Abstract
The aim of this study is to use digital image analysis to inspect Hard-Disk surface scratches. Hard-Disk surface is usually polished after electroplated. Abrasive particles and other materials are the main cause of the scratches on hard-disk surface during the polishing process. After polishing, hard-disk surface scratches needs to be inspected. To avoid any further loss, defects in the former process should be tracked, regulated and after all, corrected. Scratch characteristics (ex: direction, size, and depth etc.) will greatly affect the inspection done by digital image. The direction to get the image, the angle of the light, and several other variables would also have effects on the inspection. This study is to discuss the effect of these different parameters and set up the best inspection parameters according to the result. The result of this study is as the following. Inspection in diffusion is better than in mapping. The larger the estimated average angle of the scratch is, the better the inspection would be. The inspection get to the best when the angle of light source is set at 80 degrees, the angle to get the image at 90 degrees, and the angle to get the image of the object at 270 degrees. Inspections being done in high resolution get better result than it is done in low resolution. Using upward parameters in inspection for hard-disk surface scratches leads to better results, too.