179results about "Electrothermic-effect transistor" patented technology

A thermally induced sound wave generating device comprising a thermally conductive substrate, a head insulation layer formed on one surface of the substrate, and a heating element thin film formed on the heat insulation layer and in the form of an electrically driven metal film, and wherein when the heat conductivity of the thermally conductive substrate is set as αs and its heat capacity is set as Cs, and the thermal conductivity of the beat insulation layer is set as αI and its heat capacity is set as CI, relation of 1 / 100≧αICI / αSCS and αSCS≧100×106 is realized. This is a new technical means capable of greatly improving the function of a pressure generating device based on thermal induction.

A pressure wave generator is provided, which has excellent output stability over time. This pressure wave generator comprises a substrate, a heat generating layer, and a heat insulating layer formed between the substrate and the heat generating layer. A pressure wave is generated in a surrounding medium (air) by a change in temperature of the heat generating layer, which is caused upon energization of the heat generating layer. The heat insulating layer comprises a porous layer and a barrier layer formed between the porous layer and the heat generating layer to prevent diffusion of reactive substances such as oxygen and moisture in the air and impurities into the porous layer. By the formation of the barrier layer, it is possible to prevent a reduction in output of the pressure wave generator caused by a change over time of the porous layer.

An apparatus includes a headphone. The headphone includes at least one housing; and at least one sound wave generator disposed in the housing. The sound wave generator includes at least one carbon nanotube structure.

A thermoacoustic generating apparatus (1) is for generating acoustic waves by temperature modulation of solids, and is provided with: a thermoelement layer (12); a first electrode layer (11), laminated on one surface of the thermoelement layer; and a second electrode layer (13), laminated on the other surface of the thermoelement layer.

Even when compression stress is generated because a volume of a thermal insulation layer 2 is expanded due to oxidized by oxygen in the air, occurrence of cracks and fractures of the thermal insulation layer and a heating conductor 3 caused by the cracks are prevented by dispersing the compression stress. A pressure wave generator comprises a substrate 1, the thermal insulation layer 2 of porous material which is formed on a surface of the substrate 1 in thickness direction, and the heating conductor 3 of thin film formed on the thermal insulation layer 2, and generates pressure waves by heat exchange between the heating conductor 3 and a medium. When a thickness at the center of the thermal insulation layer 2 in width direction W is used as a reference thickness, and it is assumed that distribution of thickness of thermal insulation layer in the width direction is averaged with the reference thickness, porosity in an outer peripheral portion of the thermal insulation layer is made smaller than porosity in the center portion. By making the porosity in the outer peripheral portion of the thermal insulation layer 2 smaller, a number of immovable points on the outer periphery of the thermal insulation layer 2 restricted by the substrate 1 is increased and the positions of them are dispersed, so that the compression stress compressed in the outer peripheral portion of the thermal insulation layer 2 can be dispersed.

A loudspeaker includes an enclosure and at least one sound wave generator disposed in the enclosure. The sound wave generator includes at least one carbon nanotube structure. The carbon nanotube structure is capable of converting electrical signals into heat. The heat is transferred to a medium and causes a thermoacoustic effect.

A sound wave generator that includes a carbon nanotube structure. The carbon nanotube structure produces sound by means of the thermoacoustic effect.

A MEMS transducer for interacting with a volume flow of a fluid includes a substrate including a cavity, and an electromechanical transducer connected to the substrate in the cavity and including an element deformable along a lateral movement direction, wherein a deformation of the deformable element along the lateral movement direction and the volume flow of the fluid are causally related.

A thermoacoustic device includes a sound wave generator and a signal input device. The sound wave generator includes a composite structure. The composite structure includes a carbon nanotube film structure and a graphene film. The carbon nanotube film structure includes a number of carbon nanotubes and micropores. The graphene film is located on a surface of the carbon nanotube film structure, and covers the micropores.

In one aspect, the present invention provides nano-scale heaters, such as nano-scale thermoacoustic loudspeakers comprising suspended metal nanobridges prepared using atomic layer deposition (ALD). The loudspeakers of the invention are capable of producing audible sound when stimulated with an electrical current or other energetic stimulus. In another aspect, the present invention provides methods of preparing and using such nanodevices.

A sound wave generator includes a carbon nanotube structure. The carbon nanotube structure includes of one or more carbon nanotube films. Each carbon nanotube film includes a plurality of carbon nanotubes entangled with each other. The one or more carbon nanotube films produces sound by means of the thermoacoustic effect.

The invention relates to a device for generating or recovering acoustic energy, including:at least one first deformable cavity (20) for receiving an ambient atmosphere, made in a first substrate, delimited by at least one wall including at least one mobile or deformable wall (25), and a means for making the cavity communicate with an ambient atmosphere,a means (24, 24′, 241, 24′1) for actuating a displacement or deformation, in the plane of the sensor, or to recover energy resulting from a displacement or deformation, in the plane of the sensor, of said mobile or deformable wall.

A thermoacoustic device includes at least one first electrode, at least one second electrode, a thermoacoustic element, a base and a plurality of fins. The at least one second electrode is spaced from the at least one first electrode. The thermoacoustic element is electrically connected with the at least one first electrode and the at least one second electrode. The base supports the thermoacoustic element and the at least one first electrode and the at least one second electrode. The fins are in thermal engagement with the base.

A thermoacoustic device includes a sound wave generator and a signal input device. The sound wave generator includes a graphene layer. The graphene layer includes at least one graphene. The signal input device inputs signals to the sound wave generator.

A method of producing sound waves. The method includes causing a carbon nanotube structure heat, and thus causing the thermoacoustic effect.

A thermoacoustic device includes a signal device and a sound wave generator. The sound wave generator includes a base structure and a conductive material located on the base structure. The base structure includes nano-scale elements. The signal device is capable of transmitting an electrical signal to the sound wave generator. The sound wave generator is capable of converting the electrical signal into heat. The heat is capable of being transferred to a medium to cause a thermoacoustic effect.

A thermoacoustic device includes a thermoacoustic module and a frame. The thermoacoustic module includes a sound wave generator, at least one first electrode and at least one second electrode. The sound wave generator includes at least one carbon nanotube structure. The at least one first electrode and the at least one second electrode are electrically connected to the sound wave generator. The frame secures the thermoacoustic module.

A sound wave generator includes a carbon nanotube structure. The carbon nanotube structure includes one or more drawn carbon nanotube films. The one or more drawn carbon nanotube films produce sound by means of the thermoacoustic effect.

A room heating device includes a supporting body, a thermoacoustic element, a first electrode and a second electrode. The thermoacoustic element is disposed on the supporting body. The first electrode and the second electrode are connected to the thermoacoustic element. The first electrode is spaced apart from the second electrode.

A flexible thermoacoustic device includes a soft supporter and a sound wave generator. The sound wave generator is located on a surface of the softer supporter. The sound wave generator includes a carbon nanotube structure. The carbon nanotube structure includes a plurality of carbon nanotubes combined by van der Waals attractive force.

A diaphragm includes a carbon nanotube film structure and an amorphous carbon structure composited with the carbon nanotube structure to form a stratiform composite structure. The carbon nanotube film structure defines a plurality of micropores therein. The amorphous carbon structure comprises a plurality of amorphous carbon particles received in the micropores.

The present invention relates to a thermoacoustic device that includes an acoustic element. The acoustic element includes a substrate, a plurality of microspaces, and a metal film. The metal film is located above the substrate. A plurality of microspaces is defined between the substrate and the metal film. The metal film is partially suspended above the substrate.

The invention relates to a hearing device 1 adapted for placement in, at or near a person's ear, the hearing device 1 comprising a microphone 2, a receiver 4 and a signal conditioning means 3 connected to the microphone 2 and to the receiver 4, the microphone 2 being arranged for receiving acoustical signals from the person's surroundings 7 and converting these acoustical signals into electrical signals and the receiver 4 being arranged for converting electrical signals into acoustical signals and transmitting these into the ear's ear canal 13. The object of the present invention is to provide a small, light-weight hearing device 1. The problem is solved in that the receiver 4 comprises a thermoacoustical transducer 18, which allows for a receiver 4 which may take up less space in the hearing device 1 and may have a smaller weight. This has the advantage of allowing the hearing device 1 to be small and light-weight, thus providing an improved wearing comfort. The invention may e.g. be used in hearing aids for compensating a person's loss of hearing capability.

A bobbin includes a carbon nanotube film structure and an amorphous carbon structure. The carbon nanotube film structure defines a number of micropores therein. The amorphous carbon structure is composited with the carbon nanotube structure. The amorphous carbon structure comprises a number of amorphous carbon particles received in the micropores.

A thermoacoustic device includes a substrate, a sound wave generator and a signal device. The substrate has a net structure and includes a number of first wires and a number of second wires. The first wires and the second wires are crossed with each other. Each of the first wires includes a composite wire. The composite wire includes a carbon nanotube wire structure and a coating layer wrapping the carbon nanotube wire structure. The sound wave generator is located on a surface of the substrate and includes a graphene layer including at least one graphene. The signal input device is configured to input signals to the sound wave generator.

A thermoacoustic device includes a substrate, a sound wave generator and a signal device. The substrate has a net structure and includes a number of first wires and a number of second wires. The first wires and the second wires are crossed with each other. Each of the first wires includes a composite wire. The composite wire includes a carbon nanotube wire structure and a coating layer wrapping the carbon nanotube wire structure. The sound wave generator is located on a surface of the substrate and includes a graphene layer including at least one graphene. The signal input device is configured to input signals to the sound wave generator.