CN209105438U - Low frequency miniature moving-coil type loudspeaker - Google Patents
Low frequency miniature moving-coil type loudspeaker Download PDFInfo
- Publication number
- CN209105438U CN209105438U CN201822179615.1U CN201822179615U CN209105438U CN 209105438 U CN209105438 U CN 209105438U CN 201822179615 U CN201822179615 U CN 201822179615U CN 209105438 U CN209105438 U CN 209105438U
- Authority
- CN
- China
- Prior art keywords
- magnetic
- vibrating membrane
- annular magnet
- low frequency
- voice coil
- 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.)
- Expired - Fee Related
Links
- 239000012528 membrane Substances 0.000 claims abstract description 33
- 230000001681 protective effect Effects 0.000 claims description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910021389 graphene Inorganic materials 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 210000000613 ear canal Anatomy 0.000 abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 28
- 229910052742 iron Inorganic materials 0.000 description 14
- 230000035945 sensitivity Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 3
- 230000030214 innervation Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- DEGLFTVQHFLGRC-UHFFFAOYSA-N [B].[Fe].[Nd].[Fe] Chemical compound [B].[Fe].[Nd].[Fe] DEGLFTVQHFLGRC-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000004033 diameter control Methods 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
Abstract
The utility model provides a kind of low frequency miniature moving-coil type loudspeaker comprising shell, magnetic circuit unit and driving unit.Shell is cylindrical shape, consequently facilitating filling in ear canal；Magnetic circuit unit includes annular magnet and magnetic conductive part, and annular magnet is embedding in the shell, and magnetic conductive part constitutes magnetic field together with annular magnet.Driving unit includes vibrating membrane and voice coil, and the inner wall of vibrating membrane and shell connects, and one end of voice coil is deep into magnetic field, and the other end is connect with vibrating membrane.It is passed through electric current to voice coil, so that voice coil drives vibrating membrane vibration so that loudspeaker makes a sound under the influence of a magnetic field.Vibrating membrane and high-tension voice coil form softer driving unit by way of physical connection, to create prerequisite to provide more good low-frequency sound；Also, magnetic conductive part and annular magnet constitute excellent magnetic circuit system.Above-mentioned design enables moving-coil type magnet to provide good middle bass, and sound clarity is bright.
Description
Technical field
The utility model relates to stereo set fields, in particular to a kind of low frequency miniature moving-coil type loudspeaker.
Background technique
Under normal circumstances, In-Ear Headphones/hearing aid is all to be obtained using high performance dynamic iron loudspeaker unit preferably
Medium-high frequency, but dynamic iron loudspeaker unit, in addition to manufacturing process complexity, manufacturing cost is expensive, its main feature is that medium-high frequency performance is superior but low
Frequency is unsatisfactory always.
Utility model content
The purpose of this utility model is to provide a kind of low frequency miniature moving-coil type loudspeakers, are capable of providing more high-quality
Low-frequency sound.
The utility model is realized in this way:
A kind of low frequency miniature moving-coil type loudspeaker, including shell, magnetic circuit unit and driving unit,
The shell includes cylinder, and the cylinder includes first end and second end；
The magnetic circuit unit includes annular magnet and magnetic conductive part, and the annular magnet installation is in the housing, and described
Shell coaxial arrangement；
The magnetic conductive part includes to conducting magnetic column and magnetic conductive board, and an end face of the magnetic conductive board and the annular magnet is supported
It connects, the conducting magnetic column is connect with the magnetic guiding loop, and between protruding into the inner hole of the annular magnet and being formed the annular magnet
Gap；
The driving unit includes vibrating membrane and voice coil, and the edge of the vibrating membrane is connect with the inner wall of the shell；Institute
The one end for stating voice coil is connect with the vibrating membrane, and the other end is extend between annular magnet and the conducting magnetic column.
Further,
The magnetic circuit unit further includes magnetic guiding loop, the magnetic guiding loop and end face of the annular magnet far from the magnetic conductive board
Cooperation.
Further,
It further include protective cover, the protective cover is connect with the first end of the cylinder, and covers the vibrating membrane；It is described anti-
Protecting cover and the voice coil are located at the two sides of the vibrating membrane；Through-hole is provided on the protective cover.
Further,
It further include protective cover, the protective cover is connect with the first end of the cylinder, and is covered on the vibrating membrane；It is described
Through-hole is provided on protective cover.
Further,
The protective cover is stainless steel steel lid.
Further,
The shell further includes baffle, and the baffle is connect with the second end of the cylinder；The magnetic conductive board and the gear
Plate abuts.
Further,
It is provided with through-hole on the baffle, the magnetic conductive board and the conducting magnetic column, the baffle, the magnetic conductive board and leads
Through-hole in magnetic pole is mutually communicated.
Further,
It further include wiring board, the wiring board is fitted and connected with the baffle, and is electrically connected with the voice coil；The route
Through-hole is provided on plate.
Further,
The vibrating membrane is copper ring vibrating membrane.
Further,
The outer diameter of the voice coil is less than 2mm, and the voice coil uses line footpath in the high-tension copper wire of 0.02-0.03mm.
Further,
The diaphragm face is covered with one layer of graphene
The beneficial effects of the utility model are:
The low frequency miniature moving-coil type loudspeaker that the utility model obtains by above-mentioned design, vibrating membrane and high-tension voice coil
Softer driving unit is formed by way of physical connection, to create elder generation to provide more good low-frequency sound
Certainly condition；Also, magnetic conductive part and annular magnet constitute excellent magnetic circuit system.It is excellent that above-mentioned design enables moving-coil type magnet to provide
The middle bass of matter, sound clarity are bright.
Detailed description of the invention
It, below will be to required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
The attached drawing used is briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore not
It should be considered as the restriction to range, for those of ordinary skill in the art, without creative efforts,
It can also be obtained according to these attached drawings other relevant attached drawings.
Fig. 1 is the cross-sectional view of loudspeaker provided by the embodiment of the utility model；
Fig. 2 is 4.5mm moving-coil speaker provided in this embodiment and 4.0mm moving iron loud speaker part frequency response in the prior art
Curve comparison figure；
Fig. 3 is 4.0mm moving iron loud speaker part frequency response curve figure in the prior art.
Icon: 1- loudspeaker；2- shell；3- annular magnet；4- conducting magnetic column；5- magnetic conductive board；6- magnetic guiding loop；7- vibrating membrane；
8- voice coil；9- protective cover；10- baffle；11- wiring board.
Specific embodiment
It is practical below in conjunction with this to keep the purposes, technical schemes and advantages of the utility model embodiment clearer
The technical solution in the utility model embodiment is clearly and completely described in attached drawing in novel embodiment, shows
So, described embodiment is a part of embodiment of the utility model, rather than whole embodiments.It is practical based on this
Embodiment in novel, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment is fallen within the protection scope of the utility model.
Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit below and is wanted
The scope of the utility model of protection is sought, but is merely representative of the selected embodiment of the utility model.Based on the utility model
In embodiment, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Mode is fallen within the protection scope of the utility model.
In the description of the present invention, it should be understood that indicating position or the term of positional relationship are based on attached drawing
Shown in orientation or positional relationship, be merely for convenience of describing the present invention and simplifying the description, rather than indication or suggestion institute
The equipment or element of finger must have a particular orientation, is constructed and operated in a specific orientation, therefore should not be understood as to this reality
With novel limitation.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. terms shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be
Mechanical connection, is also possible to be electrically connected；It can be directly connected, two can also be can be indirectly connected through an intermediary
The interaction relationship of connection or two elements inside element.It for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term in the present invention.
It is in the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, or
The utility model product using when the orientation or positional relationship usually put, be merely for convenience of description the utility model and letter
Change description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation construct and
Operation, therefore should not be understood as limiting the present invention.In addition, term " first ", " second ", " third " etc. are only used for area
Divide description, is not understood to indicate or imply relative importance.
In addition, the terms such as term "horizontal", "vertical", " pendency " are not offered as requiring component abswolute level or pendency, and
It is that can be slightly tilted.It is not to indicate the structure if "horizontal" only refers to that its direction is more horizontal with respect to for "vertical"
It has to fully horizontally, but can be slightly tilted.
In the present invention unless specifically defined or limited otherwise, fisrt feature is on or below second feature
It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it
Between other characterisation contact.Moreover, fisrt feature is on second feature, top and above include fisrt feature the
Right above two features and oblique upper, or first feature horizontal height is merely representative of higher than second feature.Fisrt feature is in the second spy
Under sign, lower section and fisrt feature included below be directly below and diagonally below the second feature, or be merely representative of fisrt feature level
Height is less than second feature.
Embodiment:
Referring to FIG. 1, present embodiments providing a kind of low frequency miniature moving-coil type loudspeaker 1 comprising shell 2, magnetic circuit list
Member and driving unit.Shell 2 is cylindrical shape, consequently facilitating filling in ear canal；Magnetic circuit unit includes annular magnet 3 and magnetic conductive part, ring
For shape magnet 3 in shell 2, magnetic conductive part constitutes magnetic field with annular magnet 3 together.Driving unit includes vibrating membrane 7 and voice coil 8,
Vibrating membrane 7 is connect with the inner wall of shell 2, and one end of voice coil 8 is deep into magnetic field, and the other end is connect with vibrating membrane 7.To voice coil 8
It is passed through electric current, so that voice coil 8 drives the vibration of vibrating membrane 7 so that loudspeaker 1 makes a sound under the influence of a magnetic field.
Specifically, with continued reference to FIG. 1, the generally revolving body of shell 2, including cylinder interconnected and baffle 10；Circle
Cylinder includes first end and second end, and baffle 10 is connect with the second end of cylinder, and the middle part is provided with through-holes.Cylinder inner wall is close to
Stop collar is additionally provided at one end.
Magnetic circuit unit includes annular magnet 3 and magnetic conductive part, annular magnet 3 be arranged in shell 2 stop collar and baffle 10 it
Between, it is coaxially disposed with cylinder.Magnetic conductive part includes conducting magnetic column 4 and magnetic conductive board 5 interconnected, the longitudinal direction of conducting magnetic column 4 and magnetic conductive board 5
Section is T-type；Wherein magnetic conductive board 5 is arranged between baffle 10 and annular magnet 3, and conducting magnetic column 4 extend into the interior of annular magnet 3
Kong Zhong.In addition, magnetic circuit unit further includes magnetic guiding loop 6, magnetic guiding loop 6 is arranged between stop collar and annular magnet 3；6 He of magnetic guiding loop
Magnetic conductive board 5 cooperates with two end faces of annular magnet 3 respectively.In the present embodiment, above-mentioned annular magnet 3 uses neodymium-iron-boron
Iron；And the through-hole axially extending along conducting magnetic column 4 is provided on magnetic conductive board 5 and conducting magnetic column 4.
Driving unit includes vibrating membrane 7 and voice coil 8 interconnected, vibrating membrane 7 with a thickness of 0.02-0.05mm, material
Matter is softer, and the surface of vibrating membrane 7 is also covered with one layer of graphene carbon element, to ensure that the rigidity of vibrating membrane 7；So that
Vibrating membrane 7 is able to bear bigger operating voltage, is unlikely to deform or punctures.In addition, adjusting the stiffness and vibration of its vibrating membrane 7
The rigidity and quality of film 7 therefrom obtain more matched vibrating diaphragm elasticity modulus, optimize loudspeaker 1F0 (resonant frequency), to be promoted
Low Medium Frequency creates prerequisite.
Voice coil 8 uses high-tension copper wire, and wire diameter control ensure that driving unit is vibrating between 0.02mm-0.03mm
Service life in work, copper wire are not easily broken that voice coil 8 is avoided to fail.
Loudspeaker 1 provided in this embodiment further includes protecting cover, and protecting cover is embedded the first end in cylinder, for protecting vibrating membrane
7；Through-hole is provided on protecting cover, the outflow for sound.In addition, the outer surface of baffle 10 also sets up and is additionally provided with wiring board
11, the middle part of wiring board 11 is provided with through-hole.Through-hole on wiring board 11, baffle 10, magnetic conductive board 5 and conducting magnetic column 4 penetrates through.
2 outer diameter of shell of the microspeaker 1 is less than 4.5mm, can control by outer packing and is less than in outer diameter
5.5mm left and right.And the external auditory canal diameter of common people is about 7mm or so, so money microspeaker 1 can be placed in completely
In human body external auditory canal, increase the concealment and small sense of product appearance, while it is understood that the impression of acoustic low-pass is got over close to people
Body skin and human body non-sensitive part (external auditory canal) can be stronger, simultaneously as the sensitivity for being placed in loudspeaker 1 in external auditory canal is directed toward
In the self-evident complete set of point, the innervation of sound and the clarity of intermediate frequency also obtain perfect performance.The shell 2 and the mesoporous
An independent cavity is collectively formed in wiring board 11 and the magnetic circuit system B and driving unit A, by adjusting the mesoporous
We can obtain the sound quality requirement of different clients crowd to the mesh number of the mesoporous internal diameter of wiring board 11 and adjustable sound paper, to meet
The demand of all kinds of consumer groups.
The working principle of low frequency miniature moving-coil type loudspeaker 1 provided by the utility model is as follows:
Loudspeaker 1 is connect by wiring board 11 with external signal line, and signal wire provides corresponding signal electricity to loudspeaker 1
Stream；Wiring board 11 delivers current on voice coil 8, since the electric current on voice coil 8 is variation, voice coil 8 is received from magnetic
Field force is so as to of reciprocating vibration.The vibration of voice coil 8 drives vibrating membrane 7 to vibrate, to generate sound.
If magnetic circuit unit uses inner magnetic structure, when 8 internal diameter of voice coil is smaller, such as when between 1.2-2.2mm, interior magnetic knot
Magnet in structure is difficult to form, i.e., magnetic flux required by enabled molding microspeaker 1 is also much not achieved, and voice coil
8 are easy to bump against magnet and cause noise；And in the present embodiment, loudspeaker 1 is placed in voice coil 8 using high-performance ring shaped magnet 3
But this problem is readily solved among magnet.Increase annular magnetic conductive board 5 on annular magnet 3 simultaneously and increases among voice coil 8
Add a T iron conducting magnetic column 4, the magnetic energy product and coercivity of magnetic circuit unit is more effectively improved, to meet driving unit
Driving force.
2 outer diameter of shell of the microspeaker 1 is less than 4.5mm, can control by outer packing and is less than in outer diameter
5.5mm left and right.And the external auditory canal diameter of common people is about 7mm or so, so money microspeaker 1 can be placed in completely
In human body external auditory canal, increase the concealment and small sense of product appearance, at the same the impression of acoustic low-pass more close to human skin and
Human body non-sensitive part (external auditory canal) can it is stronger, simultaneously as be placed in loudspeaker 1 in external auditory canal sensitivity be directed toward point do not say and
It explains in complete set, the innervation of sound and the clarity of intermediate frequency also obtain perfect performance.The shell 2 and the mesoporous wiring board 11
An independent cavity is collectively formed with the magnetic circuit unit and the driving unit, by adjusting the mesoporous wiring board 11
We can obtain the sound quality requirement of different clients crowd to the mesh number of mesoporous internal diameter and adjustable sound paper, to meet all kinds of consumers
The demand of group.
Fig. 2 is 4.5mm moving-coil speaker 1 provided in this embodiment and the frequency of 1 part of 4.0mm moving iron loud speaker in the prior art
Ring curve comparison figure；Fig. 3 is 1 part frequency response curve figure of 4.0mm moving iron loud speaker in the prior art.
By Fig. 2 and Fig. 3 it is found that 1.) existing 4.0mm moving iron loud speaker 1F0 frequency is in 1000Hz, and in the present embodiment
The F0 frequency of 4.5mm moving-coil speaker 1 resonant frequency of moving-coil speaker 1 in 500Hz or so, the present embodiment reduces closely
500Hz；2.) existing 4.0mm moving iron loud speaker 120Hz to 3KHz is always it may be said that relatively more flat perseverance, high frequency points show 4.5KHz
Left and right, the sensitivity at the place 4.5KHz is close to 92db, it may be said that medium-high frequency performance is also possible, and sound relative performance relatively gives birth to
Firmly, consumption guest proper for doing the driving unit of hearing aid etc., being had damage suitable for some hearing；3.) and
The sensitivity in this region at 150Hz-2KHz of 4.5mm moving-coil speaker 1 is apparently higher than the nearly 5db or more of 4.0 moving iron loud speaker 1；
The obvious iron loudspeaker more dynamic than 4.0 of 4.5mm moving-coil speaker 1 have been decayed many at 3KHz-10kHz；4.) people can be placed in
Under conditions of in external ear canal, 4.5mm moving-coil speaker 1 is still substantially better than 4.0 moving iron loud speakers 1 in Low Medium Frequency sound, thorn
The sharp high frequency white noise of have sharp ears is also significantly lower than 4.0 moving iron loud speakers 1, obviously superior from the mildness and wear comfort of sound
In moving iron loud speaker 1；To bring better experience to more multi-level consumption guest.
The foregoing is merely the preferred embodiments in this present embodiment, are not limited in this present embodiment,
For those skilled in the art, there can be various modifications and variations in this present embodiment.It is all in this present embodiment
Within spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the protection model in this present embodiment
Within enclosing.
Claims (9)
1. a kind of low frequency miniature moving-coil type loudspeaker, which is characterized in that including shell, magnetic circuit unit and driving unit,
The shell includes cylinder, and the cylinder includes first end and second end；
The magnetic circuit unit includes annular magnet, magnetic conductive part and magnetic guiding loop, and the annular magnet is installed in the housing, with institute
State shell coaxial arrangement；The magnetic guiding loop and the annular magnet cooperate far from the end face of the magnetic conductive board；
The magnetic conductive part includes to conducting magnetic column and magnetic conductive board, and the magnetic conductive board is abutted with an end face of the annular magnet, institute
It states conducting magnetic column to connect with the magnetic guiding loop, and protrudes into the inner hole of the annular magnet and form gap with the annular magnet；
The driving unit includes vibrating membrane and voice coil, and the edge of the vibrating membrane is connect with the inner wall of the shell；The sound
One end of circle is connect with the vibrating membrane, and the other end is extend between annular magnet and the conducting magnetic column.
2. low frequency miniature moving-coil type loudspeaker according to claim 1, it is characterised in that:
It further include protective cover, the protective cover is connect with the first end of the cylinder, and covers the vibrating membrane；The protective cover
It is located at the two sides of the vibrating membrane with the voice coil；Through-hole is provided on the protective cover.
3. low frequency miniature moving-coil type loudspeaker according to claim 2, it is characterised in that: the protective cover is stainless steel steel
Lid.
4. low frequency miniature moving-coil type loudspeaker according to claim 1, it is characterised in that:
The shell further includes baffle, and the baffle is connect with the second end of the cylinder；The magnetic conductive board is supported with the baffle
It connects.
5. low frequency miniature moving-coil type loudspeaker according to claim 4, it is characterised in that: the baffle, the magnetic conductive board
With through-hole is provided on the conducting magnetic column, the through-hole on the baffle, the magnetic conductive board and conducting magnetic column is mutually communicated.
6. low frequency miniature moving-coil type loudspeaker according to claim 4, it is characterised in that: it further include wiring board, the line
Road plate is fitted and connected with the baffle, and is electrically connected with the voice coil；Through-hole is provided on the wiring board.
7. low frequency miniature moving-coil type loudspeaker according to claim 1, it is characterised in that: the vibrating membrane is copper ring vibration
Film.
8. low frequency miniature moving-coil type loudspeaker according to claim 1, it is characterised in that: the outer diameter of the voice coil is less than
2mm, the voice coil include high-tension copper wire of the line footpath in 0.02-0.03mm.
9. low frequency miniature moving-coil type loudspeaker according to claim 1, it is characterised in that: the diaphragm face is covered with
One layer of graphene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822179615.1U CN209105438U (en) | 2018-12-24 | 2018-12-24 | Low frequency miniature moving-coil type loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822179615.1U CN209105438U (en) | 2018-12-24 | 2018-12-24 | Low frequency miniature moving-coil type loudspeaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209105438U true CN209105438U (en) | 2019-07-12 |
Family
ID=67163292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822179615.1U Expired - Fee Related CN209105438U (en) | 2018-12-24 | 2018-12-24 | Low frequency miniature moving-coil type loudspeaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209105438U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021093696A1 (en) * | 2019-11-11 | 2021-05-20 | 希联电子香港有限公司 | Reverse miniature loudspeaker |
| CN113055795A (en) * | 2021-02-02 | 2021-06-29 | 歌尔股份有限公司 | Sound production device and earphone |
| WO2021253468A1 (en) * | 2020-06-18 | 2021-12-23 | 声电电子科技(惠州)有限公司 | Ultra-thin miniature loudspeaker |
-
2018
- 2018-12-24 CN CN201822179615.1U patent/CN209105438U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021093696A1 (en) * | 2019-11-11 | 2021-05-20 | 希联电子香港有限公司 | Reverse miniature loudspeaker |
| WO2021253468A1 (en) * | 2020-06-18 | 2021-12-23 | 声电电子科技(惠州)有限公司 | Ultra-thin miniature loudspeaker |
| CN113055795A (en) * | 2021-02-02 | 2021-06-29 | 歌尔股份有限公司 | Sound production device and earphone |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190712 |
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| CF01 | Termination of patent right due to non-payment of annual fee |