CN104602168A - Micro loudspeaker module and design method thereof - Google Patents
Micro loudspeaker module and design method thereof Download PDFInfo
- Publication number
- CN104602168A CN104602168A CN201410849782.6A CN201410849782A CN104602168A CN 104602168 A CN104602168 A CN 104602168A CN 201410849782 A CN201410849782 A CN 201410849782A CN 104602168 A CN104602168 A CN 104602168A
- Authority
- CN
- China
- Prior art keywords
- perforate
- back cavity
- mesochite
- microspeaker module
- module
- 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.)
- Granted
Links
Abstract
The invention discloses a micro loudspeaker module and a design method thereof. The module comprises an upper casing, a vibration system, a middle casing, a magnetic circuit system and a lower casing from the top to the bottom successively. The vibration system is arranged in the middle casing and is in seamless connection with the middle casing, a front cavity and a rear cavity of the middle casing are isolated completely through the upper casing, and preset-shape holes are formed in the wall of the rear cavity, so that the rear cavity and the outside can form gas exchange during the vibration of the vibration system. By means of the module and the design method, the preset-shape holes are formed in the wall of the rear cavity of the middle casing, the rear cavity and the outside can form gas exchange by the aid of the holes, and accordingly, large enough gas exchange space is provided, the design requirement of the micro loudspeaker module is guaranteed, and the problem that design space for the micro loudspeaker module become smaller and smaller and cannot meet the micro loudspeaker module design requirement in the prior art is solved.
Description
Technical field
The present invention relates to field of mobile communication, particularly relate to a kind of Microspeaker module and method for designing thereof.
Background technology
The loudspeaker module of current mobile phone adopts the design of band back cavity, and back cavity is substantially from 0.5cm
3to 1.5cm
3not etc.The structure of usual loudspeaker module is comparatively large, and its back cavity also correspondence is larger.
But because mobile phone just thins down, functional module gets more and more, the space leaving audio horn module for is fewer and feweri, is difficult to meet to electro-acoustic element 1cm
3instructions for use.But for existing Microspeaker module, often occur being less than 0.3cm
3situation.
Summary of the invention
The invention provides a kind of Microspeaker module and method for designing thereof, at least to solve in prior art, the design space leaving Microspeaker module for is more and more less, cannot meet the problem of Microspeaker module design demand.
On the one hand, the invention provides a kind of Microspeaker module, comprise successively from top to bottom: upper casing, vibrational system, mesochite, magnetic circuit system, lower casing; Wherein, described vibrational system is arranged on mesochite, described vibrational system and described mesochite seamless link, and by described upper casing by the ante-chamber on described mesochite and back cavity completely isolated, the chamber wall of described back cavity is provided with the perforate of reservation shape, to ensure in the process vibrated in described vibrational system that back cavity can form gas exchanges with the external world.
Further, gas channel is provided with bottom the mesochite that chamber is corresponding in the rear, described gas channel is communicated with the place's perforate of magnetic cylinder and the perforate of mesochite place of described vibrational system, with in the process vibrated in described vibrational system, described back cavity is carried out gas exchanges by described gas channel and described perforate and the external world.
Further, one end of described gas channel is arranged on the chamber wall of described back cavity, and the other end of described gas channel is arranged on four angles of described magnetic circuit system.
Further, the perforate of described back cavity wall is provided with screen cloth, wherein, the gas permeability that described screen cloth has and damping and amortization.
Further, the quantity of described perforate is four or more.
On the other hand, present invention also offers a kind of method for designing of Microspeaker module, for designing the Microspeaker module of above-mentioned any one, comprise: the preset audio characteristic determining Microspeaker module, wherein, described acoustic characteristic at least comprises one of following: resonance frequency F0, frequency response curve Q value; The number of openings of perforate on adjustment mesochite back cavity wall and the perforate gross area, meet described preset audio characteristic to make described Microspeaker module.
Further, described method also comprises: when being provided with screen cloth in described perforate, adjusts the percent opening of described screen cloth and the acoustic resistance of screen cloth, meets described preset audio characteristic to make described Microspeaker module.
Further, described acoustic characteristic at least comprises one of following: resonance frequency F0, frequency response curve Q value.
The present invention has the perforate of reservation shape on the chamber wall of Microspeaker module mesochite back cavity, ensure that back cavity can form gas exchanges with the external world by this perforate, enough large gas exchanges space is provided, when less design space, ensure that the design requirement of Microspeaker module, solve in prior art, the design space leaving Microspeaker module for is more and more less, cannot meet the problem of Microspeaker module design demand.
Accompanying drawing explanation
By reading hereafter detailed description of the preferred embodiment, various other advantage and benefit will become cheer and bright for those of ordinary skill in the art.Accompanying drawing only for illustrating the object of preferred implementation, and does not think limitation of the present invention.And in whole accompanying drawing, represent identical parts by identical reference symbol.In the accompanying drawings:
Fig. 1 is Microspeaker module decomposing schematic representation in the embodiment of the present invention;
Fig. 2 is the rearview of the Microspeaker module perforate after being stained with screen cloth in the embodiment of the present invention;
Fig. 3 is the profile that the Microspeaker module after being stained with screen cloth in the embodiment of the present invention is observed from inside;
Fig. 4 is the schematic diagram be bonded in by screen cloth in the embodiment of the present invention in perforate;
Fig. 5 is the Microspeaker module mesochite schematic diagram being provided with gas channel in the embodiment of the present invention;
Fig. 6 is the schematic diagram that in the perforate of back cavity in the embodiment of the present invention and gas channel reciprocal process, air-flow outwards flows to;
Fig. 7 is the mesochite ante-chamber schematic diagram of three dimensional form in the embodiment of the present invention;
Fig. 8 is the mesochite back cavity schematic diagram of three dimensional form in the embodiment of the present invention;
Fig. 9 is the decomposing schematic representation of the Microspeaker module complete machine in the embodiment of the present invention with screen cloth;
Figure 10 is the schematic diagram of the Microspeaker module complete machine in the embodiment of the present invention with screen cloth;
Figure 11 is simple change Q value frequency response curve analogous diagram in the embodiment of the present invention;
Figure 12 is simple change Q value impedance curve analogous diagram in the embodiment of the present invention;
Figure 13 is simple change back cavity equivalent volume frequency response curve analogous diagram in the embodiment of the present invention;
Figure 14 is simple change back cavity equivalent volume impedance curve analogous diagram in the embodiment of the present invention;
Figure 15 changes back cavity equivalent volume and Q value frequency response curve analogous diagram simultaneously in the embodiment of the present invention;
Figure 16 changes back cavity equivalent volume and Q value impedance curve analogous diagram simultaneously in the embodiment of the present invention.
Embodiment
Below with reference to accompanying drawings exemplary embodiment of the present disclosure is described in more detail.Although show exemplary embodiment of the present disclosure in accompanying drawing, however should be appreciated that can realize the disclosure in a variety of manners and not should limit by the embodiment set forth here.On the contrary, provide these embodiments to be in order to more thoroughly the disclosure can be understood, and complete for the scope of the present disclosure can be conveyed to those skilled in the art.
In order to solve in prior art, the design space leaving Microspeaker module for is more and more less, cannot meet the problem of Microspeaker module design demand, the invention provides a kind of Microspeaker module and method for designing thereof, below in conjunction with accompanying drawing and embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, do not limit the present invention.
Embodiments provide a kind of Microspeaker module, its exploded pictorial as shown in Figure 1, comprises from top to bottom successively:
Upper casing, vibrational system, mesochite, magnetic circuit system, lower casing; Wherein, vibrational system is arranged on mesochite, vibrational system and mesochite seamless link, and by described upper casing by the ante-chamber on described mesochite and back cavity completely isolated, (in figure, exploded view is left front view the chamber wall of back cavity to be provided with the perforate of reservation shape, fail completely perforate to be shown), to ensure in the process vibrated in vibrational system that back cavity can form gas exchanges with the external world.
The embodiment of the present invention has the perforate of reservation shape on the chamber wall of Microspeaker module mesochite back cavity, ensure that back cavity can form gas exchanges with the external world by this perforate, enough large gas exchanges space is provided, when less design space, ensure that the design requirement of Microspeaker module, solve in prior art, the design space leaving Microspeaker module for is more and more less, cannot meet the problem of Microspeaker module design demand.
During design, the quantity of perforate on the wall of back cavity chamber can be designed according to demand, such as two, four or five etc., during design, should be noted that the number of openings, if perforate is too much, the hardness of back cavity may be caused to reduce, if perforate very little, perforate may be caused too large, be not easy to meet design requirement, therefore, screen cloth can be provided with in the perforate of back cavity wall, be stained with the backsight of the Microspeaker module perforate after screen cloth as shown in Figure 2, from inside observe section as shown in Figure 3, wherein, the gas permeability that screen cloth has and damping and amortization.Fig. 4 shows the schematic diagram be bonded in by screen cloth in above-mentioned perforate.
In the process realized, as shown in Figure 5, gas channel is provided with bottom the mesochite that back cavity is corresponding, gas channel is communicated with the place's perforate of magnetic cylinder and the perforate of mesochite place of vibrational system, with in the process vibrated in vibrational system, back cavity is carried out gas exchanges by gas channel and perforate and the external world, and one end of gas channel is arranged on the chamber wall of back cavity, and the other end of gas channel is arranged on four angles of magnetic circuit system.Fig. 6 shows the schematic diagram that in the perforate of back cavity and gas channel reciprocal process, air-flow outwards flows to, it draws when vibrational system is taken exercises, air-flow trend when back cavity moves downward, when back cavity moves upward, those skilled in the art know, and air-flow can flow along the opposite direction of arrow in Fig. 6.Fig. 7 gives the mesochite ante-chamber schematic diagram of three dimensional form, Fig. 8 gives the mesochite back cavity schematic diagram of three dimensional form, those skilled in the art can find out, in the gas channel that back cavity is arranged, gas channel has perforate (to merely illustrate middle shell structure in Fig. 8 at four angles place of magnetic circuit system, other parts not shown), air-flow flows along the direction of the arrow in Fig..Fig. 9 gives the decomposing schematic representation of the Microspeaker module complete machine with screen cloth, and Figure 10 gives the schematic diagram of the Microspeaker module complete machine with screen cloth, there is shown ante-chamber sender.
Microspeaker module in the embodiment of the present invention, substantially reduce the volume of loud speaker itself, solve due to the too little problem that cannot load Microspeaker module of the equipment headspaces such as mobile phone, when loudspeaker module back cavity is very little, in back cavity perforate, carry out gas exchanges by screen cloth and the external world, solve loudspeaker module back cavity too little, resonance frequency F0 is too high, the problem that tonequality is not good.
Because current phone is more and more slim, loudspeaker module is difficult to meet Microspeaker back cavity 1mm
3demand.The embodiment of the present invention additionally provides a kind of method for designing of Microspeaker module, for designing above-mentioned any one Microspeaker module, comprise following process: the preset audio characteristic determining Microspeaker module, wherein, acoustic characteristic at least comprises one of following: resonance frequency F0, frequency response curve Q value; The number of openings of perforate on adjustment mesochite back cavity wall and the perforate gross area, meet preset audio characteristic to make Microspeaker module.
When realizing, if the perforate of back cavity chamber wall is stained with screen cloth, then when designing, also needing the adjustment percent opening of screen cloth and the acoustic resistance of screen cloth, meeting preset audio characteristic to make Microspeaker module.Wherein, acoustic characteristic at least comprises one of following: resonance frequency F0, frequency response curve Q value.
The method that loudspeaker module chamber without issue (back cavity perforate) is designed solves the problem that current loudspeaker module back cavity size can not meet design requirement, and by regulating screen cloth parameter, reaches flexibly, dynamically controls the object of equivalent back cavity size and Q value.
The adjustment percent opening of screen cloth and the acoustic resistance of screen cloth, the number of openings of perforate on adjustment mesochite back cavity wall and the perforate gross area, namely change back cavity equivalent volume and back cavity equiva lent impedance, can adjust resonance frequency F0, frequency response curve Q value.Below in conjunction with accompanying drawing and instantiation, above-mentioned Microspeaker module and its method for designing are further illustrated.
(1) simple change Q value design sketch.
1, frequency response curve is as shown in figure 11, and 1KHz place is seen, from top to bottom back cavity equiva lent impedance be respectively 5e7,8e7,1/2e8,3e8.
2, impedance curve as shown in figure 12, and 1KHz place is seen, from top to bottom, changes back cavity equiva lent impedance and be respectively 3e8 Ω, 1e8 Ω, 1/2e8 Ω, 8e7 Ω, 5e7 Ω.
(2) simple change back cavity equivalent volume design sketch.
1, frequency response curve as shown in figure 13, and 500Hz place is seen, from top to bottom, changes back cavity equivalent volume and be respectively 1cm
3, 0.8cm
3, 0.6cm
3, 0.4cm
3, 0.2cm
3.
2, impedance curve as shown in figure 14, and 500Hz place is seen, from top to bottom, changes back cavity equivalent volume and be respectively 1cm
3, 0.8cm
3, 0.6cm
3, 0.4cm
3, 0.2cm
3.
(3) change back cavity equivalent volume and Q value design sketch simultaneously.
1, frequency response curve as shown in figure 15, viewed from 800Hz, from top to bottom, changes back cavity equivalent volume simultaneously and be respectively 1cm
3, 0.8cm
3, 0.6cm
3, 0.4cm
3, 0.2cm
3, back cavity equiva lent impedance is respectively 3e8 Ω, 1e8 Ω, 1/2e8 Ω, 8e7 Ω, 5e7 Ω.
2, impedance curve as shown in figure 16, and viewed from 800Hz, from top to bottom, back cavity equivalent volume is respectively 1cm simultaneously
3, 0.8cm
3, 0.6cm
3, 0.4cm
3, 0.2cm
3, back cavity equiva lent impedance is respectively 3e8 Ω, 1e8 Ω, 1/2e8 Ω, 8e7 Ω, 5e7 Ω.
Those skilled in the art can find out from a large amount of emulated data, the cavity low-frequency resonant point of this structural member can reach 920Hz, and sensitivity can reach 91dB, and high-frequency cut-off frequency can reach 4KHz, medium-high frequency distortion is less than 8%, meets the basic index requirement of mobile phone to loudspeaker cavity.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (8)
1. a Microspeaker module, is characterized in that, comprises successively from top to bottom:
Upper casing, vibrational system, mesochite, magnetic circuit system, lower casing;
Wherein, described vibrational system is arranged on mesochite, described vibrational system and described mesochite seamless link, and by described upper casing by the ante-chamber on described mesochite and back cavity completely isolated, the chamber wall of described back cavity is provided with the perforate of reservation shape, to ensure in the process vibrated in described vibrational system that back cavity can form gas exchanges with the external world.
2. Microspeaker module as claimed in claim 1, is characterized in that,
Gas channel is provided with bottom the mesochite that chamber is corresponding in the rear, described gas channel is communicated with the place's perforate of magnetic cylinder and the perforate of mesochite place of described vibrational system, with in the process vibrated in described vibrational system, described back cavity is carried out gas exchanges by described gas channel and described perforate and the external world.
3. Microspeaker module as claimed in claim 2, it is characterized in that, one end of described gas channel is arranged on the chamber wall of described back cavity, and the other end of described gas channel is arranged on four angles of described magnetic circuit system.
4. Microspeaker module as claimed any one in claims 1 to 3, is characterized in that, the perforate of described back cavity wall is provided with screen cloth, wherein, and the gas permeability that described screen cloth has and damping and amortization.
5. Microspeaker module as claimed in claim 4, it is characterized in that, the quantity of described perforate is four or more.
6. a method for designing for Microspeaker module, for designing the Microspeaker module according to any one of claim 1 to 5, is characterized in that, comprise:
Determine the preset audio characteristic of Microspeaker module, wherein, described acoustic characteristic at least comprises one of following: resonance frequency F0, frequency response curve Q value;
The number of openings of perforate on adjustment mesochite back cavity wall and the perforate gross area, meet described preset audio characteristic to make described Microspeaker module.
7. method for designing as claimed in claim 6, is characterized in that, also comprise:
Described perforate is provided with screen cloth, adjust the percent opening of described screen cloth and the acoustic resistance of screen cloth, meet described preset audio characteristic to make described Microspeaker module.
8. method for designing as claimed in claims 6 or 7, is characterized in that, described acoustic characteristic at least comprises one of following: resonance frequency F0, frequency response curve Q value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410849782.6A CN104602168B (en) | 2014-12-31 | 2014-12-31 | A kind of Microspeaker module and its design method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410849782.6A CN104602168B (en) | 2014-12-31 | 2014-12-31 | A kind of Microspeaker module and its design method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104602168A true CN104602168A (en) | 2015-05-06 |
| CN104602168B CN104602168B (en) | 2018-01-09 |
Family
ID=53127599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410849782.6A Active CN104602168B (en) | 2014-12-31 | 2014-12-31 | A kind of Microspeaker module and its design method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104602168B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104819315A (en) * | 2015-05-11 | 2015-08-05 | 歌尔声学股份有限公司 | Air valve and loudspeaker |
| CN105188003A (en) * | 2015-09-30 | 2015-12-23 | 歌尔声学股份有限公司 | Loudspeaker module |
| CN107371115A (en) * | 2017-07-18 | 2017-11-21 | Tcl移动通信科技（宁波）有限公司 | A kind of detection method, storage medium and the terminal of complete machine loudspeaker performance |
| CN109716789A (en) * | 2016-09-02 | 2019-05-03 | 东京音响株式会社 | Electroacoustic transducer |
| US11330363B2 (en) | 2018-06-29 | 2022-05-10 | Huawei Technologies Co., Ltd. | Speaker and mobile terminal |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1842222A (en) * | 2005-04-01 | 2006-10-04 | 创新科技有限公司 | Multimedia speaker product |
| US20110085684A1 (en) * | 2009-10-12 | 2011-04-14 | Samsung Electronics Co., Ltd. | Piezoelectric micro speaker |
| CN103108269A (en) * | 2013-02-07 | 2013-05-15 | 歌尔声学股份有限公司 | Speaker module and electronic device using the same |
| CN103118320A (en) * | 2013-01-18 | 2013-05-22 | 歌尔声学股份有限公司 | Ultrathin loudspeaker module |
| CN103458337A (en) * | 2013-09-18 | 2013-12-18 | 歌尔声学股份有限公司 | Loudspeaker module |
| CN203466959U (en) * | 2013-09-18 | 2014-03-05 | 歌尔声学股份有限公司 | Loudspeaker module group |
| CN103686550A (en) * | 2013-11-18 | 2014-03-26 | 歌尔声学股份有限公司 | Loudspeaker module group |
-
2014
- 2014-12-31 CN CN201410849782.6A patent/CN104602168B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1842222A (en) * | 2005-04-01 | 2006-10-04 | 创新科技有限公司 | Multimedia speaker product |
| US20110085684A1 (en) * | 2009-10-12 | 2011-04-14 | Samsung Electronics Co., Ltd. | Piezoelectric micro speaker |
| CN103118320A (en) * | 2013-01-18 | 2013-05-22 | 歌尔声学股份有限公司 | Ultrathin loudspeaker module |
| CN103108269A (en) * | 2013-02-07 | 2013-05-15 | 歌尔声学股份有限公司 | Speaker module and electronic device using the same |
| CN103458337A (en) * | 2013-09-18 | 2013-12-18 | 歌尔声学股份有限公司 | Loudspeaker module |
| CN203466959U (en) * | 2013-09-18 | 2014-03-05 | 歌尔声学股份有限公司 | Loudspeaker module group |
| CN103686550A (en) * | 2013-11-18 | 2014-03-26 | 歌尔声学股份有限公司 | Loudspeaker module group |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104819315A (en) * | 2015-05-11 | 2015-08-05 | 歌尔声学股份有限公司 | Air valve and loudspeaker |
| CN104819315B (en) * | 2015-05-11 | 2017-07-04 | 歌尔股份有限公司 | A kind of air valve and loudspeaker |
| CN105188003A (en) * | 2015-09-30 | 2015-12-23 | 歌尔声学股份有限公司 | Loudspeaker module |
| CN109716789A (en) * | 2016-09-02 | 2019-05-03 | 东京音响株式会社 | Electroacoustic transducer |
| CN107371115A (en) * | 2017-07-18 | 2017-11-21 | Tcl移动通信科技（宁波）有限公司 | A kind of detection method, storage medium and the terminal of complete machine loudspeaker performance |
| US11330363B2 (en) | 2018-06-29 | 2022-05-10 | Huawei Technologies Co., Ltd. | Speaker and mobile terminal |
| US11622189B2 (en) | 2018-06-29 | 2023-04-04 | Huawei Technologies Co., Ltd. | Speaker and mobile terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104602168B (en) | 2018-01-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104602168A (en) | Micro loudspeaker module and design method thereof | |
| US10889525B2 (en) | Sound absorption material preparation method, sound absorption material and filling method thereof | |
| CN204305300U (en) | Double-frequency coaxial earphone | |
| CN204350286U (en) | Acoustic equipment | |
| CN104956693B (en) | Resonance for audio-frequency transducer system damps | |
| CN101931845A (en) | Multi function micro speaker | |
| US8290179B2 (en) | Multiple-use acoustic port | |
| CN105519129B (en) | The audio output device of multi-channel audio and the display device using it can be exported | |
| CN103079162A (en) | Integrated loudspeaker, sound box and manufacturing method | |
| CN105208486B (en) | A kind of Headphone structure | |
| CN207460510U (en) | A kind of loud speaker module | |
| CN101711005B (en) | Device for improving outgoing loudspeaker responses | |
| CN103581809B (en) | A kind of terminal and its receiver | |
| CN208638636U (en) | Loudspeaker enclosure | |
| CN103581806B (en) | Electroacoustic transducer | |
| CN103686555A (en) | Miniature loudspeaker module group and method for enhancing frequency response of miniature loudspeaker module group, and electronic device | |
| CN101931846A (en) | Multifunction micro speaker | |
| CN109218895A (en) | Loudspeaker enclosure | |
| CN204795473U (en) | Electronic device | |
| CN204681593U (en) | Electret microphone | |
| CN204761700U (en) | Loudspeaker module group | |
| CN204157049U (en) | Multitone ring is coaxially with source of sound loud speaker | |
| CN104685902A (en) | Sound transducer acoustic back cavity system | |
| CN207926912U (en) | Loudspeaker enclosure | |
| CN204442674U (en) | A kind of loud speaker module |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210910 Address after: 518052 a605, building G4, TCL International e city, Shuguang community, Xili street, Nanshan District, Shenzhen City, Guangdong Province Patentee after: Shenzhen yingmu Technology Co.,Ltd. Address before: 518057 South Mountain High-tech Industrial Park North District, Shenzhen City, Guangdong Province, 1 Kupai Information Port, 6 floors Patentee before: YULONG COMPUTER TELECOMMUNICATION SCIENTIFIC (SHENZHEN) Co.,Ltd. |