Abstract
This paper presents the linearity between the driving current and the vibration displacement of an axial sliding actuator for a high-density optical head. It also investigated the life of such an actuator. The linearity depends upon the clearance and the contact-force between an aluminum sleeve and teflon-coated axis of 2mm diameter and also the sleeve-roughness. These parameters were investigated to obtain the optimal servo conditions. These are a clearance of about 13μm, contact-force of zero, and the least amount of roughness. The actuator life was confirmed under accelerated-life testing in which the actuator was driven at three times the acceleration of the disk specification. Finally, the life was guessed to be 12, 000 hours under normal driving conditions for high-density optical head.
