Disk Device Blade Placement for Flow Stability
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Solution Overview
Problem
It is challenging to maintain the positioning accuracy of magnetic heads with respect to recording media in disk devices, particularly when the number of blades is insufficient to fill all gaps between the media, leading to potential turbulent fluid flow and disk flutter.
Innovation Solution
A disk device design where the number of first blades is smaller than the number of gaps, with blades strategically placed in some gaps to prevent turbulent fluid flow and improve positioning accuracy, while the housing's inner peripheral surfaces act as shrouds to regulate fluid flow around unbladed gaps, enhancing accuracy for all recording media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of blades is increased to fill all gaps between recording media, then turbulent fluid flow and disk flutter are prevented, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies partial action by placing blades only in selected gaps between recording media rather than all gaps. Specifically, blades are installed in gaps where turbulent flow most significantly affects positioning accuracy, while omitting blades from gaps where the effect is minimal. This selective approach achieves sufficient flow control to maintain positioning accuracy while reducing the total number of blades required, thereby lowering device complexity and manufacturing cost.
2Reliability
If blades are placed in all gaps between recording media, then fluid flow is regulated effectively, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by making the blade placement configuration non-uniform across different gaps. Each gap between recording media is evaluated based on local flow conditions and positioning accuracy requirements. Blades are strategically placed only in gaps where local flow turbulence exceeds a threshold level, while gaps with acceptable flow characteristics remain without blades. This localized approach achieves effective fluid flow regulation where needed while reducing overall manufacturing precision requirements.
3Productivity
If the number of recording media is increased to enhance storage capacity, then productivity improves, but positioning accuracy deteriorates due to increased gaps and fluid turbulence
Solution Approach 1:
The patent applies partial action by selectively placing blades in gaps between recording media based on their position and flow characteristics. When multiple recording media are stacked to increase storage capacity, blades are installed only in critical gaps where turbulence most impacts positioning accuracy, rather than in all gaps. This selective blade placement allows the system to maintain high positioning accuracy even with increased storage capacity from more recording media.
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 improves the positioning accuracy of magnetic heads by preventing turbulent fluid flow and disk flutter, even when blades cannot be placed in all gaps, maintaining high precision without significant structural modifications.
Implementation Method 1
The plurality of first blades are located in a plurality of gaps that are provided between the plurality of recording media... preventing turbulent fluid flow and disk flutter
Data Source
AI summary
According to one embodiment, a disk device includes a plurality of recording media, a plurality of magnetic heads, a plurality of blades, and a housing. The recording medium has a recording surface, is rotatable around a rotation axis extending in an axial direction intersecting the recording surface, and is aligned in the axial direction. The magnetic head is configured to read and write information from and to the plurality of recording media. The plurality of first blades forms a spoiler, and the first blades of the plurality are located in a plurality of gaps provided between the plurality of recording media. The housing is provided with an inner chamber in which the plurality of recording media, the plurality of magnetic heads, and the plurality of first blades are accommodated. The number of first blades is smaller than the number of gaps.