Provided is a flexible piezoelectric composite. The flexible piezoelectric composite includes a matrix having first and second polymers, wherein Young's modulus of the first polymer and Young's modulus of the second polymer are different from each other; and a conductive nanostructure disposed in the matrix. In addition, a piezoelectric device including the flexible piezoelectric composite is provided.

A tactile reproduction device, a method for driving the same, and a tactile reproduction apparatus. Tactile reproduction device may simulate textures to implement tactile reproduction. tactile reproduction device includes a plurality of piezoelectric units, includes: first electrode, piezoelectric section, and second electrode which are laminated, wherein the second electrode includes: first comb electrode and second comb electrode; the first comb electrode includes: a plurality of first comb-teeth electrodes and a first comb-shank electrode connecting the plurality of first comb-teeth electrodes; the second comb electrode includes: a plurality of second comb-teeth electrodes and a second comb-shank electrode connecting the plurality of second comb-teeth electrodes; the plurality of first comb-teeth electrodes and the plurality of second comb-teeth electrodes are mutually intersected; the first electrode includes a plurality of electrode units which are not connected to each other. The present disclosure is applicable to the production of tactile reproduction devices.

A panel includes a vibration plate having a generally rectangular shape; and a piezoelectric actuator that is provided on a main surface of the vibration plate and causes the vibration plate to vibrate, in which the vibration plate is configured such that a length x in mm of a long side of the vibration plate and logarithmic decrement y of the vibration plate satisfy Expression 1 below:
y≤32.6x.sup.−1   (Expression 1).

In a crystal oscillator, a crystal resonator plate is bonded to, via laminated bonding patterns, a first sealing member covering a first excitation electrode of the crystal resonator plate; and a second sealing member covering a second excitation electrode of the crystal resonator plate. An internal space is formed, which hermetically seals a vibrating part including the first and second excitation electrodes of the crystal resonator plate. The laminated bonding patterns include a laminated sealing pattern annularly formed to surround the vibrating part in plan view so as to hermetically seal the internal space, and a laminated conductive pattern establishing conduction between wiring and electrodes. The laminated conductive pattern is disposed within a closed space surrounded by the laminated sealing pattern. To the laminated sealing pattern, GND potential is applied when the crystal oscillator operates.

The present disclosure relates to a piezoelectric device, and more particularly, to a piezoelectric device including: a piezoelectric actuator; a displacement transmission structure disposed on the piezoelectric actuator; and a displacement amplification structure disposed between the piezoelectric actuator and the displacement transmission structure. Here, the displacement amplification structure includes: a first displacement amplification structure and a second displacement amplification structure, which cross each other; and a fixing pin that passes through the first displacement amplification structure and the second displacement amplification structure to connect the first displacement amplification structure and the second displacement amplification structure. Also, each of one end of the first displacement amplification structure and one end of the second displacement amplification structure may be fixed on the piezoelectric actuator.

A display device includes a display panel, a touch sensing layer which is disposed on a first surface of the display panel and senses a touch input of a user, a first vibration device which is disposed on a second surface of the display panel and generates vibration according to driving voltages. The first vibration device generates a first vibration in response to a first touch input of the user to provide a first haptic feedback.

A tactile device includes: a substrate provided with a first surface; an organic piezoelectric film arranged on the first surface side; a plurality of electrodes arranged on the first surface; and a plurality of drive circuits arranged between the substrate and the organic piezoelectric film. The plurality of electrodes includes: a common electrode arranged across a plurality of cells; and a plurality of driving electrodes respectively arranged in the plurality of cells. The plurality of drive circuits includes: a first drive circuit capable of supplying a first driving signal; and a second drive circuit capable of supplying a second driving signal. The plurality of driving electrodes includes: a first driving electrode connected to the first drive circuit; and a second driving electrode connected to the second drive circuit. The first driving electrode and the second driving electrode are arranged in each of the plurality of cells.

An electroactive polymer actuator includes an electroactive polymer structure and a driver for providing an actuation drive signal. In one aspect, a first drive level is used to charge the electroactive polymer structure from a non-actuated state to an actuated state. When or after the electroactive polymer structure reaches the actuated state, a lower second drive level is used to hold the electroactive polymer structure at the actuated state. This temporary overdrive scheme improves the speed response without damaging the electroactive polymer structure. In another aspect, a driving method makes use of several different level segments over time, which compensates for the delayed actuation response of the EAP actuator.

A method of fabricating an ultrasonic medical device is presented. The method includes machining a surgical tool from a flat metal stock, contacting a face of a first transducer with a first face of the surgical tool, and contacting a face of a second transducer with an opposing face of the surgical tool opposite the first transducer. The first and second transducers are configured to operate in a D31 mode with respect to the longitudinal portion of the surgical tool. Upon activation, the first transducer and the second transducer are configured to induce a standing wave in the surgical tool and the induced standing wave comprises a node at a node location in the surgical tool and an antinode at an antinode location in the surgical tool.

The invention relates to an actuator (1; 1a; 1b) which can be moved from an initial position into a working position having at least one actuator element (2; 2a; 2b) whose dimensions can changed by an electrical signal, Appropriately, at least two restoring means (20, 30; 20a, 30a; 20b, 30b) acting on the actuator element (2; 2a; 2b) are provided for movement into the working position. With the at least two restoring means, a total restoring means characteristic curve, which is composed of portions of the individual, preferably preloaded restoring means as well as a portion of a variable stiffness of the actuator element, can be advantageously tailored.