174results about "Electrothermic-effect transistor" patented technology

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 speaker includes a thermoacoustic module, an amplifier circuit board, and a frame. The thermoacoustic module includes a sound wave generator, at least one first electrode and at least one second electrode. The at least one first electrode and the at least one second electrode are electrically connected to the sound wave generator. The sound wave generator includes a carbon nanotube structure. The amplifier circuit board is electrically connected to the carbon nanotube structure by the at least one first electrode and at least one second electrode. The frame secures the thermoacoustic module and the amplifier circuit board.

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 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 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 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.

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 thermoacoustic device includes a sound wave generator, a signal element and a support element. The sound wave generator includes a carbon nanotube structure. The signal element is configured to transmit a signal. The carbon nanotube structure is configured to receive the signal and generate a sound wave. The support element includes a metal substrate and an insulating layer located on the metal substrate. The insulating layer is sandwiched between the metal substrate and the sound wave generator. The thermoacoustic device further includes two electrodes electrically connected to the carbon nanotube structure.

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.