The embodiments disclose an ultrasonic transducer that can require a piezoelectric element attached to the transducer to be constantly under high pressure, and this required pressure can be provided and maintained by the transducer's design at all temperatures during its operation. The exemplary ultrasonic transducer can eliminate a failure of the bond between the piezoelectric element and a delay block by using the mechanical structure to hold all components in place while permitting the piezoelectric transducer to generate pulses of the desired frequency, frequency bandwidth, and pulse width without undesired echoes and/or attenuations.

Articles of manufacture, including an apparatus for omnidirectional spiral surface acoustic wave generation, are provided. An acoustic wave device that generates a plurality of acoustic wave includes a piezoelectric material to convert electric energy into the plurality of acoustic waves. The acoustic wave device also includes a transducer. The transducer includes a plurality of fingers arranged in a spiral formation. The plurality of acoustic waves induce acoustic streaming along the piezoelectric material in multiple directions to isolate a fluid component within a fluid located on the acoustic wave device.

The present application discloses an evenly heating transducer and a preparation method therefor. The transducer includes a piezoelectric material layer, where the piezoelectric material layer is cylindrical and has a through hole in the middle, a support structure is disposed on an inner side of the through hole, and the piezoelectric material layer and an external device are connected via the support structure. A conductive layer is disposed on a surface of the piezoelectric material layer and an isolation strip is disposed on the conductive layer.

Apparatus for controlling bio-organisms in bodies of water. The algae control system includes a power unit and a transducer unit that radiates in multiple directions. The transducer unit includes a variable power driver and a transducer subassembly. The power from the driver varies to maintain a maximum, constant transducer sonic output over its bandwidth. The transducer assembly includes at least one transducer that includes a pair of blocks with at least one piezoelectric element therebetween. One embodiment has a single, disc-shaped element adhesively secured between said blocks. The transducer is excited by applying power to the pair of blocks. Another embodiment has at least one ring-shaped elements compressed between the two blocks by way of a fastener. The transducer is excited by applying power, in one embodiment, between the blocks and a conductor between a pair of ring-shaped elements, or in another embodiment, between the pair of blocks.

An ultrasonic component packaging structure includes a substrate, an ultrasonic component, a first pin, a second pin, and a protective shell. The substrate includes a first connection pad and a second connection pad. The ultrasonic component includes a first electrode and a second electrode that are electrically connected to the first connection pad and the second connection pad respectively. The first pin and the second pin are electrically connected to the first connection pad and the second connection pad respectively, and extend in an opposite direction of the ultrasonic component. The protective shell surrounds the substrate and the ultrasonic component, and is provided with a first opening to expose the ultrasonic component. Based on the design of the pins, the ultrasonic component can be fixed in a plugging manner, so that interference between ultrasonic components can be avoided, and a sensing distance can be effectively shortened.

A rotor used for an ultrasonic motor, the rotor including a rotor main body; and a plurality of friction materials in the rotor main body and arranged for contact with a vibrating body of a stator, wherein the plurality of friction materials include resin, and wherein the plurality of friction materials are dispersedly arranged in an annular track in a plan view of the rotor.

A method of and system for producing a Bessel-like collimated sound beam frequencies below 1 MHz, and a device for sound (acoustic) imaging. A flat disk piezoelectric transducer having a large diameter/thickness ratio may be configured to exhibit radial vibration modes in the desired frequency range according to one or more parameters, including the diameter/thickness ratio, materials, electrode coverage, etc. The transducer may be driven by a waveform generator at one or more radial mode excitation frequencies.

An acoustic technique designed to increase the gas-dissolution rate of a bubble in a liquid media is proposed. Increased gas-dissolution rate is achieved by increasing the bubble's surface-to-volume ratio via bubble fragmentation. This is achieved by attaching an electroacoustic transducer to the system or load in which bubbles travel and exciting the transducer at the frequency of resonance. The electric resonance of the transducer attached to the system corresponds in frequency to the mechanical resonance of the system or load which allows for achieving such state without the use of an internally placed hydrophone to certify the resonance state. The acoustic bubble fragmentation technique increased the dissolution rate 4 to 5 times of bubbles with initial diameters between 150 and 550 m in distilled water and in medical grade saline solution.

Provided is a vibration-type actuator in which electric contact between a piezoelectric element and an elastic member is sufficiently ensured. In the vibration-type actuator solving the above-described issue, a plate-like piezoelectric material included in the piezoelectric element has a through-hole penetrating in a thickness direction of the piezoelectric material and includes a through-hole electrode filling the through-hole, the through-hole electrode has a protruding portion protruding from a first opening portion of the through-hole that opens on an elastic member side, a ground electrode electrically connected to the through-hole electrode is provided on a surface on the first opening portion side of the piezoelectric material, and the through-hole electrode and the elastic member are electrically connected.

The present invention relates to a heating enhanced structure for a photo-sensitive sensing device with automatic foreign object removal, particularly involving the use of a structure made of flexible and rigid materials for sealing the photo-sensitive sensing device and transmitting vibrations generated by piezoelectric elements. The photo-sensitive sensing device includes a housing, a transparent protective cover, a photo sensor, a lens module, a sealing material with flexibility and rigidity, and a piezoelectric element. The device is further equipped with a heating element to optimize the automatic foreign object removal function, reduce the frequency of piezoelectric element usage, thereby lowering power consumption, extending the operational lifespan, and improving the efficiency of removing small liquid droplets.