Abstract
In this paper, an optical pick-up actuator is studied using a multilayered PZT(lead–zirconate–titanate) for possible application to slim and small-form-factor optical diskdrives or mobile devices. A theoretical modeling and analysis of the PZT actuator includingthe dynamics of piezoelectric, electrode and substrate layers are performed toestimate the dynamic properties such as natural frequencies, resultant forcesand maximum displacements. In particular, we suggest a novel stroke-amplifyingstructure enabling the decoupled tracking and focusing motions actuated by fourparallel multimorphs. A flexure hinge mechanism is used as the displacementamplifier to extend the allowable stroke of the actuator. Experimental results usinga cantilever actuator agree well with the analytical predictions. Based on thetheoretical and experimental investigations, we have designed the final model of theoptical pick-up actuator with a height of 2.5 mm, showing that the moving range is ± 400 µm at 15 V in the focusing direction, which is appropriate for slim or small-form-factor opticaldisk drives.
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