Desiccant Package Humidity Control for Disk Drives
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Solution Overview
Problem
Disk drives and other electronic/mechanical components face performance and longevity issues due to uncontrolled environmental conditions such as humidity, which can lead to head-to-disk stiction, media corrosion, and excessive wear.
Innovation Solution
A package with a desiccant material and liquid is used to control humidity levels within an enclosure by absorbing and releasing water vapor, maintaining a target relative humidity through a sealed channel that allows controlled moisture transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a desiccant material is placed inside the enclosure to absorb moisture, then humidity control is improved, but the device complexity increases
Solution Approach 1:
The patent places the desiccant material inside a sealed package that is then placed inside the enclosure. This nested structure allows the desiccant to be contained and protected while still functioning within the enclosure environment, resolving the contradiction by organizing components in a hierarchical manner that maintains reliability without proportionally increasing complexity.
Solution Approach 2:
The sealed package acts as an intermediary between the desiccant material and the enclosure environment. The package controls the interaction between the desiccant and surrounding humidity, allowing moisture absorption to occur through a controlled interface (membrane or passageway) rather than direct exposure, thus maintaining reliability while managing the complexity of the system architecture.
2Productivity
If the desiccant material is directly exposed to the enclosure environment, then moisture absorption efficiency is improved, but the risk of contamination and performance degradation increases
Solution Approach 1:
The patent uses a flexible membrane within the sealed package that allows water vapor to pass through while blocking contaminants. This thin film structure enables the desiccant material to absorb moisture efficiently from the enclosure environment without direct exposure to dust, particles, or other harmful contaminants that would degrade its performance over time.
Solution Approach 2:
The sealed package creates a localized controlled environment for the desiccant material, providing different protection levels in different areas. The membrane or controlled passageway allows selective interaction with the enclosure environment, permitting moisture absorption while blocking contaminants, thus resolving the contradiction between absorption efficiency and contamination risk.
3Object-affected harmful factors
If a sealed package with controlled passageway is used for the desiccant, then contamination is reduced, but the moisture absorption rate decreases
Solution Approach 1:
The patent employs porous membranes or materials in the sealed package that provide numerous small pathways for moisture vapor to pass through. These porous structures maintain contamination barriers while allowing adequate moisture absorption rates by creating multiple parallel pathways that collectively maintain sufficient vapor transmission speed without requiring large open passages that would compromise protection.
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 solution effectively maintains a stable humidity level, enhancing the lifespan and performance of components by regulating humidity within a target range, specifically between 6% to 15% relative humidity, thereby reducing issues like stiction and corrosion.
Implementation Method 1
The desiccant absorbs the liquid and operates with the package to provide moisture control upon the opening of a passageway into the package
Implementation Method 2
A liquid is deposited inside the package, and is sealed along with the desiccant in the package
Data Source
AI summary
Aspects of this disclosure are directed to methods, apparatuses and approaches involving the use of a moisture absorbing material (e.g., desiccant) to control moisture. As may be implemented consistent with one or more embodiments, moisture is removed from an environmental control module that includes a desiccant material contained within a package. Liquid is deposited inside the package and sealed with the desiccant in the package.