Single Reel Magnetic Tape Cartridge Width Difference Control
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Solution Overview
Problem
Magnetic tape cartridges with thinned tapes face reproducing errors due to temporal width deformations, which increase stress and lead to inaccuracies in data track following by the magnetic head.
Innovation Solution
A magnetic tape cartridge design with a tape thickness of 5.2 μm or less, featuring a non-magnetic support and a magnetic layer with ferromagnetic powder, and controlled tape width differences between the outer and inner ends to minimize deformation and maintain accuracy during data reproduction.
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 width difference (B−A) within the range of 2.4 nm to 12.0 nm at 100 days from manufacture. This parameter control compensates for the reduced mechanical stability of thinned tapes, allowing the tape to maintain sufficient dimensional stability for accurate head tracking despite the reduced thickness enabling higher recording capacity.
2Reliability
If the tape width difference (B−A) is controlled to prevent reproducing errors, then the reproducing accuracy is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies preliminary action by specifying that the tape width difference (B−A) be measured and controlled at 100 days from the date of manufacture. This timing allows the tape to undergo initial environmental conditioning and stress relaxation, establishing a stable baseline width difference before actual use. This preliminary measurement approach ensures that the tape has already adapted to environmental factors, reducing the risk of subsequent width deformations during operation.
3Productivity
If the tape thickness is reduced to accommodate longer tapes in 1 reel, then the productivity is improved, but the tape width deformation increases
Solution Approach 1:
The patent applies parameter changes by establishing a specific range for the tape width difference (B−A) of 2.4 nm to 12.0 nm at 100 days from manufacture. This controlled parameter compensates for the increased width deformation tendency of thinned tapes, allowing longer tape lengths to be accommodated in a single reel while maintaining sufficient width stability for accurate magnetic head following throughout the tape's operational life.
Data Source
AI summary
Provided is a magnetic tape cartridge of a single reel type in which a magnetic tape is wound around a reel, in which the magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, a tape thickness is equal to or smaller than 5.2 μm, a tape width difference (B−A) between a tape width A at a position of 10 m±1 m from a tape outer end and a tape width B at a position of 50 m±1 m from a tape inner end is 2.4 μm to 12.0 μm, and the tape width A and the tape width B are values measured 100 days from the date of magnetic tape cartridge manufacture.