1929results about "Force measurement using piezo-electric devices" patented technology

Disclosed herein is a piezoelectric composite device including: a feeding electrode; a common electrode; a signal detecting electrode; a first piezoelectric element joined between the feeding electrode and the common electrode; and a second piezoelectric element joined between the common electrode and the signal detecting electrode; a predetermined voltage being supplied between the feeding electrode and the common electrode; and a force detection signal based on an external force being extracted from the detecting electrode.

In one aspect, the present invention relates to a pressure sensing/force generating device comprising a non-planar substrate, a printed pressure sensitive element comprising (a) a piezoelectric material containing ink composition capable of producing a piezoelectric effect/piezoresistive effect and/or (b) a dielectric material containing ink composition capable of producing a capacitive effect. It also includes a first printed electrode comprising a conductive ink composition, and a second printed electrode comprising a conductive ink composition. The first and second electrodes are in electrical contact with the printed pressure sensitive element. The first and second printed electrodes and the printed pressure sensitive element collectively form a pressure sensitive junction, which is coupled to the non-planar substrate. The present invention further relates to medical devices comprising the pressure sensing/force generating device and methods of making such devices.

The invention provides a pressure sensor, and further provides electronic skin, touch screen equipment and safety alarm equipment correspondingly, wherein the electronic skin, the touch screen equipment and the safety alarm equipment are based on the pressure sensor. The pressure sensor comprises a substrate. The substrate is provided with a plurality of sensing units arranged in an array mode; a static nano generator with two friction layers is adopted in the sensing units, when external force is applied to the sensor, the distance between two friction layers of each sensing unit feeling the external force is changed, and electrical signals output outwards by two corresponding electrode layers are also changed; electrode layers of all sensing units are led out of the sensor through wires, so that functions like pressure (stress) positioning and pressure field mapping can be achieved. The electronic skin, the touch screen equipment and the safety alarm equipment do not need to be powered by power supplies and can conduct pressure induction in a self-driven mode.

A fibrous or cloth piezoelectric element capable of extracting an electric output with relatively small stress produced by rubbing the surface with a finger. The piezoelectric element includes a piezoelectric unit including two conductive fibers and one piezoelectric fiber, all of which are arranged substantially on the same plane while they have contact points between them.

A pneumatic vehicle tire includes a carcass, a bead with a bead core arranged in the bead, and a first sensor located within the bead. The first sensor delivers signals which are correlated to frictional forces transmitted by the pneumatic vehicle tire during operation. This sensor has a first end and a second end, wherein the first end includes a heel attached to the bead core and the second end extends radially outward from the bead core within the tire. A plurality of such sensors can be included in each tire, some for measuring longitudinal forces in a circumferential direction of the tire and others for measuring lateral forces in an axial direction of the tire.

A strain sensor for measuring strain in a surface of an object includes an insulating flexible substrate, a first conductive contact, a second conductive contact and a piezoelectric nanowire. The insulating flexible substrate is coupled to the object. The first conductive contact and the second conductive contact are mounted on the insulating substrate. The piezoelectric nanowire is electrically coupled to the first conductive contact and the second conductive contact. The piezoelectric nanowire is subject to strain when the surface of the object is subject to strain, thereby creating a voltage differential therebetween. A trigger sensor includes a substrate, a piezoelectric nanowire and a conductive contact. The piezoelectric nanowire extends from the substrate. The conductive contact is disposed in relation to the piezoelectric nanowire so that a voltage differential between the substrate and the conductive contact when the substrate moves with the predetermined acceleration.

The invention provides a self-powered pressure sensor which comprises a first induction electrode, a second induction electrode and an intermediate film. The first induction electrode comprises a first macromolecular polymer insulating layer, wherein a conductive film is arranged on the surface of one side of the first macromolecular polymer insulating layer. The second induction electrode comprises a second macromolecular polymer insulating layer, wherein a conductive film is arranged on the surface of one side of the second macromolecular polymer insulating layer, and the intermediate film is fixed on the surface of the other side of the second macromolecular polymer insulating layer. The non-fixed surface of the intermediate film is provided with a micro/nano concave-convex structure. The surface of the micro/nano concave-convex structure of the intermediate film on the second induction electrode is just oppositely attached to and fixedly connected with the surface of the first induction electrode not provided with the conductive film, and the conductive film on the first induction electrode and the conductive film on the second induction electrode are both induction signal output poles. The self-powered pressure sensor is ingeniously made by utilizing a principle of electrification by friction and has the advantages of being high in sensitivity, easy to prepare, low in cost, good in stability in use and quick in response speed and the like.

Energy harvesting systems and methods that use multiple piezoelectric generators connected to the same energy harvesting circuit with minimal or no energy loss. The piezoelectric energy harvesting system may include individual diode bridge circuits electrically connected to the outgoing wires from each piezoelectric generator. The piezoelectric energy harvesting system may include multiple subsystems each having one or more individual diode bridges electrically connected to the outgoing wires from multiple piezoelectric generators. Multiple subsystems, each having multiple piezoelectric generators and a diode bridge, may be electrically connected to the same energy harvesting circuit. The use of multiple piezoelectric generators connected to the same energy harvesting circuit results in improved energy harvesting capabilities, and a simplified and low cost energy harvesting system.

An apparatus and method for determining the kinematic characteristics of a golf club head are disclosed. The apparatus includes at least one piezoelectric component selectively positioned within or upon a club head. The piezoelectric component is preferably positioned to the rear of the center of gravity, and near the midpoint of the face of the club head. During a golf club swing, the piezoelectric component determines the acceleration and deceleration of the golf club head. When the club head impacts an object such as a golf ball, the piezoelectric component is also operable to determine the velocity of the club head. It may also be desirable for the piezoelectric component to determine the magnitude of vibration during impact. In this manner, the piezoelectric component may function determine the efficiency of a golf club swing.

There are provided a fingerprint detection sensor and a method of manufacturing the same. The fingerprint detection sensor includes a plurality of piezoelectric sensors arranged in an array on a two-dimensional plane and having a predetermined height; a filler provided to surround the plurality of piezoelectric sensors and isolating vibrations between the plurality of piezoelectric sensors; and a control unit discharging predetermined output signals through the piezoelectric sensors to detect information of an object in contact with, or close to, the plurality of piezoelectric sensors, wherein the plurality of piezoelectric sensors include first surfaces and second surfaces disposed on both ends thereof in a height direction and areas of the first surfaces and the second surfaces are different from each other.

A tactile sensing transducer provides as its output a skin deformation signal for storage or transmission to a tactile stimulation display transducer. A skin surface imaging means operating optically, acoustically or otherwise is positioned for viewing and providing an output image signal corresponding to said deformed skin surface. An electronic processing means connected to said imaging means provides an output skin deformation signal corresponding to the deformation of said skin. The display transducer may incorporate a plurality of individually actuatable, bendable cantilevered arms mounted in line on a base support, each of the arms having tip ends which are displaceable, upon actuation, to provide a tactile display.

A pressure sensor and a pressure sensing method are provided. The pressure sensor includes a substrate; a sensor thin film transistor (TFT) disposed on the substrate and including a gate insulating layer, wherein the gate insulating layer includes an organic matrix in which piezoelectric inorganic nano-particles are dispersed; a power unit configured to apply an alternating current (AC) signal to a gate of the sensor TFT; and a pressure sensing unit configured to obtain a remnant polarization value based on a drain current which is generated in response to the AC signal and detected by the sensor TFT, and to sense a pressure based on the remnant polarization value.

An acoustic wave device fabrication method includes: forming on a piezoelectric substrate a comb-shaped electrode and a wiring layer coupled to the comb-shaped electrode; forming on the piezoelectric substrate a first dielectric film having a film thickness greater than those of the comb-shaped electrode and the wiring layer, covering the comb-shaped electrode and the wiring layer, and being made of silicon oxide doped with an element or undoped silicon oxide; forming on the first dielectric film a second dielectric film having an aperture above the wiring layer; removing the first dielectric film exposed by the aperture of the second dielectric film by wet etching using an etching liquid causing an etching rate of the second dielectric film to be less than that of the first dielectric film so that the first dielectric film is left so as to cover an end face of the wiring layer and the comb-shaped electrode.

A displacement sensor having a rectangular shaped elastic member. A piezoelectric element is attached to a first main face of the elastic member. The piezoelectric element has a rectangular-shaped piezoelectric sheet and electrodes on both main faces of the piezoelectric sheet. The piezoelectric sheet is made of poly-L-lactic acid and is at least uniaxially-stretched. The piezoelectric element is attached so that the uniaxial-stretching direction of the piezoelectric sheet is 45° relative to a long-side direction of the elastic member. When the elastic member is bent along the long-side direction, the piezoelectric sheet is stretched along the long-side direction, and the piezoelectric element generates voltage of predetermined level.

Various sensor systems are described herein, including inserts having sensors thereon, which are configured to be received in an article of footwear. The inserts may be connected to a sole member of the footwear, or may function as a sole member. The sensors may be bonded to an outer surface of the insert, or positioned within the insert, in some configurations. The system may also include an electronic module that is overmolded into the sole structure and includes a connector for external access.