Detecting Surface Flaws on Storage Disks
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
During the production of disk files, there are a number of occasions when the disks are visually checked for the presence of surface abrasions. This has been done manually in the past, and the effectiveness depends on the operator's vision, concentration and the ambient lighting. The present article proposes performing such visual checks automatically by means of an image-capturing inspection system in which a television camera image of a sector of the disk surface is compared with a reference. The system captures images of successive sectors as the disk is spun, and these are compared with a stored image of the initial sector, which is used as the 'Master' sector for that disk. The proposed automated disk-surface flaw-detection system is shown in the drawing.