Finding opens with optics

Abstract

As circuit densities continue their increase, Automated Optical Inspection (AOI) augments traditional test methods for assuring quality of electronic assemblies. AOI is particularly helpful in assembly lines where both sides of a board are reflowed. This most modern style of construction leads to products of unprecedented density, but also brings us difficulties with in-circuit fixturing. The loss of in-circuit fixturing has the potential to bring us products of greater cost and inferior quality. AOI offerings exist for several process steps, but by far the largest use of AOI is after solder reflow. AOI cannot eliminate all in-circuit test, but often fills the gaps left by the access deficit. AOI is also combined with flying probers and with functional testers. It is automated, and it is in the process. This is the runway on which AOI technology is gathering speed for takeoff, ultimately to become the primary choice for manufacturing inspection.