Abstract
Recently, there has been a trend to lower the tilt margin in multifunctional rewritable optical disk drives and many attempts have been made to construct a servo system to compensate the tilt in such devices as compact disk-rewritable (CD-RW) or digital versatile disk-random access memory (DVD-RAM) drives in view of rewritable disks. However, in the slim-type drives for Notebook PCs, it is very difficult to realize mechanisms for tilt servo without accompanying impairment of the gain property, due to spatial constraints. In this paper, we suggest a method of controlling the driving force to diminish the variance of mechanical tilt over the entire movable range of wire-spring-suspension-type actuators, and propose a process for precise analysis of driving force. In addition, based on the results of force analysis, we present the conditions that minimize the phase disturbance in subsidiary resonances which have adverse effects on the servo performance of slim-type pickup actuators.
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