TEMPLATE BASED DEFECT DETECTION OF FLEXIBLE PRINTED CIRCUIT

2015 ◽  
Vol 78 (1) ◽  
Author(s):  
Zuliani Zulkoffli ◽  
Elmi Abu Bakar
Keyword(s):  
Machine Vision ◽  
Processing Time ◽  
Short Circuit ◽  
Processing System ◽  
Inspection Time ◽  
Printed Circuit ◽  
Vision Inspection ◽  
Inspection Process ◽  
Flexible Printed Circuit ◽  
Circuit Defects

This study presented a research on machine vision inspection to define defects on flexible printed circuit (FPC). The images were subjected to image processing system where an elimination-subtraction method used. In this algorithm, 7 types of FPC defects defined and simulated in the system using Specimen 1 and processing time taken for both side inspection was 3.3s. Then, the commercial patent design of FPC was tested as specimen 2 to define short circuit defects on it. The processing time taken by this algorithm on specimen 2 was 0.28s. Comparison on manual inspection and machine vision implementation were carried out and greatly resulted on shorten inspection time to 59.7%. This result shows significant contribution in increasing the efficiency of FPC inspection process. 

scholarly journals Case Study: An Improvement of Inspection Approach of Printed Multilayer Circuit Products Related to Visual Based Inspection Technique

2020 ◽  
Vol 16 (2) ◽  
pp. 1-34
Author(s):  
Yap Wan Yee ◽  
Mohammad Nishat Akhtar ◽  
Elmi Abu Bakar
Keyword(s):  
Product Quality ◽  
Manufacturing Industry ◽  
Printed Circuit Board ◽  
Circuit Board ◽  
Inspection Time ◽  
Productivity Analysis ◽  
Flow Process ◽  
Inspection Method ◽  
Inspection Process ◽  
Flexible Printed Circuit

Product quality is an important issue in all manufacturing industry nowadays to meet the customers’ requirement. In this regard, most of the factory has a special department namely Quality Control (QC) Department which control the product quality. The studied factory is a flexible printed circuit board manufacturer which is located in Bayan Lepas, Pulau Pinang, Malaysia. QC Department of the studied factory has high amount of work-in-progress (WIP). Therefore, the products have to be sent out to subcontractors for quality inspection. However, this method is not economically effective. Hence, the objective of this study was to develop an improved inspection method which will reduce the overall inspection time of the current inspection method (CIM). By reducing the inspection time, productivity of the department will increase and subsequently reduce the amount of WIP. This study is focused on the improvement of one product only. Before the improved inspection method (IIM) of the selected product was developed, performance of the CIM was evaluated by using one of the graphical productivity analysis charting techniques which is flow process chart. It was found that the IIM was able to reduce the inspection time of whole inspection process by 85.06 sec for every 12 panels inspected.

scholarly journals Cotton Gin Stand Machine-Vision Inspection and Removal System for Plastic Contamination: Software Design

2021 ◽  
Vol 3 (3) ◽  
pp. 494-518
Author(s):  
Mathew G. Pelletier ◽  
Greg A. Holt ◽  
John D. Wanjura
Keyword(s):  
Machine Vision ◽  
Software Design ◽  
Low Cost ◽  
Processing System ◽  
Cotton Lint ◽  
Cotton Industry ◽  
Vision Inspection ◽  
Machine Vision Inspection ◽  
Vision Detection ◽  
Removal System

The removal of plastic contamination from cotton lint is an issue of top priority to the U.S. cotton industry. One of the main sources of plastic contamination showing up in marketable cotton bales is plastic used to wrap cotton modules produced by John Deere round module harvesters. Despite diligent efforts by cotton ginning personnel to remove all plastic encountered during module unwrapping, plastic still finds a way into the cotton gin’s processing system. To help mitigate plastic contamination at the gin, a machine-vision detection and removal system was developed that utilizes low-cost color cameras to see plastic coming down the gin-stand feeder apron, which upon detection, blows plastic out of the cotton stream to prevent contamination. This paper presents the software design of this inspection and removal system. The system was tested throughout the entire 2019 cotton ginning season at two commercial cotton gins and at one gin in the 2018 ginning season. The focus of this report is to describe the software design and discuss relevant issues that influenced the design of the software.

scholarly journals Research on Dimensional Inspection System of Thin Sheet Part Based on Machine Vision

2011 ◽  
Vol 2-3 ◽  
pp. 469-474
Author(s):  
Ji Gang Wu ◽  
Xue Jun Li ◽  
Bin Qin
Keyword(s):  
Machine Vision ◽  
Edge Detection ◽  
Spline Interpolation ◽  
Thin Sheet ◽  
Optimization Method ◽  
Inspection Time ◽  
Inspection System ◽  
Adaptive Optimization ◽  
Dimensional Inspection ◽  
Vision Inspection

Key technologies of dimensional inspection system of thin sheet part based on machine vision are investigated, and an entire machine vision inspection system is developed. A cad information-based line scanning step adaptive optimization method used for image grabbing of inspected part is proposed. A rectangle lens subpixel edge detection method based on cubic spline interpolation used for edge detection is advanced. A planar contour primitive recognition method based on curvature and HOUGH transform used for image recognition is raised. The inspection accuracy of the inspection system can reach to 1μm, and the inspection time can satisfy the requirements of on-line real-time inspection, so the inspection system is feasible.

Fatigue Behavior of Thin Cu Foils for Flexible Printed Circuit Board

2007 ◽  
Vol 124-126 ◽  
pp. 1369-1372 ◽  
Author(s):  
Seung Woo Han ◽  
Ki Jeong Seo ◽  
Wan Doo Kim ◽  
Hak Joo Lee ◽  
Hyun Woo Lee ◽  
...  
Keyword(s):  
Thin Film ◽  
Printed Circuit Board ◽  
Fatigue Behavior ◽  
Fatigue Cracks ◽  
Short Circuit ◽  
Circuit Board ◽  
Fatigue Properties ◽  
Printed Circuit ◽  
Flexible Printed Circuit ◽  
Flexible Pcb

Flexible printed circuit board (PCB), which is used for folder and slide type cellular phones, consists of flexible copper clad laminate (FCCL) and cover layer. Through it an electric current is applied to liquid crystal display (LCD) from the main board of cellular phone. In thin Cu foils of flexible PCB fatigue cracks due to repeated bending motion generate and propagate, and they cause a short circuit. Fatigue behavior of thin Cu foils being used for flexible PCB must be evaluated and confirmed to resolve this problem. It is based on findings by several researches that the mechanical properties of thin film materials differ from those of their bulk counterparts. Thin film properties have been investigated over the last years; however fatigue behavior of thin films has not yet been studied as thoroughly as monotonic behavior. In this study fatigue properties of thin Cu foils for the application in flexible PCB are obtained. Fatigue testing was performed for two kinds of Cu foils that were made by rolling and electrochemical procedures respectively. Differences of fabrications in fatigue behavior of thin foils were distinguished. Especially for rolled Cu foils, effects of rolling directions in fatigue properties were evaluated.

Improving Quality Control Plan of Flexible Printed Circuit

2015 ◽  
Vol 789-790 ◽  
pp. 1264-1269
Author(s):  
Ratchapon Nunthaporm ◽  
Parames Chutima
Keyword(s):  
Quality Control ◽  
Smart Phone ◽  
Statistical Process ◽  
Inspection Method ◽  
Control Plan ◽  
Printed Circuit ◽  
Process Failure ◽  
Inspection Process ◽  
Flexible Printed Circuit ◽  
Business Competitiveness

Smart phone market has been growing larger and larger in recent years. This fact makes enormous competitiveness in its supply chain. Therefore, the product quality is the most importance part to improve business competitiveness, especially a flexible printed circuit which is a main assembly component in smart phones. This paper presents the approach to improve the quality control plan of the flexible printed circuit backend process. Failure Mode Effective Analysis (FMEA) was adopted to prioritize the defective and analyze weak points in the original quality control plan. Then, Statistical Process Control (SPC), optimizing inspection method and working procedure of inspection process, were introduced to improve the detection ability of the quality control plan. The results showed that the implementation of the new quality control plan could reduce escaped defective parts and the expense of escaped defect parts significantly.

scholarly journals Flexible Printed Circuit Board as Novel Electrodes for Acoustofluidic Devices

2020 ◽  
pp. 1-6
Author(s):  
Chao Sun ◽  
Roman Mikhaylov ◽  
Yongqing Fu ◽  
Fangda Wu ◽  
Hanlin Wang ◽  
...  
Keyword(s):  
Printed Circuit Board ◽  
Circuit Board ◽  
Printed Circuit ◽  
Flexible Printed Circuit
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