284results about "Piezoelectric/electrostrictive resonant transducers" patented technology

The present invention is a method for adjusting the resonant frequency of a mechanical resonator whose frequency is dependent on the overall resonator thickness. Alternating selective etching is used to remove distinct adjustment layers from a top electrode. One of the electrodes is structured with a plurality of stacked adjustment layers, each of which has distinct etching properties from any adjacent adjustment layers. Also as part of the same invention is a resonator structure in which at least one electrode has a plurality of stacked layers of a material having different etching properties from any adjacent adjustment layers, and each layer has a thickness corresponding to a calculated frequency increment in the resonant frequency of the resonator.

A piezoelectric electroacoustic transducer includes a substantially rectangular piezoelectric diaphragm having electrodes and flexurally vibrating in response to application of an alternating signal between the electrodes, a resin case having a supporting member disposed inside sidewalls of the case for supporting the diaphragm, terminals insert-molded in the case so as to have internal connections exposed in the supporting member and external connections exposed on the external surface of the case, a conductive adhesive for electrically connecting the electrodes of the diaphragm to the internal connections of the terminals, an elastic sealant for sealing a gap between the external periphery of the diaphragm and the internal periphery of the case, and a lid plate for closing an opening of the case. The terminals are pressed terminals, which are made by punching a metallic plate so that a flash-producing surface is to be the lower surface, and flashes on both respective side-edges of the internal connections are embedded inside the supporting member of the case so that the top surfaces of the internal connections are flush with the surface of the supporting member, and the external connections of the terminals are bent toward the bottom surface of the case via the side surfaces thereof.

A mobile phone (100) detects at least a direction of an utterance position of a user from the voice input to a plurality of microphones (121,122) and controls an output direction of a voice out of a speaker unit (110) to match the detected utterance position. Accordingly, it is possible to provide sound with sufficient volume only for a specific user without causing noise in the neighborhood. The microphones may form a matrix together with piezoelectric vibrators that form a speaker unit, or may be formed separately from the speaker unit.

An electroacoustic transducer having one end portion of a first piezoelectric element and one end portion of a second piezoelectric element fixed to a frame such that the first piezoelectric element and the second piezoelectric element are supported by the frame in an opening of the frame in the cantilever manner. A flexible thin film is bonded to the frame and the first and second piezoelectric elements so that it covers at least a gap between each of the piezoelectric elements and the frame. The other end portions of the piezoelectric elements are free end portions, and face each other with a gap therebetween.

In a piezoelectric speaker, an acoustic diaphragm is thicker than a piezoelectric thin film and is formed of a more flexible and higher elasticity material than the piezoelectric thin film, thereby greatly improving output sound pressure in a low frequency band and reducing sound distortion. Further, the piezoelectric thin film is attached to the acoustic diaphragm in an inclined structure in which the piezoelectric thin film is horizontally turned from the acoustic diaphragm, thereby preventing a standing wave from being created by structural symmetry and minimizing sound distortion.

The invention discloses a piezoelectric speaker based on a piezoelectric cantilever beam, belonging to the technical filed of piezoelectricity. The piezoelectric speaker is structured by bonding an upper layer piezoelectric ceramic piece and a lower layer piezoelectric ceramic piece of opposite polarization directions at both sides of a middle layer fiber sheet, thereby forming a piezoelectric cantilever beam; one end of the piezoelectric cantilever beam is fixed with an external frame so as to form a fixed end from which electrodes are led out; the movable end of the piezoelectric cantilever beam is connected with a vibration sheet by a link block with a damp function; and the vibration sheet is bonded to the external frame through a vibration film. The vibration sheet can serve as the main medium for driving air around the speaker and also the counter weight of the speaker, can reduce the first-order resonance frequency of the speaker effectively, and improve the effect of low pitch replay. The piezoelectric speaker provided by the invention has the characteristics of low resonance frequency, simple vibration mode and large vibration range and the like, and has the advantages of good low pitch performance, stable sound pressure output and high sound output and the like compared with a conventional surface mount type piezoelectric speaker.

The present invention achieves the wideband operation of a bolted Langevin-type echo sounder transducer by enabling low frequency operation with securing a sound pressure level above a certain level without changing the external dimensions of the echo sounder transducer. This is an echo sounder transducer includes a Langevin-type vibrator having a front mass and a rear mass, and a cylindrical active vibrator which is sandwiched between the front mass and rear mass, a bend vibrator constituted of a diaphragm arranged in an acoustic radiation surface section of the front mass of the Langevin-type vibrator, and a disc type active vibrator fixed to the diaphragm. This has such structure that a slit, communicating from an outer peripheral side face toward an axial center, is provided on the circumference in the side of the lower portion of the front mass of the Langevin-type vibrator toward the rear mass.

A vibratory apparatus including a lever arm apparatus including a living hinge, wherein the vibratory apparatus is configured such that at least a portion of the lever arm moves about the living hinge when the vibratory apparatus is generating vibrations.

A piezoelectric microphone, a speaker, a microphone-speaker integrated device and a manufacturing method thereof are provided. The microphone-speaker integrated device includes a silicon substrate and an insulating layer deposited on the silicon substrate; a piezoelectric plate formed on the insulating layer; and a mating electrode formed on the piezoelectric plate. The mating electrode is patterned with a polarity arrayed in series.

Disclosed are an apparatus and method of processing an audio signal to optimize audio for a room environment. One example method of operation may include recording the audio signal generated within a particular room environment and processing the audio signal to create an original frequency response based on the audio signal. The method may also include identifying a target sub-region of the frequency response which has a predetermined area percentage of a total area under a curve generated by the frequency response, determining whether the target sub-region is a narrow energy region, creating a filter to adjust the frequency response, and applying the filter to the audio signal.

A speaker device for emitting subsonic, sonic or ultrasonic compression waves comprising a generally hollow drum, a rigid emitter plate attached to the drum, and a plurality of apertures formed within the plate which are covered by a thin piezoelectric film disposed across the emitter plate. A pressure source is coupled to drum for developing a biasing pressure with respect to the thin film at the apertures to distend the film into an arcuate emitter configuration capable of constricting and extending in response to variations in the applied electrical input at the piezoelectric film to therapy create a compression wave in a surronding environment. Parametric ultrasonic frequency input is supplied to the piezoelectric film to propagate multiple ultrasonic frequencies having a difference component corresponding to the desired subsonic, sonic or ultrasonic frequency range.

A sound producing device includes at least one air pulse generating element. Each of the at least one air pulse generating element includes a membrane, a first air chamber and at least one opening, wherein a chamber pressure exists in the first air chamber. The membrane is actuated to change the chamber pressure of the first air chamber to generate a plurality of air pulses, the air pulses are propagated through the at least one opening, the air pulses produce a non-zero offset in terms of sound pressure level, and the non-zero offset is a deviation from a pressure value of an ambient pressure outside the sound producing device.

An electroacoustic transducer has a housing, piezoelectric speaker, dynamic speaker, and support member. The piezoelectric speaker includes a vibration plate having a first surface and a second surface on the opposite side of the first surface, as well as a piezoelectric element joined to at least one of the first surface and second surface, and divides the interior of the housing into a first space facing the first surface and a second space facing the second surface. The dynamic speaker is placed in the first space. The support member is constituted by a part of the housing or by a member different from the housing, has a supporting part facing the first surface or second surface, and supports the periphery of the first surface or second surface with the supporting part.

Methods and apparatus for improving the acoustical performance associated with a speaker, such as a piezoelectric speaker, are disclosed. According to one aspect, an apparatus includes a substrate, a can mounted on the substrate, and a piezoelectric speaker arrangement. The piezoelectric speaker arrangement is at least partially mounted on the can. In one embodiment, the substrate is a printed circuit board (PCB) and the can is an electromagnetic interference (EMI) shielding can.

An ultrasonic emitter comprises a support member operable to support an ultrasonic emittive material. The support member includes a plurality of support ribs. The ultrasonic emittive material is coupled to upper portions of the support ribs so as to be carried by the support member. A protective screen has a plurality of apertures formed therein, the protective screen being in contact with the ultrasonic emittive material atop the support ribs such that the spacing between the ultrasonic emittive material and the protective screen is substantially zero atop the support ribs.

A method of manufacturing composite structures, or composite substrates, for a Surface Acoustic Wave (SAW) device are provided. In one embodiment of the present disclosure, a piezoelectric substrate is provided. A supporting substrate is formed over a first surface of the piezoelectric substrate. The first surface of the piezoelectric substrate may be unpolished. A second surface of the piezoelectric substrate is then processed to a desired thickness and polished. SAW device components such as, for example, interdigitated transducers (IDTs) and reflectors are then formed on the polished surface of the piezoelectric substrate. The supporting substrate may be formed using any desired type of deposition or growth process.

A thin film piezoelectric element used in an actuator unit for fine positioning, and its manufacturing method, the manufacturing method including laminating two piezoelectric thin films held between electrode layers by using adhesive, and selectively removing only the second substrate in order to process the thin films remaining on the first substrate into a plurality of separated structures. After that, an insulating layer and external connecting electrode are formed to cover the exposed surface of the structure, thereby forming a plurality of thin film piezoelectric elements. Resin is applied to cover the thin film piezoelectric element, and a temporary fixing substrate is bonded thereto, and after selectively removing the first substrate, the temporary fixing substrate is separated, and the resin is removed from the piezoelectric element surface in order to separate the plurality of thin film piezoelectric elements.

An auto voice trigger method and an audio analyzer employing the same are provided. The auto voice trigger method includes: receiving a signal by at least one resonator microphone included in an array of a plurality of resonator microphones with different frequency bandwidths; analyzing the received signal and determining whether the received signal is a voice signal; and when it is determined that the received signal is the voice signal, waking up a whole system to receive and analyze a wideband signal.

A speaker has a substantially reduced overall size while producing a complete low frequency sound range at high output amplitude. The speaker includes a main body having open sections at both ends thereof. A sounding body pinched by ringed first dampers is secured to each of the open sections of the main body so that the inside of the main body is kept air-tight. A first opening is provided at the middle part of the side of the main body. Lid members are secured on the outside of the two sounding bodies via a ringed second damper so as to keep the inside of the lid member air-tight. A second opening is created around the middle of the bottom of each of the lid members. A disc-like membrane is secured to the second dampers such that the lid members cover the membranes and cover the open section of the main body to keep the inside of the lid members air-tight.

A sound and vibration spectrum analyzing device includes a plurality of resonators having different center frequencies, the plurality of resonators being configured to acquire a spectrum of sound and vibration. The sound and vibration spectrum analyzing device is configured to analyze the spectrum of sound and vibration, based on a first frequency signal of a first resonance mode and a second frequency signal of a second-order or higher resonance mode of at least some of the plurality of resonators.