| Summary: | 碩士 === 雲林科技大學 === 電機工程系碩士班 === 96 === Automatic Optical Inspection (AOI) has become more and more important in industrial automation and manufacture. AOI is a good tool especially in quality control of products. Applications of AOI which have be developed are plenty now, which can be separated into two parts: (1) Defect Inspection, for example: defect inspection of PCB, IC, SMD, etc. (2) Optical Measurement, for example: measurements of electronic components, paper carrier tape for chip-packing, BGA, etc. Automatic inspection which has high stability, high efficiency, and high reliability is the trend of industry.
LM rail is mainly used in linear motion of mechanism, such as the machine for transport, semiconductor equipment, automatic engineering equipment, medical equipment, and LCD equipment, etc. The goal of this thesis is the measurement of one of the main LM rail parts—LM block. An automatic measure system of LM block was developed by C++ in this thesis. In order to achieve the goal of AOI, mechanical, electronic, optical, software, and applied technology must be integrated. Because LM block which will be inspected has the lowest tolerance of 30 micrometers, previous hardware plan plays an important role. The combination of the camera, lens, and illuminant must be perfect to ensure that images which is clear and have high resolution will be captured. When clear images are obtained, post image processing algorithm can reduce complexity very much and improve the inspection speed. After integrating, testing, and adjusting hardware of the system, the measurement will start. Before measuring LM block, a database must be built artificially for the amount of step which X-Y table will move according to the shortest way. After that, every time LM block is measured, X-Y table will move according to the database. After homing, auto-focusing will be done to ensure that images are all clear in order to decrease troublesome image processing later. Then the camera will move to inspecting position to capture images and the uncomplicated and efficient algorithm is used to obtain each position of inspecting point. Finally, the distance from the center of hole to the datum point will be measured and the results will show on the monitor for the operator. In terms of results, proposed measurement method is not only faster than artificial measurement but also satisfying in accuracy.
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