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| A method of non-contact micromanipulation using ultrasound is proposed in this invention. According to this method, micro particles may be trapped at prescribed small regions and moved in a direction that is substantially parallel to the operating surface of the apparatus. Also major additional advantage of this method is to enable to expand the range of particles that could be manipulated so long as the particles had a different acoustic impedance from that of the medium in the apparatus. Among other advantages are that the cost of the apparatus is relatively low, and the safety is easily secured as ultrasonic waves can be blocked by providing a layer of air between the liquid medium and any human body.FIG shows non-contact micromanipulation apparatus 10 implementing present reference ultrasound transducer 16 reflector 18 disposed tank 14 filled liquid medium 12 outside switch 20 power amplifier 22 function generator 24 personal computer 26 digital oscilloscope 28 propagates little attenuation ultrasonic energy particles manipulated Water pure water alcohol oil exemplary examples FIGS 2(a) 2(b) rectangular plate 30 piezoelectric ceramic material surface electrode 32 wholly covers first principal wraps end edge second vicinity reverse 36 constituted numbers separate short strips 34 parallel connecting leads 38a 38b connected order voltage external source applied electrodes prescribed alternating across multiplicity driven frequency radiating resonant factors shape preferable range radiated considerably major decrease intensity |
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