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Thermophone device

A sounding device, a technology of thermally induced sound, applied in the direction of sensors, electrical components, sensor parts, etc., can solve the problems of no practical application, narrow sounding frequency range, low sounding intensity, etc., to achieve high practicability and reliability, Fast heat exchange and small thermal hysteresis

Active Publication Date: 2012-01-04
TSINGHUA UNIV
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  • Abstract
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Problems solved by technology

However, due to the limitations of the technical level at that time, the thickness of the metal platinum sheet can only be 0.7 microns, so its unit heat capacity is relatively large, and its sound frequency is only 4 kHz.
Therefore, the occurrence frequency of this sounding element 12 was relatively narrow at that time, and the sounding intensity was low, resulting in no practical application for a long time
[0005] For traditional metal sheets, the heat capacity per unit area is large, the sound frequency range is narrow, and the sound intensity is weak

Method used

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Embodiment Construction

[0015] The sound generating device of the embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0016] see figure 2 , the embodiment of the present invention designs a sounding device 20, which includes a signal input device 22, a graphene film structure 24, a substrate structure 26, a first electrode 28 and a second electrode 30 Composed of sound components. The first electrode 28 and the second electrode 30 are arranged at two ends of the graphene film structure 24 at intervals, and are electrically connected to the signal input device 22 . The substrate structure 26 is used to support and protect the graphene film structure 24 , the first electrode 28 and the second electrode 30 .

[0017] The graphene film structure 24 in the sound emitting element includes at least one layer of graphene film, and one of double-layer graphene film and multi-layer graphene film can also be used. If the graphene film structur...

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Abstract

The invention relates to a thermophone device, which belongs to the technical field of sound-producing devices. The thermophone device comprises a sound-producing element and a signal input device connected with the sound-producing element. The thermophone device is characterized in that the sound-producing element comprises at least one grapheme film structure; and the signal input device is used for inputting a signal to the grapheme film structure, so that the grapheme film structure can be used for changing the density of an ambient medium and sending out sound wave. The thermophone device has no mechanical vibration and can be used for generating high sound pressure output within a frequency range of 10 to 0.1 million of Hz. The invention has the advantages of high reliability, flexibility, transparency, low cost and high performance and can be widely applied to electronic fields of mobile phones, MP3 (Moving Picture Experts Group Audio Layer-3), MP4 (Mobile Pentium 4), televisions, computers, ultrasonic imaging, ranging systems and the like.

Description

technical field [0001] The invention belongs to the technical field of sound generating devices, and in particular relates to a structural design of a thermoacoustic device based on a thermoacoustic effect. Background technique [0002] The sounding device is generally composed of a sounding element and a signal input device. By adding an electric excitation signal to drive the sounding device, the sounding device emits a corresponding sound. In the prior art, the sound generating element is generally a loudspeaker, and the loudspeaker is an electro-acoustic device that converts electrical signals into sound signals. There are many types of existing loudspeakers, which can be classified into electromagnetic, electrostatic, electric and piezoelectric according to their working principles. Although these traditional speakers have different working principles, they generally generate their own mechanical vibrations, which affect the nearby air to generate fluctuations, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R23/00
Inventor 任天令田禾谢丹杨轶刘理天
Owner TSINGHUA UNIV
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