CN109413521A - Mobile phone real-time phonetic translates bi-directional microphones - Google Patents
Mobile phone real-time phonetic translates bi-directional microphones Download PDFInfo
- Publication number
- CN109413521A CN109413521A CN201710713166.1A CN201710713166A CN109413521A CN 109413521 A CN109413521 A CN 109413521A CN 201710713166 A CN201710713166 A CN 201710713166A CN 109413521 A CN109413521 A CN 109413521A
- Authority
- CN
- China
- Prior art keywords
- microphone
- mobile phone
- pcb component
- pedestal
- directional microphones
- 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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
Abstract
The invention discloses a kind of mobile phone real-time phonetics to translate bi-directional microphones, configure voiced translation software, microphone on turning off a mobile phone, being inserted into mobile phone charging jack can be used, comprising Mike's fan housing, it is in horizontal concave arc shape, sets multiple ventholes on cancave cambered surface, to make to be equipped with concave station rank, the boss rank fitting of the concave station rank and pedestal below pickup towards talk people；One pedestal, towards microphone holder, multiple ventholes be which is provided with for pickup, PCB component is placed in pedestal, the upper end is equipped with the boss rank closed with the microphone enclosure: a MEMS PCB component, it which is provided with the MEMS microphone of plug and two directive property, left and right PCB component clamping plate card merges in merging pedestal: left and right PCB component clamping plate, it is respectively equipped with buckle and card slot, the engaging of MEMS PCB component is placed into pedestal, it avoids including ambient noise, obtain voiced translation accurate and smooth, when overseas travel is asked the way or is linked up, suitable distance can be kept with other side, meet international etiquette.
Description
Technical field
The present invention relates to microphone techniques fields, particularly relate to a kind of mobile phone real-time phonetic translation bi-directional microphones.
Background technique
With the fast development of smart phone and its application software, creators have found the mobile device for mobile phone
Market prospects and creative potential.Therefore many peripheral products come into being, and mobile phone is one of them with microphone.
Mobile phone microphone in the streets, mostly in the microphone or volume of single direction setting single directivity
It is excessive, and production and assembly are cumbersome.Using the microphone of the microphone of single directivity, translated being applied to real-time phonetic of the invention
When, to reach the preferable effect of voiced translation, the direction of microphone need to be adjusted so that microphone alignment needs to include its sound
Personnel, and mobile phone holder with talk people at a distance from must not be too far away, otherwise easily include arround noise, influence voiced translation matter
Amount；But both sides' distance loses ceremony if too close again.Moreover the excessive microphone of volume in use can shield portions
The earpiece holes or speaker hole of mobile phone, to influence the normal use of its function.
It can be seen that the above-mentioned mobile microphone device commonly used still has missing, real non-kindhearted design, and urgently changed
It is good.
Creator of the invention is urgently thinking to be improved innovation, and taken great pains to attain one's goal grind with great concentration for many years in view of the foregoing
After studying carefully, successfully the present invention is completed in research and development finally.
Summary of the invention
The purpose of the present invention is to provide a kind of mobile phone real-time phonetics to translate bi-directional microphones, realizes in use,
Even if mobile phone rotate proper angle, also can pickup understand, reach mobile phone real-time phonetic translation precision.
Based on this, the present invention mainly uses utilising techniques, Lai Shixian above-mentioned purpose.
A kind of mobile phone real-time phonetic translates bi-directional microphones, includes: Mike's fan housing, is in horizontal concave arc shape, on cancave cambered surface
Multiple ventholes are set, to make pickup towards talk people, are equipped with concave station rank, the boss rank of the concave station rank and pedestal below
Fitting；One pedestal which is provided with multiple ventholes for pickup towards microphone holder, and PCB component is placed in pedestal,
Upper end is equipped with the boss rank closed with the microphone enclosure: a MEMS PCB component which is provided with plug and two be differently directed
Property MEMS microphone, by left and right PCB component clamping plate card merge merging pedestal in: left and right PCB component clamping plate is respectively equipped with
The engaging of MEMS PCB component is placed into pedestal by buckle and card slot.
Further, microphone is respectively provided with a microphone in opposite both direction.
Further, a microphone is that cardioid filters microphone of making an uproar, another microphone is that super core shape filters wheat of making an uproar
Gram wind.
A kind of mobile phone real-time phonetic translates another embodiment of bi-directional microphones, includes: one group or so each microphone
Cover, respectively sets multiple ventholes thereon, splits hollow pipe two side ends, and Zuo Maike fan housing is equipped on multiple snap-ons and right Mike's fan housing
Shrinkage pool fitting；One hollow pipe, anchor ring set a square hole, and microphone is passed through with PCB component connection line and engaged with pedestal；One bottom
Seat which is provided with a cannular boss, and the two sides of the cannular boss are equipped with multiple buckles, and the buckle engages electret capacitor
PCB component；One electret capacitor PCB component, which is provided with plug, by PCB component or so clamping plate buckle and card slot it is mutual
It is fixed.
Further, microphone is respectively provided with a microphone in opposite both direction.
Further, a microphone is that cardioid filters microphone of making an uproar, another microphone is that super core shape filters wheat of making an uproar
Gram wind.
After above-mentioned technological means, the present invention passes through the microphone of two being differently directed property of setting, when towards friendship
The microphone of people is talked, pickup filters microphone of making an uproar using super core shape, may achieve the clear pickup in certain distance, so can be with talk
People keeps sociodistance；When the microphone towards mobile phone holder, pickup filters microphone of making an uproar using cardioid, so in use process
In, mobile phone rotate proper angle, also can pickup understand, with reach mobile phone real-time phonetic translation precision.
Detailed description of the invention
Figure 1A is the stereoscopic schematic diagram for the MEMS wheat wind that mobile phone real-time phonetic of the present invention translates bi-directional microphones.
Figure 1B is that another visual angle for the MEMS condenser microphone that mobile phone real-time phonetic of the present invention translates bi-directional microphones is vertical
Body schematic diagram.
Fig. 2A is that the stereo decomposing for the MEMS condenser microphone that mobile phone real-time phonetic of the present invention translates bi-directional microphones shows
It is intended to.
Fig. 2 B is that another visual angle for the MEMS condenser microphone that mobile phone real-time phonetic of the present invention translates bi-directional microphones is vertical
Body decomposition diagram.
Fig. 3 is the assembling procedure signal for the MEMS condenser microphone that mobile phone real-time phonetic of the present invention translates bi-directional microphones
Figure.
Fig. 4 is that the insertion mobile phone for the MEMS condenser microphone that mobile phone real-time phonetic of the present invention translates bi-directional microphones uses
Schematic diagram.
Fig. 5 A is that letter is simulated in the output for the MEMS condenser microphone that mobile phone real-time phonetic of the present invention translates bi-directional microphones
Number circuit design schematic diagram.
Fig. 5 B is the output number news for the MEMS condenser microphone that mobile phone real-time phonetic of the present invention translates bi-directional microphones
Number circuit design schematic diagram.
Fig. 6 A to Fig. 6 B is the three-dimensional signal for the electret condenser microphone that mobile phone real-time phonetic of the present invention translates bi-directional microphones
Figure.
Fig. 7 A to Fig. 7 B is the solid for the electret condenser microphone that mobile phone real-time phonetic of the present invention translates bi-directional microphones
Decomposition diagram.
Fig. 8 A to Fig. 8 C is the assembling for the electret condenser microphone that mobile phone real-time phonetic of the present invention translates bi-directional microphones
Process schematic diagram.
Fig. 9 is that the insertion mobile phone for the electret condenser microphone that mobile phone real-time phonetic of the present invention translates bi-directional microphones uses
Schematic diagram.
Figure 10 A to Figure 10 B is the electricity for the electret condenser microphone that mobile phone real-time phonetic of the present invention translates bi-directional microphones
Road design diagram.
[symbol description]
The MEMS condenser microphone of 00 mobile phone real-time phonetic translation bi-directional microphones
10 Mike's fan housing, 11 cancave cambered surface, 12 venthole
13 concave station rank, 14 relief hole
20 pedestal, 21 venthole, 22 boss rank
23 PCB components and its clamping plate accommodating space
30 MEMS PCB component, 31 plug (Type-c or Lighting etc.)
40 PCB component left clamp of P1/P2 MEMS microphone
40/50 PCB component or so clamping plate, 41 venthole 42 buckle
43 U-shaped snap-ons
Right 51 card slot of clamping plate of 50 PCB components
A mobile phone
The electret condenser microphone of 01 mobile phone real-time phonetic translation bi-directional microphones
010 left 011 snap-on 012 of Mike's fan housing buckle
013 shrinkage pool, 014 venthole
P11/P21 electret capacitor microphone component
020 hollow pipe, 021 square hole
030 right 031 shrinkage pool of Mike's fan housing, 032 venthole
040 pedestal, 041 cannular boss 042 buckle
043 PCB component and its clamping plate accommodating space
050 electret capacitor PCB component, 051 plug (Type-c or Lighting etc.)
060/070 PCB component or so clamping plate 061 buckles 062 threading groove
071 card slot, 072 threading groove
073 buckle
W microphone and PCB component connection line.
Specific embodiment
To enable above-mentioned and other purposes of the present invention, feature and advantage to be clearer and more comprehensible, it is cited below particularly out preferable two
Embodiment, and cooperate institute's accompanying drawings, it is described in detail below.
It please refers to shown in Figure 1A, Figure 1B, Fig. 2A and Fig. 2 B, translates bi-directional microphones for mobile phone real-time phonetic of the present invention
MEMS (Micro-electro-mechanical Systems；MEMS) solid of microphone 00 and stereo decomposing signal
Figure mainly includes:
One Mike's fan housing 10, a pedestal 20, a MEMS PCB component 30 and PCB component or so clamping plate 40/50, in which:
Mike's fan housing 10, to fitting partial PCB assemblies, appearance is arranged to horizontal concave arc shape, the cancave cambered surface towards talk people end
Multiple ventholes 12 are provided on 11, to reach the accurate pickup of talk people；Be provided with a concave station rank 13 below, so as to bottom
22 sets of merging adhesions of boss rank of seat 20；Mike's fan housing 10 is additionally provided with the relief hole 14 of a PCB component.
Pedestal 20, to connect Mike's fan housing 10 and engaging PCB component or so clamping plate 40/50.Hold towards microphone
People end is provided with multiple ventholes 21, to reach the pickup to holder；Pedestal 20 is additionally provided with a boss rank 22, is used for and Mike
The 13 fitting adhesion of concave station rank of fan housing 10；Pedestal 20 is additionally provided with a PCB component and its clamping plate accommodating space 23.
MEMS PCB component 30 which is provided with plug 31(such as Type-c or Lightning etc.), 31 proximal end of plug
PCB is equipped with the MEMS microphone P2 that a cardioid filters microphone of making an uproar, and is effectively using model to mobile phone holder to realize
Enclose interior pickup；The long-range other side PCB of plug 31 is equipped with the MEMS microphone P1 that a super core shape filters microphone of making an uproar, with
It realizes the accurate pickup to the talk people in sociodistance, keeps the translation of mobile phone real-time phonetic more accurate smooth.MEMS
(MEMS) microphone is compared to conventional condenser (ECM) microphone, and MEMS microphone is not only small in size, power consumption is low, while steady
Fixed degree is higher, and ambient enviroment signal is interfered, has preferable filter capacity.
PCB component or so clamping plate 40/50 to fixed MEMS PCB component 30, and is connected together with pedestal 20.
The venthole 41 and multiple buckles 42 of a microphone, the buckle 42 and the right clamping plate of PCB component are provided in PCB component left clamp 40
The card slot 51 being arranged on 50 is mutually clamped connection；A U-shaped snap-on 43 is additionally provided in PCB component left clamp 40, on pedestal 20
The venthole 21 being arranged fastens, and reaches purpose secured to one another.
It please refers to shown in Fig. 3, the MEMS of mobile phone real-time phonetic translation bi-directional microphones of the present invention is disclosed in figure
(MEMS) 00 assembling procedure schematic diagram of microphone.Its process is as follows:
It is positioned step 1: MEMS PCB component 30 is placed in the right clamping plate 50 of PCB component, then by PCB component left clamp 40
It is snapped into the right clamping plate 50 of PCB component；
Step 2: the component that previous step is completed is inserted in pedestal 20, and it is fixed；
Step 3: the uniform spreading glue on the boss rank 22 of pedestal 20, then Mike's fan housing 10 on top is inserted in bonding, product
It is completed.
It please refers to shown in Fig. 4, the MEMS microphone 00 of mobile phone real-time phonetic translation bi-directional microphones of the present invention is disclosed in figure
It is inserted into mobile phone A and uses schematic diagram.Before using real-time phonetic translation software, the APP of function or customization in available handsets, first
Microphone on mobile phone is turned off, so can avoid the noise by arround and include, obtain voiced translation accurate and smooth.
It please refers to shown in Fig. 5 A and Fig. 5 B, the MEMS of mobile phone real-time phonetic translation bi-directional microphones of the present invention is disclosed in figure
The circuit design schematic diagram of microphone 00.This product is by two MEMS (MEMS) microphone P1/P2, microprocessors
(CPU)/signal processor (DSP) and a such as Type C or Lightning plug composition, P1 towards talk people, P2 towards
Two microphone signals are converted into digital signal via analog-digital converter (ADC) and input to microprocessor (CPU) by holder,
Microprocessor (CPU) has signal processing unit (DSP), can eliminate the environment noise in signal, to obtain high quality news
Number output, this output signal can be set to analog signal or digital signal, depending on mobile phone.
Please refer to Fig. 6 A, Fig. 6 B, shown in Fig. 7 A and Fig. 7 B, disclosed in figure mobile phone real-time phonetic of the present invention translate it is two-way
The solid and perspective exploded view of the electret condenser microphone 01 of another embodiment of microphone mainly include:
One left Mike's fan housing 010, an electret capacitor microphone P21, a hollow pipe 020, right Mike's fan housing 030, an electret
Capacitor microphone P11, a pedestal 040, an electret capacitor PCB component 050 and PCB component or so clamping plate 060/070.Wherein:
Left Mike's fan housing 010 which is provided with multiple snap-ons 011 and buckle 012, respectively to fitting electret capacitor microphone P21
To engage the shrinkage pool 031 on hollow pipe 020 and right Mike's fan housing 030；Left Mike's fan housing 010 is additionally provided with a shrinkage pool 013, for
Microphone passes through with PCB component connection line W and engages with pedestal 040；Left Mike's fan housing 010 is additionally provided with multiple ventholes 014.
Hollow pipe 020, to coat left and right Mike's fan housing 010/030, one anchor ring sets a square hole 021, for microphone with
PCB component connection line W is passed through and is engaged with the buckle 042 being arranged on resigning pedestal 040.
Electret capacitor microphone component P11/P21, because its is small in size, structure is simple, electroacoustic performance is good, the spies such as cheap
Point is widely used, and P21 filters microphone of making an uproar towards holder, using cardioid, can understand that picking up mobile phone hold in a certain range
The sound of someone.
Right Mike's fan housing 030 which is provided with multiple shrinkage pools 031 to fitting electret capacitor microphone component P11, multiple
Venthole 032；Fastening is mutually clamped with left Mike's fan housing 010.
Electret capacitor microphone component P11, this microphone filters microphone of making an uproar towards talk people, using super core shape, in a spacing
Pickup is understood from interior realization, to keep voiced translation more accurate.
Pedestal 040, to connect the microphone shade assembly on top and engage PCB component or so clamping plate 060/070.Pedestal
040 is equipped with a cannular boss 041；To avoid microphone and PCB component connection line W, and realize and the engaging of PCB cleat assembly；In
Empty 041 two sides of boss are equipped with multiple buckles 042, to engage electret capacitor PCB component 050；Pedestal 040 is additionally provided with a PCB
Component and its clamping plate accommodating space 043.
Electret capacitor PCB component 050 has the plug 051 of Type-c or Lightning etc. thereon.
PCB component or so clamping plate 060/070 to fixed electrode capacitor PCB component 050, and engages company with pedestal 040
It connects.It is mutual that the card slot 071 being arranged on multiple buckles 061, with the right clamping plate 070 of PCB component is provided in PCB component left clamp 060
It is connected together；PCB component or so clamping plate 060/070 further respectively has a threading groove 062/072.On the right clamping plate 070 of PCB component also
Equipped with multiple buckles 073, is reached with this and fastened with the engaging of pedestal 040.
It please refers to shown in Fig. 8 A to 8C, the electret electricity of mobile phone real-time phonetic translation bi-directional microphones of the present invention is disclosed in figure
Hold 001 assembling procedure schematic diagram of microphone.Its process is as follows:
Step 1: respectively by left and right electret capacitor microphone P21/P11 burn-on appropriate length microphone and PCB component connection line W
It is placed into and positions and fasten in left and right Mike's fan housing 010/030；
Step 2: left side microphone and PCB component connection line W to be passed through to the square hole 021 of hollow pipe, and by 010 set of left Mike's fan housing
Enter the engaging positioning of hollow pipe 020；
Step 3: the right microphone and PCB component connection line W to be passed through to the square hole 021 of hollow pipe, and by 030 set of right Mike's fan housing
Enter hollow pipe 020 and engages positioning with left Mike's fan housing 010；
Step 4: the connecting line W of left and right microphone and PCB component is passed through the PCB component and its clamping plate accommodating space on pedestal 040
043, and be welded on electret capacitor PCB component 050；
Step 5: the electret capacitor PCB component 050 for welding microphone and PCB component connection line W is placed in the right clamping plate of PCB component
Positioning in 070, then PCB component left clamp 060 is snapped into the right clamping plate 070 of PCB component；
Step 6: the component that previous step is completed is inserted in pedestal 040, and it is fixed；
It is positioned step 7: 040 assembly set of pedestal is incorporated into engage in the square hole 021 of hollow pipe 020, assembling product is completed.
It please refers to shown in Fig. 9, the electret capacitor wheat of mobile phone real-time phonetic translation bi-directional microphones of the present invention is disclosed in figure
Gram wind 01 is inserted into mobile phone A and uses schematic diagram.Low-profile of the present invention will not influence the earphone jack of mobile phone and normally making for loudspeaker
With.Comply with the development of mobile phone real-time phonetic translation software, the present invention tourism and international exchange in the market, have it necessary and real
The property used.
It please refers to shown in Figure 10 A to Figure 10 B, the electret of mobile phone real-time phonetic translation bi-directional microphones of the present invention is disclosed in figure
The circuit design schematic diagram of body capacitance microphone 01.This product is by two electret capacitor microphone component P11/P21, micro processs
Device/signal processor (CPU/DSP) and Type C or Lightning plug composition.Its circuit theory is the same as figure 5 above A to figure
Described in 5B, details are not described herein.
Above-listed that illustrating for possible embodiments of the invention is described in detail, the embodiment is not to limit this hair
Bright the scope of the patents, all equivalence enforcements or change without departing from carried out by technical spirit of the present invention are intended to be limited solely by of the invention special
In sharp range.The scope of the present invention should be as is described in the claims.
Claims (6)
1. a kind of mobile phone real-time phonetic translates bi-directional microphones, which is characterized in that include:
One Mike's fan housing is in horizontal concave arc shape, multiple ventholes is arranged on cancave cambered surface, to make pickup towards talk people, below
Equipped with concave station rank, the boss rank fitting of the concave station rank and pedestal；
One pedestal which is provided with multiple ventholes for pickup towards microphone holder, and PCB component is placed in pedestal,
The upper end is equipped with the boss rank closed with the microphone enclosure:
One MEMS PCB component, which is provided with the MEMS microphone of plug and two being differently directed property, by left and right
PCB component clamping plate card merges in merging pedestal:
Left and right PCB component clamping plate, is respectively equipped with buckle and card slot, and the engaging of MEMS PCB component is placed into pedestal.
2. mobile phone real-time phonetic as described in claim 1 translates bi-directional microphones, it is characterised in that: microphone is opposite two
A direction is respectively provided with a microphone.
3. mobile phone real-time phonetic as claimed in claim 2 translates bi-directional microphones, it is characterised in that: a microphone is
Cardioid filters microphone of making an uproar, another microphone is that super core shape filters microphone of making an uproar.
4. a kind of mobile phone real-time phonetic translates bi-directional microphones, which is characterized in that include:
One group or so each Mike fan housing, respectively sets multiple ventholes thereon, splits hollow pipe two side ends, and Zuo Maike fan housing is equipped with
Shrinkage pool fitting on multiple snap-ons and right Mike's fan housing；
One hollow pipe, anchor ring set a square hole, and microphone is passed through with PCB component connection line and engaged with pedestal；
One pedestal which is provided with a cannular boss, and the two sides of the cannular boss are equipped with multiple buckles, and the buckle engages electret
Body capacitance PCB component；
One electret capacitor PCB component, which is provided with plug, is mutually clamped by the buckle on PCB component or so clamping plate with card slot
It is fixed.
5. mobile phone real-time phonetic as claimed in claim 4 translates bi-directional microphones, it is characterised in that: microphone is opposite two
A direction is respectively provided with a microphone.
6. mobile phone real-time phonetic as claimed in claim 5 translates bi-directional microphones, it is characterised in that: a microphone is
Cardioid filters microphone of making an uproar, another microphone is that super core shape filters microphone of making an uproar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710713166.1A CN109413521A (en) | 2017-08-18 | 2017-08-18 | Mobile phone real-time phonetic translates bi-directional microphones |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710713166.1A CN109413521A (en) | 2017-08-18 | 2017-08-18 | Mobile phone real-time phonetic translates bi-directional microphones |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109413521A true CN109413521A (en) | 2019-03-01 |
Family
ID=65462854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710713166.1A Pending CN109413521A (en) | 2017-08-18 | 2017-08-18 | Mobile phone real-time phonetic translates bi-directional microphones |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109413521A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100161310A1 (en) * | 2008-12-24 | 2010-06-24 | Lin-Sung Chao | Two-way translator structure |
| CN103096208A (en) * | 2011-11-02 | 2013-05-08 | 蒂雅克股份有限公司 | Stereo microphone device |
| CN103856857A (en) * | 2012-12-06 | 2014-06-11 | 美商富迪科技股份有限公司 | Electronic device |
| TWM511695U (en) * | 2015-06-11 | 2015-11-01 | High Top Prec Electronic Co Ltd | Fastening structure of electronic device |
| US20160066074A1 (en) * | 2014-09-03 | 2016-03-03 | Ik Multimedia Production Srl | Stereo microphone for mobile devices |
-
2017
- 2017-08-18 CN CN201710713166.1A patent/CN109413521A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100161310A1 (en) * | 2008-12-24 | 2010-06-24 | Lin-Sung Chao | Two-way translator structure |
| CN103096208A (en) * | 2011-11-02 | 2013-05-08 | 蒂雅克股份有限公司 | Stereo microphone device |
| CN103856857A (en) * | 2012-12-06 | 2014-06-11 | 美商富迪科技股份有限公司 | Electronic device |
| US20160066074A1 (en) * | 2014-09-03 | 2016-03-03 | Ik Multimedia Production Srl | Stereo microphone for mobile devices |
| TWM511695U (en) * | 2015-06-11 | 2015-11-01 | High Top Prec Electronic Co Ltd | Fastening structure of electronic device |
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