CN105228066A - Piezoelectric membrane pronunciation device and earphone - Google Patents
Piezoelectric membrane pronunciation device and earphone Download PDFInfo
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- CN105228066A CN105228066A CN201510645991.3A CN201510645991A CN105228066A CN 105228066 A CN105228066 A CN 105228066A CN 201510645991 A CN201510645991 A CN 201510645991A CN 105228066 A CN105228066 A CN 105228066A
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Abstract
Present invention is disclosed a kind of piezoelectric membrane pronunciation device and earphone, wherein earphone comprises piezoelectric membrane pronunciation device, sound guide tube and earplug; Described piezoelectric membrane pronunciation device, comprises airtight cavity, and partial sidewall or whole sidewall of described airtight cavity are piezoelectric membrane, and described airtight cavity arranged sound hole; 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; When piezoelectric membrane receives driving voltage, piezoelectric membrane generation deformation makes the gas pulsation in airtight cavity produce sound wave, and sound wave is passed to sound guide tube along described sound hole of crossing, and when people's ear filled in by earplug, sound wave is propagated in duct.Piezoelectric membrane pronunciation device of the present invention and earphone, can obtain splendid frequency response and sensitivity, can use voltage driven, and 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 piezoelectric membrane 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 piezoelectric membrane pronunciation device, comprises airtight cavity;
Partial sidewall or whole sidewall of described airtight cavity are piezoelectric membrane, and described airtight cavity arranged sound hole;
When piezoelectric membrane receives driving voltage, piezoelectric membrane generation deformation makes the gas pulsation in airtight cavity produce sound wave, and sound wave crosses along described the outside that sound hole is passed to airtight cavity.
Further, described piezoelectric membrane pronunciation device also comprises protective layer, and this this protective layer is arranged at the outside of piezoelectric membrane, and and has gap between piezoelectric membrane.
Further, described airtight cavity is column, and the sidewall of column is piezoelectric membrane composition, and two ends arrange airtight cover plate, wherein an airtight cover plate is arranged described sound hole excessively;
Described column is cylinder; Or the side of the cross section of column is bending ring-type repeatedly; Or the side of the longitudinal section of column is bending ring-type repeatedly.
Further, the volume in described airtight cavity and the area ratio of piezoelectric membrane are at least less than 1.5.
Further, described piezoelectric membrane pronunciation device also comprises Voltag driving circuit, and described Voltag driving circuit is connected with the input of described piezoelectric membrane; The inside that described Voltag driving circuit is arranged at airtight cavity is run through described airtight cavity by an electric installation and is connected with external power source, or the outside being arranged at airtight cavity is connected with power supply.
The present invention also provides a kind of earphone, comprises piezoelectric membrane pronunciation device, sound guide tube and earplug;
Described piezoelectric membrane pronunciation device, comprises airtight cavity, and partial sidewall or whole sidewall of described airtight cavity are piezoelectric membrane, and described airtight cavity arranged sound hole;
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;
When piezoelectric membrane receives driving voltage, piezoelectric membrane generation deformation makes the gas pulsation in airtight cavity produce sound wave, and sound wave is passed to sound guide tube along described sound hole of crossing, and when people's ear filled in by earplug, sound wave is propagated in duct.
Further, described piezoelectric membrane pronunciation device also comprises protective layer, and this protective layer is arranged at the outside of piezoelectric membrane, and and has gap between piezoelectric membrane.
Further, described airtight cavity is column, and the sidewall of column is piezoelectric membrane composition, and two ends arrange airtight cover plate, wherein an airtight cover plate is arranged described sound hole excessively;
Described column is cylinder; Or the side of the cross section of column is bending ring-type repeatedly; Or the side of the longitudinal section of column is bending ring-type repeatedly.
Further, the volume in described airtight cavity and the area ratio of piezoelectric membrane are at least less than 1.5.
Further, described earphone also comprises Voltag driving circuit, and described Voltag driving circuit is connected with the input of described piezoelectric membrane; The inside that described Voltag driving circuit is arranged at airtight cavity is run through described airtight cavity by an electric installation and is connected with external power source, or the outside being arranged at airtight cavity is connected with power supply.
The piezoelectric membrane pronunciation device that the present invention proposes and earphone, piezoelectric membrane is set to the partial sidewall of airtight cavity or whole sidewall, when piezoelectric membrane receives driving voltage, piezoelectric membrane can produce corresponding deformation, mainly the surface area of piezoelectric membrane changes, thus the air in 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 cross section structure schematic diagram of the piezoelectric membrane pronunciation device of one embodiment of the invention;
Fig. 2 is the cross section structure schematic diagram of the piezoelectric membrane pronunciation device of another embodiment of the present invention;
Fig. 3 is the structural representation of the piezoelectric membrane pronunciation device of the present invention one specific embodiment;
Fig. 4 is the cross section structure schematic diagram of the piezoelectric membrane pronunciation device of another specific embodiment of the present invention;
Fig. 5 is the cross section structure schematic diagram of the piezoelectric membrane pronunciation device of the another specific embodiment of the present invention;
Fig. 6 is the structural representation of the earphone of one embodiment of the 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, the embodiment of the present invention provides a kind of piezoelectric membrane pronunciation device, comprises airtight cavity 10; Partial sidewall or whole sidewall of described airtight cavity 10 are piezoelectric membrane 12, and described airtight cavity 10 arranged sound hole 11; When piezoelectric membrane 12 receives driving voltage, deformation occurs piezoelectric membrane 12 makes the gas pulsation in airtight cavity 10 produce sound wave, and sound wave crosses along described the outside that sound hole 11 is passed to airtight cavity 10.
Above-mentioned piezoelectric membrane 12 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 12 has deformation, the feature that the signal of telecommunication produced is larger, same, when outside piezoelectric membrane 12 input electrical signal, can there is deformation in piezoelectric membrane 12, 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 partial sidewall of above-mentioned airtight cavity 10 is piezoelectric membrane 12, what facilitate piezoelectric membrane is arranged at installation, as piezoelectric membrane 12 is installed on non-piezoelectric film portion 13 etc., non-piezoelectric film portion 13 is generally hard shell, as non-conducting object such as duroplasts, hard silica gel, in other embodiments, non-piezoelectric film portion 13 also can be the electric conducting material compositions such as alloy sheets, but wants insulation processing between piezoelectric membrane; And whole sidewalls of airtight cavity 10 are piezoelectric membrane 12, then can increase the voice effect of piezoelectric membrane pronunciation device.
In the present embodiment, in order to improve the voice effect of above-mentioned piezoelectric membrane pronunciation device, the area of piezoelectric membrane 12 is the bigger the better with the ratio of the volume of closed cavity, because the area of piezoelectric membrane 12 is larger, the volume of airtight cavity 10 is less, when deformation occurs piezoelectric membrane 12, air pulsation in airtight cavity 10 is more obvious, sound intensity of wave can be larger, improves the voice effect of the piezoelectric membrane pronunciation device of the present embodiment, reduce the driving requirement of drive circuit.In one embodiment, if the area of piezoelectric membrane 12 is very little, and the volume of airtight cavity 10 is very large, there is deformation in piezoelectric membrane 12, although vibrations can be produced and make to produce in airtight cavity 10 sound wave, because airtight cavity 10 volume is too large, cause intensity of acoustic wave faint.
With reference to Fig. 2, in the present embodiment, above-mentioned piezoelectric membrane pronunciation device also comprises protective layer 20, and this protective layer 20 is arranged at the outside of piezoelectric membrane 12, and and has gap between piezoelectric membrane 12.The fragility because piezoelectric membrane 12 is compared; easy damage; so arrange a protective layer 20, it is protected; protective layer 20 is generally the structures such as latticed; and with piezoelectric membrane 12, there is certain gap; both can protect piezoelectric membrane 12, and piezoelectric membrane 12 and the contact of air can not be stopped again, the distortion of piezoelectric membrane 12 can not be hindered.Gap described in the present embodiment; refer to there is interval between the most of position between piezoelectric membrane 12 and protective layer 20; such as; the partial sidewall of airtight cavity 10 is piezoelectric membrane 12; so protective layer 20 can be fixedly installed in non-piezoelectric film portion 13; when whole sidewalls of airtight cavity 10 are piezoelectric membrane 12, so protective layer 20 can be fixedly installed on piezoelectric membrane 12 by support etc., or the edge portions of only matcoveredn 20 is fixedly installed on piezoelectric membrane 12.
With reference to Fig. 3, in the present embodiment, above-mentioned airtight cavity 10 is column, and the sidewall of column is that piezoelectric membrane 12 forms, and two ends arrange airtight cover plate 14, wherein an airtight cover plate 14 is arranged described sound hole 11 excessively; Column can increase the ratio between the inner wall area of airtight cavity 10 and airtight cavity 10 volume.In one embodiment, above-mentioned column is cylinder, and cylindrical length is longer, and cross section is less, and its voice effect is better.
With reference to Fig. 4, in another specific embodiment, the side of the cross section of above-mentioned column is bending ring-type repeatedly, namely the side of column is circumferentially for depression is arranged alternately with outstanding, as wavy etc., the area of piezoelectric membrane 12 can be increased, improve the ratio between the area of piezoelectric membrane 12 and the volume of airtight cavity 10, improve the voice effect of piezoelectric membrane pronunciation device.In order to protect piezoelectric membrane 12, arrange protective layer 20 equally outside piezoelectric membrane 12, protective layer 20 is fixedly installed in airtight cover plate 14.
With reference to Fig. 5, in another specifically embodiment, the side of the longitudinal section of above-mentioned column is bending ring-type repeatedly, namely the side of column is vertically for depression is arranged alternately with outstanding, as wavy etc., the area of piezoelectric membrane 12 can be increased equally, improve the ratio between the area of piezoelectric membrane 12 and the volume of airtight cavity 10, improve the voice effect of piezoelectric membrane pronunciation device.In order to protect piezoelectric membrane 12, arrange protective layer 20 equally outside piezoelectric membrane 12, protective layer 20 is fixedly installed in airtight cover plate 14.
In the present embodiment, the volume in above-mentioned airtight cavity 10 and the area ratio of piezoelectric membrane 12 are at least less than 1.5.Better can convert electrical signals to voice signal.
In the present embodiment, above-mentioned piezoelectric membrane pronunciation device also comprises Voltag driving circuit, and described Voltag driving circuit is connected with the input of described piezoelectric membrane 12; Voltage can be directly acted on piezoelectric membrane 12 by Voltag driving circuit, exists without inductance, there will not be the situation of voltage after front current hysteresis to occur, improves fidelity and the sensitivity of sound wave, can also obtain extremely wide frequency response.In one embodiment, the inside that above-mentioned Voltag driving circuit is arranged at airtight cavity 10 is run through described airtight cavity 10 by an electric installation and is connected with external power source, Voltag driving circuit is arranged in airtight cavity 10, reduces the overall volume of piezoelectric membrane pronunciation device, outside neat.In another embodiment, the outside that voltage driver is arranged at airtight cavity 10 is connected with power supply, arranges conveniently, improves installation effectiveness.
The piezoelectric membrane pronunciation device of the present embodiment, the feature that deformation can occur after utilizing piezoelectric membrane 12 to receive the signal of telecommunication fully realizes.When piezoelectric membrane 12 receives driving voltage, piezoelectric membrane 12 carries out deformation fast according to the size of receiver voltage, thus the gas pulsation in compression airtight cavity 10 generates sound wave, and sound wave can spread out of from crossing sound hole 11.Because the quality of piezoelectric membrane 12 is less than coil and the cone of prior art, and be that piezoelectric membrane 12 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.
With reference to Fig. 6 and Fig. 1, the embodiment of the present invention, also provides a kind of earphone, comprises piezoelectric membrane pronunciation device, sound guide tube 30 and earplug 40; Described piezoelectric membrane pronunciation device, comprises airtight cavity 10, and partial sidewall or whole sidewall of described airtight cavity 10 are piezoelectric membrane 12, and described airtight cavity 10 arranged sound hole 11; One end of described sound guide tube 30 is connected to airtight cavity 10, and this end port connects described sound hole 11 excessively; The other end of described sound guide tube 30 arranges described earplug 40; When piezoelectric membrane 12 receives driving voltage, deformation occurs piezoelectric membrane 12 makes the gas pulsation in airtight cavity 10 produce sound wave, and sound wave is passed to sound guide tube 30 along described sound hole 11 of crossing, and when people's ear filled in by earplug 40, sound wave is propagated in duct.
Above-mentioned piezoelectric membrane 12 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 12 has deformation, the feature that the signal of telecommunication produced is larger, same, when outside piezoelectric membrane 12 input electrical signal, can there is deformation in piezoelectric membrane 12, 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 partial sidewall of above-mentioned airtight cavity 10 is piezoelectric membrane 12, what facilitate piezoelectric membrane is arranged at installation, as piezoelectric membrane 12 is installed on non-piezoelectric film portion 13 etc., non-piezoelectric film portion 13 is generally hard shell, as non-conducting object such as duroplasts, hard silica gel, in other embodiments, non-piezoelectric film portion 13 also can be the electric conducting material compositions such as alloy sheets, but wants insulation processing between piezoelectric membrane; And whole sidewalls of airtight cavity 10 are piezoelectric membrane 12, then can increase the voice effect of piezoelectric membrane pronunciation device.
Above-mentioned sound guide tube 30, it is generally a kind of flexible pipe that can reel, be convenient for carrying and receive the free end that earplug 40 is arranged at sound guide tube 30, conveniently be fixed in the duct of human body by sound guide tube 30, and make sound guide tube 30 and duct form a relative airtight connection, earplug 4050 simply can close external auditory meatus, inner ear is made to form an airtight transaudient passage, after producing sound wave in airtight cavity 1010, the inner ear of people can be delivered to, produce obvious sonic stimulation at inner ear.、
In the present embodiment, in order to improve the voice effect of above-mentioned piezoelectric membrane pronunciation device, the area of piezoelectric membrane 12 is the bigger the better with the ratio of the volume of closed cavity, because the area of piezoelectric membrane 12 is larger, the volume of airtight cavity 10 is less, when deformation occurs piezoelectric membrane 12, air pulsation in airtight cavity 10 is more obvious, sound intensity of wave can be larger, improves the voice effect of the piezoelectric membrane pronunciation device of the present embodiment, reduce the driving requirement of drive circuit.In one embodiment, if the area of piezoelectric membrane 12 is very little, and the volume of airtight cavity 10 is very large, there is deformation in piezoelectric membrane 12, although vibrations can be produced and make to produce in airtight cavity 10 sound wave, because airtight cavity 10 volume is too large, cause intensity of acoustic wave faint.
With reference to Fig. 2, in the present embodiment, above-mentioned piezoelectric membrane pronunciation device also comprises protective layer 20, and this protective layer 20 is arranged at the outside of piezoelectric membrane 12, and and has gap between piezoelectric membrane 12.The fragility because piezoelectric membrane 12 is compared; easy damage; so arrange a protective layer 20, it is protected; protective layer 20 is generally the structures such as latticed; and with piezoelectric membrane 12, there is certain gap; both can protect piezoelectric membrane 12, and piezoelectric membrane 12 and the contact of air can not be stopped again, the distortion of piezoelectric membrane 12 can not be hindered.
With reference to Fig. 3, in the present embodiment, above-mentioned airtight cavity 10 is column, and the sidewall of column is that piezoelectric membrane 12 forms, and two ends arrange airtight cover plate 14, wherein an airtight cover plate 14 is arranged described sound hole 11 excessively; Column can increase the ratio between the inner wall area of airtight cavity 10 and airtight cavity 10 volume.In one embodiment, above-mentioned column is cylinder, and cylindrical length is longer, and cross section is less, and its voice effect is better.
With reference to Fig. 4, in another specific embodiment, the side of the cross section of above-mentioned column is bending ring-type repeatedly, namely the side of column is circumferentially for depression is arranged alternately with outstanding, as wavy etc., the area of piezoelectric membrane 12 can be increased, improve the ratio between the area of piezoelectric membrane 12 and the volume of airtight cavity 10, improve the voice effect of piezoelectric membrane pronunciation device.In order to protect piezoelectric membrane 12, arrange protective layer 20 equally outside piezoelectric membrane 12, protective layer 20 is fixedly installed in airtight cover plate 14.
With reference to Fig. 5, in another specifically embodiment, the side of the longitudinal section of above-mentioned column is bending ring-type repeatedly, namely the side of column is vertically for depression is arranged alternately with outstanding, as wavy etc., the area of piezoelectric membrane 12 can be increased equally, improve the ratio between the area of piezoelectric membrane 12 and the volume of airtight cavity 10, improve the voice effect of piezoelectric membrane pronunciation device.In order to protect piezoelectric membrane 12, arrange protective layer 20 equally outside piezoelectric membrane 12, protective layer 20 is fixedly installed in airtight cover plate 14.
In the present embodiment, the volume in above-mentioned airtight cavity 10 and the area ratio of piezoelectric membrane 12 are at least less than 1.5.Better can convert electrical signals to voice signal.
In the present embodiment, above-mentioned piezoelectric membrane pronunciation device also comprises Voltag driving circuit, and described Voltag driving circuit is connected with the input of described piezoelectric membrane 12; Voltage can be directly acted on piezoelectric membrane 12 by Voltag driving circuit, exists without inductance, there will not be the situation of voltage after front current hysteresis to occur, improves fidelity and the sensitivity of sound wave, can also obtain extremely wide frequency response.In one embodiment, the inside that above-mentioned Voltag driving circuit is arranged at airtight cavity 10 is run through described airtight cavity 10 by an electric installation and is connected with external power source, Voltag driving circuit is arranged in airtight cavity 10, reduces the overall volume of piezoelectric membrane pronunciation device, outside neat.In another embodiment, the outside that voltage driver is arranged at airtight cavity 10 is connected with power supply, arranges conveniently, improves installation effectiveness.
The earphone of the present embodiment, the feature that deformation can occur after utilizing piezoelectric membrane 12 to receive the signal of telecommunication fully piezoelectric membrane pronunciation device realizes.When piezoelectric membrane 12 receives driving voltage, piezoelectric membrane 12 carries out deformation fast according to the size of receiver voltage, thus the gas pulsation in compression airtight cavity 10 generates sound wave, and sound wave can spread out of from crossing sound hole 11.Because the quality of piezoelectric membrane 12 is less than coil and the cone of prior art, and be that piezoelectric membrane 12 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.
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 piezoelectric membrane pronunciation device, is characterized in that, comprises airtight cavity;
Partial sidewall or whole sidewall of described airtight cavity are piezoelectric membrane, and described airtight cavity arranged sound hole;
When piezoelectric membrane receives driving voltage, piezoelectric membrane generation deformation makes the gas pulsation in airtight cavity produce sound wave, and sound wave crosses along described the outside that sound hole is passed to airtight cavity.
2. piezoelectric membrane pronunciation device according to claim 1, is characterized in that, also comprise protective layer, and this protective layer is arranged at the outside of piezoelectric membrane, and and has gap between piezoelectric membrane.
3. piezoelectric membrane pronunciation device according to claim 1, is characterized in that, described airtight cavity is column, and the sidewall of column is piezoelectric membrane composition, and two ends arrange airtight cover plate, wherein an airtight cover plate is arranged described sound hole excessively;
Described column is cylinder; Or the side of the cross section of column is bending ring-type repeatedly; Or the side of the longitudinal section of column is bending ring-type repeatedly.
4. piezoelectric membrane pronunciation device according to claim 1, is characterized in that, the volume in described airtight cavity and the area ratio of piezoelectric membrane are at least less than 1.5.
5. the piezoelectric membrane pronunciation device according to any one of claim 1-4, is characterized in that, also comprise Voltag driving circuit, described Voltag driving circuit is connected with the input of described piezoelectric membrane; The inside that described Voltag driving circuit is arranged at airtight cavity is run through described airtight cavity by an electric installation and is connected with external power source, or the outside being arranged at airtight cavity is connected with power supply.
6. an earphone, is characterized in that, comprises piezoelectric membrane pronunciation device, sound guide tube and earplug;
Described piezoelectric membrane pronunciation device, comprises airtight cavity, and partial sidewall or whole sidewall of described airtight cavity are piezoelectric membrane, and described airtight cavity arranged sound hole;
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;
When piezoelectric membrane receives driving voltage, piezoelectric membrane generation deformation makes the gas pulsation in airtight cavity produce sound wave, and sound wave is passed to sound guide tube along described sound hole of crossing, 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 pronunciation device also comprises protective layer, and this protective layer is arranged at the outside of piezoelectric membrane, and and has gap between piezoelectric membrane.
8. earphone according to claim 6, is characterized in that, described airtight cavity is column, and the sidewall of column is piezoelectric membrane composition, and two ends arrange airtight cover plate, wherein an airtight cover plate is arranged described sound hole excessively;
Described column is cylinder; Or the side of the cross section of column is bending ring-type repeatedly; Or the side of the longitudinal section of column is bending ring-type repeatedly.
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, also comprises Voltag driving circuit, and described Voltag driving circuit is connected with the input of described piezoelectric membrane; The inside that described Voltag driving circuit is arranged at airtight cavity is run through described airtight cavity by an electric installation and is connected with external power source, or the outside being arranged at airtight cavity is connected with power supply.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510645991.3A CN105228066A (en) | 2015-09-30 | 2015-09-30 | Piezoelectric membrane pronunciation device and earphone |
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| CN201510645991.3A CN105228066A (en) | 2015-09-30 | 2015-09-30 | Piezoelectric membrane pronunciation device and earphone |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021031475A1 (en) * | 2019-08-21 | 2021-02-25 | 歌尔股份有限公司 | Acoustic device and electronic apparatus |
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