UNDERSTANDING 3D AOL What It Is, and What It Isn't

摘要

3D inspection has become a buzzword in the industry, but neither the meaning nor the definition of three-dimensional inspection has been standardized. What is behind the buzzword, and what are the different approaches currently offered to electronics manufacturers?A number of systems and vendors have successfully used 3D measurement for years, but predominantly in the form of solder paste inspection (SPI) or, more correctly, solder paste measurement. It is necessary to differentiate between measurement and inspection, since 3D systems actually measure the solder paste volume deposited on the individual pads. Deploying different measurement technologies such as laser triangulation or phase shift profilometry achieves reasonably good results in performing 3D volumetric measurement, but the task is relatively simple: simply measuring bricks of dull, grey solder paste.