Disk Drive Slider With Recessed Cavities For Pressure Control
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Solution Overview
Problem
Existing slider designs for disk drive data storage devices face issues with lubricant pickup, high peak pressure, and insufficient stiffness, which affect fly-height and magnetic interfacing performance.
Innovation Solution
The slider features a unique topography with multiple air bearing surfaces and recessed cavities that distribute air pressure, reducing peak pressure and inhibiting lubricant accumulation, while providing increased stiffness through pressurized cavities and a recessed shelf to mitigate stagnation areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the slider uses a conventional air bearing surface design, then it can maintain fly-height above the disk, but high peak pressure occurs between the slider and disk which contributes to lubricant pickup
Solution Approach 1:
The patent applies local quality by creating a recessed region with a lower surface in front of the air bearing surface. This recessed area has different topography and pressure characteristics compared to the main ABS, allowing it to serve as a lubricant trap while the ABS maintains fly-height. The localized modification of surface geometry addresses the pressure distribution issue without compromising overall slider performance.
Solution Approach 2:
The patent converts the harmful effect of high peak pressure and lubricant accumulation into a beneficial feature by designing the recessed region to actively trap lubricant. Instead of allowing lubricant to accumulate on the ABS and interfere with magnetic interfacing, the recessed area captures and contains the lubricant, preventing it from reaching critical areas and improving magnetic signal quality.
2Ease of manufacture
If the slider uses a conventional flat surface design, then it is simple to manufacture, but lubricant accumulates on the slider surface interfering with fly-height and magnetic interfacing
Solution Approach 1:
The recessed region introduces a localized topographic feature that changes lubricant flow and accumulation patterns. This local modification to the slider surface creates a trap area that captures lubricant before it can reach the ABS, effectively eliminating the harmful lubricant pickup effect while maintaining overall slider manufacturability through standard semiconductor fabrication techniques.
3Stability of the object's composition
If the slider increases stiffness to improve stability, then fly-height control improves, but the complexity of the slider structure increases
Solution Approach 1:
The recessed region acts as a structural feature that enhances slider stiffness through its geometry. The recessed walls provide additional structural support and rigidity to the slider body, improving stability and fly-height control without requiring additional components or complex mechanisms. The feature is integrated into the existing slider structure during fabrication.
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 design effectively reduces lubricant pickup, lowers peak pressure, and enhances stiffness, leading to improved fly-height control and magnetic interfacing efficiency in disk drive data storage devices.
Implementation Method 1
The slider includes an air bearing surface (ABS) designed to generate an air bearing force that counteracts a preload bias urging the slider toward the disk. The slider flies above and out of contact with the disk as a result of the ABS.
Implementation Method 2
The body defines a cavity within the preface area and sharing a common boundary with the ABS, wherein the cavity includes a second surface recessed further relative to the ABS than the first surface
Data Source
AI summary
A slider for use with disk drive data storage devices includes a topography that defines features of the slider. The features facilitate in controlling peak pressure, providing stiffness, and/or inhibiting lubricant accumulation on the slider. For example, the features include an air bearing surface and a cavity disposed in front of the air bearing surface. The cavity is closed on all sides by sidewalls.