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Mechanical and electrical failures and reliability of micro scanning mirrors

: Gaumont, E.; Wolter, A.; Schenk, H.; Georgelin, G.; Schmoger, M.


Thong, J. ; Institute of Electrical and Electronics Engineers -IEEE-, Singapore Section; IEEE Electron Devices Society; IEEE Reliability Society:
International Symposium on the Physical & Failure Analysis of Integrated Circuits 2002. Proceedings : 8 - 12 July 2002, Raffles City Convention Centre, Singapore
New York, NY: IEEE Press, 2002
ISBN: 0-7803-7416-9
S.212-217 : Lit.
International Symposium on the Physical & Failure Analysis of Integrated Circuits <9, 2002, Singapore>
Fraunhofer IMS, Außenstelle Dresden ( IPMS) ()
micromirror; 1D-scanner; reliability; insulation trench; shock resistivity; long run

We present results of failure and reliability investigations on silicon Micro Scanning Mirrors. The electrical insulation resistance, mechanical shock resistance and long-run stability were characterized. By design optimization including a combination of filled and open insulation trenches we achieve an average insulation resistance of more than 10 GÙ at 20 V. The experimental data from devices with an eigenfrequency between 270 Hz and 350 Hz show that they withstand a shock acceleration of more than 6900 g in 3 axes when not operated and of 2500 g at least when operated. This remarkably results are due to several optimized design aspects. In long-run tests with high deflection angles the springs were exposed to a torsional stress of up to 1.5 GPa for more than 1.6×109 periods. No failure or significant change of the eigenfrequency was observed.