CN107318073A - Loudspeaker module and electronic equipment - Google Patents

Loudspeaker module and electronic equipment Download PDF

Info

Publication number
CN107318073A
CN107318073A CN201710628026.4A CN201710628026A CN107318073A CN 107318073 A CN107318073 A CN 107318073A CN 201710628026 A CN201710628026 A CN 201710628026A CN 107318073 A CN107318073 A CN 107318073A
Authority
CN
China
Prior art keywords
resonant cavity
operatic tunes
accommodating chamber
loudspeaker module
cavity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710628026.4A
Other languages
Chinese (zh)
Inventor
高远
李振军
陈钢
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Goertek Inc
Original Assignee
Goertek Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Goertek Inc filed Critical Goertek Inc
Priority to CN201710628026.4A priority Critical patent/CN107318073A/en
Priority to PCT/CN2017/102762 priority patent/WO2019019325A1/en
Publication of CN107318073A publication Critical patent/CN107318073A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02Details
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06Loudspeakers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2400/00Loudspeakers
    • H04R2400/11Aspects regarding the frame of loudspeaker transducers

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Abstract

The invention discloses a kind of loudspeaker module and electronic equipment.The module includes module casing and sound-producing device, accommodating chamber and multiple resonant cavities is provided with module casing, sound-producing device is arranged in accommodating chamber, accommodating chamber is divided into the preceding operatic tunes and the rear operatic tunes by sound-producing device, the preceding operatic tunes is connected by sound mouth with exterior space;Multiple resonant cavities are mutually isolated, and each resonant cavity is connected by respective communicating passage with the preceding operatic tunes of module casing.In this way, the multiple resonant cavities being arranged in parallel can improve the sounding effect of loudspeaker module.

Description

Loudspeaker module and electronic equipment
Technical field
The present invention relates to electroacoustic switch technology field, more particularly, to a kind of loudspeaker module and electronic equipment.
Background technology
In existing loudspeaker module, in order to reduce noise, closed resonant cavity is generally set on module casing.Altogether The chamber that shakes is connected with the preceding operatic tunes.Resonant cavity has apparent improvement to loudspeaker module FR.
However, existing resonant cavity is single cavity.The unicity of intrinsic frequency is limited to, the resonant cavity regulating frequency Limited width, it is impossible to the effective noise for absorbing more wide-band.
In addition, single cavity is smaller in the transmission loss of setting frequency range.
The content of the invention
It is an object of the present invention to provide a kind of new solution of loudspeaker module.
There is provided a kind of loudspeaker module according to the first aspect of the invention.The module includes module casing and sounding is filled Put, accommodating chamber and multiple resonant cavities be provided with the module casing, the sound-producing device is arranged in the accommodating chamber, The accommodating chamber is divided into the preceding operatic tunes and the rear operatic tunes by the sound-producing device, and the preceding operatic tunes is connected by sound mouth and exterior space It is logical;Multiple resonant cavities are mutually isolated, before each resonant cavity is by respective communicating passage and the module casing The operatic tunes is connected.
Alternatively, multiple resonant cavities include the first resonant cavity and the second resonant cavity, first resonant cavity and described Second resonant cavity is neighbour to be set, and the first communicating passage is provided between first resonant cavity and the preceding operatic tunes, described The second communicating passage is provided between second resonant cavity and the preceding operatic tunes.
Alternatively, first resonant cavity and second resonant cavity with the preceding operatic tunes is neighbour sets, and described the One resonant cavity and second resonant cavity are located at the sidepiece of the preceding operatic tunes.
Alternatively, the module casing includes upper casing, middle shell, bonnet and lower cover, and the middle shell includes side wall and by described Accommodating chamber vacancy section and multiple resonant cavity vacancy sections that side wall is enclosed;The upper casing is covered in the accommodating chamber vacancy section And the upper end of the multiple resonant cavity vacancy section, the bonnet covers the lower end in the accommodating chamber vacancy section, the lower cover The lower end in the multiple resonant cavity vacancy section is covered, the accommodating chamber and multiple resonant cavities are formed to enclose;Institute State the communicating passage being provided with the wall of side for connecting each resonant cavity and the accommodating chamber.
Alternatively, at least one in the upper casing, the bonnet and the lower cover uses ultrasound between the middle shell It is welded together.
Alternatively, the middle shell is integrated injection molding.
Alternatively, the resonant cavity is the airtight cavity being independently arranged.
Alternatively, the resonant cavity is the small cavity isolated by a large cavity by dividing plate.
Alternatively, the preceding operatic tunes is located at the sidepiece of the rear operatic tunes.
There is provided a kind of electronic equipment according to another aspect of the present invention.The electronic equipment includes what the present invention was provided Described loudspeaker module.
It was found by the inventors of the present invention that in the prior art, the resonant cavity of loudspeaker module is single cavity.It is limited to The unicity of intrinsic frequency, the resonant cavity regulating frequency limited width, it is impossible to the effective noise for absorbing more wide-band.In addition, Single cavity is smaller in the transmission loss of setting frequency range.Therefore, the present invention to be realized technical assignment or to be solved Technical problem be it is that those skilled in the art never expect or it is not expected that, therefore the present invention is a kind of new technical side Case.
In embodiments of the present invention, multiple resonant cavities are provided with module casing.Multiple resonant cavities are mutually isolated, each Resonant cavity is connected by respective communicating passage with the preceding operatic tunes of module casing.Multiple resonant cavities being arranged in parallel can produce position Formant at multiple resonant frequencies.The scope of resonance bands, energy are adjusted by adjusting the volumes of multiple resonant cavities, shape Enough expand the controllable frequency band scope of multiple resonant cavities;
Either, make that multiple formants are close to each other by adjusting multiple resonant cavity volumes, shape, this causes setting frequency range On transmission loss will produce superposition, such loudspeaker module is strengthened in the effect of the absorption noise of setting frequency range.
By referring to the drawings to the detailed description of the exemplary embodiment of the present invention, further feature of the invention and its Advantage will be made apparent from.
Brief description of the drawings
The accompanying drawing for being combined in the description and constituting a part for specification shows embodiments of the invention, and even It is used for the principle for explaining the present invention together with its explanation.
Fig. 1 is the exploded view of loudspeaker module according to an embodiment of the invention.
Fig. 2 is the structural representation of the module casing according to an embodiment of the invention for being not provided with lower cover and bonnet.
Fig. 3 is the sectional view of loudspeaker module according to an embodiment of the invention.
Fig. 4 is the transmission of loudspeaker module according to an embodiment of the invention and the loudspeaker module of single resonant cavity The comparison diagram of loss.
Description of reference numerals:
11:First resonant cavity;12:Second resonant cavity;13:Middle shell;14:Upper casing;15:Bonnet;17:Lower cover;18:Preceding sound Chamber;19:The operatic tunes afterwards;20:Dividing plate;21:First communicating passage;22:Second communicating passage;23:Loudspeaker monomer;24:Magnetic conductive board.
Embodiment
The various exemplary embodiments of the present invention are described in detail now with reference to accompanying drawing.It should be noted that:Unless had in addition Body illustrates that the part and the positioned opposite of step, numerical expression and numerical value otherwise illustrated in these embodiments does not limit this The scope of invention.
The description only actually at least one exemplary embodiment is illustrative below, never as to the present invention And its any limitation applied or used.
It may be not discussed in detail for technology, method and apparatus known to person of ordinary skill in the relevant, but suitable In the case of, the technology, method and apparatus should be considered as a part for specification.
In shown here and discussion all examples, any occurrence should be construed as merely exemplary, without It is as limitation.Therefore, other examples of exemplary embodiment can have different values.
It should be noted that:Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi It is defined, then it need not be further discussed in subsequent accompanying drawing in individual accompanying drawing.
Fig. 1 is the exploded view of loudspeaker module according to an embodiment of the invention.Fig. 2 is one according to the present invention The structural representation of the module casing for being not provided with lower cover and bonnet of embodiment.Fig. 3 is according to an embodiment of the invention The sectional view of loudspeaker module.
As shown in Figure 1-2, the loudspeaker module includes module casing and sound-producing device.Receiving is provided with module casing Chamber and multiple resonant cavities.Sound-producing device is arranged in accommodating chamber.Accommodating chamber is divided into the preceding operatic tunes 18 and rear sound by sound-producing device Chamber 19.The preceding operatic tunes 18 is connected by sound mouth with exterior space.
Multiple resonant cavities are mutually isolated, and each resonant cavity is connected by the preceding operatic tunes 18 of respective communicating passage and module casing It is logical.
Sound-producing device can be moving iron type loud-speaker monomer or coil-moving speaker monomer.Both monomers are this area Common knowledge, do not elaborate herein.
Resonant cavity is closed cavity.In the present invention, multiple resonant cavities are arranged in parallel.It is arranged in parallel and refers to multiple resonance Do not connected between chamber, each resonant cavity is connected with the preceding operatic tunes.
In embodiments of the present invention, resonant cavity can be the airtight cavity being independently arranged.Multiple airtight cavities are each independent, It is not attached to lead to.Multiple airtight cavities are arranged in parallel relative to the preceding operatic tunes 18.
Can also be that resonant cavity is by dividing plate 20 to isolate small cavity by a large cavity.Multiple small cavitys are each only It is vertical, it is not attached to lead to.Multiple small cavitys are arranged in parallel relative to the preceding operatic tunes 18.This mode makes the making of resonant cavity become simple, And the compact conformation of module casing.
Resonant cavity shape can be, but not limited to, cuboid, spheroid, cone etc. or those skilled in the art's root The cavity with irregular structure designed according to the shape of equipment headspace to be installed.
In embodiments of the present invention, multiple resonant cavities are provided with module casing.Multiple resonant cavities are mutually isolated, each Resonant cavity is connected by respective communicating passage with the preceding operatic tunes of module casing.Multiple resonant cavities being arranged in parallel can produce position Formant at multiple resonant frequencies.The scope of resonance bands, energy are adjusted by adjusting the volumes of multiple resonant cavities, shape Enough expand the controllable frequency band scope of multiple resonant cavities;
Either, make that multiple formants are close to each other by adjusting multiple resonant cavity volumes, shape, this causes setting frequency range On transmission loss will produce superposition, such loudspeaker module is strengthened in the effect of the absorption noise of setting frequency range.
In one example, as Figure 1-3, module casing includes upper casing 14, middle shell 13, bonnet 15 and lower cover 17.In Shell 13 is engraved structure.Middle shell 13 includes side wall and the accommodating chamber vacancy section enclosed by side wall and multiple resonant cavity hollow outs Area.
Upper casing 14 covers the upper end in accommodating chamber vacancy section and multiple resonant cavity vacancy sections, and bonnet 15 is covered in accommodating chamber The lower end of vacancy section, lower cover 17 covers the lower end in multiple resonant cavity vacancy sections, and accommodating chamber and multiple resonance are formed to enclose Chamber.
The communicating passage for connecting each resonant cavity and accommodating chamber is provided with the wall of side.
It should be noted that the direction of vibration of the upper and lower vibrating diaphragm for being oriented parallel to loudspeaker monomer 23.Loudspeaker monomer will Accommodating chamber is divided into the preceding operatic tunes 18 and the rear operatic tunes 19.Communicating passage is connected with the preceding operatic tunes 18.
For example, upper casing 14, bonnet 15 and lower cover 17 are in flat structure.Bonnet 15 is made by metal material, to subtract The thickness of few module casing.Also, the heat dispersion of metal material is good.Magnetic conductive board 24 is embedded with bonnet 15.Loudspeaker Monomer 23 is fixed on magnetic conductive board 24, wherein, the magnetic circuit system of loudspeaker monomer 23 is close to magnetic conductive board 24.
In this way, the making of module casing becomes easy.For example, upper casing 14, middle shell 13, lower cover 17 are by TPU materials Material is made by the way of injection molding.Bonnet 15 is made by sheet metal by stamping forming mode.
In addition, middle shell 13 is the structure of hollow out.In integrated injection molding, mould need not use sliding block, so as to reduce The injection difficulty of middle shell 13.
In addition, the installation of loudspeaker monomer 23 becomes easy.Engraved for example, loudspeaker monomer 23 is directly mounted to accommodating chamber In dead zone.The vibrating diaphragm of loudspeaker monomer 23 is relative with upper casing 14.Space between vibrating diaphragm and upper casing 14 for the preceding operatic tunes 18 at least A part.The magnetic circuit system of loudspeaker monomer 23 is bonded and fixed on magnetic conductive board 24.
Alternatively, at least one in upper casing 14, bonnet 15 and lower cover 17 is connected between middle shell 13 using ultra-sonic welded Together.Ultra-sonic welded has speed of welding fast, the characteristics of being connected firmly.For example, upper casing 14, middle shell 13 and lower cover 17 are TPU Material.Upper casing 14 is welded to the upper end of middle shell 13 using ultra-sonic welded, lower cover 17 is welded to the lower end of middle shell 13.
Alternatively, the rear operatic tunes 19 is located at the sidepiece of the preceding operatic tunes 18.The height of module casing can so be reduced.This area skill Art personnel are it should be appreciated that sidepiece refers to the sidepiece of the extended surface along the preceding operatic tunes.
Preferably, multiple resonant cavities are set up in parallel.In this example embodiment, multiple resonant cavities are in integrally elongate configuration.So, subtract The overall width of small multiple resonant cavities and height so that loudspeaker module is compacter.
In one example, multiple resonant cavities of loudspeaker module include the first resonant cavity 11 and the second resonant cavity 12.The One resonant cavity 11 and the neighbour setting of the second resonant cavity 12.It is mutual by dividing plate 20 between first resonant cavity 11 and the second resonant cavity 12 Isolation.
As Figure 2-3, neighbour setting refers to that the first resonant cavity 11 and the second resonant cavity 12 are arranged side by side and are disposed adjacent.First Resonant cavity 11 is connected by the first communicating passage 21 with the preceding operatic tunes 18.Second resonant cavity 12 passes through the second communicating passage 22 and preceding sound Chamber 18 is connected.Two resonant cavities 11,12 collectively form a resonator system.
Fig. 4 is the transmission of loudspeaker module according to an embodiment of the invention and the loudspeaker module of single resonant cavity The comparison diagram of loss.
Transmission loss, which can react loudspeaker module, can eliminate the frequency range of noise.
As shown in phantom in figure 4, single resonant cavity is only capable of forming a resonance peak.As shown by the bold lines in fig, two Individual resonant cavity is in two frequency formation resonance peaks.Resonance bands are adjusted by the volume of two resonant cavities 11,12 of adjustment, shape Scope, can expand the controllable frequency band scope of two resonant cavities 11,12;
Either, make that two formants are close to each other by adjusting the volumes of two resonant cavities 11,12, shape, this causes Transmission loss in setting frequency range will produce superposition, and such loudspeaker module is obtained in the effect of the absorption noise of setting frequency range Strengthen.
The quantity of resonance peak is corresponding with the quantity of resonant cavity, and the number of resonant cavity can be set according to the frequency range scope of noise Amount, to absorb the noise of more wide-band;Or the transmission loss in setting frequency range is superimposed.
In one example, as shown in Fig. 2 the first resonant cavity 11 and the second resonant cavity 12 are adjacent with the preceding operatic tunes 18, and First resonant cavity 11 and the second resonant cavity 12 are located at the sidepiece of the preceding operatic tunes 18.In this way, module casing is compacter, and And module casing is in integrally flat structure.So, the volume of loudspeaker module is reduced, electronic equipment has been complied with lightening, small The development trend of type.
There is provided a kind of electronic equipment according to another embodiment of the invention.Electronic equipment can be, but not limited to, Mobile phone, tablet personal computer, intelligent watch, game machine, notebook computer, intercom, earphone etc..The electronic equipment is carried including the present invention The loudspeaker module of confession.
The electronic equipment has noise small, the characteristics of sound effect is good.
Although some specific embodiments of the present invention are described in detail by example, the skill of this area Art personnel are it should be understood that example above is merely to illustrate, the scope being not intended to be limiting of the invention.The skill of this area Art personnel to above example it should be understood that can modify without departing from the scope and spirit of the present invention.This hair Bright scope is defined by the following claims.

Claims (10)

1. a kind of loudspeaker module, it is characterised in that including module casing and sound-producing device, be provided with the module casing Accommodating chamber and multiple resonant cavities, the sound-producing device are arranged in the accommodating chamber, and the sound-producing device is by the accommodating chamber It is divided into the preceding operatic tunes and the rear operatic tunes, the preceding operatic tunes is connected by sound mouth with exterior space;
Multiple resonant cavities are mutually isolated, before each resonant cavity is by respective communicating passage and the module casing The operatic tunes is connected.
2. loudspeaker module according to claim 1, it is characterised in that multiple resonant cavities include the first resonant cavity and Second resonant cavity, first resonant cavity and second resonant cavity are neighbour to be set, in first resonant cavity and the preceding sound The first communicating passage is provided between chamber, the second communicating passage is provided between second resonant cavity and the preceding operatic tunes.
3. loudspeaker module according to claim 2, it is characterised in that first resonant cavity and second resonant cavity With being set near the preceding operatic tunes, and first resonant cavity and second resonant cavity are located at the sidepiece of the preceding operatic tunes.
4. loudspeaker module according to claim 1, it is characterised in that the module casing includes upper casing, middle shell, bonnet And lower cover, the middle shell include side wall and the accommodating chamber vacancy section enclosed by the side wall and multiple resonant cavity hollow outs Area;
The upper casing covers the upper end in the accommodating chamber vacancy section and the multiple resonant cavity vacancy section, and the bonnet is covered Lower end in the accommodating chamber vacancy section, the lower cover covers the lower end in the multiple resonant cavity vacancy section, to be formed with enclosing The accommodating chamber and multiple resonant cavities;
The communicating passage for connecting each resonant cavity and the accommodating chamber is provided with the side wall.
5. loudspeaker module according to claim 4, it is characterised in that in the upper casing, the bonnet and the lower cover At least one linked together between the middle shell using ultra-sonic welded.
6. loudspeaker module according to claim 4, it is characterised in that the middle shell is integrated injection molding.
7. loudspeaker module according to claim 1, it is characterised in that the resonant cavity is the closed chamber being independently arranged Body.
8. loudspeaker module according to claim 1, it is characterised in that the resonant cavity be by a large cavity by every The small cavity that plate is isolated.
9. loudspeaker module according to claim 1, it is characterised in that the preceding operatic tunes is located at the side of the rear operatic tunes Portion.
10. a kind of electronic equipment, it is characterised in that including the loudspeaker module as described in any one in claim 1-9.
CN201710628026.4A 2017-07-28 2017-07-28 Loudspeaker module and electronic equipment Pending CN107318073A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201710628026.4A CN107318073A (en) 2017-07-28 2017-07-28 Loudspeaker module and electronic equipment
PCT/CN2017/102762 WO2019019325A1 (en) 2017-07-28 2017-09-21 Loudspeaker module and electronic apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710628026.4A CN107318073A (en) 2017-07-28 2017-07-28 Loudspeaker module and electronic equipment

Publications (1)

Publication Number Publication Date
CN107318073A true CN107318073A (en) 2017-11-03

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CN201710628026.4A Pending CN107318073A (en) 2017-07-28 2017-07-28 Loudspeaker module and electronic equipment

Country Status (2)

Country Link
CN (1) CN107318073A (en)
WO (1) WO2019019325A1 (en)

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CN108462929A (en) * 2018-05-17 2018-08-28 歌尔股份有限公司 Loud speaker module and electronic equipment
CN109874067A (en) * 2018-12-30 2019-06-11 瑞声科技(新加坡)有限公司 Loudspeaker enclosure
WO2019128437A1 (en) * 2017-12-25 2019-07-04 歌尔股份有限公司 Sounding device module
WO2019128438A1 (en) * 2017-12-25 2019-07-04 歌尔股份有限公司 Sound generating device module
WO2019205721A1 (en) * 2018-04-24 2019-10-31 歌尔股份有限公司 Sound emission device and electronic apparatus
WO2020125619A1 (en) * 2018-12-17 2020-06-25 歌尔股份有限公司 Acoustic device and electronic apparatus
WO2020228472A1 (en) * 2019-05-15 2020-11-19 维沃移动通信有限公司 Loudspeaker and terminal device
WO2020258787A1 (en) * 2019-06-27 2020-12-30 歌尔股份有限公司 Acoustic apparatus and electronic device
US11962969B2 (en) 2018-12-17 2024-04-16 Goertek Inc. Acoustic device and electronic apparatus

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Publication number Priority date Publication date Assignee Title
WO2019128438A1 (en) * 2017-12-25 2019-07-04 歌尔股份有限公司 Sound generating device module
WO2019128437A1 (en) * 2017-12-25 2019-07-04 歌尔股份有限公司 Sounding device module
WO2019205721A1 (en) * 2018-04-24 2019-10-31 歌尔股份有限公司 Sound emission device and electronic apparatus
CN108462929B (en) * 2018-05-17 2020-10-20 歌尔股份有限公司 Speaker module and electronic equipment
WO2019218667A1 (en) * 2018-05-17 2019-11-21 歌尔股份有限公司 Loudspeaker module and electronic device
CN108462929A (en) * 2018-05-17 2018-08-28 歌尔股份有限公司 Loud speaker module and electronic equipment
WO2020125619A1 (en) * 2018-12-17 2020-06-25 歌尔股份有限公司 Acoustic device and electronic apparatus
US11962969B2 (en) 2018-12-17 2024-04-16 Goertek Inc. Acoustic device and electronic apparatus
US11109159B2 (en) 2018-12-30 2021-08-31 AAC Technologies Pte. Ltd. Speaker box
WO2020140540A1 (en) * 2018-12-30 2020-07-09 瑞声声学科技(深圳)有限公司 Speaker box
CN109874067A (en) * 2018-12-30 2019-06-11 瑞声科技(新加坡)有限公司 Loudspeaker enclosure
AU2020276328B2 (en) * 2019-05-15 2023-04-27 Vivo Mobile Communication Co., Ltd. Loudspeaker and terminal device
JP2022532103A (en) * 2019-05-15 2022-07-13 維沃移動通信有限公司 Speakers and terminal equipment
JP7350889B2 (en) 2019-05-15 2023-09-26 維沃移動通信有限公司 Speakers and terminal equipment
US11924620B2 (en) 2019-05-15 2024-03-05 Vivo Mobile Communication Co., Ltd. Speaker and terminal device
WO2020228472A1 (en) * 2019-05-15 2020-11-19 维沃移动通信有限公司 Loudspeaker and terminal device
WO2020258787A1 (en) * 2019-06-27 2020-12-30 歌尔股份有限公司 Acoustic apparatus and electronic device

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Application publication date: 20171103