The ultrasonic tubular transducer is activated at the centre thereof by two symmetrical electromechanical converters. The vibration generated by the two electromechanical converters is converted and then transmitted to the tube via a coupler. The ultrasonic transducer can be vibrationally isolated from the interfaces thereof by caps equally suitable for connecting the transducer to a stationary frame, a free end or another similar ultrasonic transducer. A device for pre-stressing electromechanical converters has a hole bored at the centre thereof in order to allow cables from the transducer as well as from adjacent transducers to pass therethrough.

A data link (101) for a MIMO communication system (100) comprises a first transceiver device (106A) comprising a body (109A) having a transducer mounting surface near or at which is mounted a plurality of first transducers (107A-107D) configured to, in use, receive and convert a plurality of electrical waveforms to a respective plurality of acoustic signals. A first bonding layer (120A) bonds a barrier mounting surface of the body of the first transceiver device to a barrier (103). The data link further comprises a second transceiver device (106B) comprising a body (109B) and a plurality of second transducers (107A-107D) configured to receive and convert the plurality of acoustic signals transmitted through the barrier to a respective plurality of electrical waveforms. A second bonding layer (120B) bonds a barrier mounting surface of the body of the second transceiver to the barrier.

Some implementations provide a high-powered compact ultrasonic transducer having an integral piezoelectric ceramic force sensing element utilized to enable enhanced tissue selectivity with a piezoelectric based transducer. Some implementations additionally or alternatively relate to methods and apparatus for driving ultrasonic surgical devices, such as methods and apparatus that modulate an amplitude of a drive signal, provided to an ultrasonic surgical device, in accordance with a selected tissue selectivity level. For example, the amplitude of the drive signal for a given tissue selectivity level can be varied with time in accordance with amplitude modification parameters that are particularized to the given tissue selectivity level. Some of those implementations additionally implement a corresponding duty cycle, for the drive signal, that corresponds to the selected tissue selectivity level.

An electroacoustic transducer 400 is described. The electroacoustic transducer 400 comprises an active element 410. The electroacoustic transducer 400 comprises an acoustic coupling layer 430 arranged to acoustically couple, in use, the active element 410 to a transmission medium. The electroacoustic transducer 400 further comprises a cavity 420 arranged between the active element 410 and the acoustic coupling layer 430 to receive a fluid. In this way, acoustic coupling of the electroacoustic transducer 400 and the transmission medium is improved.

An electroacoustic transducer array 110 is described. The electroacoustic transducer array 110 comprises a first electroacoustic transducer 40A comprising a first active element 41A and a second electroacoustic transducer 40B comprising a second active element 41B. The electroacoustic transducer array 110 comprises an acoustic coupling layer 43 arranged to acoustically couple, in use, the first active element 41A and the second active element 41B to a transmission medium. The electroacoustic transducer array 110 comprises a first cavity 42A arranged between the first active element 41A and the acoustic coupling layer 43 to receive a first fluid; and/or a second cavity 42B arranged between the second active element 41B and the acoustic coupling layer 43 to receive a second fluid. In this way, acoustic coupling of the electroacoustic transducer array 110 and the transmission medium is improved.

A non-contact handling tool (8) for picking up an object (3), the tool comprising an ultrasonic transducer (10) extending between a reflective side and a picking side configured to emit ultrasounds forming, in a near field area of the picking side, an excess-pressure wave, and a fluid suction system configured to suction a fluid towards the picking side, forming in said near field area an under-pressure. The fluid suction system comprises at least a fluid suction channel (30) disposed in the ultrasonic transducer. The transducer has a height defined between the picking side and the reflective side corresponding to a half wavelength of the ultrasounds generated in the transducer.

Some implementations provide a high-powered compact ultrasonic transducer having an integral piezoelectric ceramic force sensing element utilized to enable enhanced tissue selectivity with a piezoelectric based transducer. Some implementations additionally or alternatively relate to methods and apparatus for driving ultrasonic surgical devices, such as methods and apparatus that modulate an amplitude of a drive signal, provided to an ultrasonic surgical device, in accordance with a selected tissue selectivity level. For example, the amplitude of the drive signal for a given tissue selectivity level can be varied with time in accordance with amplitude modification parameters that are particularized to the given tissue selectivity level. Some of those implementations additionally implement a corresponding duty cycle, for the drive signal, that corresponds to the selected tissue selectivity level.

The invention relates to a device for building a closed current circuit A, in which electric charge carriers move at least through a metal conductor, a flowable medium and a resonantly mechanically vibrating metal conductor C, which is mechanically connected to elements which generate mechanical vibrations. The device is characterized in that the current circuit B generating the previously mentioned resonant mechanical vibrations is decoupled from the previously mentioned current circuit A and from the components transmitting mechanical vibrations between the elements generating vibrations and the resonantly mechanically vibrating metal conductor C, which is in contact with the flowable medium, by means of electrically non-conductive coupling elements on two sides of the vibration-generating elements.

A vibration apparatus includes a vibration layer including a piezoelectric material, a first electrode layer at a first surface of the vibration layer, a second electrode layer at a second surface of the vibration layer different from the first surface, and a discharge member electrically connected to the first electrode layer and the second electrode layer.

A vibration apparatus and an apparatus including the same are provided. A vibration apparatus includes a vibration part, a film member including at least one signal line connected with the vibration part, and an adhesive member adjacent to the film member and the vibration part with the at least one signal line between the adhesive member and the vibration part.