Magnetic Tape Surface Control for Head Tilt Tracking
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Solution Overview
Problem
Magnetic tapes experience deterioration in electromagnetic conversion characteristics when recording or reproducing data at different head tilt angles, leading to issues like overwriting and reproducing failure due to width deformation.
Innovation Solution
A magnetic tape with a non-magnetic support and a magnetic layer containing ferromagnetic powder, where fatty acid or fatty acid amide components are included on the magnetic layer side, and specific C—H derived C concentrations and AlFeSil abrasion values are maintained to minimize deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the magnetic head tilts at different angles to compensate for tape width deformation, then tracking accuracy is improved, but electromagnetic conversion characteristics deteriorate
Solution Approach 1:
The invention changes the surface properties of the magnetic layer by controlling the C-H derived C concentration (45-65 atom%) and AlFeSil abrasion value (20-50 μm at 45° tilt angle). These parameter changes in the magnetic layer surface characteristics allow the tape to maintain stable electromagnetic conversion characteristics even when the magnetic head tilts at different angles during operation.
Solution Approach 2:
The invention uses a composite magnetic layer structure containing ferromagnetic powder with specific surface properties. The combination of controlled C-H derived C concentration and AlFeSil abrasion value creates a composite surface that simultaneously provides good electromagnetic conversion characteristics and abrasion resistance, resolving the contradiction between tracking accuracy and electromagnetic performance.
2Duration of action of stationary object
If the magnetic layer surface is made smoother to reduce abrasion, then head wear is reduced, but electromagnetic conversion characteristics deteriorate
Solution Approach 1:
The invention optimizes the surface parameters of the magnetic layer by controlling the AlFeSil abrasion value to 20-50 μm at a 45° tilt angle and maintaining C-H derived C concentration at 45-65 atom%. This parameter optimization creates a surface that balances smoothness for reduced head wear with sufficient electromagnetic conversion characteristics.
Solution Approach 2:
The invention applies different surface properties to different aspects of the magnetic layer. The C-H derived C concentration control (45-65 atom%) provides electromagnetic conversion characteristics, while the AlFeSil abrasion value control (20-50 μm) provides surface smoothness and abrasion resistance. This local quality differentiation resolves the contradiction between head wear resistance and electromagnetic performance.
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 magnetic tape exhibits reduced deterioration in electromagnetic conversion characteristics when recording or reproducing data at different head tilt angles, thereby preventing overwriting and reproducing failures.
Implementation Method 1
a magnetic layer containing a ferromagnetic powder... electromagnetic conversion characteristics
Implementation Method 2
an AlFeSil abrasion value45° of the surface of the magnetic layer measured at a tilt angle of 45° of an AlFeSil prism
Implementation Method 3
C—H peak surface area ratio in C1s spectra obtained by X-ray photoelectron spectroscopy performed on a surface of the magnetic layer
Data Source
AI summary
A magnetic tape in which a C—H derived C concentration calculated from a C—H peak surface area ratio in C1s spectra obtained by XPS performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 atom % to 65 atom %, and in an environment with a temperature of 23° C. and a relative humidity of 50%, an AlFeSil abrasion value45° of the surface of the magnetic layer measured at a tilt angle of 45° of an AlFeSil prism is 20 μm to 50 μm, a standard deviation of an AlFeSil abrasion value of the surface of the magnetic layer measured at each of given tilt angles of the AlFeSil prism is 30 μm or less, and the tilt angle of the AlFeSil prism is an angle formed by a longitudinal direction of the AlFeSil prism and a width direction of the magnetic tape.