Magnetic Recording Medium Underlayer Binder Distribution Control
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Solution Overview
Problem
The uneven distribution of the binder in the underlayer of magnetic recording tapes affects the reliability, leading to increased defects during recording processing.
Innovation Solution
A magnetic recording medium with a controlled chlorine-containing binder distribution in the underlayer, where a specific threshold for chlorine count is maintained, and the uneven distribution range is limited to improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating material for forming an underlayer is applied onto a base layer to form an underlayer, then the magnetic recording medium can be manufactured, but the binder in the underlayer becomes unevenly distributed, leading to increased defects during recording processing
Solution Approach 1:
The patent applies local quality by creating a specific chlorine concentration profile within the underlayer. The chlorine count is controlled to be a specific value or more within a defined range from the interface between the underlayer and base layer, while being lower than this value in other regions. This non-uniform local distribution of chlorine (from the binder) resolves the contradiction by ensuring proper binder adhesion and distribution characteristics locally where needed, thereby improving reliability without requiring complete uniformity throughout the entire underlayer.
2Reliability
If the binder distribution in the underlayer is controlled to improve reliability, then defects during recording processing are reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent employs parameter changes by specifying quantitative thresholds for chlorine count distribution in the underlayer. The chlorine count is controlled to be a specific value or more within a defined distance range from the underlayer-base layer interface, and lower than this value in other regions. These parameter specifications provide clear manufacturing targets that simplify process control compared to attempting to achieve complete uniformity, thereby improving reliability while managing manufacturing complexity through measurable parameters.
Data Source
AI summary
A main object of the present technology is to improve the reliability of a magnetic recording tape by controlling the distribution of the binder in the underlayer.The present technology provides a magnetic recording medium including a magnetic layer, an underlayer, and a base layer in this order, the underlayer containing a chlorine-containing binder, the underlayer including a part having a thickness of 130 nm or less, the part having a chlorine count equal to or more than a threshold described below:[Threshold]=[an average chlorine count in the underlayer]+6×[a standard deviation determined in calculation of the average chlorine count].Furthermore, the present technology also provides a magnetic recording medium including a magnetic layer, an underlayer, and a base layer in this order, the underlayer containing a chlorine-containing binder, the underlayer including a part having a thickness of 12% or less of a thickness of the underlayer, the part having a chlorine count equal to or more than the above-described threshold.