CN201226591Y

CN201226591Y - Capacitance type microphone

Info

Publication number: CN201226591Y
Application number: CNU2008200953021U
Authority: CN
Inventors: 潘政民; 王云龙; 孟珍奎
Original assignee: AAC Acoustic Technologies Shenzhen Co Ltd
Current assignee: AAC Technologies Holdings Shenzhen Co Ltd
Priority date: 2008-07-04
Filing date: 2008-07-04
Publication date: 2009-04-22
Anticipated expiration: 2018-07-04

Abstract

The utility model relates to a capacitive microphone, in particular to a micro-electro-mechanical system (Micro-Electro-Machanicl-System, referred to as MEMS) microphone, which includes a back plate and a vibrating membrane opposite to the back plate, wherein an acoustic microphone is set on the back plate. A hole through which sound can be transmitted to the diaphragm causing the diaphragm to vibrate. The condenser microphone is also provided with a dust-proof part integrated or separated from the backboard, and a number of fine holes are arranged on the dust-proof part to communicate with the sound hole.

Description

Electret Condencer Microphone

[technical field]

The utility model relates to Electret Condencer Microphone, relates in particular to a kind of microelectromechanical-systems 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.

And the microphone of using more and better performances at present is microelectromechanical-systems microphone (Micro-Electro-Mechanical-System Microphone is called for short MEMS), and its encapsulation volume is littler than traditional electret microphone.Yet the inner components and parts of MEMS microphone as dust, can influence its acoustical behavior if be subjected to external contamination, such as desensitization, even the dust inner components and parts that can wear and tear.

As shown in Figure 1, be a kind of microphone cross-sectional schematic relevant with the utility model.This microphone 10 comprises backboard 11, vibrating diaphragm 12 relative with backboard 11 and that be connected by support portion 121, vibrating diaphragm 12 is backboard 11 up-down vibration relatively, backboard 11 is provided with hole 111 in addition, and this hole 111 can be delivered to the sound air-flow on the vibrating diaphragm 12 and cause vibrating diaphragm 12 vibrations.

Yet this hole 111 is included with dust easily, and dust is fallen on the vibrating diaphragm 12, can cause the vibration performance change, influences microphone property.

But the utility model then provides a kind of new dustproof Electret Condencer Microphone.

[utility model content]

The technical problems to be solved in the utility model is to provide a kind of new Electret Condencer Microphone, and this microphone can stop dust to enter.

The utility model solves above-mentioned technical problem by such technical scheme:

A kind of Electret Condencer Microphone, mainly comprise: backboard and the vibrating diaphragm that is oppositely arranged with backboard, backboard is provided with the sound hole that the sound air-flow can be delivered to vibrating diaphragm, this Electret Condencer Microphone is provided with dustproof portion in addition, and this dustproof portion partially filled sound hole also is provided with and some the connection also with sound hole gas can stops dust granule to advance the pore of tone-entering hole.

Compared with prior art, the utlity model has following advantage: dustproof portion is set in the position in backboard sound hole, and dustproof portion is provided with the pore that is communicated with the sound hole, these pores allow air draught to pass through, but stop entering of dust.

[description of drawings]

Fig. 1 is the microphone cross-sectional schematic relevant with the utility model.

Fig. 2 is the cross-sectional schematic of the utility model Electret Condencer Microphone.

[embodiment]

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

The utility model Electret Condencer Microphone is mainly used on the mobile phone, accepts sound and sound is converted into the signal of telecommunication.

Please join Fig. 2, Electret Condencer Microphone 20, the vibrating diaphragm 22 that mainly comprises backboard 21, is oppositely arranged with backboard 21, vibrating diaphragm 22 is connected on the backboard 21 by the support portion 221 with vibrating diaphragm one or split, being respectively equipped with conductive layer on vibrating diaphragm 22 and the backboard 21 also can power up, but the part mutually insulated that powers up, like this, vibrating diaphragm 22 has just been formed the capacitor with electric capacity with backboard 21.

Backboard 21 is provided with hole 211, and the sound air-flow can be delivered on the vibrating diaphragm 22 by this hole 211, and causes vibrating diaphragm 22 up-down vibration.

Because form capacitor between vibrating diaphragm 22 and the backboard 21, when vibrating diaphragm 22 vibrations, distance between the two changes, and causes capacitance to change, and the variation that electric capacity takes place has then produced electric current, thereby converts tones into the signal of telecommunication.

Backboard 21 is provided with the dustproof portion 212 with backboard 21 one or split in addition, be somebody's turn to do dustproof portion 212 filling part sound holes 211, be delivered on the vibrating diaphragm 22 for ease of the sound air-flow, dustproof portion 212 is provided with some pores 213, the sound air-flow can be delivered to hole 211 and arrive vibrating diaphragm 22 by these pores 213, and dust granule is then stoped outside by pore 213.

For stopping most of dust granule, pore 213 diameters are set between 0.02～0.08mm.

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 capacitive microphone, mainly comprising: a back plate and a vibrating membrane set relative to the back plate, the back plate is provided with a sound hole that can transmit sound airflow to the vibrating film, it is characterized in that: the capacitive microphone is additionally provided with There is a dust-proof part, which partially fills the sound hole and is provided with a plurality of fine holes that are gas-communicated with the sound hole and can prevent dust particles from entering the sound hole.

2. The condenser microphone according to claim 1, wherein the diameter of the pores is 0.02mm-0.08mm.

3. The condenser microphone according to claim 1 or 2, wherein the dust-proof part is a part of the back plate.