Disk Device PCB Pin-Hole Positioning for Airtight Assembly
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Solution Overview
Problem
The increasing number of magnetic disks in disk devices and decreasing base wall thickness lead to potential gas leakage and reduced manufacturability due to the need for precise positioning and processing of relay connectors and positioning bosses.
Innovation Solution
The use of base-side and board-side positioning portions, with pins and holes, positioned in regions not overlapping the internal space, maintains airtightness and reduces processing complexity by avoiding thin wall areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of magnetic disks is increased and base wall thickness is decreased, then the disk device capacity is improved, but gas leakage risk increases and manufacturability deteriorates
Solution Approach 1:
The positioning boss is extracted from the thin-walled bottom wall region and relocated to the side wall region with sufficient thickness. This separation removes the conflicting requirement of processing positioning holes in thin walls, eliminating the gas leakage risk while maintaining the positioning function.
Solution Approach 2:
The positioning function is transitioned from the bottom wall dimension (thickness direction) to the side wall dimension. By moving the positioning boss to the side wall, the design utilizes a different spatial dimension where wall thickness is not a constraint, resolving the airtightness issue.
2Manufacturing precision
If positioning boss is processed in thin wall thickness portion, then positioning function is achieved, but gas leakage occurs
Solution Approach 1:
The positioning boss is extracted from the problematic thin-walled bottom wall area and placed in the side wall area with adequate thickness. This relocation maintains the positioning accuracy function while eliminating the gas leakage pathway through the thin wall.
3Manufacturing precision
If relay connector is used for positioning, then positioning function is achieved, but attachment accuracy and processing accuracy must be increased
Solution Approach 1:
The positioning function is extracted from the relay connector assembly process and assigned to a dedicated positioning boss structure. This separation allows the relay connector to focus on its electrical connection function while the positioning boss handles positioning, reducing the required accuracy for both components.
Solution Approach 2:
The functions of positioning and electrical connection are segmented into separate components: the positioning boss for positioning and the relay connector for electrical connection. This functional segmentation reduces the complexity and accuracy requirements for each individual component.
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 enhances assembly accuracy, maintains airtightness, and improves manufacturability by preventing gas leakage and relaxing processing accuracy requirements.
Implementation Method 1
One of the base-side positioning portion and the board-side positioning portion includes a pin extending substantially perpendicular to the bottom wall, and another includes a hole into which the pin is fitted
Data Source
AI summary
According to one embodiment, a disk device includes a housing, magnetic disks in the housing, and a printed circuit board attached to an outer surface of a bottom wall of the housing. The housing includes a base including a bottom wall and a side wall, and at least two base-side positioning portions provided on the bottom wall in a region overlapping the side wall. The printed circuit board includes at least two board-side positioning portions each engaged with the base-side positioning portion. One of the base-side positioning portion and the board-side positioning portion includes a pin extending substantially perpendicular to the bottom wall, and another includes a hole into which the pin is fitted.