Magnetic Disk Desiccant Segmentation for Humidity Control

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Solution Overview

Problem

In magnetic disk devices, the desiccant used for humidity control is exposed to air for an extended period during assembly, leading to reduced moisture absorption performance and potential saturation before the housing is sealed, which affects the reliability and functionality of the device.

Innovation Solution

The magnetic disk device incorporates a desiccant unit at the inner cover facing the base and another at the outer cover, with controlled exposure to air at different stages of assembly, using reversible and irreversible adsorbents to maintain humidity control and prevent saturation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the desiccant is sealed in the housing after assembly, then humidity control is achieved, but the desiccant is exposed to air for an extended period leading to reduced moisture absorption performance

Engineering Contradiction:

Improvehumidity controlVSAvoidair exposure time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The housing is divided into a first housing and a second housing that are coupled together. The desiccant is placed in the first housing and sealed before coupling, while the second housing remains open for component assembly. This segmentation allows the desiccant to be pre-sealed in a controlled environment, minimizing air exposure time while still enabling post-assembly humidity control for the entire device.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The desiccant is pre-installed and sealed in the first housing before the second housing is coupled to form the complete assembly. This preliminary action ensures the desiccant is protected from air exposure during the main assembly process, maintaining its moisture absorption performance while achieving the goal of sealed humidity control in the final product.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the desiccant is sealed early in the process, then moisture absorption performance is maintained, but access to the housing interior for component assembly is limited

Engineering Contradiction:

Improvemoisture absorption performanceVSAvoidcomponent assembly access

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The housing is segmented into two separate parts: the first housing containing the pre-sealed desiccant, and the second housing that remains open for component assembly. This segmentation resolves the contradiction by allowing the desiccant to be sealed early (maintaining performance) while the second housing provides easy access for assembling components like magnetic disks, motors, and circuit boards before final coupling.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The second housing acts as an intermediary that provides access to the housing interior during assembly without compromising the sealed desiccant in the first housing. Components can be assembled in the second housing, then the two housings are coupled together, with the desiccant serving as a mediator that protects the internal environment from moisture while allowing the assembly process to proceed.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If the housing is completely sealed, then humidity control is effective, but the desiccant may saturate before the housing is sealed

Engineering Contradiction:

Improvehumidity control effectivenessVSAvoiddesiccant functionality period

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The desiccant is pre-installed and sealed in the first housing before the second housing is coupled. This preliminary sealing action ensures the desiccant is protected from air exposure during assembly, preventing premature saturation and extending its functional period while maintaining effective humidity control in the sealed final product.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

By segmenting the housing into two parts with the desiccant sealed in the first housing, the system allows for controlled humidity management. The desiccant is protected from excessive air exposure during assembly, preventing early saturation, while the sealed configuration ensures effective humidity control throughout the device's operational life.

Inventive Principle:

Principle #1Segmentation

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 allows for precise humidity control and extended functionality by minimizing desiccant saturation, ensuring effective moisture absorption and maintaining a dry environment within the housing.

Implementation Method 1

a first desiccant unit 110 that is provided at the inner cover 22 to face the base 21... and a second desiccant unit 120 that is provided at the outer cover 23... to control humidity

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentUS20260018191A1Magnetic disk device with desiccant units mounted to inner and outer covers

Publication Date: 2026.01.15 KK TOSHIBA

AI summary

A magnetic disk device according to an embodiment includes a housing in which a base, an inner cover provided with a first through-hole, and an outer cover are combined in this order and hermetically sealed, a magnetic disk that is stored in the housing, a first desiccant unit that is provided at the inner cover to face the base at a position away from the base, and a second desiccant unit that is provided at the outer cover and inserted into an internal space of the housing through the first through-hole provided in the inner cover to face the base at a position away from the base.