Magnetic Recording Medium Dimensional Stability
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Solution Overview
Problem
Tape-type magnetic recording media with narrower track widths are prone to off-track issues due to environmental temperature and humidity changes, which affect their stability and recording accuracy.
Innovation Solution
A tape-type magnetic recording medium with a substrate and magnetic layer designed to maintain a specific width variation under different environmental conditions, combined with a cartridge memory for adjusting tension, ensuring stable recording and reproduction by maintaining a squareness ratio of 65% or more and a thickness ratio of 4.0≤TB/(TA−TB), where TA is the average thickness of the magnetic recording medium and TB is the substrate thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the recording track width is narrowed to increase capacity, then the storage capacity is improved, but the off-track error increases due to environmental changes
Solution Approach 1:
The patent applies parameter changes by controlling the thickness ratio between substrate and magnetic layer (TB/(TA-TB) ≥ 4.0) and maintaining high vertical magnetic anisotropy (squareness ratio ≥ 65%). These parameter optimizations make the magnetic recording medium less sensitive to environmental temperature and humidity changes, thereby reducing off-track errors while maintaining narrow track widths for high capacity
Solution Approach 2:
The patent uses composite material structure with a substrate and a magnetic layer having specific thickness relationship (TB/(TA-TB) ≥ 4.0). The magnetic layer contains magnetically-oriented particles with vertical anisotropy, creating a composite structure that provides both high storage capacity and stability against environmental variations, preventing off-track errors
2Manufacturing precision
If environmental temperature and humidity are controlled to maintain tape width, then off-track error is reduced, but device complexity increases
Solution Approach 1:
The patent applies self-service principle by designing the magnetic recording medium to inherently resist environmental effects through its structural parameters. The medium automatically maintains dimensional stability through its optimized thickness ratio and magnetic layer properties, eliminating the need for external environmental control systems
Solution Approach 2:
The patent changes the physical parameters of the recording medium itself (thickness ratio TB/(TA-TB) ≥ 4.0, squareness ratio ≥ 65%) to make it intrinsically stable against environmental variations. This approach replaces complex environmental control systems with material property optimization
Data Source
AI summary
A magnetic recording medium is provided and includes a substrate; and a magnetic layer provided over the substrate, wherein (wmax−wmin)/wmin≤400 [ppm] . . . (1) where wmax and wmin are respectively maximum and minimum of average values of width corresponding to samples of magnetic recording medium measured after the samples are stored for two hours under storage conditions (a loading tension in the longitudinal direction of the magnetic recording medium, a temperature and a relative humidity) for each of the samples, and a width of a sample of the magnetic recording medium at 25° C. and 50% relative humidity and without loading is ½ inch, magnetic recording medium has Young's modulus of less than 8.0 GPa in a longitudinal direction, and 4.0≤TB/(TA−TB) . . . (2) where TA is average thickness of magnetic recording medium and TB is average thickness of substrate.