Fingerprint Chip Mounting via Positioning Structures
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Solution Overview
Problem
The mounting process of fingerprint chip package structures in mobile devices is affected by unexpected movement, which complicates the assembly and can lead to instability and damage, particularly when using touch panels with through holes.
Innovation Solution
An input assembly is designed with a reinforcing plate, a first flexible circuit board, a fingerprint chip package structure, and a fixed plate, where the reinforcing plate has a first positioning structure that fits with a second positioning structure on the fixed plate to limit movement, ensuring secure fixation of the fingerprint chip package structure and improving assembly efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the fingerprint chip package structure is mounted into a through hole in the touch panel, then the fingerprint recognition function is integrated into the terminal, but the fingerprint chip package structure may have unexpected movement during mounting, affecting the mounting process
Solution Approach 1:
The solution divides the mounting structure into multiple components: a fixing plate fixed to the terminal, a reinforcing plate with positioning structures, and positioning structures on the touch panel. This segmentation allows each component to perform its specific function - the fixing plate provides stable base mounting, the reinforcing plate prevents deformation and provides positioning, and the touch panel positioning structures guide accurate placement. Together they resolve the movement issue while maintaining integration.
Solution Approach 2:
The fixing plate is fixed to the terminal beforehand, and the reinforcing plate is prepared with positioning structures before the fingerprint chip package structure is mounted. These preliminary actions establish a stable foundation and positioning framework in advance, preventing unexpected movement during the actual mounting process and ensuring manufacturing precision.
2Device complexity
If the fingerprint chip package structure is mounted without additional reinforcement, then the assembly process is simpler, but the fingerprint chip package structure may move unexpectedly, affecting mounting and causing instability
Solution Approach 1:
The solution merges multiple functions into the reinforcing plate: it reinforces the touch panel area, provides positioning structures for the fingerprint chip package structure, and connects to the fixing plate. This consolidation achieves reliable stabilization without significantly increasing assembly complexity, as the reinforcing plate is a single component that performs multiple functions simultaneously.
Solution Approach 2:
The reinforcing plate acts as an intermediary component between the fixing plate and the fingerprint chip package structure. It transfers and distributes mounting forces, provides positioning guidance, and prevents direct stress on the fingerprint chip package structure, thereby ensuring stability while maintaining a manageable assembly process.
3Manufacturing precision
If positioning structures are added to prevent movement, then the mounting stability is improved, but the device structure becomes more complex
Solution Approach 1:
The positioning structures are localized to specific areas where they are most needed - on the reinforcing plate and the touch panel - rather than distributing complexity throughout the entire device. This localized approach provides necessary mounting stability at critical points while keeping the overall device structure relatively simple and manageable.
Data Source
AI summary
A method for manufacturing an input assembly, an input assembly and a terminal are provided. The input assembly includes a reinforcing plate, a first flexible circuit board, a fingerprint chip package structure and a fixed plate. The reinforcing plate has a first positioning structure and configured to reinforce the first flexible circuit board and the fingerprint chip package structure. The first flexible circuit board is fixed on the reinforcing plate. The fingerprint chip package structure is fixed on the first flexible circuit board. The fixed plate is fixed to the terminal and has a second positioning structure. The first positioning structure is configured to be fitted with the second positioning structure, so as to limit a movement of the reinforcing plate relative to the fixed plate.