CN101600139A - sound-producing device - Google Patents
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- CN101600139A CN101600139A CN 200810067586 CN200810067586A CN101600139A CN 101600139 A CN101600139 A CN 101600139A CN 200810067586 CN200810067586 CN 200810067586 CN 200810067586 A CN200810067586 A CN 200810067586A CN 101600139 A CN101600139 A CN 101600139A
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Abstract
The present invention relates to a kind of sound-producing device, it comprises: a signal input apparatus; And a sounding component, this sounding component is electrically connected with the two ends of described signal input apparatus; Wherein, described sounding component is a carbon nano-tube film, this carbon nano-tube film comprises the carbon nano-tube of a plurality of mutual windings, and described signal input apparatus input electrical signal is given this carbon nano-tube film, makes this carbon nano-tube film circumference gas medium send sound wave.But described sound-producing device can be used in the device of sounding such as earphone, audio amplifier, broadcast receiver.
Description
Technical field
The present invention relates to a kind of sound-producing device, relate in particular to a kind of sound-producing device based on carbon nano-tube.
Background technology
Sound-producing device generally is made up of signal input apparatus and sounding component.Give sounding component by the signal input apparatus input electrical signal, and then sound.Sounding component of the prior art is generally a loud speaker.This loud speaker is a kind of electro-acoustic element that electrical signal conversion is become voice signal.Particularly, can to change the audio-frequency electric power signal in the certain limit into distortion by the transducing mode little and have a sub-audible sound of enough sound pressure levels for loud speaker.
The kind of existing loud speaker is a lot, according to its operation principle, is divided into: dynamic speaker, electromagnetic loudspeaker, 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.
See also Fig. 1, existing dynamic speaker 100 is made up of three parts usually: voice coil loudspeaker voice coil 102, magnet 104 and vibrating diaphragm 106.Voice coil loudspeaker voice coil 102 adopts electrical conductor usually, and when importing a tone currents signal in the voice coil loudspeaker voice coil 102, voice coil loudspeaker voice coil 102 is equivalent to a current.Owing to be placed in the magnetic field that described magnet 104 produces, in magnetic field, can be subjected to Lorentz force according to current, the power that voice coil loudspeaker voice coil 102 can be subjected to that a size is directly proportional with tone currents, direction changes with the direction of tone currents.Therefore, voice coil loudspeaker voice coil 102 will vibrate under the action of a magnetic field that described magnet 104 produces in generation, and drives vibrating diaphragm 106 vibrations, and the air of vibrating diaphragm 106 front and back is vibration thereupon also, converts the electrical signal to sound wave to radiation all around.Yet the structure of this dynamic speaker 100 is comparatively complicated, and it must be worked having under the condition of magnetic.
Since the early 1990s, (see also Helical microtubules of graphiticcarbon, 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.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.
Therefore, necessaryly provide a kind of sound-producing device, this sound-producing device is simple in structure, can work under the condition of no magnetic.
Summary of the invention
A kind of sound-producing device, it comprises: a signal input apparatus; And a sounding component, this sounding component is electrically connected with the two ends of described signal input apparatus; Wherein, described sounding component is a carbon nano-tube film, this carbon nano-tube film comprises the carbon nano-tube of a plurality of mutual windings, and described signal input apparatus input electrical signal is given this carbon nano-tube film, makes this carbon nano-tube film circumference gas medium send sound wave.
Compared with prior art, described sound-producing device has the following advantages: one because the sounding component in the described sound-producing device only comprises carbon nano-tube film, need not other labyrinths such as magnet, so the structure of this sound-producing device is comparatively simple, help reducing the cost of this sound-producing device.Its two, this sound-producing device utilizes input signal to cause this sounding component variations in temperature, thereby its surrounding gas medium is expanded rapidly and shrinks, and then sends sound wave, need not vibrating diaphragm, and the sound-producing device that this sounding component is formed can be worked under the condition of no magnetic.They are three years old, because carbon nano-tube film has less thermal capacitance and big specific area, and the carbon nano-tube in the carbon nano-tube film is twined mutually, evenly distribute, behind input signal, variation according to signal strength signal intensity (as current strength), the sounding component of being made up of one deck carbon nano-tube film at least is the gas medium of circumference equably, heating and cooling rapidly, 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 is better.In addition, when described sounding component thickness is smaller, for example less than 10 microns, this sounding component has higher transparency, so formed sound-producing device is transparent sound-producing device, the surface that can be directly installed on the display surface of various display unit, mobile phone display screen or oil painting etc. is as the transparent sound-producing device of saving the space.They are four years old, because carbon nano-tube has mechanical strength and toughness preferably, so the carbon nano-tube film of being made up of the carbon nano-tube of mutual winding has preferably mechanical strength and toughness, durability is better and have self-supporting effect preferably, thereby help preparing the different shape of forming by carbon nano-tube film, the sound-producing device of size, and then be conveniently used in various fields.
Description of drawings
Fig. 1 is the structural representation of loud speaker in the prior art.
Fig. 2 is the structural representation of the technical program first embodiment sound-producing device.
Fig. 3 is the stereoscan photograph of carbon nano-tube film in the technical program first embodiment sound-producing device.
Fig. 4 is the structural representation of the technical program second embodiment sound-producing device.
Embodiment
Describe the sound-producing device of the technical program embodiment in detail below with reference to accompanying drawing.
See also Fig. 2, the technical program first embodiment provides a kind of sound-producing device 10, and this sound-producing device 10 comprises signal input apparatus 12, one sounding components, 14, one first electrodes 142 and one second electrode 144.Described first electrode 142 and second electrode 144 are provided with at interval, and are electrically connected with described signal input apparatus 12.Described first electrode 142 and second electrode 144 can play the effect of supporting described sounding component 14.In addition, described first electrode 142 and second electrode 144 are electrically connected with the two ends of described signal input apparatus 12 by external wire 149, are used for the signal of described signal input apparatus 12 is input in the described sounding component 14.
Described sounding component 14 comprises a carbon nano-tube film.This carbon nano-tube film is one to have the carbon nano-tube film of self supporting structure.This carbon nano-tube film comprises the carbon nano-tube of a plurality of mutual windings, and its stereoscan photograph sees also Fig. 3.In the described carbon nano-tube film, carbon nano-tube is an isotropism, evenly distributes random arrangement.The length of described carbon nano-tube is greater than 10 microns.Attract each other, twine by Van der Waals force between the described carbon nano-tube, form network-like structure, and then form a large amount of micropores.The aperture of this micropore is less than 10 microns.The existence of a large amount of micropores can guarantee that described sounding component 14 has bigger specific area.Described carbon nano-tube can be 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 length and the width of described carbon nano-tube film are not limit, and can prepare according to the actual requirements.The thickness of described carbon nano-tube film is 0.5 nanometer～1 millimeter.Among the technical program embodiment, the length of described carbon nano-tube film is 3 centimetres, and width is 3 centimetres, and thickness is 50 nanometers.In addition, because carbon nano-tube twines mutually, therefore described carbon nano-tube film has good toughness, can bending fold becomes arbitrary shape and does not break.Carbon nano-tube film among the technical program embodiment is a planar structure.When the thickness of the sounding component of being made up of this carbon nano-tube film 14 is smaller, for example less than 10 microns, this sounding component 14 has higher transparency, so adopting the sound-producing device 10 of this sounding component 14 be transparent sound-producing device 10, can be directly installed on the transparent sound-producing device 10 of the surface of the display surface of various display unit, mobile phone display screen or oil painting as the saving space.
Described first electrode 142 and second electrode 144 are formed by electric conducting material, and its concrete shape and structure is not limit.Particularly, described first electrode 142 and second electrode 144 may be selected to be stratiform, bar-shaped, block or other shape.The material of described first electrode 142 and second electrode 144 may be selected to be metal, conducting resinl, metallic carbon nanotubes, indium tin oxide (ITO) etc.Described first electrode 142 and second electrode 144 are used to realize being electrically connected between described signal input apparatus 12 and the described sounding component 14.Further, described first electrode 142 and second electrode 144 can play the effect of supporting described sounding component 14.Described sounding component 14 is electrically connected with described first electrode 142 and second electrode 144 respectively, and fixing by described first electrode 142 and second electrode 144.Because described sounding component 14 is a self-supporting, described first electrode 142 and second electrode 144 also space set are fixed on described sounding component 14 two ends or surface.Among the technical program embodiment, described first electrode 142 and second electrode 144 are bar-shaped metal electrode, and described first electrode 142 and second electrode 144 are provided with at interval and are fixed on described sounding component 14 two ends.Because described first electrode 142 and second electrode 144 are provided with at interval, can insert certain resistance when described sounding component 14 is applied to sound-producing device 10 and avoid short circuit phenomenon to produce.Because carbon nano-tube has great specific area, under the effect of Van der Waals force, this carbon nano-tube film itself has good adhesiveness, so when adopting this one deck carbon nano-tube film being made sounding component 14 at least, can directly be adhered fixed between described first electrode 142 and second electrode 144 and the described sounding component 14, and formation well electrically contacts.
Further, can further include a conduction tack coat (figure does not show) between described first electrode 142 and second electrode 144 and the described sounding component 14.Described conduction tack coat can be arranged at the surface of described sounding component 14.Described conduction tack coat can also make described first electrode 142 and second electrode 144 and described sounding component 14 fixing better when realizing that first electrode 142 and second electrode 144 electrically contact with described sounding component 14.In the present embodiment, described conduction tack coat is one deck elargol.
Be appreciated that when described sounding component has the self-supporting performance described first electrode 142 and second electrode 144 are selectable structure.Described signal input apparatus 12 can directly be electrically connected with described sounding component 14 by modes such as lead or contact conductors.In addition, any mode that realizes being electrically connected between described signal input apparatus 12 and the described sounding component 14 is all within the protection range of the technical program.
When described sounding component was self supporting structure, described first electrode, 142 to second electrodes 144 were selectable structure.Any mode that realizes being electrically connected between described signal input apparatus 12 and the described sounding component 14 is all within the protection range of the technical program.
The signal of described signal input apparatus 12 inputs comprises ac signal or audio electrical signal etc.Described signal input apparatus 12 is electrically connected with described first electrode 142 and second electrode 144 by lead 149, and by described first electrode 142 and second electrode 144 signal is input in the described sounding component 14.
Above-mentioned sound-producing device 10 in use, because carbon nano-tube film has less thermal capacitance and big specific area, and the carbon nano-tube in the carbon nano-tube film is twined mutually, evenly distribute, behind input signal, variation according to signal strength signal intensity (as current strength), the sounding component of being made up of one deck carbon nano-tube film at least 14 is the gas medium of circumference equably, heating and cooling rapidly, 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.It (is 1Hz～100kHz) that the audible frequency scope of the sound-producing device 10 that the technical program embodiment provides is 1 hertz to 100,000 hertz.So among the technical program embodiment, the sounding principle of described sounding component 14 is the conversion of " electricity-Re-sound ", is with a wide range of applications.In addition, because the carbon nano-tube film among the technical program embodiment is made up of the carbon nano-tube of a plurality of mutual windings, so this carbon nano-tube film has toughness and mechanical strength preferably, described carbon nano-tube film can be made the sound-producing device of different shape and size easily, but this sound-producing device can be conveniently used in the device of various sounding, in electronic applications such as sound equipment, mobile phone, MP3, MP4, TV, computer and other sound-producing device.
See also Fig. 4, the technical program second embodiment provides a kind of sound-producing device 20, and this sound-producing device 20 comprises a signal input apparatus 22, a sounding component 24, one first electrode 242, one second electrode 244, a third electrode 246 and one the 4th electrode 248.
The sound-producing device 20 among the technical program second embodiment and the structure of the sound-producing device 10 among first embodiment are basic identical, difference is, sound-producing device 20 among the technical program second embodiment comprises four electrodes, i.e. first electrode 242, second electrode 244, third electrode 246 and the 4th electrode 248.Described first electrode 242, second electrode 244, third electrode 246 and the 4th electrode 248 are bar-shaped metal electrode, and space parallel is provided with at interval.Described sounding component 24 is provided with and is electrically connected respectively with described first electrode 242, second electrode 244, third electrode 246 and the 4th electrode 248 around described first electrode 242, second electrode 244, third electrode 246 and the 4th electrode 248, forms an annular sounding component 24.Any two adjacent electrodes are electrically connected with the two ends of described signal input apparatus 22 respectively, so that the sounding component 24 between adjacent electrode inserts input signal.Particularly, earlier non-conterminous two electrodes are connected the back with lead 249 and be electrically connected with an end of described signal input apparatus 22, two remaining electrodes connect the back with lead 249 and are electrically connected with the other end of described signal input apparatus 22.Among the technical program embodiment, can earlier described first electrode 242 be connected the back with third electrode 246 usefulness leads 249 and be electrically connected, more described second electrode 244 is connected the back with the 4th electrode 248 usefulness leads 249 and be electrically connected with the other end of described signal input apparatus 22 with an end of described signal input apparatus 22.Above-mentioned connected mode can realize the parallel connection of the sounding component 24 between the adjacent electrode.Sounding component 24 after the parallel connection has less resistance, can reduce operating voltage.And above-mentioned connected mode can make described sounding component 24 have bigger swept area, and intensity of phonation is enhanced, and can realize around sounding effect.In addition, when the area of described sounding component 24 was big, described third electrode 246 and the 4th electrode 248 also can further play the effect of supporting described sounding component 24.
Be appreciated that described first electrode 242, second electrode 244, third electrode 246 and the 4th electrode 248 also can be arranged in the same plane with described sounding component 24.The connected mode of described connected mode that is arranged on each electrode in the same plane and above-mentioned electrode is same or similar.
Be appreciated that the technical program can be provided with a plurality of electrodes, its quantity is not limit, and only need guarantee that any two adjacent electrodes are electrically connected with the two ends of described signal input apparatus 22 respectively to get final product.
Compared with prior art, the sound-producing device that the technical program embodiment provides has the following advantages: one, because the sounding component in the described sound-producing device only comprises carbon nano-tube film, need not other labyrinths such as magnet, so the structure of this sound-producing device is comparatively simple, help reducing the cost of this sound-producing device.Its two, this sound-producing device utilizes input signal to cause this sounding component variations in temperature, thereby its surrounding gas medium is expanded rapidly and shrinks, and then sends sound wave, need not vibrating diaphragm, and so the sound-producing device that this sounding component is formed can under the condition of no magnetic, work.They are three years old, because carbon nano-tube film has less thermal capacitance and big specific area, and the carbon nano-tube in the carbon nano-tube film is twined mutually, evenly distribute, behind input signal, variation according to signal strength signal intensity (as current strength), the sounding component of being made up of one deck carbon nano-tube film at least is the gas medium of circumference equably, heating and cooling rapidly, 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 is better.In addition, when this sounding component thickness is smaller, for example less than 10 microns, this sounding component has higher transparency, so formed sound-producing device is transparent sound-producing device, the surface that can be directly installed on the display surface of various display unit, mobile phone display screen or oil painting etc. is as the transparent sound-producing device of saving the space.They are four years old, because carbon nano-tube has mechanical strength and toughness preferably, so the carbon nano-tube film of being made up of the carbon nano-tube of mutual winding has mechanical strength and toughness preferably, durability is better and the self-supporting effect is better, thereby help preparing the different shape of forming by carbon nano-tube film, the sound-producing device of size, and then be conveniently used in various fields.
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 (13)
1. sound-producing device, it comprises:
One signal input apparatus; And
One sounding component, this sounding component is electrically connected with the two ends of described signal input apparatus;
It is characterized in that, described sounding component is a carbon nano-tube film, this carbon nano-tube film comprises the carbon nano-tube of a plurality of mutual windings, and described signal input apparatus input electrical signal is given this carbon nano-tube film, makes this carbon nano-tube film circumference gas medium send sound wave.
2. sound-producing device as claimed in claim 1 is characterized in that, attracts each other, twines by Van der Waals force between the carbon nano-tube in the described carbon nano-tube film, forms network-like structure.
3. sound-producing device as claimed in claim 1 is characterized in that, the carbon nano-tube isotropism in the described carbon nano-tube film evenly distributes random arrangement.
4. sound-producing device as claimed in claim 1 is characterized in that, described carbon nano-tube film comprises that the aperture is less than 10 microns microcellular structure.
5. sound-producing device as claimed in claim 1 is characterized in that, the thickness of described carbon nano-tube film is 0.5 nanometer～1 millimeter.
6. sound-producing device as claimed in claim 1, it is characterized in that, carbon nano-tube in the described carbon nano-tube film is 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, 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.
7. sound-producing device as claimed in claim 1 is characterized in that described sound-producing device further comprises at least two electrodes, this at least two electrode gap setting and be electrically connected with described sounding component.
8. sound-producing device as claimed in claim 7 is characterized in that, described at least two electrodes further are electrically connected with the two ends of described signal input apparatus by lead.
9. sound-producing device as claimed in claim 7 is characterized in that, described at least two electrodes are stratiform, bar-shaped or block.
10. sound-producing device as claimed in claim 7 is characterized in that, the material of described electrode is metal, conducting resinl, metallic carbon nanotubes or indium tin oxide.
11. sound-producing device as claimed in claim 7 is characterized in that, described sound-producing device comprises that further a conduction tack coat is arranged between described two electrodes and the sounding component at least.
12. sound-producing device as claimed in claim 1, it is characterized in that, described sound-producing device comprises a plurality of electrodes, this a plurality of electrode gap settings and all being electrically connected with described sounding component, and any two adjacent electrodes are electrically connected with the two ends of described signal input apparatus respectively in these a plurality of electrodes.
13. sound-producing device as claimed in claim 1 is characterized in that, the signal of described signal input apparatus input comprises ac signal or audio electrical signal.
Priority Applications (24)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810067586 CN101600139B (en) | 2008-06-04 | 2008-06-04 | Sound producing device |
| KR1020090036004A KR101217913B1 (en) | 2008-04-28 | 2009-04-24 | Sound Emitting Device |
| EP09158698.2A EP2114088B1 (en) | 2008-04-28 | 2009-04-24 | Sound producing device |
| 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 |
| JP2009135409A JP5107965B2 (en) | 2008-06-04 | 2009-06-04 | Thermoacoustic device |
| US12/459,054 US8068625B2 (en) | 2008-04-28 | 2009-06-25 | Thermoacoustic device |
| US12/459,039 US8019098B2 (en) | 2008-04-28 | 2009-06-25 | Thermoacoustic device |
| US12/459,038 US8019097B2 (en) | 2008-04-28 | 2009-06-25 | 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 |
| US12/459,051 US8019100B2 (en) | 2008-04-28 | 2009-06-25 | Thermoacoustic device |
| US12/459,040 US8073163B2 (en) | 2008-04-28 | 2009-06-25 | Thermoacoustic device |
| US12/459,053 US8073165B2 (en) | 2008-04-28 | 2009-06-25 | Thermoacoustic device |
| US12/459,052 US8073164B2 (en) | 2008-04-28 | 2009-06-25 | 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 |
| US12/459,495 US8059841B2 (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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810067586 CN101600139B (en) | 2008-06-04 | 2008-06-04 | Sound producing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101600139A true CN101600139A (en) | 2009-12-09 |
| CN101600139B CN101600139B (en) | 2013-02-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200810067586 Active CN101600139B (en) | 2008-04-28 | 2008-06-04 | Sound producing device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5107965B2 (en) |
| CN (1) | CN101600139B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102189073A (en) * | 2010-03-10 | 2011-09-21 | 鸿富锦精密工业（深圳）有限公司 | Ultrasonic wave generator |
| CN106131761A (en) * | 2010-05-10 | 2016-11-16 | 北京富纳特创新科技有限公司 | Thermo-acoustic device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101610443B (en) * | 2008-06-18 | 2013-02-13 | 清华大学 | Audible device |
| CN101713531B (en) | 2008-10-08 | 2013-08-28 | 清华大学 | Sounding type lighting device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003319490A (en) * | 2002-04-19 | 2003-11-07 | Sony Corp | Diaphragm and manufacturing method thereof, and speaker |
| JP2005189322A (en) * | 2003-12-24 | 2005-07-14 | Sharp Corp | Image forming apparatus |
| JP2005333601A (en) * | 2004-05-20 | 2005-12-02 | Norimoto Sato | Negative feedback amplifier driving loudspeaker unit |
| KR101010228B1 (en) * | 2005-10-26 | 2011-01-21 | 파나소닉 전공 주식회사 | Pressure wave generator and production method therefor |
| CN101594563B (en) * | 2008-04-28 | 2013-10-09 | 北京富纳特创新科技有限公司 | Sound generating device |
-
2008
- 2008-06-04 CN CN 200810067586 patent/CN101600139B/en active Active
-
2009
- 2009-06-04 JP JP2009135409A patent/JP5107965B2/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102189073A (en) * | 2010-03-10 | 2011-09-21 | 鸿富锦精密工业（深圳）有限公司 | Ultrasonic wave generator |
| CN106131761A (en) * | 2010-05-10 | 2016-11-16 | 北京富纳特创新科技有限公司 | Thermo-acoustic device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2009296592A (en) | 2009-12-17 |
| JP5107965B2 (en) | 2012-12-26 |
| CN101600139B (en) | 2013-02-13 |
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