3D曲面玻璃檢測機之設計與系統整合

Abstract

3D曲面玻璃螢幕是近年來科技產業的新風潮，舉凡智慧型手機、電視螢幕與穿戴式電子零件等等，都能看見曲面玻璃的廣泛應用。然而，目前曲面玻璃在生產時之瑕疵規格檢測方法仍未臻成熟，設計開發一套標準化的檢測流程，對於曲面玻璃的品質管理與生產成本控制是非常重要的。 本研究提出一套非接觸式的檢查方法，並搭配應用自動化光學檢測的技術，檢驗入料之3D曲面玻璃螢幕圓角是否符合規格。每片待測玻璃在置放於檢測平台時，先經由輪廓特徵註冊法做位置校正，接著使用彩色共軛焦鏡頭進行掃描，探頭會依據曲面玻璃輪廓的變化，而以不同的傾斜角度量測。座標數據透過雜訊處理以及曲線擬合後，即能迅速地獲得曲面玻璃的倒角尺寸、平面輪廓、玻璃厚度與長寬高規格尺寸。 本研究設計開發之檢測機台，量測重複性可達到30μm，量測時間與三次元量床的接觸式掃描方法相比，可大幅度地減少。測試結果成功地證明此套檢測系統，可更有效地檢驗3D曲面玻璃螢幕之輪廓尺寸與圓角，並提供準確之檢測資訊。

Curved Glass has been widely applied to many electronic devices like mobile phones, TV screens and wearable devices. Investigation into the defect inspection of curved glass is significant for manufacturing process since there are few standard inpection methods.This paper proposes a non-contact inspecting approach with automated optical inspection (AOI) technique to distinguish flawed curved glasses from qualified ones. A contour-based registration method is used to align curved glass on the stage, which is subsequently measured by chromatic confocal microscopy tilted at several angles. The contour of chamering, inclination of surface and thickness are obtained by fitting processed coordinate data. Gauge repeatibility was achieved to 30μm and inspection time was reduced largely compared to that of contact measuring method with coordinate-measuring machine. The testing results demonstrate that the proposed defect detection system can effectively inspect curved glasses with accuracy.