Dual Azimuthal Slope Servo Write Heads for Tape Positioning

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Solution Overview

Problem

Current servo write technologies for magnetic storage media face challenges in efficiently encoding servo patterns with varying azimuthal slopes, which affects the accuracy of head positioning and longitudinal position information in magnetic tape drives.

Innovation Solution

A system comprising two servo write heads with distinct azimuthal slopes, where each head encodes dibits by generating magnetic flux through coils and gaps in a housing, allowing for sequential energization and de-energization to encode servo patterns on a magnetic tape with varying azimuthal slopes, enabling precise encoding of servo patterns.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single servo write head is used to encode servo patterns, then the device complexity is reduced, but the manufacturing precision of encoding servo patterns with varying azimuthal slopes deteriorates

Engineering Contradiction:

Improvenumber of servo write headsVSAvoidencoding precision of servo patterns

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The single servo write head is segmented into two separate servo write heads, each dedicated to encoding dibits with specific azimuthal slopes. This segmentation allows each head to be optimized for its specific encoding task, thereby improving the manufacturing precision of servo patterns while maintaining manageable device complexity through modular design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each servo write head is designed with local quality specialization - the first servo write head is optimized for encoding dibits with a first azimuthal slope, while the second servo write head is optimized for dibits with a second azimuthal slope. This local optimization ensures high encoding precision for each specific pattern type without requiring the entire system to be overly complex.

Inventive Principle:

Principle #3Local quality

2Manufacturing precision

If multiple servo write heads with different azimuthal slopes are used, then the manufacturing precision of encoding servo patterns is improved, but the device complexity increases

Engineering Contradiction:

Improveencoding precision of servo patternsVSAvoidnumber of servo write heads

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The encoding function is segmented into separate dedicated heads for different azimuthal slopes. This segmentation improves manufacturing precision by allowing each head to be optimized for its specific encoding task, while the overall device complexity is managed through a modular architecture where each head operates independently with well-defined functions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The servo write apparatus is designed with multi-functionality to handle different encoding tasks. The system can selectively activate the first or second servo write head depending on the required dibit pattern, allowing a single apparatus to perform multiple encoding functions without requiring a completely separate system for each function.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If sequential energization and de-energization of servo write heads is used, then the reliability of servo pattern encoding is improved, but the duration of action increases

Engineering Contradiction:

Improvereliability of servo pattern encodingVSAvoidencoding time

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The encoding process uses periodic action through sequential energization and de-energization of the servo write heads. Each head is energized in a controlled sequence to encode dibits with specific azimuthal slopes, then de-energized before the next encoding cycle. This periodic operation improves reliability by ensuring complete encoding of each pattern type while the duration is managed through optimized timing sequences.

Inventive Principle:

Principle #19Periodic action

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

This solution enhances the encoding of servo patterns, improving head positioning accuracy and longitudinal position information, thereby enhancing the overall performance and reliability of magnetic tape drives.

Implementation Method 1

each servo write head comprises a coil to which current is applied to generate a magnetic flux

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

a magnetic flux generated by a servo write head is directed outwardly through the associated gap to encode a magnetic transition

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Data Source

PatentUS8711512B2Servo write assembly

Publication Date: 2014.04.29 INTERNATIONAL BUSINESS MACHINE CORPORATION

AI summary

A servo write apparatus, comprising a first servo write head configured to only encode a single first magnetic dibit onto a magnetic information storage medium, wherein the first magnetic dibit comprises a first azimuthal slope. The servo write apparatus further comprises a second servo write head configured to encode one or more second magnetic dibits onto a magnetic information storage medium, wherein the second magnetic dibit comprises a second azimuthal slope, wherein the first azimuthal slope differs from the second azimuthal slope.