|| List of recent Transducer-related patents
|Optmizing energy transmission in a leadless tissue stimulation system|
Method and systems for optimizing acoustic energy transmission in implantable devices are disclosed. Transducer elements transmit acoustic locator signals towards a receiver assembly, and the receiver responds with a location signal.
|Method and apparatus for controlling ultrasound system|
Provided are an ultrasound system and methods that deliver medication through skin by using multiple frequencies. The method to deliver medication through skin include irradiating the skin with ultrasound having a first frequency to cavitate a skin tissue; irradiating the skin with ultrasound having a second frequency, which is lower than the first frequency, to collapse the cavitated tissue; and delivering the medication through the collapsed tissue, wherein a single transducer is configured to produce the ultrasound having the first frequency and the ultrasound having the second frequency..
|Ring laser for use with imaging probe as a safe margin indicator|
A surgical imaging apparatus is disclosed, and includes an elongate body having a proximal portion and a distal portion and including at least one ultrasonic transducer. The surgical imaging apparatus also includes at least one light source being operatively coupled with the elongate body and configured to move relative to the elongate body.
|Ultrasonic probe and ultrasonic medical system adopting the same|
An ultrasonic probe and a medical system adopting the same. The ultrasonic probe includes at least one support plate having a first state of being folded and a second state of being unfolded.
|Probe with optoacoustic isolator|
An optoacoustic probe including an ultrasound transducer array, an acoustic lens and a light path separated from the transducer array by an isolator to mitigate light energy from the light path from reaching the transducer array. The isolator being formed from a mixture including a flexible carrier, a coloring and between 10% and 80% by volume micro-bubbles.
|Apparatus and method for spatially selective interventional neuroparticles|
An apparatus and method are provided for spatially-selective administration of actions by at least one device in the body using a transducer that is sensitive to a spatially-variant energy field imposed on the at least one device by a source external to a subject's body; and at least one component in the at least one device, wherein interaction of the transducer with the imposed spatially-variant energy field causes or enables at least one component in the at least one device to affect nearby tissues in the body.. .
|Vegetable oil extraction|
A method of extracting recovering oil from vegetable material in which oil bearing material is heated and subjected to sonication at least one frequency above 400 khz, removing a first yield of oil by decanting and subjecting the retained material to centrifugal separation to separate out a second yield of oil. Preferably the raw vegetable material is passed through a screw press and the obtained material is heated and subjected to the ultrasonic treatment and then allowed to settle for a predetermined period before decanting the oil layer.
|Determining top-dead-center (tdc) of reciprocating compressor|
Various embodiments include approaches for determining a top-dead-center (tdc) of a reciprocating compressor. In some cases, an apparatus includes: a pressure transducer configured to measure pressure fluctuations inside a compressor cylinder and convert the pressure fluctuations into an asynchronous waveform; and at least one computing device operably connected with the pressure transducer, the at least one computing device configured to: extract a data set representing piston angles over a single revolution of a piston within the compressor cylinder from the asynchronous waveform; remove data representing invalid piston angles from the data set to form a refined data set; determine an average piston angle for the single revolution from the refined data set; and adjust the refined data set to identify a top-dead-center (tdc) position of the piston within the compressor cylinder..
|Hearing device with two or more microphones and two or more resonators having different lengths and the same resonant frequency|
The invention regards a hearing device with two or more microphone units each having a conduit leading from a respective sound inlet in the hearing-device housing to a respective transducer, wherein the lengths of the conduits may differ without causing a difference in the frequency characteristics of the microphone units and wherein ultrasonic frequencies may be dampened, while at the same time providing higher freedom in the physical layout of the hearing device. This is achieved in that each conduit comprises a chamber and a pipe forming a resonator, and in that the frequencies of resonance (f1, f2) of the resonators are equal..
|System and method for fitting hearing devices|
An improved method and apparatus for automatic haring device fitting have been disclosed. The disclosed apparatus includes a search engine for searching the optimal settings of a hearing device, a first selector for patient to alternate the hearing device between two presets, and a second selector for patient to register the preference or no preference to the two presets.
|Adding randomness internally to a wireless mobile communication device|
An electronic device is provided with an integral transducer used to update a random data pool without connection to an external source of new random data. In one embodiment, there is provided a method for providing random data on an electronic device, the method comprising: storing random data in a random data pool in a memory; sensing motion of the electronic device using a transducer integrally carried as part of the electronic device, wherein the transducer is configured to generate an output in response to sensed motion; generating new random data in accordance with the output of a transducer when sensed motion exceeds a threshold; and storing the new random data in the random data pool in the memory..
|Ultrasound probe with an acoustical lens|
The present invention relates to an ultrasound probe (60) comprising: an ultrasound transducer (12) having an emission surface (24) for generating ultrasound waves, and an acoustical lens (12) with a first part (64) having an inner surface (66) facing the emission surface (24), wherein the inner surface (64) comprises a plurality of protrusions (74) and/or recesses (76) for scattering reflections of ultrasound waves.. .
|Downhole optical acoustic transducers|
A method of generating an acoustic signal in a subterranean well can include converting optical energy to acoustic energy downhole, thereby transmitting the acoustic signal through a downhole environment. A well system can include an optical acoustic transducer disposed in the well and coupled to an optical waveguide in the well, whereby the transducer converts optical energy transmitted via the optical waveguide to acoustic energy.
|Automatic processing of ultrasonic data|
An example method for automatically characterizing an echo contained in an ultrasonic signal generated with an ultrasonic transducer can include receiving data corresponding to the ultrasonic signal, calculating an energy ratio of the ultrasonic signal and localizing the echo using the energy ratio. The method can include windowing a portion of the ultrasonic signal around the localized echo and calculating a fast fourier transform (fft) and a hilbert envelop of the windowed portion.
|Ultrasound imaging system|
An ultrasound imaging system includes a probe with a transducer array with at least one transducer element that transmits ultrasound signal and receives echo signals produced in response thereto. The system further includes a console with a controller that controls the at least one element to transmit the ultrasound signals and receive the echo signals, and an echo processor that processes the received echoes and generates images indicative thereof.
|Stealth dicing for ultrasound transducer array|
An ultrasound transducer array is formed with stealth dicing. A laser is used to form defects within the piezoelectric substrate and along the desired kerf locations.
|Electromechanical transducer and production method therefor|
An electromechanical transducer includes a plurality cells that are electrically connected to form a unit. Each of the cells includes a first electrode and a second electrode provided with a gap being disposed therebetween.
|Solid-state transducer devices with optically-transmissive carrier substrates and related systems, methods, and devices|
Semiconductor device assemblies having solid-state transducer (sst) devices and associated semiconductor devices, systems, and are disclosed herein. In one embodiment, a method of forming a semiconductor device assembly includes forming a support substrate, a transfer structure, and a plurality semiconductor structures between the support substrate and the transfer structure.
|Fluid medium sensor system and method|
An apparatus employs a plurality of transducers distributed along a cable to sample a medium. Some of the transducers may be operated according to various sequences which specific wavelengths and/or magnitudes of emission of electromagnetic energy.
|System for cleansing organisms from water|
Techniques for depleting target organisms in water include a waterproof transducer configured for ensonifying a container of water with low intensity sound at one or more ultrasound frequencies for a duration sufficient to prevent maturation of at least 90% of the target organism. In some cases the target organism is mosquito larvae.
|Keyboard musical instrument|
A keyboard musical instrument, including: a key; a board; a first member formed of a material different from a material of the board; a first acoustic transducer configured to vibrate the board in accordance with a drive signal supplied thereto; and a second acoustic transducer configured to vibrate the first member in accordance with a drive signal supplied thereto.. .
|Soundboard acoustic transducer|
A soundboard acoustic transducer, including: a main body; and a vibrator configured to vibrate a soundboard in response to a sound signal input thereto, wherein the main body is supported by a member different from the soundboard, via a fixture formed by a metal plate.. .
|Ultrasonic measurement device and a method for operating the same|
A method for operating an ultrasonic device comprising a first and second ultrasonic transducers, includes driving the first and second transducers at a driving frequency such that the first and second transducers generate a first and a second signals, respectively. The method also includes sensing the second signal at the first transducer to produce a first measurement signal and sensing the first signal at the second transducer to produce a second measurement signal.
|Integrity monitor for reference cavity of capacitance diaphragm gauge|
A system and method detect the presence of an unacceptable quantity of gas molecules in the reference vacuum cavity of a capacitance diaphragm gauge (cdg). An independent pressure transducer has an active portion exposed to the reference vacuum cavity.
|Ultrasonic testing method and ultrasonic array probe|
An array probe 3 is provided with an array probe body 32 having a plurality of transducers 31 linearly arranged. The array probe is provided with a vibration insulating member 4 that is installed onto a transducer surface 33 to absorb the vibrations of the transducer surface, and an installation frame 5 for installing the vibration insulating member.
|Sensor positionig with non-dispersive guided waves for pipeline corrosion monitoring|
An ultrasonic sensor assembly for testing a pipe includes a first and second transducer rings attached to the pipe and spaced apart along a length of the pipe. The first transducer ring includes a plurality of transmitters for transmitting a wave, such as a non-dispersive guided wave.
|A friction testing positioning device|
A friction testing positioning device (10) comprises a first wheel (12) rotatably mounted around a first axis (14) at a first end section of a transmission arm (16), said transmission arm (16) being pivotably mounted around a second axis (18), at least one second wheel (20) rotatably mounted around a third axis (22) at a second end of said transmission arm (16) and a transmission means (24) connecting said first axis (14) and said third axis (22), wherein said at least one second wheel (20) engages a substructure (26) and said first wheel (12) and said at least one second wheel (20) are being arranged to rotate at different speeds of rotation. A first vertically adjustable displacement means (28) operates on said transmission arm (16) to rotate around said second axis (18) and to press said first wheel (12) into engagement with said substructure at a substantially constant vertical force.
|Transducer-actuator systems and methods for performing on-machine measurements and automatic part alignment|
Systems and methods for performing on-machine measurements and automatic part alignment, including: a measurement component operable for determining the position of a part on a machine; and an actuation component operable for adjusting the position of the part by contacting the part with a predetermined force responsive to the determined position of the part. The measurement component consists of a transducer.
|Non-articulated portable cmm|
A portable articulated arm coordinate measuring machine (aacmm) for measuring three-dimensional coordinates of an object in space is provided including a base and a positionable arm coupled to the base. The arm has at least one arm segment including a position transducer for producing a position signal.
|Method of cooling ultrasound treatment apparatus and ultrasound treatment apparatus using the same|
An ultrasound treatment apparatus includes a transducer configured to irradiate ultrasound waves onto an object, and a membrane disposed in an irradiation direction of the ultrasound waves and to form, with the transducer, a space in which a cooling fluid circulates. The apparatus further includes a first temperature sensor configured to measure a temperature of a skin of a patient contacting the membrane, and a second temperature sensor configured to measure a temperature of the transducer.
|Monitoring left ventricle end diastolic pressure|
Apparatus for remotely monitoring the left ventricle end diastolic pressure of a person includes an inflatable band for covering the artery of the person and applying a pre-determined pressure to the artery through the band. A pressure transducer in the inflatable band provides a pressure waveform signal representative of the pressure in the artery covered by the inflatable band.
|Separable beamforming for ultrasound array|
Ultrasonic imaging apparatus or techniques can include obtaining at least an approximation of samples of reflected ultrasonic energy and constructing a representation of an imaging plane within the tissue region. Such apparatus or techniques can include separately determining, for respective focusing locations respective first sums of at least approximated complex samples of reflected ultrasonic energy obtained via respective first lines of transducers, and separately determining, for the specified focusing location, a second sum of at least some the respective first sums of at least approximated complex samples of reflected ultrasonic energy, the second sum corresponding to a second line of transducers in the ultrasonic transducer array.
|Intraluminal imaging system|
The invention generally relates to devices and methods that allow an operator to obtain real-time images of a luminal surface prior to, during, and after an intraluminal procedure, including while an intraluminal tool is engaged with the luminal surface. In one embodiment, an imaging system of the invention includes a guidewire comprising a first imaging element and a catheter comprising a second imaging element and a lumen that is configured to slidably receive at least a portion of the guidewire within.
|Vibrational photoacoustic tomography using raman laser|
A method of noninvasively imaging tissue within a body includes irradiating the tissue using an imaging laser including a raman-based laser tuner, the radiation including a plurality of laser pulses, each having energy greater than 100 mj; receiving an acoustic signal generated by vibrational energy in the tissue, wherein the vibrational energy is a result of selective overtone excitation of molecules in the tissue by the radiation; and automatically converting the acoustic signal to an image representative of the tissue using a processor. An imaging system includes an imaging laser configured to irradiate tissue with a plurality of laser pulses using a raman-based laser tuner.
|Methods and systems for acoustic data transmission|
A method of communicating with an ingestible capsule includes detecting the location of the ingestible capsule, focusing a multi-sensor acoustic array on the ingestible capsule, and communicating an acoustic information exchange with the ingestible capsule via the multi-sensor acoustic array. The ingestible capsule includes a sensor that receives a stimulus inside the gastrointestinal tract of an animal, a bidirectional acoustic information communications module that transmits an acoustic information signal containing information from the sensor, and an acoustically transmissive encapsulation that substantially encloses the sensor and communications module, wherein the acoustically transmissive encapsulation is of ingestible size.
|Planetary gear pump|
A planetary gear pump comprising a central gear and a plurality of planet pairs provides a space efficient transducer between hydraulic and mechanical energy. When it is configured as a pump, a high flow rate is provided.
|Atomic layer deposition inverted passivated surface acoustic wave sensor for early detection of biofilm growth|
A surface acoustic wave (saw) biofilm sensor includes a transmitting electric to acoustic wave transducer defining an upper surface and a lower surface, a receiving acoustic wave to electric transducer defining an upper surface and a lower surface, a piezoelectric film layer defining an upper surface and a lower surface, and a passivation film layer defining an upper surface and a lower surface. Portions of the lower surface of the piezoelectric film layer are disposed on the upper surface of the transmitting electric to acoustic wave transducer and on the upper surface of the receiving acoustic wave to electric transducer, and the lower surface of the passivation film layer is disposed on the upper surface of the piezoelectric film layer such that the upper surface of the passivation film layer is configured to enable contact with a biofilm..
|Acoustical signal generator using two transducers and a reflector with a non-flat contour|
The present invention relates to an audio generator comprising, a first and a second transducer element, and the first transducer element has a first membrane having a surface which is non-flat, and a reflector, wherein the reflector has a surface with a non-flat contour and the reflector co-operating with directive guiding walls so as to lead and guide audio pressure waves to propagate in predetermined directions.. .
|High resolution x-ray imaging with thin, flexible digital sensors|
An x-ray sensor has a first x-ray transducer layer on a first side of the substrate, and a second x-ray transducer layer on a second side of the substrate opposite the first side of the substrate, and a sensor array of pixels between the first x-ray transducer layer and at least a portion of the substrate, the sensor array connected to the first and second x-ray transducer layers.. .
|Environment monitoring device in a motor vehicle and method for monitoring the environment using a correlation|
An environment monitoring device in a motor vehicle having a signal generating device for generating a transmitted signal, at least one ultrasonic transducer for converting electric oscillations into acoustic oscillations and/or vice versa, and an evaluation device which evaluates an electric received signal in order to determine distances to objects in an environment of the motor vehicle, wherein the signal generating device is linked to the at least one ultrasonic transducer so that the ultrasonic transducer emits an ultrasonic transmitted signal into the environment in accordance with the electric transmitted signal, and the evaluation device is connected to the at least one ultrasonic transducer or at least one further ultrasonic transducer in order to receive the electric received signal. Also disclosed is a method for monitoring an environment by using a cross-correlation..
|In-pixel ultrasonic touch sensor for display applications|
A video display is provided with a planar piezoelectric transmitter to transmit ultrasound signals, and a display panel including a plurality of pixels. Each pixel has a data interface to accept a video signal with a variable voltage associated with a range of light intensity values, and to supply a touch signal with a variable voltage derived from a range of reflected ultrasound signal energies.
|Saw device with heat efficient temperature controller|
A surface acoustic wave (saw) device comprising at least one heating element formed on the substrate; at least one temperature sensor having a first electric component on the substrate whose resistance varies with the temperature of the substrate and a second electric component whose resistance does not vary; and a temperature controller including an operational amplifier bonded in thermally conductive relationship to the substrate. The operational amplifier is responsive to the output of the temperature sensor to apply power to the heating element and thereby maintain the temperature of the substrate within a predetermined temperature range.
|Resonant transducer and manufacturing method of resonant transducer|
A resonant transducer includes a resonator, a resonator electrodes connected to an end part of the resonator, at least one fixed electrode arranged in the vicinity of the resonator, and a buried part formed between the fixed electrode and the resonator electrode. The resonator, the resonator electrodes and the fixed electrode are formed by the same active layer on a substrate..
|Medical storage cabinet with rfid inventory|
A medication and/or medical supplies storage cabinet of all-steel construction has an rfid transducer or reader with an antenna array (i.e., an antenna or series of antennas) carried on a vertical elevator at the rear of the cabinet's metal shelves and drawers. The metal shelves, sides and back of the cabinet define successive compartments in which rfid-tagged item are stored.
|Heat exchange in fluid degassing|
In one variation, a temperature-maintenance device includes a heater (1016) and is placeable in a circulation loop of an ultrasound transducer coupling bolus (1076), for degassing circulating liquid of the loop and for operating the heater for performing temperature control of the liquid. A temperature setpoint, such as a normal body temperature, for the liquid at the bolus may be entered.
|Deployable ultrasonic flow meter that is inserted through a gate valve slot, method and apparatus|
A frame that is inserted into a gate valve slot which accesses a channel through which fluid flows so an ultrasonic flowmeter can measure the fluid flow through the channel. The frame includes a first arm axle that fits into the slot.
|Scanning acoustic microscope with an inverted transducer and bubbler functionality|
A scanning acoustic microscope includes a transducer mounted in a cup below a particular elevation capable of producing ultrasonic energy and a coupling fluid source disposed below the particular elevation, which is configured to introduce coupling fluid into the cup. Ultrasonic energy is directed upwardly through coupling fluid disposed between and contacting the transducer and a first surface of a part to be inspected.
|Three-mode sensor for determining temperature, level, and concentration of a fluid|
A three-mode ultrasonic sensor for determining temperature, level, and/or concentration of a fluid. In one embodiment, the sensor includes a target positioned at a level; a controller, and a transducer electrically connected to the controller.
|Ivus system with rotary capacitive coupling|
An imaging system comprises a catheter having a lumen, a rotatable imaging probe within the catheter lumen including a distal transducer and first and second conductors coupled to the transducer, and a coupler that couples the rotatable first and second conductors to non-rotatable third and fourth conductors, respectively. The coupler includes a rotary capacitive coupler..
|Ultrasound image diagnostic device|
An ultrasound image diagnostic device including: a transducer to output transmission ultrasound toward a subject by a drive signal and also to output a reception signal by receiving reflection ultrasound from the subject; a noise output section in which when the transducer receives the reflection ultrasound, a voltage containing noise is applied to the transducer to amplify the reception signal by a stochastic resonance phenomenon; a harmonic extracting section to extract a harmonic component from the reception signal; and an image processing section to generate ultrasound diagnostic image data of an interior of the subject based on the harmonic component extracted by the harmonic extracting section, wherein the noise output section applies a voltage containing noise such that the harmonic component is amplified by the stochastic resonance phenomenon to the transducer.. .
|Ultrasound transducer direction control|
Disclosed are embodiments of devices and methods for imaging the inside of a body part, such as a blood vessel. In particular embodiments, a catheter has a chamber within which is a transducer mounted to a pivot mechanism, a motor for turning the transducer, and a coil for providing a pivot force to the transducer.
|Reciprocating ultrasound device|
A device for internal ultrasound procedures includes a motor which rotates a drive shaft and an ultrasound transducer. A gearing assembly provides reciprocating rotational motion from a unidirectional motor.
|Method for focused acoustic computed tomography (fact)|
A method for acoustic tomography within a patient may include generating a focused ultrasonic signal using a transducer is provided; the ultrasonic signal forming a path within the patient. The method includes directing the ultrasonic signal on a spot within the patient; scanning the spot in a predetermined pattern about a volume within the patient; receiving an ultrasonic echo in the transducer; converting the ultrasonic echo into a voltage; selecting a frequency band from the voltage; amplifying the voltage in the selected frequency band with a processing circuit; and generating an image of the volume within the patient structure utilizing the amplified voltage.
|Ultrasound based method and apparatus to determine the size of kidney stone fragments before removal via ureteroscopy|
A transducer is used to send an ultrasound pulse toward a stone and to receive ultrasound reflections from the stone. The recorded time between a pulse that is reflected from the proximal surface and a pulse that is reflected either from the distal surface of the stone or from a surface supporting the stone is used to calculate the stone size.
|Multi-layer coating for optoacoustic probe|
Disclosed is an optoacoustic probe with a coated transducer assembly. The probe includes a transducer assembly with a multi-layer coating on the active end thereof.
|Intraluminal imaging system|
The invention generally relates to devices and methods that allow an operator to obtain real-time images of a luminal surface prior to, during, and after an intraluminal procedure, including while an intraluminal tool is engaged with the luminal surface. In one embodiment, an imaging system of the invention includes a first elongate member that includes at least one first imaging element and a second member that includes at least one second imaging element.
|Piezoelectric-based, self-sustaining artificial cochlea|
Piezoelectric transducer arrays and methods of making the same are discussed. Such an array can include a piezoelectric film comprising a plurality of segments.
|Low vibration linear motor systems|
A portable fuel cell system includes a fuel cell having a fluid path, a pump having a pumping chamber disposed in the fluid path and a mechanical input, an electric motor having a power signal input and having an oscillatory mechanical output coupled to the mechanical input, the mechanical output having unwanted vibration primarily at a first drive frequency of a power signal, a spring and mass assembly coupled to the mechanical output so as to vibrate out of phase with, and to reduce the unwanted vibration of, the mechanical output at the drive frequency, a vibration transducer physically coupled to the mechanical output and having a vibration transducer signal output, and an electrical control system having an input coupled to receive the vibration transducer signal output and having a control output coupled to the power signal input.. .
|Bone conduction device|
A bone conduction device including an external component, the external component comprising a sound processor and transducer, the transducer configured to generate mechanical forces, and the external component configured for positioning behind a recipient's ear such that the mechanical forces are transmitted from the external component to a recipient's bone to generate a hearing percept via bone conduction.. .
|System and method for fitting of a hearing device|
The invention relates to system and method for configuring a hearing device (100) with an external configuration unit (101), the method comprising the steps of: a) processing at least two sound recordings in the external processing unit (104′) with different parameter settings (105′a, 105′b), b) combining them into one joint signal, c) feeding the joint signal to the hearing device's output transducer (107), bypassing the rest of the hearing device (100), d) emitting the joint signal, e) letting the user (111) choose one of the sound recordings that fits his/her requirements best, f) repeating steps a) to e) with varying parameter settings, g) transmitting a chosen parameter setting to the hearing device (100), wherein in step a) the sound recordings to be processed are chosen according to the situation the hearing device (100) will be used for or the specific hearing impairment of a user (111) of the hearing device (100).. .
|System for fitting audio signals for in-use ear|
A system and method are provided for automatic fitting of all audio signals according to the ear in which a user is using to receive audio signals from a host device. The device may comprise an inquirer configured to query a host device for an in-use audio producing transducer; an electronic mechanism configured to identify an ear which a user is using to receive audio signals from a host device, based on the in-use audio producing transducer; and a notifier configured to instruct the host device, based on the identified ear, to output a channel of audio signals to the in-use audio producing transducer.
|Non-contact measurement device|
A portable coordinate measuring machine for measuring the coordinates of an object in space is provided including a manually positionable articulated arm portion having a plurality of connected arm segments that include position transducers that provide position signals. A probe assembly connected to an arm segment includes a non-contact measurement device having a projector and a camera separated by a baseline distance.
|Multi-transducer waveguide arrays|
Systems and related methods providing for touch sensors having segmented reflective arrays including waveguide cores are discussed herein. A touch sensor may include a substrate configured to propagate surface acoustic waves.
|Thin profile user interface device and method providing localized haptic response|
Electromechanical polymer (emp) actuators are used to create haptic effects on a user interface deface, such as a keyboard. The keys of the keyboard may be embossed in a top layer to provide better key definition and to house the emp actuator.
|Differential current sensor|
The invention relates to a differential current sensor for measuring a differential current (Δi) between an electric current (ih) through a delivery conductor (h) and an electric current (ir) through a return conductor (r), with two low-ohmic current-measuring resistors (rh, rl) for measuring the currents (ih, ir) in the delivery conductor (h) and return conductor (r) and two measuring devices (meh, mel) with a measuring transducer for measuring the voltage drops (uh, ul) over the two current-sense resistors (rh, rl) in each case, and also with two voltage references (urefh, urefl) for calibrating the measuring devices (meh, mel). It is suggested that the two measuring transducers successively measure both the voltage drop (uh) over the respective current-sense resistor (rh) and the associated voltage reference (urefh, urefl)..
|Mems process and device|
A method of fabricating a micro-electrical-mechanical system (mems) transducer comprises the steps of forming a membrane on a substrate, and forming a back-volume in the substrate. The step of forming a back-volume in the substrate comprises the steps of forming a first back-volume portion and a second back-volume portion, the first back-volume portion being separated from the second back-volume portion by a step in a sidewall of the back-volume.
|Sound transducer and microphone using same|
Provided is an acoustic transducer including: a semiconductor substrate; a vibrating membrane, provided above the semiconductor substrate, including a vibrating electrode; and a fixed membrane, provided above the semiconductor substrate, including a fixed electrode, the acoustic transducer detecting a sound wave according to changes in capacitances between the vibrating electrode and the fixed electrode, converting the sound wave into electrical signals, and outputting the electrical signals. At least one of the vibrating electrode and the fixed electrode is divided into a plurality of divided electrodes, and the plurality of divided electrodes outputting the electrical signals..