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Micromachined acoustic-wave liquid ejector

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2 Author(s)
Dai Huang ; Dept. of Electr. Eng., Hawaii Univ., Honolulu, HI, USA ; Eun Sok Kim

This paper describes the design and performance of micromachined, self-focusing acoustic-wave liquid ejector (AWLE) that requires no heat, nozzle, nor acoustic lens. The AWLE has a very simple device structure and is easy to fabricate. Three versions of AWLE have been designed, fabricated, and tested for an ink-jet printing application. Also developed are computer simulation and design aids that take into account the acoustic loss in water and the two-time wave reflections at the water-air and water-transducer interfaces. The AWLE has been observed to eject water droplets of about 5 μm in diameter with radio frequency (RF) pulses of 5 μs pulsewidth. Overall, the AWLE has been shown to be capable of improving the printing resolution and speed of ink-jet printing significantly

Published in:

Microelectromechanical Systems, Journal of  (Volume:10 ,  Issue: 3 )