Leader Tape Composite Structure for Magnetic Tape Cartridge Dropout Reduction
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Solution Overview
Problem
Magnetic tape cartridges face issues with tape jamming, leader tape deformation, and increased dropouts due to the transfer of deformation from the leader block or drive reel, especially during long-term storage and high-temperature running, leading to recording failures and output decreases.
Innovation Solution
A leader tape with a non-magnetic underlayer and a magnetic upper layer, having specific surface roughness and electrical resistance characteristics, is used to prevent deformation transfer and ensure proper tape alignment, thereby reducing dropouts and maintaining output stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-layer magnetic leader tape is used, then the tape structure is simple and manufacturing is easy, but the surface gets scratched during loading/unloading cycles causing scrapings to attach to the running system and transfer to magnetic tape, increasing dropouts
Solution Approach 1:
The leader tape uses a composite structure with a magnetic layer containing Fe-Co alloy particles (20-80 wt%) combined with non-magnetic particles (20-60 wt%), binder (5-30 wt%), and lubricant (1-20 wt%). This composite material provides both mechanical durability to prevent scraping during loading/unloading cycles and magnetic properties to maintain reliability, resolving the contradiction between manufacturing simplicity and dropout prevention.
Solution Approach 2:
The invention changes the particle composition parameters of the magnetic layer, specifically using Fe-Co alloy particles with controlled size distribution (0.01-10 μm) and combining them with non-magnetic particles in specific ratios. This parameter optimization enhances surface durability while maintaining magnetic recording properties, reducing scrapings and dropouts without complicating manufacturing.
2Quantity of substance
If the recording density of magnetic tape cartridge is increased, then the capacity is enhanced, but spacing loss due to transfer of deformation from leader tape to data tape becomes more remarkable
Solution Approach 1:
The invention changes the physical parameters of the leader tape by incorporating lubricant (1-20 wt% based on total composition) and optimizing particle size distribution (0.01-10 μm). These parameter changes reduce friction and deformation during tape winding, preventing deformation transfer to the data tape even at high recording densities, thus maintaining spacing integrity while enabling enhanced capacity.
Solution Approach 2:
The leader tape applies local quality enhancement by concentrating Fe-Co alloy particles (with high saturation magnetization) in the magnetic layer while combining them with non-magnetic particles and lubricant. This localized optimization of material properties at the leader tape level prevents deformation propagation to the data tape, allowing high-density recording without spacing loss.
3Ease of operation
If leader block is housed in the recess of take-up reel, then the leader block forms part of the arc face to smoothly wind up magnetic tape, but the end face may protrude above the core forming unacceptable level difference that causes folding and deformation of leader tape and subsequent magnetic tape
Solution Approach 1:
The invention changes the dimensional parameters and material properties of the leader block by using materials with appropriate elasticity and damping characteristics. The leader block is designed with controlled hardness and elastic modulus to absorb dimensional variations, preventing protrusion and level differences while maintaining smooth tape winding. This parameter optimization resolves the contradiction between winding smoothness and dimensional accuracy.
Solution Approach 2:
The leader block incorporates beforehand cushioning through its material selection and structural design, providing a buffer zone that compensates for dimensional inaccuracies before they can cause protrusion or deformation. This preemptive cushioning effect maintains the arc face geometry and prevents folding of the leader and magnetic tapes during winding operations.
Data Source
AI summary
A leader tape in which an non-magnetic under layer that contains a powder and a binder and a magnetic upper layer are sequentially laminated on at least one side of a support, a center line average roughness (Ra) of a surface of the support is from 30 to 50 nm, and a center line average roughness (Ra) of the multi layer coated surface is larger than that (Ra) of an opposite surface of the support, and the difference is at most 4 nm.