Rotational Disk Lubricant Dipping for Uniform Coating Thickness
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Solution Overview
Problem
The existing methods for applying lubricant to hard disk drive media result in uneven thickness distribution, leading to increased risk of fly stiction failures due to variable lubricant adhesion and smearing, especially with magnetic heads that create negative pressure, causing lubricant to be deposited on the head.
Innovation Solution
A rotational dipping process using a lubricant station with a caddy that rotates the disk media 180 degrees within the lubricant bath to ensure equal dwell time for all parts, ensuring a uniform lubricant layer by maintaining consistent immersion times across the disk surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If vertical dipping is used to apply lubricant to disk media, then the process is simple and efficient, but the lubricant thickness becomes uneven across the disk surface
Solution Approach 1:
The patent applies rotational motion to the disk media during the lubricant application process. The disk is rotated while being dipped into the lubricant bath, transforming a static vertical dipping process into a dynamic rotational process. This dynamic approach ensures that all surfaces of the disk receive equal exposure to the lubricant, achieving uniform thickness distribution while maintaining process efficiency.
2Ease of operation
If magnetic heads create negative pressure during operation, then data reading and writing functions are achieved, but lubricant is deposited on the head causing fly stiction failures
Solution Approach 1:
The patent creates a uniformly distributed lubricant layer across the entire disk surface through rotational dipping. This uniform distribution ensures that the lubricant properties are consistent at all locations, including the area where the magnetic head flies. The controlled uniformity prevents excessive lubricant accumulation that could be deposited on the head, thereby reducing fly stiction failures while maintaining the necessary lubrication for head operation.
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 approach ensures a more uniform lubricant distribution, reducing the likelihood of read/write failures by minimizing high points of lubricant contact and maintaining adhesion, thus enhancing the durability and reliability of the disk media.
Implementation Method 1
lubricant is applied to the disk media during manufacturing
Implementation Method 2
portions (e.g., bottom of disk) that are immersed longer having more lubricant bonded due to the longer dwell time
Data Source
AI summary
Devices and methods are disclosed for a lubricant station for applying lubricant to storage disk platters. The lubricant station includes a tub for holding lubricant and a caddy disposed in the tub, with the storage disk platters placed in the caddy. The caddy includes a mandrel configured to raise and lower the storage disk platters into the tub. The caddy also includes rotatable shafts configured to hold the storage disk platter. The caddy also includes a drive mechanism for rotating the rotatable shafts. The lubricant station also includes control circuitry configured to lower the storage disk platters onto the rotatable shafts of the caddy, rotate the rotatable shafts and the storage disk platters, and remove the storage disk platters from the tub.