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机器视觉检测在PCB板检测领域的应用

时间:2018-04-17  来源:本文搜集于网络,由机器视觉检测厂家创盈时代整理,欢迎转载,转载注明出处  点击:249

为了保证PCB板的生产质量,厂家在生产的过程中必须经过严格的检测,每个厂家的检测方法也不尽一样,检测方法都会针对不同的PCB板的瑕疵。按照检测大类来说主要可分为电气检测法和机器视觉检测两大类。
In order to ensure the production quality of PCB board, the manufacturer must undergo strict inspection in the process of production. The testing methods of each manufacturer are not the same, and the detection methods will be aimed at the defects of different PCB boards. According to the detection class, it can be divided into two main categories: electrical detection and machine vision detection.

电气测试通常采用电桥测量各测试点间的阻抗特性的方法,来检测所有通导性,即开路和短路。机器视觉检测是测试通过视觉检查电子元器件的特征以及印刷线路的特征找出缺陷。电气测试在寻找短路或断路瑕疵时比较准确,而机器视觉检测可以更容易侦测到导体间不正确空隙的问题,并且机器视觉检测一般在生产过程的早期阶段进行,可以尽量找出缺陷并进行返修,以保证最高的产品合格率。

Electrical tests usually use electric bridge to measure impedance characteristics between test points to detect all conductivity, namely open circuit and short circuit. Machine vision inspection is to detect defects through visual inspection of the characteristics of electronic components and the characteristics of printed circuit. Electrical testing is more accurate in finding short circuits or circuit breakers, and machine vision detection can detect the incorrect gap between conductors more easily, and machine vision inspection is usually carried out at the early stage of the production process, and the defects can be found and rebuilt to ensure the highest product qualification rate.


机器视觉检测设备


PCB板常用的两种检测方法介绍:
Two detection methods commonly used in PCB board are introduced.

1、人工目测:使用放大镜或校准的显微镜,利用操作人员视觉检查来确定电路板合不合格,并确定什么时候需进行校正操作,它是最传统的检测方法。它的主 要优点是低的预先成本和没有测试夹具,而它的主要缺点是人的主观误差、长期成本较高、不连续的缺陷发觉、数据收集困难等。目前由于PCB的产量增 加,PCB上导线间距与元件体积的缩小,这个方法变得越来越不可行。
1, manual visual testing: using a magnifying glass or calibrated microscope, using the visual inspection of the operator to determine the disqualification of the circuit board, and determine when the correction operation is required, it is the most traditional method of detection. Its main advantages are low pre cost and no test fixture, and its main shortcomings are human subjective error, high long-term cost, discontinuous defect detection, data collection difficulty and so on. At present, because of the increase of PCB output and the reduction of conductor spacing and component volume on PCB, this method is becoming more and more infeasible.

2、自动光学检测,也称为自动机器视觉检测,是基于光学原理,综合采用图像分析、计算机和自动控制等多种技术,对生产中遇到的缺陷进行检测和处理,是较新 的确认制造缺陷的方法。AOI通常在回流前后、电气测试之前使用,提高电气处理或功能测试阶段的合格率,此时纠正缺陷的成本远远低于最终测试之后进行的成本常达到十几倍。
2. Automatic optical detection, also known as automatic vision detection, is based on optical principle. It is a new method to detect and deal with defects in production by using various techniques such as image analysis, computer and automatic control. AOI is usually used before and after reflux and before electrical testing to improve the qualification rate of electrical or functional testing. At this time, the cost of correcting the defects is much lower than the cost of the final test.
    
深圳市创盈时代科技有限公司是一家专注于机器视觉,视觉检测设备,CCD光学检测设备,机器视觉检测,视觉方案定制,非标自动化设备的研发生产和销售于一体的国家高新技术企业。

原文地址:http://www.chytime-ccd.com/zhishi/296.html

本文关键字:机器视觉检测 PCB板检测

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