Flexible Circuit Probe Coupling for Misaligned IC Contacts
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Solution Overview
Problem
Conventional methods for testing integrated circuit devices face challenges due to misalignment and wear of electrical contacts on ceramic substrates during high-temperature processing, leading to inefficient and costly testing processes.
Innovation Solution
A structure comprising a thin film of electrically insulating material with apertures and conductive connections between surfaces, allowing for alignment and connection of probes to misaligned contacts on a product substrate, and a releasable attachment mechanism to extend substrate life and reduce wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional ceramic substrates are used for probe testing, then electrical contacts can be made, but misalignment occurs during high-temperature processing and substrate wear increases
Solution Approach 1:
The invention divides the substrate into two separate components: a ceramic substrate for mechanical support and a separate flexible circuit board for electrical contacts. This segmentation allows each component to perform its optimal function - the ceramic provides thermal stability while the flexible circuit board accommodates alignment variations through flexibility, thereby resolving the contradiction between manufacturing precision and contact reliability.
Solution Approach 2:
The flexible circuit board acts as an intermediary between the probe tips and the ceramic substrate. It provides a compliant interface that can absorb misalignment caused by thermal expansion differences during high-temperature processing, ensuring reliable electrical contact without transmitting stress to the ceramic substrate, thus maintaining both alignment precision and contact reliability.
2Stability of the object's composition
If rigid probe cards are used, then structural stability is maintained, but substrate wear increases and service life decreases
Solution Approach 1:
The invention replaces the rigid probe card structure with a flexible circuit board that can dynamically adapt to misalignment. The flexible nature allows the contacts to conform to position variations without creating excessive contact pressure, reducing wear on the substrate while maintaining structural integrity during the testing process, thereby extending substrate service life while preserving structural stability.
Solution Approach 2:
The flexible circuit board serves as a thin, flexible intermediary layer between the rigid ceramic substrate and probe tips. This flexible film can bend and conform to alignment variations, distributing contact forces more evenly and reducing localized wear on the substrate, thus maintaining structural stability while extending the duration of substrate action.
3Productivity
If electrical contacts are made directly on ceramic substrate, then connection is established, but misalignment during high-temperature processing causes testing failures
Solution Approach 1:
By segmenting the substrate system into ceramic support and flexible circuit board for contacts, the invention allows the flexible board to compensate for thermal expansion misalignment during high-temperature processing. This maintains contact alignment precision without compromising testing efficiency, as the flexible board naturally adapts to position changes.
Solution Approach 2:
The invention changes the physical parameter of the contact layer from rigid to flexible, allowing it to accommodate thermal expansion differences during high-temperature processing. This parameter change enables the contacts to maintain proper alignment despite temperature-induced position shifts, preserving both manufacturing precision and testing productivity.
Data Source
AI summary
An apparatus for testing integrated circuit devices includes a probe device having a plurality of probes, a first substrate including a product substrate having a first surface and an array of electrical contacts disposed on the first surface thereof, and a second substrate disposed between the probes and the first substrate for electrically coupling the probes to corresponding electrical contacts disposed on the first surface of the product substrate.