Abstract: To provide an ultrasonic cleaning apparatus and an ultrasonic cleaning method capable of suppressing generation of cleaning unevenness after the ultrasonic cleaning of an object to be cleaned. An aspect of the present invention includes a cleaning tank 21 in which a cleaning liquid 23 is stored; a first and a second ultrasonic transducers 34a and 34b that give ultrasonic vibrations to the object to be cleaned 22 immersed in a cleaning liquid within the cleaning tank; a first ultrasonic generator 36 that applies a high-frequency output to the first ultrasonic transducer; a second ultrasonic generator 37 that applies a high-frequency output to the second ultrasonic transducer; and a controller 38 that varies and controls at least one of the outputs of the first and the second ultrasonic generators, and a first ultrasonic wave oscillated from the first ultrasonic transducer is caused to interfere with a second ultrasonic wave oscillated from the second ultrasonic transducer.

Abstract: A method of non-contact micromanipulation using ultrasound includes disposing in a liquid medium in which micro particles are distributed, an ultrasound transducer comprising a transducer plate, a surface electrode wholly covering a first principal surface of the transducer plate and a reverse surface electrode on a second principal surface of the transducer plate comprising a plurality of short electrode strips arranged in parallel, and a reflector set in parallel opposition to the first principal surface of the transducer plate from which the reflector is spaced apart by a prescribed distance, applying a voltage to at least one electrode strip selected from the plurality of electrode strips to radiate ultrasound to form a standing wave field between the ultrasound transducer and the reflector to trap micro particles, and electrically switching the voltage being applied to the selected electrode strip to an adjacent electrode strip to move the standing wave field by moving a position of ultrasound radiated b

Abstract: A method of non-contact micromanipulation using ultrasound includes providing a concave ultrasound transducer in a liquid medium in which micro particles are distributed, positioning a reflector at the focal point position of the transducer and radiating ultrasound from the transducer to form a standing wave field between the transducer and the reflector to align and trap micro particles at half wavelength intervals along the axis of the transducer.