Inductive Recording Element Pole Width Equalization
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Solution Overview
Problem
Magnetic recording media face challenges in maintaining high recording density while minimizing bit error rates due to off-track issues, where the reproducing element shifts from the center of the recording track, leading to poor off-track margin characteristics.
Innovation Solution
A magnetic recording and reproducing device is designed with an inductive recording element having magnetic poles with equal tip widths, a reproducing element width of 0.5 μm to 0.8 μm, and a magnetic medium with specific ferromagnetic powders and recesses to enhance off-track margin characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If recording density is increased to achieve higher capacity, then recording capacity is improved, but bit error rate increases due to off-track shifting of the reproducing element
Solution Approach 1:
The patent applies parameter changes by precisely controlling the reproducing element width (0.5-0.8 μm) and the tip widths of the first and second magnetic poles to be substantially equal. This parameter optimization allows the reproducing element to maintain proper alignment with the recording track center even at high recording densities, thereby improving off-track margin characteristics and reducing bit error rates while preserving high recording capacity
Solution Approach 2:
The patent utilizes asymmetric positioning of the reproducing element relative to the recording element. The reproducing element is positioned offset from the center of the recording element, with the first magnetic pole tip width substantially equal to the second magnetic pole tip width, creating an asymmetric configuration that optimizes the off-track margin and maintains reliable data reproduction at high recording densities
2Measurement precision
If reproducing element width is reduced to improve resolution, then measurement precision is improved, but off-track margin characteristics deteriorate
Solution Approach 1:
The patent optimizes the reproducing element width parameter to a specific range (0.5-0.8 μm) that balances resolution and off-track margin. Additionally, the first and second magnetic pole tip widths are set to be substantially equal, which compensates for the reduced width and maintains proper track alignment, thereby achieving both high reproduction resolution and favorable off-track margin characteristics
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 solution effectively reduces bit error rates and improves data reproduction quality by maintaining the reproducing element's alignment with the recording track, thereby enhancing the off-track margin characteristics.
Implementation Method 1
a recording element, wherein the recording element is an inductive recording element having a first magnetic pole which generates a magnetic field
Implementation Method 2
Data reproduction is performed by magnetically reading the data, which are recorded as described above, using a reproducing element
Implementation Method 3
the magnetic recording medium has a non-magnetic support, and a magnetic layer containing a ferromagnetic powder
Data Source
AI summary
The magnetic recording and reproducing device includes a magnetic recording medium, a recording element, and a reproducing element. The recording element is an inductive recording element having a first magnetic pole which generates a magnetic field, and a second magnetic pole which is spaced apart from the first magnetic pole with a write gap interposed therebetween, a tip width of the first magnetic pole is substantially the same as a tip width of the second magnetic pole, and a reproducing element width of the reproducing element is 0.5 μm to 0.8 μm. The magnetic recording medium has a non-magnetic support, and a magnetic layer containing a ferromagnetic powder, and the number of recesses, which are present in a surface of the magnetic layer and have an equivalent circle diameter of 0.20 μm to 0.50 μm, is 10 to 500 per area of 40 μm×40 μm.