Accuracy calibration of chip mounter alignment system based on grating

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Accuracy calibration of chip mounter alignment system based on grating

Article | 更新时间：2020-08-12

- Accuracy calibration of chip mounter alignment system based on grating
- Optics and Precision Engineering Vol. 17, Issue 10, Pages: 2425-2430(2009)
- 作者机构：
  
  1. 华中科技大学机械科学与工程学院,湖北武汉,430074
  2. 湖北工业大学机械工程学院
- 作者简介：
- 基金信息：
- DOI：
  CLC： TB92
- Received：14 October 2008，
  
  Revised：13 December 2008，
  
  Published Online：20 October 2009，
  
  Published：20 October 2009
- 稿件说明：
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刘文超,钟毓宁,王选择,谢铁邦. 基于光栅的贴片机对准系统的精度标定[J]. 光学精密工程, 2009,17(10):2425-2430

Accuracy calibration of chip mounter alignment system based on grating[J]. Optics and precision engineering, 2009, 17(10): 2425-2430.
刘文超,钟毓宁,王选择,谢铁邦. 基于光栅的贴片机对准系统的精度标定[J]. 光学精密工程, 2009,17(10):2425-2430 DOI：

Accuracy calibration of chip mounter alignment system based on grating[J]. Optics and precision engineering, 2009, 17(10): 2425-2430. DOI：

摘要

贴片机对准系统的精度标定是视觉定位的关键环节，直接影响贴片精度与贴片质量。传统的标定方法往往需要进行大量的矩阵计算和分析，来确定相机的坐标系与世界坐标系和图像坐标系之间的关系，因此要掌握大量的三维几何知识与投影理论，并且计算繁杂。本文提出的基于光栅的精度标定方法，将光栅图像灰度值之和形成一组周期固定的准正弦信号，通过像元平移把图像条纹灰度值变为李萨如图。通过对李萨如图及其数据进行分析与处理，直接计算出光学系统的分辨率，实现光学系统的精度标定。实验结果表明这种标定方法的精度高，偏差小于0.2微米

精度达到亚微米级，满足贴片机的对准精度要求。

Abstract

Accuracy calibration is the key of high-precision chip mounter vision alignment system

affects the precision and quality of chip mounting. The traditional calibration usually requires a large number of matrix calculation to define the relation of camera coordinate

world coordinate and image coordinate . This paper presents a new calibration method based on grating

a group of data being similar to sinusoid is gotten by calculating the sum of gray-value of pixels in each column. These calculated data are elaborately showed a Lissajous figure by translation for pixel. The size mapping coefficient between the grating groove and their image pixels of the optical alignment system is calculated to realize the accuracy calibration . The result of experiments indicates that the error of the new calibration method is little

it can meet the precision needs of an automatic chip mounter vision alignment system.

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