Magnetic Recording Medium Width Control via Tension
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Solution Overview
Problem
Magnetic recording media face challenges in maintaining constant width due to significant dimensional changes caused by environmental factors like temperature and humidity, making it difficult to achieve stable recording and reproducing characteristics.
Innovation Solution
A magnetic recording medium with a specific configuration, including an elongated substrate, a recording layer with ε-iron oxide particles, and a back layer, where the average thickness is ≤5.5 μm and the dimensional change in the width direction is ≥700 ppm/N with respect to tension change, allowing for reduced width changes by adjusting longitudinal tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the track width and distance between tracks are made narrow to improve data recording density, then the recording capacity is improved, but the maximum allowable dimensional change becomes smaller making stable recording difficult
Solution Approach 1:
The patent applies parameter changes by controlling the thickness of the magnetic recording medium to be 5.5 μm or less and adjusting the dimensional change amount in the width direction to be 700 ppm/N or more with respect to tension change. These parameter adjustments enable the medium to maintain dimensional stability while supporting high recording density
Solution Approach 2:
The patent employs composite materials through a multi-layer structure consisting of a substrate, a magnetic recording layer, and a back coating layer. This composite structure provides both mechanical strength and controlled dimensional properties, allowing the medium to withstand environmental variations while maintaining narrow track dimensions
2Reliability
If the dimensional change in width direction is reduced to maintain stable recording characteristics, then the recording stability is improved, but the ability to adjust width through tension becomes limited
Solution Approach 1:
The patent applies dynamics by enabling the magnetic recording medium to respond dynamically to tension changes in the longitudinal direction. The controlled dimensional change amount of 700 ppm/N or more allows the width to adjust in response to tension variations, providing adaptability while maintaining recording stability through the controlled response characteristic
3Manufacturing precision
If the thickness of the magnetic recording medium is reduced to control dimensional variation, then the width control is improved, but the mechanical strength may be compromised
Solution Approach 1:
The patent employs composite materials through a multi-layer structure consisting of a substrate, a magnetic recording layer, and a back coating layer. This composite structure provides both mechanical strength and controlled dimensional properties, allowing the medium to withstand environmental variations while maintaining narrow track dimensions
Solution Approach 2:
The patent applies flexible thin film technology by using a magnetic recording medium with thickness of 5.5 μm or less. The thin film structure achieves precise width control through tension adjustment while the layered composite design maintains sufficient mechanical strength for handling and 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
The solution effectively maintains the width of the magnetic recording medium constant or substantially constant despite environmental changes, enhancing recording and reproducing stability and capacity.
Implementation Method 1
the dimensional change amount Δw in the width direction with respect to the tension change in the longitudinal direction meets the requirement that 700 [ppm/N]≤Δw
Data Source
AI summary
The average thickness tT of a magnetic recording medium meets the requirement that tT≤5.5 [μm], and the dimensional change amount Δw in the width direction of the magnetic recording medium with respect to the tension change in the longitudinal direction of the magnetic recording medium meets the requirement that 700 ppm/N≤Δw.