Magnetic Disk Shroud and Damper for Turbulence Control
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Solution Overview
Problem
The increasing recording density in magnetic disks leads to positioning accuracy issues due to high-speed gas flow turbulence and particle adhesion, which can cause arm vibration and data errors.
Innovation Solution
A magnetic disk device incorporating a shroud, rotary shaft, damper, and guide vane to control gas flow, reducing turbulence and particle entry, with an optional collection member to filter particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the magnetic disk rotates at high speed to increase recording density, then the recording capacity is improved, but the gas flow turbulence increases causing arm vibration and positioning accuracy to deteriorate
Solution Approach 1:
A damper is introduced as an intermediary component between the gas flow and the arm assembly. The damper absorbs and dissipates the turbulent gas flow energy before it reaches the arm, preventing vibration while allowing the high-speed rotation for increased recording density to continue
Solution Approach 2:
The harmful turbulent gas flow is converted into beneficial controlled flow by the damper structure. The damper transforms the chaotic turbulence into a more controlled flow pattern that does not cause vibration, allowing high-speed operation to proceed
2Productivity
If the magnetic disk rotates at high speed, then the recording capacity is improved, but particles adhere to the disk surface causing data errors
Solution Approach 1:
The damper acts as an intermediary barrier between the external environment and the disk surface. It filters and blocks particles from reaching the disk during high-speed rotation, preventing adhesion and data errors while maintaining the high-speed operation for improved recording capacity
3Temperature
If the gas flow speed increases to improve cooling or pressure control, then the thermal or pressure management is improved, but the turbulence increases causing arm vibration
Solution Approach 1:
The damper serves as a mediator between the high-speed gas flow and the mechanical components. It allows the beneficial cooling or pressure control effects of high-speed flow to continue while blocking the harmful vibration transmission to the arm assembly
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
Enhances positioning accuracy and reduces particle adhesion, minimizing disk surface damage and data errors by stabilizing gas flow and capturing particles.
Implementation Method 1
When the magnetic disk rotates at a high speed, the speed of the gas flow inside the device increases, and the turbulence also increases
Implementation Method 2
the speed of the gas flow inside the device increases
Data Source
AI summary
According to one embodiment, a magnetic disk device of an embodiment includes a rotary shaft, a shroud, and a damper. The rotary shaft rotates the plurality of disks. The shroud surrounds at least a part of the disk along the outer edge of the disk with a space from the outer edge of the disk. The damper is provided on a downstream side of the shroud with respect to a flow between the disks induced by rotation of the disks, and the damper has a portion intersecting with the flow and a portion along the flow.