CN201274564Y

CN201274564Y - Capacitive microphone

Info

Publication number: CN201274564Y
Application number: CNU200820147225XU
Authority: CN
Inventors: 潘旭东
Original assignee: AAC Acoustic Technologies Shenzhen Co Ltd
Current assignee: AAC Technologies Holdings Shenzhen Co Ltd; AAC Technologies Holdings Changzhou Co Ltd
Priority date: 2008-09-05
Filing date: 2008-09-05
Publication date: 2009-07-15
Anticipated expiration: 2018-09-05

Abstract

The utility model discloses a capacitor-type microphone, which mainly includes a sell, a vibrating diaphragm group that is accommodated inside the shell, a gasket that is arranged on the vibrating diaphragm group, a back pole seat that is adjacent to the gasket, a back pole plate that is embedded inside the back pole seat, a connection ring and a circuit board that is electrically connected with the shell, and is characterized in that the connection ring is provided with a soleplate that is opposite to the back pole plate, and the soleplate is provided with a through groove. For the connection ring has the damping effect, the connection ring substitutes the tuning paper in the prior art, so that the microphone has good consistence, and simplifies the assembling, thereby being convenient to be automatically assembled.

Description

Electret Condencer Microphone

Technical field

The utility model relates to a kind of microphone, relates in particular to a kind of Electret Condencer 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.The user is more and more higher to the requirement of mobile phone, and how the element on it as microphone, improves its sensitivity and consistency, becomes important problem.Microphone commonly used at present mainly contains Electret Condencer Microphone and MEMS (Micro-Electro-Mechanical-Systems, microelectromechanical-systems) microphone, and Electret Condencer Microphone is comparatively extensive because of application with low cost, and Electret Condencer Microphone is a kind of in the Electret Condencer Microphone.

Existing Electret Condencer Microphone as shown in Figure 1, be back pole plate 1 ' towards circuit board 2 ' the surface paste adjustable sound paper 3 ', but because different supplier, even adjustable sound paper widely different between same supplier's the different batches, cause consistency of product poor, and be not suitable for the automation assembling.

The utility model content

The purpose of this utility model is to provide a kind of high conformity, is convenient to the Electret Condencer Microphone of assembling automatically.

For reaching above-mentioned technical purpose, the technical solution of the utility model is:

A kind of Electret Condencer Microphone, it mainly comprises shell, be contained in vibrating diaphragm group in the shell, be positioned over pad on the vibrating diaphragm group, with the back-pole base of pad adjacency, be embedded at back pole plate, connecting ring in the back-pole base and the circuit board that electrically connects with shell, it is characterized in that: described connecting ring is provided with a base plate relative with back pole plate, and base plate is provided with groove.

Preferably, also be provided with the groove of cutting sth. askew on the described base plate, this groove of cutting sth. askew communicates with described groove.

Preferably, described connecting ring is a toroidal.

The beneficial effects of the utility model are that because described connecting ring is provided with a base plate, base plate is provided with groove, has played the effect of damping, so the high conformity of microphone has been simplified assembling simultaneously, are convenient to the automation assembling.

Description of drawings

Fig. 1 is the structure of Electret Condencer Microphone in the prior art;

Fig. 2 is the three-dimensional exploded view of the Electret Condencer Microphone that provides of the utility model;

Fig. 3 is the profile of the Electret Condencer Microphone that provides of the utility model;

Fig. 4 is the schematic diagram of the Electret Condencer Microphone connecting ring that provides of the utility model.

Embodiment

Below in conjunction with accompanying drawing the utility model is described further.

As Fig. 2, Fig. 3, shown in Figure 4, the Electret Condencer Microphone that the utility model provides, comprise shell 1, be contained in vibrating diaphragm group 2 in the shell 1, be positioned over pad 3 on the vibrating diaphragm group 2, with the back-pole base 5 of pad 3 adjacency, the circuit board 7 that is embedded at back pole plate 4 in the back-pole base 5 and connecting ring 6 and electrically connects with shell 1.Vibrating diaphragm group 2 comprises stretch tight zona 21 and the vibrating diaphragm sheet 22 that places in the zona 21 that stretches tight.

The connecting ring 6 of this Electret Condencer Microphone is provided with a base plate 8 relative with back-pole base 5, and base plate 8 is provided with groove 81.In the preferred embodiment that the utility model provides, groove 81 is two, is respectively first groove 811 and second groove 812.

Also be provided with the groove 82 of cutting sth. askew on the base plate 8, this groove 82 of cutting sth. askew communicates with groove 83.The effect of the groove 81 and the groove 82 of cutting sth. askew is retardance circulations of air.

Certainly, groove 81 is not limited to 2, and the groove 82 of cutting sth. askew also is not limited to 1, as long as can reach the purpose of retardance circulation of air.

Shell 1 can adopt different shape (for example cup-shaped, rectangle, D shape shape or trapezoidal shape), shell 1 can be made by a plurality of alternating layers of electric conducting material and non-conducting material, perhaps can on the non-conductive layer inboard, apply conductive coating, vibrating diaphragm group 2 can be electrically connected on the circuit board 7.

Though the shape of vibrating diaphragm group 2 is corresponding with the shape of shell 1 in the present embodiment, in different execution modes, can adopt multiple shape, vibrating diaphragm group 2 that size is different.The flat coating that contacts with pad 3 of vibrating diaphragm group 2 has layer of conductive material (as chromium) to form the conductivity live part, is commonly referred to movable electrode, and this movable electrode and pad 3 keep in touch.

Pad 3 is used to make vibrating diaphragm group 2 and other element electricity in the shell 1 to isolate.Pad 3 is made by electrical insulating material, has the thickness that equals spacing between vibrating diaphragm group 2 and the back pole plate 4.Pad 3 makes that vibrating diaphragm group 2 can be towards back pole plate 4 distortion.Pad 3 can have multiple shape, and needn't be corresponding with shell 1 shape, and can have multiple different size.In the present embodiment, pad 3 is corresponding round-shaped with shell 1.

Has the electrifying film (not shown) on the back pole plate 4.

Back-pole base 5 can be made multiple shape and size to adapt to the needs of application.Back-pole base 5 is made for cylindrical shape and by electrical insulating material such as plastics, rubber, silica gel in the present embodiment.

Connecting ring 6 is circular, and this connecting ring 6 also can take different shapes according to different performances and size.

The matching relationship of above-mentioned each element is as follows:

Electrifying film is set on the back pole plate 4 and is seated on the back-pole base 5, be electrically connected to connecting ring 6 simultaneously, like this, back pole plate 4 has just electrically connected with circuit board; Pad 3 is between back pole plate 4 and vibrating diaphragm group 2, in order to form the gap between back pole plate 4 and vibrating diaphragm group 2; Vibrating diaphragm group 2 places pad 3 times, and is housed in the shell 1 and electrically conducts with shell 1; Shell 1 is electrically connected on the corresponding circuits of circuit board.

Such matching relationship, make vibrating diaphragm group 2 be electrically connected to circuit board, back pole plate 4 also is electrically connected to circuit board, and still two circuit are because of directly conducting of the gap that forms between back pole plate 4 and the vibrating diaphragm group 2, and back pole plate 4 has just formed capacitance body with vibrating diaphragm group 2.

Have electrifying film on the back pole plate 4, electrifying film is a kind of dielectric 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 electrifying film.Owing to be distributed with free charge on the electrifying film, so between the two poles of the earth of the capacitor that forms between vibrating diaphragm group 2 and the back pole plate 4, the quantity of electric charge has just been arranged, when sound wave makes vibrating diaphragm group 2 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.

Compared with prior art, because connecting ring 6 is provided with base plate 8, base plate 8 is provided with groove 81, has played the effect of damping, so the high conformity of Electret Condencer Microphone has been simplified assembling simultaneously, is convenient to the automation assembling.

Owing to also be provided with the groove 82 of cutting sth. askew on the base plate 8, so further improved the consistency of Electret Condencer Microphone.

The above only is a better embodiment of the present utility model; 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, a kind of Electret Condencer Microphone, it mainly comprises shell, be contained in vibrating diaphragm group in the shell, be positioned over pad on the vibrating diaphragm group, with the back-pole base of pad adjacency, be embedded at back pole plate, connecting ring in the back-pole base and the circuit board that electrically connects with shell, it is characterized in that: described connecting ring is provided with a base plate relative with back pole plate, and base plate is provided with groove.

2, Electret Condencer Microphone as claimed in claim 1 is characterized in that, also is provided with the groove of cutting sth. askew on the described base plate, and this groove of cutting sth. askew communicates with described groove.

3, Electret Condencer Microphone as claimed in claim 1 is characterized in that, described connecting ring is a toroidal.