A Piezoelectric Actuator with a Motion-decoupling Amplifier for Optical Disk Drives

Title
A Piezoelectric Actuator with a Motion-decoupling Amplifier for Optical Disk Drives
Authors
양우성이승엽유범재
Keywords
Electronics and devices; Instrumentation and measurement; Optics, quantum optics and lasers
Issue Date
2010-06
Publisher
Smart materials & structures
Citation
VOL 19, NO 6, 065027-1-065027-19
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 disk drives or mobile devices. A theoretical modeling and analysis of the PZT actuator including the dynamics of piezoelectric, electrode and substrate layers are performed to estimate the dynamic properties such as natural frequencies, resultant forces and maximum displacements. In particular, we suggest a novel stroke-amplifying structure enabling the decoupled tracking and focusing motions actuated by four parallel multimorphs. A flexure hinge mechanism is used as the displacement amplifier to extend the allowable stroke of the actuator. Experimental results using a cantilever actuator agree well with the analytical predictions. Based on the theoretical and experimental investigations, we have designed the final model of the optical 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 optical disk drives.
URI
http://pubs.kist.re.kr/handle/201004/38594
ISSN
0964-1726
Appears in Collections:
KIST Publication > Article
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