CN101783994B - Thermoacoustic device - Google Patents

Thermoacoustic device Download PDF

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CN101783994B
CN101783994B CN 200910000259 CN200910000259A CN101783994B CN 101783994 B CN101783994 B CN 101783994B CN 200910000259 CN200910000259 CN 200910000259 CN 200910000259 A CN200910000259 A CN 200910000259A CN 101783994 B CN101783994 B CN 101783994B
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electrode
thermo
carbon nano
acoustic device
tube
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CN101783994A (en
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潜力
王昱权
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Beijing Funate Innovation Technology Co Ltd
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Beijing Funate Innovation Technology Co Ltd
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Priority to CN 200910000259 priority Critical patent/CN101783994B/en
Priority to US12/655,398 priority patent/US8325947B2/en
Priority to US12/661,106 priority patent/US8315414B2/en
Priority to US12/661,109 priority patent/US8300856B2/en
Priority to US12/661,108 priority patent/US8306246B2/en
Priority to US12/661,148 priority patent/US8315415B2/en
Priority to US12/661,132 priority patent/US8311244B2/en
Priority to US12/661,149 priority patent/US8345896B2/en
Priority to US12/661,925 priority patent/US8238586B2/en
Priority to US12/756,872 priority patent/US8325949B2/en
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Abstract

The invention aims to provide a thermoacoustic device, which can normally work and sound under a safe voltage and comprises a thermoacoustic element, a plurality of mutually and electrically connected first electrodes and a plurality of mutually and electrically connected second electrodes. The first electrodes and the second electrodes are mutually arranged at intervals and are electrically connected with the thermoacoustic element respectively, wherein the first electrodes and the second electrodes are mutually parallel and are alternately arranged; and the distances between neighbouring first and second electrodes are equal. The working voltage of the thermoacoustic device is less than 50v and meets the following conditions: n is the total number of the first and second electrodes; and R1 is the resistance of the thermoacoustic device in the direction from the first electrodes to the second electrodes.

Description

Thermo-acoustic device
Technical field
The present invention relates to a kind of sound-producing device, relate in particular to a kind of thermo-acoustic device.
Background technology
Sound-producing device generally is made up of signal input apparatus and sounding component.To sounding component, and then sounding component is sounded by the signal input apparatus input signal.The sounding principle of the sounding component that adopts in the sound-producing device of the prior art is the conversion of " electricity-Li-sound ", namely promotes ambient air by producing mechanical oscillation, sounds thereby make air dielectric produce fluctuation.This sounding component structure is comparatively complicated.For solving existing sounding component complex structure, problem that volume is bigger, people constantly research and develop novel sounding component.
As far back as earlier 1900s, namely the someone has proposed a kind of conception of the thermic sounding component based on thermic sounding principle, see also document " The thermophone as a precision source of sound ", H.D.Arnold, I.B.Crandall, Phys.Rev.10,22-38 (1917), it utilizes as thin as a wafer a platinized platinum as the thermic sounding component, and an AC audio signal of telecommunication is imported in this thermic sounding component.Because this platinized platinum has less unit are thermal capacitance, this platinized platinum can conduct its inner heat that produces rapidly gives surrounding medium.Therefore, under the effect of audio electrical signal, the heating and cooling rapidly of this platinized platinum, and and surrounding medium heat exchange takes place rapidly, the density of surrounding medium also changes thereupon, and then sends sound wave by the medium molecule motion, and namely the sounding principle of this thermic sounding component is the conversion of " electricity-Re-sound ".Yet, being subjected to the restriction of material, the sound that this thermic sounding component sends is very faint, be difficult to directly be heard by people's ear, and the audible frequency scope is narrower, and is far away apart from practical application.
Model was kept and was apt to wait the people to disclose another kind of thermic sounding component on October 29th, 2008, see also document " Flexible; Stretchable; Transparent Carbon Nanotube Thin FilmLoudspeakers ", Fan et al., Nano Letters, Vol.8 (12), 4539-4545 (2008).This thermic sounding component is a carbon nano-tube film, because this carbon nano-tube film has great specific area and minimum unit are thermal capacitance, this thermic sounding component can send the sound of the intensity that people's ear can hear, and have wideer audible frequency scope, be expected to replace the practical application of existing electrodynamic type thermic sounding component.
People such as Fan Shoushan are arranged at the surface of carbon nano-tube film with two electrodes, and finding that carbon nano-tube film between the electrode is imported can sounding behind the audio electrical signal that power amplifier amplifies.
But if consider practical application, this thermo-acoustic device should work under the safe voltage.Yet the document has only disclosed the sounding that can realize the thermic sounding component under the laboratory condition, does not relate to the safe voltage problem.How to guarantee the thermic sounding component under safe voltage normally sounding work be still the problem that the commercialization that realizes thermo-acoustic device will solve.
Summary of the invention
In view of this, necessaryly provide a kind of thermo-acoustic device, this thermo-acoustic device is operate as normal under operating voltage, and this operating voltage satisfies the safe voltage standard, is suitable for practical application.
A kind of thermo-acoustic device, it comprises a thermic sounding component, first electrode of a plurality of mutual electrical connections; And second electrode of a plurality of mutual electrical connections, these a plurality of first electrodes and a plurality of second electrode gap are arranged at this thermic sounding component surface and are electrically connected with this thermic sounding component respectively, these a plurality of first electrodes and a plurality of second electrode are parallel to each other and are arranged alternately, the first adjacent electrode equates with spacing between second electrode, the operating voltage of this thermo-acoustic device is less than 50 volts, and meets the following conditions:
Figure G2009100002595D00021
Figure G2009100002595D00022
Wherein, n represents the total quantity of this first electrode and second electrode, R 1Represent the resistance of this thermic sounding component on first electrode to the second electrode direction.
A kind of thermo-acoustic device, it comprises a thermic sounding component, first electrode of a plurality of mutual electrical connections, and second electrode of a plurality of mutual electrical connections, these a plurality of first electrodes and a plurality of second electrode gap are arranged at this thermic sounding component surface and are electrically connected with this thermic sounding component respectively, this thermic sounding component comprises one deck carbon nano-tube film at least, this carbon nano-tube film comprises a plurality of carbon nano-tube of extending along first electrode to the second electrode direction, wherein, these a plurality of first electrodes and a plurality of second electrode are parallel to each other and are arranged alternately, the first adjacent electrode equates with spacing between second electrode, and the operating voltage of this thermo-acoustic device is less than 50 volts and meet the following conditions:
Figure G2009100002595D00023
Wherein, n represents the total quantity of this first electrode and second electrode, and m represents the number of plies of carbon nano-tube film described in this thermic sounding component, and R represents the resistance of every layer of carbon nano-tube film on first electrode to the second electrode direction.
A kind of thermo-acoustic device comprises a carbon nano-tube membrane structure, and this carbon nano-tube membrane structure comprises the carbon nano-tube of a plurality of almost parallels, and this thermo-acoustic device further comprises: first electrode of a plurality of mutual electrical connections; And second electrode of a plurality of mutual electrical connections, these a plurality of first electrodes and a plurality of second electrode gap setting and be electrically connected with this carbon nano-tube membrane structure, these a plurality of first electrodes and a plurality of second electrode are parallel to each other and are arranged alternately, the first adjacent electrode equates with spacing between second electrode, described carbon nano-tube approximate vertical is connected between described first electrode and second electrode, the operating voltage of this thermo-acoustic device is less than 50 volts, and meets the following conditions:
Figure G2009100002595D00031
Wherein, n represents the total quantity of this first electrode and second electrode, R 1Represent the resistance of this carbon nano-tube membrane structure on first electrode to the second electrode direction.
A kind of thermo-acoustic device comprises a carbon nano-tube membrane structure that is formed by the multilayer carbon nanotube film-stack; This thermo-acoustic device further comprises: first electrode of a plurality of mutual electrical connections; And second electrode of a plurality of mutual electrical connections, these a plurality of first electrodes and a plurality of second electrode gap setting and be electrically connected with this thermic sounding component respectively, every layer of described carbon nano-tube film comprises the carbon nano-tube along the extension of first electrode to the second electrode direction of a plurality of almost parallels, wherein, these a plurality of first electrodes and a plurality of second electrode are parallel to each other and are arranged alternately, the first adjacent electrode equates with spacing between second electrode, the operating voltage of this thermo-acoustic device is less than 50 volts, and meets the following conditions:
Figure G2009100002595D00032
Figure G2009100002595D00033
Wherein, n represents the total quantity of this first electrode and second electrode, and m represents the number of plies of carbon nano-tube film described in this thermic sounding component, and R represents the resistance of every layer of carbon nano-tube film on first electrode to the second electrode direction.
Compared with prior art, thermo-acoustic device provided by the present invention by with electrode according to the certain rule setting be connected, thereby can control the resistance of thermo-acoustic device, make this thermo-acoustic device operate as normal under safe voltage, be conducive to the commercialization of thermo-acoustic device.
Description of drawings
Fig. 1 is a kind of schematic top plan view of thermo-acoustic device.
Fig. 2 is the front view of the thermo-acoustic device among Fig. 1.
Fig. 3 is the schematic perspective view of embodiment of the invention thermo-acoustic device.
Fig. 4 is the schematic perspective view that the embodiment of the invention comprises the thermo-acoustic device of multilayer carbon nanotube film.
Embodiment
Describe the specific embodiment of thermo-acoustic device of the present invention in detail below with reference to accompanying drawing.
See also Fig. 1 and Fig. 2, the embodiment of the invention provides a kind of thermo-acoustic device 100.This thermo-acoustic device 100 comprises a thermic sounding component 110, and a plurality of first electrodes 104 and a plurality of second electrode 108 alternately and at interval arrange and are electrically connected with this thermic sounding component 110 mutually.Wherein, in the present embodiment, the spacing between the first adjacent electrode 104 equates that the spacing between the second adjacent electrode 108 equates.Distance between two second electrodes 108 that each first electrode 104 is adjacent equates.Equally, two first distance between electrodes being adjacent of each second electrode 108 equate.This first electrode 104 and second electrode 108 are with whole thermic sounding component 110 conductings.For this thermo-acoustic device 100 is worked under the safe voltage, and normal sounding, described thermo-acoustic device 100 should satisfy following relational expression:
1 Ω ≤ R 1 ( n - 1 ) 2 ≤ 125 Ω - - - ( 1 )
Wherein, R 1Represent the resistance on first electrode, 104 to second electrodes, 108 directions of this thermic sounding component 110, n represents the total quantity of this first electrode 104 and second electrode 108.Satisfy the thermic sounding component 110 of above-mentioned scope can operate as normal in input power greater than 20 watts, operating voltage is less than under 50 volts the condition.
Described thermic sounding component 110 is specially a resistance element by the work of thermic sounding principle, have less unit are thermal capacitance (as, less than 2 * 10 -4Every square centimeter of Kelvin of joule), and has than bigger serface and less thickness, thereby make this thermic sounding component 110 electric energy of input can be converted to heat energy, and carry out heat exchange fully fast with surrounding medium.
Described thermic sounding component 110 can comprise a carbon nano tube structure.In the present embodiment, this structure is a carbon nano-tube membrane structure, and it can be single-layer carbon nano-tube film 112, also can be to be laminated by multilayer carbon nanotube film 112.But should be noted that, thermic sounding component of the present invention also not only is confined to for example carbon nano tube structure of carbon nano-tube film, other use the present invention's design, can be based on the sounding component of thermic sounding principle, all within the scope that claim of the present invention contains.
Every layer of carbon nano-tube film 112 comprises a plurality of carbon nano-tube that roughly are parallel to each other.The bearing of trend of this carbon nano-tube is roughly parallel to the surface of this carbon nano-tube film 112.This first electrode 104 and second electrode 108 are the elongated shape of one dimension.Above-mentioned carbon nano-tube is connected between this first electrode 104 and second electrode 108.This carbon nano-tube film 112 has thickness and resistance comparatively uniformly comparatively uniformly.When the number of plies of carbon nano-tube film 112 in the thermic sounding component 110 was represented with m, described thermo-acoustic device 100 satisfied following relational expression:
1 Ω ≤ R m ( n - 1 ) 2 ≤ 125 Ω - - - ( 2 )
Wherein, R represents the resistance of single-layer carbon nano-tube film 112 on first electrode, 104 to second electrodes, 108 directions, and n represents the total quantity of described first electrode 104 and second electrode 108.In other embodiments, when this carbon nano tube structure is when being laminated by multilayer carbon nanotube film 112, this carbon nano tube structure can comprise at least that one deck rises to be supported used carbon nano-tube film and is clipped between other adjacent carbon nano-tube films 112.This plays the used carbon nano-tube film of support and can be made of the carbon nano-tube of a plurality of almost parallels.If its bearing of trend is vertical with the above-mentioned carbon nano-tube that is connected between first electrode 104 and second electrode 108, then rise and support used carbon nano-tube film because not being electrically connected between first electrode 104 and second electrode 108, so disregard the number of plies at above-mentioned carbon nano-tube film 112, namely within the m.But this embodiment is also within the protection range of claim of the present invention.For example: if when this carbon nano tube structure be to be laminated by four layers of carbon nano-tube film, the carbon nano-tube in ground floor and the 3rd layer is parallel to each other and is connected between first and second electrode; Carbon nano-tube in the second layer and the 4th layer is parallel to each other, and perpendicular with the carbon nano-tube in ground floor and the 3rd layer, and then the number of stories m of the carbon nano-tube film 112 of this carbon nano tube structure should equal 2.
This carbon nano tube structure has two facing surfaces.These a plurality of first electrodes 104 are parallel to each other with a plurality of second electrodes 108 and the described surface that is arranged at described carbon nano tube structure at mutual equally spaced interval, and are electrically connected with described carbon nano tube structure respectively.Be appreciated that described first electrode 104 and second electrode 108 can be arranged at similar face or the different surfaces of this carbon nano tube structure.In the present embodiment, the length of this first electrode 104 and second electrode 108 enough makes this first electrode 104 and second electrode 108 cross over whole carbon nano tube structure surface, and, outermost two electrodes are positioned at the two ends of this carbon nano tube structure in this first electrode 104 and second electrode 108, thereby guarantee that this first electrode 104 and second electrode 108 are with whole carbon nano tube structure conducting.This first electrode 104 and second electrode 108 can be strip or shaft-like.The material of this first electrode 104 and second electrode 108 is metal, conducting resinl, electrocondution slurry, conducting polymer or the indium tin oxide (ITO) etc. with high conductance.Present embodiment is preferably the electrocondution slurry of argentiferous particle.This first electrode 104 and second electrode 108 are used for receiving the audio electrical signal of an outside power amplification of importing, and conduct to whole carbon nano tube structure.
See also Fig. 3 and Fig. 4, these a plurality of first electrodes 104 and these a plurality of second electrodes 108 replace mutually is arranged at this carbon nano tube structure surface.What is called is arranged alternately namely except outermost two electrodes, between described two first electrodes 104 second electrode 108 is set, and between described two second electrodes 108 first electrode 104 is set.Have equal current potential thereby be electrically connected between described a plurality of first electrode 104, have equal current potential thereby be electrically connected between described a plurality of second electrode 108.Be electrically connected by described carbon nano tube structure between the first adjacent electrode 104 and second electrode 108, described carbon nano tube structure receives the audio electrical signal of a power amplification by this first electrode 104 and second electrode 108.In the present embodiment, be electrically connected by first conductive part 114 perpendicular to this first electrode 104 between these a plurality of first electrodes 104, be electrically connected by second conductive part 118 perpendicular to this second electrode 108 between these a plurality of second electrodes 108, this first conductive part 114 is oppositely arranged with this second conductive part 118.This first conductive part 114 and second conductive part 118 can be lead or conducting strip.When this first conductive part 114 and second conductive part 118 were conducting strip, this conducting strip can have a plurality of location divisions, as location hole.These a plurality of first electrodes 104 and a plurality of second electrode 108 can be positioned on this conducting strip by this location division respectively, thereby make this first electrode 104 and second electrode 108 be easier to accurate localization on this carbon nano tube structure surface, and be easier to guarantee that these a plurality of first electrodes 104 equate with distance between a plurality of second electrodes 108, make this thermo-acoustic device 100 have better sounding effect.
Described first electrode 104 and second electrode 108 are electrically connected with a power amplifier (not shown) respectively, two electrodes of this power amplifier link to each other with this first electrode 104 and second electrode 108 respectively, and import the audio electrical signal of a power amplification to described thermic sounding component 110 by this first electrode 104 and second electrode 108.Particularly, this power amplifier is to the voltage of an additional alternation between the first adjacent arbitrarily electrode 104 and second electrode 108.In the present embodiment, this first conductive part 114 is electrically connected with described power amplifier respectively with second conductive part 118.
Below the derivation of above-mentioned relation formula (1) and relational expression (2) is proved.
Seeing also Fig. 1 and Fig. 2, because this thermic sounding component 110 is a resistance element, and is a membrane structure, and the length that therefore can establish this thermic sounding component 110 is l, and width is d, and thickness is h.Because this thermic sounding component 110 has thickness comparatively uniformly, so h is a constant.When one first electrode 104 and one second electrode 108 are arranged at this thermic sounding component 110 two ends, and when making whole thermic sounding component 110 conductings, the resistance R of this thermic sounding component 110 on these first electrode, 104 to second electrodes, 108 directions 1The relational expression that satisfies is:
R 1 = k l S = k l dh - - - ( 3 )
Wherein, k is the resistivity of this thermic sounding component 110, and S is the sectional area of this thermic sounding component 110 on first electrode, 104 to second electrodes, 108 directions for the current lead-through direction.Because the value of k depends on properties of materials, and this thermic sounding component 110 has uniform conductivity, so k is a constant.
When the contact resistance of the resistance of ignoring first electrode 104 and second electrode 108 and electrode and thermic sounding component 110, the resistance of this thermo-acoustic device 100 equals the resistance of this thermic sounding component 110, that is: R 2=R 1, R wherein 2The resistance of representing this thermo-acoustic device 100.
When this thermic sounding component 110 is a square carbon nano-tube film, l=d, then R 1Be a constant and the square resistance that equals this carbon nano-tube film R 1 = Rs = k h , Wherein, Rs represents the square resistance of this carbon nano-tube film.
This carbon nano-tube film of the present invention can be pulled out acquisition from carbon nano pipe array.This carbon nano-tube film is made up of the carbon nano-tube that joins end to end and be arranged of preferred orient by Van der Waals force, the surperficial almost parallel of the bearing of trend of carbon nano-tube and carbon nano-tube film.Record as can be known through experiment, in the present embodiment, the scope of the square resistance Rs of this carbon nano-tube film is 800 Europe≤Rs≤1000 Europe.Be appreciated that, because in this carbon nano-tube film, carbon nano-tube is arranged of preferred orient in the same direction, therefore, this first electrode 104 and second electrode 108 should be arranged at this carbon nano-tube film along the two ends in the carbon nano-tube orientation, namely the carbon nano-tube in this carbon nano-tube film is extended along first electrode, 104 to second electrodes, 108 directions, thereby makes this thermic sounding component 110 conductings.
See also Fig. 3, when this thermo-acoustic device 100 comprises a plurality of first electrodes 104, a plurality of second electrode 108, when reaching a thermic sounding component 110, if these a plurality of first electrodes 104 and a plurality of second electrodes 108 add up to n, this thermic sounding component 110 is divided into equal n-1 section, the length of every section thermic sounding component 110 by this first electrode 104 and second electrode 108 l 0 = l n - 1 , In the current lead-through direction, i.e. this first electrode, 104 to second electrodes, 108 directions, the sectional area S of every section thermic sounding component 110 0=S=dh, the then resistance R of every section thermic sounding component 110 of these first electrode, 104 to second electrodes, 108 directions 0The relational expression that satisfies is:
R 0 = k l 0 S 0 = k l 0 dh = k l ( n - 1 ) dh - - - ( 4 )
Be electrically connected by first conductive part 114 between these a plurality of first electrodes 104, be electrically connected by second conductive part 118 between these a plurality of second electrodes 108.So this n-1 section thermic sounding component 110 is parallel with one another.Therefore, the resistance R of this thermo-acoustic device 100 2The relational expression that satisfies is:
R 2 = R 0 n - 1 = k l 0 ( n - 1 ) dh = k l ( n - 1 ) 2 dh - - - ( 5 )
With formula (3) substitution formula (5), so have again: R 2 = 1 ( n - 1 ) 2 R 1 - - - ( 6 )
The resistance R of the input power P of this thermo-acoustic device 100 and operating voltage U and thermo-acoustic device 100 2Satisfy equation:
P = U 2 R 2 - - - ( 7 )
Through experiment as can be known, when the input power of this thermo-acoustic device 100 more than or equal to 20 watts (during P 〉=20W), this thermo-acoustic device 100 can operate as normal, and sends the sound that people's ear can be heard intensity, therefore has:
P = U 2 R 2 ≥ 20 W - - - ( 8 )
In addition, this sound-producing device 100 should work under the safe voltage, and namely operating voltage should satisfy:
U≤50V (9)
With formula (7) substitution formula (8) and formula (9) as can be known in this thermo-acoustic device 100, the resistance R of this thermic sounding component 110 1N should satisfy relational expression with the electrode total quantity:
R 2 = R 1 ( n - 1 ) 2 ≤ 125 Ω - - - ( 10 )
In addition, because this thermo-acoustic device 100 in use, need to link to each other with the power amplifier of outside, consider that this power amplifier has an internal resistance, when the resistance R of thermo-acoustic device 100 2When too small, the power consumption of this power amplifier is bigger, so R 2Should be greater than 1 Europe, that is:
1 Ω ≤ R 1 ( n - 1 ) 2 ≤ 125 Ω - - - ( 1 )
The relational expression that number of electrodes should satisfy when formula (1) was these thermo-acoustic device 100 application is by simple mensuration R 1, can determine the scope of n.In addition, with formula (6) substitution formula (7), can obtain the computing formula of concrete number of electrodes n:
n = PR 1 U 2 + 1 - - - ( 11 )
According to formula (11), under the condition of setting rated power P and operating voltage U, the quantity n of electrode is only determined by the internal resistance of thermic sounding component R1, therefore the resistance of thermo-acoustic device 100 be can adjust according to formula (11) by the simple quantity n that changes electrode, required condition of work P and U satisfied.
See also Fig. 4, when this thermic sounding component 110 comprises that the equal-sized carbon nano-tube film of m layer overlaps, have R 1 = R m , Wherein R is the resistance of every layer of carbon nano-tube film on first electrode, 104 to second electrodes, 108 directions, then namely has according to formula (6) and (1):
R 2 = 1 m ( n - 1 ) 2 R - - - ( 12 )
1 Ω ≤ R m ( n - 1 ) 2 ≤ 125 Ω - - - ( 2 )
As previously mentioned, the m in formula (12) and the formula (2) only is that carbon nano-tube is along the quantity of the carbon nano-tube film of first electrode, 104 to second electrodes, 108 extensions.
When this carbon nano-tube film is square, R=Rs, then the R in formula (12) and the formula (2) is the square resistance of this carbon nano-tube film.Record through test, the square resistance Rs that pulls the carbon nano-tube film of acquisition from carbon nano pipe array is about 800 Europe～1000 Europe.When the square resistance of this carbon nano-tube film was 1000 Europe, through type (2) m and n as can be known should satisfy 8≤m (n-1) 2≤ 1000, when the number of stories m of carbon nano-tube film is 1,8≤(n-1) 2≤ 1000, i.e. 4≤n≤32.When the number of stories m of carbon nano-tube film is 2,3≤n≤23.
The input power of this thermo-acoustic device 100 is relevant with the area of this thermic sounding component 110, and when this thermic sounding component 110 during for one deck carbon nano-tube film at least, the power density that drives these thermo-acoustic device 100 sounding is about 1 watt/square centimeter.Preferably, the input power P of this thermo-acoustic device 100 should be less than 500 watts, i.e. 20W≤P≤500W.According to formula (11), when operating voltage is respectively 42 volts, 36 volts, 24 volts or 12 volts, and during m=1, this electrode number n should satisfy the scope of table 1:
Table 1
Operating voltage (volt) 42 36 24
Number of electrodes 5≤n≤17 5≤n≤20 7≤n≤30
When m=2, have n = PR 1 2 U 2 + 1 , Electrode number n should satisfy the scope of table 2:
Table 2
Operating voltage (volt) 42 36 24
Number of electrodes 4≤n≤12 4≤n≤14 6≤n≤21
Preferably, this thermic sounding component 110 is the single-layer carbon nano-tube film, and the resistance of this thermo-acoustic device 100 is 4 Europe～12 Europe, and the operating voltage of this thermo-acoustic device 100 is 12 volts, 24 volts or 36 volts.In the present embodiment, this thermic sounding component 110 is a foursquare carbon nano-tube film, and the input power of this thermo-acoustic device 100 is preferably 100W, and operating voltage is 36V, and then the quantity of this electrode is 10.
The sound pressure level of the thermo-acoustic device 100 that present embodiment provides is greater than 50 decibels of every watt of sound pressure levels, and it (is 1Hz～100kHz) that the audible frequency scope is 1 hertz to 100,000 hertz.The distortion factor of described thermo-acoustic device in 500 hertz～40,000 hertz frequency scopes can be less than 3%.By described first electrode 104 and second electrode 108 are arranged alternately, and the method that connects respectively, can make per two first adjacent electrodes 104 and the thermic sounding component parallel connection between second electrode 108, thereby by the simple satisfied relation of number of stories m of adjusting total quantity n and the carbon nano-tube film of described electrode 1 &Omega; < R m ( n - 1 ) 2 < 125 &Omega; , Make this thermo-acoustic device (20 watts～500 watts) under the certain situation of power, operating voltage satisfies the regulation of safe voltage standard, is conducive to the commercialization of thermo-acoustic device 100.
In addition, those skilled in the art also can do other variations in spirit of the present invention, and certainly, the variation that these are done according to spirit of the present invention all should be included within the present invention's scope required for protection.

Claims (20)

1. thermo-acoustic device, it comprises a thermic sounding component; It is characterized in that this thermo-acoustic device further comprises:
First electrode of a plurality of mutual electrical connections; And
Second electrode of a plurality of mutual electrical connections, these a plurality of first electrodes and a plurality of second electrode gap are arranged at this thermic sounding component surface and are electrically connected with this thermic sounding component respectively,
These a plurality of first electrodes and a plurality of second electrode are parallel to each other and are arranged alternately, and the first adjacent electrode equates with spacing between second electrode, and the operating voltage of this thermo-acoustic device is less than 50 volts, and meet the following conditions:
Figure FDA00002751846000011
Wherein, n represents the total quantity of this first electrode and second electrode, R 1Represent the resistance of this thermic sounding component on first electrode to the second electrode direction.
2. thermo-acoustic device as claimed in claim 1 is characterized in that, this thermo-acoustic device comprises a carbon nano-tube film or a plurality of stacked carbon nano-tube film.
3. thermo-acoustic device as claimed in claim 1 is characterized in that, described a plurality of first electrodes are electrically connected by one first conductive part, and described a plurality of second electrodes are electrically connected by one second conductive part.
4. thermo-acoustic device as claimed in claim 1 is characterized in that, the power bracket of this thermo-acoustic device is 20 watts ~ 500 watts.
5. thermo-acoustic device, it comprises a thermic sounding component, this thermic sounding component comprises one deck carbon nano-tube film at least; It is characterized in that this thermo-acoustic device further comprises:
First electrode of a plurality of mutual electrical connections; And
Second electrode of a plurality of mutual electrical connections, these a plurality of first electrodes and a plurality of second electrode gap are arranged at this thermic sounding component surface and are electrically connected with this thermic sounding component respectively, this carbon nano-tube film comprises a plurality of carbon nano-tube of extending along first electrode to the second electrode direction
These a plurality of first electrodes and a plurality of second electrode are parallel to each other and are arranged alternately, and the first adjacent electrode equates with spacing between second electrode, and the operating voltage of this thermo-acoustic device is less than 50 volts and meet the following conditions:
Figure FDA00002751846000021
Wherein, n represents the total quantity of this first electrode and second electrode, and m represents the number of plies of carbon nano-tube film described in this thermic sounding component, and R represents the resistance of every layer of carbon nano-tube film on first electrode to the second electrode direction.
6. thermo-acoustic device as claimed in claim 5 is characterized in that, this at least one deck carbon nano-tube film comprise a plurality of stacked settings and equal and opposite in direction, the carbon nano-tube film that shape is identical.
7. thermo-acoustic device as claimed in claim 5 is characterized in that, the power bracket of this thermo-acoustic device is 20 watts ~ 500 watts.
8. thermo-acoustic device as claimed in claim 5 is characterized in that, the square resistance of described carbon nano-tube film is 800 Europe ~ 1000 Europe.
9. thermo-acoustic device as claimed in claim 5, it is characterized in that, the described carbon nano-tube film of one deck at least is the foursquare carbon nano-tube film of individual layer, and the square resistance of described carbon nano-tube film is about 1000 Europe, and described first electrode and the second electrode total quantity n satisfy 4≤n≤32.
10. thermo-acoustic device as claimed in claim 9 is characterized in that, the operating voltage of described thermo-acoustic device is 42 volts, and the total quantity n of described first electrode and second electrode satisfies 5≤n≤17.
11. thermo-acoustic device as claimed in claim 9 is characterized in that, the operating voltage of described thermo-acoustic device is 36 volts, and the total quantity n of described first electrode and second electrode satisfies 5≤n≤20.
12. thermo-acoustic device as claimed in claim 9 is characterized in that, the operating voltage of described thermo-acoustic device is 24 volts, and the total quantity n of described first electrode and second electrode satisfies 7≤n≤30.
13. thermo-acoustic device as claimed in claim 5, it is characterized in that, the described carbon nano-tube film of one deck at least comprises the foursquare carbon nano-tube film that two superimposed arranges, and the square resistance of described carbon nano-tube film is about 1000 Europe, and described first electrode and the second electrode total quantity n satisfy 3≤n≤32.
14. thermo-acoustic device as claimed in claim 13 is characterized in that, the operating voltage of described thermo-acoustic device is 42 volts, and the total quantity n of described first electrode and second electrode satisfies 4≤n≤12.
15. thermo-acoustic device as claimed in claim 13 is characterized in that, the operating voltage of described thermo-acoustic device is 36 volts, and the total quantity n of described first electrode and second electrode satisfies 4≤n≤14.
16. thermo-acoustic device as claimed in claim 13 is characterized in that, the operating voltage of described thermo-acoustic device is 24 volts, and the total quantity n of described first electrode and second electrode satisfies 6≤n≤21.
17. a thermo-acoustic device comprises a carbon nano-tube membrane structure, and this carbon nano-tube membrane structure comprises the carbon nano-tube of a plurality of almost parallels, it is characterized in that this thermo-acoustic device further comprises:
First electrode of a plurality of mutual electrical connections; And
Second electrode of a plurality of mutual electrical connections, these a plurality of first electrodes and a plurality of second electrode gap setting and be electrically connected with this carbon nano-tube membrane structure,
These a plurality of first electrodes and a plurality of second electrode are parallel to each other and are arranged alternately, the first adjacent electrode equates with spacing between second electrode, described carbon nano-tube approximate vertical is connected between described first electrode and second electrode, the operating voltage of this thermo-acoustic device is less than 50 volts, and meets the following conditions:
Figure FDA00002751846000031
Wherein, n represents the total quantity of this first electrode and second electrode, R 1Represent the resistance of this carbon nano-tube membrane structure on first electrode to the second electrode direction.
18. thermo-acoustic device as claimed in claim 17 is characterized in that, the surperficial almost parallel of the bearing of trend of described carbon nano-tube and carbon nano-tube membrane structure.
19. a thermo-acoustic device comprises a carbon nano-tube membrane structure that is formed by the multilayer carbon nanotube film-stack; It is characterized in that this thermo-acoustic device further comprises:
First electrode of a plurality of mutual electrical connections; And
Second electrode of a plurality of mutual electrical connections, these a plurality of first electrodes and a plurality of second electrode gap setting and be electrically connected with this carbon nano-tube membrane structure respectively, every layer of described carbon nano-tube film comprises the carbon nano-tube along the extension of first electrode to the second electrode direction of a plurality of almost parallels
These a plurality of first electrodes and a plurality of second electrode are parallel to each other and are arranged alternately, and the first adjacent electrode equates with spacing between second electrode, and the operating voltage of this thermo-acoustic device is less than 50 volts, and meet the following conditions:
Figure FDA00002751846000032
Wherein, n represents the total quantity of this first electrode and second electrode, and m represents the number of plies of carbon nano-tube film described in this carbon nano-tube membrane structure, and R represents the resistance of every layer of carbon nano-tube film on first electrode to the second electrode direction.
20. thermo-acoustic device as claimed in claim 19 is characterized in that, the surperficial almost parallel of the bearing of trend of described carbon nano-tube and carbon nano-tube membrane structure.
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US12/661,109 US8300856B2 (en) 2008-12-30 2010-03-11 Thermoacoustic device
US12/661,108 US8306246B2 (en) 2008-12-30 2010-03-11 Thermoacoustic device
US12/661,148 US8315415B2 (en) 2008-12-30 2010-03-11 Speaker
US12/661,132 US8311244B2 (en) 2008-12-30 2010-03-11 Thermoacoustic device
US12/661,106 US8315414B2 (en) 2008-12-30 2010-03-11 Thermoacoustic device
US12/661,149 US8345896B2 (en) 2008-12-30 2010-03-11 Thermoacoustic device
US12/661,925 US8238586B2 (en) 2008-12-30 2010-03-25 Thermoacoustic device
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US10327060B2 (en) * 2017-11-05 2019-06-18 xMEMS Labs, Inc. Air pulse generating element and sound producing device
US10771891B2 (en) 2018-08-19 2020-09-08 xMEMS Labs, Inc. Method for manufacturing air pulse generating element
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CN2694395Y (en) * 2004-04-09 2005-04-20 绵阳市东升电子科技有限责任公司 Safe low pressure emergency lighting electronic equipment with fire/theft alarm monitoring function
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US4385634A (en) * 1981-04-24 1983-05-31 University Of Arizona Foundation Radiation-induced thermoacoustic imaging
CN2694395Y (en) * 2004-04-09 2005-04-20 绵阳市东升电子科技有限责任公司 Safe low pressure emergency lighting electronic equipment with fire/theft alarm monitoring function
CN2927442Y (en) * 2006-06-01 2007-07-25 贾翱东 Locker against electric shock for household electrical appliance

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