Disk Device Dual Sealed Space Pressure Management
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Solution Overview
Problem
Magnetic disk drives face challenges in reducing airflow disturbances and maintaining housing integrity due to pressure differences, which affect the performance and recording density of the disks and magnetic heads.
Innovation Solution
The housing is designed with two hermetically closed spaces, each sealed with low-density gas at different pressures, where space A maintains a pressure allowing the magnetic head to fly and space B is set to a lower pressure than the outside environment, preventing deformation and improving recording density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the housing is hermetically closed by laser welding the outer cover to the base, then airtightness is improved, but the outer cover may be deformed when pressure in the housing differs from the use environment pressure
Solution Approach 1:
The housing is divided into two separate enclosed spaces: a first enclosed space containing the magnetic disk and magnetic head, and a second enclosed space between the first enclosed space and outside air. This segmentation allows each space to be independently pressurized, preventing deformation of the outer cover while maintaining hermetic sealing.
Solution Approach 2:
Different pressure conditions are applied to different parts of the housing. The first enclosed space is pressurized to a first pressure that allows the magnetic head to fly, while the second enclosed space is pressurized to a second pressure different from the first pressure and from the outside environment pressure. This local quality approach prevents deformation in the outer cover area while maintaining functional requirements in the inner space.
2Productivity
If low-density gas is sealed in the housing to reduce airflow disturbance, then recording density is improved, but pressure differences cause housing deformation
Solution Approach 1:
The housing is segmented into two independently pressurizable enclosed spaces. The first enclosed space contains the magnetic disk and head and is pressurized to optimize recording density, while the second enclosed space acts as a buffer zone that prevents pressure-induced deformation of the outer cover.
Solution Approach 2:
The second enclosed space acts as an intermediary between the first enclosed space and the outside environment. It provides a pressure transition zone that prevents direct pressure differential effects from deforming the outer cover, while still allowing the first enclosed space to achieve the necessary pressure for high recording density.
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 reduces airflow disturbances, enhances recording density, and prevents housing deformation by independently managing pressures within the sealed spaces, ensuring airtightness and stable operation.
Implementation Method 1
Low-density gas is sealed in each of the first enclosed space and the second enclosed space, and a pressure of the first enclosed space is different from that of the second enclosed space
Implementation Method 2
space B is set to a lower pressure than the outside environment, preventing deformation and improving recording density
Implementation Method 3
The laser welding is performed along the entire outer periphery of the outer cover
Data Source
AI summary
According to one embodiment, a disk device includes a rotatable recording medium, a head, and a housing which includes a first enclosed space accommodating the recording medium and the head, and a second enclosed space defined between the first enclosed space and outside air. Low-density gas is sealed in each of the first enclosed space and the second enclosed space, and a pressure of the first enclosed space is different from that of the second enclosed space.