The
PCB Group

Automated Optical Inspection

Automated Optical Inspection (AOI) has contributed significantly, since its introduction in to the Printed Circuit Board (PCB) manufacturing process, by improving production yields, tolerances and overall product quality.

AOI is used for intermediate process inspection and is primarily used to inspect the etch pattern of individual copper layers. The systems compares the actual etch pattern against the primary gerber data and can detect variations of track thickness down to 38um (1.5) Mil as well as detecting etching defects such as compromised tracks which would otherwise still pass all electrical connectivity checking.

To the customer, the technology ensures not only electrical conformity of the PCB product but also tolerance conformity of tracks clearances and thickness. To our manufacturing line, it means non conformity can be detected early on in the manufacturing process, enabling the manufacturing process to be constantly fine tuned. It also brings the advantage that defects can be detected as they occur, eliminating the cost of having to finish the product and then only detecting the problem during the final Bare Board Testing (BBT) process.

In applications where impedance control is required AOI is essential in ensuring product conformity

Conclusion:
AOI reduces product defects, improves yield rates and ensures tolerance conformity of tracks and clearances. It enables us to supply higher quality products at a reduced production cost.

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