Abstract: An ultrasonic transducer device including a substrate, an edge support structure connected to the substrate, and a membrane connected to the edge support structure such that a cavity is defined between the membrane and the substrate, the membrane configured to allow movement at ultrasonic frequencies. The membrane includes a structural layer, a piezoelectric layer having a first surface and a second surface, a first electrode placed on the first surface of the piezoelectric layer, wherein the first electrode is located at the center of the membrane, a second electrode placed on the first surface of the piezoelectric layer, wherein the second electrode is a patterned electrode comprising more than one electrode components that are electrically coupled, and a third electrode coupled to the second surface of the piezoelectric layer and electrically coupled to ground.

Abstract: An ultrasonic transducer array including a substrate, a membrane overlying the substrate, the membrane configured to allow movement at ultrasonic frequencies, and a plurality of anchors connected to the substrate and connected to the membrane. The membrane includes a piezoelectric layer, a plurality of first electrodes, and a plurality of second electrodes, wherein each ultrasonic transducer of a plurality of ultrasonic transducers includes at least a first electrode and at least a second electrode. The plurality of anchors includes a first anchor including a first electrical connection for electrically coupling at least one first electrode to control circuitry and a second anchor including a second electrical connection for electrically coupling at least one second electrode. The ultrasonic transducer array could be either a two-dimensional array or a one-dimensional array of ultrasonic transducers.

Abstract: A deep finger ultrasonic sensor device includes an array of ultrasonic transducers and an array controller configured to control activation of ultrasonic transducers of the array of ultrasonic transducers during an imaging operation for capturing a depth image of a finger, where the depth image includes a plurality of features inside the finger. The array controller is configured to control transmission of ultrasonic signals and receipt of reflected ultrasonic signals during the imaging operation, where the reflected ultrasonic signals are utilized in generating the depth image of the finger.

Abstract: A device for controlling liquid motion includes a substrate (10) of material having piezoelectric properties, and a system for controlling the motion of a quantity of liquid placed in contact with the substrate. The control system includes at least one interdigitated transducer (T1, T3, T5, T7), applied to the substrate (10) and designed for selectively generating a surface acoustic wave adapted to propagate on the substrate (10) and interact with the quantity of liquid. The control system further includes an acoustic resonator (30) which is placed on the path of the surface acoustic wave, and which is adapted to normally allow the forward transmission of the surface acoustic wave having a frequency equal to a resonance frequency of the acoustic resonator, and to reflect the surface acoustic wave back towards the transducer when the quantity of liquid is present within the acoustic resonator.