Leader Tape Surface Roughness and Cupping Control
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Solution Overview
Problem
Conventional leader tapes in magnetic tape cartridges are prone to reflection and irregular winding due to dimensional precision issues, leading to tape deformation and potential loss of information during data recording and reproduction, especially at high temperatures or over long periods.
Innovation Solution
A leader tape with a specific surface roughness (Ra of 10 to 60 nm) and cupping (0 to 1 mm) is developed, featuring a coating layer with a finely particulate inorganic powder and binder, which helps in preventing reflection and irregular winding by creating a proper space between tapes and relieving pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the leader block end face is curved to match the core portion arc, then smooth winding is achieved, but dimensional precision issues cause the end face to project from the core portion, generating level differences
Solution Approach 1:
The leader block end face is pre-formed with a curved surface that matches the arc of the core portion winding face. This preliminary shaping ensures that when the leader block is installed, its end face aligns properly with the winding surface, preventing projection and level differences before the winding process begins.
Solution Approach 2:
The invention changes the geometric parameters of the leader block end face by curving it to match the core portion's arc. This parameter modification (from flat to curved) allows the leader block to conform to the winding surface, eliminating dimensional mismatches and ensuring smooth tape winding without projection issues.
2Manufacturing precision
If the leader block dimensional precision is improved to eliminate projection, then level differences are reduced, but manufacturing complexity increases
Solution Approach 1:
Instead of demanding extremely tight dimensional tolerances on a flat leader block end face, the invention changes the geometric parameter by curving the end face to match the core portion's arc. This parameter transformation converts a precision tolerance problem into a geometric shaping problem, reducing manufacturing complexity while achieving the same level difference reduction.
3Stability of the object's composition
If a rigid leader tape is used to prevent tape reflection, then positioning stability is improved, but the tape cannot accommodate irregular winding and deformation
Solution Approach 1:
The leader tape is constructed as a flexible thin film that can conform to the winding surface and accommodate irregularities. This flexibility allows the tape to adapt to minor winding deviations and deformations without causing reflection or damage, while maintaining sufficient stability for proper positioning during operation.
Data Source
AI summary
A leader tape comprising a support and a coating layer containing a powder and a binder, wherein at least one surface of the leader tape has a center line average roughness (Ra) of from 10 to 60 nm, and the leader tape has a cupping of from 0 to 1 mm per a width of ½ inch.