Dual-Side IC Substrate Inspection Without Flipping Damage
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Solution Overview
Problem
Conventional inspection techniques are inadequate for handling integrated circuit substrates with structures built on both sides, as they require flipping the substrate for inspection, leading to potential contamination and damage, and can only be used after copper etching, limiting inspection to a single side at a time.
Innovation Solution
An inspection system that holds the substrate using specified keep out zones (KOZs) and employs sensors on both sides for simultaneous inspection, allowing inspection before copper etching and reducing the risk of contamination or damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional inspection techniques are used to inspect both sides of the substrate, then inspection coverage is improved, but the substrate is subjected to flipping which causes contamination and damage
Solution Approach 1:
The patent transitions from sequential single-sided inspection to simultaneous dual-sided inspection by adding inspection capabilities in the vertical dimension. Multiple inspection cameras are positioned to inspect both front and back sides of the substrate concurrently, eliminating the need to flip the substrate and thereby preventing contamination and damage while maintaining complete inspection coverage
Solution Approach 2:
The patent combines multiple inspection operations into a single simultaneous process. Both sides of the substrate are inspected at the same time using coordinated camera systems, merging what were previously separate sequential operations into one integrated inspection event that eliminates handling steps
2Reliability
If inspection is performed after copper etching, then the substrate can be handled safely, but inspection timing is delayed limiting defect detection opportunities
Solution Approach 1:
The patent performs inspection at intermediate processing stages before copper etching is complete, conducting preliminary inspections that detect defects early in the manufacturing process. Multiple inspection points are established at different stages of copper layer formation, allowing defect detection before final etching while maintaining handling safety through controlled substrate support
3Loss of information
If the substrate is flipped for inspection, then both sides can be examined, but throughput is reduced due to sequential processing
Solution Approach 1:
The patent merges front-side and back-side inspection operations into a single simultaneous process. By positioning inspection cameras to capture images of both substrate sides at the same time, the system eliminates the sequential flip-and-reinspect workflow, thereby doubling inspection throughput while maintaining complete examination of both surfaces
Solution Approach 2:
The patent enables continuous simultaneous inspection of both substrate sides without interruption for flipping or repositioning. The coordinated camera systems operate continuously on both faces of the moving substrate, eliminating idle time and maintaining uninterrupted inspection flow that maximizes productivity
Data Source
AI summary
An inspection system for capturing information from substrate using one or more sensors. In some instances, a substrate can be simultaneously inspected on both sides at the same time. In other embodiments, various measurements can be performed on the overlay, features, thickness, resistance, and other parameters. These measurements can be made with various sensors such as cameras, lasers, infrared imaging, and/or x-ray sensors. The inspection system by handling the substrate carefully can avoid damage or contamination to the substrate while inspecting the substrate during stages of the process that are currently not inspected due to the downsides of conventional inspection machinery.