Methods, systems, and apparatus, including computer programs encoded on computer storage media, for selecting distributed mode loudspeaker electrodes using an output frequency. One of the methods includes determining, for a piezoelectric transducer, a subset of frequencies, from a range of frequencies, at which to output a sound; selecting, based on the subset of frequencies, one or more electrode pairs from two or more electrode pairs included in the piezoelectric transducer to generate the sound; and providing, by a drive module connected to each of the two or more electrode pairs, current to each of the selected one or more electrode pairs to cause the piezoelectric transducer to generate a force that, when provided to a load, causes the load to generate the sound within the subset of frequencies.

Disclosed is a display device that includes a display panel, sound generating actuators including a first sound generating actuator in a first area of the display panel and a second sound generating actuator in a second area of the display panel, the first and second sound generating actuators configured to vibrate the display panel to generate sound, and a partition between the first sound generating actuator and the second sound generating actuator.

A transducer is disclosed which includes lead zirconate titanate (PZT) particles mixed with graphene nanoplatelets (GNPs) in a flexible substrate aligned in a first direction, forming a transducer subsystem, a first conductive protective electrode having a width and a length providing an electrical connectivity to an external circuit, a second conductive protective electrode having the width and the length providing an electrical connectivity to the external circuit, wherein the transducer subsystem is sandwiched between the first and second conductive protective electrodes.

A transducer includes an acoustic reflector, an acoustic coupler and one or more thermoacoustic frames. The acoustic coupler is disposed proximate to an output of the transducer and each of the thermoacoustic frames is disposed between the acoustic reflector and the acoustic coupler. The thermoacoustic frames, the acoustic reflector and the acoustic coupler form a resonator with each of the thermoacoustic frames configured to emit a broadband acoustic signal in response to receiving electrical energy. Additionally, the resonator is configured to emit a narrowband acoustic signal at the transducer output in response to receiving the broadband acoustic signal. A method includes adjusting a frequency of the narrowband acoustic signal by controlling a spacing between the thermoacoustic frames and one or more components of the resonator. Thermoacoustic device embodiments capable of resonant emission of intense ultrasound radiation generated by sheets of multi-walled carbon nanotubes (MWNT) are also disclosed.

The present invention relates to a manufacturing method for a diamond-like carbon diaphragm, comprising the steps of: placing a base material in the air; a step of depositing a composite diamond-like carbon diaphragm comprises: importing a carbon-containing gas from one end of an atmospheric pressure plasma chemical vapor deposition device, importing a main gas from the other end of the atmospheric pressure plasma chemical vapor deposition device; bringing the ionized carbon-containing gas out of the atmospheric pressure plasma chemical vapor deposition device by the main gas and depositing the same on the surface of the base material to form a composite diamond-like carbon diaphragm; a step of forming a diamond-like carbon vibrating diaphragm comprises: cutting from the composite diamond-like carbon diaphragm a diamond-like carbon vibrating diaphragm having the required diameter, forming a diamond-like carbon vibrating diaphragm having the required shape by means of a compressing process.

A diaphragm structure is used for an audio signal output device. The diaphragm structure includes a film substrate, a polymer fiber structure and a thin film metallic glass. The film substrate includes a first surface and a second surface opposite to the first surface. The polymer fiber structure is combined with the first surface of the film substrate. The thin film metallic glass is formed on at least a part of the second surface of the film substrate.

An acoustic sensor comprises a sensing head comprising an optical fiber having a tip. A graphene diaphragm is disposed on the tip and is configured to vibrate in response to an acoustic signal. A fiber laser is optically coupled to the sensing head. The fiber laser comprises a first set of fiber Bragg gratings and a second set of fiber Bragg gratings. A gap is present between the first set and the second set of fiber Bragg gratings. The fiber laser is configured to generate a sensing optical signal having a first intensity in response to an excitation optical signal, the sensing optical signal impinging on the graphene diaphragm such that a feedback optical signal is reflected from the graphene diaphragm towards the fiber laser and has and has a second intensity modulated by the vibration of the graphene diaphragm that corresponds to the acoustic signal.

An MEMS microphone device and an electronics apparatus are provided. The MEMS microphone device comprises: a substrate; a MEMS microphone element placed on the substrate; a cover encapsulating the MEMS microphone element together with the substrate; and an acoustic port for the MEMS microphone element, wherein a compliant membrane is provided to seal the acoustic port, and the membrane has a mechanical stiffness lower than that of the diaphragm of the MEMS microphone element.

Disclosed is a display device that includes a display panel, sound generating actuators including a first sound generating actuator in a first area of the display panel and a second sound generating actuator in a second area of the display panel, the first and second sound generating actuators configured to vibrate the display panel to generate sound, and a partition between the first sound generating actuator and the second sound generating actuator.

The purpose of the present invention is to provide a glass sheet composite having satisfactory acoustic performance. The present invention relates to a glass sheet composite including a diaphragm that is vibrated by a vibrator, and a support member that is attached along an edge portion of the diaphragm to support the diaphragm, in which the diaphragm includes at least one glass sheet, and is supported on the support member through a fixing part that fixes the edge portion of the diaphragm to the support member, and a vibration-permitting part that permits vibration of the diaphragm.