Disk Device Flexible Circuit Reinforcement for Gap Contaminant Removal
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Solution Overview
Problem
Contaminants such as flux can remain unremoved in the gaps between the flexible printed circuit board and electronic components in disk devices, potentially leading to failures like head crashes.
Innovation Solution
Incorporating a rigid reinforcing plate with through holes that align with gaps on the flexible printed circuit board, allowing cleaning liquid to flow through and remove contaminants effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electronic components are mounted on the flexible printed circuit board, then the device functionality is improved, but gaps between components and the board remain where contaminants can accumulate
Solution Approach 1:
A reinforcing plate is introduced as an intermediary component between the flexible printed circuit board and the electronic components. This plate has through-holes that align with gaps between components and the board, allowing cleaning liquid to flow through and remove contaminants that would otherwise accumulate in these gaps.
Solution Approach 2:
The reinforcing plate functions as a porous structure with through-holes that enable fluid penetration. These holes allow cleaning liquid to access and flush out contaminants from the gap regions between electronic components and the flexible printed circuit board, effectively addressing the contaminant accumulation problem.
2Ease of operation
If the flexible printed circuit board is kept flexible, then ease of installation and connection is improved, but structural strength decreases making it vulnerable to damage
Solution Approach 1:
The reinforcing plate is combined with the flexible printed circuit board by attaching it to the board. This merging provides the flexible board with additional structural strength and rigidity from the plate, while the board maintains its inherent flexibility for connection purposes. The combination allows the assembly to benefit from both the flexibility of the board and the strength of the plate.
Solution Approach 2:
The assembly of the flexible printed circuit board and the rigid reinforcing plate creates a composite structure. This composite combines materials with different properties - the flexible polymer-based circuit board and the rigid plate material - to achieve a structure that exhibits both flexibility and enhanced strength, resolving the contradiction between these two requirements.
Data Source
AI summary
A disk device includes a magnetic disk, a magnetic head, a flexible printed circuit board, an electronic component, and a wall. The flexible printed circuit board is electrically connected to the magnetic head. The electronic component is mounted on the flexible printed circuit board. The wall has rigidity higher than the flexible printed circuit board and is attached to the flexible printed circuit board. The flexible printed circuit board with a first through hole includes a first surface facing the electronic component with a gap, and a second surface opposite the first surface and facing the wall, the first through hole being open to the first surface and the second surface to communicate with the gap. The wall is provided with a second through hole penetrating the wall to communicate with the first through hole.