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Article

Title: Machine vision inspects PCB coatings

Author: Yardley, Earl Article Type: Product Analysis
Source: Vision Systems Design, v11 n5 p37(4) Publication Date: May 2006
  ISSN: 1089-3709
  Illustrations: Photographs, Screen Layouts
URL of Publication: http://www.vision-systems-design.com

A United Kingdom-based original equipment manufacturer (OEM) maker of PCB (printed circuit boards) worked with Industrial Vision Systems (IVS), which is a sister company to NeuroCheck, to automate the process of inspection of PCB coatings. IVS designs and manufacturers machine vision systems for automotive, pharmaceutical, printing, and electronic applications. IVS used a standard 1000-mm PCB conveyor system and canopy to allow adaptation to any size board and multiple PCB types. IVS constructed two custom industrial lighting rigs to light both sides of the PCB, and two FWX 14c FireWire cameras from NeuroCheck were mounted above and below the conveyor belt. Digital images were captured with an industrial PC interfaced to the system programmable logic controller (PLC). Three described checks for each PCB are required, and the software can be programmed to establish the correct position and quantity of coating. NeuroCheck Color Matching Wizard is used to compute color level for each coating, and the Distance Mode function of NeuroCheck checks the brightness of a resulting gray-level pixel to indicate similarity to a single reference color when the input is an RGB color image. RGB settings of the camera can be changed on the fly during inspection, and, after inspection of each board, the host PC uses the pass/fail data to launch the Micrologix PLC using a 32-bit digital I/O card from Meilhaus. If a board fails inspection, a reject mechanism can be launched to eject the board from the conveyor for rework.

Special Features: Photographs, Screen Layouts

Products:
FireWire

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