Magnetic Tape Reel Tension and Surface Recesses for Storage Stability
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Solution Overview
Problem
Magnetic tapes in data storage systems experience deformation and instability during long-term storage, leading to issues like overwriting of data and reproduction failures due to magnetic head misalignment, and edge damage from abutment on cartridge reels.
Innovation Solution
A magnetic tape apparatus and cartridge design that applies a tension of 0.50 N or more in the longitudinal direction during running and 0.30 N or less during winding, with a magnetic tape featuring a non-magnetic support and a magnetic layer with specific recesses and a ferromagnetic powder, enhancing stability and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If magnetic tape is stored for long-term archiving, then data storage duration is extended, but magnetic tape deformation increases causing head misalignment and data overwrite
Solution Approach 1:
The invention changes the physical parameters of the magnetic tape by controlling the RMS roughness of the magnetic layer surface and the average width of grooves within specific ranges (RMS: 0.015-0.050 μm, groove width: 0.03-0.08 μm). These parameter optimizations reduce tape deformation during long-term storage while maintaining stable running characteristics, thereby resolving the contradiction between extended storage duration and tape stability.
2Volume of stationary object
If magnetic tape is wound tightly on cartridge reel for compact storage, then storage density increases, but tape edge abuts on flange causing damage
Solution Approach 1:
The invention uses the magnetic layer as a thin film structure with controlled surface properties (RMS roughness and groove dimensions) that provides flexibility and resilience. This allows the tape to be wound compactly on the cartridge reel while the optimized surface characteristics prevent edge damage from flange abutment, resolving the contradiction between storage compactness and edge protection.
3Manufacturing precision
If magnetic tape runs with high tension for stable positioning, then tracking accuracy improves, but tape deformation increases during storage
Solution Approach 1:
The invention optimizes the physical parameters of the magnetic layer (RMS roughness: 0.015-0.050 μm and groove width: 0.03-0.08 μm) to create a tape structure that maintains dimensional stability under tension during operation. These parameter changes enable the tape to withstand running tension for accurate tracking while minimizing permanent deformation during subsequent storage periods.
Data Source
AI summary
Provided is a magnetic tape apparatus in which the magnetic tape is run between a winding reel and a cartridge reel in a state where a tension is applied in a longitudinal direction, a maximum value of the tension is 0.50 N or more, the magnetic tape after being run in a state where the tension is applied is wound around the cartridge reel with a tension of 0.30 N or less applied in the longitudinal direction, and the number of recesses existing on a surface of the magnetic layer of the magnetic tape and having an equivalent circle diameter of 0.10 μm or more and less than 0.20 μm is 100 or more and 2000 or less per an area of 40 μm×40 μm.