Leader Tape Layered Structure for Magnetic Tape Cartridge
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Solution Overview
Problem
Magnetic tape cartridges face issues with tape jamming, leader tape damage, and increased dropouts due to tape deformation transfer during long-term storage or high-temperature running, especially with high recording densities, leading to recording failures and information loss.
Innovation Solution
A leader tape with a non-magnetic underlayer and a magnetic upper layer, where the F5 values in the machine and transverse directions are between 80 to 120 MPa, and the difference is 15 MPa or less, with a thickness of 0.1 to 2.0 μm, and surface electrical resistances of up to 1010 Ω/sq, is used to prevent deformation transfer and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional single-layer magnetic leader tape is used, then the leader tape has sufficient strength to prevent tape jamming and damage, but the surface of the leader tape gets scratched during load/unload cycles, causing scrapings to attach to the running system and transfer to the magnetic tape, increasing dropouts and error rates
Solution Approach 1:
The leader tape is divided into two distinct layers: a non-magnetic underlayer providing mechanical strength and scratch resistance, and a magnetic upper layer preventing contact between the magnetic tape and running system. This segmentation allows each layer to fulfill its specific function without interfering with the other, solving both the strength and reliability problems simultaneously.
Solution Approach 2:
The invention uses a composite structure combining non-magnetic and magnetic materials in a layered configuration. The non-magnetic underlayer (e.g., polyester base) provides durability and scratch resistance, while the magnetic upper layer (e.g., gamma-ferric oxide or chromium dioxide) prevents direct contact between the magnetic tape and the running system, thereby reducing dropouts and error rates.
2Quantity of substance
If the recording density of the magnetic tape cartridge is increased to enhance capacity, then the storage capacity improves, but spacing loss due to transfer of tape deformation from the leader tape to the data recording magnetic tape becomes more remarkable
Solution Approach 1:
By segmenting the leader tape into non-magnetic and magnetic layers, the invention isolates the magnetic interactions to the upper layer, preventing deformation and magnetic interference from transferring to the data recording magnetic tape. This maintains precise spacing even at high recording densities.
Solution Approach 2:
The invention changes the magnetic properties of the leader tape by introducing a non-magnetic underlayer, which alters the mechanical and magnetic parameters of the overall structure. This parameter change reduces the transfer of tape deformation to the data recording magnetic tape, minimizing spacing loss.
3Strength
If a leader tape with higher strength than magnetic tape is used to prevent leader block level difference transfer, then the leader tape strength increases, but the non-magnetic underlayer and magnetic upper layer structure requires precise control of thickness and material properties to avoid introducing new deformation issues
Solution Approach 1:
The invention specifies precise parameter ranges for the non-magnetic underlayer and magnetic upper layer, including thickness (e.g., 1-5 μm for underlayer, 0.5-2 μm for upper layer) and material properties. By controlling these parameters within defined ranges, the invention achieves the desired strength while preventing excessive deformation transfer to the magnetic tape.
Data Source
AI summary
A leader tape where an non-magnetic under layer that contains a powder and a binder and a magnetic upper layer are sequentially laminated on at least one face of a support, in which F5 values of the support in a machine direction (MD) and in a transverse direction (TD) are from 80 to 120 MPa respectively, the F5 value in MD is larger than that in TD, and a difference between the F5 value in MD and that in TD is 15 MPa or less.