Indium Seal Assembly for Low-Outgassing Drive Enclosures
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Solution Overview
Problem
Hard disk drives using polymer-based form-in-place-gaskets (FIPGs) outgas, leading to contamination of internal components and performance issues due to deposited materials.
Innovation Solution
Employing indium-based seals that minimize outgassing, using metallic seals or electroplated indium to create hermetic seals between the cover and base of the hard disk drive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polymer-based form-in-place-gaskets (FIPGs) are used for sealing, then ease of manufacture is improved, but outgassing occurs leading to contamination of internal components
Solution Approach 1:
The patent changes the material parameter from polymer-based FIPG to indium-based seal. This material substitution fundamentally alters the outgassing characteristics while maintaining sealing functionality. The indium-based seal is applied as a metallic coating or deposited layer, transforming the sealant from organic polymer to inorganic metal material, thereby eliminating outgassing issues.
Solution Approach 2:
The patent employs indium-based composite sealing materials that combine metallic indium with other materials to create a sealant that provides both hermetic sealing and minimal outgassing. The indium-based seal may be applied over adhesive layers or integrated with metal surfaces, creating a composite sealing system that overcomes the limitations of pure polymer-based FIPGs.
2Object-generated harmful factors
If indium-based seals are used, then outgassing is minimized reducing contamination, but manufacturing complexity increases
Solution Approach 1:
The indium-based seal is applied in advance during the manufacturing process, forming a permanent hermetic seal before the device is assembled and put into service. The sealant is deposited or applied to the sealing surfaces prior to final assembly, eliminating the need for subsequent sealing operations and reducing overall manufacturing complexity despite the specialized application process.
Solution Approach 2:
The patent replaces the mechanical compression and deformation mechanism of traditional FIPGs with a deposition or coating mechanism for indium-based seals. Instead of mechanically compressing a polymer gasket to create a seal, the indium-based seal is applied as a coating that forms a hermetic barrier through material deposition, adhesion, or cold welding, thereby reducing mechanical complexity.
3Reliability
If hermetic seals are created using indium, then reliability of data storage is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the sealing mechanism from mechanical compression of polymer to metallic bonding or adhesion of indium-based materials. This parameter change in the sealing mechanism provides more consistent and reliable hermetic seals with better control over seal integrity, reducing variability in sealing performance and improving overall reliability.
Solution Approach 2:
The indium-based seal acts as an intermediary material between the adhesive layer and the metal housing surfaces. It provides a intermediate bonding layer that facilitates hermetic sealing through metallic adhesion or cold welding, bridging the gap between dissimilar materials and ensuring reliable sealing while accommodating surface variations.
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
Prevents contamination of internal components by reducing outgassing, ensuring reliable data storage and performance by maintaining a clean internal environment.
Implementation Method 1
applying a force to the cover to compress the seal to create a hermetic seal
Data Source
AI summary
An electronic device includes a cover coupled to a base to create an enclosure. One or more electronic components are positioned within the enclosure. A metallic seal is positioned between the cover and the base. The seal can be formed as a pre-cut gasket comprising indium or a layer of electroplated indium.