Solar, HDI light up inspection
By Ann R. Thryft, Contributing Technical Editor -- Test & Measurement World, 6/1/2009 2:00:00 AM
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Two bright spots in machine vision these days are the rise of solar-cell inspection, and the inspection of HDI (high-density interconnect) boards and their complex component packages.
As was evident at the Vision Show in Phoenix (March 31 to April 2), solar-cell manufacturers need machine vision in both front-end and back-end processes. And to produce higher volumes, drive down product costs, and increase yields, makers of photovoltaic solar cells based on silicon wafers are turning to the high-speed, high-volume manufacturing and inspection the semiconductor industry is known for, leveraging technologies and processes originally developed for semiconductors ("Machine vision aids solar-cell inspection").
Although the general economy is beginning to show signs of picking up, the machine-vision industry is still undergoing trying times, as indicated by shakeups among some manufacturers of AOI (automated optical inspection) and AXI (automated x-ray inspection) equipment. But as board interconnect and IC packages get denser and more features like passives are embedded in substrates, OEM and EMS customers need x-ray technology to see inside and under these complex structures. 3-D technology is becoming more important for electronic inspection to ensure that solder balls in ball-grid array components are shaped correctly, which can’t be determined using 2-D techniques ("AOI and AXI business contracts, machines improve").
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