Automated 2D Stiction and Head-Crash Camera
Original Publication Date: 1989-Mar-01
Included in the Prior Art Database: 2005-Jan-27
A non-contact optical system is described by which mechanical movements such as head stiction or a head crash, can be continuously monitored from the beginning of the phenomenon. The optical system (Fig. 1) comprises a white light source 1 which illuminates the surface of the disk 2, and the reflected light is captured by an optical charge-coupled device (CCD) camera 3 which includes an array of photo-diodes. A voltage output is produced which is directly proportional to the intensity of the reflected light. (Image Omitted) The specific embodiment of the system shown in Fig. 2 is adapted for capturing a wear track before and after a head crash. In this case a 1D arrangement of photo-diodes 4 is sufficient to capture the light image.