CN109511080A - A kind of earphone voice coil jig - Google Patents
A kind of earphone voice coil jig Download PDFInfo
- Publication number
- CN109511080A CN109511080A CN201811507328.7A CN201811507328A CN109511080A CN 109511080 A CN109511080 A CN 109511080A CN 201811507328 A CN201811507328 A CN 201811507328A CN 109511080 A CN109511080 A CN 109511080A
- Authority
- CN
- China
- Prior art keywords
- voice coil
- jig
- earphone
- slot
- mounting base
- 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
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
- H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2231/00—Details of apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor covered by H04R31/00, not provided for in its subgroups
- H04R2231/001—Moulding aspects of diaphragm or surround
Abstract
The invention discloses a kind of earphone voice coil jigs, A jig including strip, multiple mounting bases for being used to place voice coil are equidistantly equipped on the filling face of the A jig along its length, and corresponding each mounting base side is equipped with the voice coil line fixator for fixing voice coil line.Voice coil can be stably fixed on jig by the present invention by the A jig redesigned, and simultaneously in order to improve the assembly efficiency, while improve assembly precision, and the fixation position of voice coil the end of a thread can be limited by the voice coil line fixator being equipped with.
Description
Technical field
The present invention relates to earphone jig field, in particular to a kind of earphone voice coil jigs.
Background technique
Earphone (Earphones；Headphones；Head-sets；It Earpieces) is a pair of of converting unit, it receives matchmaker
The electric signal that body player or receiver are issued converts it into the sound wave that can be heard using the loudspeaker close to ear.
Earphone is usually separable with media player, and a plug is utilized to connect.Benefit be in the case where not influencing other people, can
Sound equipment is listened to alone；Also the sound that ambient enviroment can be separated is used under noisy environment of making an uproar in recording studio, DJ, journey, movement etc.
People it is helpful.Earphone original is used on phone and radio, but prevailing with portable electronic devices, and earphone is more
For mobile phone, walkman, radio, portable electronic game sum digit reproducing apparatus for phonotape etc..Moving coil earphone is most common, most common
Earphone, its driving unit is basically a small-sized moving-coil speaker, by the permanent magnetic field voice coil driving with
Connected diaphragm oscillations.Moving coil earphone efficiency is relatively high, can be mostly the earphone output driving on sound equipment, and reliable resistance to
With.Typically the diameter of driving unit is bigger, and the performance of earphone is outstanding, and driving unit is maximum in consumer level earphone at present
Diameter is 70mm, generally flagship grade circumaural earphone.
Existing moving-coil earphone mainly includes eight structures, is followed successively by shell, diaphragm, voice coil, pole piece, magnet, skeleton, end
Daughter board and sound equipment register, wherein vocal structure is the diaphragm for being bonded with voice coil, and when we use earphone, voice coil obtains electricity
Stream can be suspended in the permanent magnet of lower section, then be changed according to different audio signals electric current, thus front and back to form magnetic field
Movement, drives vibrating diaphragm, and vibrating diaphragm has then pushed the air in front, finally produced sound wave.Since moving-coil earphone is developed so far
Through comparative maturity, wherein comparatively permanent magnet and voice coil have been smaller to influence caused by sound quality.It is rather common at present
Permanent magnet be magnet steel and neodium magnet, wherein neodium magnet is to have now been found that the commercialization highest magnet of performance, is widely used in
In the headphone unit of located higher, the permanent magnet on unit generally be would be typically housed in forever at round or circular ring shape, voice coil
In toroidal cavity in magnet.
The manufacture craft of present moving-coil earphone is more mature, generallys use template and is assembled, includes on assembling line
Multiple steps successively assemble each structure according to step, are finally assembled into a complete moving-coil earphone.When most starting
Meeting machined diaphragm and voice coil, by the way that voice coil to be bonded in the suitable position of diaphragm, to reach optimal sense of hearing.But it is existing to add
In work process, the template of use is single fixed form, can not accomplish preferable locating effect when installing for coil, and
It and is to need just access the effect that is preferably adhesively fixed by the craft of consummate operation technician again.Then voice coil needs to protect
Conductor wire end is stayed, ending both ends are extended and is bonded on diaphragm outer ring, harness is relatively thin easily broken again for two conductor wire ends of the ending, if entirely
With positioning by hand, then not only efficiency is lower, but also machining accuracy is lower.
Summary of the invention
For above-mentioned problem in the prior art；The present invention provides a kind of earphone voice coil jig.
The present invention is achieved through the following technical solutions:
A kind of earphone voice coil jig, the A jig including strip are equidistant along its length on the filling face of the A jig
Equipped with multiple for placing the mounting base of voice coil, and corresponding each mounting base side is equipped with for fixing voice coil line
Voice coil line fixator.Mounting base is the through-hole structure through A jig, is equipped with and is fixed on mounting base inner wall in the mounting base
Columned voice coil seat.
One side end of filling face that voice coil seat is in the A jig is equipped with overall diameter and is less than or equal to consolidating for voice coil inner ring diameter
Determine ring, the voice coil is socketed on the outside of the fixed ring.The voice coil seat is columned pipeline configuration, and outer wall side is outside
It protrudes and is formed and connect the transverse arm being fixed with mounting base inner wall.One lateral edge of voice coil seat outer wall is parallel to voice coil seat axis
The shelves item in direction, the shelves item are equipped with the skewed slot for being used to guide limit voice coil line close to one side end of fixed ring.The skewed slot court
It is arranged to voice coil line fixator one end, and skewed slot width range is between 0.5-1mm.It is additionally provided on the filling face of the A jig
Wire casing corresponding with mounting base is fixed with voice coil line fixator in the wire casing.Voice coil line fixator includes fixing axle and socket
The double-deck cushion rubber in fixing axle, the voice coil line are passed through from the spaced slot of the double-deck cushion rubber and are limited.
The A jig and filling face opposite side are recessed inwardly to form stacking slot, by multiple A jig stacked on top
The stacking slot of the A jig on the top Shi Suoshu provides gap to the A jig of lower part to accommodate the voice coil of prominent mounting base.The A is controlled
The filling face both ends of tool are equipped with convex block, and the card slot for cooperating clamping limit with convex block is equipped on filling face opposite face；The convex block
Including cylindroid and straight cylinder；The card slot includes for accommodating and being clamped cylindroid A oval groove and for accommodating clamping directly
The A cylinder groove of cylinder.
Entire jig further includes the B jig for loading diaphragm；The A jig is oppositely buckled with B jig filling face to be made to apply
There is the demoulding Nian Jie with diaphragm of the voice coil of glue.Wherein, A jig and B jig are two kinds of strip gold for being used to load different structure
Belong to jig, generally monolith aluminium progress CNC processes to form integral structure.When processing, voice coil and diaphragm are finished products, and a large amount of
Be loaded in discharging device, at regular time and quantity to each jig be fed.And voice coil and diaphragm are first placed on correspondence on assembly line
Jig on, then the alignment of two jigs is fastened, the voice coil for being coated with glue and diaphragm being placed on corresponding position originally are just
Alignment bonding.Because of alignment back-off, can directly be fastened by the position location of script processing, not only efficiency is higher, but also precision
Control is preferable.It is worth noting that it is filling face that the A jig and B jig, which are used to place the one side of corresponding material,.
Further, the limit assembly that the clamping that cooperates limits is equipped on the A jig and B jig.The limit
Component can not only guide A jig and B jig to carry out back-off positioning, and be capable of providing preferable connective stability.Generally exist
When assembly, need by A jig and B jig back-off a period of time, so that glue can be bonded securely.If operator is careless at this time
It touches, because the limit assembly of setting can effectively provide preferable limit stablizing effect.
Further, the limit assembly includes the convex block and card slot being mutually clamped, and the jig filling face A is equipped with extremely
Few two convex blocks；The filling face of the B jig is equipped at least two card slots.
Further, the convex block being arranged on the same face includes cylindroid and straight cylinder；It is described to be arranged in the same face
On card slot include for accommodate and be clamped cylindroid A oval groove and for accommodate clamping straight cylinder A cylinder groove.
Further, the A jig is equipped at least two card slots in filling face opposite side face, and the card slot and opposite
Convex block shape cooperation on face.
Further, the card slot on the A jig on the same face include for accommodate and be clamped cylindroid B oval groove and
For accommodating the B cylinder groove of clamping straight cylinder.
Further, the filling face of the B jig is equipped with multiple diaphragm slots along linear systematic arrangement, the diaphragm slot
The central angles such as surrounding are provided at least three A circular holes.
Further, raised line, the voice coil slot setting are equipped with along B jig length direction on the filling face of the B jig
On raised line.
Further, the heavy platform to lower recess is equipped between the raised line long side and the B jig long side, wherein side institute
Heavy platform is stated equipped with dovetail groove corresponding with diaphragm slot.
Further, the B jig filling face opposite face is equipped with along B jig length direction and length is greater than the logical of raised line
Slot；The through slot of the B jig on the top provides gap to the B jig of lower part to put when by multiple described B jig stacked on top
Set the diaphragm of prominent diaphragm slot.
Further, it is equipped with annular projection in the voice coil slot, the annular projection and diaphragm trough rim form the between
One annular gap；It is recessed inwardly to form arc groove in the middle part of the annular projection, and is equipped in the arc groove the center point and runs through institute
State the B through-hole of B jig.
Compared with prior art, the present invention have the following advantages that and the utility model has the advantages that
The cooperation of two kinds of jigs provided by the invention improves assembly efficiency, by first putting voice coil and diaphragm on assembly line
It sets on corresponding jig, then fastens two jig alignment, the voice coil for being coated with glue being placed on corresponding position originally
Bonding is just aligned with diaphragm.Because of alignment back-off, can directly be fastened by the position location of script processing, not only efficiency is higher,
And precision controlling is preferable.
Voice coil can be stably fixed on jig by the present invention by the A jig redesigned, and simultaneously in order to improve
Assembly efficiency, while assembly precision is improved, the fixation position of voice coil the end of a thread can be limited by the voice coil line fixator being equipped with.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other features of the invention,
Objects and advantages will become apparent:
Shaft side figure when Fig. 1 is the filling face of A jig of the present invention；
Fig. 2 is the shaft side figure of the filling face opposite side of A jig of the present invention；
Fig. 3 is the planar structure schematic diagram in the filling face of A jig of the present invention；
Shaft side figure when Fig. 4 is the filling face of B jig of the present invention；
Fig. 5 is the shaft side figure of the filling face opposite side of B jig of the present invention；
Fig. 6 is the planar structure schematic diagram in the filling face of B jig of the present invention；
Fig. 7 is the enlarged diagram of the part A in Fig. 1 of the present invention.
In figure: 1-A jig, 2-B jig, 3- cylindroid, 4- straight cylinder, 5-A oval groove, 6-A cylinder groove, 7-B oval groove,
8-B cylinder groove, 9- diaphragm slot, 10-A circular hole, 11- raised line, 12- heavy platform, 13- dovetail groove, 14- through slot, 15- voice coil line are fixed
Device, 16- voice coil seat, 17- fixed ring, 18- transverse arm, 19- skewed slot, 20- wire casing.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It is also possible to be connected directly, is also possible to indirectly connected through an intermediary, it can
To be the connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood with concrete condition
Concrete meaning in the present invention.
Embodiment 1:
As shown in figs. 1-7, a kind of dress voice coil and diaphragm jig of the present embodiment, including 1 He of A jig for loading voice coil
For loading the B jig 2 of diaphragm；Wherein A jig is a kind of earphone voice coil jig.
The A jig 1 is oppositely buckled with the voice coil demoulding Nian Jie with diaphragm for making to be coated with glue with 2 filling face of B jig.Wherein, A
Jig 1 and B jig 2 are two kinds of elongated metal jigs for being used to load different structure, and generally monolith aluminium carries out CNC processing
Form integral structure.When processing, voice coil and diaphragm are finished products, and are largely loaded in discharging device, and giving at regular time and quantity is every
A jig feed.
And first voice coil and diaphragm are placed on corresponding jig on assembly line, then two jig alignment are fastened, it is former
Originally the voice coil for being coated with glue and diaphragm being placed on corresponding position are just aligned bonding.Because of alignment back-off, can be added by script
The position location of work directly fastens, and not only efficiency is higher, but also precision controlling is preferable.It is worth noting that the A jig 1 and B
It is filling face that jig 2, which is used to place the one side of corresponding material,.
The limit assembly for the clamping limit that cooperates is equipped on A jig 1 and B jig 2.The limit assembly can not only
Guidance A jig 1 and B jig 2 carry out back-off positioning, and are capable of providing preferable connective stability.Generally in assembly, need
By A jig 1 and the back-off a period of time of B jig 2, so that glue can be bonded securely.If operator touches accidentally at this time, because
Preferable limit stablizing effect can be effectively provided for the limit assembly of setting.
It is equidistantly equipped with along its length on the filling face of A jig 1 multiple for placing the mounting base of voice coil and corresponding each
The mounting base side is equipped with the voice coil line fixator 15 for fixing voice coil line.
Mounting base is the through-hole structure through A jig 1, is equipped with the cylinder being fixed on mounting base inner wall in the mounting base
The voice coil seat 16 of shape.One side end of filling face that the voice coil seat 16 is in the A jig 1 is equipped with overall diameter and is less than or equal to voice coil
The fixed ring 17 of inner ring diameter, the voice coil are socketed in 17 outside of fixed ring.The voice coil seat 16 is columned pipeline
Structure, outer wall side protrude outward and form the transverse arm 18 for connecting and being fixed with mounting base inner wall.
Limit assembly includes the convex block and card slot being mutually clamped, and the 1 filling face of A jig is equipped at least two convex blocks；
The filling face of the B jig 2 is equipped at least two card slots.The convex block being arranged on the same face includes cylindroid 3 and straight
Cylinder 4；The card slot being arranged on the same face includes A oval groove 5 for accommodating and being clamped cylindroid 3 and for accommodating card
Connect the A cylinder groove 6 of straight cylinder 4.
A jig 1 is equipped at least two card slots, and the convex block shape on the card slot and opposite face in filling face opposite side face
Shape cooperation.Card slot on the A jig 1 on the same face includes B oval groove 7 for accommodating and being clamped cylindroid 3 and for holding
Receive clamping straight cylinder 4 B cylinder groove 8.
The filling face of the B jig 2 is equipped with multiple diaphragm slots 9 along linear systematic arrangement, described 9 surrounding of diaphragm slot etc.
Central angle is provided at least three A circular holes 10.It is equipped with raised line 11 along 2 length direction of B jig on the filling face of the B jig 2,
The voice coil slot is arranged on raised line 11.
The heavy platform 12 to lower recess is equipped between 11 long side of raised line and 2 long side of B jig, wherein heavy platform 12 described in side
It is equipped with dovetail groove 13 corresponding with diaphragm slot 9.The B jig 2 load face opposite face be equipped with along 2 length direction of B jig and
Length is greater than the through slot 14 of raised line 11；The through slot 14 of the B jig 2 on the top is given when by multiple described B 2 stacked on top of jig
The B jig 2 of lower part provides gap to place the diaphragm of prominent diaphragm slot 9.
Annular projection is equipped in voice coil slot, the annular projection and diaphragm slot form the first annular gap between 9 edge；Institute
It states and is recessed inwardly to form arc groove in the middle part of annular projection, and be equipped in the arc groove the center point and lead to through the B of the B jig 2
Hole.
16 outer wall of voice coil seat, one lateral edge is parallel to the shelves item of 16 axis direction of voice coil seat, and the shelves item is close to fixed ring 17 1
Side end is equipped with the skewed slot 19 for being used to guide limit voice coil line.The skewed slot 19 is arranged towards 15 one end of voice coil line fixator, and
19 width range of skewed slot is between 0.5-1mm.
It is additionally provided with wire casing 20 corresponding with mounting base on the filling face of A jig 1, it is solid that voice coil line is fixed in the wire casing 20
Determine device 15.The voice coil line fixator 15 includes fixing axle and the double-deck cushion rubber that is socketed in fixing axle, and the voice coil line is from double
It passes through and is limited in the spaced slot of layer cushion rubber.
A jig 1 and filling face opposite side are recessed inwardly to form stacking slot, when by multiple described A 1 stacked on top of jig
The stacking slot of the A jig 1 on the top provides gap to the A jig 1 of lower part to accommodate the voice coil of prominent mounting base.The A is controlled
The filling face both ends of tool 1 are equipped with convex block, and the card slot for cooperating clamping limit with convex block is equipped on filling face opposite face；The convex block
Including cylindroid 3 and straight cylinder 4；The card slot includes A oval groove 5 for accommodating and being clamped cylindroid 3 and for accommodating card
Connect the A cylinder groove 6 of straight cylinder 4.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: not
A variety of change, modification, replacement and modification can be carried out to these embodiments by being detached under the principle of the present invention and objective, of the invention
Range is defined by the claims and their equivalents.
Claims (10)
1. a kind of earphone voice coil jig, it is characterised in that: the A jig (1) including strip, on the filling face of the A jig (1)
Equidistantly be equipped with along its length it is multiple for placing the mounting bases of voice coil, and corresponding each mounting base side be all provided with it is useful
To fix the voice coil line fixator (15) of voice coil line.
2. a kind of earphone voice coil jig according to claim 1, it is characterised in that: the mounting base is through A jig (1)
Through-hole structure, the columned voice coil seat (16) being fixed on mounting base inner wall is equipped in the mounting base.
3. a kind of earphone voice coil jig according to claim 2, it is characterised in that: the voice coil seat (16) is in the A
Filling one side end of face of jig (1) is equipped with the fixed ring (17) that overall diameter is less than or equal to voice coil inner ring diameter, the voice coil set
It connects on the outside of the fixed ring (17).
4. a kind of earphone voice coil jig according to claim 2 or 3, it is characterised in that: the voice coil seat (16) is cylinder
The pipeline configuration of shape, outer wall side protrude outward and form the transverse arm (18) for connecting and being fixed with mounting base inner wall.
5. a kind of earphone voice coil jig according to claim 4, it is characterised in that: one lateral edge of voice coil seat (3) outer wall
It is parallel to the shelves item of voice coil seat (16) axis direction, the shelves item is equipped with close to (4) one side end of fixed ring to be used to guide limit
The skewed slot (19) of voice coil line.
6. a kind of earphone voice coil jig according to claim 5, it is characterised in that: the skewed slot (6) is solid towards voice coil line
Determine the setting of device (15) one end, and skewed slot (19) width range is between 0.5-1mm.
7. a kind of earphone voice coil jig according to claim 2 or 3, it is characterised in that: the filling face of the A jig (1)
On be additionally provided with wire casing (20) corresponding with mounting base (16), is fixed with voice coil line fixator (15) in the wire casing (20).
8. a kind of earphone voice coil jig according to claim 2 or 3, it is characterised in that: voice coil line fixator (2) packet
The double-deck cushion rubber for including fixing axle and being socketed in fixing axle, the voice coil line are passed through from the spaced slot of the double-deck cushion rubber and are limited
Position.
9. a kind of earphone voice coil jig according to claim 1-3, it is characterised in that: the A jig (1) and dress
The face opposite side of filling out is recessed inwardly to form stacking slot, the A jig on top when by multiple described A jig (1) stacked on top
(1) stacking slot provides gap to the A jig (1) of lower part to accommodate the voice coil of prominent mounting base.
10. a kind of earphone voice coil jig according to claim 9, it is characterised in that: the filling face two of the A jig (1)
End is equipped with convex block, and the card slot for cooperating clamping limit with convex block is equipped on filling face opposite face；The convex block include cylindroid and
Straight cylinder；The card slot includes the A cylinder for accommodating and being clamped cylindroid A oval groove and for accommodating clamping straight cylinder
Slot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811507328.7A CN109511080A (en) | 2018-12-11 | 2018-12-11 | A kind of earphone voice coil jig |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811507328.7A CN109511080A (en) | 2018-12-11 | 2018-12-11 | A kind of earphone voice coil jig |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109511080A true CN109511080A (en) | 2019-03-22 |
Family
ID=65752044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811507328.7A Pending CN109511080A (en) | 2018-12-11 | 2018-12-11 | A kind of earphone voice coil jig |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109511080A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021056477A1 (en) * | 2019-09-27 | 2021-04-01 | 赣州鑫冠科技股份有限公司 | High-fidelity headphone loudspeaker sound film assembly jig |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012151707A (en) * | 2011-01-20 | 2012-08-09 | Audio Technica Corp | Method of manufacturing dynamic microphone unit |
| CN205071313U (en) * | 2015-11-13 | 2016-03-02 | 重庆夏朗科技有限公司 | Sound membrane and coil combination tool |
| CN206353860U (en) * | 2016-12-16 | 2017-07-25 | 中山市天键通讯技术有限公司 | The automatic mould-entering device of earphone diaphragm |
| CN206629275U (en) * | 2017-01-26 | 2017-11-10 | 厦门冠音泰科技有限公司 | A kind of assembly fixture for Microspeaker |
| CN207399515U (en) * | 2017-10-18 | 2018-05-22 | 中山市天键通讯技术有限公司 | Earphone automatic assembling auxiliary fixture |
-
2018
- 2018-12-11 CN CN201811507328.7A patent/CN109511080A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012151707A (en) * | 2011-01-20 | 2012-08-09 | Audio Technica Corp | Method of manufacturing dynamic microphone unit |
| CN205071313U (en) * | 2015-11-13 | 2016-03-02 | 重庆夏朗科技有限公司 | Sound membrane and coil combination tool |
| CN206353860U (en) * | 2016-12-16 | 2017-07-25 | 中山市天键通讯技术有限公司 | The automatic mould-entering device of earphone diaphragm |
| CN206629275U (en) * | 2017-01-26 | 2017-11-10 | 厦门冠音泰科技有限公司 | A kind of assembly fixture for Microspeaker |
| CN207399515U (en) * | 2017-10-18 | 2018-05-22 | 中山市天键通讯技术有限公司 | Earphone automatic assembling auxiliary fixture |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021056477A1 (en) * | 2019-09-27 | 2021-04-01 | 赣州鑫冠科技股份有限公司 | High-fidelity headphone loudspeaker sound film assembly jig |
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Application publication date: 20190322 |
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