|| List of recent Piezoelectric-related patents
| Self-charging powerpack|
A self-charging power pack (300) includes a cathode (312) and an anode (310) that is spaced apart from the cathode (312). An electrolyte (318) is disposed between the anode (310) and the cathode (312).
| Piezoelectric fan|
A piezoelectric fan includes a vibrating plate including blades and a base that are integral. Piezoelectric elements are mounted on the blade on the side of the base.
| Electronic device and method of manufacturing the electronic device|
An electronic device includes a substrate; and a plurality of thin-film elements formed on the substrate. Further, the thin-film element includes a thin-film section having a function selected from a group including piezoelectric effect, inverse piezoelectric effect, charge storage, semiconductivity, and conductivity, and the plurality of thin-film elements includes the thin-film sections having two or more different functions..
| Camera module|
An exemplary embodiment of the present invention includes a support unit, at least two or more connection units extended from the support unit, a lens coupling unit connected to each of the connection units, formed at an inner surface with a window and coupled to at least one or more sheets of lenses, and a piezoelectric driving unit formed at each of the connection units for ascending or descending the connection units and the lens coupling unit.. .
| Fast optical shuttering system|
The system (1) has at least one fabry-pérot cavity (3) with an adjustable gap (e), of which a gap value known as the nominal value allows a laser beam (4) of corresponding frequency to pass through said fabry-pérot cavity (3), controllable piezoelectric actuation means (5a), capable of causing said gap (e) to vary, within a range of gap values including said nominal value, and a control unit (6) to control said actuation means (5a) so that it causes the gap (e) to vary in accordance with a periodic time function.. .
| Localized key-click feedback|
Disclosed herein are techniques and systems for providing simulated, haptic feedback that is local to physical, non-actuating keys of a keyboard. A keyboard includes a plurality of non-actuating keys defined in a cover portion of the keyboard, a plurality of force-producing mechanisms coupled to a substrate underneath and adjacent the cover portion.
| Bulk acoustic wave resonator comprising a boron nitride piezoelectric layer|
A bulk acoustic wave (baw) resonator structure comprises: a first electrode disposed over a substrate; a piezoelectric layer disposed over the first electrode, the piezoelectric layer comprising boron nitride (bn); and a second electrode disposed over the first piezoelectric layer.. .
An oscillator includes: a piezoelectric material to vibrate; a first inverting amplifier; a second inverting amplifier; a first output electrode to apply an output signal of the first inverting amplifier to the piezoelectric material; a second output electrode to apply an output signal of the second inverting amplifier to the piezoelectric material; a first input electrode to receive a voltage signal generated by the piezoelectric material and output the voltage signal to the first inverting amplifier; and a second input electrode to receive the voltage signal and output the voltage signal to the second inverting amplifier, wherein the first and second output electrodes are coupled to the piezoelectric material so that faces of the piezoelectric material move in opposite directions, and the first and second input electrodes are coupled to the piezoelectric material so that the voltage signals are input to the first and second input electrodes.. .
| Arrangement for driving and drive method for a piezoelectric actuator|
A method is disclosed for driving a piezoelectric actuator with a piezoelectric stack, which is operated as an actuating element of an injector. The piezoelectric stack is polarized during production by a polarization process initially with a first field strength, which results in a first length of the piezoelectric stack.
| Piezoelectric device|
A piezoelectric device includes a first electrode film, a piezoelectric film disposed on the first electrode film, and a second electrode film disposed on the piezoelectric film. At least one of the first and second electrode films is composed of an alloy, and a main component of the alloy is a metal selected from the group consisting of ti, al, mg, and zn.
| Thin-film piezoelectric element, thin-film piezoelectric actuator, thin-film piezoelectric sensor, hard drive disk, and inkjet printer|
A thin film piezoelectric element according to the present invention includes a potassium sodium niobate thin film having a structure in which a plurality of crystal grains are present in a film thickness direction; and a pair of electrode films sandwiching the potassium sodium niobate thin film. When the potassium sodium niobate thin film is divided into three regions of the same thickness in the film thickness direction and average crystal grain sizes a1, a2, and a3 of the respective regions are determined, a ratio m/m of the smallest average crystal grain size m among a1, a2, and a3 to the largest average crystal grain size m among a1, a2, and a3 is 10% to 80%.
| Piezoelectric bulk - wave resonator|
A piezoelectric bulk-wave resonator has a single-crystal linbo3 substrate whose euler angles are in the ranges of about (78° to 106°, 78° to 104°, 18° to 53°), a first driver electrode on a first main surface of the single-crystal linbo3 substrate, and a second driver electrode on a second main surface. The first driver electrode and the second driver electrode overlap with the single-crystal linbo3 substrate therebetween.
| Thin film bulk acoustic resonator and method for manufacturing same|
A thin film bulk acoustic resonator and a method of manufacturing the same is disclosed. The thin film bulk acoustic resonator includes an acoustic resonator including a first electrode, a second electrode, and a piezoelectric layer disposed between the first electrode and the second electrode; an air gap disposed below the acoustic resonator and above a substrate to reflect the acoustic wave; and an anchor disposed on each of both surfaces of the air gap and having the same thickness as the air gap..
| Piezoelectric vibrating device|
Provided is a piezoelectric vibrating device including a case provided with a certain space therein, a piezoelectric vibrating member provided in the case and vibrating according to an applied voltage, a weight member provided in the case and connected to a part of the piezoelectric vibrating member in a vibration direction of the piezoelectric vibrating member, and a limitation member for limiting movement of the weight member.. .
| Piezoelectric polymer material and method for producing same|
A piezoelectric polymer material comprising a helical chiral polymer having a weight average molecular weight of from 50,000 to 1,000,000 and optical activity, the piezoelectric polymer material having: crystallinity as obtained by a dsc method of from 40% to 80%; a transmission haze with respect to visible light of 50% or less; and a product of the crystallinity and a standardized molecular orientation morc, which is measured with a microwave transmission-type molecular orientation meter at a reference thickness of 50 μm, of from 40 to 700.. .
| Piezoelectric mems microphone|
A piezoelectric mems microphone comprising a multi-layer sensor that includes at least one piezoelectric layer between two electrode layers, with the sensor being dimensioned such that it provides a near maximized ratio of output energy to sensor area, as determined by an optimization parameter that accounts for input pressure, bandwidth, and characteristics of the piezoelectric and electrode materials. The sensor can be formed from single or stacked cantilevered beams separated from each other by a small gap, or can be a stress-relieved diaphragm that is formed by deposition onto a silicon substrate, with the diaphragm then being stress relieved by substantial detachment of the diaphragm from the substrate, and then followed by reattachment of the now stress relieved diaphragm..
| Method for manufacturing a piezoelectric ceramic body|
The present invention relates to a method of manufacturing a piezoelectric ceramic body and devices therefrom. The method comprises mixing a piezoelectric ceramic powder with a polymer binder and surfactant to form a slip mixture, casting the slip mixture into a mold and setting to the slip mixture in the mold to form a green body, cutting the green body to form a cut green body with an array of micron-sized ceramic elements and separation, and sintering the cut green body to form a sintered ceramic body.
| Piezoelectric ceramic and piezoelectric device containing the same|
A piezoelectric ceramic contains a major proportion of potassium sodium niobate and has a carbon content after firing of 55 to 1,240 ppm by mass.. .
| Piezoelectric valve, and optical granulated substance sorter equipped with air-blowing means that uses this piezoelectric valve|
A piezoelectric valve whose assembly work can be efficiently performed. A piezoelectric valve according to this invention includes a valve main body having a gas pressure chamber which receives compressed gas supplied from the outside, a plate which is disposed inside the valve main body and is fixed to the valve main body, and actuators each of which has a valve element, a piezoelectric element generating, in the form of a displacement, driving force required for operation of the valve element, and a displacement magnification mechanism for magnifying a displacement of the piezoelectric element and causing the magnified displacement to act on the valve element, are fixed to each of two surfaces of the plate, and are disposed inside the valve main body together with the plate..
| Heat dissipating system|
A heat dissipating system including a casing body, a heat source and a piezoelectric fan is provided. The casing body includes an upper casing and a bottom case, wherein at least one of the upper casing and the bottom casing includes at least one air inlet.
| Stress-detecting element, sensor module, and electronic apparatus|
A stress-detecting element includes a support body, a support film, a first piezoelectric element, first and second elastic parts. The support body has an opening part with first and second rectilinear sections extending parallel to each other.
| Ultrasound probe and method of producing the same|
An ultrasound probe comprises: a backing material; a plurality of inorganic piezoelectric elements arranged on a top surface of the backing material; a first acoustic matching layer separated into a plurality of pieces disposed on the plurality of inorganic piezoelectric elements; and a second acoustic matching layer separated into a plurality of pieces disposed on the first acoustic matching layer, wherein the second acoustic matching layer comprises an upper organic layer constituting a plurality of organic piezoelectric elements, and a lower organic layer for performing, together with the upper organic layer, acoustic matching for the plurality of inorganic piezoelectric elements.. .
|Electronic device and system for controlling applications implementing at least one piezoelectric, electrostrictive or magnetostrictive transducer|
The electronic device (1) for controlling comprises an electric power generator (10) suitable for supplying at least one piezoelectric, electrostrictive or magnetostrictive transducer (2), with a control signal (s), electronic controlling means (11) capable of automatically controlling the electric power generator by using a control macro-function (m), and an electronic memory (112) in which the following are stored: a first family (a) of control functions comprising one or a plurality of different elementary control functions (an), making it possible to adjust the amplitude of the control signal (s), a second family (t) of control functions comprising one or a plurality of different elementary control functions (tn), making it possible to adjust the duration of the control signal (s), a third family (c) of control functions comprising a plurality of different elementary control functions (cn), making it possible to adjust the control signal (s) cycle, at least said control macro-function (m), which is made up of the assembly of at least three elementary control functions chosen respectively from among the three families of control functions (a, t, c) recorded in the memory.. .
|Self-oscillating loop based piezoelectric power converter|
The present invention relates to a piezoelectric power converter comprising an input driver electrically coupled directly to an input or primary electrode of the piezoelectric transformer without any intervening series or parallel inductor. A feedback loop is operatively coupled between an output voltage of the piezoelectric transformer and the input driver to provide a self-oscillation loop around a primary section of the piezoelectric transformer oscillating at an excitation frequency.
|Piezoelectric power converter with bi-directional power transfer|
The present invention relates to a bi-directional piezoelectric power converter comprising a piezoelectric transformer. The piezoelectric transformer comprises an input electrode electrically coupled to a primary section of the piezoelectric transformer and an output electrode electrically coupled to an output section of the piezoelectric transformer to provide a transformer output signal.
|Micro-lens for high resolution microscopy|
A method and apparatus for nanoscopy comprising a salt microlens. The microlens-based nanoscope comprises a conventional microscope, a microlens, and a xyz piezoelectric stage is shown (see fig.
|Cantilevered micro-valve and inkjet printer using said valve|
A micro-valve includes an orifice plate including an orifice and a cantilevered beam coupled in spaced relation to the orifice plate and moveable between positions where the orifice is closed and opened by the cantilevered beam. The cantilevered beam includes one or more piezoelectric layers that facilitate bending of the cantilevered beam in response to the application of one or more electrical signals to the one or more piezoelectric layers.
|Method for manufacturing piezoelectric actuator|
A method for manufacturing a piezoelectric actuator is disclosed that includes forming a vibration plate, forming a plurality of electrodes on the vibration plate, forming a piezoelectric layer on the electrodes, and forming a common electrode on the piezoelectric layer.. .
A filter device includes a piezoelectric substrate, an idt arranged on a major surface of the piezoelectric substrate to define a surface acoustic wave resonator, a wiring electrode that is electrically connected to the idt, and an acoustic member located on a major surface of the piezoelectric substrate near or adjacent to the idt and that has an acoustic impedance different from that of the piezoelectric substrate. The wiring electrode that is to be disposed in the vicinity of the idt is located on the acoustic member..
|Elastic wave device|
An elastic wave device includes a resonator and an inductor. One end of the inductor is connected to the resonator, and the other end of the inductor is connected to a ground electrode or a signal electrode.
|Nanoporous piezoelectric polymer films for mechanical energy harvesting|
Piezoelectric materials based on nanoporous polymer foams are provided. Also provided are nanogenerators incorporating the piezoelectric materials, piezoelectric energy harvesters incorporating the nanogenerators and methods of making and using the same.
|Piezoelectric device and method for manufacturing same|
A resin is provided so as to cover four side faces of a piezoelectric multilayer body integrally and thus is effectively prevented from peeling from the piezoelectric multilayer body, whereby high adhesion is attained between the piezoelectric multilayer body and the resin. At the same time, the resin covers dicing surfaces in the side faces of the piezoelectric multilayer body, thereby effectively restraining the piezoelectric body and the electrodes from producing particles..
|Piezoelectric actuation device|
This invention relates to a piezoelectric actuation device and more particularly but not exclusively, to a piezoelectric actuation device with three piezoelectric actuator sets. The device includes a first clamp arrangement being displaceable between an engaged position and a disengaged position and a second clamp arrangement being displaceable between an engaged position and a disengaged position.
|Vibration generating apparatus|
There is provided a vibration generating apparatus including: a piezoelectric element fixedly attached to a vibration transfer member and expanded and contracted in a direction from an inner surface thereof toward an outer surface thereof or in a direction from the outer surface thereof toward the inner surface thereof when power is applied thereto; and a vibration element connected to the piezoelectric element to vibrate.. .
Disclosed is piezoelectric vibrator including a piezoelectric vibrator unit. The piezoelectric vibrator has a vibrating portion, a mass attached on the vibrating portion and having an connecting portion attached on the vibrating portion and at least one extending portion extending from the connecting portion and away from the vibrating portion, and a holder having a stopping portion disposed between the extending portion of the mass and the vibrating portion.
A bulk acoustic wave resonator structure that isolates the core resonator from both environmental effects and aging effects. The structure has a piezoelectric layer at least partially disposed between two electrodes.
|Electronic component element and composite module including the same|
An electronic component element includes a piezoelectric substrate and a comb-shaped electrode located on one principal surface of the piezoelectric substrate. A support layer is arranged around the comb-shaped electrode.
A bearing includes at least an inner ring (12), an outer ring (11), and rolling bodies arranged between the inner and outer rings, one of the rings being designed to turn and the fixed, and one of the rings (11) including an inducing element (30) is designed to generate an inducing electromagnetic field, the other of the rings (12) including an electrical circuit (25) in which an induced current is generated when one of the rings turns in relation to the other of the rings, and when the inducing element (30) generates an inducing electromagnetic field, wherein the inducing element designed to generate an inducing electromagnetic field includes a module having a piezoelectric effect and/or a module having a thermoelectric effect (35).. .
There is provided a displacement sensor which can precisely detect the amount of displacement given by an operator. A touch sensor which is a type of the displacement sensor has a piezoelectric element, a voltage converting unit and a detecting unit.
|Identification of environmental sensor changes and temperature sensor changes with a two layer bulk acoustic wave resonator|
Provided is a method for measurement of a change in environment at a sensor. The sensor has: a first layer formed of a piezoelectric material; a second layer formed adjacent the first layer and acoustically coupled with the first layer; and electrodes disposed to apply a driving signal to the first layer to generate bulk acoustic waves.
|Ultrasonic measurement system|
An ultrasonic transducer 101 includes a piezoelectric element 108. A high-temperature mi cable 102 contains strands 110a, 110b connected to the ultrasonic transducer 101, and further includes a metallic sheath 112.
|Apparatus and method for adapting a piezoelectric respiratory sensing belt to a respiratory inductance plethysmography polysomnograph|
Circuits for rendering piezo-based respiratory belts compatible with polysomnograph (psg) machines designed for use with respiratory induction belts (rips) comprise an instrumentation amplifier adapted to be connected to a piezoelectric transducer and providing an ac output signal to a low-pass filter. In a first embodiment, the low-pass filter output is applied to an input of a microcontroller's a to d converter and the resulting digitized samples are used to vary the resistance of a digital potentiometer whose wiper terminal is coupled in series with an inductor so as to emulate the presence of a rip belt to the psg machine.
|Transducer with piezoelectric, conductive and dielectric membrane|
This disclosure provides systems, methods and apparatus for microspeaker devices. In one aspect, a microspeaker element may include a deformable dielectric membrane that spans a speaker cavity.
Disclosed is a touch panel. The touch panel includes a first substrate; a second substrate spaced apart from the first substrate; an electrode on at least one of the first substrate and the second substrate for detecting a position; and a piezoelectric part having an elasticity which varies depending on an electric field induced by the electrode, wherein the piezoelectric part includes a base and particles distributed into the base, and the base includes a polymer material having elasticity..
|Transparent vibrating touch interface|
The the invention relates to a touch interface comprising a contact surface and means for vibrating the contact surface, said means being provided to generate standing waves in said surface. The contact surface includes at least one transparent portion forming a surface for seeing through the touch interface, and the vibration generating means include at least one rigid piezoelectric layer that is rigidly connected to the contact surface and disposed on the periphery of the transparent portion.
|Printhead waveform voltage amplifier|
A waveform amplifier for a piezoelectric liquid ejection element. The amplifier provides an amplified waveform to the liquid ejection element..
|Haptic feedback using composite piezoelectric actuator|
A haptic tape includes a composite piezoelectric layer connected between a first electrode layer and a second electrode layer. The composite piezoelectric layer has a plurality of piezoelectric rods arranged in a polymer matrix.
|Piezoelectric material, piezoelectric member piezoelectric element, and pressure sensor|
The present invention has an object to provide a piezoelectric material that endures high temperatures, the resources of raw materials of which are abundant, and that is stably suppliable. Disclosed is a piezoelectric element, including: a piezoelectric member having a surface for receiving external stress and a side surface that is perpendicular to the surface for receiving external stress; and at least one pair of a first electrode and a second electrode that are placed on the side surface, the first electrode being provided so as to separate from the second electrode.
A piezoelectric resonator including a base part, a first support part fixed to the base part, a beam part fixed to the first support part, a weight part fixed to the beam part, a drive unit provided on the beam part, and an adjusting magnet movable on a main surface of the base part. Furthermore, the weight part is formed of a magnet or a magnetic body, and the beam part extends in a direction along the main surface of the base part.
|Semiconductor device for electron emission in a vacuum|
A semiconductor device for electron emission in a vacuum comprises a stack of two or more semi-conductor layers of n and p type according to sequence n/(p)/n forming a juxtaposition of two head-to-tail np junctions, in materials belonging to the iii-n family, two adjacent layers forming an interface. The semiconductor materials of the layers of the stack close to the vacuum, where the electrons reach a high energy, have a band gap eg>c/2, where c is the electron affinity of the semiconductor material, the p-type semiconductor layer being obtained partially or completely, by doping impurities of acceptor type or by piezoelectric effect to exhibit a negative fixed charge in any interface between the layers, a positive bias potential applied to the stack supplying, to a fraction of electrons circulating in the stack, the energy needed for emission in the vacuum by an emissive zone of an output layer..
|System and method for determining tire uniformity parameters from piezoelectric measurements in the tire counter-deflection zone|
Systems and methods of determining tire uniformity parameters from piezoelectric tire sensor output signals obtained while operating in the counter-deflection zone include establishing a transfer function that relates a tire uniformity parameter to the piezoelectric output signals. Piezoelectric output signals from two or more piezoelectric tire sensors are then monitored to measure the voltage change from each piezoelectric tire sensor while it is operating in the counter-deflection zone.
|Encapsulated piezoelectric valve|
An actuator assembly includes a housing and an actuator arranged within the housing, the actuator including a first part and a second part movable relative to the first part. An insulating material is disposed within the housing, the insulating material encapsulating at least the movable part of the actuator..
|Passive physiological monitoring (p2m) system|
Passive physiological monitoring apparatus and method has a sensor for sensing physiological phenomenon. The sensor is a piezoelectric film of polyvinylidene fluoride.
|Medical tool for reduced penetration force with feedback means|
A medical device for reducing the force necessary to penetrate living being tissue using a variety of reciprocating motion actuators, including piezoelectric, voice coil, solenoids, pneumatics or fluidics. The reciprocating actuator drives a penetrating member through the tissue at a reduced force while the device detects the passage of the penetrating member through the tissue.
|Electronic brachytherapy radiation application apparatus comprising a piezoelectrically powered x-ray source|
The invention relates to a radiation application apparatus for applying radiation at a location within an object. The radiation application apparatus comprises a transforming unit (2) for being arranged within the object at the location and for transforming ultrasound energy to electrical energy, and a radiation source (4) for being arranged within the object and for generating radiation (5) to be applied at the location within the object, wherein the radiation source (4) is driven by the electrical energy.
|Ultrasonic wave transducer using a signal pathway-integrated housing|
The present disclosure relates to an ultrasonic wave transducer using a signal pathway-integrated housing. The ultrasonic wave transducer includes: a housing serving as a handle; an array including a plurality of piezoelectric elements disposed in parallel to each other on a back material and a flexible circuit board having a pattern electrically connected to the piezoelectric elements; and a cable assembly including a plurality of fine wires.
|Method, system and device for providing customized point of care testing|
A method, system and device for providing point of care testing (poct) are disclosed. The poct comprises of a device that enables the patient to self conduct plurality of diagnostic tests for a chronic disease such as diabetes mellitus.
|Inkjet print head|
There is provided an inkjet print head including a substrate member including an ink channel, a piezoelectric actuator formed on the substrate member, and a coating member formed on the piezoelectric actuator and including a photosensitive material.. .
|Methods and systems for providing haptic control|
Haptic systems are disclosed which may provide increased resolution in tactile feedback. A tiered haptic system may be formed by stacking of haptic elements.
|Surface acoustic wave device and composite module including same|
A surface acoustic wave device includes a piezoelectric substrate including an interdigital transducer located on one principal surface thereof, an insulating layer arranged around the interdigital transducer, a cover layer arranged over the insulating layer and the interdigital transducer, and a columnar electrode penetrating through the insulating layer and the cover layer, and connected to the interdigital transducer through a connection wiring, wherein a buffer layer is arranged on the other principal surface of the piezoelectric substrate.. .
|Semiconductor apparatus, oscillation circuit, and signal processing system|
A semiconductor apparatus includes: first and second external terminals that are connected to respective both ends of an piezoelectric vibrator, in which the piezoelectric vibrator is externally disposed; an inverting amplifier that is disposed between the first and second external terminals; a feedback resistance that feeds back an output of the inverting amplifier to an input of the inverting amplifier; a first capacitative element that is disposed between the first external terminal and a reference voltage terminal; a first resistive element that is disposed in series with the first capacitative element; a second capacitative element that is disposed between the second external terminal and the reference voltage terminal; and a second resistive element that is disposed in series with the second capacitative element.. .
|Field device with self-testing of a piezoelectric transducer|
An industrial process field device having a piezoelectric transducer performs self-testing of the condition of the piezoelectric transducer during a self-test mode. A charging current is supplied to the piezoelectric transducer, and voltage on the piezoelectric transducer as a result of the charging current is monitored.
In a piezoelectric device, an identification pattern provided on a main face of a piezoelectric body is covered with an electrode, so as to inhibit the identification pattern from generating particles, while the identification pattern makes the polarity of the piezoelectric device discernible by the appearance thereof.. .
|Flow energy piezoelectric bimorph nozzle harvester|
A flow energy harvesting device having a harvester pipe includes a flow inlet that receives flow from a primary pipe, a flow outlet that returns the flow into the primary pipe, and a flow diverter within the harvester pipe having an inlet section coupled to the flow inlet, a flow constriction section coupled to the inlet section and positioned at a midpoint of the harvester pipe and having a spline shape with a substantially reduced flow opening size at a constriction point along the spline shape, and an outlet section coupled to the constriction section. The harvester pipe may further include a piezoelectric structure extending from the inlet section through the constriction section and point such that the fluid flow past the constriction point results in oscillatory pressure amplitude inducing vibrations in the piezoelectric structure sufficient to cause a direct piezoelectric effect and to generate electrical power for harvesting..
|Piezoelectric sound-generating body and electronic device using the same|
A piezoelectric drive element includes piezoelectric layers, electrode layers between the piezoelectric layers, and electrode layers as the surfaces of the laminated layers. The piezoelectric layers are arranged on the upper side and on the lower side with reference to the center in the thickness direction, and are polarized in opposite directions.
|Poling treatment method, magnetic field poling device, and piezoelectric film|
To perform poling treatment in a simple procedure by dry process. An aspect of the invention is a magnetic field poling device including: a first holding part configured to hold a film-to-be-poled 2; a second holding part configured to hold a magnet generating a magnetic field b to the film-to-be-poled 2; and a moving mechanism configured to move the first holding part or the second holding part in a direction perpendicular to the direction of the magnetic field b..
A piezoelectric actuator for a fuel injector may include a piezoelement that can be deflected along the longitudinal axis in the longitudinal direction of the fuel injector, and a separating wall for protecting the piezoelement from an overflow of a medium from the fuel-guiding part of the fuel injector, the piezoelement being preconstrained in the axial direction by the separating wall.. .