Flexible Substrate Inspection Pads for Misalignment Tolerance
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Solution Overview
Problem
As electronic components become smaller, the narrow connection terminals in existing electronic apparatuses can lead to misalignment during inspection, causing potential short-circuits between neighboring terminals.
Innovation Solution
The design includes a flexible substrate with first and second contact pads, first wires connecting them, and third inspection contact pads positioned between, allowing for precise alignment and reducing the risk of short-circuits during inspection by accommodating misalignment of inspection contact pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If connection terminals are made narrower to accommodate finer wires, then area of connection terminals is reduced, but misalignment risk increases causing short-circuits
Solution Approach 1:
The contact pad structure is segmented into two distinct types: connection contact pads for product connections and inspection contact pads for inspection purposes. This segmentation allows each type to be optimized independently - connection contact pads can be narrow while inspection contact pads can be wider to accommodate misalignment, thus resolving the contradiction between reducing terminal area and maintaining alignment accuracy
Solution Approach 2:
The flexible substrate acts as an intermediary between the electronic module and the inspection apparatus. It provides a buffer zone that can accommodate misalignment through its flexibility, preventing direct contact between misaligned inspection pins and narrow connection terminals, thereby avoiding short-circuits while maintaining reliable connections
2Manufacturing precision
If inspection contact pads are positioned between first and second contact pads, then alignment tolerance is improved, but device complexity increases
Solution Approach 1:
The flexible substrate serves multiple functions simultaneously: it provides electrical connections, accommodates misalignment through flexibility, positions inspection contact pads to tolerate alignment variations, and prevents short-circuits. This multi-functionality allows the additional inspection contact pads to be integrated without proportionally increasing overall device complexity
Solution Approach 2:
Different regions of the flexible substrate are assigned different functions and properties: connection contact pads for stable product connections, inspection contact pads with larger area for alignment tolerance, and wire traces for signal transmission. This local differentiation allows each region to be optimized for its specific purpose, improving alignment tolerance without uniformly increasing device complexity
Data Source
AI summary
An electronic apparatus includes: an electronic module; and a flexible substrate electrically connected to the electronic module. The flexible substrate includes: a base film; a plurality of first contact pads arranged at one end on the base film in a first direction, and electrically connected to the electronic module; a plurality of second contact pads arranged at an other end on the base film in the first direction; a plurality of first wires arranged on the base film, and each electrically connecting one of the first contact pads and one of the second contact pads together; and a plurality of third contact pads arranged on the base film, each of the third contact pads being positioned along the first direction between one of the first contact pads and one of the second contact pads, and being electrically connected to one of the first wires.