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Title: Piezoelectric dispenser based on a piezoelectric-metal-cavity actuator
Authors: Lam, KH
Sun, C
Kwok, KW 
Chan, HLW 
Keywords: Piezoceramicsors
Piezoelectric actuators
Issue Date: Jul-2009
Publisher: American Institute of Physics
Source: Review of scientific instruments, July 2009, v. 80, no. 7, 075110, p. 1-3 How to cite?
Journal: Review of scientific instruments 
Abstract: A piezoelectric dispenser has been fabricated based on the idea of a piezoelectric-metal-cavity (PMC) actuator. The PMC actuator consists of a metal ring sandwiched between two identical piezoelectric unimorphs. The radial contraction of the piezoelectric ceramic is converted into a flextensional motion of the unimorph, causing a large flexural displacement in the center part of the actuator. With the PMC actuator as a fluid chamber, the large flexural actuation can be used to produce the displacement needed to eject fluid. By applying an appropriate voltage to the piezoelectric unimorphs, a drop-on-demand ejection of ink or water can be achieved. The efficiency of fluid ejection can be enhanced after installing a valve in the fluid chamber. With the simple PMC structure, the dispenser can be operated with a low driving voltage of 12–15 V.
ISSN: 0034-6748 (print)
1089-7623 (online)
DOI: 10.1063/1.3187220
Rights: © 2009 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in K.H. Lam et al., Rev. Sci. Instrum. 80, 075110 (2009) and may be found at
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