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Ejector devices, methods, drivers, and circuits therefor

  • US 9,539,604 B2
  • Filed: 05/15/2013
  • Issued: 01/10/2017
  • Est. Priority Date: 05/15/2012
  • Status: Active Grant
First Claim
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1. A piezoelectric ejector device for ejecting droplets of fluid, comprising an ejector mechanism including a piezoelectric actuator and a droplet generator plate, and driver electronics for driving the actuator, the electronics including a microcontroller to perform auto-tuning of the ejector mechanism by identifying and setting an optimum spray frequency;

  • wherein auto-tuning involves the generation of at least one cycle of each of a range of drive signal frequencies over a predefined frequency range and obtaining time-energy product (TEP) feedback from a decay signal emitted by the actuator following each frequency generation.

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