Magnetic Recording Substrate Oxidation Control
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Solution Overview
Problem
Magnetic recording media substrates face challenges with dimensional stability under changing temperature and humidity conditions, leading to track deviations and high error rates due to the limitations of existing substrates, such as biaxially oriented polyester films and metal or oxide reinforcing layers.
Innovation Solution
A magnetic recording medium substrate with a polyester film having metallic oxide-containing layers on both surfaces, with controlled thickness, light transmittance, and surface resistivity, formed using a vacuum evaporation method to enhance dimensional stability and prevent cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a metal reinforcing layer is formed on the polyester film, then dimensional stability is improved, but light transmission is blocked and film thickness control becomes difficult
Solution Approach 1:
The patent changes the oxidation degree parameter of the metal layer to control its properties. By controlling the oxidation degree to be within a specific range (0.5-2.0), the layer achieves appropriate light transmission while maintaining dimensional stability. This parameter control allows the metal layer to be transparent enough for thickness measurement while still providing the necessary reinforcement.
Solution Approach 2:
The patent creates a composite structure consisting of the polyester film base layer and the oxidized metal reinforcing layer. This composite material combines the strength and dimensional stability of the metal with the light transmission properties needed for coating control, achieving both reinforcement and processability requirements.
2Stability of the object's composition
If a metal oxide reinforcing layer is formed on the polyester film, then dimensional stability is improved, but the layer becomes hard and fragile and cracks under tension or curving
Solution Approach 1:
The patent controls the oxidation degree parameter to prevent excessive oxidation that would make the metal layer too brittle. By maintaining oxidation degree within 0.5-2.0, the layer retains sufficient ductility to withstand tension and curving without cracking, while still providing dimensional stability improvement.
3Stability of the object's composition
If a metal oxide reinforcing layer is formed on the polyester film, then dimensional stability is improved, but the oxide is hygroscopic and causes expansion under changing humidity conditions
Solution Approach 1:
The patent controls the oxidation degree parameter to regulate the hygroscopic properties of the metal oxide layer. By maintaining oxidation degree within the optimal range of 0.5-2.0, the layer's hygroscopicity is controlled to minimize expansion under changing humidity conditions, while still providing sufficient dimensional stability improvement.
4Productivity
If the recording track is made smaller for higher density recording, then recording capacity is increased, but the track becomes liable to deviation due to heat deformation and temperature-humidity changes
Solution Approach 1:
The patent controls the oxidation degree parameter of the reinforcing layer to optimize its dimensional stability properties. This parameter control enables the substrate to maintain stable dimensions under temperature and humidity changes, preventing track deviation even when recording tracks are made smaller for higher density.
Solution Approach 2:
The patent uses a composite structure of polyester film and oxidized metal layer to create a substrate with enhanced dimensional stability. This composite material provides the necessary stability to maintain track position during high-density recording operations despite environmental variations.
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
The substrate provides improved dimensional stability, reduced error rates, and enhanced durability by controlling the oxidation degree of the metallic oxide layers, ensuring the substrate remains dimensionally consistent and resistant to environmental changes.
Implementation Method 1
formed using a vacuum evaporation method
Implementation Method 2
controlled thickness, light transmittance
Implementation Method 3
surface resistivity
Data Source
AI summary
A magnetic recording medium substrate has a polyester film having metallic oxide-containing layers (layers M) formed on both the surfaces, one layer on each surface, the layers M having a thickness of 50 to 200 nm each, characterized in that the magnetic recording medium substrate has a total light transmittance of 0 to 75% and a surface resistivity of 1×102 to 1×1013Ω on each surface.