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AOI automatic optical detector function selection

Date:2018-01-09

1. The selection of resolutions

The resolution of the AOI automatic optical inspection systems should be based on the size of the pixel as a condition for discrimination; that is, spatial resolution. The size of a pixel is not a criterion for judging the detection capability of an AOI automatic optical inspection system. To be precise, high pixel is a factor that determines the size of a pixel in a unit area. If the unit area is different, there is no significance in making comparison no matter how high the pixels are. For example, if the FOV of an AOI automatic optical inspection system is 12*16mm, and if the AOI uses a 300,000-pixel camera, the resolution of the AOI is only 25 microns. It can only detect components with a package size of 0402 or more. However, if the AOI automatic optical inspection system uses a 2 megapixel camera, then the resolution of this AOI becomes 10 micron, and elements with a package size of 01005 or higher can be detected. Conversely, if the AOI automatic optical inspection system uses a 2 megapixel camera, and if its FOV is 24*32 microns, its resolution is only 20 microns; in this case, although it has a higher pixel, it can only detect elements with the size of 0402 or more. In general, PCBA boards with an element package size of 0402 or above, the AOI automatic optical inspection system is required to have a minimum resolution of 20 μm. For PCBA boards with an element package size of 0201 or above, the required resolution of the AOI automatic optical inspection system must be at least 15 microns. For PCBA boards with an element package size of 01005 or above, the resolution of the AOI must be at least 10 microns.

2. The selection of special features

If you want to test multi-board PCBA, you must choose an AOI automatic optical inspection system with the springboard function; that is, AOI automatic optical inspection systems with the area selection function.

If you use an AOI automatic optical inspection system for quality process control, you must choose an AOI automatic optical inspection systems with RPC function; that is, AOI automatic optical inspection systems with real-time process control.

3.The selection of CAD

Most current AOI automatic optical inspection systems have a CAD data import function, but the use of such a function is not conductive to the efficiency of PCBA boards with fewer components; however, it can produce doubled effect when used for PCBA boards with more components.

In conclusion:

It is evident that the core of the AOI automatic optical inspection systems is software. The Chinese AOI automatic optical inspection system software technology has reached the pinnacle of the world. In this sense, the domestic AOI automatic optical inspection systems have been at the forefront of the world in terms of comprehensive performances; however, there are still some gaps in the manufacturing process as a whole, AOI technology is not yet mature.

TypeInfo: Industry news

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