An ultrasonic transducer element chip includes a substrate defining an opening, an ultrasonic transducer element disposed at a position corresponding to the opening in a thickness direction of the substrate, and a reinforcing member connected to the substrate to cover the opening. The reinforcing member defines a ventilation passage from the opening to an outside of the substrate.

An ultrasonic biometric scanner includes an ultrasonic multiple scan element array with multiple scan elements. The array includes piezoelectric material such as lead zirconate titanate or polyvinylidene difluoride with a first electrode on a first surface and a second electrode on a second, opposite surface. At least one of the first electrode or the second electrode include multiple electrodes wherein the number of the multiple electrodes corresponds to a number of the multiple scan elements. A substrate is electrically coupled to the second electrode and/or the first electrode. A cover may be positioned over the first electrode. The cover has an acoustic impedance matching ultrasonic signals emitted by the piezoelectric material.

Within a housing portion in which a recessed portion is formed, a circuit board is arranged on the bottom surface of the recessed portion, through a first connecting member. An acceleration sensor is stacked on the circuit board, through a second connecting member. Hence, sections that function as three or more springs, i.e., an anti-vibration portion, the first connecting member, and the second connecting member, are situated between an angular velocity sensor and the acceleration sensor. For this reason, transmission of vibration of the vibrating element in the angular velocity sensor to the acceleration sensor can be restricted, and reduction in the detection accuracy of the acceleration sensor can be restricted.

An electromechanical transformation device for an ultrasonic flow meter comprises an alkaline niobate piezoelectric ceramic composition and a rigid body adhered onto the major surface of the ceramic composition. The ceramic composition is made of crystal structures such as orthorhombic crystals formed at the side where the temperature is lower than the orthorhombic-to-tetragonal phase transition temperature, tetragonal crystals formed at the side where temperature is higher that the orthorhombic-to-tetragonal phase transition temperature as well as at the side where the temperature is lower than the tetragonal-to-cubic phase transition temperature, and the cubic crystals formed at the side where the temperature is higher than the tetragonal-to-cubic phase temperature. Young's modulus of the rigid is 60 GPa or more. THe volume percent of the ceramic composition existing within a range where the distance from the adhesion point of the piezoelectric ceramic composition and the rigid body is 40% or more.

A force sensing device is mounted on a tool to sense force, particularly quasi-static and static forces. The force sensing device includes at least one a sensor. A piezoelectric element in the sensor includes a driving portion and a sensing portion. A first voltage is input to the driving portion to generate a vibration in the piezoelectric element and a second voltage in response to the vibration is output from the sensing portion. The second voltage output from the sensing portion is changed as the vibration in the piezoelectric element is suppressed by an external force acting on the force sensing device so variation of the second voltage can be used to measure the external force.

A method of making a stretchable transducer is disclosed. The method includes placing a polymer solution having a concentration (C) in an injectable vessel having an electrically conductive ejection port, applying a voltage (V) between the ejection port and an electrically conductive collection plate a predetermined distance away from the ejection port, ejecting the polymer solution from the injectable vessel at a flow rate (FR), thereby generating a fibrous material having a considerable -phase on the collection plate due to electrospinning, removing the fibrous material from the collection plate, depositing conductive electrodes on top and bottom surfaces of the removed fibrous material, thereby generating a transducer, and simultaneously optimizing formation of -phase of the fibrous material and yield of the transducer based on unwanted electrical current leakage between deposited electrodes on the top and bottom surfaces based on C, V, and FR.

A stretchable transducer includes one or more rectangular sensing regions, each including one or more sensing layers, each including fibrous sensing materials sandwiched between a top and a bottom electrode, two or more substrates adapted to sandwich the one or more sensing layers further forming one or more serpentine regions adapted to allow stretchability of the stretchable transducer, the two or more substrates having axial gaps therebetween, one or more electrical connection regions distally extended longitudinally from the one or more serpentine regions, wherein the one or more electrodes extend longitudinally from the one or more sensing regions through the gaps formed in the serpentine regions and terminating at the one or more electrical connection regions, two clamping regions distally extended longitudinally from the one or more electrical connection regions adapted to provide coupling to the stretchable transducer, and an encasing layer.

A piezoelectric microelectromechanical structure is provided with a piezoelectric stack having a main extension in a horizontal plane and a variable section in a plane transverse to the horizontal plane. The stack is formed by a bottom-electrode region, a piezoelectric material region arranged on the bottom-electrode region, and a top-electrode region arranged on the piezoelectric material region. The piezoelectric material region has, as a result of the variable section, a first thickness along a vertical axis transverse to the horizontal plane at a first area, and a second thickness along the same vertical axis at a second area. The second thickness is smaller than the first thickness. The structure at the first and second areas can form piezoelectric detector and a piezoelectric actuator, respectively.

An ultrasonic transducer includes a substrate, a supporting film disposed on the substrate, and a piezoelectric element disposed on the supporting film. The substrate includes an opening. The piezoelectric element is disposed on an area that overlaps the opening in a plan view in a thickness direction of the substrate. A thickness of the supporting film at an area that overlaps the piezoelectric element in a plan view of the supporting film is smaller than a thickness of the supporting film at a different area different from the area that overlaps the piezoelectric element.

An ultrasonic transducer element chip includes a substrate defining an opening, an ultrasonic transducer element disposed at a position corresponding to the opening in a thickness direction of the substrate, and a reinforcing member connected to the substrate to cover the opening. The reinforcing member defines a ventilation passage from the opening to an outside of the substrate.