, then structural strength is improved, but ability to compensate for disc flutter deteriorates
Solution Approach 1:
The load beam is designed with dynamic characteristics through the rotating hinge mechanism, allowing it to adapt its angular position in response to disc flutter. This dynamic capability enables the beam to compensate for flutter while maintaining sufficient structural strength through appropriate material selection and geometric design
Solution Approach 2:
The system changes the angular orientation parameter of the load beam dynamically. This parameter change allows the beam to adapt to varying operational conditions and compensate for disc flutter, while the beam's physical strength is maintained through proper structural design
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 vertically offset hinge structure and localized twist in the load beam effectively reduce off-track motion due to disc flutter, maintaining precision and reducing the contribution of the second bending mode to head off-track motion, thus improving data storage accuracy and capacity.
Implementation Method 1
A rotating hinge between the proximal and distal ends rotates the distal end about the longitudinal axis in response to vertical motion of the distal end relative to the proximal end
Implementation Method 2
a preformed twist deformation, which is confined to an area on the suspension that is entirely distal to the rotating hinge and which twists the distal end about the longitudinal axis relative to the proximal end in a direction opposite to rotation by the rotating hinge
Data Source
AI summary
A suspension is provided, which has a base, a load beam and a hinge structure. The hinge structure and at least one of the base and the load beam are formed of a single continuous piece of multiple layer laminate material, which includes first and second layers. The hinge structure includes a first beam formed by the first layer and a second beam formed by the second layer. The first layer is absent along the second beam and the second layer is absent along the first beam such that the first and second beams are vertically offset from one another. The first and second beams extend between the base and the load beam.