Research of Mobile Panel Thickness and Defects Inspection
Date Issued
2011
Date
2011
Author(s)
Maung, Kyaw-Kyaw
Abstract
This research aims to develop a multi-function for mobile phone panel automated inspection systems. It is different from the standard system which can only identify surface defects and not for thickness defects. So, this system in combination with a DVD focus probe module and use focus probe to measurement the mobile panel thickness. Adopted a commercial DVD pickup head as the sensor, and focusing by astigmatic method. Using the linear region of the focus error signal curve between the voltage and displacement relationship was measured. And get the panel thickness by linear displacement.
In the image acquisition process, the front-lighting and back-lighting are taken from the same station. The main of back-lighting images was detection for holes; front-lighting image may divide into the coating area and the transparent area. The coating area mainly has the scratch and edge defect. The transparent area mainly has the oil stain and stripe defect. It is can define a characteristic by binarization, filtering, morphological processing, automatic analysis and other method for defects, and classify the defects.
Subjects
mobile panel
thickness
defect inspection
Type
thesis
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