Abstract: A piezoelectric harvesting system using repulsion force, according to one embodiment of the present invention, comprises: a piezoelectric body comprising a piezoelectric material; a fixed portion to at least one surface of which the piezoelectric body is adhered; a support portion for supporting one side of the fixed portion; and a repulsion force-providing portion for providing repulsion force to the fixed portion, so that the piezoelectric body generates electric energy when the fixed portion is deformed due to application of external force and then recovered. According to one embodiment of the present invention, additional shock is applied to the fixed portion to which the piezoelectric body is adhered when recovering after being deformed, thereby increasing the amount of electric energy generated due to the deformation of the piezoelectric body.

Abstract: This piezoelectric wafer has: a piezoelectric vibration piece; a frame portion that supports the piezoelectric vibration piece; and a coupling portion that couples the piezoelectric vibration piece to the frame portion. The piezoelectric vibration piece is broken off at the coupling portion and separated from the piezoelectric wafer. On front and back surfaces of the coupling portion, grooved slits extending along a width direction of the coupling portion are formed except for parts of the coupling portion in the width direction. An electrode on at least one of front and back surfaces of the piezoelectric vibration piece is extracted to a frame-portion side of the piezoelectric wafer by way of the part of the coupling portion in the width direction.

Abstract: Aspects of the present disclosure relate to systems and methods for harvesting energy from the pressure ripple of a fluid system. In an example embodiment, a system comprises a housing; a piezoelectric stack in fluid communication with a pressure ripple of a fluid system and configured to generate a piezoelectric voltage and an associated piezoelectric current in response to pressure ripple characteristics, wherein the piezoelectric stack is disposed within the housing; and regulatory circuitry in electrical communication with the piezoelectric stack and configured to convert the piezoelectric current into DC voltage.

Abstract: A piezoelectric ultrasonic motor includes: a drive piezoelectric material wherein a plurality of piezoelectric elements, which are polarized by opposite polarities along a circumferential direction around a rotation shaft, are alternately arranged, and a vibration-control piezoelectric material wherein a plurality of piezoelectric elements, which are arranged along a circumferential direction around the rotation shaft and polarized by opposite polarities, are arranged to correspond to the plurality of piezoelectric elements of the drive piezoelectric material, wherein AC power and another AC power having a phase difference with respect to the AC power are respectively applied to the piezoelectric material and the vibration-control piezoelectric material, in a vibration damping area of the drive piezoelectric material.

Abstract: A piezoelectric device and a method of manufacturing a piezoelectric device are provided. The piezoelectric device includes first and second electrodes disposed on a first surface of a piezoelectric layer; third and fourth electrodes disposed on a second surface of the piezoelectric layer, a first conductor electrically connecting the first and fourth electrodes, and a second conductor electrically connecting the second and third electrodes, in a cross-link with the first conductor.

Abstract: A liquid ejecting head includes a piezoelectric element having a first electrode on a vibration plate, a piezoelectric layer on the first electrode, and a second electrode on the piezoelectric material layer. The piezoelectric layer has functional portions sandwiched between the first and second electrodes; the second electrode configures a common electrode provided continuously across a plurality of the functional portions; the piezoelectric layer extends to an outer side of an end of the first electrode; the vibration plate has a first region opposing the first electrode, a second region opposing an area of the piezoelectric layer extending further toward an outer side than the first electrode, and a third region further toward the outer side than the piezoelectric layer; the second region has a thickness substantially equal to or greater than the thickness of the first region; and the third region is thinner than the first region.

Abstract: A piezoelectric resonator unit that includes a piezoelectric resonator, a substrate including a protruding portion, and a cap joined to the protruding portion. The piezoelectric resonator unit has a first relation of (W1+T1)?w1<(W1+2T1), where, in a long-side sectional view, w1 is a width of an inside of an opening in the cap, T1 is a width of the protruding portion, and W1 is a width of the upper surface of the substrate between parts of the protruding portion; and has a second relation of (W2+T2)?w2<(W2+2T2), where, in a short-side sectional view, w2 is a width of the inside of the opening in the cap, T2 is a width of the protruding portion, and W2 is a width of the upper surface of the substrate between parts of the protruding portion.

Abstract: A bendable apparatus is provided. The flexible material has a first-surface spanned by a first direction and a second direction. The bendable apparatus also includes a first-constraining surface one of: formed in the first-surface of the flexible material; or attached to the first-surface of the flexible material; and a piezo-electric element including a first-edge surface and a second-edge surface opposing the first-edge surface. The piezo-electric element is fixedly attached on the first-surface of the flexible material, so that: the first-edge surface and the second-edge surface are at least approximately perpendicular to the first-surface of the flexible material, and the first-constraining surface is adjacent to the first-edge surface of the piezo-electric element. When a voltage is applied to the piezo-electric element, the piezo-electric element expands in length, the first-edge surface of the piezo-electric element applies a force on the first-constraining surface, and the flexible material bends.

Abstract: A device is provided, including a deformable shell defining an inner space including at least one piezoelectric system. The piezoelectric system includes a flexible piezoelectric membrane capable of generating electric energy under the effect of a deformation to which it is submitted, a rechargeable electric power source, formed on a flexible substrate, and an electronic circuit. The electronic circuit includes a processing circuit for generating and storing data according to the electric energy generated by the piezoelectric membrane, and connected to the electric power source for its electric power supply, and a wireless transmitter connected to the processing circuit to transmit the data stored therein and connected to the electric power source for its electric power supply. Each piezoelectric system is totally arranged on and/or inside of the deformable shell.

Abstract: An electroconductive film for an actuator is formed from a gel composition including carbon nanofibers, an ionic liquid, and a polymer. The carbon nanofibers are produced with an aromatic mesophase pitch by melt spinning.

Abstract: A crystal oscillator package includes a crystal piece configured to vibrate in response to an electrical signal, a first vibrating part protruding from an upper surface of the crystal piece, a second vibrating part protruding from a lower surface of the crystal piece, a first exciting electrode disposed on the first vibrating part, a second exciting electrode disposed on the second vibrating part, and protrusions extending from an end portion of the lower surface of the crystal piece. The protrusions include two or more stages.

Abstract: An inkjet printing head 1 includes an actuator substrate 2 having pressure chambers (cavities) 7, a movable film formation layer 10 including movable films 10A disposed above the pressure chambers 7 and defining top surface portions of the pressure chambers 7, and piezoelectric elements 9 formed above the movable films 10A. Each piezoelectric element 9 includes a lower electrode 11 formed above a movable film 10A, a piezoelectric film 12 formed above the lower electrode 11, and an upper electrode 13 formed above the piezoelectric film 12. The piezoelectric film 12 includes an active portion 12A with an upper surface in contact with a lower surface of an upper electrode 13 and an inactive portion 12B led out in a direction along a front surface of the movable film formation layer 10 from an entire periphery of a side portion of the active portion 12A and having a thickness thinner than that of the active portion 12A.

Abstract: A quartz crystal resonator unit has an overall length less than 2.1 mm and a base portion having a length less than 0.5 mm and a width less than 0.55 mm, vibrational arms, and mounting arms connected to the base portion through connecting portions. Each vibrational arm has a first vibrational portion including a first width and a first length within a range of 0.32 mm to 0.72 mm and a second vibrational portion including a second width greater than the first width and a second length less than the first length. A groove is formed in at least one main surface of the first vibrational portions of the vibrational arms, a width of the groove being less than 0.07 mm and a distance in the width direction of the groove being less than 0.015 mm. A width of the mounting arms is less than 0.45 mm and a width of the connecting portion is less than 0.41 mm.

Abstract: The piezoelectric actuator of the present invention has at least one ceramic component. The ceramic component has an output surface and two driving surfaces. The ceramic component has a height and the output surface is rectangular in shape, wherein the length of the short axis side of the output surface is shorter than the height. Therefore, when a pulse wave input voltage is applied on the driving surfaces, the output surface generates an elliptical motion.

Abstract: A vibration wave motor includes: a vibrator including a vibration plate and a piezoelectric element; a friction member frictionally contacting the vibrator; a pressing member generating a pressing force to bring the vibrator in frictional contact with the friction member; and a pressing force transmitting member between the vibrator and the pressing member to transmit the pressing force to the vibrator. The vibrator and the friction member move in a relative movement direction by an elliptical vibration, and the pressing force transmitting member includes: an engagement portion formed near a contact portion with the pressing member and engaged with the pressing member; a first restricting portion restricting movement in the relative movement direction; and a second restricting portion. restricting movement in a direction perpendicular to a pressing direction by the pressing member and the direction. The pressing force transmitting member is rotatably held with respect to the pressing member.

Abstract: A printed circuit board includes: insulating layers and wiring layers arranged in stacked configuration; a cavity disposed in a first insulating layer among the insulating layers; a piezoelectric substrate disposed in the cavity; an electrode disposed on the piezoelectric substrate and configured to convert an electrical signal into an elastic wave or to convert an elastic wave into an electrical signal; and a sealing part disposed on the piezoelectric substrate, the sealing part enclosing the electrode and forming an air gap around the electrode.

Abstract: Methods and devices are described for driving ferroelectric perovskite oxide crystals to achieve polarization inversion with reduced coercivity. In some embodiments, the anisotropy in the potential energy surface of a ferroelectric material is employed to drive polarization inversion and switching with a reduced coercive field relative to uniaxial excitation. In some embodiments, polarization inversion with reduced coercivity is produced via the application of an electric field that exhibits a time-dependent orientation, in contrast with conventional uniaxial electrical excitation, thereby causing the central ion (and the crystal structure as a whole) to evolve along a lower-energy path, in which the central ion is driven such that it avoids the potential energy maximum. This may be achieved, for example, by applying at least two non-parallel time-dependent voltages (e.g. bias, potential) such that orientation of the electric field changes with time during the switching cycle.

Abstract: An acoustic wave device includes: an IDT provided on a piezoelectric substrate; and gratings provided on both sides of the IDT, wherein: a slowness surface of an acoustic wave has a concave shape; a duty ratio of electrode fingers of the gratings is larger than that of the electrode fingers of the IDT, or a thickness of the electrode fingers of the gratings is larger than that of the electrode fingers of the IDT, or a thickness of an added film provided on the electrode fingers of the gratings is larger than that of an added film provided on the electrode fingers of the IDT; a pitch of the electrode fingers of the gratings is smaller than that of the electrode fingers of the IDT; and a resonant frequency of the gratings is substantially the same as that of the IDT.

Abstract: An SAW device (1) has a piezoelectric substrate (3) propagating acoustic waves, and a comb-shaped electrode (6) arranged on a first surface (3a) of the piezoelectric substrate (3). The SAW device (1) has a columnar terminal (15) located on the first surface (3a) and electrically connected to the comb-shaped electrode (6), and a cover member (9) covering the a side surface of the terminal (15). The terminal (15) comprises, in a first region in the height direction of height thereof, a larger diameter on the side of the first surface (3a) compared with the diameter on the side opposite to the first surface (3a).

Abstract: Disclosed is a stage system comprising at least one flexure frame having a fixed center and movable distal ends configured to displace a tabletop operatively connected thereto along at least one axis of movement and at least two actuators comprising a first actuator and a second actuator positioned within the at least one flexure frame. The first actuator is positioned within the at least one flexure frame at a first angle of deflection from at least one beam of the at least one flexure frame and the second actuator is positioned within the at least one flexure frame at a second angle of deflection from the at least one beam. The at least two actuators are configured to produce a compensating displacement to offset yaw error as the at least two actuators expand from a contracted first position to an expanded second position.