摘要：焊点质量是影响SMT产品可靠性的关键因素，利用计算机视觉技术对SMT焊点组装质量进行检测，发现组装过程中的焊点质量问题，并予以实时反馈控制，进行组装工艺参数调整或消除故障处理，可有效地提高SMT焊点组装质量。而光源是进行焊点信息采集与检测的最重要部分之一。根据高亮LED的特点，进行了可调高亮的SMT信息采集系统光源的软硬件设计，通过89C51单片机，采用了DAC0832对高亮LED进行驱动点亮，采用按键及中断功能通过程序实现高亮LED进行亮度等级的调节。实验证明，可调高亮LED光源应用与SMT焊点质量信息采集系统中，效果良好，采集图像质量能满足后续的焊点质量信息提取，为后续的研究打下坚实基础。
关键词：焊点质量，信息采集，高亮LED，可调
中图分类号 TN312. 8 文献标识码 A
Design of Tunable High Brightness LED Light Source in SMT Solder Joint Information Collection System
Wu Zhao-hua1, Dai Xuan-jun2
(1. School of Mechanical & Electrical Engineering, Guilin University of Electronic Technology, Guilin 541004, China;
2. Dep. of Electronic & Computer, Guilin University of Technology, Guilin 541004, China)
Abstract: The quality of solder joint is a crucial factor influencing SMT product reliability. In order to improve the quality of SMT solder joint efficiently, the quality of solder joint can be inspected by the application of computer vision technology, then the quality problem of solder joint during the assembly process can be found out and real-time controlled. Then the assembly process parameters can be adjusted and the fault treatment can be carried out. And light source is one of the most important parts during solder joint information collecting and inspecting. According to the characters of high brightness LED, the software and hardware of the tunable high brightness in SMT information collection system light source are developed. The high brightness LED is lit and driven with DAC0832 and 89C51 single chip processor. The grade of high brightness LED can be adjusted by key-press and interrupt function with programme. It is proved by experiment that tunable high brightness LED light source showed good effect by applying in SMT solder joint information collection system. The quality of collecting image satisfies subsequent solder joint quality information extraction, and this high brightness LED light source lays a solid foundation for the following study of SMT solder joint.
Key words: Solder Joint Quality; Information Collection; High Brightness LED; Tunable
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