February, 2019 Continued from previous page
ponent location on the board pro- vides a much richer data set that can be used for inspection programming purposes. Once we add the default package information with the true manufacturer-specific package data, we have a much more complete rep- resentation of the board as it will be assembled. Comparing the typical PCB foot- print shape with the real package, it
Data preparation applica- tions have been using PCB layout data for many years. Unlocking the real power in these applications
requires the true manufac- turer-specific package data to be added to the set.
becomes clear that this updated data is much more useful within manufac- turing. From an inspection perspec- tive, we not only know the true out- line of the package, but also where the pin contact areas are with respect to the copper pads on the board.
Improving AOI Data Transfer How can this data be used to
reduce the AOI data transfer and programming time? It starts with improved data formats capable of delivering this enriched data to the AOI machines. Two good examples of this are the CyberOptics AOI SRFF format and the Viscom vVision XML format. Both of these formats have the ability to deliver a much richer data content to the machine pro- gramming software. In the cases where inspection
models have not been defined for new components, this data can be used to improve time to match to other mod- els that may already exist in the inspection library. It can also be used to accelerate the creation of new models if no similar ones are avail- able. This rich data set can signifi- cantly reduce programming time from days to hours or from hours to minutes.
Improving AXI Data Transfer This same rich data set can be
used to improve AXI programming time. The Agilent Technologies’ 5DX AXI machine is now sold as the Vitrox AXI machine. The NDF for- mat used by these machines supports separate footprint and package data definitions. Therefore, the bare-
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board footprint data can be delivered to the machine independently of the package data. With both sets of data available
to the programming software, inspec- tion templates can be created, based on the consistent package data, rather than the variations that exist in CAD footprint naming conventions. In this case, accurate PCB and package data is available, but instead of longer times managing algorithms against footprint names, the number of algo- rithms can be reduced with the repeatable data from the manufactur- er-specific packages. The TRI AXI machine can also benefit from reduced programming
times, though in a different fashion. The inspection family and algo- rithms are tied to the part number of the component instead of the foot- print of the bare board. Like manu- facturer package names, the assem- bler’s part number is consistent across designs, making it a more robust vehicle to reduce program- ming time. In the TRI case, the offline pro-
gramming time can be significantly reduced by assigning the family and inspection algorithm through the part number for easy reuse across PCB designs. Instead of spending significant amounts of time assign- ing this data on the machine,
Page 71 Improving PCB Inspection Data Preparation Methods
reusable assignment can be achieved up front in the data preparation soft- ware before the data set is delivered to the machine. Using these simple and effec-
tive methods, manufacturers can reduce programming time for AOI and AXI inspection machines, decreasing downtime and accelerat- ing time to market. Contact: Mentor — A Siemens
Business, 8005 S.W. Boeckman Road, Wilsonville, OR 97070 % 503-685-7000 E-mail:
tessent@mentor.com Web:
www.mentor.com r
See at IPC APEX, Booth 1900
Meeting the increasing demands of electronics manufacturers
Manufacturers are demanding improvements in throughput, yield and performance. Miniaturization and other technical challenges require continuous advancement in manufacturing equipment.
ITW EAE is focused on developing technology that addresses these needs. We have a strong relationship with the world’s leading manufacturers and work directly with them to identify areas that need further innovation. We are actively pursuing the benefits to be realized by
Industry 4.0 and the resulting improvements in yield, overall equipment effectiveness, and lights out factory capabilities envisioned by our collective customers.
Come see all our latest developments at APEX Booth 3339
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