Metallic Plate Touching Surface Roughness Control for Tape Cartridge Noise
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Solution Overview
Problem
The use of a metallic plate as a touching surface in a recording tape cartridge can lead to damage and disorder in the behavior of the release member, resulting in noise during reel rotation, especially when the arithmetic mean roughness exceeds 0.3 μm.
Innovation Solution
A metallic plate structure is designed with a touching surface that is integrally rotatable with the reel, featuring a circular shape with a sunken portion and ear portions, ensuring the surface is not in contact with other plates when stacked, and is fabricated to maintain an arithmetic mean roughness of 0.1 μm or less, preventing damage and tilting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a metallic plate is provided at a release member to reduce friction during reel rotation, then the friction is reduced and access time is shortened, but the touching surface becomes susceptible to damage and disorder in behavior when roughness exceeds 0.3 μm
Solution Approach 1:
The patent applies preliminary action by providing a protective structure (protrusion or recess) on the metallic plate before the touching surface can be damaged. This protective feature prevents direct contact and potential damage to the touching surface during stacking or handling, while still allowing the metallic plate to function as intended during reel rotation. The protection is built in advance to prevent future damage that would occur if the surface roughness exceeded 0.3 μm.
2Ease of manufacture
If the touching surface roughness increases to 0.3 μm or more, then manufacturing cost may be reduced, but noise is generated during reel rotation due to disordered release member behavior
Solution Approach 1:
The protective protrusion or recess structure is built into the metallic plate during manufacturing, providing preliminary protection against noise generation. This structure ensures that even if the touching surface roughness increases, the protective feature prevents direct contact that would cause disordered behavior and noise during reel rotation, thereby allowing more cost-effective manufacturing processes.
3Loss of time
If a metallic plate is used instead of a resin member, then friction is reduced and access time is shortened, but the touching surface becomes vulnerable to damage during handling and stacking
Solution Approach 1:
The patent applies preliminary action by incorporating a protective protrusion or recess structure on the metallic plate before it can be damaged during handling or stacking. This protective feature is built in advance to prevent direct contact and potential damage to the touching surface, while still allowing the metallic plate to provide low-friction performance during reel rotation.
Solution Approach 2:
The protective protrusion or recess structure acts as beforehand cushioning by providing a physical barrier that prevents direct contact between touching surfaces of stacked metallic plates. This cushioning effect is built in advance to absorb or prevent impact forces during handling and stacking, thereby protecting the touching surface durability while maintaining the low-friction benefits of the metallic plate.
Data Source
AI summary
A metallic plate that is a structure of a release member, the release member being configured to be integrally rotatable with a reel accommodated in a case, and the release member moving a locking member from a locking position, at which the locking member locks rotation of the reel relative to the case, to an allowing position, at which the locking member allows rotation of the reel. The metallic plate comprises a touching surface that is to be touched by a distal end of a sliding protrusion portion that protrudes from the locking member; and a structure such that, if a plurality of the metallic plate are stacked in a plate thickness direction in a state in which the metallic plates are not attached to release members, the touching surface of each metallic plate is not in contact with any other of the metallic plates.