Magnetic Disk Desiccant Assembly for Limited Air Exposure
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Solution Overview
Problem
In magnetic disk devices, prolonged exposure of desiccant to atmosphere during assembly can lead to reduced hygroscopicity and saturation, affecting humidity control and reliability, especially in He-sealed HDDs.
Innovation Solution
A desiccant assembly with a case, sealing film, and filter is used, where the desiccant is enclosed in a first chamber and communicates with the housing via a needle that penetrates the sealing film, allowing quick assembly and minimal exposure to atmosphere, maintaining hygroscopicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If desiccant is enclosed in housing with sealing, then humidity control reliability is improved, but assembly complexity and time increase due to additional sealing processes
Solution Approach 1:
The desiccant container is merged with the housing structure by integrating the sealing function into the housing itself. The housing includes a through-hole that directly communicates with the desiccant container, eliminating the need for separate sealing components and processes. This integration maintains reliable humidity control while simplifying assembly.
Solution Approach 2:
The desiccant container is pre-filled with desiccant material before assembly, and the sealing structure is pre-configured in the housing. The through-hole is positioned in advance to align with the desiccant container opening, allowing rapid assembly without complex sealing operations. This preliminary preparation reduces assembly time while maintaining sealing reliability.
2Ease of operation
If desiccant is exposed to atmosphere during assembly, then assembly ease is improved, but desiccant hygroscopicity deteriorates due to prolonged exposure
Solution Approach 1:
The housing structure serves as an intermediary barrier between the desiccant and the external atmosphere. The through-hole provides a controlled interface that allows assembly operations while minimizing direct exposure. The sealing structure around the through-hole acts as a mediator to prevent atmospheric moisture from reaching the desiccant during and after assembly.
Solution Approach 2:
The assembly process is designed to minimize the time the desiccant is exposed to atmosphere. The through-hole allows rapid insertion and sealing of the desiccant container without prolonged exposure. By rushing through the assembly process quickly and maintaining sealing integrity, the desiccant hygroscopicity is preserved while still allowing ease of assembly.
3Reliability
If sealing structure is added to desiccant container, then contamination prevention is improved, but manufacturing complexity increases
Solution Approach 1:
The sealing structure is merged with the housing rather than being a separate component. The through-hole is formed directly in the housing structure, and the sealing function is integrated into the housing design. This eliminates the need for separate sealing components and reduces manufacturing complexity while maintaining effective contamination prevention.
Solution Approach 2:
A flexible sealing film or membrane is used to seal the through-hole in the housing. This thin film provides effective sealing against contamination while being easy to manufacture and install. The flexible nature of the sealing film allows it to conform to the housing structure, ensuring reliable sealing without complex manufacturing processes.
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
This configuration ensures effective humidity control and improved reliability by maintaining desiccant hygroscopicity, reducing manufacturing time, and preventing contamination.
Implementation Method 1
desiccant assembly includes: a case including an opening on a surface facing the base, a sealing film provided at the opening, a division filter that divides space of the case into a first chamber and a second chamber, the second chamber including the opening, and desiccant filled in the first chamber
Implementation Method 2
the second chamber communicates with the internal space of the housing by the needle penetrating the sealing film
Data Source
AI summary
A magnetic disk device of an embodiment includes: a housing in which a base and a cover are combined and airtightly closed; a magnetic disk housed in the housing; a needle protruding upward in an internal space of the housing; and a desiccant assembly provided on the cover so as to face the base away from the base by a predetermined distance, in which the desiccant assembly includes: a case including an opening on a surface facing the base, a sealing film provided at the opening, a division filter that divides space of the case into a first chamber and a second chamber, the second chamber including the opening, and a desiccant filled in the first chamber, and the second chamber communicates with the internal space of the housing by the needle penetrating the sealing film.