Validation of PCB Manufacturing Using Automated Optical Inspection

Creating a printed circuit board is a time-consuming process. Many different points in the manufacturing process must be validated before the board may move on to the next phase, from fabrication to assembly. Manual inspections to advanced X-ray analyses are all options for validating your product. Many automated optical inspection systems used to check PCBs are another standard validation approach.

The AOI machine for PCB is used in a variety of ways to check various production processes during PCB manufacture. Scanning the board saves time by removing the need for operators to inspect all of the little features on each board. Instead, the operators may concentrate on the systems’ flaws, making the inspection process more efficient and reliable. Although AOI systems have been around for a while, many people are unfamiliar with them and have the following questions:

What exactly is it?

For automated comparison, automated optical inspection systems use high-resolution cameras with LED light sources or laser scanners with micron resolution in the X, Y, and Z axes. Which system is utilized is determined by the sort of inspections being performed. Solder paste inspection equipment, for example, will utilize laser scanning to detect the amount of solder on a pad, whereas assembly verification systems will focus on solder component pictures.

What is the mechanism behind it?

Aoi Pcb Inspection is done manually. It will be run through the AOI system after it has been certified to be good in order to establish it as the golden unit for future comparisons. The AOI will “learn” what excellent solder connections look like, as well as the right component values, positions, and orientations on the board, from the golden unit for assembly verification. After storing this data in its database, the system will compare the pictures of newly scanned boards and notify the operators if there are any differences. These systems may be tuned to identify and accept appropriate substitute parts.

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