Thermo-acoustic device

Abstract

The invention relates to a thermo-acoustic device. The thermo-acoustic device comprises a substrate, a thermo-acoustic element, a first electrode and a second electrode, wherein the substrate is provided with a surface; the thermo-acoustic element is positioned on one side of the substrate and faces the surface of the substrate; the first electrode and the second electrode are arranged at an interval and are electrically connected with the thermo-acoustic element; a recess with an opening toward the thermo-acoustic element is formed in the surface of the substrate; the thermo-acoustic element is provided with a first area and a second area; the first area and the second area are positioned between the first electrode and the second electrode; the thermo-acoustic element in the first area covers the opening of the recess and is suspended; the thermo-acoustic element in the second area contacts the surface of the substrate; the recess comprises one or both of a blind groove structure and a blind hole structure. The thermo-acoustic device has the advantages of relatively high durability and good sounding effect.

Description

[0001] This case is a division of the Chinese invention patent application filed on January 15, 2009 with the application number 200910000260.8 and the name "Thermal Acoustic Device". technical field [0002] The invention relates to a thermoacoustic device. Background technique [0003] On October 29, 2008, Fan Shoushan et al. disclosed a thermoacoustic device using thermoacoustic effect, please refer to the document "Flexible, Stretchable, Transparent Carbon Nanotube Thin Film Loudspeakers", ShouShan Fan, et al., Nano Letters, Vol.8 (12), 4539-4545 (2008). The thermoacoustic element uses carbon nanotube film as a thermoacoustic element, because the carbon nanotube film has a large specific surface area and a very small heat capacity per unit area (less than 2×10 -4 Joules per square centimeter Kelvin), the thermoacoustic element can emit sound that can be heard by the human ear, and has a wide sound frequency range (100Hz~100kHz). In the thermoacoustic device, the carbon...

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Problems solved by technology

However, when the carbon nanotube film is suspended, the carbon nanotube film is easily damaged

When the carbon nanotube film is completely attached to the surface of the glass plate, most of the heat emitted by the carbon nanotube film is conducted away by the glass plate, and cannot be used to heat the surrounding air, so that the density of the surrounding air cannot be changed to produce sound.

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