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 0.2 μm to 0.5 μm, and a magnetic layer with specific recess and bright region distributions to enhance off-track margin characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If recording density is increased, 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 (0.2-0.5 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 positioning within the recording track 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 asymmetry in the magnetic pole configuration where the first magnetic pole generates the magnetic field and the second magnetic pole is spaced apart with a write gap, with both poles having substantially equal tip widths. This asymmetric yet balanced pole structure creates an optimized magnetic field distribution that enhances tracking stability and reduces off-track shifting, enabling reliable high-density reproduction
2Measurement precision
If reproducing element width is decreased to improve resolution, then off-track margin is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines a specific parameter range for the reproducing element width (0.2-0.5 μm) that balances resolution requirements with manufacturing feasibility. This parameter specification enables manufacturers to achieve the desired off-track margin characteristics and reproduction quality without requiring extremely tight tolerances that would be difficult to manufacture, thus resolving the contradiction between precision measurement and manufacturing precision
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 within the recording track, thereby enhancing the off-track margin characteristics and recording density.
Implementation Method 1
a recording element which 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
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 0.2 μm or greater and less than 0.5 μm. In the magnetic recording medium, the number of recesses, which are present in a surface of the magnetic layer and have an equivalent circle diameter of 0.10 μm or greater and less than 0.20 μm, is 100 to 2,000 per area of 40 μm×40 μm.