Encapsulated thermoacoustic projector based on freestanding carbon nanotube film

    公开(公告)号:US09635468B2

    公开(公告)日:2017-04-25

    申请号:US14776257

    申请日:2014-03-14

    IPC分类号: H04R25/00 H04R23/00 B82Y30/00

    摘要: A suspended nanotube film (or films) producing sound by means of the thermoacoustic (TA) effect is encapsulated between two plates, at least one of which vibrates, to enhance sound generation efficiency and protect the film. To avoid the oxidation of carbon nanotubes at elevated temperatures and reduce the thermal inertia of surrounding medium the enclosure is filled with inert gas (preferably with high heat capacity ratio, γ=Cp/Cv, and low heat capacity, Cp). To generate sound directly as the first harmonic of applied audio signal without use of an energy consuming dc biasing, an audio signal modulated carrier frequency at much higher frequency is used to provide power input. Various other inventive means are described to provide enhanced projected sound intensity, increased projector efficiency, and lengthened projector life, like the use of infrared reflecting coatings and particles on the projector plates, non-parallel sheet alignment in sheet stacks, and cooling means on one projector side.

    ENCAPSULATED THERMOACOUSTIC PROJECTOR BASED ON FREESTANDING CARBON NANOTUBE FILM
    4.
    发明申请
    ENCAPSULATED THERMOACOUSTIC PROJECTOR BASED ON FREESTANDING CARBON NANOTUBE FILM 有权
    基于自动碳纳米管膜的封装热电影投影仪

    公开(公告)号:US20160037267A1

    公开(公告)日:2016-02-04

    申请号:US14776257

    申请日:2014-03-14

    IPC分类号: H04R23/00

    摘要: A suspended nanotube film (or films) producing sound by means of the thermoacoustic (TA) effect is encapsulated between two plates, at least one of which vibrates, to enhance sound generation efficiency and protect the film. To avoid the oxidation of carbon nanotubes at elevated temperatures and reduce the thermal inertia of surrounding medium the enclosure is filled with inert gas (preferably with high heat capacity ratio, γ=Cp/Cv, and low heat capacity, Cp). To generate sound directly as the first harmonic of applied audio signal without use of an energy consuming dc biasing, an audio signal modulated carrier frequency at much higher frequency is used to provide power input. Various other inventive means are described to provide enhanced projected sound intensity, increased projector efficiency, and lengthened projector life, like the use of infrared reflecting coatings and particles on the projector plates, non-parallel sheet alignment in sheet stacks, and cooling means on one projector side.

    摘要翻译: 通过热声(TA)效应产生声音的悬浮的纳米管膜(或膜)封装在两个板之间,其中至少一个振动,以增强发声效率并保护膜。 为了避免碳纳米管在升高的温度下氧化并降低周围介质的热惯性,外壳充满惰性气体(优选具有高热容量比,γ= Cp / Cv,低热容量Cp)。 为了直接产生声音作为应用音频信号的一次谐波而不使用能量消耗直流偏置,使用高得多的频率的音频信号调制载波频率来提供功率输入。 描述了各种其它创造性的方式来提供增强的投影声音强度,增加的投影机效率和延长的投影机寿命,例如在投影仪板上使用红外反射涂层和颗粒,在片材堆叠中使用不平行的片材对准,以及在一个 投影机侧