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Proceedings Paper

A bi-axial vacuum-packaged piezoelectric MEMS mirror for smart headlights
Author(s): F. Senger; J. Albers; U. Hofmann; G. Piechotta; T. Giese; F. Heinrich; T. von Wantoch; S. Gu-Stoppel
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Paper Abstract

This paper presents a 2D MEMS mirror for smart headlights, combing high-Q vacuum package with AR (Anti Reflecting)-coating, piezoelectric driving and Lissajous scanning. While the vacuum package protects the MEMS device and the AR-coating suppresses parasite reflections from the glass lid, the AlN-based piezoelectric actuators are robust against shock and vibration in harsh environment, comparing to fragile capacitive finger structures. This gimbal-less MEMS mirror with a large circular aperture (diameter = 5.5 mm) utilizes Lissajous scanning possessing two perpendicular torsion modes with frequencies of fx = 2.26 kHz, fy = 2.30 kHz fulfilling high light density and large total optical scanning angles of 55°, 30° at ± 40 VAC. A 2D projection of 50° x 20° was realized, where the angle loss comparing to the 1D testing arose from pincushion distortion, whose effect was severely reduced by the redesign run. Due to the great long-term stability of AlN and protection of vacuum packages, the MEMS mirror also shows a good reliability. This paper will describe and discuss the design, fabrication and characterization results of this MEMS mirror.

Paper Details

Date Published: 28 February 2020
PDF: 7 pages
Proc. SPIE 11293, MOEMS and Miniaturized Systems XIX, 1129305 (28 February 2020); doi: 10.1117/12.2542802
Show Author Affiliations
F. Senger, Fraunhofer Institute for Silicon Technology (Germany)
J. Albers, Fraunhofer Institute for Silicon Technology (Germany)
U. Hofmann, OQmented GmbH (Germany)
G. Piechotta, Fraunhofer Institute for Silicon Technology (Germany)
T. Giese, Fraunhofer Institute for Silicon Technology (Germany)
F. Heinrich, Fraunhofer Institute for Silicon Technology (Germany)
T. von Wantoch, OQmented GmbH (Germany)
S. Gu-Stoppel, Fraunhofer Institute for Silicon Technology (Germany)

Published in SPIE Proceedings Vol. 11293:
MOEMS and Miniaturized Systems XIX
Wibool Piyawattanametha; Yong-Hwa Park; Hans Zappe, Editor(s)

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