Magnetic Tape Servo Head Deviation Measurement
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Solution Overview
Problem
Existing signal processing devices for magnetic tape systems struggle to accurately specify the deviation amount between servo patterns in adjacent servo bands, which affects the tracking control and off-track suppression in magnetic tape drives.
Innovation Solution
A signal processing device that acquires data from a magnetic tape with servo bands, using a pair of servo reading elements to read servo patterns in adjacent bands and calculate the deviation amount in time between the signals from these patterns, allowing for precise adjustment of the magnetic head's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single servo reading element is used to read servo patterns, then the device structure is simple, but the ability to accurately measure deviation between adjacent servo bands is insufficient
Solution Approach 1:
The patent divides the servo reading function into multiple independent servo reading elements (first servo reading element and second servo reading element), each responsible for reading servo patterns in different servo bands. This segmentation enables parallel reading from multiple bands, allowing accurate calculation of deviation amounts between adjacent bands while maintaining relatively simple individual element structures.
Solution Approach 2:
The patent combines multiple servo reading elements into a single magnetic head assembly, integrating their outputs for joint processing. By merging the reading functions and combining the signals from different servo bands, the system achieves accurate deviation measurement without requiring separate independent devices, thus balancing measurement precision with device complexity.
2Measurement precision
If multiple servo reading elements are used to read servo patterns from adjacent bands, then the deviation amount can be accurately specified, but the device structure becomes more complex
Solution Approach 1:
Each servo reading element in the magnetic head is designed with universal functionality to read servo patterns from different servo bands. The elements can selectively read from first, second, or both servo bands depending on the operational mode, making the magnetic head structure versatile and adaptable without requiring entirely separate reading mechanisms for each band.
Solution Approach 2:
The patent uses multiple servo reading elements that essentially copy the same reading function across different spatial positions. Each element replicates the servo pattern reading capability, allowing parallel acquisition of servo signals from adjacent bands. This copying approach enables accurate deviation calculation while using standardized, relatively simple reading element designs.
3Manufacturing precision
If deviation amount calculation is performed using signals from multiple servo bands, then tracking control accuracy is improved, but the signal processing complexity increases
Solution Approach 1:
The patent implements feedback by calculating the deviation amount between servo patterns from adjacent bands and using this information to adjust tracking control. The signal processing system continuously monitors the deviation and provides corrective feedback to maintain accurate tracking, improving control precision while using a relatively straightforward feedback loop structure.
Solution Approach 2:
The system performs preliminary signal processing by acquiring and processing servo signals from multiple bands simultaneously to calculate deviation amounts before final tracking control decisions are made. This preliminary calculation of deviation provides advance information that simplifies subsequent control actions, reducing the complexity of real-time processing.
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 enables easy specification of the deviation amount between servo patterns, improving the accuracy of tracking control and reducing off-track occurrences in magnetic tape drives, thereby enhancing data recording and reading precision.
Implementation Method 1
a magnetic head that includes a pair of servo reading elements corresponding to a pair of servo bands adjacent to each other in the width direction among the plurality of servo bands
Implementation Method 2
acquires a first signal based on a first result obtained by reading the servo pattern in a first servo band included in the pair of servo bands by a first servo reading element included in the pair of servo reading elements
Data Source
AI summary
A magnetic head includes a pair of servo reading elements corresponding to a pair of servo bands adjacent to each other in a width direction. A processor acquires a first signal based on a first result obtained by reading a servo pattern in a first servo band by a first servo reading element included in a pair of servo reading elements, acquires a second signal based on a second result obtained by reading the servo pattern in a second servo band by a second servo reading element included in the pair of servo reading elements, and outputs a deviation amount signal corresponding to a deviation amount in time between the first signal and the second signal.