CN201054788Y

CN201054788Y - Electrete microphone

Info

Publication number: CN201054788Y
Application number: CNU200720121038XU
Authority: CN
Inventors: 潘政民; 周成军
Original assignee: AAC Acoustic Technologies Shenzhen Co Ltd
Current assignee: AAC Technologies Holdings Shenzhen Co Ltd
Priority date: 2007-06-21
Filing date: 2007-06-21
Publication date: 2008-04-30
Anticipated expiration: 2017-06-21

Abstract

The utility model relates to an electret microphone, which comprises a cover body, a membrane group contained in the cover body, an electret, a spacer positioned between the membrane group and the electret, an insulation ring containing the electrets, and a circuit board. The inner wall and the side wall of the insulation ring are provided with a conductive coating. The spacer separates the electret from the membrane group to form an air chamber; the membrane group is communicated to a circuit board in virtue of the cover body, and the electret is also communicated to the circuit board through the conductive coating of the insulation ring; but the electret is insulated with the membrane group. Consequently, the capacitance effect can be achieved between the electret and the membrane group via the communication. The utility model is directly disposed the conductive coating on the insulation ring containing the electret, thereby simplifying the structure of the microphone, saving the cost, being convenient to be assembled, and further realizing the micromation.

Description

Electret microphone

[technical field]

The utility model relates to a kind of microphone, relates in particular to a kind of electret microphone.

[background technology]

Development along with wireless telecommunications, Global Mobile Phone Users is more and more, the user not only is satisfied with conversation to the requirement of mobile phone, and want high-quality communication effect can be provided, especially at present the development of mobile multimedia technology, the speech quality of mobile phone becomes more important, and the microphone of mobile phone is as the voice pick device of mobile phone, and its design quality directly influences speech quality.In addition, more and more to the microminiaturization development, how the element on it as microphone, still can keep superperformance to mobile phone in ever-reduced volume, really be important problem.

Microphone at present commonly used mainly contains Electret Condencer Microphone and MEMS (microelectromechanical-systems) microphone, and Electret Condencer Microphone is comparatively extensive because of application with low cost, and main flow is electret microphone in the Electret Condencer Microphone.

Fig. 1 has shown a kind of structure of the existing electret microphone relevant with the utility model.This existing electret microphone 10 mainly comprises lid 11, be contained in diaphragm group 12 in the lid 11, pad 13, and electret 14 that by pad 13 separated relative with diaphragm group 12, the dead ring 15 in order to accommodate electret 14, the connecting ring 16 and the circuit board 17 of electric connection electret 14.Lid 11 is provided with continuant orifice 110 to accept outside sound source, and diaphragm group 12 comprises diaphragm 121 and the diaphragm ring 122 that supports diaphragm 121.Diaphragm ring 122 electrically connects by lid 11 and circuit board, and electret 14 is followed insulation between the lid 11 by dead ring 15 and diaphragm group 12, and is connected in circuit board 17 by connecting ring 16.Therefore, by above-mentioned electrical connection, can realize capacity effect between electret 14 and the diaphragm group 12.After outside sound source entered lid 11, diaphragm group 12 was vibrated and is caused the distance between itself and the electret 14 to change, and then causes capacitance between the two to change, and causes that electric current changes, thereby sound wave is converted to the signal of telecommunication.

Yet, constantly reducing at mobile phone under the situation of volume, existing microphone structure is comparatively complicated, is unfavorable for that the volume of microphone reduces.

Therefore, be necessary to provide a kind of new electret microphone to overcome above-mentioned deficiency.

[utility model content]

The purpose of this utility model is to provide a kind of new electret microphone, and it can reduce the microphone volume, simplifies assembly program, improves packaging efficiency.

The purpose of this utility model is achieved in that a kind of electret microphone, mainly comprise lid, be housed in diaphragm group, electret, the pad between electret and diaphragm group, the dead ring of accommodating electret and circuit board in the lid, dead ring is provided with conductive coating in the position that connects electret and the position of connecting circuit plate, and two locational conductive coating mutual conduction.

As a kind of improvement of the utility model electret microphone, the inwall that dead ring contacts with electret is covered with conductive coating, and the sidewall that is connected with circuit board also is covered with conductive coating.

Another kind as the utility model electret microphone improves, and the inwall that dead ring contacts with electret selects several places to be provided with conductive coating, and the sidewall that is connected with circuit board selects several places that conductive coating is set.

Compared with prior art, the utlity model has following advantage: save connecting ring structure of the prior art, simplified the structure of microphone, simplified assembly program, and can reduce the microphone package volume, realized further microminiaturized.

[description of drawings]

Fig. 1 is a kind of perspective exploded view of existing electret microphone;

Fig. 2 is the perspective exploded view of the utility model electret microphone;

Fig. 3 is the another kind of execution mode of the dead ring of the utility model electret microphone.

[embodiment]

Describe the concrete structure of the utility model electret microphone in detail below in conjunction with accompanying drawing.

The utility model electret microphone 20 mainly comprises lid 21, be contained in diaphragm group 22 in the lid 21, pad 23, and electret 24 that by pad 23 separated relative with diaphragm group 22, dead ring 25 and the circuit board 26 in order to accommodate electret 24.Lid 21 is provided with continuant orifice 211 to accept outside sound source, and diaphragm group 22 comprises diaphragm 221 and the diaphragm ring 222 that supports diaphragm 221.Diaphragm ring 222 electrically connects by lid 21 and circuit board 26.

Dead ring 25 is provided with inwall 251 and is connected in the sidewall 252 of the inwall 251 (sidewall that only shows the top among the figure, in fact, the opposite side relative with the sidewall of top also has sidewall), inwall 251 and sidewall 252 are provided with conductive coating (dashed area among the figure), and electret 24 is housed in the dead ring 25 and by conductive coating and circuit board 26 and electrically connects.

Diaphragm group 22 is electrically connected by lid 21 with circuit board 26, electret 24 is electrically connected with circuit board 26 by conductive coating, and separate not conducting by pad 23 between diaphragm group 22 and the electret 24, by above-mentioned electrical connection and not conducting relation, had the basic framework of electric capacity between diaphragm group 22 and the electret 24.

Electret 24 is a kind of dielectrics that can keep the electric polarization state for a long time, and this dielectric is a kind of high molecular polymer, is distributed with free charge on the electret 24.Owing to be distributed with free charge on the electret 24, so the quantity of electric charge has just been arranged between the two poles of the earth of capacitor, when sound wave makes diaphragm 221 vibration and when producing displacement, changed the capacitance of capacitor, the change of capacitance makes the output of capacitor produce corresponding alternating electric field, just formed the signal of telecommunication corresponding, so just finished the function of acoustic-electric conversion with acoustic signals.

In the present embodiment, dead ring 25 inwalls 251 and sidewall 252 are provided with conductive coating, in order to electrically connect electret 24 to circuit board 26, compare prior art, economize except connecting ring, and designs simplification, and can reduce the volume of microphone.

Fig. 3 is the execution mode of another kind of dead ring.In this execution mode, the sidewall 252 ' of dead ring 25 ' is provided with conductive coating, and phase inwall 251 ' upward selects several places that conductive coating is set, but not whole inwall is all established conductive coating.In fact, sidewall 252 ' also can select several places that conductive coating is set.

Adopt this kind execution mode, compare an execution mode, except simplified structure, more can reduce the cost of coating.

In addition, one of character of electret can not be born excessive temperature, when the welding microphone is to mobile phone, the high temperature that produces can be delivered on the electret by the connecting ring or the conductive coating of the present utility model of prior art, might make temperature surpass the scope that electret may bear.But adopt conductive coating of the present utility model, can effectively control the transmission of temperature,, can select the not good conductive material of heat transfer property because the material of conductive coating can be selected voluntarily.Therefore, on the other hand, utilize conductive coating, can promote the resistance to elevated temperatures of microphone.

Available conductive coating is electrodeposition of metals, conducting resinl or the metal bisque (as silver powder layer etc.) of tool electric conductivity.

The utility model Figure of description is the schematic diagram of better embodiment only, and from figure, the encapsulation of microphone is shaped as circle, and in fact, the encapsulation shape of microphone also can be for square, and perhaps other shapes do not influence implementation result because of the encapsulation shape.

Above-mentioned only is the utility model better embodiment; protection range of the present utility model does not exceed with above-mentioned execution mode; as long as the equivalence that those of ordinary skills do according to the utility model institute disclosure is modified or changed, all should include in the protection range of putting down in writing in claims.

Claims

1. electret microphone, it mainly comprises lid, is housed in diaphragm group, electret, the pad between electret and diaphragm group, the dead ring of accommodating electret and circuit board in the lid, it is characterized in that: dead ring is provided with conductive coating in the position that connects electret and the position of connecting circuit plate, and two locational conductive coating mutual conduction.

2. electret microphone as claimed in claim 1 is characterized in that: the inwall that dead ring contacts with electret is covered with conductive coating, and the sidewall that is connected with circuit board also is covered with conductive coating.

3. electret microphone as claimed in claim 1 is characterized in that: the inwall that dead ring contacts with electret selects several places to be provided with conductive coating, and the sidewall that is connected with circuit board selects several places that conductive coating is set.