Micro-actuator with extended analog deflection at low drive voltage

Peter Dürr; Andreas Gehner; Jan Schmidt; Detlef Kunze; Michael Wagner; Hubert Lakner

doi:10.1117/12.645826

23 January 2006 Micro-actuator with extended analog deflection at low drive voltage

Peter Dürr, Andreas Gehner, Jan Schmidt, Detlef Kunze, Michael Wagner, Hubert Lakner

Proceedings Volume 6114, MOEMS Display, Imaging, and Miniaturized Microsystems IV; 61140I (2006) https://doi.org/10.1117/12.645826
Event: MOEMS-MEMS 2006 Micro and Nanofabrication, 2006, San Jose, California, United States

Abstract

Electrostatic Micro-actuators are being increasingly used for a wide variety of applications such as spatial light modulators, scanning mirrors, optical cross connects, micro-valves, and others. Usually the electrical forces operate in one direction and are balanced by a mechanical spring. The resulting deflection is then either defined by a mechanical stop, or it is only a meta-stable equilibrium position: at an additional external force or deflection it will snap to a different position, frequently again defined by a mechanical stop. This issue is well known and is often called 'pull-in'. In the often used parallel-plate capacitor actuator, the instability already begins at a deflection of only on third of the original capacitor plate separation. For safety reasons and due to the steep response-curve one can only use an even smaller fraction of the mechanically possible movement. This means, that the gap below the actuator has to be designed very much larger than the required maximum deflection. To get the pre-described force and deflection, a much higher voltage is needed than for potential smaller gap widths. The useable range of deflection for many types of micro-actuators can be extended without the penalty of large drive voltage or low shock resistivity, by employing springs with steeper-than-linear restoring force. Alternatively, the voltage needed for a given range of deflection may be reduced. This paper shows the benefits and how to design and dimension these types of springs.

Citation Download Citation

Peter Dürr, Andreas Gehner, Jan Schmidt, Detlef Kunze, Michael Wagner, and Hubert Lakner "Micro-actuator with extended analog deflection at low drive voltage", Proc. SPIE 6114, MOEMS Display, Imaging, and Miniaturized Microsystems IV, 61140I (23 January 2006); https://doi.org/10.1117/12.645826

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available