Optical Tape Servomark Formatting for Track Positioning
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Solution Overview
Problem
The challenge in optical tape manufacturing is creating precise and efficient formatting of tracks that allows for reliable data recording and reading, as traditional groove creation methods are time-consuming and uneconomical for hundreds of meters of tape with thousands of parallel tracks.
Innovation Solution
The method involves creating servomarks on the tape during high-speed movement in the tangential direction, aligned in the longitudinal direction to form strings, enabling precise track following and synchronization, and allowing for simultaneous formatting of all tracks in a single pass, using a 'sampled servo' system for tracking information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional groove creation methods are used for optical tape manufacturing, then precise track positioning is achieved, but the production process becomes time-consuming and uneconomical
Solution Approach 1:
The patent divides the continuous groove structure into discrete servomarks at specific intervals along each track. These segmented marks are sufficient for positioning purposes while dramatically reducing manufacturing complexity and time compared to creating continuous grooves across hundreds of meters of tape with thousands of tracks.
Solution Approach 2:
Instead of creating continuous physical grooves and then using them for positioning, the patent inverts the approach by creating discrete servomarks that serve the positioning function. This inversion eliminates the need for complex groove formation while maintaining precise track following capability through optical detection of the marks.
2Productivity
If discrete servomarks are created instead of continuous grooves, then production efficiency improves, but positioning precision may be compromised
Solution Approach 1:
The servomarks are created during the formatting step before actual data recording. This preliminary action establishes the positioning infrastructure in advance, allowing the playback system to acquire tracking information quickly when transitioning between tracks, thereby maintaining precision without compromising productivity.
Solution Approach 2:
The patent uses optical copying/detection of servomark patterns to generate tracking error signals. The playback system reads the discrete servomarks and uses them to generate servo information, effectively copying the positioning function from the physical marks to the electronic tracking system, maintaining precision while enabling fast formatting.
3Speed
If servomarks are aligned in the tangential direction for random-access track jumps, then access speed improves, but clock synchronization between tracks becomes challenging
Solution Approach 1:
The patent employs feedback mechanisms where the playback system detects servomarks and uses them to regenerate clock and tracking servo sample signals. This feedback loop ensures that clock synchronization is maintained across tracks even when jumps are optimized for speed, as the system continuously adjusts based on detected mark positions and timing.
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 approach enables fast, reliable, and efficient formatting of optical tape, ensuring precise tangential and longitudinal position information for accurate data recording and reading, facilitating random-access track jumps and maintaining clock synchronization across tracks.
Implementation Method 1
servomarks are created on the tape while moving over the tape with high speed in the tangential direction
Implementation Method 2
These patterns will be used during read/write operation of the tape to generate tracking information using a 'sampled servo' system
Data Source
AI summary
Methods and systems for formatting of optical media used for data or information storage.