CN105228067A - Pronunciation device and earphone - Google Patents
Pronunciation device and earphone Download PDFInfo
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- CN105228067A CN105228067A CN201510645993.2A CN201510645993A CN105228067A CN 105228067 A CN105228067 A CN 105228067A CN 201510645993 A CN201510645993 A CN 201510645993A CN 105228067 A CN105228067 A CN 105228067A
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- piezoelectric membrane
- airtight cavity
- sidewall
- sound
- pronunciation device
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Abstract
Present invention is disclosed a kind of pronunciation device and earphone, wherein pronunciation device comprises airtight cavity and piezoelectric membrane; The sidewall of described airtight cavity arranged sound hole, and all or part of sidewall of described airtight cavity is flexible sidewall, and described flexible sidewall is fixedly pasted with piezoelectric membrane; Described piezoelectric membrane receives driving voltage by electric installation and deformation occurs, and pull described flexible sidewall and shrink, expand the gas pulsation generation sound wave made in airtight cavity, sound wave conducts to airtight cavity outside by described sound hole of crossing.The quality of piezoelectric membrane is significantly smaller than coil in existing loudspeaker techniques and cone, splendid frequency response and sensitivity can be obtained, can use voltage driven, coil-moving speaker compared to existing technology uses current drives, greatly can improve the fidelity of broadcasting.
Description
Technical field
The present invention relates to sound generating apparatus, particularly relate to a kind of pronunciation device and earphone.
Background technology
Earphone is a pair converting unit, and it accepts the electric signal that media player or receiver send, and utilizes the loud speaker of ear to convert it into the sound wave that can hear.Earphone is generally separable with media player, utilizes a plug to connect.Benefit is when not affecting other people, can listen to sound equipment alone; Also the sound of surrounding environment can be separated, to helpful the people that uses under noisy environment of making an uproar in recording studio, DJ, journey, motion etc.
Earphone has the little advantage of distortion for loud speaker, but still there is distortion, how to reduce distortion, is one of direction always updated of earphone development.
Summary of the invention
Main purpose of the present invention is for providing a kind of pronunciation device and the earphone that can improve fidelity and sensitivity.
In order to realize foregoing invention object, first the present invention proposes a kind of pronunciation device, comprises airtight cavity and piezoelectric membrane;
The sidewall of described airtight cavity arranged sound hole, and all or part of sidewall of described airtight cavity is flexible sidewall, and described flexible sidewall is fixedly pasted with piezoelectric membrane;
Described piezoelectric membrane receives driving voltage by electric installation and deformation occurs, and pull described flexible sidewall and shrink, expand the gas pulsation generation sound wave made in airtight cavity, sound wave conducts to airtight cavity outside by described sound hole of crossing.
Further, described piezoelectric membrane is banded, and described airtight cavity is that one end is airtight, and the other end arranges the described flexible conduit crossing sound hole;
On the inwall that described piezoelectric membrane helically is attached at flexible conduit and/or outer wall.
Further, described pronunciation device also comprises Voltag driving circuit, and one end of described Voltag driving circuit connects the input of described piezoelectric membrane, and the other end connects described electric installation.
Further, the volume of described airtight cavity and the area ratio of piezoelectric membrane are at least less than 1.5.
Further, when described piezoelectric membrane is arranged at the outside of flexible sidewall, corresponding described piezoelectric membrane arranges protective device.
The present invention also provides a kind of earphone, comprises pronunciation device, sound guide tube and earplug;
Described pronunciation device, comprises airtight cavity and piezoelectric membrane, described airtight cavity sidewall on sound hole was set, all or part of sidewall of described airtight cavity is flexible sidewall, and described flexible sidewall is fixedly pasted with piezoelectric membrane;
One end of described sound guide tube is connected to airtight cavity, and this end port connects described sound hole excessively; The other end of described sound guide tube arranges described earplug;
Described piezoelectric membrane receives driving voltage by electric installation and deformation occurs, pull described flexible sidewall to shrink, expand and make the gas pulsation in airtight cavity produce sound wave, sound wave passed through sound hole and conducted to sound guide tube, and when people's ear filled in by earplug, sound wave is propagated in duct.
Further, described piezoelectric membrane is banded, and described airtight cavity is that one end is airtight, and the other end arranges the described flexible conduit crossing sound hole;
On the inwall that described piezoelectric membrane helically is attached at flexible conduit and/or outer wall.
Further, described pronunciation device also comprises Voltag driving circuit, and one end of described Voltag driving circuit connects the input of described piezoelectric membrane, and the other end connects described electric installation.
Further, the volume in described airtight cavity and the area ratio of piezoelectric membrane are at least less than 1.5.
Further, when described piezoelectric membrane is arranged at the outside of flexible sidewall, corresponding described piezoelectric membrane arranges protective device.
Pronunciation device of the present invention and earphone, piezoelectric membrane is arranged on the flexible sidewall of airtight cavity, airtight cavity arranged sound hole, when piezoelectric membrane receives driving voltage, piezoelectric membrane can produce corresponding deformation, mainly the surface area of piezoelectric membrane changes, thus the air pullled in flexible sidewall extruding airtight cavity produces corresponding vibrations and generates sound wave, because the quality of piezoelectric membrane is less than coil and the cone of prior art, and be that piezoelectric membrane self deformation occurs, so can subtract low-energy loss; Can use voltage driven, coil compared to existing technology and cone use current drives, exist without inductance, there will not be the situation of voltage after front current hysteresis to occur, improve fidelity and the sensitivity of sound wave, can also obtain extremely wide frequency response.
Accompanying drawing explanation
Fig. 1 is the structural representation of the pronunciation device of one embodiment of the invention;
Fig. 2 is the structural representation of the pronunciation device of the present invention one specific embodiment;
Fig. 3 is the structural representation of the earphone of another embodiment of the present invention.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
With reference to Fig. 1, a kind of pronunciation device is provided in the embodiment of the present invention, comprises airtight cavity 10 and piezoelectric membrane 20; The sidewall of described airtight cavity 10 arranged sound hole 11, and all or part of sidewall of described airtight cavity 10 is flexible sidewall, and described flexible sidewall is fixedly pasted with piezoelectric membrane 20; Described piezoelectric membrane 20 receives driving voltage by electric installation 30 and deformation occurs, and pull described flexible sidewall and shrink, expand the gas pulsation generation sound wave made in airtight cavity 10, sound wave conducts to airtight cavity 10 outside by described sound hole 11 of crossing.
Above-mentioned piezoelectric membrane 20 is generally piezoelectric polyvinylidene fluoride PVDF polymeric membrane, that one is subject to External force interference and after being out of shape, the film of corresponding electric signal can be produced, it is larger that same piezoelectric membrane 20 has deformation, the feature that the signal of telecommunication produced is larger, same, when outside piezoelectric membrane 20 input electrical signal, can there is deformation in piezoelectric membrane 20, namely variable area can change.
Above-mentioned closed cavity is the cavity that an inside is full of air, and this airtight cavity 10 communication channel unique with the external world is above-mentioned crosses sound hole 11, owing to crossing the existence of sound hole 11, makes the gas pressure intensity in airtight cavity 10 identical with extraneous gas pressure.
The pronunciation device of the present embodiment, the feature that deformation can occur after utilizing piezoelectric membrane 20 to receive the signal of telecommunication fully realizes.When the piezoelectric membrane 20 in airtight cavity 10 is connected with external drive circuit by electric installation 30, drive circuit is to piezoelectric membrane 20 input voltage, piezoelectric membrane 20 carries out deformation fast according to the size of receiver voltage, thus pull flexible sidewall compression airtight cavity 10 gas pulsation generation sound wave, sound wave can spread out of from crossing sound hole 11.Because the quality of piezoelectric membrane 20 is less than coil and the cone of prior art, and be that piezoelectric membrane 20 self deformation occurs, so can subtract low-energy loss; Can use voltage driven, moving-coil type vibrations compared to existing technology use current drives, exist without inductance, so there will not be the situation of voltage after front current hysteresis to occur, improve fidelity and the sensitivity of sound wave, can also obtain extremely wide frequency response.
In the present embodiment, in order to improve the voice effect of above-mentioned pronunciation device, the area of piezoelectric membrane 20 is the bigger the better with the ratio of the volume of closed cavity, because the area of piezoelectric membrane 20 is larger, the volume of airtight cavity 10 is less, when deformation occurs piezoelectric membrane 20, air pulsation in airtight cavity 10 is more obvious, sound intensity of wave can be larger, improves the voice effect of the pronunciation device of the present embodiment, reduce the driving requirement of drive circuit.In one embodiment, if the area of piezoelectric membrane 20 is very little, and the volume of airtight cavity 10 is very large, and deformation occurs piezoelectric membrane 20, although can produce vibrations and make to be formed around it sound wave, because airtight cavity 10 is too large, causes intensity of acoustic wave faint.
With reference to Fig. 2, in the present embodiment, above-mentioned piezoelectric membrane 20 is banded, and airtight cavity 10 is that one end is airtight, and the other end arranges the described flexible conduit crossing sound hole 11; Piezoelectric membrane 20 helically is attached on the inwall of flexible conduit, and in other embodiments, piezoelectric membrane 20 also can be attached at the outer wall of flexible conduit by helically, or helically is attached at the inner and outer wall of flexible conduit simultaneously.Helical form attaches can increase the area of piezoelectric membrane 20, can make the gas in flexible conduit compression by a larger margin or stretching flexible conduit, produce the sound that sound intensity is larger when deformation occurs piezoelectric membrane 20.In the present embodiment, the diameter of flexible conduit is thinner, and the length of flexible conduit is longer, and the sound quality of generation might as well.In the present embodiment, the general viscose glue that uses makes piezoelectric membrane 20 be attached on the sidewall of described flexible conduit.
In the present embodiment, above-mentioned pronunciation device also comprises Voltag driving circuit, be arranged at the inside of airtight cavity 10, one end of described Voltag driving circuit connects the input of described piezoelectric membrane 20, the other end connects described electric installation 30, and the direct input voltage of Voltag driving circuit, to piezoelectric membrane 20, occurs without inductance phenomenon, improve fidelity and the sensitivity of pronunciation device, make pronunciation device have extremely wide frequency response.In another embodiment, Voltag driving circuit arranges the outside of airtight cavity 10, and one end is connected with the input of piezoelectric membrane 20 through the sidewall of airtight cavity 10, and the other end is connected with electric installation 30, driving voltage is acted on piezoelectric membrane 20.
In the present embodiment, the volume in above-mentioned airtight cavity 10 and the area ratio of piezoelectric membrane 20 are at least 1.5, better can convert electrical signals to voice signal.
In the present embodiment, when piezoelectric membrane described above is arranged at the outside of flexible sidewall, corresponding described piezoelectric membrane arranges protective device.Such as, in one embodiment, above-mentioned piezoelectric membrane 20 is banded, and airtight cavity 10 is that one end is airtight, and the other end arranges the described flexible conduit crossing sound hole 11; Piezoelectric membrane 20 helically is attached on the outer wall of flexible conduit; and then the outside of flexible conduit is socketed another protection flexible pipe; namely piezoelectric membrane is fixed on flexible conduit by viscose glue is spiral helicine, then protects flexible pipe in the outside being enclosed within flexible conduit, protection piezoelectric membrane.
The pronunciation device of the present embodiment, in on flexible sidewall piezoelectric membrane 20 being arranged at airtight cavity 10, airtight cavity 10 arranged sound hole 11, when piezoelectric membrane 20 receives driving voltage, piezoelectric membrane 20 can produce corresponding deformation, mainly the surface area of piezoelectric membrane 20 changes, thus the air pullled in flexible sidewall extruding airtight cavity 10 produces corresponding vibrations and generates sound wave, because the quality of piezoelectric membrane 20 is less than the moving-coil type vibrations of prior art, and be that piezoelectric membrane 20 self deformation occurs, so can subtract low-energy loss; Can use voltage driven, coil compared to existing technology and cone use current drives, exist without inductance, there will not be the situation of voltage after front current hysteresis to occur, improve fidelity and the sensitivity of sound wave, can also obtain extremely wide frequency response.
With reference to Fig. 3, also provide a kind of earphone in the embodiment of the present invention, pronunciation device, sound guide tube 40 and earplug 50, wherein pronunciation device comprises airtight cavity 10 and piezoelectric membrane 20; The sidewall of described airtight cavity 10 arranged sound hole 11, and all or part of sidewall of described airtight cavity 10 is flexible sidewall, and described flexible sidewall is fixedly pasted with piezoelectric membrane 20; One end of described sound guide tube 40 is connected to airtight cavity 10, and this end port connects described sound hole 11 excessively; The other end of described sound guide tube 40 arranges described earplug 50; Described piezoelectric membrane 20 receives driving voltage by electric installation 30 and deformation occurs, pull described flexible sidewall to shrink, expand the gas pulsation generation sound wave made in airtight cavity 10, sound wave passed through sound hole 11 and conducted to sound guide tube 40, and when people's ear filled in by earplug 50, sound wave is propagated in duct.The earphone of the present embodiment, in use, after filling in people's ear by earplug 50, earplug 50 simple can close external auditory meatus, makes inner ear form an airtight transaudient passage, when after generation sound wave airtight cavity 10 in, the inner ear of people can be delivered to, produce obvious sonic stimulation at inner ear.
Above-mentioned piezoelectric membrane 20 is generally piezoelectric polyvinylidene fluoride PVDF polymeric membrane, that one is subject to External force interference and after being out of shape, the film of corresponding electric signal can be produced, it is larger that same piezoelectric membrane 20 has deformation, the feature that the signal of telecommunication produced is larger, same, when outside piezoelectric membrane 20 input electrical signal, can there is deformation in piezoelectric membrane 20, namely variable area can change.
Above-mentioned closed cavity is the cavity that an inside is full of air, and this airtight cavity 10 communication channel unique with the external world is above-mentioned crosses sound hole 11, owing to crossing the existence of sound hole 11, makes the gas pressure intensity in airtight cavity 10 identical with extraneous gas pressure.
The earphone of the present embodiment, the feature that deformation can occur after utilizing piezoelectric membrane 20 to receive the signal of telecommunication fully realizes.When the piezoelectric membrane 20 in airtight cavity 10 is connected with external drive circuit by electric installation 30, drive circuit is to piezoelectric membrane 20 input voltage, piezoelectric membrane 20 carries out deformation fast according to the size of receiver voltage, thus pull flexible sidewall compression airtight cavity 10 gas pulsation generation sound wave, sound wave can spread out of from crossing sound hole 11.Because the quality of piezoelectric membrane 20 is less than coil and the cone of prior art, and be that piezoelectric membrane 20 self deformation occurs, so can subtract low-energy loss; Can use voltage driven, moving-coil type vibrations compared to existing technology use current drives, exist without inductance, so there will not be the situation of voltage after front current hysteresis to occur, improve fidelity and the sensitivity of sound wave, can also obtain extremely wide frequency response.
In the present embodiment, in order to improve the voice effect of above-mentioned pronunciation device, the area of piezoelectric membrane 20 is the bigger the better with the ratio of the volume of closed cavity, because the area of piezoelectric membrane 20 is larger, the volume of airtight cavity 10 is less, when deformation occurs piezoelectric membrane 20, air pulsation in airtight cavity 10 is more obvious, sound intensity of wave can be larger, improves the voice effect of the pronunciation device of the present embodiment, reduce the driving requirement of drive circuit.In one embodiment, if the area of piezoelectric membrane 20 is very little, and the volume of airtight cavity 10 is very large, and deformation occurs piezoelectric membrane 20, although can produce vibrations and make to be formed around it sound wave, because airtight cavity 10 is too large, causes intensity of acoustic wave faint.
With reference to Fig. 2, in the present embodiment, above-mentioned piezoelectric membrane 20 is banded, and airtight cavity 10 is that one end is airtight, and the other end arranges the described flexible conduit crossing sound hole 11; Piezoelectric membrane 20 helically is attached on the inwall of flexible conduit, and in other embodiments, piezoelectric membrane 20 also can be attached at the outer wall of flexible conduit by helically, or helically is attached at the inner and outer wall of flexible conduit simultaneously.Helical form attaches can increase the area of piezoelectric membrane 20, can make the gas in flexible conduit compression by a larger margin or stretching flexible conduit, produce the sound that sound intensity is larger when deformation occurs piezoelectric membrane 20.In the present embodiment, the diameter of flexible conduit is thinner, and the length of flexible conduit is longer, and the sound quality of generation might as well.In the present embodiment, the general viscose glue that uses makes piezoelectric membrane 20 be attached on the sidewall of described flexible conduit.
In the present embodiment, above-mentioned pronunciation device also comprises Voltag driving circuit, be arranged at the inside of airtight cavity 10, one end of described Voltag driving circuit connects the input of described piezoelectric membrane 20, the other end connects described electric installation 30, and the direct input voltage of Voltag driving circuit, to piezoelectric membrane 20, occurs without inductance phenomenon, improve fidelity and the sensitivity of pronunciation device, make pronunciation device have extremely wide frequency response.In another embodiment, Voltag driving circuit arranges the outside of airtight cavity 10, and one end is connected with the input of piezoelectric membrane 20 through the sidewall of airtight cavity 10, and the other end is connected with electric installation 30, driving voltage is acted on piezoelectric membrane 20.
In the present embodiment, the volume in above-mentioned airtight cavity 10 and the area ratio of piezoelectric membrane 20 are at least 1.5, better can convert electrical signals to voice signal.
In the present embodiment, when piezoelectric membrane described above is arranged at the outside of flexible sidewall, corresponding described piezoelectric membrane arranges protective device.Such as, in one embodiment, above-mentioned piezoelectric membrane 20 is banded, and airtight cavity 10 is that one end is airtight, and the other end arranges the described flexible conduit crossing sound hole 11; Piezoelectric membrane 20 helically is attached on the outer wall of flexible conduit; and then the outside of flexible conduit is socketed another protection flexible pipe; namely piezoelectric membrane is fixed on flexible conduit by viscose glue is spiral helicine, then protects flexible pipe in the outside being enclosed within flexible conduit, protection piezoelectric membrane.
The earphone of the present embodiment, in on flexible sidewall piezoelectric membrane 20 being arranged at airtight cavity 10, airtight cavity 10 arranged sound hole 11, when piezoelectric membrane 20 receives driving voltage, piezoelectric membrane 20 can produce corresponding deformation, mainly the surface area of piezoelectric membrane 20 changes, thus the air pullled in flexible sidewall extruding airtight cavity 10 produces corresponding vibrations and generates sound wave, because the quality of piezoelectric membrane 20 is less than the moving-coil type vibrations of prior art, and be that piezoelectric membrane 20 self deformation occurs, so can subtract low-energy loss; Can use voltage driven, coil compared to existing technology and cone use current drives, exist without inductance, there will not be the situation of voltage after front current hysteresis to occur, improve fidelity and the sensitivity of sound wave, can also obtain extremely wide frequency response.
The foregoing is only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a pronunciation device, is characterized in that, comprises airtight cavity and piezoelectric membrane;
The sidewall of described airtight cavity arranged sound hole, and all or part of sidewall of described airtight cavity is flexible sidewall, and described flexible sidewall is fixedly pasted with piezoelectric membrane;
Described piezoelectric membrane receives driving voltage by electric installation and deformation occurs, and pull described flexible sidewall and shrink, expand the gas pulsation generation sound wave made in airtight cavity, sound wave conducts to airtight cavity outside by described sound hole of crossing.
2. pronunciation device according to claim 1, is characterized in that, described piezoelectric membrane is banded, and described airtight cavity is that one end is airtight, and the other end arranges the described flexible conduit crossing sound hole;
On the inwall that described piezoelectric membrane helically is attached at flexible conduit and/or outer wall.
3. pronunciation device according to claim 1, is characterized in that, also comprises Voltag driving circuit, and one end of described Voltag driving circuit connects the input of described piezoelectric membrane, and the other end connects described electric installation.
4. pronunciation device according to claim 1, is characterized in that, the volume of described airtight cavity and the area ratio of piezoelectric membrane are at least less than 1.5.
5. the pronunciation device according to any one of claim 1-4, is characterized in that, when described piezoelectric membrane is arranged at the outside of flexible sidewall, corresponding described piezoelectric membrane arranges protective device.
6. an earphone, is characterized in that, comprises pronunciation device, sound guide tube and earplug;
Described pronunciation device, comprises airtight cavity and piezoelectric membrane, described airtight cavity sidewall on sound hole was set, all or part of sidewall of described airtight cavity is flexible sidewall, and described flexible sidewall is fixedly pasted with piezoelectric membrane;
One end of described sound guide tube is connected to airtight cavity, and this end port connects described sound hole excessively; The other end of described sound guide tube arranges described earplug;
Described piezoelectric membrane receives driving voltage by electric installation and deformation occurs, pull described flexible sidewall to shrink, expand and make the gas pulsation in airtight cavity produce sound wave, sound wave passed through sound hole and conducted to sound guide tube, and when people's ear filled in by earplug, sound wave is propagated in duct.
7. earphone according to claim 6, is characterized in that, described piezoelectric membrane is banded, and described airtight cavity is that one end is airtight, and the other end arranges the described flexible conduit crossing sound hole;
On the inwall that described piezoelectric membrane helically is attached at flexible conduit and/or outer wall.
8. earphone according to claim 6, is characterized in that, also comprises Voltag driving circuit, and one end of described Voltag driving circuit connects the input of described piezoelectric membrane, and the other end connects described electric installation.
9. earphone according to claim 6, is characterized in that, the volume in described airtight cavity and the area ratio of piezoelectric membrane are at least less than 1.5.
10. the earphone according to any one of claim 6-9, is characterized in that, when described piezoelectric membrane is arranged at the outside of flexible sidewall, corresponding described piezoelectric membrane arranges protective device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510645993.2A CN105228067A (en) | 2015-09-30 | 2015-09-30 | Pronunciation device and earphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510645993.2A CN105228067A (en) | 2015-09-30 | 2015-09-30 | Pronunciation device and earphone |
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| CN105228067A true CN105228067A (en) | 2016-01-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510645993.2A Pending CN105228067A (en) | 2015-09-30 | 2015-09-30 | Pronunciation device and earphone |
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|---|---|---|---|---|
| US4843275A (en) * | 1988-01-19 | 1989-06-27 | Pennwalt Corporation | Air buoyant piezoelectric polymeric film microphone |
| CN1039517A (en) * | 1988-07-11 | 1990-02-07 | 法国石油研究院 | The piezoelectric transducer that comprises at least one pair of flexible sensitive elements of great length |
| WO2009063905A1 (en) * | 2007-11-12 | 2009-05-22 | Nec Corporation | Piezoelectric acoustic device and electronic apparatus |
| JP2011228966A (en) * | 2010-04-21 | 2011-11-10 | Nec Corp | Electroacoustic transducer and electronic device thereof |
| CN102623627A (en) * | 2012-04-06 | 2012-08-01 | 天津大学 | Novel piezoelectric composite material |
| JP2014212552A (en) * | 2014-06-24 | 2014-11-13 | 国立大学法人九州工業大学 | Speaker |
| CN205336530U (en) * | 2015-09-30 | 2016-06-22 | 杨松 | Pronunciation device and earphone |
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2015
- 2015-09-30 CN CN201510645993.2A patent/CN105228067A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4843275A (en) * | 1988-01-19 | 1989-06-27 | Pennwalt Corporation | Air buoyant piezoelectric polymeric film microphone |
| CN1039517A (en) * | 1988-07-11 | 1990-02-07 | 法国石油研究院 | The piezoelectric transducer that comprises at least one pair of flexible sensitive elements of great length |
| WO2009063905A1 (en) * | 2007-11-12 | 2009-05-22 | Nec Corporation | Piezoelectric acoustic device and electronic apparatus |
| JP2011228966A (en) * | 2010-04-21 | 2011-11-10 | Nec Corp | Electroacoustic transducer and electronic device thereof |
| CN102623627A (en) * | 2012-04-06 | 2012-08-01 | 天津大学 | Novel piezoelectric composite material |
| JP2014212552A (en) * | 2014-06-24 | 2014-11-13 | 国立大学法人九州工業大学 | Speaker |
| CN205336530U (en) * | 2015-09-30 | 2016-06-22 | 杨松 | Pronunciation device and earphone |
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Application publication date: 20160106 |
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