Weld Bead Shield for Hermetic HDSI Impact Protection
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Solution Overview
Problem
Hermetically sealed hard disk drives face damage to their weld beads during handling and installation, leading to gas leakage and contamination, as existing solutions fail to adequately protect the external welds from impact damage.
Innovation Solution
A shield system is coupled to the exterior of the hermetically sealed housing over the weld bead, using pressure-sensitive adhesive tape and a flexible, L-shaped or bulbous design to absorb impacts and maintain the seal, ensuring the weld bead remains undamaged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hard disk drive is hermetically sealed with a weld bead, then the hermetic seal is maintained, but the weld bead becomes vulnerable to impact damage during handling and installation
Solution Approach 1:
A shield is attached to the exterior surface of the housing over the weld bead before the drive is handled or installed. The shield acts as a protective barrier that absorbs or deflects impact forces, preventing direct contact between external objects and the vulnerable weld bead. This prior cushioning approach maintains the hermetic seal integrity while protecting against impact damage during handling and installation operations.
2Object-affected harmful factors
If a shield is added to protect the weld bead, then impact damage is prevented, but the device complexity increases
Solution Approach 1:
The shield is constructed from a flexible material such as a polymer or thin metal sheet, allowing it to be formed into a thin, lightweight structure that conforms to the housing surface. This flexible construction provides effective impact protection while minimizing the increase in device complexity and maintaining a compact form factor.
Solution Approach 2:
The shield serves as an intermediary element between the external environment and the weld bead. It is attached to the housing exterior using adhesive tape, creating a protective interface that absorbs impact forces before they can reach the weld bead, thus preventing damage without requiring structural modifications to the housing itself.
3Strength
If the shield is made from rigid material, then impact resistance is improved, but the shield may transmit excessive force to the weld bead
Solution Approach 1:
The shield's material properties are selected to achieve optimal force absorption characteristics. By choosing materials with appropriate flexibility and damping properties, the shield can withstand impact forces while gradually dissipating the energy through deformation, rather than rigidly transmitting the full impact force to the weld bead. This parameter optimization balances protection capability with force mitigation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The shield system effectively absorbs impact forces, preventing damage to the weld bead and maintaining the hermetic seal, thereby reducing gas leakage and contamination risks during handling and installation.
Implementation Method 1
The pressure-sensitive adhesive tape can be interposed directly between the cover and the shield
Implementation Method 2
A shield system is coupled to the exterior of the hermetically sealed housing over the weld bead, using pressure-sensitive adhesive tape and a flexible, L-shaped or bulbous design to absorb impacts
Data Source
AI summary
Described herein is a system that includes a hard disk drive. The hard disk drive includes a base and a cover welded to the base by a weld bead. The base and the cover form a hermetically sealed housing. The system further includes a shield, coupled to an exterior of the hermetically sealed housing over the weld bead. The shield also is spaced-apart from the weld bead.