Wafer-Level Head Span Shift for Magnetic Tape Head Alignment
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Solution Overview
Problem
Current magnetic tape head technologies face challenges in precisely adjusting the head span during fabrication to align read and write elements symmetrically, with limitations in step sizes and resolution, leading to suboptimal head span alignment and increased error rates.
Innovation Solution
The magnetic tape head is designed with elements that are symmetrically shifted during fabrication to achieve a desired head span, allowing for adjustments in multiples of a minimum step size, ensuring that the median head span of each module type matches closely, while maintaining the same pitch between elements and incorporating servo elements within 50 nm of the ideal separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional fabrication methods are used to adjust head span, then manufacturing process is simple, but alignment precision is insufficient leading to suboptimal head span alignment
Solution Approach 1:
The patent applies preliminary action by pre-defining multiple discrete head span configurations during the fabrication process. Instead of attempting continuous adjustment, the method pre-establishes specific head span values (e.g., 7.62mm, 7.64mm, 7.66mm) that can be selected based on measured deviations, thereby achieving high precision alignment without requiring complex real-time adjustment mechanisms.
Solution Approach 2:
The patent implements parameter changes by systematically varying the head span dimension across different configuration options. By providing a set of discrete head span values that differ by specific increments (e.g., 20 micrometers), the method enables precise compensation for fabrication variations through parameter selection rather than structural complexity.
2Manufacturing precision
If head span adjustment is limited to fixed step sizes, then fabrication is easier, but alignment resolution is insufficient leading to increased error rates
Solution Approach 1:
The patent applies segmentation by dividing the continuous head span adjustment range into discrete, manageable segments or steps. Each segment represents a specific head span configuration (e.g., 7.62mm, 7.64mm, 7.66mm) that can be independently fabricated and selected, thereby achieving fine resolution alignment while maintaining fabrication simplicity through standardized discrete steps.
Solution Approach 2:
The patent implements parameter changes by providing a systematic set of discrete head span values with controlled increments. This approach allows the manufacturing process to switch between different parameter values (head span lengths) to achieve optimal alignment, balancing fabrication ease with alignment resolution through parameter variation rather than process complexity.
3Manufacturing precision
If read and write elements are not symmetrically aligned, then fabrication is simpler, but data track positioning accuracy decreases leading to higher error rates
Solution Approach 1:
The patent applies asymmetry in a controlled manner by intentionally creating asymmetric head span configurations to compensate for systematic fabrication deviations. By providing different head span values for different module types (read vs. write) based on their specific alignment requirements, the method achieves symmetric element positioning through asymmetric parameter selection, thereby improving positioning accuracy without requiring complex mechanical alignment mechanisms.
Data Source
AI summary
Provided are a magnetic tape head, a magnetic tape drive, and a computational device in which the magnetic tape head is comprised of a plurality of modules comprising reader modules and writer modules, and a plurality of elements, wherein a total of shifts of selected elements of the plurality of elements that are shifted add up to a desired total shift to realign the plurality of modules, such that a median head span of each module type matches as close as possible to a desired value of a head span for all module types including the reader modules and the writer modules and wherein the head span is shifted at a wafer level.