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Micro Snap-Fits for Latching 3D MEMS Assemblies

[+] Author Affiliations
N. S. Shaar, G. Barbastathis, C. Livermore

Massachusetts Institute of Technology, Cambridge, MA

Paper No. IMECE2010-38948, pp. 209-212; 4 pages
doi:10.1115/IMECE2010-38948
From:
  • ASME 2010 International Mechanical Engineering Congress and Exposition
  • Volume 10: Micro and Nano Systems
  • Vancouver, British Columbia, Canada, November 12–18, 2010
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4447-2
  • Copyright © 2010 by ASME

abstract

This paper reports the design, fabrication and demonstration of micro-scale mechanical latches (micro snap-fits) for assembling 3D micro-structures from 2D patterned precursors. The latches consist of pairs of pointy arrowhead-like features mounted on cantilevers, on one membrane, and corresponding slits in the mating membrane. As the membranes are pushed together, the cantilevers bend elastically and squeeze the arrowhead tips through the slits to latch onto the back side of the mating membrane. The latches are reversible, enabling reconfigurable assembly. They are also designed to have no backlash, enabling precise positioning of the assembled structures. An analytical model of the latches was used to design the profile of the arrowheads subject to the geometrical constraints imposed by the alignment system. The micro snap-fits were demonstrated by assembling a corner-cube from two folded flat panels with the substrate serving as the third side.

Copyright © 2010 by ASME

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