CN201839420U - Miniature moving coil type electroacoustic transducer - Google Patents
Miniature moving coil type electroacoustic transducer Download PDFInfo
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- CN201839420U CN201839420U CN2010202796535U CN201020279653U CN201839420U CN 201839420 U CN201839420 U CN 201839420U CN 2010202796535 U CN2010202796535 U CN 2010202796535U CN 201020279653 U CN201020279653 U CN 201020279653U CN 201839420 U CN201839420 U CN 201839420U
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- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 239000003518 caustics Substances 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000012528 membrane Substances 0.000 abstract 5
- 238000007789 sealing Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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Abstract
The utility model relates to a miniature moving coil type electroacoustic transducer comprising a shell, a magnetic circuit system and a vibrating system that are arranged in the shell, wherein the magnetic circuit system consists of a first magnetism-permeable plate, a magnet and a second magnetism-permeable plate that are arranged in the shell so as to form annular external bosses and internal bosses positioned inside the external bosses at specified intervals, and magnetic clearances are formed between the external bosses and the internal bosses; the vibrating system consists of a vibrating membrane and a driving part combined together with the vibrating membrane and electrically connected with an external circuit, wherein the vibrating membrane consists of a central part, an edge part and a connecting part integrally connected with the central part and the edge part in a sealing manner, and the central part of the vibrating membrane is fixedly arranged on the internal bosses in the magnetic circuit system. The miniature moving coil type electroacoustic transducer can lower the height of products, and prevent the collision between the vibrating membrane and the magnetic circuit system, thus being beneficial to miniature design of the product.
Description
Technical field
The utility model relates to a kind of miniature moving-coil type electroacoustic transducer, specifically, a kind ofly can reduce the product height, prevents the bump miniature moving-coil type electroacoustic transducer of the miniaturized design that helps product of vibrating diaphragm and magnetic circuit system thereby relate to.
Background technology
Along with the development of consumer electronics products such as portable terminal, a large amount of miniature transducer spare particularly miniature moving-coil type electroacoustic transducer has obtained using widely.As everyone knows, the operation principle of miniature moving-coil type electroacoustic transducer is, the voice coil loudspeaker voice coil that is connected with alternating current is stressed and the vibrational system in the vertical direction of miniature moving-coil type electroacoustic transducer is vibrated in magnetic field, thereby sounds.
At present, the miniature moving-coil type electroacoustic transducer with known configurations as shown in Figure 8, it comprises: by vibrating diaphragm 1 and the vibrational system that constitutes with voice coil loudspeaker voice coil 2 ' that vibrating diaphragm 1 combines; Combine by from top to bottom order among the figure and the magnetic circuit system that constitutes by first magnetic conductive board 31, magnet 32 and second magnetic conductive board 33; Form the framework of miniature moving-coil type electroacoustic transducer so that described magnetic circuit system and described vibrational system are installed in wherein shell 4; And be installed in the top of shell 4 so that each parts of miniature moving-coil type electroacoustic transducer are enclosed in the protecgulum 5 of inside.Magnetic circuit system among Fig. 8 is the internal magnetic circuit structure, wherein, second magnetic conductive board 33 is a peviform, in the bottom centre of peviform second magnetic conductive board 33 magnet 32 and first magnetic conductive board 31 are installed successively, like this, the upwardly extending sidewall of second magnetic conductive board 33 just forms outer process, and the magnet 32 and first magnetic conductive board 31 that are positioned at the bottom centre of second magnetic conductive board 33 have then constituted upwardly extending inner process, have just formed magnetic gap between described outer process and described inner process.There is the voice coil loudspeaker voice coil 2 ' that is electrically connected to be placed in the described magnetic gap with the external electronic circuits (not shown), so that produce the actuating force of described vibrational system.
In this miniature moving-coil type electroacoustic transducer with traditional structure, the central part of vibrating diaphragm 1 is relative with magnet 32 formed described inner processes with first magnetic conductive board 31.When the Oscillation Amplitude of vibrating diaphragm 1 is big, the central part of vibrating diaphragm 1 easily with described magnetic circuit system in inner process bump, thereby produce noise, cause the bad of acoustical behavior, and be unfavorable for the microminiaturization of miniature moving-coil type electroacoustic transducer.
So, be necessary above-mentioned miniature moving-coil type electroacoustic transducer with traditional structure is improved the problem that exists with solution.
The utility model content
The utility model is made in order to solve above-mentioned problems of the prior art, thereby its purpose is to provide a kind of can reduce the product height, prevent the bump miniature moving-coil type electroacoustic transducer of the miniaturized design that helps product of vibrating diaphragm and magnetic circuit system.
To achieve these goals, a kind of miniature moving-coil type electroacoustic transducer that provides, it comprises: shell, be arranged on magnetic circuit system and vibrational system in the described shell; Magnetic circuit system comprises first magnetic conductive board, magnet and second magnetic conductive board that is configured in the described shell, described first magnetic conductive board, magnet and second magnetic conductive board form the outer process of ring-type and are positioned at the inner process of described outer process inboard across predetermined distance, form the magnetic gap of described miniature moving-coil type electroacoustic transducer between described outer process and the inner process; Vibrational system comprises vibrating diaphragm and the actuator that combines and be electrically connected with external circuit with described vibrating diaphragm, described vibrating diaphragm comprise central part, edge part and with the airtight connecting portion that is connected of described central part and edge part one, the central part of described vibrating diaphragm is fixed on the inner process in the described magnetic circuit system.
Preferably, the edge part of described vibrating diaphragm is fixed on the outer process of described magnetic circuit system or is fixed on the shell.
Preferably, described actuator is fixed on the lower surface of connecting portion of described vibrating diaphragm, and is in the magnetic gap of described magnetic circuit system.
Preferably, described vibrating diaphragm is a plane diaphragm, and the height of the connecting portion of described vibrating diaphragm is lower than the height of the central part of described vibrating diaphragm.
Preferably, described actuator is a flexible circuit board, and described flexible circuit board is provided with conductive coating, and described conductive coating forms coil on described flexible circuit board, make described actuator can be in described magnetic gap forced vibration.
Preferably, make the conductive coating on the described flexible circuit board form coil by caustic solution.
In addition, preferably, described actuator is voice coil loudspeaker voice coil independently.
Preferably, described magnetic circuit system is a two magnetic route structure, described first magnetic conductive board comprises the magnetic conductive board and the first outer magnetic conductive board in first, described magnet comprises inner magnet and outer magnet, in described first magnetic conductive board and inner magnet together and the described first outer magnetic conductive board and outer magnet form the inner process and the outer process of described magnetic circuit system together respectively.
Preferably, described magnetic circuit system is the external magnetic circuit structure, described second magnetic conductive board forms projection in the central as the inner process in the external magnetic circuit structure, is provided with well-balancedly and has then constituted outer process in the external magnetic circuit structure across first magnetic conductive board in predetermined gap and magnet around the described inner process of described second magnetic conductive board.
Preferably, described magnetic circuit system is the internal magnetic circuit structure, and the edge of described second magnetic conductive board upwards is bent to form sidewall as the outer process in the internal magnetic circuit structure, is arranged in first magnetic conductive board of the described second magnetic conductive board central authorities and the inner process that magnet constitutes the internal magnetic circuit structure.
Compared with prior art, miniature moving-coil type electroacoustic transducer described in the utility model can reduce the product height, prevent that vibrating diaphragm and magnetic circuit system from bumping, thereby help the miniaturized design of product.
Description of drawings
Fig. 1 is the three-dimensional exploded view of the miniature moving-coil type electroacoustic transducer that relates to of first embodiment of the present utility model;
Fig. 2 is the cutaway view of the internal structure of the miniature moving-coil type electroacoustic transducer that relates to of described first embodiment of expression;
Fig. 3 is the stereogram of the diaphragm structure in the miniature moving-coil type electroacoustic transducer that relates to of described first embodiment of expression;
Fig. 4 is the stereogram of the flexible circuitry plate structure in the miniature moving-coil type electroacoustic transducer that relates to of described first embodiment of expression;
Fig. 5 is the cutaway view of the internal structure of the miniature moving-coil type electroacoustic transducer that relates to of expression second embodiment of the present utility model;
Fig. 6 is the cutaway view of the internal structure of the miniature moving-coil type electroacoustic transducer that relates to of expression the 3rd embodiment of the present utility model;
Fig. 7 is the cutaway view of the internal structure of the miniature moving-coil type electroacoustic transducer that relates to of expression the 4th embodiment of the present utility model;
Fig. 8 is the cutaway view of the internal structure of expression miniature moving-coil type electroacoustic transducer of the prior art.
Specific embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in detail.
In the following description, only some one exemplary embodiment of the present utility model has been described by the mode of explanation.Undoubtedly, those of ordinary skill in the art can recognize, under the situation that does not depart from spirit and scope of the present utility model, can revise described embodiment with various mode.Therefore, accompanying drawing is illustrative with being described in essence, rather than is used to limit the protection range of claim.In addition, in this manual, identical Reference numeral is represented identical part.
[first embodiment]
Fig. 1 is the three-dimensional exploded view of the miniature moving-coil type electroacoustic transducer that relates to of first embodiment of the present utility model.Fig. 2 is the cutaway view of the internal structure of this miniature moving-coil type electroacoustic transducer of expression.
As depicted in figs. 1 and 2, the miniature moving-coil type electroacoustic transducer that relates to of first embodiment of the present utility model comprises shell 4, magnetic circuit system and vibrational system.The rectangular frame that shell 4 is to use for example resin, plastics etc. to make is provided with brace groove and communication groove so that described magnetic circuit system to be installed at Qi Bishang.
Described magnetic circuit system comprises magnetic conductive board 311, inner magnet 321, the first outer magnetic conductive board 312, outer magnet 322 and second magnetic conductive board 33 in first for the two magnetic route structure of big magnetic force can be provided.Wherein, inner magnet 321 is rectangular shapes, and the first interior magnetic conductive board 311 is and inner magnet 321 corresponding rectangles, and both external dimensions are identical.Outer magnet 322 is annular rectangular shapes, the first outer magnetic conductive board 312 is and outer magnet 322 corresponding annulars, and both external dimensions are identical, in addition, the periphery of the first outer magnetic conductive board 312 is provided with the tenon structure, be used for combining, thereby the first outer magnetic conductive board 312 is supported with described brace groove on the shell 4.Inner magnet 321 can be configured in the outer magnet 322, and inner magnet 321 is identical with the thickness of outer magnet 322, and the first interior magnetic conductive board 311 is identical with the thickness of the first outer magnetic conductive board 312.In addition, second magnetic conductive board 33 is rectangular member, is provided with tenon structure and recessed structures in its periphery, and this tenon structure combines with brace groove on the shell 4, thereby second magnetic conductive board 33 is supported; This recessed structures then with shell 4 on the corresponding combination of communication groove and reserve certain hole, the two formed hole can be used as the ventilation harmony hole of back cavity.In this implementation process, fix by a glue between the periphery tenon of the periphery tenon structure of magnetic conductive board 312, second magnetic conductive board 33 and the brace groove on recessed structures and the shell 4 outside preferred first.
Magnetic conductive board 311, inner magnet 321, the first outer magnetic conductive board 312 and outer magnet 322 combine by top-down order among the figure and second magnetic conductive board, 33 gummeds in first.Wherein, the first outer magnetic conductive board 312 and outer magnet 322 are respectively around magnetic conductive board 311 in first with inner magnet 321 is provided with and across predetermined gap well-balancedly, but the first outer magnetic conductive board 312 and outer magnet 322 together and in first magnetic conductive board 311 and inner magnet 321 on second magnetic conductive board 33, form magnetic conduction together respectively and can make the outer process and the inner process of flux closure, the annular gap between described outer process and the inner process then forms the magnetic gap in the described miniature moving-coil type electroacoustic transducer.
Described vibrational system comprises vibrating diaphragm 1 and the actuator that is made of the flexible circuit board 2 that is installed on the vibrating diaphragm 1.Wherein, the marginal portion of vibrating diaphragm 1 is fixed on the first outer magnetic conductive board 312, the core of vibrating diaphragm 1 is fixed in first on the magnetic conductive board 311, flexible circuit board 2 then be fixed on vibrating diaphragm 1 on the lower surface of the coupling part between described marginal portion and the core.Flexible circuit board 2 is provided with certain circuit configuration, and therefore, flexible circuit board 2 can be stressed in the magnetic gap of described magnetic circuit system, thereby drives vibrating diaphragm 1 vibration.
Fig. 3 is the stereogram of the structure of expression vibrating diaphragm 1.As shown in Figure 3, vibrating diaphragm 1 is a planar structure, comprise with the edge part 11 of first outer magnetic conductive board 312 secure bond, with first in magnetic conductive board 311 secure bond central part 13 and between edge part 11 and central part 13 and the connecting portion 12 that is connected with its one, wherein, the height of connecting portion 12 is lower than edge part 11 and central part 13, so that vibrating diaphragm 1 utilizes the space in the magnetic gap more when vibration, thereby help reducing the product height of miniature moving-coil type electroacoustic transducer.
Fig. 4 is the stereogram of the structure of expression flexible circuit board 2.As shown in Figure 4, the surface of flexible circuit board 2 is provided with conductive coating 21, and conductive coating 21 is linearity on flexible circuit board 2 arranges and form force-applied coil, thereby makes flexible circuit board 2 become actuator.This design can realize by technologies such as corrosion.Flexible circuit board 2 is a planar structure, and its thickness is thinner than traditional design, is beneficial to the miniaturized design of miniature moving-coil type electroacoustic transducer.
In the present embodiment, because the central part 13 of vibrating diaphragm 1 is fixed on the first interior magnetic conductive board 311, and the connecting portion 12 of the vibrating diaphragm 1 relevant with vibration has utilized the space in the magnetic gap fully, thereby avoided the inner process of vibrational system and magnetic circuit system in the traditional structure to bump and produced the problem of noise, therefore can reduce the height of product, realize ultra-thinization of product.
In the present embodiment, described actuator preferably adopts flexible circuit board 2, also the structural member that can adopt other to have high resiliency and be provided with the conducting wire; The shell 4 preferred plastic materials that adopt are made, and its shape is preferably rectangle, also can be other shape; Magnetic circuit gap width in this implementation process also can be adjusted by default, and effective vibration area of the size of corresponding driving part and vibrating diaphragm also can be adjusted and be changed, to satisfy in the actual production different product size and performance requirement thereof.
[second embodiment]
The concrete structure of the miniature moving-coil type electroacoustic transducer that second embodiment of the present utility model relates to is described with reference to Fig. 5 below.
Fig. 5 is the cutaway view of the internal structure of the miniature moving-coil type electroacoustic transducer that relates to of expression second embodiment of the present utility model.As shown in Figure 5, the difference of present embodiment and described first embodiment is that in the present embodiment, magnetic circuit system is the external magnetic circuit structure.In described external magnetic circuit structure, second magnetic conductive board 33 ' forms projection in the central, substitute magnetic conductive board 311 and inner magnet 321 in first among described first embodiment, constituted the inner process in the external magnetic circuit structure, be provided with well-balancedly and then constituted outer process in the external magnetic circuit structure across first magnetic conductive board 31 in predetermined gap and magnet 32 around the described central protrusion of second magnetic conductive board 33 '.
As shown in Figure 5, in the present embodiment, the edge part 11 of vibrating diaphragm is fixed on first magnetic conductive board 31, and the central part 13 of vibrating diaphragm is fixed on the described central protrusion of second magnetic conductive board 33 ', and 2 of flexible circuit board are fixed on the lower surface of connecting portion 12 of vibrating diaphragm.Shell 4 forms the framework of miniature moving-coil type electroacoustic transducer.
In addition, other structure of present embodiment is identical with described first embodiment's, so omit its description.
According to said structure, present embodiment can be realized the technique effect of first embodiment equally, and compares with first embodiment, and the improvement design in the present embodiment helps to produce the products with different structure and performance more, to satisfy actual needs.
[the 3rd embodiment]
The concrete structure of the miniature moving-coil type electroacoustic transducer that the 3rd embodiment of the present utility model relates to is described with reference to Fig. 6 below.
Fig. 6 is the cutaway view of the internal structure of the miniature moving-coil type electroacoustic transducer that relates to of expression the 3rd embodiment of the present utility model.As shown in Figure 6, the difference of present embodiment and described first embodiment is that in the present embodiment, magnetic circuit system is the internal magnetic circuit structure.In described internal magnetic circuit structure, second magnetic conductive board 33 " the edge upwards be bent to form sidewall; this sidewall substitutes first outer magnetic conductive board 312 and the outer magnet 322 among described first embodiment; constituted the outer process in the internal magnetic circuit structure, combines and is arranged in second magnetic conductive board 33 by top-down order among the figure " first magnetic conductive board 31 of central authorities and the inner process that magnet 32 then constitutes the internal magnetic circuit structure.
As shown in Figure 5, in the present embodiment, the edge part 11 of vibrating diaphragm is fixed on second magnetic conductive board 33 " sidewall on, the central part 13 of vibrating diaphragm is fixed on first magnetic conductive board 31,2 of flexible circuit board are fixed on the lower surface of connecting portion 12 of vibrating diaphragm.Shell 4 forms the framework of miniature moving-coil type electroacoustic transducer.
In addition, other structure of present embodiment is identical with described first embodiment's, so omit its description.
According to said structure, present embodiment can be realized the technique effect of first embodiment equally, and compares with first embodiment, and the improvement design in the present embodiment helps to produce the products with different structure and performance more, to satisfy actual needs.
[the 4th embodiment]
The concrete structure of the miniature moving-coil type electroacoustic transducer that the 4th embodiment of the present utility model relates to is described with reference to Fig. 7 below.
Fig. 7 is the cutaway view of the internal structure of the miniature moving-coil type electroacoustic transducer that relates to of expression the 4th embodiment of the present utility model.As shown in Figure 7, the difference of present embodiment and the foregoing description is, in the present embodiment, the actuator in the described vibrational system is voice coil loudspeaker voice coil 2 ' independently.Voice coil loudspeaker voice coil 2 ' is fixed on the lower surface of connecting portion 12 of vibrating diaphragm, as the actuator that drives the vibrating diaphragm vibration.The voice coil loudspeaker voice coil of preferred voice coil loudspeaker voice coil 2 ' for having flat structure can increase the oscillation space of voice coil loudspeaker voice coil 2 ' like this, thereby help the miniaturized design of product.
In addition, other structure of present embodiment is identical with the foregoing description, so omit its description.
According to said structure, present embodiment can be realized the technique effect of the foregoing description equally, and compares with the foregoing description, and the improvement design in the present embodiment helps to produce the products with different structure and performance more, to satisfy actual needs.
Should be noted that those of skill in the art can carry out various improvement, distortion and combination on the basis of the foregoing description, and these improvement, distortion and combination are also all within protection range of the present utility model.Should be understood that above-mentioned specific descriptions just are used for illustrating the utility model, protection range of the present utility model is limited by appended claims and equivalent thereof.
Claims (10)
1. a miniature moving-coil type electroacoustic transducer comprises shell, is arranged on magnetic circuit system and vibrational system in the described shell; Described magnetic circuit system comprises first magnetic conductive board, magnet and second magnetic conductive board that is configured in the described shell, described first magnetic conductive board, magnet and second magnetic conductive board form the outer process of ring-type and are positioned at the inner process of described outer process inboard across predetermined distance, form the magnetic gap of described miniature moving-coil type electroacoustic transducer between described outer process and the inner process; Described vibrational system comprises vibrating diaphragm and the actuator that combines and be electrically connected with external circuit with described vibrating diaphragm; It is characterized in that,
Described vibrating diaphragm comprise central part, edge part and with the airtight connecting portion that is connected of described central part and edge part one, the central part of described vibrating diaphragm is fixed on the inner process of described magnetic circuit system.
2. miniature moving-coil type electroacoustic transducer as claimed in claim 1 is characterized in that,
The edge part of described vibrating diaphragm is fixed on the outer process of described magnetic circuit system or is fixed on the shell.
3. miniature moving-coil type electroacoustic transducer as claimed in claim 2 is characterized in that,
Described actuator is fixed on the lower surface of connecting portion of described vibrating diaphragm, and is in the magnetic gap of described magnetic circuit system.
4. miniature moving-coil type electroacoustic transducer as claimed in claim 3 is characterized in that,
Described vibrating diaphragm is a plane diaphragm, and the height of the connecting portion of described vibrating diaphragm is lower than the height of the central part of described vibrating diaphragm.
5. miniature moving-coil type electroacoustic transducer as claimed in claim 4 is characterized in that,
Described actuator is a flexible circuit board, and described flexible circuit board is provided with conductive coating, and described conductive coating forms coil on described flexible circuit board, make described actuator can be in described magnetic gap forced vibration.
6. miniature moving-coil type electroacoustic transducer as claimed in claim 5 is characterized in that,
Make the conductive coating on the described flexible circuit board form coil by caustic solution.
7. miniature moving-coil type electroacoustic transducer as claimed in claim 4 is characterized in that,
Described actuator is voice coil loudspeaker voice coil independently.
8. as the described miniature moving-coil type electroacoustic transducer of arbitrary claim among the claim 1-7, it is characterized in that,
Described magnetic circuit system is a two magnetic route structure, described first magnetic conductive board comprises the magnetic conductive board and the first outer magnetic conductive board in first, described magnet comprises inner magnet and outer magnet, in described first magnetic conductive board and inner magnet together and the described first outer magnetic conductive board and outer magnet form the inner process and the outer process of described magnetic circuit system together respectively.
9. as the described miniature moving-coil type electroacoustic transducer of arbitrary claim among the claim 1-7, it is characterized in that,
Described magnetic circuit system is the external magnetic circuit structure, described second magnetic conductive board forms projection in the central as the inner process in the external magnetic circuit structure, is provided with well-balancedly and has then constituted outer process in the external magnetic circuit structure across first magnetic conductive board in predetermined gap and magnet around the described inner process of described second magnetic conductive board.
10. as the described miniature moving-coil type electroacoustic transducer of arbitrary claim among the claim 1-7, it is characterized in that,
Described magnetic circuit system is the internal magnetic circuit structure, and the edge of described second magnetic conductive board upwards is bent to form sidewall as the outer process in the internal magnetic circuit structure, is arranged in first magnetic conductive board of the described second magnetic conductive board central authorities and the inner process that magnet constitutes the internal magnetic circuit structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202796535U CN201839420U (en) | 2010-07-30 | 2010-07-30 | Miniature moving coil type electroacoustic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202796535U CN201839420U (en) | 2010-07-30 | 2010-07-30 | Miniature moving coil type electroacoustic transducer |
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| Publication Number | Publication Date |
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| CN201839420U true CN201839420U (en) | 2011-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010202796535U Expired - Lifetime CN201839420U (en) | 2010-07-30 | 2010-07-30 | Miniature moving coil type electroacoustic transducer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102348153A (en) * | 2010-07-30 | 2012-02-08 | 歌尔声学股份有限公司 | Micro moving-coil type electro-acoustic converter |
| CN102497611A (en) * | 2011-12-23 | 2012-06-13 | 深圳市韶音科技有限公司 | Bone conduction speaker driver with reduced volume |
-
2010
- 2010-07-30 CN CN2010202796535U patent/CN201839420U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102348153A (en) * | 2010-07-30 | 2012-02-08 | 歌尔声学股份有限公司 | Micro moving-coil type electro-acoustic converter |
| CN102348153B (en) * | 2010-07-30 | 2014-01-29 | 歌尔声学股份有限公司 | Micro moving-coil type electro-acoustic converter |
| CN102497611A (en) * | 2011-12-23 | 2012-06-13 | 深圳市韶音科技有限公司 | Bone conduction speaker driver with reduced volume |
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| C14 | Grant of patent or utility model | ||
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Address after: 261031 Dongfang Road, Weifang high tech Industrial Development Zone, Shandong, China, No. 268 Patentee after: Goertek Inc. Address before: 261031 Dongfang Road, Weifang high tech Industrial Development Zone, Shandong, China, No. 268 Patentee before: Goertek Inc. |
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| CX01 | Expiry of patent term |
Granted publication date: 20110518 |
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| CX01 | Expiry of patent term |