Narrow Stripe Servo Pattern Azimuth Optimization
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Solution Overview
Problem
Existing servo pattern designs for magnetic storage media fail to provide precise positioning of magnetic read/write heads due to inadequate accuracy in position error signal (PES) generation, particularly with narrow stripe widths and varying azimuth angles, leading to suboptimal head positioning over data tracks.
Innovation Solution
A servo pattern with stripe widths narrower than 1.7 μm and oriented at an absolute azimuth angle of 6 degrees or larger, optimized to reduce the standard deviation of the position error signal (PES) by determining an optimal reader width, resulting in improved PES quality and head positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If servo pattern stripes are made narrower to increase positioning precision, then head positioning accuracy improves, but signal detection reliability deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the azimuth angle of the servo pattern stripes to be 6 degrees or more in absolute value. This angular parameter modification enhances the position error signal generation while maintaining reliable detection despite the narrow stripe width of less than 1.7 μm, thus resolving the contradiction between positioning precision and detection reliability.
2Measurement precision
If stripe width is reduced below 1.7 μm to improve positioning resolution, then measurement precision improves, but signal quality deteriorates
Solution Approach 1:
The patent changes the azimuth angle parameter to 6 degrees or more in absolute value, which compensates for the reduced stripe width. This parameter modification ensures that narrow stripes (less than 1.7 μm) still generate sufficient signal quality for accurate position error signal generation, thereby resolving the contradiction between measurement precision and signal quality.
3Measurement precision
If azimuth angle is increased to improve PES generation, then positioning accuracy improves, but manufacturing complexity increases
Solution Approach 1:
The patent specifies a minimum azimuth angle of 6 degrees in absolute value, which is sufficient to improve PES generation without requiring excessively complex manufacturing processes. This optimized parameter balance achieves high positioning accuracy while maintaining practical manufacturability of the servo pattern.
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 significantly reduces the standard deviation of the position error signal, enhancing the accuracy and quality of head positioning over magnetic tape, thereby improving data recording and reading precision.
Implementation Method 1
a head to detect the servo pattern of the substrate
Data Source
AI summary
A servo pattern, including stripes arranged in servo bursts for use in position error signal (PES) generation, is provided in which a stripe width is narrower than 1.7 μm and in which the stripes are oriented at an azimuth angle which in absolute value is equal to or larger than 6 degrees.