标题: 表面黏着型发光二极体瑕疵检测系统之研究
Automated Inspection System For SMD LED Defects
作者: 刘晓薇
Liu, Hsiao-Wei
彭德保
Perng, Der-Baau
工业工程与管理学系
关键字: SMD LED;电脑视觉;自动光学检测;瑕疵检测;SMD LED;machine vision;automated optical inspection;defect inspection
公开日期: 2011
摘要: 近年来,表面黏着型(Surface-Mounted Device,SMD)发光二极体(Light Emitting Diode,LED)已被大量生产并应用于背光模组光源,但SMD LED封装厂生产制造后仍以人工目视检测可能产生之六项瑕疵,包含缺件(Missing Component)、侧翻(Wrong Orientation)、极性反(Inverse Polarity)、缺口(Mouse Bite)、金线不良(Gold Wire Missing),以及表面不良(Surface Defect)等。本研究研发出一套SMD LED瑕疵自动光学检测系统,此系统包含硬体机构与检测演算法。硬体光学取像机构安装于卷带包装机上,可撷取并收集卷带上三种类型LED影像。检测演算法对收集之影像先进行影像前处理与旋转校正。接着,使用检测区域自动产生法(Inspection Regions Auto-Generation Method)切割各LED的检测区域。针对切割出的检测区域撷取其特征值,并由所提出之方法进行检测与瑕疵分析。透过本研究所开发之检测系统,实验结果显示平均检测率高达97%,单张LED影像检测时间小于0.25秒。可正确且快速地检测不同类型的LED瑕疵,并提高SMD LED产品之品质检测成效。
Surface-mounted device (SMD) light emitting diodes (LEDs) are used in many different applications. However, some LED defects are unavoidable in large-volume fabrication and taping processes. These defects may include missing components, wrong orientation, inverse polarity, mouse bite, gold wire missing, and surface defect. To inspect the defects, LED packaging factories still rely on human inspector that leads to high cost, time consuming, and lack of consistent inspection results. This dissertation is to design and develop a defect inspection system for the three types of LEDs. The proposed system includes the software system that is to inspect the mentioned defects and hardware system that is used to capture the on-line images. Image preprocessing and normalization are firstly applied to the on-line images. The proposed inspection regions (IRs) auto-generation method is then used to segment the IRs of the three types of LED images. The inherent features on the IRs are extracted to inspect corresponding defects. Experimentations reveal that the successful inspection rate is up to 97% and the inspection time of per LED image is less than 0.25 second. The contribution is that the proposed method could provide reliable and effective inspection results of the three types of LEDs.
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT079633542
http://hdl.handle.net/11536/42899
显示于类别:Thesis