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Proceedings Paper

Design optimization of an electrostatically driven micro scanning mirror
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Paper Abstract

A design optimization of the electrostatically driven 1D Micro Scanning Mirror developed at the Fraunhofer Institute of Microelectronical Circuits and Systems has been carried out. The improvements are based on the use of non-Manhattan shaped structures for the mirror plate and the driving electrode combs. Several new design variants have been fabricated, characterized and are compared with devices of the previous design comprising quadratic mirror plates. The advantage of lower inertial moment favors the circular and elliptic design of the mirror plate. The capacity variation has been increased significantly by a special arrangement of the driving electrode fingers. Especially, a comb with star shaped fingers allows us to enhance the capacity variation remarkably. The experimental characterization of the devices shows that the elliptic plate with star shaped electrode combs is the variant to favor when the application requires large deflection angles for a given driving voltage and characteristic frequency. This meets the theoretical based expectation although the experimentally determined damping factor of devices with this design is significantly larger than for design variants with elliptic mirror plate and parallel electrode fingers. Devices of the novel design achieve mechanical deflection angles of up to +/- 14.0 degree(s) at a driving voltage of 11 V at low oscillation frequency. In comparison to the previous design this is an increase of 35 %.

Paper Details

Date Published: 2 October 2001
PDF: 10 pages
Proc. SPIE 4561, MOEMS and Miniaturized Systems II, (2 October 2001); doi: 10.1117/12.443106
Show Author Affiliations
Harald Schenk, Fraunhofer-Institut fuer Mikroelektronische Schaltungen und Systeme (Germany)
Alexander Wolter, Fraunhofer-Institut fuer Mikroelektronische Schaltungen und Systeme (Germany)
Hubert K. Lakner, Fraunhofer-Institut fuer Mikroelektronische Schaltungen und Systeme (Germany)

Published in SPIE Proceedings Vol. 4561:
MOEMS and Miniaturized Systems II
M. Edward Motamedi; Rolf Goering, Editor(s)

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