Magnetic Recording Cartridge Base Layer for High-Temperature Width Stability
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Solution Overview
Problem
Magnetic recording cartridges face challenges in maintaining the width of magnetic recording media constant in high-temperature environments, leading to off-track phenomena due to variations in dimension, which are not effectively addressed by conventional methods that may increase tape thickness and reduce recording capacity.
Innovation Solution
A magnetic recording cartridge design with a base layer having a loss modulus of 0.40 GPa or less at 65°C, allowing for adjustment of running tension and winding direction to correct width variations, ensuring a variation in width of 0 ppm at specific portions after storage at 65°C for 360 hours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the track width and distance between adjacent tracks are made narrower to improve data recording density, then the data recording capacity is improved, but the magnetic recording medium becomes more sensitive to dimensional variations caused by environmental factors
Solution Approach 1:
The patent changes the physical parameters of the base layer by controlling the loss modulus to be 0.40 GPa or less at 65°C and storage modulus to be 8.0 GPa or less at 65°C. This parameter optimization allows the tape to maintain dimensional stability while supporting high recording density
Solution Approach 2:
The patent uses a composite structure consisting of a base layer with specific modulus properties and a magnetic layer. The base layer is designed to have lower modulus values at elevated temperatures, creating a composite structure that balances dimensional stability with high-temperature performance
2Reliability
If conventional methods are used to reduce dimensional variation, then the variation in dimension is reduced, but the tape thickness increases and recording capacity decreases
Solution Approach 1:
Instead of increasing tape thickness to reduce dimensional variation, the patent changes the modulus parameters of the base layer material. By achieving loss modulus ≤0.40 GPa and storage modulus ≤8.0 GPa at 65°C, the patent reduces dimensional variation while maintaining thin tape thickness and high recording capacity
3Temperature
If the magnetic recording medium is stored in high-temperature environment, then the storage capacity is improved, but the width of the magnetic recording medium varies and off-track phenomena occur
Solution Approach 1:
The patent optimizes the base layer modulus parameters specifically for high-temperature performance. The loss modulus of 0.40 GPa or less and storage modulus of 8.0 GPa or less at 65°C enable the tape to maintain width consistency even when stored in high-temperature environments, preventing off-track phenomena
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 design maintains the width of the magnetic recording medium constant, preventing off-track phenomena and enhancing recording capacity by allowing use in high-temperature environments without increasing tape thickness.
Implementation Method 1
a loss modulus at 65° C. of the base layer is 0.40 GPa or less
Data Source
AI summary
A magnetic recording cartridge is provided and includes a magnetic recording medium having a base layer; and a reel, in which a loss modulus at 65° C. of the base layer is 0.40 GPa or less, the magnetic recording medium is wound around the reel, and when a variation in width is measured over an entire length of the magnetic recording medium after storage at 65° C. for 360 hours, a sign of variation in width Δout on an outer side of winding is different from a sign of variation in width Δin on an inner side of winding, and the variation in width is 0 ppm at any position of two portions sandwiching a center line of the entire length of the magnetic recording medium in a case where the entire length of the magnetic recording medium is divided into four portions by dividing into four equal parts.