光编码器组装与评估之自动光学检测装置及其方法;AUTOMATIC OPTICAL INSPECTION DEVICE AND METHOD FOR THE ASSEMBLY AND EVALUATION OF THE OPTICAL ENCODER

摘要

本发明为一种光编码器之组装与评估之自动光学检测装置及其方法，在检测系统架构方面，光栅主尺主要透过XY精密移动平台移动，利用CCD摄影机能将双光栅之间移动产生的明暗变化给记录下来，使用演算法去除图像杂讯与去除背景撷取影像关键资讯及检测影像光场之均匀度。透过叠纹侦测手段，可将副尺固定于机构上与CCD保持垂直在以得到正确之亮度分布。传统线性编码器之输出信号主要透过电路之滤波、放大、整流等方式来得到一完整输出之正弦讯号波型。本发明藉由机器视觉与影像处理方式可准确量测输出信号之波型，同时可针对杂讯与非均匀性做一较好的处理，提高讯号的品质。 The present invention relates to an automatic optical inspection device and method for the assembly and evaluation of the optical encoder. The variation of brightness can be detected and recorded by CCD camera while grating move, using image noise depression, background separation, fringe calculation with new image processing algorithms. In the side of architecture of detection system, the reference grating is fixed on the structure to maintain the correct optical intensity distributions with the main grating is driven by the XY Precision platform and moiré