A piezoelectric resonator device adapted to miniaturization while saving a region to be bonded to an external circuit board is provided, which includes an external connection terminal with a highly recognizable distinguishing mark. A crystal resonator 1 includes: a base 2 having a substrate 20, a first frame 21 and a second frame 22; a crystal resonator element 3 housed in a first recessed portion E1; a thermistor 4 housed in a second recessed portion E2; and a lid 5 hermetically sealing the first recessed portion E2. L-shaped external connection terminals 9a to 9d are respectively formed at four corners of a top surface of the second frame. Non-electrode bank regions 9e, 9f, 9g and 9h are formed between respective inner edges of the external connection terminals at the four corners and an inner peripheral edge 221 of the second frame. On the external connection terminal 9c, a protrusion 92c is formed spaced apart from an outer peripheral edge 220 and the inner peripheral edge 221 of the second frame.

A piezoelectric device includes a piezoelectric vibrating piece, a container, and a lid. The piezoelectric vibrating piece is bevel processed and has a bevel surface at one end of the piezoelectric vibrating piece. Thea container holds the piezoelectric vibrating piece with the bevel surface at the one end of the piezoelectric vibrating piece. The container has a connection pad at a holding region of the container and a pillow portion at a region corresponding to the other end of the piezoelectric vibrating piece. The lid member seals the container. The connection pad is buried in the container at the holding region in a state of a flat surface with a surface of the container and in a state where the surface of the connection pad is exposed. The piezoelectric vibrating piece is spanned between the surface of the connection pad and a top surface of the pillow portion.

A piezoelectric drive device includes: a vibrating body having a first surface and a second surface provided with a recessed portion; and a piezoelectric element provided on the first surface. The recessed portion and the piezoelectric element have an overlap region when viewed in a normal direction of the second surface.

A piezoelectric band (10) includes: a base sheet (11) that has flexibility and is formed into a sheet shape; a piezoelectric sheet (20) that has flexibility and is formed into a sheet shape and placed over one side of the base sheet (11); and a cover sheet (12) that has flexibility and is formed into a sheet shape and placed over and in contact with one side of the piezoelectric sheet (20) that faces away from the base sheet (11). Upon reception of a drive signal, the piezoelectric sheet (20) vibrates at or above a frequency of 15 kHz. The cover sheet (12) has a plurality of holes (12a) passing therethrough from one side facing the piezoelectric sheet (20) to the other side, and the plurality of holes (12a) forms respectively air layers through which vibration of the piezoelectric sheet (20) propagates toward the other side.

A MEMS resonator is provided with improved electrical characteristics and reduced spurious resonances. The MEMS resonator includes two or more first rectangular resonator plates with lengths greater than their respective widths. Moreover, the MEMS resonator includes two or more second rectangular resonator plates that are positioned parallel to the first resonator plates in the widthwise direction of the MEMS resonator. The length of the second resonator plates is different than the length of the first resonator plates to reduce spurious resonances.

A servovalve includes a fluid transfer valve assembly comprising a supply port and a control port, a moveable valve spool arranged to regulate flow of fluid from the supply port to the control port in response to a control signal, and a drive assembly configured to axially move the valve spool relative to the fluid transfer assembly in response to the control signal to regulate the fluid flow. The drive assembly includes a steerable member moveable by an amount determined by the control signal to cause corresponding movement of the valve spool. The drive assembly further includes piezoelectric actuator means configured to move said steerable member in response to the control signal.

A system having improved trapping force for acoustophoresis is described where the trapping force is improved by manipulation of the frequency of the ultrasonic transducer. The transducer includes a ceramic crystal. The crystal may be directly exposed to fluid flow. The crystal may be air backed, resulting in a higher Q factor.

A piezoelectric element includes: a piezoelectric body; and a first electrode which is disposed on the piezoelectric body, and in which in a plan view viewed from a direction where the first electrode and the piezoelectric body are aligned, a region which is a surface of the piezoelectric body on which the first electrode is disposed, located at a vicinity of the first electrode, and within 10 m from an outer edge of the first electrode has a crystal surface.

A vibrator includes a vibrating part including a pair of vibrating plates and a piezoelectric material provided between the pair of vibrating plates, a supporting part including a pair of supporting plates and an interplate portion provided between the pair of supporting plates, and a wire provided in the vibrating part and the supporting part, wherein the wire is exposed from the supporting part.

A microactuator for a dual stage actuated suspension for a hard disk drive is constructed as a longitudinal stack of piezoelectric (PZT) elements acting in the d33 mode, expanding or contracting longitudinally when an electric field is applied across them in the longitudinal direction. The microactuator has interlaced electrode fingers that separate and define the individual PZT elements, and apply the electric field. A stiff constraint layer having a high Young's modulus is affixed to the microactuator on the side opposite the suspension to which the microactuator is bonded. The constraint layer may be a layer of substantially inactive PZT material that is formed integrally with the PZT elements but without electrodes in the inactive PZT layer. The presence of the stiff constraint layer increases the effective stroke length of the microactuator.