Magnetic Recording Medium Dimensional Stability for Off-Tracking Control
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Solution Overview
Problem
Magnetic recording media face challenges in maintaining narrow data track widths to enhance recording density while suppressing off-tracking, especially under varying environmental conditions such as temperature and humidity.
Innovation Solution
A tape-like magnetic recording medium with a base substrate and magnetic layer, where the data track width is maintained at 2900 nm or less, and the maximum and minimum widths under different environmental conditions satisfy the relational expression (wmax−wmin)/wmin≤400 [ppm], ensuring stable recording and reproducing characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the data track width is reduced to improve recording density, then the recording density is improved, but the off-tracking increases
Solution Approach 1:
The patent applies parameter changes by controlling the dimensional stability of the magnetic recording medium through specific material composition and structure. The base substrate and magnetic layer are designed to maintain width dimensions within 400 ppm variation across temperature and humidity conditions, enabling narrow track widths (2900 nm or less) to be maintained with acceptable off-tracking
Solution Approach 2:
The patent uses composite materials by combining a base substrate with a magnetic layer in a multi-layer structure. This composite construction allows the medium to achieve both the mechanical stability needed for dimensional control and the magnetic properties required for high-density recording, resolving the contradiction between narrow track width and off-tracking
2Quantity of substance
If the data track width is reduced to enhance recording density, then the recording density is improved, but the dimensional stability required to suppress off-tracking becomes more difficult to maintain
Solution Approach 1:
The patent controls the dimensional stability parameter by designing the base substrate and magnetic layer with specific material properties that limit width variation to 400 ppm or less under environmental changes. This parameter control enables the medium to support narrow track widths while maintaining sufficient dimensional stability
Solution Approach 2:
The patent applies local quality by differentiating the material properties of the base substrate and magnetic layer to serve different functions. The base substrate provides mechanical stability and dimensional control, while the magnetic layer enables high-density recording, allowing the system to achieve both narrow track width and dimensional stability
Data Source
AI summary
A magnetic recording medium is a magnetic recording medium having a tape-like shape and includes a base substrate and a magnetic layer provided on the base substrate. A plurality of data tracks can be formed in the magnetic layer, a width of a data track is 2900 nm or less, and in a case of defining, as wmax and wmin, a maximum value and a minimum value respectively out of average values of a width of the magnetic recording medium measured under four kinds of environment in which temperature and relative humidity are set to (10° C., 10%), (10° C., 80%), (29° C., 80%), and (45° C., 10%), wmax and wmin satisfy a relation of (wmax−wmin)/wmin≤400 [ppm].