CN201054789Y

CN201054789Y - Electrete microphone

Info

Publication number: CN201054789Y
Application number: CNU2007201210394U
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 an upper cover, an electret, a membrane group, a spacer positioned between the electret and the membrane group and a lower cover. The lower cover is provided with a circuit bottom board and a side wall extending upward from the circuit bottom board, and the circuit bottom board and the side wall are surrounded into a cavity for containing the elements. The spacer is separated the electret from the membrane to form an air chamber; the membrane group is communicated to a circuit board in virtue of an electronic element arranged on the circuit bottom board, and the electret is communicated to the circuit bottom board through a conductive path arranged on the lower cover; but the electret is insulated from the membrane group. Consequently, the capacitance effect can be achieved between the electret and the membrane group via the communication. The electret and the membrane group of the utility model use the electronic elements or a conductive path on the lower cover together to form a circuit with capacitance effect, 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 miniaturization 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 by insulating between dead ring 15 and the 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 electret, diaphragm group, pad and lower cover between electret and diaphragm group, under be covered with circuit substrate and by the upwardly extending sidewall of circuit substrate, electret and diaphragm group electrically connect conductive path on sidewall and the circuit substrate respectively to form the circuit of tool capacity effect.

As a kind of improvement of the utility model electret microphone, this electret microphone also comprises loam cake, and electret, diaphragm group and pad are contained in the receiving space of loam cake and lower cover formation.

Another kind as the utility model electret microphone improves, and the encapsulation of this electret microphone is shaped as cylinder.

Another kind as the utility model electret microphone improves, and the encapsulation of this electret microphone is shaped as cuboid.

Another kind as the utility model electret microphone improves, and stretching out on the sidewall of lower cover is provided with projection in order to distinguish the installation site of microphone.

Compared with prior art, the utlity model has following advantage: save connecting ring of the prior art and dead ring, 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 solid combination schematic diagram of the utility model electret microphone;

Fig. 4 is the reverse view of Fig. 3;

Fig. 5 is the three-dimensional combination figure of the another kind of execution mode of the utility model electret microphone;

Fig. 6 is the reverse view of Fig. 5.

[embodiment]

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

Please join Fig. 2 to Fig. 4:

The utility model electret microphone 20 mainly comprises loam cake 21, electret 22, pad 23, and diaphragm group 24 and lower cover 25 that by pad 23 separated relative with electret 22.Diaphragm group 24 comprises diaphragm 241 and the diaphragm ring 242 that supports diaphragm 241.

Lower cover 25 is provided with circuit substrate 251, be furnished with electronic component 254 and other conductive paths on it, extend upward by circuit substrate 251 and to be provided with sidewall 252, be provided with conductive path on the sidewall 252 equally, circuit substrate 251 encloses with sidewall 252 and forms cavity volume 253, and stretching out on the sidewall 252 is provided with projection 255.

Diaphragm group 24 is electrically connected to circuit substrate 251 by electronic component on the circuit substrate 251 254 or conductive path, and electret 22 also is electrically connected to circuit substrate 251 by the conductive path on the sidewall 252 of lower cover 25, but two not short circuits of conductive path.And separate not conducting by pad 23 between diaphragm group 24 and the electret 22, by above-mentioned electrical connection and not conducting relation, had the basic framework of capacity effect between diaphragm group 24 and the electret 22.

Electret 22 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 22.Owing to be distributed with free charge on the electret 22, so the quantity of electric charge has just been arranged between the two poles of the earth of capacitor, when sound wave makes diaphragm 241 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, electret 22 and diaphragm group 24 utilize conductive path on the lower cover 25 as the two poles of the earth of electric capacity jointly, economize except connecting ring of the prior art and dead ring, and designs simplification, and can reduce the volume of microphone.

Electret microphone 20 encapsulation of present embodiment are shaped as cylinder, (specifically joining Fig. 4) is provided with plurality of conducting strips 256 in order to be electrically connected to external circuit in the bottom side of circuit substrate 251, the setting of above-mentioned projection 255 promptly is in order to distinguish the direction of installation when microphone 20 is welded to external circuit, prevents the corresponding contact dislocation with external circuit of conducting strip 256.

Fig. 5 and Fig. 6 are the another kind of execution mode of the utility model electret microphone, in the present embodiment, the encapsulation of electret microphone 30 is shaped as cuboid, and element composition and position relation or matching relationship are identical with a last execution mode, equally except connecting ring of the prior art and dead ring.

As cuboid, itself has had the identity of installation direction, but projection can be set equally to strengthen recognition effect (not shown, but the description by a last execution mode can be understood its concrete structure and effect).

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 is characterized in that: this electret microphone mainly comprises electret, diaphragm group, pad and lower cover between electret and diaphragm group, under be covered with circuit substrate and by the upwardly extending sidewall of circuit substrate, electret and diaphragm group electrically connect conductive path on sidewall and the circuit substrate respectively to form the circuit of tool capacity effect.

2. electret microphone as claimed in claim 1 is characterized in that: this electret microphone also comprises loam cake, and electret, diaphragm group and pad are contained in the receiving space of loam cake and lower cover formation.

3. electret microphone as claimed in claim 1 is characterized in that: the encapsulation of this electret microphone is shaped as cylinder.

4. electret microphone as claimed in claim 1 is characterized in that: the encapsulation of this electret microphone is shaped as cuboid.

5. as each described electret microphone in the claim 1 to 4, it is characterized in that: stretching out on the sidewall of lower cover is provided with projection in order to distinguish the position of microphone.