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Proceedings Paper

Two dimensional microscanners with large horizontal-vertical scanning frequency ratio for high-resolution laser projectors
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Paper Abstract

We present two designs of two-dimensional gimbal microscanners with low vertical-scan frequencies of 70 Hz and 330 Hz and a high horizontal scan frequency of 30 kHz. The scanners are fabricated in a 30 μm silicon-on-insulator with backside structures for both mirror and gimbal-frame. The backside structure under the frame increases the frame weight and effectively reduces the resonant frequency of the rotation springs. The slow vertical scan can thus be achieved without reducing the spring width dramatically. A patterned backside structure also reinforces the mirror plate during actuation such that the root-mean-square dynamic deformation of the 1 mm diameter mirror is less than 44 nm (λ/10 for blue) at 10 degrees mechanical scan angle. A microscanner is installed into a prototype laser projector to demonstrate its capability of producing high quality images.

Paper Details

Date Published: 8 February 2008
PDF: 13 pages
Proc. SPIE 6887, MOEMS and Miniaturized Systems VII, 688703 (8 February 2008); doi: 10.1117/12.761617
Show Author Affiliations
Shu-Ting Hsu, Fraunhofer Institute for Photonic Microsystems (Germany)
Thomas Klose, Fraunhofer Institute for Photonic Microsystems (Germany)
Christian Drabe, Fraunhofer Institute for Photonic Microsystems (Germany)
Harald Schenk, Fraunhofer Institute for Photonic Microsystems (Germany)

Published in SPIE Proceedings Vol. 6887:
MOEMS and Miniaturized Systems VII
David L. Dickensheets; Harald Schenk, Editor(s)

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