Magnetic Tape Cartridge Width and Servo Band Control
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Solution Overview
Problem
Magnetic tape cartridges with thinned tapes face reproducing errors due to temporal width direction dimensional changes, leading to inaccurate head tracking and data reproduction.
Innovation Solution
A magnetic tape cartridge design with a thinned tape thickness of 5.3 μm or less, featuring a non-magnetic support and a magnetic layer containing ferromagnetic powder, with controlled tape width differences and servo band intervals to minimize temporal deformation and enhance tracking accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the magnetic tape is decreased to increase recording capacity, then the recording capacity is improved, but reproducing errors occur more easily
Solution Approach 1:
The patent applies parameter changes by precisely controlling the tape thickness to 5.3 μm or less, the tape width difference (Winner-Wouter) to 4.1 μm to 19.9 μm, and the servo band interval difference (Ginner-Gouter) to -3.9 μm to 0.0 μm. These specific parameter ranges optimize the balance between recording capacity and reproducing reliability, allowing thin tapes to be used without excessive reproducing errors.
Solution Approach 2:
The patent implements preliminary action by pre-defining and controlling the tape width difference and servo band interval difference during manufacturing. By establishing these parameters in advance before the tape is put into service, the system ensures that even thinned tapes maintain adequate tracking accuracy and minimize reproducing errors throughout their operational life.
2Measurement precision
If the magnetic head follows the data band with high accuracy, then data reproduction accuracy is improved, but temporal width direction dimensional changes cause tracking inaccuracy
Solution Approach 1:
The patent applies preliminary action by pre-controlling the tape width difference and servo band interval difference during manufacturing. This preliminary establishment of dimensional parameters compensates for temporal width direction dimensional changes that occur during tape storage and usage, ensuring the magnetic head can maintain accurate tracking throughout the tape's operational lifespan.
Solution Approach 2:
The patent implements universality by designing the tape structure with controlled width differences and servo band intervals that serve multiple functions: they provide reference signals for head tracking while simultaneously compensating for temporal dimensional changes. This multi-functional design ensures both initial tracking accuracy and long-term dimensional stability.
Data Source
AI summary
In the magnetic tape cartridge, a tape has a tape thickness of 5.3 μm or less, and a difference Winner−Wouter between a tape width Winner at a position of 50 m±1 m from a tape inner end and a tape width Wouter at a position of 50 m±1 m from a tape outer end is 4.1 μm to 19.9 μm as a value measured on 100th day from a date of magnetic tape cartridge manufacture, and a difference Ginner−Gouter between a servo band interval Ginner in a range of 49 m to 51 m from the tape inner end and a servo band interval Gouter in a range of 49 m to 51 m from the tape outer end is −3.9 μm to 0.0 μm as a value measured on 100th day from the date of magnetic tape cartridge manufacture.