Magnetic Recording Medium Dimensional Stability
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Solution Overview
Problem
Magnetic recording media face challenges in maintaining dimensional stability and recording density due to temperature and humidity changes, which can lead to off-track phenomena and reduced recording capacity.
Innovation Solution
A magnetic recording medium with a tape-like shape and specific thickness, featuring a substrate and a magnetic layer, optimized temperature and humidity expansion coefficients, and a moisture content range to minimize deformation and maintain positional accuracy between the medium and the magnetic head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the magnetic recording medium is made thinner to increase recording density, then the recording capacity is improved, but the dimensional stability deteriorates due to temperature and humidity changes
Solution Approach 1:
The patent applies parameter changes by precisely controlling the temperature expansion coefficient within 6.0-8.0 ppm/°C and moisture absorption characteristics to 0.05-0.15% at 90% RH. These parameter optimizations enable the thin magnetic recording medium (5.3 μm or less) to maintain dimensional stability while achieving high recording density, resolving the contradiction between thinning and stability.
2Manufacturing precision
If the temperature expansion coefficient is increased to compensate for humidity-induced deformation, then the positional accuracy is improved, but the deformation under temperature changes worsens
Solution Approach 1:
The patent optimizes the temperature expansion coefficient to a specific range (6.0-8.0 ppm/°C) that balances compensation for humidity-induced deformation while preventing excessive deformation under temperature changes. This precise parameter control maintains positional accuracy between the magnetic head and medium without causing instability.
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 solution effectively reduces deformation variations, enhances recording density, and increases the recordable capacity of magnetic recording cartridges by maintaining a stable positional relationship between the medium and the head across varying environmental conditions.
Implementation Method 1
a temperature expansion coefficient of the magnetic recording medium is 6.0 ppm/° C. or more and 8.0 ppm/° C. or less
Data Source
AI summary
There is provided a magnetic recording medium of which a dimensional change due to a change in a temperature/humidity environment is small. The magnetic recording medium is a magnetic recording medium having a tape-like shape and having an average thickness of 5.3 μm or less. The magnetic recording medium includes a substrate and a magnetic layer provided on the substrate. An environmental relative humidity, in which a temperature expansion coefficient of the magnetic recording medium is 6.0 ppm/° C. or more and 8.0 ppm/° C. or less, ranges between 10% RH and 80% RH.