Thin Magnetic Recording Medium Dimensional Stability
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Solution Overview
Problem
Magnetic recording media with reduced thickness face challenges in maintaining dimensional stability under high-humidity conditions due to temperature changes.
Innovation Solution
A magnetic recording medium with an average thickness of tT≤5.3 μm, a creep slope ratio of 1.440 or less, and a Tan δ ratio of less than 1.2100, along with a magnetic recording cartridge design that includes a memory and a case to accommodate the medium, ensuring stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the thickness of the magnetic recording medium is reduced to increase cartridge capacity, then the cartridge capacity is improved, but the dimensional stability against temperature change in high-humidity environment deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness of the magnetic recording medium to 5.3 μm or less, and by optimizing the ratio of creep slope at high humidity to creep slope at low humidity to be 1.440 or less. Additionally, the loss tangent ratio at high humidity to loss tangent at low humidity is controlled to be less than 1.2100. These parameter optimizations enable the thin medium to maintain dimensional stability under temperature changes in high-humidity environments while achieving increased cartridge capacity.
Solution Approach 2:
The patent employs composite materials by constructing the magnetic recording medium with multiple functional layers including a substrate layer, magnetic layer, and protective layers. This multi-layer composite structure allows the thin medium (tT≤5.3 μm) to maintain mechanical strength and dimensional stability despite the reduced overall thickness, thereby resolving the contradiction between thinness for capacity and stability for performance.
2Volume of stationary object
If the thickness of the magnetic recording medium is reduced, then the cartridge capacity is increased, but the creep resistance under humidity conditions deteriorates
Solution Approach 1:
The patent optimizes the creep resistance by controlling the ratio of average creep slope at 32°C and 80% RH to average creep slope at 32°C and 20% RH to be 1.440 or less. This parameter optimization ensures that the thin magnetic recording medium (tT≤5.3 μm) maintains sufficient creep resistance under high-humidity conditions, preventing degradation of reliability while achieving increased cartridge capacity.
Solution Approach 2:
The multi-layer composite structure of the magnetic recording medium, including the substrate layer and magnetic layer with specific thickness ratios, provides enhanced creep resistance. The composite construction distributes mechanical stresses across layers, preventing excessive deformation under humidity-induced thermal expansion, thereby maintaining reliability in thin-media high-capacity cartridges.
3Volume of stationary object
If the thickness of the magnetic recording medium is reduced, then the cartridge capacity is increased, but the dimensional stability under temperature change in high-humidity environment deteriorates
Solution Approach 1:
The patent achieves improved manufacturing precision by controlling the loss tangent ratio (Tan δ2/Tan δ1) at temperature of 32°C and humidity transition from 20% RH to 80% RH to be less than 1.2100. This parameter control ensures that the thin magnetic recording medium maintains consistent dimensional properties during manufacturing and operation, enabling high-precision manufacturing of thin-media cartridges with increased capacity.
Data Source
AI summary
Provided are a magnetic recording medium and a magnetic recording cartridge. An average thickness of the magnetic recording medium tT is tT≤5.3 μm, a ratio (A2/A1) of an average creep slope A2 at a temperature of 32° C. and a humidity of 80% RH to an average creep slope A1 at a temperature of 32° C. and a humidity of 20% RH is 1.440 or less, and a ratio (Tan δ2/Tan δ1) of an average Tan δ2 at a temperature of 32° C. and a humidity of 80% RH to an average Tan δ1 at a temperature of 32° C. and a humidity of 20% RH is less than 1.2100. The magnetic recording cartridge includes the magnetic recording medium, a memory and a case that accommodates the magnetic recording medium and the memory.