A Bayesian Approach to Automated Optical Inspection for Solder Jet Ball Joint Defects in the Head Gimbal Assembly Process

Automation or selective automation is adopted as a solution to most productivity problems in the hard disk drive (HDD) industry as the industry continues to grow at a 40% compounded annual growth rate. An automated production line for manufacturing the head gimbal assembly (HGA) has been developed as part of the automation solution. In the automated HGA production line, a solder jet ball (SJB) soldering station connects the suspension circuit to the slider body. We propose a Bayesian approach to automated optical inspection (AOI) of the SJB joint in the HGA process, implementing Tree Augmented Naïve Bayes Network (TAN-BN) plus check classifier in-situ using GeNIe/SMILE within the inspection software. The system is further enhanced with a result checker, achieving an overall accuracy of 91.52% with 660 production parts in a blind test.

[1]  Lei Yang,et al.  Bayesian Belief Network-based approach for diagnostics and prognostics of semiconductor manufacturing systems , 2012 .

[2]  Jing Li,et al.  Fault detection and isolation of faults in a multivariate process with Bayesian network , 2010 .

[3]  Nir Friedman,et al.  Bayesian Network Classifiers , 1997, Machine Learning.

[4]  Verron Sylvain,et al.  Fault Detection with Bayesian Network , 2008 .

[5]  Fan-Hui Kong,et al.  A New Method of Inspection Based on Shape from Shading , 2008, 2008 Congress on Image and Signal Processing.

[6]  Herbert A. Sturges,et al.  The Choice of a Class Interval , 1926 .

[7]  Franz Pernkopf,et al.  Detection of surface defects on raw steel blocks using Bayesian network classifiers , 2004, Pattern Analysis and Applications.

[8]  Lambert Schomaker,et al.  Variants of the Borda count method for combining ranked classifier hypotheses , 2000 .

[9]  C. N. Liu,et al.  Approximating discrete probability distributions with dependence trees , 1968, IEEE Trans. Inf. Theory.

[10]  Xianmin Zhang,et al.  Feature-Extraction-Based Inspection Algorithm for IC Solder Joints , 2011, IEEE Transactions on Components, Packaging and Manufacturing Technology.

[11]  Horng-Hai Loh,et al.  Printed circuit board inspection using image analysis , 1995, Proceedings IEEE Conference on Industrial Automation and Control Emerging Technology Applications.

[12]  James A. Stori,et al.  A Bayesian network approach to root cause diagnosis of process variations , 2005 .

[13]  P. Spirtes,et al.  An Algorithm for Fast Recovery of Sparse Causal Graphs , 1991 .