CN107172550A - Many driving Ultrathin speakers - Google Patents
Many driving Ultrathin speakers Download PDFInfo
- Publication number
- CN107172550A CN107172550A CN201710497257.6A CN201710497257A CN107172550A CN 107172550 A CN107172550 A CN 107172550A CN 201710497257 A CN201710497257 A CN 201710497257A CN 107172550 A CN107172550 A CN 107172550A
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- CN
- China
- Prior art keywords
- voice coil
- shell
- centring disk
- many driving
- ultrathin
- 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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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 238000005187 foaming Methods 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 description 10
- 230000004044 response Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 101001045744 Sus scrofa Hepatocyte nuclear factor 1-beta Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2400/00—Loudspeakers
- H04R2400/11—Aspects regarding the frame of loudspeaker transducers
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
The invention discloses drive Ultrathin speaker one kind more, the vibrating diaphragm and at least two separate driver elements being fixed together including shell, with cage connection, driver element includes voice coil unit and the magnetic circuit unit being correspondingly arranged with voice coil unit, include at least two mounting holes being arranged side by side on shell, magnetic circuit unit is correspondingly arranged in mounting hole, voice coil unit is also connected with being fixed with centring disk, one end of the remote voice coil unit of centring disk is fixed on shell, is provided with the side wall of shell and is gone out acoustic aperture for sound outgoing.Many driving Ultrathin speakers of the present invention, simple in construction, space availability ratio is high, effective radiating area is big and acoustical behavior is good.
Description
Technical field
The present invention relates to electroacoustic field, being specifically related to drive Ultrathin speaker one kind more.
Background technology
Along with the continuous progressive and innovation of technology, increasing consumption electronic product is gradually entered with different forms
The popular visual field, such as flat panel TV, its application is to have popularized.But it is frivolous to be due to that current electronic product has increasingly been towards
Change, miniaturization, the thickness of TV also thin down, although brought people's high definition and ultra-thin visual enjoyment, but
The simultaneously inevitable weaknessization that result in terms of tonequality, or even be not as full simple and honest as the tonequality of CRT electroacoustic, consumer is listening
Demand in terms of feel hardly results in satisfaction.Based on this, start to occur in that soundbar speaker products, the tonequality to flat panel TV has
Certain improvement result.
Undoubtedly, for the design of any a speaker products, the realization of its acoustic part be all it is vital,
And among these, loudspeaker just become the part being primarily upon.In the prior art, such product generally uses several circular monomers
Mechanical package is placed on casing, and the effective radiating area of product is very limited, and acoustical behavior is not ideal enough, and product chi
Very little, volume is all larger, occupies more cabinet space.The audio amplifier just allowed in voice frequency terminals such as similar flat panel TVs is broadcast
In place system, soundbar speaker products will be played an increasingly important role, and design of the application to horn module is provided
A kind of new thinking, to preferably solve the above problems.
The content of the invention
In view of the above-mentioned problems, the technical problems to be solved by the invention are：A kind of many driving Ultrathin speakers are provided, production is improved
The effective radiating area of product, the acoustical behavior more optimized using multipath magnetic circuit driving acquisition.
In order to solve the above problems, the technical scheme is that：
A kind of many driving Ultrathin speakers, including the vibrating diaphragm and at least two that shell and the cage connection are fixed together
Individual separate driver element；The driver element includes voice coil unit and the magnetic circuit being correspondingly arranged with the voice coil unit
Unit, wherein, at least two mounting holes being arranged side by side are included on the shell, the magnetic circuit unit is correspondingly arranged at the installation
Kong Zhong；The voice coil unit is also connected with being fixed with centring disk, and one end of the remote voice coil unit of the centring disk is consolidated
Determine on the housing；It is provided with the side wall of the shell and goes out acoustic aperture for sound outgoing.
As an improvement, the vibrating diaphragm is provided with one, is rectangle vibrating diaphragm, including the side being adhesively fixed with the shell
Edge and be arranged at the edge part inner side ring；The center of the vibrating diaphragm is combined with a flat top dome.
As an improvement, the top dome is foaming structure.
As an improvement, the top dome is PMI foaming structures or resin expanded structure.
As an improvement, the shell is to be provided with rectangular configuration, the major axis side wall of the shell described in electrical connection
The signal access terminal of the lead-out wire of voice coil loudspeaker voice coil；The centring disk is rectangular ring structure, in the short axle side of the centring disk
Set up the resigning portion cut；The lead-out wire of the voice coil loudspeaker voice coil is drawn by the resigning portion, and electrical with the terminal
Connection.
As an improvement, the driver element includes two voice coil units and corresponding with two voice coil units set
Two magnetic circuit units put；The voice coil unit includes the skeleton of voice coil loudspeaker voice coil and the support voice coil loudspeaker voice coil；The magnetic circuit unit design
For circle, including T iron and the magnet and washer that are set in the T iron periphery.
As an improvement, the centring disk includes the inward flange positioned at inner side, the outward flange positioned at outside and set
Linkage section between the inward flange and the outward flange；The outward flange is adhesively fixed with the shell, the inward flange
It is adhesively fixed with the outer surface of the skeleton.
As an improvement, the linkage section uniform intervals of the centring disk are set, and each linkage section is convex
The structure risen, and the height of projection all same of the linkage section.
As an improvement, it is described go out acoustic aperture be arranged on the major axis side wall of the shell, also, on the wall of each major axis side
It is provided with two and goes out acoustic aperture.
As an improvement, the operatic tunes before being formed between the side wall of the front space of the vibrating diaphragm and the shell；It is described to shake
Space between the side wall of the rear portion of film and the shell, the bottom wall of the shell forms the rear operatic tunes.
Employ after above-mentioned technical proposal, the beneficial effects of the invention are as follows：
Due to many driving Ultrathin speakers of the present invention, including at least two separate driver elements, its magnetic circuit
Unit correspondence is installed in the mounting hole on shell, and this structure design can maximally utilize the volume of product, while by
The driving force of multipath magnetic circuit, for existing structure design, its acoustical behavior can be more preferable.
Due to being connected with centring disk between voice coil unit and shell, centring disk can enter with the appearance and size of product
Row adaptability design, maximized offer product is pliable, lifting LF-response while, good centering can be played and made
With.Further, since being provided with to cut on the short-axis direction of centring disk to form resigning portion so that voice coil leads are easily drawn,
So when carrying out high power work, the amplitude of timely vibrational system is very big, and voice coil loudspeaker voice coil lead-out wire will not also get to other parts
On, prevent noise.
Due to many driving Ultrathin speakers of the present invention, multiple magnetic circuit units share a rectangle vibrating diaphragm and a tabular
Top dome, this flat top dome structure is capable of the acoustics of maximized utilization effective radiating area, further optimization product
Energy；Further, since top dome is designed as foaming structure, its density low weight is light and rigid good, both can guarantee that high sensitivity, again
So that product is not easy polarization, product frequency response response is good.
In summary, many driving Ultrathin speakers of the invention, can not only obtain bigger drive by the setting of multipath magnetic circuit
Power, while the radiating system of a large area is formd between vibrating diaphragm, centring disk and skeleton, it is good with reference to centring disk
Good certralizing ability, can provide more preferable tonequality for consumer.
Brief description of the drawings
Fig. 1 is the explosive view that Ultrathin speaker is driven the embodiment of the present invention more；
Fig. 2 is the sectional view that Ultrathin speaker is driven the embodiment of the present invention more.
Reference therein includes：1st, top dome, 2, vibrating diaphragm, 3, centring disk, 31, outward flange, 32, inward flange, 33, even
Connect section, 34, resigning portion, 4, voice coil unit, 41, voice coil loudspeaker voice coil, 411, lead-out wire, 42, skeleton, 5, shell, 6, washer, 7, magnet, 8, T
Iron, 9, signal access terminal, 10, go out acoustic aperture, 11, the preceding operatic tunes, 12, the rear operatic tunes.
Embodiment
With reference to the accompanying drawings and examples, the present invention is expanded on further.
Many driving Ultrathin speakers of the present invention are a kind of acoustical generator structures of many drivings, including at least two separate
Driver element, each driver element includes voice coil unit and the magnetic circuit list for cooperating and being correspondingly arranged with voice coil unit
Member.For convenience of description, described in detail below by taking the embodiment of two driver elements as an example.
Embodiment：
Common shown as shown in Figure 1, Figure 2, many driving Ultrathin speakers of present embodiment include two driver elements, i.e., including two
Individual voice coil unit 4 and two corresponding magnetic circuit units, wherein, voice coil unit 4 includes voice coil loudspeaker voice coil 41 and supports the skeleton 42 of voice coil loudspeaker voice coil,
Voice coil loudspeaker voice coil 41 is connected by skeleton 42 with vibration component (such as being connected with top dome 2).Vibration component includes a rectangle vibrating diaphragm 2
And combination, in the top dome 1 in the centre position of vibrating diaphragm 2, top dome 1 is designed as tabular.It should be noted that vibrating diaphragm 2 and ball herein
Top 1 is the structure of similar strip, and this structure design being capable of maximized utilization effective radiating area, further optimization production
The acoustical behavior of product.Vibrating diaphragm 2 includes the edge part being adhesively fixed with shell 5 and the ring being arranged on the inside of edge part, ring
It can be convex or recessed structure.
Magnetic circuit unit includes T iron 8, the magnet 7 and washer 6 that are sheathed on T iron 8, wherein, T iron 8 include circular base with
And from the stem of the middle part of base raised extension vertically upward, magnet 7 and washer 6 are disposed as circle, the equal perforate in middle part, and
The aperture of perforate should be more than the external diameter of the stem of T iron 8, and gap therebetween is the magnetic gap to form magnetic circuit system, voice coil loudspeaker voice coil 41
Lower end be placed in the magnetic gap.
For the ease of assembling, two mounting holes can be provided with shell 5 with spacing side by side, magnetic circuit unit correspondence is assemblied in every
At individual mounting hole, during implementation, outer casing bottom can be the design of hollow out or correspondence magnetic circuit is cut out in outer shell bottom wall
The part of size, mainly needs the size of the base of correspondence T iron 8.
Signal access terminal 9 is provided with shell 5 simultaneously, signal access terminal 9 can be shell fragment, pad or FPCB
Conducting structures such as (flexible print circuit boards), by taking shell fragment as an example, it can be with the integrated injection molding of shell 5, and moulding process is simple.
Common electric connection structure is：The lead-out wire 411 of voice coil loudspeaker voice coil adds terminal 9 with signal and electrically conducted, signal access terminal 9 and outside
Circuit turn-on, so inputs voice coil loudspeaker voice coil 41 by current signal, and voice coil loudspeaker voice coil 41 can do reciprocating cutting magnetic induction line in the presence of electromagnetic field
Motion, drives vibrating diaphragm 2 to vibrate by skeleton 42, and the sound wave that vibration is produced can be then radiated to by the acoustic aperture 10 that goes out on shell 5
It is extraneous.In present embodiment, go out acoustic aperture 10 and be opened on two major axis side walls of shell 5, and going out on the wall of each major axis side
Acoustic aperture can be provided with two or more, preferably equidistantly be evenly arranged, to cause sound wave to be more uniformly distributed to external radiation.When
So, for the technical program, the quantity for going out acoustic aperture 10 is not limited by two or more, and row are only illustrative herein
Lift, can be designed as one.
In addition, many driving Ultrathin speakers of present embodiment, its centring disk 3 can be carried out with the appearance and size of product
Design, rather than traditional circular design is used, in the present embodiment, centring disk 3 is designed to the profile of rectangle, can be with
Maximized offer product is pliable, lifting LF-response, while good certralizing ability can also be played.In traditional loudspeaker knot
In structure, voice coil loudspeaker voice coil lead-out wire 411 usually requires to draw between centring disk and top dome, but this lead-out mode is high-power in product
Lead-out wire is easy to get in other parts, the technical program and this part is also improved in the case of work, will
Cut on the short-axis direction of centring disk 3, so voice coil loudspeaker voice coil lead-out wire 411 can be made easily to be brought out, with signal
Access terminal 9 is turned on, and can specifically be will not be repeated here using modes such as welding conducting, conducting resinl bondings.
It has been observed that the centring disk 3 of present embodiment is really a ring with rectangular profile, including outward flange 31,
The linkage section 33 of inward flange 32 and connection outward flange 31 and inward flange 32, wherein, outward flange 31 and the side wall of shell 5 are bonded admittedly
It is scheduled on together, and together with inward flange 32 is then adhesively fixed with the lateral surface of skeleton 42, plays certralizing ability.It is not difficult to find out, it is fixed
Heart branch piece 3 is different from the centring disk structure in conventional horn structure, and its linkage section 33 is not the structure of a closure, but
Have disconnection, the gap be it is foregoing it is cropped fall part.Because centring disk 3 has the profile of rectangle, Ke Yiding
Adopted centring disk 3 includes two major axis and two short axles, can specifically be cut along the direction parallel to short axle, the portion cut
Divide i.e. as the resigning portion 34 drawn for lead-out wire 411.Sample is when carrying out high power work, and the amplitude of timely vibrational system is very
Greatly, voice coil loudspeaker voice coil lead-out wire will not be also got on other parts, prevent noise.
Linkage section 33 referred to herein includes some, and some uniform intervals of linkage section 33 are set, each connection
Section is the structure that raises up, and the height of projection all same of the linkage section.Certainly, the concrete structure of centring disk 3 is set
Meter can follow the profile and size of product to carry out the adjustment of adaptability, simply enumerate a kind of specific embodiment herein and
, it is not limited thereto.
It is preferred that, top dome 2 be foaming structure, can be specifically PMI foaming or resin expanded or foam material with
The combination of glass, plank etc., i.e. top dome 2 can be individual layer foaming structure or composite construction, and flat board top dome 2 is using hair
Bubble structure, its density low weight is light, and rigidity is good, both can guarantee that high sensitivity, can guarantee that product is not easy polarization, product frequency again
Response is good.
In the technical program, the operatic tunes 11 before the front space of centring disk 3 is formd, the back space shape of centring disk 3
Into the rear operatic tunes 12, specifically, the space between centring disk 3, skeleton 42, the side wall of vibrating diaphragm 2 and shell 5 forms the preceding operatic tunes
11, the space between centring disk 3, magnetic circuit unit and the side wall of shell 5 forms the rear operatic tunes 12, wherein, go out acoustic aperture 10 and preceding sound
It is interconnected between chamber 11, then the operatic tunes 12 then needs to be designed as acoustic seal, also, the preceding operatic tunes 11 and the rear operatic tunes 12
Between it is also mutually isolated.
Many driving Ultrathin speakers of the present invention, compared to existing technologies, it is applied to similar soundbar audio amplifiers
On product, it is thinner that size can be done, and is a kind of microphone device of long narrow, and utilizes multipath magnetic circuit+multitone ring+many centering branch
The structure of the flat board top dome of the vibrating diaphragm of piece+one+one, can maximally utilize product space, greatly improve the effective radiating area of product,
And help to improve the tonequality of product.
Case study on implementation of the present invention is these are only, is not intended to limit the invention, as long as those of ordinary skill in the art
The equivalent modification made according to disclosed content or change, should all include the protection domain described in claims
It is interior.
Claims (10)
1. a kind of many driving Ultrathin speakers, including the vibrating diaphragm and at least two that shell and the cage connection are fixed together
Separate driver element；The driver element includes voice coil unit and the magnetic circuit list being correspondingly arranged with the voice coil unit
Member, it is characterised in that：Include at least two mounting holes being arranged side by side on the shell, the magnetic circuit unit is correspondingly arranged at described
In mounting hole；The voice coil unit is fixedly connected with centring disk, one end of the remote voice coil unit of the centring disk
Fix on the housing；It is provided with the side wall of the shell and goes out acoustic aperture for sound outgoing.
2. many driving Ultrathin speakers according to claim 1, it is characterised in that：The vibrating diaphragm is provided with one, is rectangle
Vibrating diaphragm, including the edge part that is adhesively fixed with the shell and be arranged at the edge part inner side ring；The vibrating diaphragm
Center be combined with a flat top dome.
3. many driving Ultrathin speakers according to claim 2, it is characterised in that：The top dome is foaming structure.
4. many driving Ultrathin speakers according to claim 3, it is characterised in that：The top dome be PMI foaming structures or
Resin expanded structure.
5. many driving Ultrathin speakers according to claim 1, it is characterised in that：The shell is rectangular configuration, described outer
The signal access terminal for the lead-out wire for electrically connecting the voice coil loudspeaker voice coil is provided with the major axis side wall of shell；The centring disk is straight-flanked ring
Shape structure, is provided with the resigning portion cut on the short-axis direction of the centring disk；The lead-out wire of the voice coil loudspeaker voice coil is by institute
Resigning portion extraction is stated, and is electrically connected with the terminal.
6. many driving Ultrathin speakers according to claim 1, it is characterised in that：The driver element includes two voice coil loudspeaker voice coil lists
Member and two magnetic circuit units being correspondingly arranged with two voice coil units；The voice coil unit includes voice coil loudspeaker voice coil and support institute
State the skeleton of voice coil loudspeaker voice coil；The magnetic circuit unit is designed as circle, including T iron and the magnet and washer that are set in the T iron periphery.
7. many driving Ultrathin speakers according to claim 6, it is characterised in that：The centring disk is included positioned at inner side
Inward flange, the outward flange positioned at outside and the linkage section between the inward flange and the outward flange；The outward flange
It is adhesively fixed with the shell, the outer surface of the inward flange and the skeleton is adhesively fixed.
8. many driving Ultrathin speakers according to claim 7, it is characterised in that：Between the linkage section of the centring disk is uniform
Every setting, each linkage section is the structure raised up, and the height of projection all same of the linkage section.
9. many driving Ultrathin speakers according to claim 1, it is characterised in that：It is described go out acoustic aperture be arranged at the shell
On the wall of major axis side, also, it is provided with two on the wall of each major axis side and goes out acoustic aperture.
10. many driving Ultrathin speakers according to claim 9, it is characterised in that：The centring disk, the skeleton, institute
The space stated between vibrating diaphragm and the side wall of the shell forms the preceding operatic tunes；The centring disk, the magnetic circuit unit and described
Space between side wall of outer shell forms the rear operatic tunes；It is described go out acoustic aperture be connected with the preceding operatic tunes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710497257.6A CN107172550A (en) | 2017-06-26 | 2017-06-26 | Many driving Ultrathin speakers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710497257.6A CN107172550A (en) | 2017-06-26 | 2017-06-26 | Many driving Ultrathin speakers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107172550A true CN107172550A (en) | 2017-09-15 |
Family
ID=59826574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710497257.6A Pending CN107172550A (en) | 2017-06-26 | 2017-06-26 | Many driving Ultrathin speakers |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107172550A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020181889A1 (en) * | 2019-03-14 | 2020-09-17 | 歌尔股份有限公司 | Double-sided sound production apparatus and electronic device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101394683A (en) * | 2008-10-15 | 2009-03-25 | 瑞声声学科技(常州)有限公司 | Diaphragm for transducer |
| CN103269471A (en) * | 2013-05-08 | 2013-08-28 | 歌尔声学股份有限公司 | Flat plate type bass loudspeaker and electronic device where flat plate type bass loudspeaker is applied |
| WO2016176996A1 (en) * | 2015-05-06 | 2016-11-10 | 歌尔声学股份有限公司 | Loudspeaker module |
-
2017
- 2017-06-26 CN CN201710497257.6A patent/CN107172550A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101394683A (en) * | 2008-10-15 | 2009-03-25 | 瑞声声学科技(常州)有限公司 | Diaphragm for transducer |
| CN103269471A (en) * | 2013-05-08 | 2013-08-28 | 歌尔声学股份有限公司 | Flat plate type bass loudspeaker and electronic device where flat plate type bass loudspeaker is applied |
| WO2016176996A1 (en) * | 2015-05-06 | 2016-11-10 | 歌尔声学股份有限公司 | Loudspeaker module |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020181889A1 (en) * | 2019-03-14 | 2020-09-17 | 歌尔股份有限公司 | Double-sided sound production apparatus and electronic device |
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Effective date of registration: 20230306 Address after: 261031 Weian Road, Ligu community, Qingchi street, high tech Zone, Weifang City, Shandong Province Applicant after: Weifang geldanna Electronic Technology Co.,Ltd. Address before: 261031 No. 268 Dongfang Road, hi tech Industrial Development Zone, Shandong, Weifang Applicant before: GOERTEK DYNAUDIO Co.,Ltd. |