CN103458333A - High-fidelity high-anti-noise moving-coil microphone with excellent electromagnetic compatibility - Google Patents
High-fidelity high-anti-noise moving-coil microphone with excellent electromagnetic compatibility Download PDFInfo
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- CN103458333A CN103458333A CN2013103164155A CN201310316415A CN103458333A CN 103458333 A CN103458333 A CN 103458333A CN 2013103164155 A CN2013103164155 A CN 2013103164155A CN 201310316415 A CN201310316415 A CN 201310316415A CN 103458333 A CN103458333 A CN 103458333A
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Abstract
The invention discloses a high-fidelity high-anti-noise moving-coil microphone with excellent electromagnetic compatibility. The high-fidelity high-anti-noise moving-coil microphone comprises an outer shell and a cover body arranged on the outer shell, wherein a closed installing cavity is formed between the outer shell and the cover body, a positioning pole piece is arranged in the installing cavity and divides the installing cavity into a first chamber and a second chamber, a receding through hole is formed in the middle of the positioning pole piece, and the first chamber is communicated with the second chamber through the receding through hole. An air inlet is formed in the cover body and communicated with the first chamber, and the cover body is provided with a vibrating diaphragm which is fixedly connected with the positioning pole piece, covers the receding hole and is provided with a voice coil. A magnetic cover is arranged on the surface of the positioning pole piece, magnetic steel is fixedly arranged in the magnetic cover and extends to the receding through hole, a short circuit ring is arranged on the magnetic steel in a sleeved mode, the voice coil is arranged on the magnetic steel in a sleeved mode and can move on the magnetic steel back and forth, and vent holes are formed in the magnetic cover and the outer shell. Through the arrangement of the short circuit ring, the high-fidelity high-anti-noise moving-coil microphone has the advantages of being high in sensitivity, high in electromagnetic compatibility, good in anti-noise performance and low in distortion and is suitable for various working environments.
Description
Technical field
The present invention relates to the audio input device technical field, be specifically related to a kind of high anti-noise type dynamic microphones of high-fidelity with good Electro Magnetic Compatibility.
Background technology
Microphone is a kind of energy transducer that voice signal is converted to the signal of telecommunication; It can be divided into electrodynamic type, condenser type, electromagnetic type, piezoelectric type etc. by transduction principle; Can be divided into non-directive and directivity is arranged by the directivity that receives sound wave, having directivity to comprise heart-shaped sensing, strong sensing, double directing property etc.; And dynamic microphones is a kind of common microphone, it is mainly by vibrating diaphragm, voice coil loudspeaker voice coil, adopted magnet and stepup transformer etc. form forever; Its operation principle is for when the people faces toward microphone talk, diaphragm is just along with vibration before and after sound, thereby the drive voice coil loudspeaker voice coil is done the motion of cutting magnetic line in magnetic field, according to electromagnetic induction principle, will produce induction audio-frequency electric kinetic potential at the coil two ends, thereby complete the acoustic-electric conversion; Dynamic microphones is simple in structure, reliable and stable, easy to use, intrinsic noise is little, is widely used in language broadcast and sound reinforcement system; But the sensitivity of dynamic microphones is not high, about being-the 65dB left and right, in the situation that high electric field highfield easily is subject to electromagnetic interference, Electro Magnetic Compatibility is poor, can not adapt to the work under particular surroundings greatly.
Summary of the invention
For the technical problem of above-mentioned existence, the invention provides a kind of high anti-noise type dynamic microphones of high-fidelity with good Electro Magnetic Compatibility, it has high sensitivity, Electro Magnetic Compatibility is strong, and noiseproof feature is good, and low distortion is applicable to various operational environments.
Realize that technical scheme of the present invention is as follows:
A kind of high anti-noise type dynamic microphones of high-fidelity with good Electro Magnetic Compatibility, comprise shell, be arranged on the lid on shell, form the installation cavity of sealing between shell and lid, install in cavity and be provided with the location pole piece that is divided into the first chamber, the second chamber, pole piece middle part, described location offers the through hole of stepping down that is communicated with the first chamber, the second chamber, offer the air admission hole be communicated with the first chamber on lid, and be fixedly connected with the location pole piece and the above-mentioned through hole of stepping down is formed to the vibrating diaphragm hidden, be provided with voice coil loudspeaker voice coil on vibrating diaphragm; Be provided with on surface in the second chamber indoor positioning pole piece and cover this surperficial magnetic cover, be fixedly installed the magnet steel extended in the above-mentioned through hole of stepping down in the magnetic cover, be arranged with the short-circuited conducting sleeve with through hole on described magnet steel, described voice coil loudspeaker voice coil is enclosed within on magnet steel and can reciprocating motion on magnet steel; All offer air vent hole on described magnetic cover, shell.
Further, on the surface in the second chamber indoor positioning pole piece, offer groove, above-mentioned short circuit is arranged in groove.The one, be convenient to the assembling to short-circuited conducting sleeve, spacing by short-circuited conducting sleeve; The 2nd, can make short-circuited conducting sleeve play better short circuit effect to voice coil loudspeaker voice coil, avoid the electric current of voice coil loudspeaker voice coil to cause the variation in magnetic field.
Further, the through hole on described short-circuited conducting sleeve is provided with a plurality of, be distributed in short-circuited conducting sleeve around, be provided with the dustproof damping cloth that through hole on short-circuited conducting sleeve is blocked on short-circuited conducting sleeve.The setting of through hole is for gas between the first chamber, the second chamber keeps balance, improves the stability of microphone; On short-circuited conducting sleeve, a sticky dustproof damping cloth has effectively been isolated magnetic loop and magnetic cover inner chamber, can play dustproof and adjustment product frequency response effect.
Further, in described the first chamber, be provided with enter the Air Filter that the medium in the first chamber is filtered from air admission hole.Can prevent that external impurities, dust from entering in the first chamber, cause the impact on vibrating diaphragm, guarantee the sensitivity of vibrating diaphragm.
Further, the installation for the ease of to the location pole piece is fixedly installed support between described shell and lid, and above-mentioned location pole piece is installed on support and forms one with support.The magnetic cover is fixed in the location pole piece by glue, forms a magnetic system, and magnetic system is fixed between protecgulum and shell by locating support.
Further, described magnet steel comprises the magnet steel that cross section is taper, and the magnetic conduction pole piece be fixedly connected with magnet steel, and above-mentioned short-circuited conducting sleeve, voice coil loudspeaker voice coil are enclosed within on the magnetic conduction pole piece.Because the size of voice coil loudspeaker voice coil is smaller, adopt the magnet steel of taper, floor space is larger than upper area, make magnetic energy product become large, the magnetic induction line number of voice coil loudspeaker voice coil cutting becomes many like this, so produced relatively large electric current in the coil of voice coil loudspeaker voice coil, can play the effect that improves sensitivity of microphone.Magnet steel is connected on the magnetic cover by soft magnetism is gluing, adopt the taper magnet steel larger than the long-pending change of the magnetic surface of traditional column type magnet steel, it is large that the magnetic contact area also just becomes, make like this magnetic gap diminish, it is large that the upper surface magnetic intensity becomes, adopt great on bottom and small on top structure, also make the adhesion steadiness of magnet steel and magnetic cover strengthen.
Further, described magnet steel is together with employing soft magnetism glue bond between the magnetic cover.So-called soft magnetism glue is exactly to mix some soft magnetic materials in glue, makes glue can have the performance of magnetic conduction.
Further, described magnetic cover is the magnetic cover that the nickel alloy material is made, and makes the magnetic cover have good magnetic screening action.
Further, described magnet steel is alnico magnet, replaces existing rare earth material Nd-Fe-B magnet steel, when greatly having saved cost, alnico magnet is designed to taper, makes it have the energy quality ratio the same with Nd-Fe-B magnet steel.
Further, described short-circuited conducting sleeve is that non-magnetic copper product is made.
Further, on the air vent hole on described magnetic cover, shell, be provided with damping paper, sound wave can spread out of by the aperture on damping paper like this, makes its noise immunity, and fidelity is better.
Further, described magnetic cover is different from the permeability of magnet steel.The two medias different magnetic permeability put together, and on their interface, will undergo mutation in magnetic field, and at this moment the size and Orientation of magnetic induction density B all will change, that is to say, caused the refraction of magnetic induction line, made the magnetic field in the magnetic cover simultaneously, magnet steel does not to external world exert an influence.
Adopted such scheme, can evoke the sound wave of propagating to surrounding when we speak, sound wave causes the vibration of ambient air.When speaking facing to microphone of the present invention, the sound wave that the produces air vent hole by protecgulum of speaking enters in the first chamber and is transmitted to vibrating diaphragm, cause the vibration of vibrating diaphragm, vibrating diaphragm is along with vibration before and after sound has just driven the voice coil loudspeaker voice coil porpoise be enclosed within on magnet steel, porpoise along with voice coil loudspeaker voice coil, voice coil loudspeaker voice coil has just been done the magnetic induction line motion that the cutting magnet steel produces, voice coil loudspeaker voice coil bonds together by glue and vibrating diaphragm, and be fixed on the pole piece of location, short-circuited conducting sleeve can shield the impact of large current signal on microphone, can improve the magnetic circuit gap simultaneously, reduce the generation of distortion, our one's voice in speech is that size constantly changes, the amplitude of coil and frequency are also along with vibration changes, the faradic size and Orientation produced also just constantly changes.The existence of short-circuited conducting sleeve can the shield electromagnetic interference signal, and microphone itself is exactly noise reducing type, microphone sensing figure is " heart " type, microphone is sensitiveer to the sound wave of front, sound wave to both sides and the back side is more blunt, so just can effectively filter the interference to the microphone electroacoustics system of both sides and noise behind; Because the signal of microphone output is still fainter, easily be subject to the impact of external magnetic field, we adopt the magnetic cover to prevent the impact of extraneous high-intensity magnetic field on the microphone magnetic circuit, in order to strengthen the effect of shielding, we adopt soft magnetism glue, mix some soft magnetic materials in glue, make glue can there is the performance of magnetic conduction, thereby the effect of shielding also strengthens thereupon.The magnetic cover by glue be fixed in the location pole piece on, form a magnetic system, shell is provided with an air vent hole, but this air vent hole of sound wave spread out of, make its noise immunity better; And sound wave takes vibrating diaphragm ceaselessly motion in permanent magnetic field to, completed the process that acoustical signal is converted into to the signal of telecommunication.
Increase a short-circuited conducting sleeve in the present invention, effectively play the effect of shielding high voltage electric field, short-circuited conducting sleeve plays the secondary coil effect of voice coil loudspeaker voice coil, effect due to its short circuit, make the voice coil loudspeaker voice coil inductance close to zero, reduce and improve the magnetic line of force nonlinear Distribution at magnetic gap place, and make the magnetic line of force of magnetic gap more concentrated be distributed in magnetic gap, make magnetic material nonlinear inductance quantitative changeization little, distortion reduces; Produce the eddy current of the voice coil loudspeaker voice coil opposite current raise with frequency in short-circuited conducting sleeve, impedance is reduced, because the electric current of voice coil loudspeaker voice coil can cause a lot of changes of magnetic field originally, after being arranged now, short-circuited conducting sleeve can only cause very little changes of magnetic field, so the voice coil loudspeaker voice coil inductance has reduced, make the voice coil loudspeaker voice coil input current increase, Simultaneous Stabilization magnetic field, thereby the microphone high frequency output is increased, and frequency range is large.The present invention can make by being provided with short-circuited conducting sleeve that it has high sensitivity, Electro Magnetic Compatibility is strong, and the advantage that noiseproof feature is good, be applicable to various operational environments.
The accompanying drawing explanation
Fig. 1 is sectional structure schematic diagram of the present invention;
The structural representation that Fig. 2 is short-circuited conducting sleeve in the present invention;
The frequency response curve figure that Fig. 3 is microphone of the present invention;
In accompanying drawing, 1 is shell, and 2 is lid, and 3 for installing cavity, 4 is the first chamber, and 5 is the second chamber, and 6 is the location pole piece, and 7 for stepping down through hole, 8 is air admission hole, and 9 is vibrating diaphragm, and 10 is voice coil loudspeaker voice coil, and 11 is the magnetic cover, 12 is magnet steel, and 13 is the magnetic conduction pole piece, and 14 is through hole, and 15 is short-circuited conducting sleeve, 16 is air vent hole, and 17 is groove, and 18 is dustproof damping cloth, and 19 is Air Filter, 20 is support, and 21 is limited step, and 22 is damping paper.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further described.
Referring to Fig. 1,2,3, a kind of high anti-noise type dynamic microphones of high-fidelity with good Electro Magnetic Compatibility, comprise shell 1, be arranged on the lid 2 on shell, between shell and lid, adopts screw thread or interference mode to be assembled together; Form the installation cavity 3 of sealing between shell and lid, install in cavity and be provided with the location pole piece 6 that is divided into the first chamber 4, the second chamber 5, pole piece middle part, location offers the through hole 7 of stepping down that is communicated with the first chamber, the second chamber, offer the air admission hole 8 be communicated with the first chamber on lid, and be fixedly connected with the location pole piece and the above-mentioned through hole of stepping down is formed to the arc vibrating diaphragm 9 hidden, be connected with voice coil loudspeaker voice coil 10 by glue on vibrating diaphragm 9, when vibrating diaphragm vibrates, voice coil loudspeaker voice coil can move thereupon together like this;
Be provided with on surface in the second chamber indoor positioning pole piece and cover this surperficial magnetic cover 11, be fixedly installed the magnet steel extended in the above-mentioned through hole 7 of stepping down in the magnetic cover, magnet steel comprises the magnet steel 12 that cross section is taper, and the cylinder magnetic conduction pole piece 13 be fixedly connected with magnet steel, be arranged with the short-circuited conducting sleeve 15 with through hole 14 on the magnetic conduction pole piece, voice coil loudspeaker voice coil 10 is enclosed within on the magnetic conduction pole piece and can reciprocating motion on the magnetic conduction pole piece; Short-circuited conducting sleeve is that copper product is made, and is non-magnetizer; All offer air vent hole 16 on magnetic cover 11, shell 1.Offer 4 air vent holes on magnetic cover 11, be distributed in magnetic cover inwall; Magnet steel is alnico magnet, and the magnetic conduction pole piece also can be made for aluminium nickel cobalt material, can certainly adopt other permeability magnetic materials to make.
For the ease of the installation to the location pole piece, fix, be fixedly installed support 20 between shell and lid, above-mentioned location pole piece is installed on support and forms one with support, and support is limited on lid by the limited step 21 on shell, realizes that support is fixed between shell and lid; Magnet steel 12 is together with employing soft magnetism glue bond between magnetic cover 11, adopt an end face and the magnetic cover that soft magnetism glue is large by the magnet steel diameter to bond together, the soft magnetism glue here is exactly fusion soft magnetic bodies in glue and forms, soft magnetic bodies has the magnetic conduction function, soft magnetic bodies is what can buy in the market, can carry out smoothly magnetic conduction between magnetic cover and magnet steel like this, magnet steel and magnetic cover can be considered and be wholely set basically.Be provided with damping paper 22 on air vent hole 16 on magnetic cover 11, shell 1, sound wave can spread out of by the aperture on damping paper like this, makes its noise immunity better.
In concrete enforcement, the magnetic cover that magnetic cover 11 is made for the nickel alloy material.The magnetic cover is positioned at the outside of magnet steel, makes magnet steel and external magnetic field isolation.The cover that uses iron-nickel alloy to make, be placed in external magnetic field, due to magnetic cover magnetic permeability μ than air magnetic permeability mu.Much bigger, thus most magnetic field line in the wall of magnetic cover, pass through, and the magnetic cover in cavity in, magnetic induction line is seldom.This has just reached the purpose of external magnetic field magnetic screen.The permeability of magnetic cover is different with the permeability of magnet steel, the two medias different magnetic permeability put together, on their interface, will undergo mutation in magnetic field, at this moment the size and Orientation of magnetic induction density B all will change, that is to say, caused the refraction of magnetic induction line, made the magnetic field in the magnetic cover simultaneously, magnet steel does not to external world exert an influence.Adopt the soft magnetism glue bond simultaneously, can reduce magnetic resistance.
From the microphone frequency response curve figure shown in Fig. 3, can find out, the sensitivity of microphone is-54dB, frequency band between 50-16000Hz, curve smoothing, noiseproof feature is good, low distortion.
Operation principle of the present invention: when speaking facing to microphone of the present invention, the sound wave that the produces air vent hole by protecgulum of speaking enters in the first chamber and is transmitted to vibrating diaphragm, cause the vibration of vibrating diaphragm, vibrating diaphragm is along with vibration before and after sound has just driven the voice coil loudspeaker voice coil porpoise be enclosed within on magnet steel, porpoise along with voice coil loudspeaker voice coil, voice coil loudspeaker voice coil has just been done the magnetic induction line motion that the cutting magnet steel produces, short-circuited conducting sleeve can shield the impact of large current signal on microphone, can improve the magnetic circuit gap simultaneously, reduce the generation of distortion, our one's voice in speech is that size constantly changes, the amplitude of coil and frequency are also along with vibration changes, the faradic size and Orientation produced also just constantly changes.The existence of short-circuited conducting sleeve can the shield electromagnetic interference signal, and microphone itself is exactly noise reducing type, microphone sensing figure is " heart " type, microphone is sensitiveer to the sound wave of front, sound wave to both sides and the back side is more blunt, so just can effectively filter the interference to the microphone electroacoustics system of both sides and noise behind; Because the signal of microphone output is still fainter, easily be subject to the impact of external magnetic field, we adopt the magnetic cover to prevent the impact of extraneous high-intensity magnetic field on the microphone magnetic circuit, in order to strengthen the effect of shielding, adopt soft magnetism glue, mix some soft magnetic materials in glue, make glue can there is the performance of magnetic conduction, thereby the effect of shielding also strengthens thereupon.The magnetic cover by glue be fixed in the location pole piece on, form a magnetic system, shell is provided with an air vent hole, but this air vent hole of sound wave spread out of, make its noise immunity better; And sound wave takes vibrating diaphragm ceaselessly motion in permanent magnetic field to, completed the process that acoustical signal is converted into to the signal of telecommunication.The present invention adopts the structure of short-circuited conducting sleeve and magnetic cover to make product itself have the effect of good electric magnetic screen, and along with the difference of environment for use, the high anti-noise type dynamic microphones of compatible high-fidelity has good advantage in environment for use and stable performance.
Above-described is only embodiments of the present invention, at this, it should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise of the invention, can also make improvement, but these all belongs to protection scope of the present invention.
Claims (10)
1. the high anti-noise type dynamic microphones of high-fidelity with good Electro Magnetic Compatibility, it is characterized in that, comprise shell, be arranged on the lid on shell, form the installation cavity of sealing between shell and lid, install in cavity and be provided with and be divided into the first chamber, the location pole piece of the second chamber, pole piece middle part, described location offers and is communicated with the first chamber, the through hole of stepping down of the second chamber, offer the air admission hole be communicated with the first chamber on lid, and be fixedly connected with the location pole piece and the above-mentioned through hole of stepping down is formed to the vibrating diaphragm hidden, be provided with voice coil loudspeaker voice coil on vibrating diaphragm,
Be provided with on surface in the second chamber indoor positioning pole piece and cover this surperficial magnetic cover, be fixedly installed the magnet steel extended in the above-mentioned through hole of stepping down in the magnetic cover, be arranged with the short-circuited conducting sleeve with through hole on described magnet steel, described voice coil loudspeaker voice coil is enclosed within on magnet steel and can reciprocating motion on magnet steel; All offer air vent hole on described magnetic cover, shell.
2. a kind of high anti-noise type dynamic microphones of high-fidelity with good Electro Magnetic Compatibility according to claim 1, is characterized in that, offer groove on the surface in the second chamber indoor positioning pole piece, above-mentioned short-circuited conducting sleeve is arranged in groove.
3. a kind of high anti-noise type dynamic microphones of high-fidelity with good Electro Magnetic Compatibility according to claim 1, it is characterized in that, through hole on described short-circuited conducting sleeve is provided with a plurality of, be distributed in short-circuited conducting sleeve around, be provided with the dustproof damping cloth that through hole on short-circuited conducting sleeve is blocked on short-circuited conducting sleeve.
4. a kind of high anti-noise type dynamic microphones of high-fidelity with good Electro Magnetic Compatibility according to claim 1, is characterized in that, in described the first chamber, is provided with enter the Air Filter that the medium in the first chamber is filtered from air admission hole.
5. a kind of high anti-noise type dynamic microphones of high-fidelity with good Electro Magnetic Compatibility according to claim 1, is characterized in that, described magnetic cover is different from the permeability of magnet steel.
6. a kind of high anti-noise type dynamic microphones of high-fidelity with good Electro Magnetic Compatibility according to claim 1, it is characterized in that, described magnet steel comprises the magnet steel that cross section is taper, and the magnetic conduction pole piece be fixedly connected with magnet steel, and above-mentioned short-circuited conducting sleeve, voice coil loudspeaker voice coil are enclosed within on the magnetic conduction pole piece.
7. a kind of high anti-noise type dynamic microphones of high-fidelity with good Electro Magnetic Compatibility according to claim 1, is characterized in that, described magnet steel is together with employing soft magnetism glue bond between the magnetic cover.
8. according to the described a kind of high anti-noise type dynamic microphones of high-fidelity with good Electro Magnetic Compatibility of any one in claim 1-7, it is characterized in that, described magnetic cover is the magnetic cover that the nickel alloy material is made.
9. according to the described a kind of high anti-noise type dynamic microphones of high-fidelity with good Electro Magnetic Compatibility of any one in claim 1-7, it is characterized in that, described magnet steel is alnico magnet.
10. according to the described a kind of high anti-noise type dynamic microphones of high-fidelity with good Electro Magnetic Compatibility of any one in claim 1-7, it is characterized in that, described short-circuited conducting sleeve is that copper product is made.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310316415.5A CN103458333B (en) | 2013-07-25 | 2013-07-25 | A kind of high anti-noise type dynamic microphones of high-fidelity with good Electro Magnetic Compatibility |
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| CN201310316415.5A CN103458333B (en) | 2013-07-25 | 2013-07-25 | A kind of high anti-noise type dynamic microphones of high-fidelity with good Electro Magnetic Compatibility |
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| CN103458333A true CN103458333A (en) | 2013-12-18 |
| CN103458333B CN103458333B (en) | 2016-05-25 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019128425A1 (en) * | 2017-12-26 | 2019-07-04 | 歌尔股份有限公司 | Electroacoustic device |
| CN110418252A (en) * | 2018-04-27 | 2019-11-05 | 张百良 | A kind of damping short-loop of electromagnetic driver |
| CN112954557A (en) * | 2021-03-01 | 2021-06-11 | 潍坊歌尔微电子有限公司 | Microphone and electronic device |
| CN114640929A (en) * | 2022-04-18 | 2022-06-17 | 歌尔股份有限公司 | Sound production device and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1788842A2 (en) * | 2005-11-21 | 2007-05-23 | Pioneer Corporation | Speaker apparatus |
| CN101378604A (en) * | 2007-08-27 | 2009-03-04 | 日本胜利株式会社 | Voice coil and speaker |
| CN201438738U (en) * | 2009-05-08 | 2010-04-14 | 瑞声声学科技(常州)有限公司 | Active noise cancellation system |
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2013
- 2013-07-25 CN CN201310316415.5A patent/CN103458333B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1788842A2 (en) * | 2005-11-21 | 2007-05-23 | Pioneer Corporation | Speaker apparatus |
| CN101378604A (en) * | 2007-08-27 | 2009-03-04 | 日本胜利株式会社 | Voice coil and speaker |
| CN201438738U (en) * | 2009-05-08 | 2010-04-14 | 瑞声声学科技(常州)有限公司 | Active noise cancellation system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019128425A1 (en) * | 2017-12-26 | 2019-07-04 | 歌尔股份有限公司 | Electroacoustic device |
| CN110418252A (en) * | 2018-04-27 | 2019-11-05 | 张百良 | A kind of damping short-loop of electromagnetic driver |
| CN112954557A (en) * | 2021-03-01 | 2021-06-11 | 潍坊歌尔微电子有限公司 | Microphone and electronic device |
| CN114640929A (en) * | 2022-04-18 | 2022-06-17 | 歌尔股份有限公司 | Sound production device and electronic equipment |
| CN114640929B (en) * | 2022-04-18 | 2023-12-22 | 歌尔股份有限公司 | Sound producing device and electronic equipment |
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| CN103458333B (en) | 2016-05-25 |
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