CN106358128B - Middle pitch compression driving device - Google Patents
Middle pitch compression driving device Download PDFInfo
- Publication number
- CN106358128B CN106358128B CN201610839492.2A CN201610839492A CN106358128B CN 106358128 B CN106358128 B CN 106358128B CN 201610839492 A CN201610839492 A CN 201610839492A CN 106358128 B CN106358128 B CN 106358128B
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- CN
- China
- Prior art keywords
- vibrating diaphragm
- voice coil
- eqalizing cricuit
- driving device
- cylinder body
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Classifications
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- 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
Abstract
A kind of middle pitch compression driving device, including high pitch cylinder body, magnetic circuit system, vibrating diaphragm component, compression-type eqalizing cricuit, diffused eqalizing cricuit and lining lid, high pitch cylinder body is interior to be equipped with several radiating ribs columns；Magnetic circuit system is placed in high pitch cylinder body, and is in contact with radiating ribs column；Vibrating diaphragm component is set to the opening of high pitch cylinder body upper end, vibrating diaphragm component is made of vibrating diaphragm, voice coil, several retention tabs, voice coil upper end is fixed on vibrating diaphragm, lower end is arranged in magnetic circuit system, compression-type eqalizing cricuit is set to above vibrating diaphragm component and is attached thereto, diffused eqalizing cricuit is set on lining lid lower surface, which sequentially passes through compression-type eqalizing cricuit, vibrating diaphragm component, magnetic circuit system and extend into high pitch cylinder base；Voice coil includes speech coil framework and the voice coil line that is around in inside and outside speech coil framework, and the surface of voice coil line is coated with high-temperature insulating paint.The present invention has good heat dissipation performance, and can reduce diaphagras, improves the speech fidelity under sound pressure level state, practical, is suitable for popularization and application.
Description
Technical field
The present invention relates to stereo set technical field more particularly to a kind of middle pitch compression driving devices.
Background technique
With the continuous development of scientific research technology, to the performance of loudspeaker, more stringent requirements are proposed, requires
The characteristics such as high sound quality, speech articulation, high reliability.And the above-mentioned characteristic of loudspeaker and heat dissipation performance, vibrating diaphragm and voice coil
It is related.However, existing voice coil is coupled with magnetic circuit system, when long after use, voice coil can improve magnetic circuit while fever
The temperature of system, voice coil and magnetic circuit system are sealed in high pitch cylinder body, thus are unable to rapid cooling, to influence whether sound quality.
In addition, existing vibrating diaphragm generally uses the vibrating diaphragm of cheese, the vibrating diaphragm of cheese must have high physical toughness, this
The acquirement of kind physical toughness is first is that by selecting high elastic modulus material, second is that being achieved by the thickness for increasing film.On however,
It states method and correspondingly also increases the weight of diaphragm, higher power is needed to drive diaphragm, to reduce the effect of loudspeaker
Rate.And if mitigate the weight of vibrating diaphragm, then need the thickness for reducing vibrating diaphragm, or use lighter material, and thin vibrating diaphragm thickness
Or diaphagras is then easy to produce using lighter material, lead to the generation of distortion.
Summary of the invention
For this purpose, being dissipated the purpose of the present invention is to provide a kind of middle pitch compression driving device with solving current driving device
Hot property is poor, is easy to produce diaphagras leads to distortion.
To achieve the above object, the present invention mainly uses following technical scheme are as follows:
A kind of middle pitch compression driving device, including the high pitch cylinder body, magnetic circuit system, vibrating diaphragm group set gradually from the bottom to top
Part, compression-type eqalizing cricuit, diffused eqalizing cricuit and lining lid, high pitch cylinder body upper surface are equipped with annular groove, annular groove
Several radiating ribs columns are distributed on lateral wall；The magnetic circuit system includes magnetic cup, the magnet being placed in magnetic cup and is set to
On magnet and the washer that is placed in magnetic cup, a magnetic gap is formed between magnet, washer and magnetic cup, the magnetic cup is placed in annular
In groove, and between radiating ribs column and annular groove inner sidewall, the radiating ribs column carries out magnetic cup to support limit；The vibration
Membrane module is set to the opening of high pitch cylinder body upper end, and vibrating diaphragm component includes vibrating diaphragm, voice coil and several retention tabs, the retention tab
Being set to vibrating diaphragm, two sides, the voice coil upper end are fixed on vibrating diaphragm up and down, and lower end is arranged in magnetic gap, and described compression-type etc. is changed
Device is set to above vibrating diaphragm component and is attached thereto, and the diffused eqalizing cricuit is set on lining lid lower surface, and the diffused etc. is changed
Device sequentially passes through compression-type eqalizing cricuit, vibrating diaphragm component, magnetic circuit system and extend into high pitch cylinder base；The voice coil includes voice coil
Skeleton and the voice coil line being around in inside and outside speech coil framework, the surface of the voice coil line are coated with the resistance to height that blackness value is 0.85~1
Warm insulated paint.
Further, the vibrating diaphragm is arranged in a ring, and the V-shaped setting in unilateral cross section of vibrating diaphragm, the voice coil is fixed on
The V-arrangement vertex position of vibrating diaphragm, vibrating diaphragm are each formed with vibration area inside and outside voice coil.
Further, the material of the high pitch cylinder body is die casting aluminum material, and the middle part of high pitch cylinder body is equipped with about one and runs through
The cavity of high pitch cylinder body, the cavity form a bugle.
Further, the inside cavity of the high pitch cylinder body is equipped with the sound-absorbing material for cutting down standing wave, the sound absorber
Material is acoustical cotton.
Further, the magnetic cup, magnet, washer are a cyclic structure, the diameter phase of the magnet, washer
Deng, and the diameter of respectively less than magnetic cup, magnetic gap is formed between the washer, magnet and magnetic cup.
Further, the side close to magnetic cup of several radiating ribs columns encloses one and magnetic cup outer surface phase
The shape and structure matched, the inner ring of the annular groove match with the inner ring shape of magnetic cup.
Further, it is equipped with a circular hole in the middle part of the compression-type eqalizing cricuit, is equipped with multiple gas chamber channels around the circular hole,
Gas chamber channel includes the acoustic wave inlet towards vibrating diaphragm, and helically line is distributed the acoustic wave inlet, each acoustic wave inlet and center of circular hole
Distance differ.
Further, the compression-type eqalizing cricuit is formed by the first main body and the second body combination, and the acoustic wave inlet is set
In in the first main body, the gas chamber channel further includes an acoustic wave outlet, and the acoustic wave outlet is set towards the diffused eqalizing cricuit
It sets.
Further, it is equipped with extension at the acoustic wave outlet in each gas chamber channel, the extension is towards the expansion
Type eqalizing cricuit direction is dissipated to extend；And the extension is in gradually smaller pointed setting from the outside to the core.
Further, the material of the magnet is the neodymium iron boron strong magnet of N38H model.
In conclusion in compression driving device of the invention voice coil wear in magnetic gap and magnetic systems be installed in it is scattered
Design between hot muscle column and annular tongue inner sidewall, further improves the heat-sinking capability of voice coil, so as to avoid voice coil fever
Speaker damage or failure are caused, while the raised temperature of magnet after work can be reduced, is conducive to the flowing heat dissipation of air-flow.This
Outside, the design of the V-arrangement vibrating diaphragm, so that the inside of voice coil and lateral area are provided with vibration area, to reduce segmentation
Vibration improves the speech fidelity under sound pressure level state, avoids the problem that language distortion.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of middle pitch compression driving device of the present invention.
Fig. 2 is the decomposition diagram of middle pitch compression driving device shown in FIG. 1.
Fig. 3 is the diagrammatic cross-section of middle pitch compression driving device shown in FIG. 1.
Specific embodiment
In order to enable technical solution of the present invention more clearly to show, the present invention is made with reference to the accompanying drawing further
Explanation.
As shown in Figure 1 to Figure 3, be a kind of middle pitch compression driving device provided by the invention comprising from the bottom to top according to
High pitch cylinder body 10, magnetic circuit system 20, vibrating diaphragm component, compression-type eqalizing cricuit 60, diffused eqalizing cricuit 70 and the lining lid 80 of secondary setting.
The magnetic circuit system 20 is installed in high pitch cylinder body 10, and the vibrating diaphragm component is set to the opening of 10 upper end of high pitch cylinder body, vibration
Membrane module includes several retention tabs 30, vibrating diaphragm 40 and voice coil 50, and the retention tab 30 is installed on about 40 two sides of vibrating diaphragm, institute
It states 50 upper end of voice coil to be fixed on vibrating diaphragm 40, lower end is arranged in magnetic circuit system 20, and the compression-type eqalizing cricuit 60, which is set to, to be kept
The top of piece 30 is simultaneously attached thereto, and the diffused eqalizing cricuit 70 is set on lining 80 lower surface of lid, the diffused eqalizing cricuit 80 according to
It is secondary to pass through compression-type eqalizing cricuit 60, vibrating diaphragm component, magnetic circuit system 20 and extend into 10 bottom of high pitch cylinder body.
The high pitch cylinder body 10 is prepared by metal material, specifically, the high pitch cylinder body 10 by die casting aluminium prepare and
At.It is to be appreciated that in other embodiments, the high pitch cylinder body 10 or other suitable materials are prepared.It is high
10 upper surface of sound cylinder body is equipped with annular groove 11, and the middle part of high pitch cylinder body 10 is equipped with a hollow cavity 12, on the cavity 12
Down through high pitch cylinder body 10 and one bugle of formation.The sound-absorbing material for cutting down standing wave, this reality are also had additional in the cavity 12
It applies in example, the sound-absorbing material is acoustical cotton.The setting of sound-absorbing material in the present embodiment, so that driving device internal build is good
Good acoustic enviroment, avoids standing wave from interfering the propagation of original sound.
Several radiating ribs columns 13, the magnetic are evenly distributed on the outside side wall of the annular groove 11 of the high pitch cylinder body 10
Road system 20 is installed between radiating ribs column 13 and the inside side walls of annular groove 11.The magnetic circuit system 20 include magnetic cup 21,
The magnet 22 that is placed in magnetic cup 21 and it is set on magnet 22 and is placed in the washer 23 in magnetic cup 20, the magnetic cup 21,
Magnet 22, washer 23 are cyclic structure.The magnet 22, the diameter of washer 23 are equal, and the diameter of respectively less than magnetic cup 21, institute
It states and forms a magnetic gap between washer 23, magnet 22 and magnetic cup 21.In the present embodiment, the magnet 22 is the strong of neodymium iron boron preparation
Magnet, preferred model N38H, the N38H magnet have stable strong magnetic field.It is to be appreciated that in other implementations
In example, the strong magnet of the magnet 22 or other models.
The voice coil 50 includes speech coil framework and voice coil line, and the surface of the voice coil line is coated with high blackness high-temperature insulation
Paint, to improve the ability of voice coil line radiant heat energy.In the present embodiment, the blackness value of the high blackness high-temperature insulating paint is 0.85
~1.The voice coil line is around in inside and outside speech coil framework, is formed inner, external wire coil structures, is made the surfaces externally and internally of voice coil 50
To the effective radiant heat energy of magnetic circuit system 20, to have superior heat dissipation performance.50 bottom end of voice coil is arranged in the magnetic
In gap, in the cracking radiant heat transfer by inner-outer coil to magnetic cup 21 of heat energy that voice coil 50 generates, the magnetic cup 21
Outer surface is in contact with radiating ribs column 13, enables the heat on magnetic cup 21 is cracking to be transferred to radiating ribs column 13, then from high pitch
Cylinder body 10 is spread out.Therefore, heat caused by even high-power, sound pressure level driving device cracking can also dissipate
Heat.The medial surface of several radiating ribs columns 13 encloses the shape and structure to match with the magnetic cup 21, radiating ribs column 13 1
Determine to limit magnetic circuit system 20 in degree, enable magnetic circuit system 20 firmly in high pitch cylinder body 10, can buffer any
The impact in direction is fallen, and has good vibration resistance, impact-resistant performance.
In the present embodiment, the vibrating diaphragm 40 is arranged in a ring, the V-shaped setting in unilateral cross section of vibrating diaphragm 40.The vibrating diaphragm
Material use PEEK material, this kind of material has excellent bending modulus, make vibrating diaphragm 40 that there is the optimal vibration amount of touching, thus
It ensure that the high sensitivity of driving device to a certain degree.When installation, the voice coil 50 is connected on the V-arrangement vertex of vibrating diaphragm, is removed
Outside the diaphragm area that voice coil 50 is drawn a circle to approve, part vibrating diaphragm is located at the outside of voice coil 50, so that there are vibrating area in the two sides of voice coil 50
Domain, so that entire vibrating diaphragm forms ring-type, so that, under identical quality condition, close to effective vibration radiation sound of voice coil 50
The area of wave greatly increases, so that realizing lesser power can be driven vibrating diaphragm 40 and obtain identical sound wave amount, especially
In high band, resonance frequency is improved, and diaphagras is being reduced, due to reducing quality, before transient response curve
Afterwards along also tending to be precipitous, the speech fidelity under sound pressure level state is improved, thus the problem of can avoid language distortion.
The compression-type eqalizing cricuit 60 includes first device ontology, is equipped with a circular hole in the middle part of the eqalizing cricuit ontology, surrounds
The circular hole forms multiple gas chamber channels, and the gas chamber channel includes the acoustic wave inlet 63 towards vibrating diaphragm 40, and the gas chamber is logical
Helically line is distributed the acoustic wave inlet 63 in road, and the acoustic wave inlet 63 in each gas chamber channel is at a distance from body central.The eqalizing cricuit
Ontology is composed of two annular the first main bodys 61 and the second main body 62, wherein setting in the shape of a spiral in first main body 61
Set multiple acoustic wave inlets 63, multiple bottom surfaces 64 and multiple groups first side 65 corresponding with acoustic wave inlet 63, two the first side walls 65
Channel is constituted between bottom surface 64.Then be provided in second main body 62 top surface and with the first side in the first main body 61
The corresponding concordant multiple groups second side 66 in face 65, that is, first side 65 and second side 66 constitute each gas chamber channel after combining
Side, acoustic wave outlet are made of the top surface of the bottom surface 64 of the first main body 61, first side 66 and the second main body 62.
The compression-type eqalizing cricuit 60 matches with vibrating diaphragm 40 at work, when vibratory sound, on compression-type eqalizing cricuit 60
The gas chamber channel of acoustic wave of the acoustic wave inlet 63 of spiral distribution constitutes geometry bandpass filtering pipe.That is, sound wave is by each logical
When road, some frequency bands enhance some frequency ranges and are attenuated.Extension 67 is equipped at the acoustic wave outlet of each gas passage, and
Extension 67 is pointed, forms the structure of diffused eqalizing cricuit；So that sound field is uniform, thus obtain good frequency response curve and
High sensitivity.
In conclusion voice coil 50 is worn in magnetic gap and magnetic systems 20 are installed in compression driving device of the invention
Design between 11 inner sidewall of radiating ribs column 13 and annular tongue, further improves the heat-sinking capability of voice coil 50, to avoid
The fever of voice coil 50 causes speaker damage or failure, while can reduce the raised temperature of magnet after work, is conducive to air-flow
Flowing heat dissipation.In addition, the design of the V-arrangement vibrating diaphragm 40, so that the inside of voice coil 50 and lateral area are provided with vibration area,
To reduce diaphagras, the speech fidelity under sound pressure level state is improved, avoids the problem that language distortion.
One embodiment of the present invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of middle pitch compression driving device, it is characterised in that: including set gradually from the bottom to top high pitch cylinder body, magnetic circuit system
System, vibrating diaphragm component, compression-type eqalizing cricuit, diffused eqalizing cricuit and lining lid, high pitch cylinder body upper surface are equipped with annular groove, ring
Several radiating ribs columns are distributed on the lateral wall of connected in star；The magnetic circuit system include magnetic cup, the magnet being placed in magnetic cup, with
And the washer for being set on magnet and being placed in magnetic cup, a magnetic gap is formed between magnet, washer and magnetic cup, the magnetic cup holds
It is placed in annular groove, and between radiating ribs column and annular groove inner sidewall, the radiating ribs column carries out magnetic cup to support limit
Position；The vibrating diaphragm component is set to the opening of high pitch cylinder body upper end, and vibrating diaphragm component includes vibrating diaphragm, voice coil and several retention tabs,
The retention tab is set to vibrating diaphragm, and two sides, the voice coil upper end are fixed on vibrating diaphragm up and down, and lower end is arranged in magnetic gap, described
Compression-type eqalizing cricuit is set to above vibrating diaphragm component and is attached thereto, and the diffused eqalizing cricuit is set on lining lid lower surface, should
Diffused eqalizing cricuit sequentially passes through compression-type eqalizing cricuit, vibrating diaphragm component, magnetic circuit system and extend into high pitch cylinder base；The sound
Circle includes speech coil framework and the voice coil line being around in inside and outside speech coil framework, and it is 0.85 that the surface of the voice coil line, which is coated with blackness value,
~1 high-temperature insulating paint.
2. middle pitch compression driving device as described in claim 1, it is characterised in that: the vibrating diaphragm is arranged in a ring, vibrating diaphragm
The V-shaped setting in unilateral cross section, the voice coil is fixed on the V-arrangement vertex position of vibrating diaphragm, vibrating diaphragm equal shape inside and outside voice coil
At there is vibration area.
3. middle pitch compression driving device as claimed in claim 2, it is characterised in that: the material of the high pitch cylinder body is die casting
Aluminum material, the middle part of high pitch cylinder body are equipped with about one cavity for running through high pitch cylinder body, and the cavity forms a bugle.
4. middle pitch compression driving device as claimed in claim 3, it is characterised in that: the inside cavity of the high pitch cylinder body is set
There is the sound-absorbing material for cutting down standing wave, the sound-absorbing material is acoustical cotton.
5. middle pitch compression driving device as described in claim 1, it is characterised in that: the magnetic cup, magnet, washer are ring
Shape structure, the magnet, the diameter of washer are equal, and the diameter of respectively less than magnetic cup, are formed between the washer, magnet and magnetic cup
Magnetic gap.
6. middle pitch compression driving device as claimed in claim 5, it is characterised in that: several radiating ribs columns close to magnetic
The side of cup encloses a shape and structure to match with magnetic cup outer surface, and the inner ring of the annular groove is interior with magnetic cup
Ring-shaped matches.
7. middle pitch compression driving device as described in claim 1, it is characterised in that: be equipped in the middle part of the compression-type eqalizing cricuit
One circular hole is equipped with multiple gas chamber channels around the circular hole, and gas chamber channel includes the acoustic wave inlet towards vibrating diaphragm, and the sound wave enters
Helically line is distributed mouth, and each acoustic wave inlet differs at a distance from center of circular hole.
8. middle pitch compression driving device as claimed in claim 7, it is characterised in that: the compression-type eqalizing cricuit is main by first
Body and the second body combination form, and the acoustic wave inlet is set in the first main body, and the gas chamber channel further includes an acoustic wave outlet,
The acoustic wave outlet is arranged towards the diffused eqalizing cricuit.
9. middle pitch compression driving device as claimed in claim 8, it is characterised in that: the sound wave in each gas chamber channel goes out
Extension is equipped at mouthful, the extension extends towards diffused eqalizing cricuit direction；And the extension is in from the outside to the core
Gradually smaller pointed setting.
10. middle pitch compression driving device as described in claim 1, it is characterised in that: the material of the magnet is N38H type
Number neodymium iron boron strong magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610839492.2A CN106358128B (en) | 2016-09-21 | 2016-09-21 | Middle pitch compression driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610839492.2A CN106358128B (en) | 2016-09-21 | 2016-09-21 | Middle pitch compression driving device |
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| Publication Number | Publication Date |
|---|---|
| CN106358128A CN106358128A (en) | 2017-01-25 |
| CN106358128B true CN106358128B (en) | 2019-05-14 |
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ID=57858514
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610839492.2A Active CN106358128B (en) | 2016-09-21 | 2016-09-21 | Middle pitch compression driving device |
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| CN (1) | CN106358128B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109413551B (en) * | 2018-10-31 | 2020-09-04 | 宁波音沛乐电子有限公司 | Double magnetic circuit middle sound compression driving device |
| CN116233702A (en) * | 2023-01-31 | 2023-06-06 | 广州市声讯电子科技股份有限公司 | Explosion-proof sound amplifier |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000308849A (en) * | 1997-06-30 | 2000-11-07 | Tokin Corp | Vibration actuator for generating sound and lowfrequency vibration |
| US6594372B2 (en) * | 2001-07-30 | 2003-07-15 | Victor Company Of Japan, Ltd. | Electroacoustic transducer |
| CN103826187A (en) * | 2014-02-26 | 2014-05-28 | 谭红梅 | Method and device for improving flexibility of loudspeaker driver |
| CN203813952U (en) * | 2014-02-26 | 2014-09-03 | 东莞市三基音响科技有限公司 | An apparatus for expending a loudspeaker driver frequency scope |
| CN203827508U (en) * | 2014-02-26 | 2014-09-10 | 东莞市三基音响科技有限公司 | Device for improving sensitivity of loudspeaker driver |
-
2016
- 2016-09-21 CN CN201610839492.2A patent/CN106358128B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000308849A (en) * | 1997-06-30 | 2000-11-07 | Tokin Corp | Vibration actuator for generating sound and lowfrequency vibration |
| US6594372B2 (en) * | 2001-07-30 | 2003-07-15 | Victor Company Of Japan, Ltd. | Electroacoustic transducer |
| CN103826187A (en) * | 2014-02-26 | 2014-05-28 | 谭红梅 | Method and device for improving flexibility of loudspeaker driver |
| CN203813952U (en) * | 2014-02-26 | 2014-09-03 | 东莞市三基音响科技有限公司 | An apparatus for expending a loudspeaker driver frequency scope |
| CN203827508U (en) * | 2014-02-26 | 2014-09-10 | 东莞市三基音响科技有限公司 | Device for improving sensitivity of loudspeaker driver |
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| CN106358128A (en) | 2017-01-25 |
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Address after: 523000 building 3, No. 1, Nanqi street, Qiaotou East Road, Qiaotou town, Dongguan City, Guangdong Province Patentee after: 3G AUDIO TECHNOLOGY Co.,Ltd. Address before: No. 28, Xianghe Road, Pingping village, Dalang Town, Dongguan City, Guangdong Province, 523770 Patentee before: 3G AUDIO TECHNOLOGY Co.,Ltd. |