基于线阵CCD的手机屏幕瑕疵检测器的设计

Design of scratch detector for cell phone screen based on linear array CCD

以改善手机屏幕质量传统人工检测方法的稳定性和可靠性为目的,制作了1款基于线阵CCD的手机屏幕划痕类瑕疵检测器。采用CCD相机和单稳态触发器为核心器件对信号采集、信号处理和功能模块电路进行了设计,可单独提取出划痕信号并将其整形为矩形脉冲。基于此,可以对手机屏幕表面3cm×3cm区域内,宽度≥0.08mm的划痕进行快速识别并报警,并能实现对0～9以内,最小间距达0.5mm的划痕数目进行准确分辨和实时统计。该检测器可应用于手机生产流水线,实现对手机屏幕质量的在线实时、高效检测。

With the purpose of improving stability and reliability in traditional artificial methods of quality detection, scratch detector for cell phone screen is fabricated based on linear array CCD. By employing CCD camera and monostabie flip flop as core components, signal acquisition, signal processing and functional modular circuits are designed. Signal corresponding to scratches is extracted seperately and transformed into rectangular pulses. An alarm is quickly given when scateh with linewidth greater than 0.08 mm is identified on the screen surface within the area of 3 cm ×3 cm. Besides, the number of scatches with minumum spacing of 0.5 mm can be accurately distinguished and instantaneously counted within the range of 0-9. In this case, this detector can be applied in assemhly line of cell phone for realizing on line real-time and high-efficient quality detection of cell phone screen.