Servo Control for Magnetic Tape Head Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As recording track widths narrow and recording densities increase on magnetic tapes, existing servo control methods face challenges in enabling magnetic heads to follow tracks accurately and quickly, especially at higher tape speeds, leading to increased off-track values and errors.
Innovation Solution
A servo controlling method that includes reading tape variance information and servo signals from a magnetic tape cartridge, calculating relative head positions, and controlling the magnetic head's position to correct off-track values, allowing for rapid and accurate tracking by moving the head unit in the width direction based on both tape variance and head position information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the recording track width is narrowed to increase recording density, then the recording capacity increases, but the magnetic head fails to follow the recording track accurately, resulting in increased off-track values and errors
Solution Approach 1:
The patent applies preliminary action by reading tape variance information before data reproduction and using it to predict and correct head position in advance. The system reads servo signals and calculates expected head position deviations, then pre-adjusts the head position to compensate for anticipated tracking errors, enabling accurate tracking on narrowed recording tracks without waiting for real-time error feedback
Solution Approach 2:
The patent implements dynamics by continuously adjusting the head position based on real-time servo signal feedback and calculated off-track values. The system dynamically modifies head positioning during data reproduction to adapt to tape motion variations, allowing the head to maintain accurate tracking on narrowed tracks despite tape speed changes and positional variations
2Productivity
If the tape speed is increased to improve data processing efficiency, then the productivity increases, but the time required for the magnetic head to follow the recording track increases, resulting in tracking errors
Solution Approach 1:
The patent applies preliminary action by performing head position prediction and correction before high-speed data reproduction begins. The system reads tape variance information and servo signals in advance, calculates expected head position deviations, and pre-adjusts the head position to compensate for anticipated tracking errors, enabling immediate accurate tracking at high tape speeds without time loss
Solution Approach 2:
The patent implements feedback by continuously monitoring servo signals during high-speed operation and using the calculated off-track values to adjust head position in real-time. The system creates a closed-loop control system where head position is constantly corrected based on feedback from servo signal analysis, maintaining accurate tracking even at increased tape speeds
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 method enables magnetic heads to follow recording tracks accurately at high speeds even with narrowed track widths and increased tape speeds, reducing errors and improving data recording and reproduction efficiency.
Implementation Method 1
a servo signal are recorded magnetically in a magnetic layer of a magnetic tape and the servo tracking is carried out by magnetically reading the foregoing servo signal
Data Source
AI summary
A servo controlling method of the present invention is a servo controlling method for controlling a position of a magnetic head against a magnetic tape that is accommodated in a cartridge and has at least a data track and a servo track, and the method includes the steps of: reading tape variance information from a magnetic tape cartridge (23) side, the magnetic tape cartridge (23) being composed of a cartridge (20) and a magnetic tape (21); reading a servo signal recorded in the servo track by the magnetic head and converting the servo signal into head position information; and controlling the position of the magnetic head according to an off-track value based on the tape variance information and an off-track value calculated from the head position information. With this configuration, even in the case where a recording track width is narrowed and a tape speed is increased, the magnetic head can follow a recording track accurately at a high speed.