CN101820571A - Speaker system - Google Patents
Speaker system Download PDFInfo
- Publication number
- CN101820571A CN101820571A CN200910105808A CN200910105808A CN101820571A CN 101820571 A CN101820571 A CN 101820571A CN 200910105808 A CN200910105808 A CN 200910105808A CN 200910105808 A CN200910105808 A CN 200910105808A CN 101820571 A CN101820571 A CN 101820571A
- Authority
- CN
- China
- Prior art keywords
- carbon nano
- speaker system
- tube
- power amplifier
- speaker
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003321 amplification Effects 0.000 claims abstract description 26
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 148
- 239000002041 carbon nanotube Substances 0.000 claims description 77
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 77
- 239000002238 carbon nanotube film Substances 0.000 claims description 32
- 238000005411 Van der Waals force Methods 0.000 claims description 12
- 230000005236 sound signal Effects 0.000 claims description 12
- 230000009466 transformation Effects 0.000 abstract 1
- 239000003960 organic solvent Substances 0.000 description 9
- 230000005291 magnetic effect Effects 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000002079 double walled nanotube Substances 0.000 description 2
- 210000003027 ear inner Anatomy 0.000 description 2
- 210000003128 head Anatomy 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002048 multi walled nanotube Substances 0.000 description 2
- 239000002086 nanomaterial Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002109 single walled nanotube Substances 0.000 description 2
- 230000002463 transducing effect Effects 0.000 description 2
- SCYULBFZEHDVBN-UHFFFAOYSA-N 1,1-Dichloroethane Chemical class CC(Cl)Cl SCYULBFZEHDVBN-UHFFFAOYSA-N 0.000 description 1
- 102000029749 Microtubule Human genes 0.000 description 1
- 108091022875 Microtubule Proteins 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009954 braiding Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002322 conducting polymer Substances 0.000 description 1
- 229920001940 conductive polymer Polymers 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 230000010358 mechanical oscillation Effects 0.000 description 1
- 229910021404 metallic carbon Inorganic materials 0.000 description 1
- 210000004688 microtubule Anatomy 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
Landscapes
- Carbon And Carbon Compounds (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
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 to receive an audio electrical signal, and with 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.Though their working method difference generally is by producing mechanical oscillation and promotes ambient air, thereby makes air dielectric produce the conversion that fluctuation realizes " electricity-Li-sound ".Wherein, dynamic speaker is most widely used.
A voice coil loudspeaker voice coil is placed in the magnetic field that changes in the existing dynamic speaker, and produces vibration with changes of magnetic field, and the vibrations of voice coil loudspeaker voice coil drive the vibrating diaphragm vibration that is attached thereto 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 the prior art, its structure is all comparatively complicated, is difficult to lightening and miniaturization.
Since the early 1990s, (see also Helical microtubules of graphitic carbon, Nature, Sumio Iijima with carbon nano-tube, vol 354, p56 (1991)) caused that with its particular structure and character people pay close attention to greatly for the nano material of representative.Yet single-root carbon nano-tube is a nanoscale, and a large amount of carbon nano-tube are easily reunited, and is difficult for disperseing to form uniform carbon nano-tube film, thereby has limited the application of carbon nano-tube in macroscopical field.People such as Jiang Kaili on September 16th, 2002 application and on August 20th, 2008 bulletin the patent No. be to have disclosed a kind of carbon nano-tube rope in 02134760.3 the Chinese patent, this carbon nano-tube rope comprises by the end to end carbon nano-tube bundle fragment of Van der Waals force, and the carbon nano-tube in this carbon nano-tube rope is arranged along same direction substantially.This carbon nano-tube rope can be used for carbon nano-tube macroscopical field easily.
In recent years, along with deepening continuously of carbon nano-tube and nano materials research, its wide application prospect constantly displayed.For example, because performances such as the electromagnetism of the uniqueness that carbon nano-tube had, 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, do not find as yet but in the 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 work under the condition of no magnetic, and have the audible frequency scope of broad and higher intensity of phonation.
A kind of speaker system, it comprises: a loud speaker; And a power amplifier, this power amplifier is an amplification voltage signal with the audio electrical signal power amplification that receives, 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 with this thermic sounding component that these at least two electrodes input to amplification voltage signal in this thermic sounding component.This speaker system is applied to electroacoustic conversion field, and is simple in structure, can work under the condition of no magnetic, and have the audible frequency scope of broad and higher intensity of phonation.
Compared with prior art, described speaker system has the following advantages: one, described speaker system with the thermic sounding component as a transducing head, is acoustic energy with electric energy by thermal power transfer, need not other labyrinths such as magnet, so the structure of this speaker system is comparatively simple, helps reducing 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 its surrounding medium is expanded rapidly and shrinks, and then sends sound wave, need not vibrating diaphragm, so this speaker system can be worked under the condition of no magnetic.
Description of drawings
Fig. 1 is the annexation schematic diagram of embodiment of the invention speaker system.
Fig. 2 is the operating circuit schematic diagram of embodiment of the invention speaker system.
Fig. 3 is the voltage bias mode schematic diagram of embodiment of the invention speaker system.
Fig. 4 is the structural representation of the carbon nano-tube fragment of carbon nano tube structure in the embodiment of the invention speaker system.
Fig. 5 is the stereoscan photograph of carbon nano-tube film in the embodiment of the invention speaker system.
Fig. 6 is the stereoscan photograph of carbon nano tube line in the embodiment of the invention speaker system.
Fig. 7 is the stereoscan photograph of carbon nano-tube stranded wire in the embodiment of the invention speaker system.
Fig. 8 is the frequency response characteristic of loud speaker in the embodiment of the invention speaker system.
Embodiment
Describe embodiment of the invention speaker system in detail below with reference to accompanying drawing.
See also Fig. 1, the embodiment of the 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 with this loud speaker 12.This audio signal source 20 is electrically connected with 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 with this audio signal source 20.Particularly, this audio signal source 20 has an audio electrical signal output.This power amplifier 14 is electrically connected with 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 with an audio signal source 20, and this output 114 is electrically connected with 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.See also Fig. 2, in the present embodiment, described power amplifier 14 is the category-A power amplifier, and it comprises at least one 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 with the output of audio signal source 20, and the other end is electrically connected with 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 first resistance R 1 is connected.Ground connection after the base stage B of this triode connects with 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 can be according to the amplification voltage signal of audio signal source 20 to described thermic sounding component 12 conduction one biasing; 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.See also 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 provided with at interval and are electrically connected with this thermic sounding component 122.Two outputs 114 of described power amplifier 14 are connected to two electrodes 124 of this thermic sounding component 122 respectively.In the present embodiment, the emitter E of this power amplifier 14 directly is electrically connected with an electrode 124 of this loud speaker 12, this direct voltage source Vcc directly is electrically connected with 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 adjacent electrodes 124 are electrically connected with two outputs 114 of described power amplifier 14 respectively arbitrarily, make input one amplification voltage signal in the thermic sounding component 122 of this power amplifier 14 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 these a plurality of carbon nano-tube are in contact with one another, thereby forms a uniform conductive network.Preferably, described carbon nano tube structure comprises orderly carbon nanotubes arranged, 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 need not 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 have specific shape.So 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 contacts with ambient gas or liquid medium.In addition, this carbon nano tube structure also can directly be arranged at a substrate surface.
Described carbon nano tube structure has bigger specific area, thereby has the large surface area that contacts with extraneous gas or liquid medium.Preferably, carbon nano tube structure is stratiform, wire or other shape, and has bigger specific area.
When this carbon nano tube structure was layer structure, thickness was preferably 0.5 nanometer～1 millimeter.The thickness of described carbon nano tube structure is too big, and then specific area reduces, and thermal capacitance increases; The thickness of described carbon nano tube structure is too little, and then mechanical strength is relatively poor, and durability is good inadequately.When this carbon nano tube structure thickness was smaller, for example less than 10 microns, this carbon nano tube structure had 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 the 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 satisfies following condition, has bigger specific area and less unit are thermal capacitance (less than 2 * 10 that is:
-4Every square centimeter of Kelvin of joule, preferably, 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 are formed.
Even carbon nanotube in the 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 orderly arrangement.The orientation of the unordered finger carbon nano-tube here is random; The orientation that refers to most at least carbon nano-tube in order 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 comprised the carbon nano-tube of lack of alignment, carbon nano-tube was twined mutually or isotropism is arranged; When carbon nano-tube film comprised orderly carbon nanotubes arranged, carbon nano-tube was arranged of preferred orient along a direction or a plurality of direction.
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, and width is the width of carbon nano pipe array.See also Fig. 4 and Fig. 5, further, carbon nano-tube film comprises that a plurality of carbon nano-tube join end to end and are arranged of preferred orient and evenly distribute along pulling direction in the described carbon nano tube structure.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 equate substantially and are arranged parallel to each other.When described carbon nano tube structure comprises that the multilayer carbon nanotube film mutually during stacked the setting, has 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 smaller 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 sees also people such as Fan Shoushan in application on February 9th, 2007, in No. the 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 formed or the mutual twisted arrangement of a plurality of carbon nano tube line form.This carbon nano tube line is carbon nano tube line or the non-carbon nano tube line that reverses that reverses.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, intersect mutually or mutual braiding forms, thereby makes this carbon nano tube structure have bigger specific area.
See also Fig. 6, this non-carbon nano tube line that reverses obtains for the above-mentioned carbon nano-tube film that pulls acquisition from super in-line arrangement carbon nano pipe array is handled through organic solvent.Particularly, organic solvent is soaked into the whole surface of described carbon nano-tube film, under the capillary effect that when volatile organic solvent volatilizees, produces, the a plurality of carbon nano-tube that are parallel to each other in the carbon nano-tube film are combined closely by Van der Waals force, thereby make carbon nano-tube film be punctured into a non-carbon nano tube line that reverses.This organic solvent is a volatile organic solvent, as ethanol, methyl alcohol, acetone, dichloroethanes or chloroform.Compare with the carbon nano-tube film of handling without organic solvent by the non-carbon nano tube line that reverses that organic solvent is handled, specific area reduces, and viscosity reduces.This non-carbon nano tube line that reverses comprises a plurality of along arrangement of carbon nano tube line length direction and end to end carbon nano-tube.Particularly, this non-carbon nano tube line that reverses comprises a plurality of carbon nano-tube fragments, and these a plurality of carbon nano-tube fragments join 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 sees also people such as Fan Shoushan in application on December 16th, 2005, in No. the 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.
See also Fig. 7, this carbon nano tube line that reverses is for to reverse acquisition with the above-mentioned carbon nano-tube film that pulls acquisition from super in-line arrangement carbon nano pipe array through a mechanical force.This carbon nano tube line that reverses comprises a plurality of around carbon nano tube line axial screw carbon nanotubes arranged.Particularly, this carbon nano tube line that reverses comprises a plurality of carbon nano-tube fragments, and these a plurality of carbon nano-tube fragments join 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 that this reverses is not limit, and diameter is 0.5 nanometer-100 micron.Further, can adopt a volatile organic solvent to handle the carbon nano tube line that this reverses.Under the capillary effect that produces when volatile organic solvent volatilizees, adjacent carbon nano-tube is combined closely by Van der Waals force in the carbon nano tube line that reverses after the processing, and the specific area of the carbon nano tube line that reverses 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 are formed, this at least one liner structure of carbon nano tube is arranged between carbon nano-tube film surface or two the overlapping carbon nano-tube films, thereby makes this carbon nano tube structure have higher intensity.
Described electrode 124 is provided with at interval and is electrically connected with described carbon nano tube structure.This amplification voltage signal puts on carbon nano tube structure by electrode 124, thereby make the inner alternating current that produces 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 and 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 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, so can directly contact and be adhered fixed between described electrode 124 and the 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.
When the carbon nano-tube in the carbon nano tube structure when arranging in order 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 have a basic spacing that equates between two electrodes 124, thereby make the carbon nano-tube between two electrodes 124 can have a basic resistance value that equates.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 obtain utilizing.Described electrode 124 imports in the carbon nano tube structure voltage signal after the amplification equably, and the carbon nano-tube in the 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 with described carbon nano tube structure by modes such as lead or contact conductors.In addition, be electrically connected between any output 114 of realizing described power amplifier 14 and the described carbon nano tube structure, the connected mode that makes input one amplification voltage signal in the carbon nano tube structure is 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 (as less than 2 * 10
-4Joule every square centimeter of Kelvin), and is one to have conductive structure, thereby makes this thermic sounding component 122 electric energy of input can be converted to heat energy, and carry out heat exchange fully fast with surrounding medium than bigger serface and less thickness.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 with 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, this frequency down circuit 16 reduces the frequency of the audio electrical signal that this audio signal source 20 sends, for example reduce by one times, and input to this power amplifier 14.Be understandable that the function of this frequency down circuit 16 also can be integrated within 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 with the 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 a plurality of signals of different frequency range, and transfers to a plurality of loud speakers 12 respectively.When this frequency divider was connected with the input 112 of power amplifier 14, this frequency divider was divided into audio electrical signal a plurality of signals of different frequency range earlier, amplified by a plurality of power amplifiers 14 again.
Because this principle that drives thermic sounding component 122 sounding is the conversion of " 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, so the frequency that this thermic sounding component 122 produces heat is one times of the audio electrical signal frequency, promptly the audible frequency of this thermic sounding component 122 is a 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 with this amplification voltage signal biasing, promptly 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 utilizing software with 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.
Above-mentioned speaker system 10 in use, described amplification voltage signal conducts to thermic sounding component 122 inside.Because thermic sounding component 122 has certain resistance, when electric current flow through this thermic sounding component 122, this thermic sounding component 122 converted electrical energy into heat energy.Because thermic sounding component 122 has less unit are thermal capacitance (less than 2 * 10
-4Every square centimeter of Kelvin of joule, preferably, less than 1 * 10
-6Every square centimeter of Kelvin of joule), behind 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 and surrounding medium carry out Rapid Thermal exchange, enclose medium because the heating of thermic sounding component 122, its density changes according to the frequency shift of audio electrical signal, surrounding medium is expanded rapidly and contraction, thereby sound.(1Hz～100kHz), sounding effect are better for the frequency range broad of the sound that this thermic sounding component 122 is sent.As shown in Figure 8, the embodiment of the 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 is under the 50 laid shoot spares, 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 it (is 100Hz～100kHz) that the audible frequency scope is 100 hertz to 100,000 hertz.
The speaker system 10 that the embodiment of the invention provides has the following advantages: one, described speaker system with the thermic sounding component as a transducing head, with electric energy is acoustic energy, this speaker system is simple, and when this thermic sounding component is a carbon nano tube structure, have in light weight, volume is little, mechanical strength is high and excellent properties such as high temperature resistant, so this speaker system can be applicable to than wide-range.Its two, described speaker system need not other labyrinths such as magnet, so the structure of this speaker system is comparatively simple, helps reducing 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 its surrounding medium is expanded and contraction rapidly, and then send sound wave, the sounding principle is the conversion of " electricity-Re-sound ", so this speaker system can be worked under the condition of no 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 big specific area, behind 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 and surrounding gas medium carry out Rapid Thermal exchange, surrounding gas medium is expanded rapidly and contraction, send the appreciable sound of people's ear, and the frequency range broad of the sound that is sent (1Hz～100kHz), sounding effect are better.Its five because carbon nano tube structure has mechanical strength and toughness preferably, durability is better, thereby helps preparing the different shape of being made up of carbon nano tube structure, the speaker system of size, and then is conveniently used in various fields.Its six because carbon nano tube structure has transparency preferably, therefore can be used as a transparent loudspeaker and be applied in the 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 all should be included within the present invention's scope required for protection.
Claims (11)
1. speaker system, it comprises:
One loud speaker; And
The audio electrical signal power amplification that one power amplifier, this power amplifier are used for receiving is an amplification voltage signal, 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 with this thermic sounding component that these at least two electrodes are used for above-mentioned amplification voltage signal is inputed to this thermic sounding component.
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 links to each other with described loud speaker one electrode;
One electric capacity, described audio electrical signal input to the base stage of this triode by this electric capacity;
One direct current voltage source links to each other with another electrode of this loud speaker,
One first resistance, this direct voltage source are 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, described thermic sounding component is used for changing amplification voltage signal into heat energy, changes thermic sounding component ambient density and sends sound wave.
5. 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.
6. speaker system as claimed in claim 1 is characterized in that, described thermic sounding component comprises a carbon nano tube structure.
7. speaker system as claimed in claim 6 is characterized in that, described carbon nano tube structure comprises at least one carbon nano-tube film, at least one liner structure of carbon nano tube or its combination.
8. speaker system as claimed in claim 7 is characterized in that, described carbon nano-tube film or liner structure of carbon nano tube comprise that a plurality of carbon nano-tube join end to end by Van der Waals force.
9. 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 with 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.
10. speaker system as claimed in claim 1, it is characterized in that, described speaker system further comprises at least one loud speaker and a frequency divider, and this frequency divider is electrically connected with 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 this a plurality of loud speakers respectively.
11. speaker system as claimed in claim 1 is characterized in that, described speaker system further comprises an audio signal source, is used to produce an audio electrical signal and is 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 |
| US12/387,089 US8068624B2 (en) | 2008-04-28 | 2009-04-28 | Thermoacoustic device |
| US12/387,100 US8199938B2 (en) | 2008-04-28 | 2009-04-28 | Method of causing the thermoacoustic effect |
| US12/455,606 US8249279B2 (en) | 2008-04-28 | 2009-06-04 | Thermoacoustic device |
| US12/459,041 US8019099B2 (en) | 2008-04-28 | 2009-06-25 | Thermoacoustic device |
| US12/459,046 US8050430B2 (en) | 2008-04-28 | 2009-06-25 | Thermoacoustic device |
| US12/459,038 US8019097B2 (en) | 2008-04-28 | 2009-06-25 | Thermoacoustic device |
| US12/459,039 US8019098B2 (en) | 2008-04-28 | 2009-06-25 | Thermoacoustic device |
| US12/459,053 US8073165B2 (en) | 2008-04-28 | 2009-06-25 | Thermoacoustic device |
| US12/459,051 US8019100B2 (en) | 2008-04-28 | 2009-06-25 | Thermoacoustic device |
| US12/459,040 US8073163B2 (en) | 2008-04-28 | 2009-06-25 | Thermoacoustic device |
| US12/459,054 US8068625B2 (en) | 2008-04-28 | 2009-06-25 | Thermoacoustic device |
| US12/459,052 US8073164B2 (en) | 2008-04-28 | 2009-06-25 | Thermoacoustic device |
| US12/459,495 US8059841B2 (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 |
| US12/459,543 US8050431B2 (en) | 2008-04-28 | 2009-07-02 | Thermoacoustic device |
| US12/589,462 US8259967B2 (en) | 2008-04-28 | 2009-10-22 | Thermoacoustic device |
| US12/590,291 US8259968B2 (en) | 2008-04-28 | 2009-11-05 | Thermoacoustic device |
| US12/590,258 US8452031B2 (en) | 2008-04-28 | 2009-11-05 | Ultrasonic 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101820571A true CN101820571A (en) | 2010-09-01 |
| CN101820571B CN101820571B (en) | 2013-12-11 |
Family
ID=42655472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101058085A Active CN101820571B (en) | 2008-04-28 | 2009-02-27 | Speaker system |
Country Status (2)
| Country | Link |
|---|---|
| JP (2) | JP2010206785A (en) |
| CN (1) | CN101820571B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103841479A (en) * | 2012-11-20 | 2014-06-04 | 清华大学 | Earphone set |
| CN103841482A (en) * | 2012-11-20 | 2014-06-04 | 清华大学 | Earphone set |
| CN103841507B (en) * | 2012-11-20 | 2017-05-17 | 清华大学 | Preparation method for thermotropic sound-making device |
| CN103841506B (en) * | 2012-11-20 | 2017-09-01 | 清华大学 | The preparation method of thermophone array |
| CN112055295A (en) * | 2020-08-24 | 2020-12-08 | 清华大学 | Method and system for driving thermoacoustic device by using digitized real-time audio signal |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| KR102144867B1 (en) | 2016-06-10 | 2020-08-14 | 린텍 오브 아메리카, 인크. | Nanofiber sheet |
| JP7105234B2 (en) | 2017-02-24 | 2022-07-22 | リンテック・オヴ・アメリカ，インコーポレイテッド | Nanofiber thermal interface materials |
Family Cites Families (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61262305A (en) * | 1985-05-16 | 1986-11-20 | Pioneer Electronic Corp | Amplifier having noise rejection circuit |
| JPH03140100A (en) * | 1989-10-26 | 1991-06-14 | Fuji Xerox Co Ltd | Electroacoustic transducing method and apparatus therefor |
| JPH03175799A (en) * | 1989-12-04 | 1991-07-30 | Murata Mfg Co Ltd | Support jig for piezoelectric speaker |
| JPH07138838A (en) * | 1993-11-17 | 1995-05-30 | Nec Corp | Woven fabric and sheet produced by using carbon nano-tube |
| GB2314474B (en) * | 1996-06-21 | 2001-03-07 | Univ Bristol | Low power audio device |
| AUPP976499A0 (en) * | 1999-04-16 | 1999-05-06 | Commonwealth Scientific And Industrial Research Organisation | Multilayer carbon nanotube films |
| JP2002186097A (en) * | 2000-12-15 | 2002-06-28 | Pioneer Electronic Corp | Speaker |
| JP2003319490A (en) * | 2002-04-19 | 2003-11-07 | Sony Corp | Diaphragm and manufacturing method thereof, and speaker |
| CN100411979C (en) * | 2002-09-16 | 2008-08-20 | 清华大学 | Carbon nano pipe rpoe and preparation method thereof |
| JP4269867B2 (en) * | 2002-09-30 | 2009-05-27 | パナソニック電工株式会社 | lighting equipment |
| JP2006147801A (en) * | 2004-11-18 | 2006-06-08 | Seiko Precision Inc | Heat dissipating sheet, interface, electronic parts, and manufacturing method of heat dissipating sheet |
| CN1821048B (en) * | 2005-02-18 | 2014-01-15 | 中国科学院理化技术研究所 | Micro/nano thermoacoustic vibration exciter based on thermoacoustic conversion |
| JP4931389B2 (en) * | 2005-09-12 | 2012-05-16 | 株式会社山武 | Pressure wave generator and driving method of pressure wave generator |
| JP5221864B2 (en) * | 2005-10-26 | 2013-06-26 | パナソニック株式会社 | Pressure wave generator and manufacturing method thereof |
| JP4687446B2 (en) * | 2005-12-22 | 2011-05-25 | パナソニック電工株式会社 | Data transmission device |
| JP4817296B2 (en) * | 2006-01-06 | 2011-11-16 | 独立行政法人産業技術総合研究所 | Aligned carbon nanotube bulk aggregate and method for producing the same |
| KR100749886B1 (en) * | 2006-02-03 | 2007-08-21 | (주) 나노텍 | Heating element using Carbon Nano tube |
| JP2007290908A (en) * | 2006-04-25 | 2007-11-08 | National Institute For Materials Science | Long-length fiber formed of nanotube simple substance, and method and device for producing the same |
| CN101497436B (en) * | 2008-02-01 | 2015-06-03 | 清华大学 | Carbon nano-tube thin-film structure and preparation method thereof |
| CN101591015B (en) * | 2008-05-28 | 2013-02-13 | 清华大学 | Preparation method of banded carbon nano tube film |
-
2009
- 2009-02-27 CN CN2009101058085A patent/CN101820571B/en active Active
-
2010
- 2010-02-01 JP JP2010020346A patent/JP2010206785A/en active Pending
-
2013
- 2013-02-22 JP JP2013033226A patent/JP5685612B2/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103841479A (en) * | 2012-11-20 | 2014-06-04 | 清华大学 | Earphone set |
| CN103841482A (en) * | 2012-11-20 | 2014-06-04 | 清华大学 | Earphone set |
| CN103841482B (en) * | 2012-11-20 | 2017-01-25 | 清华大学 | Earphone set |
| CN103841507B (en) * | 2012-11-20 | 2017-05-17 | 清华大学 | Preparation method for thermotropic sound-making device |
| CN103841506B (en) * | 2012-11-20 | 2017-09-01 | 清华大学 | The preparation method of thermophone array |
| US9756442B2 (en) | 2012-11-20 | 2017-09-05 | Tsinghua University | Method for making thermoacoustic device array |
| US9774971B2 (en) | 2012-11-20 | 2017-09-26 | Tsinghua University | Method for making thermoacoustic device |
| US10009702B2 (en) | 2012-11-20 | 2018-06-26 | Tsinghua University | Method for making thermoacoustic device array |
| CN112055295A (en) * | 2020-08-24 | 2020-12-08 | 清华大学 | Method and system for driving thermoacoustic device by using digitized real-time audio signal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101820571B (en) | 2013-12-11 |
| JP2013128323A (en) | 2013-06-27 |
| JP2010206785A (en) | 2010-09-16 |
| JP5685612B2 (en) | 2015-03-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101715155B (en) | Earphone | |
| CN101820571B (en) | Speaker system | |
| CN101715160B (en) | Flexible sound producing device and sound producing flag | |
| US8019097B2 (en) | Thermoacoustic device | |
| US8208675B2 (en) | Loudspeaker | |
| CN101594563B (en) | Sound generating device | |
| JP5107964B2 (en) | Thermoacoustic device | |
| CN101820572B (en) | Thermoacoustic device | |
| CN101600141B (en) | Sound production device | |
| JP5107965B2 (en) | Thermoacoustic device | |
| JP5356992B2 (en) | Thermoacoustic device | |
| JP5107969B2 (en) | Thermoacoustic device | |
| CN101610444B (en) | Sounding device | |
| JP5270466B2 (en) | Thermoacoustic device | |
| JP5107968B2 (en) | Thermoacoustic device | |
| TWI397324B (en) | Loudspeaker system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |