CN101820571B - Speaker system - Google Patents
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- CN101820571B CN101820571B CN2009101058085A CN200910105808A CN101820571B CN 101820571 B CN101820571 B CN 101820571B CN 2009101058085 A CN2009101058085 A CN 2009101058085A CN 200910105808 A CN200910105808 A CN 200910105808A CN 101820571 B CN101820571 B CN 101820571B
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Abstract
The invention relates to a speaker system which comprises a speaker and a power amplifier, wherein the power amplifier changes received audio electrical signals to amplified voltage signals by power amplification and drives the speaker to generate sound; the speaker comprises a thermal sound-generating element and at least two electrodes which are arranged at intervals and are electrically connected with the thermal sound-generating element, and the at least two electrodes input the amplified voltage signals to the thermal sound-generating element. The speaker system is applicable to the electroacoustic transformation field, has simple structure, can operate in a nonmagnetic environment, and has wider sound-generating frequency range and higher sound-generating intensity.
Description
Technical field
The present invention relates to a kind of speaker system, relate in particular to a kind of speaker system based on the thermic sounding.
Background technology
Speaker system of the prior art comprises a loud speaker and a power amplifier, and this power amplifier is used for receiving an audio electrical signal, and by this audio electrical signal power amplification, thereby drive this loud speaker sounding.The kind of existing loud speaker is a lot, according to its operation principle, is divided into: dynamic speaker, electrostatic loudspeaker and piezo-electric loudspeaker.Although their working method difference, generally be by producing mechanical oscillation and promote ambient air, thereby make air dielectric produce the conversion that fluctuation realizes " electricity-Li-sound ".Wherein, dynamic speaker is most widely used.
In existing dynamic speaker, a voice coil loudspeaker voice coil is placed in the magnetic field of a variation, and produces vibration with changes of magnetic field, and the vibrations of voice coil loudspeaker voice coil drive the vibrating diaphragm be attached thereto and vibrate and sound.Yet this dynamic speaker must be worked having under the condition of magnetic, further, no matter dynamic speaker, electrostatic loudspeaker or piezo-electric loudspeaker in prior art, its structure is all comparatively complicated, is difficult to lightening and miniaturization.
Since the early 1990s, (refer to Helical microtubules of graphitic carbon with carbon nano-tube, Nature, Sumio Iijima, vol 354, p56 (1991)) caused that people pay close attention to greatly for nano material structure and the character unique with it of representative.Yet single-root carbon nano-tube is nanoscale, a large amount of carbon nano-tube are easily reunited, and are difficult for disperseing to form uniform carbon nano-tube film, thereby have limited the application of carbon nano-tube in macroscopical field.Disclosed a kind of Nanotubes in the Chinese patent that the patent No. that the people such as Jiang Kaili applied for and announce on August 20th, 2008 on September 16th, 2002 is 02134760.3, this Nanotubes comprises by the end to end carbon nano-tube bundle fragment of Van der Waals force, and the carbon nano-tube in this Nanotubes is arranged substantially in the same direction.This Nanotubes can be used for macroscopical field by carbon nano-tube easily.
In recent years, along with deepening continuously of carbon nano-tube and nano materials research, its wide application prospect constantly displayed.For example, the performances such as the electromagnetism of the uniqueness had due to carbon nano-tube, optics, mechanics, chemistry, a large amount of relevant its application studies in fields such as field emitting electronic source, transducer, novel optical material, soft ferromagnetic materials constantly are in the news.Yet, but not yet find in prior art that carbon nano-tube is used for field of acoustics.
Summary of the invention
In view of this, necessaryly provide a kind of speaker system, this speaker system is simple in structure, can under the condition without magnetic, work, and have wider audible frequency scope and higher intensity of phonation.
A kind of speaker system, it comprises: a loud speaker; And a power amplifier, this power amplifier is amplification voltage signal by the audio electrical signal power amplification of reception, and drives this loud speaker sounding; Wherein: this loud speaker comprises a thermic sounding component and at least two electrode gap settings and is electrically connected to this thermic sounding component, and these at least two electrodes input to amplification voltage signal in this thermic sounding component.This speaker system is applied to electroacoustic conversion field, simple in structure, can under the condition without magnetic, work, and have wider audible frequency scope and higher intensity of phonation.
Compared with prior art, described speaker system has the following advantages: one, described speaker system is using the thermic sounding component as a transducing head, by electric energy, by thermal power transfer, be acoustic energy, without other labyrinths such as magnet, therefore the structure of this speaker system is comparatively simple, is conducive to reduce the cost of this speaker system, and can be applicable to than wide-range.Its two, the audio electrical signal of the outside input of this speaker system utilization causes this thermic sounding component variations in temperature, thereby makes its surrounding medium expand rapidly and shrink, and then sends sound wave, without vibrating diaphragm, therefore this speaker system can be worked under the condition without magnetic.
The accompanying drawing explanation
Fig. 1 is the annexation schematic diagram of embodiment of the present invention speaker system.
Fig. 2 is the operating circuit schematic diagram of embodiment of the present invention speaker system.
Fig. 3 is the voltage bias mode schematic diagram of embodiment of the present invention speaker system.
Fig. 4 is the structural representation of the carbon nano-tube fragment of carbon nano tube structure in embodiment of the present invention speaker system.
Fig. 5 is the stereoscan photograph of carbon nano-tube film in embodiment of the present invention speaker system.
Fig. 6 is the stereoscan photograph of carbon nano tube line in embodiment of the present invention speaker system.
Fig. 7 is the stereoscan photograph of carbon nano-tube stranded wire in embodiment of the present invention speaker system.
Fig. 8 is the frequency response characteristic of loud speaker in embodiment of the present invention speaker system.
Embodiment
Describe embodiment of the present invention speaker system in detail below with reference to accompanying drawing.
Refer to Fig. 1, the embodiment of the present invention provides a kind of speaker system 10, and this speaker system 10 comprises a loud speaker 12, a power amplifier 14 and an audio signal source 20.This power amplifier 14 is electrically connected to this loud speaker 12.This audio signal source 20 is electrically connected to this power amplifier 14.
This audio signal source 20 provides an audio electrical signal.In the present embodiment, this audio electrical signal is an analog signal.The change frequency of this audio electrical signal changes according to the variation of sound frequency.This audio signal source 20 can be broadcast receiver, recorder, player or computer etc.
This power amplifier 14 is electrically connected to this audio signal source 20.Particularly, this audio signal source 20 has an audio electrical signal output.This power amplifier 14 is electrically connected to this audio electrical signal output.This power amplifier 14 is the audio electrical signal power amplification, and exports an amplification voltage signal.Particularly, this power amplifier 14 has two outputs 114 and an input 112, this input 112 is electrically connected to an audio signal source 20, and this output 114 is electrically connected to described loud speaker 12, and transmits amplification voltage signals according to the audio electrical signal of input 112 inputs to loud speaker 12.
For making this loud speaker 12 can send the sound of normal frequency, this power amplifier 14 can be exported an amplification voltage signal with bias voltage.Refer to Fig. 2, in the present embodiment, described power amplifier 14 is the category-A power amplifier, and it comprises at least one the first resistance R 1, one second resistance R 2, one the 3rd resistance R 3, one electric capacity and a triode.This triode has a base stage B, an emitter E and a collector electrode C.One end of this electric capacity is electrically connected to the output of audio signal source 20, and the other end is electrically connected to the base stage B of this triode.One direct current voltage source Vcc and the base stage B that is connected to this triode after the first resistance R 1 is connected.Ground connection after the base stage B of this triode connects with the second resistance R 2.This emitter E is connected to an output 114 of this power amplifier 14, and this direct voltage source Vcc is connected to another output 114 of this power amplifier.Ground connection after this collector electrode C connects with the 3rd resistance R 3.
Be appreciated that; this power amplifier 14 is not limited to above-mentioned category-A power amplifier; as long as the amplification voltage signal that can setover to described thermic sounding component 12 conduction one according to audio signal source 20; make the voltage of this amplification voltage signal be on the occasion of or be the power amplifier 14 of negative value; as D class power amplifier, all in protection range of the present invention.Refer to Fig. 3, the voltage signal after this biasing is positive voltage.
This loud speaker 12 comprises a thermic sounding component 122 and at least two electrodes 124.These at least two electrodes 124 are spaced and be electrically connected to this thermic sounding component 122.Two outputs 114 of described power amplifier 14 are connected to respectively two electrodes 124 of this thermic sounding component 122.In the present embodiment, the emitter E of this power amplifier 14 directly is electrically connected to an electrode 124 of this loud speaker 12, this direct voltage source Vcc directly is electrically connected to another electrode 124 of loud speaker 12, thereby is connected to the emitter E of this power amplifier 14 after making this direct voltage source Vcc and this loud speaker 12 being connected.
Be appreciated that, when this loud speaker 12 comprises a plurality of electrode 124, two electrodes 124 of arbitrary neighborhood are electrically connected to two outputs 114 of described power amplifier 14 respectively, make this power amplifier 14 input an amplification voltage signal in the thermic sounding component 122 between these two adjacent electrodes 124, thereby make the sounding component 122 between two adjacent electrodes 124 pass through these two electrode 124 parallel connections.
In the present embodiment, described thermic sounding component 122 is a carbon nano tube structure.Described carbon nano tube structure comprises a plurality of carbon nano-tube, and the plurality of carbon nano-tube is in contact with one another, thereby forms a uniform conductive network.Preferably, described carbon nano tube structure comprises the carbon nano-tube of ordered arrangement, and carbon nano-tube is arranged of preferred orient along a fixed-direction.
Described carbon nano tube structure is a self supporting structure, and so-called " self supporting structure " i.e. this carbon nano tube structure, without by a support body supports, also can keep self specific shape.Attract each other by Van der Waals force between a plurality of carbon nano-tube in the carbon nano tube structure of this self supporting structure, thereby make carbon nano tube structure there is specific shape.Therefore support body supports can be passed through in the two ends of this carbon nano tube structure, and makes the unsettled setting of carbon nano tube structure other parts, thereby fully with ambient gas or liquid medium, contact.In addition, this carbon nano tube structure also can directly be arranged at a substrate surface.
Described carbon nano tube structure has larger specific area, thereby has the large surface area contacted with extraneous gas or liquid medium.Preferably, carbon nano tube structure is stratiform, wire or other shape, and has larger specific area.
When this carbon nano tube structure is layer structure, thickness is preferably 0.5 nanometer～1 millimeter.The thickness of described carbon nano tube structure is too large, and specific area reduces, and thermal capacitance increases; The thickness of described carbon nano tube structure is too little, and mechanical strength is poor, and durability is good not.When this carbon nano tube structure Thickness Ratio hour, for example be less than 10 microns, this carbon nano tube structure has good light transmission rate.Carbon nano-tube in this carbon nano tube structure comprises one or more in Single Walled Carbon Nanotube, double-walled carbon nano-tube and multi-walled carbon nano-tubes.The diameter of described Single Walled Carbon Nanotube is 0.5 nanometer～50 nanometers, and the diameter of described double-walled carbon nano-tube is 1.0 nanometers～50 nanometers, and the diameter of described multi-walled carbon nano-tubes is 1.5 nanometers～50 nanometers.
The concrete structure that is appreciated that described carbon nano tube structure is not limit, and preferably, this carbon nano tube structure meets following condition, that is: have larger specific area and less unit are thermal capacitance and (be less than 2 * 10
-4every square centimeter of Kelvin of joule, preferably, be less than 1 * 10
-6every square centimeter of Kelvin of joule).
Described carbon nano tube structure comprises the composite construction that at least one carbon nano-tube film, at least one liner structure of carbon nano tube or described carbon nano-tube film and liner structure of carbon nano tube form.
Even carbon nanotube in described carbon nano-tube film distributes, and crosses Van der Waals force and combine closely.Carbon nano-tube in this carbon nano-tube film is unordered or ordered arrangement.The orientation of the unordered finger carbon nano-tube here is random; The orientation that refers in order at least most carbon nano-tube has certain rule, as substantially along a fixed-direction preferred orientation or substantially along several fixed-direction preferred orientations.Particularly, when carbon nano-tube film comprises the carbon nano-tube of lack of alignment, carbon nano-tube is wound around mutually or isotropism is arranged; When carbon nano-tube film comprises the carbon nano-tube of ordered arrangement, carbon nano-tube is arranged of preferred orient along a direction or multiple directions.
Preferably, described carbon nano-tube film is one directly to pull the ordered carbon nanotube film of acquisition from super in-line arrangement carbon nano pipe array.The thickness of this carbon nano-tube film is 0.5 nanometer～100 micron, and this carbon nano-tube film length is not limit, the width that width is carbon nano pipe array.Refer to Fig. 4 and Fig. 5, further, in described carbon nano tube structure, carbon nano-tube film comprises that a plurality of carbon nano-tube join end to end and are arranged of preferred orient and be uniformly distributed along pulling direction.Particularly, described carbon nano-tube film comprises a plurality of carbon nano-tube fragments 143 that join end to end and align, and each carbon nano-tube fragment 143 has length about equally, and carbon nano-tube fragment 143 two ends interconnect by Van der Waals force.This carbon nano-tube fragment 143 comprises the carbon nano-tube 145 that a plurality of length substantially equates and is arranged parallel to each other.When described carbon nano tube structure comprises mutual stacked setting of multilayer carbon nanotube film, there is an intersecting angle α between the carbon nano-tube in the adjacent two layers carbon nano-tube film, α is more than or equal to 0 degree and is less than or equal to 90 degree.The light transmission rate of described single-layer carbon nano-tube film is 67%～95%.Structure of described carbon nano-tube film and preparation method thereof refers to the people such as Fan Shoushan in application on February 9th, 2007, in No. 200710073265.4th, disclosed Chinese patent application on August 13rd, 2008.For saving space, only be incorporated in this, but all technology of above-mentioned application disclose the part that also should be considered as the exposure of the present patent application technology.
Described liner structure of carbon nano tube comprises the twisted wire structure that is arranged parallel to each other at least one carbon nano tube line, a plurality of carbon nano tube line the fascicular texture that forms or the mutual twisted arrangement of a plurality of carbon nano tube line form.This carbon nano tube line is the carbon nano tube line of torsion or the carbon nano tube line of non-torsion.Described carbon nano tube structure can comprise the layer structure that a liner structure of carbon nano tube or a plurality of liner structure of carbon nano tube are arranged side by side, mutually intersect or braiding forms mutually, thereby makes this carbon nano tube structure have larger specific area.
Refer to Fig. 6, the carbon nano tube line of this non-torsion is for processing the above-mentioned carbon nano-tube film that pulls acquisition from super in-line arrangement carbon nano pipe array to obtain through organic solvent.Particularly, organic solvent is infiltrated to the whole surface of described carbon nano-tube film, under the capillary effect produced when volatile organic solvent volatilizees, a plurality of carbon nano-tube that are parallel to each other in carbon nano-tube film are combined closely by Van der Waals force, thereby make carbon nano-tube film be punctured into the carbon nano tube line of a non-torsion.This organic solvent is volatile organic solvent, as ethanol, methyl alcohol, acetone, dichloroethanes or chloroform.The carbon nano tube line of the non-torsion of processing by organic solvent is compared with the carbon nano-tube film of processing without organic solvent, and specific area reduces, and viscosity reduces.The carbon nano tube line of this non-torsion comprises a plurality of along the arrangement of carbon nano tube line length direction end to end carbon nano-tube.Particularly, the carbon nano tube line of this non-torsion comprises a plurality of carbon nano-tube fragments, and the plurality of carbon nano-tube fragment joins end to end by Van der Waals force, and each carbon nano-tube fragment comprises a plurality of carbon nano-tube that are parallel to each other and combine closely by Van der Waals force.This carbon nano-tube fragment has length, thickness, uniformity and shape arbitrarily.This carbon nano-tube line length is not limit, and diameter is 0.5 nanometer-100 micron.Described carbon nano tube line and preparation method thereof refers to the people such as Fan Shoushan in application on December 16th, 2005, in No. 200510120716.6th, disclosed Chinese patent application on June 20th, 2007.For saving space, only be incorporated in this, but all technology of above-mentioned application disclose the part that also should be considered as the exposure of the present patent application technology.
Refer to Fig. 7, the carbon nano tube line of this torsion is for reversing the above-mentioned carbon nano-tube film that pulls acquisition from super in-line arrangement carbon nano pipe array to obtain through a mechanical force.The carbon nano tube line of this torsion comprises a plurality of carbon nano-tube of arranging around the carbon nano tube line axial screw.Particularly, the carbon nano tube line of this torsion comprises a plurality of carbon nano-tube fragments, and the plurality of carbon nano-tube fragment joins end to end by Van der Waals force, and each carbon nano-tube fragment comprises a plurality of carbon nano-tube that are parallel to each other and combine closely by Van der Waals force.This carbon nano-tube fragment has length, thickness, uniformity and shape arbitrarily.The carbon nano-tube line length of this torsion is not limit, and diameter is 0.5 nanometer-100 micron.Further, can adopt a volatile organic solvent to process the carbon nano tube line of this torsion.Under the capillary effect produced when volatile organic solvent volatilizees, carbon nano-tube adjacent in the carbon nano tube line of the torsion after processing is combined closely by Van der Waals force, and the specific area of the carbon nano tube line of torsion is reduced, and density and intensity increase.
Described carbon nano tube structure can comprise the composite construction that liner structure of carbon nano tube and carbon nano-tube film form, this at least one liner structure of carbon nano tube is arranged between a carbon nano-tube film surface or two overlapping carbon nano-tube films, thereby makes this carbon nano tube structure have higher intensity.
Described electrode 124 is spaced and be electrically connected to described carbon nano tube structure.This amplification voltage signal puts on carbon nano tube structure by electrode 124, thereby make the inner alternating current produced corresponding to this amplification voltage signal of carbon nano tube structure, thereby make this carbon nano tube structure evolution of heat, and the circumference medium, and then send the appreciable sound of people's ear.Described electrode 124 is formed by electric conducting material, and its concrete shape structure is not limit.Particularly, described electrode 124 may be selected to be stratiform, bar-shaped, block or other shape.The material of described electrode 124 may be selected to be metal, conducting polymer, conducting resinl, metallic carbon nanotubes, indium tin oxide (ITO) etc.In the embodiment of the present invention, described at least two electrodes 124 are for being arranged at intervals at the metal bar on described carbon nano tube structure surface.
Because carbon nano-tube has great specific area, under the effect of Van der Waals force, this carbon nano tube structure itself has good adhesiveness, therefore can directly contact and be adhered fixed between described electrode 124 and described carbon nano tube structure, and formation well electrically contacts, in addition, can adopt the conduction tack coat that electrode 124 is adhered fixed in the carbon nano tube structure surface.
Carbon nano-tube in carbon nano tube structure is during for ordered arrangement in a certain direction, preferably, the direction of the orientation of described carbon nano-tube along an electrode 124 to another electrode 124 extended, should there is a substantially equal spacing between two electrodes 124, thereby make the carbon nano-tube between two electrodes 124 can there is a substantially equal resistance value.In the present embodiment, described carbon nano-tube is arranged along basic vertical these stick electrode 124 length directions.
Preferably, the length of described electrode 124 is more than or equal to the width of carbon nano tube structure, thereby can make whole carbon nano tube structure all be utilized.Voltage signal after described electrode 124 makes to amplify imports in carbon nano tube structure equably, and the carbon nano-tube in carbon nano tube structure converts electric energy to heat energy, the circumference medium, and the density that changes surrounding medium is sounded.This medium can be gas or liquid.
Be appreciated that described electrode 124 is selectable structure.The output 114 of described power amplifier 14 can directly be electrically connected to described carbon nano tube structure by modes such as wire or contact conductors.In addition, between any output 114 of realizing described power amplifier 14 and described carbon nano tube structure, be electrically connected to, make the connected mode of input one amplification voltage signal in carbon nano tube structure all within protection scope of the present invention.
Be appreciated that described thermic sounding component 122 is not limited to above-mentioned carbon nano tube structure.The structure of any conversion thermic sounding that can be by " electricity-Re-sound " is all in protection scope of the present invention.Particularly, this thermic sounding component 122 should have less unit are thermal capacitance and (as is less than 2 * 10
-4joule every square centimeter of Kelvin), and be one to have than the conductive structure of bigger serface and less thickness, thereby make this thermic sounding component 122 electric energy of input can be converted to heat energy, and carry out fully fast heat exchange with surrounding medium.Preferably, this thermic sounding component 122 should be self supporting structure.The thermic sounding component 122 of this self supporting structure can contact and carry out heat exchange fully with surrounding medium.
Further, when this power amplifier 14 can not add bias voltage by the amplification voltage signal of its output, for making this loud speaker 12 can better send the sound of normal frequency, this speaker system 10 can comprise a frequency down circuit 16, the frequency of the audio electrical signal that this frequency down circuit 16 is sent this audio signal source 20 reduces, for example reduce by one times, and input to this power amplifier 14.The function of this frequency down circuit 16 is understandable that, within also can be integrated in the circuit of power amplifier 14.
Described speaker system 10 can further comprise a plurality of loud speakers 12 and a frequency divider, and this frequency divider is electrically connected to output 114 or the input 112 of power amplifier 14.When this frequency divider is connected with the output 114 of power amplifier 14, amplification voltage signal is divided into to a plurality of signals of different frequency range, and transfers to respectively a plurality of loud speakers 12.When this frequency divider is connected with the input 112 of power amplifier 14, this frequency divider first is divided into audio electrical signal a plurality of signals of different frequency range, then amplifies by a plurality of power amplifiers 14.
Because this drives the conversion that the principle of thermic sounding component 122 sounding is " electricity-Re-sound ", no matter this audio electrical signal is at the positive half period of energy changing or this thermic sounding component 122 of heating of the equal energy equivalence of negative half-cycle, therefore the frequency that this thermic sounding component 122 produces heat is one times of the audio electrical signal frequency, the audible frequency of this thermic sounding component 122 is frequency multiplication.Therefore, frequency for correct this audio electrical signal of reduction, make this thermic sounding component 122 send the sound of normal frequency, need this audio electrical signal frequency reducing maybe by this amplification voltage signal biasing, this speaker system 10 need comprise the power amplifier 14 of the amplification voltage signal that a frequency down circuit 16 or can output offset.If itself has passed through down conversion process this audio electrical signal, as utilized software by the digital signal frequency reducing in computer, this audio electrical signal can directly amplify by a common power amplifier 14, and drives this thermic sounding component 122 sounding.
In use, described amplification voltage signal conducts to thermic sounding component 122 inside to above-mentioned speaker system 10.Because thermic sounding component 122 has certain resistance, when electric current flows through this thermic sounding component 122, this thermic sounding component 122 converts electrical energy into heat energy.Because having less unit are thermal capacitance, thermic sounding component 122 (is less than 2 * 10
-4every square centimeter of Kelvin of joule, preferably, be less than 1 * 10
-6every square centimeter of Kelvin of joule), after input signal, variation according to signal strength signal intensity (as voltage strength), this thermic sounding component 122 carries out heat exchange fast with surrounding medium under the effect of audio electrical signal, according to medium, the heating and cooling rapidly of the frequency circumference of audio electrical signal, produce periodic variations in temperature, and carry out the Rapid Thermal exchange with surrounding medium, enclose the heating of medium due to thermic sounding component 122, its density changes according to the frequency shift of audio electrical signal, make surrounding medium expand rapidly and shrink, thereby sound.The frequency range of the sound that this thermic sounding component 122 sends wider (1Hz～100kHz), sounding effect are better.As shown in Figure 8, the embodiment of the present invention adopts the speaker system 10 of the carbon nano-tube film of one deck A4 paper size as thermic sounding component 122, at input voltage, be under 50 laid shoot parts, one microphone is arranged at over against this carbon nano tube structure, and interval 5 centimeters, the intensity of phonation that records this carbon nano-tube film can reach 105 dB sound pressure levels (dBSPL), and the audible frequency scope is 100 hertz to 100,000 hertz (being 100Hz～100kHz).
The speaker system 10 that the embodiment of the present invention provides has the following advantages: one, described speaker system is using the thermic sounding component as a transducing head, by electric energy, be acoustic energy, this speaker system is simple, and when this thermic sounding component is a carbon nano tube structure, have lightweight, volume is little, mechanical strength is high and the excellent properties such as high temperature resistant, therefore this speaker system can be applicable to than wide-range.Its two, described speaker system is without other labyrinths such as magnet, therefore the structure of this speaker system is comparatively simple, is conducive to reduce the cost of this speaker system.They are three years old, the audio electrical signal of the outside input of this speaker system utilization causes this thermic sounding component variations in temperature, thereby make its surrounding medium expand rapidly and shrink, and then send sound wave, the conversion that principle of sound is " electricity-Re-sound ", therefore this speaker system can be worked under the condition without magnetic, is with a wide range of applications.They are four years old, because the thermic sounding component has less unit are thermal capacitance and large specific area, after input signal, variation according to signal strength signal intensity (as current strength), the gas medium of circumference, rapidly heating and cooling equably, produce periodic variations in temperature, and carry out the Rapid Thermal exchange with surrounding gas medium, make surrounding gas medium expand rapidly and shrink, send the appreciable sound of people's ear, and the frequency range of the sound sent wider (1Hz～100kHz), sounding effect are better.Its five, because carbon nano tube structure has mechanical strength and toughness preferably, durability is better, thereby is conducive to various shapes, the speaker system of size that preparation is comprised of carbon nano tube structure, and then is conveniently used in various fields.Its six, therefore because carbon nano tube structure has transparency preferably, can be used as a transparent loudspeaker and be applied in speaker system.
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, within all should being included in the present invention's scope required for protection.
Claims (9)
1. a speaker system, it comprises:
One loud speaker; And
One power amplifier, it is amplification voltage signal by the audio electrical signal power amplification of reception that this power amplifier is used for, and drives this loud speaker sounding;
It is characterized in that: this loud speaker comprises a thermic sounding component and at least two electrode gap settings and is electrically connected to this thermic sounding component, these at least two electrodes are for inputing to this thermic sounding component by above-mentioned amplification voltage signal, this thermic sounding component comprises at least one carbon nano-tube film or at least one liner structure of carbon nano tube, this carbon nano-tube film or liner structure of carbon nano tube comprise a plurality of carbon nano-tube, this thermic sounding component, for changing the electric energy of amplification voltage signal into heat energy, changes thermic sounding component ambient density and sends sound wave.
2. speaker system as claimed in claim 1, is characterized in that, described power amplifier is further used for the additional bias voltage of this amplification voltage signal.
3. speaker system as claimed in claim 1, is characterized in that, described power amplifier comprises:
One triode, this triode has a base stage, an emitter and a collector electrode, this emitter is connected with described loud speaker one electrode;
One electric capacity, described audio electrical signal inputs to the base stage of this triode by this electric capacity;
One direct current voltage source is connected with another electrode of this loud speaker,
One first resistance, this direct voltage source is connected to the base stage of this triode by this first resistance;
One second resistance, the base stage of this triode is by this second grounding through resistance; And
One the 3rd resistance, this collector electrode is by the 3rd grounding through resistance.
4. speaker system as claimed in claim 1, is characterized in that, the unit are thermal capacitance of described thermic sounding component is less than 2 * 10
-4every square centimeter of Kelvin of joule.
5. speaker system as claimed in claim 1, is characterized in that, described carbon nano tube structure comprises the combination of described at least one carbon nano-tube film and at least one liner structure of carbon nano tube.
6. speaker system as claimed in claim 5, is characterized in that, described a plurality of carbon nano-tube join end to end by Van der Waals force.
7. speaker system as claimed in claim 1, it is characterized in that, described speaker system further comprises a frequency down circuit, described audio signal source is electrically connected to the input of this power amplifier by this frequency down circuit, and this frequency down circuit is used for described audio electrical signal frequency reducing and transfers to this power amplifier.
8. speaker system as claimed in claim 1, it is characterized in that, described speaker system further comprises a plurality of loud speakers and a frequency divider, and this frequency divider is electrically connected to described a plurality of loud speakers respectively and a plurality of audio electrical signals that this audio electrical signal is divided into different frequency range are transferred to respectively to the plurality of loud speaker.
9. speaker system as claimed in claim 1, is characterized in that, described speaker system further comprises an audio signal source, for generation of an audio electrical signal and be passed to described power amplifier.
Priority Applications (23)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101058085A CN101820571B (en) | 2009-02-27 | 2009-02-27 | Speaker system |
| US12/387,100 US8199938B2 (en) | 2008-04-28 | 2009-04-28 | Method of causing the thermoacoustic effect |
| US12/387,089 US8068624B2 (en) | 2008-04-28 | 2009-04-28 | Thermoacoustic device |
| US12/455,606 US8249279B2 (en) | 2008-04-28 | 2009-06-04 | Thermoacoustic device |
| US12/459,051 US8019100B2 (en) | 2008-04-28 | 2009-06-25 | Thermoacoustic device |
| US12/459,046 US8050430B2 (en) | 2008-04-28 | 2009-06-25 | Thermoacoustic device |
| US12/459,041 US8019099B2 (en) | 2008-04-28 | 2009-06-25 | Thermoacoustic device |
| US12/459,053 US8073165B2 (en) | 2008-04-28 | 2009-06-25 | Thermoacoustic device |
| US12/459,040 US8073163B2 (en) | 2008-04-28 | 2009-06-25 | Thermoacoustic device |
| US12/459,038 US8019097B2 (en) | 2008-04-28 | 2009-06-25 | Thermoacoustic device |
| US12/459,052 US8073164B2 (en) | 2008-04-28 | 2009-06-25 | Thermoacoustic device |
| US12/459,039 US8019098B2 (en) | 2008-04-28 | 2009-06-25 | Thermoacoustic device |
| US12/459,054 US8068625B2 (en) | 2008-04-28 | 2009-06-25 | Thermoacoustic device |
| US12/459,495 US8059841B2 (en) | 2008-04-28 | 2009-07-02 | Thermoacoustic device |
| US12/459,543 US8050431B2 (en) | 2008-04-28 | 2009-07-02 | Thermoacoustic device |
| US12/459,564 US8068626B2 (en) | 2008-04-28 | 2009-07-02 | Thermoacoustic device |
| US12/459,565 US8259966B2 (en) | 2008-04-28 | 2009-07-02 | Acoustic system |
| US12/589,462 US8259967B2 (en) | 2008-04-28 | 2009-10-22 | Thermoacoustic device |
| US12/590,258 US8452031B2 (en) | 2008-04-28 | 2009-11-05 | Ultrasonic thermoacoustic device |
| US12/590,291 US8259968B2 (en) | 2008-04-28 | 2009-11-05 | Thermoacoustic device |
| US12/655,502 US8270639B2 (en) | 2008-04-28 | 2009-12-31 | Thermoacoustic device |
| JP2010020346A JP2010206785A (en) | 2009-02-27 | 2010-02-01 | Thermoacoustic device |
| JP2013033226A JP5685612B2 (en) | 2009-02-27 | 2013-02-22 | Thermoacoustic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101058085A CN101820571B (en) | 2009-02-27 | 2009-02-27 | Speaker system |
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| CN103841506B (en) | 2012-11-20 | 2017-09-01 | 清华大学 | The preparation method of thermophone array |
| CN103841507B (en) | 2012-11-20 | 2017-05-17 | 清华大学 | Preparation method for thermotropic sound-making device |
| CN103841482B (en) * | 2012-11-20 | 2017-01-25 | 清华大学 | Earphone set |
| CN103841479B (en) * | 2012-11-20 | 2017-08-08 | 清华大学 | Earphone set |
| CN103905964B (en) * | 2012-12-29 | 2017-11-14 | 清华大学 | Thermo-acoustic device |
| WO2015111603A1 (en) * | 2014-01-24 | 2015-07-30 | 国立大学法人東京大学 | Ultrasound generation element |
| CN109070542B (en) | 2016-06-10 | 2021-03-09 | 琳得科美国股份有限公司 | Nanofiber sheet |
| US10590539B2 (en) | 2017-02-24 | 2020-03-17 | Lintec Of America, Inc. | Nanofiber thermal interface material |
| CN112055295B (en) * | 2020-08-24 | 2021-11-09 | 清华大学 | Method and system for driving thermoacoustic device by using digitized real-time audio signal |
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| JP2013128323A (en) | 2013-06-27 |
| JP5685612B2 (en) | 2015-03-18 |
| CN101820571A (en) | 2010-09-01 |
| JP2010206785A (en) | 2010-09-16 |
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