| Summary: | 碩士 === 國立中央大學 === 光機電工程研究所 === 98 === Ultrasound-focusing ejection is an inkjet technology that uses ultrasound focusing lens to focus the ultrasonic energy in liquid surface and further eject droplets. Because the ultrasound-focusing ejection requires no traditional inkjet nozzle, it can soothe the drawbacks of traditional inkjet methods caused by jet nozzles. However, ejection without nozzle needs more for the input energy and energy efficiency in depth.
This thesis presents the fundamental theory about ultrasound-focusing ejection, and addresses the energy relationship, and derives its energy efficiency model. In this study, an ultrasonic focusing ejector of resonance frequency one-MHz is designed and constructed. Ultrasound-focusing ejection and energy efficiency model are verified by the experiments of one-MHz ejection device. This research can be useful in designing the ejection device of high frequency in micro size.
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