Hanger Device Liquid-Cutting Plate Uniform Lubricant Membrane
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Solution Overview
Problem
The existing methods for forming a lubricant membrane on magnetic recording media using the dipping method often result in irregularities in the thickness distribution due to disturbances in the liquid lubricant surface, particularly when the hanger is raised from the immersion tank, leading to non-uniform lubricant application.
Innovation Solution
A device with a hanger system that includes support plates and liquid-cutting plates, which are designed to minimize the disturbance of the liquid surface by creating a space along the inner circumference of the magnetic recording medium, preventing the accumulation and splashing of liquid, thus ensuring a uniform thickness of the lubricant membrane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the magnetic recording medium is raised from the immersion tank using a conventional hanger, then the lubricant membrane is formed on the surface, but the liquid surface of the liquid lubricant is shaken causing line-shaped application irregularities in the thickness distribution
Solution Approach 1:
A liquid-cutting plate is introduced as an intermediary element between the hanger and the liquid lubricant surface. This plate cuts through the liquid surface cleanly during the raising process, preventing liquid accumulation and shaking that would otherwise occur at the meniscus region, thereby eliminating line-shaped application irregularities
Solution Approach 2:
The hanger structure is segmented into multiple functional components: the support structure for holding the magnetic recording medium, the liquid-cutting plate for clean surface separation, and the spacing structure for maintaining proper clearance. This segmentation allows each component to perform its specific function optimally without interfering with others
2Productivity
If batch processing is used to immerse multiple magnetic recording media into the immersion tank, then productivity is improved, but collective processing causes liquid surface disturbances when raising
Solution Approach 1:
The liquid-cutting plate serves as a mediator that enables batch processing without compromising precision. By cleanly cutting the liquid surface for each medium being raised, it prevents the cumulative liquid disturbances that would occur when multiple media are processed collectively, thus maintaining uniform lubricant membrane thickness even during batch operations
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 solution effectively suppresses the shaking of the liquid surface during the raising process, allowing for the formation of a lubricant membrane with a uniform thickness, enhancing the abrasion resistance and environmental resistance of the magnetic recording medium while preventing line-shaped application irregularities.
Implementation Method 1
a lubricant membrane with a uniform thickness is formed on the surface of the magnetic recording medium by immersing the magnetic recording medium into an immersion tank that has a liquid lubricant and then raising the magnetic recording medium from the immersion tank
Implementation Method 2
the thickness of a lubricant membrane formed on the surface of a magnetic recording medium is precisely managed within a unit of sub-nm
Data Source
AI summary
The present invention provides a device and a method for producing a magnetic recording medium having a lubricant membrane with a uniform thickness on a surface. The device for producing the magnetic recording medium includes: a hanger device that is inserted into the central hole of the magnetic recording medium and supports the magnetic recording medium in a hanging state; and a raising and lowering device that raises and lowers one of the hanging device and an immersion tank with respect to the other thereof. The hanger device includes a support plate of which an upper end comes into contact with an inner circumference of the magnetic recording medium and a liquid-cutting plate which extends from a lower end of the support plate and is distant by a space along the inner circumference of the magnetic recording medium from the inner circumference of the magnetic recording medium.