CN201491261U

CN201491261U - capacitance microphone

Info

Publication number: CN201491261U
Application number: CN200920132597XU
Authority: CN
Inventors: 刘明
Original assignee: AAC Acoustic Technologies Shenzhen Co Ltd; AAC Acoustic Technologies Changzhou Co Ltd
Current assignee: AAC Technologies Holdings Changzhou Co Ltd; AAC Technologies Pte Ltd
Priority date: 2009-06-05
Filing date: 2009-06-05
Publication date: 2010-05-26
Anticipated expiration: 2019-06-05

Abstract

The utility model provides a capacitance microphone comprising a circuit board, a frame connected with the circuit board and an upper plate connected with the frame, and the circuit board, the frame and the upper plate form a protection structure. The microphone also comprises a micro-electromechanical chip that is provided with a back cavity and is arranged in the protection structure and a control circuit chip electrically connected with the micro-electromechanical chip. The circuit board is provided with a second sound hole communicated with the inner part of the protection structure and a first sound hole used for receiving external sounds, and the first sound hole and the second sound hole are spaced transversely and communicated through an air gap in which a dust screen is arranged, and the dust screen at least covers the first sound hole. In the capacitance microphone with the structure, the dust screen arranged on the circuit board can prevent dust from entering, thus avoiding the failure or great sensitivity change of the capacitance microphone caused by the entry of the dust, and improving the performance of the capacitance microphone.

Description

Capacitance microphone

Technical field

The utility model relates to a kind of microphone, relates in particular to a kind of capacitance 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; be called for short MEMS); in the correlation technique; referring to Fig. 1; microelectromechanical-systems microphone 1 ' comprises wiring board 11 ' and framework 12 ' that links to each other with this wiring board 11 ' and the upper plate 13 ' that links to each other with framework 12 '; wherein; road plate 11 ', framework 12 ' and upper plate 13 ' have constituted the protection structure, and MEMS chip 17 ' and control circuit 16 ' are arranged in this protection structure.Wherein, the sound hole 14 ' that is positioned at wiring board 11 ' is relative with the back of the body chamber 171 ' of MEMS chip 17 ', the MEMS chip 17 ' of taking, carry out in the fall-down test process and SMT installation process in, enter dust easily, thereby cause 1 ' inefficacy of microelectromechanical-systems microphone or change of sensitivity big, because wiring board 11 ' finally will be attached to client with SMT technology, paste Air Filter simultaneously so can't go up at wiring board 11 '.Therefore be necessary to provide a kind of novel MEMS microphone.

The utility model content

The technical problems to be solved in the utility model is to provide a kind of well behaved capacitance microphone.

For solving the problems of the technologies described above, the technical scheme that the utility model provides is:

A kind of capacitance microphone; framework that comprise wiring board, links to each other and the upper plate that links to each other with framework with wiring board; this wiring board, framework and upper plate constitute the protection structure; be arranged on mems chip that is provided with back of the body chamber in the protection structure and the control circuit chip that is electrically connected with it; on described wiring board, be provided with and the rising tone hole of protecting inside configuration to communicate and first hole that is used to receive external voice; first hole and lateral separation, rising tone hole also are communicated with by air-gap; in this air-gap Air Filter is set, this Air Filter covers the hole at least first.

Preferably, mems chip is electrically connected by the binding gold thread with the control circuit chip.

Preferably, described rising tone hole is relative with the back of the body chamber of mems chip and be communicated with back of the body chamber.

Preferably, described wiring board is a three-decker, the ground floor wiring board links to each other with framework, second layer wiring board links to each other with the ground floor wiring board, the 3rd layer of wiring board links to each other with second layer wiring board, and rising tone hole is located at the ground floor wiring board, and first the hole is located at the 3rd layer of wiring board, second layer wiring board is provided with air-gap, and Air Filter is placed in this air-gap.

The utility model also provides a kind of capacitance microphone; comprise wiring board, the shell that links to each other with wiring board; this wiring board and shell constitute the protection structure; be arranged on mems chip that is provided with back of the body chamber in the protection structure and the control circuit chip that is electrically connected with it; on described wiring board, be provided with and the rising tone hole of protecting inside configuration to communicate and first hole that is used to receive external voice; first hole and lateral separation, rising tone hole also are communicated with by air-gap; in this air-gap Air Filter is set, this Air Filter covers the hole at least first.

The beneficial effects of the utility model are: owing to be provided with Air Filter in the circuit board, can prevent that dust from entering, the capacitance microphone of having avoided causing because of entering of dust lost efficacy or the big problem of change of sensitivity, had improved the performance of capacitance microphone.

Description of drawings

Fig. 1 is the profile of the microphone relevant with the utility model;

Fig. 2 is the profile of an embodiment of the utility model.

Embodiment

The utility model is described in further detail below in conjunction with drawings and embodiments.

The capacitance microphone that the utility model provides is mainly used on the mobile phone, accepts sound and sound is converted into the signal of telecommunication.

Referring to Fig. 2, the capacitance microphone 1 that the utility model provides, the framework 12 that comprise wiring board 11, links to each other with wiring board 11 has constituted the protection structure with the upper plate 13 that links to each other with framework 12, wiring board 11, framework 12 and upper plate 13.

Mems chip 17 and the control circuit chip 16 that is electrically connected with it are placed in the protection structure that is made of wiring board 11, framework 12 and upper plate 13.Mems chip 17 and control circuit chip 16 can all be placed on the wiring board 11, also can all be placed on the upper plate 13, certainly, also can be that mems chip 17 is placed on the wiring board 11, control circuit chip 16 is placed on the upper plate 13 or mems chip 17 is placed on the upper plate 13, and control circuit chip 16 is placed on the wiring board 11.Mems chip 17 and control circuit chip 16 can be realized by the mode of binding gold thread being electrically connected, and also can realize being electrically connected by other modes.

Be provided with first 15, the first holes 14 in hole 14 and rising tone hole and 15 lateral separations, rising tone hole and pass through air-gap 145 connections on wiring board 11, Air Filter 18 is placed in this air-gap 145.Air Filter 18 can cover first hole 14 or rising tone hole 15, also can all cover first hole 14 and rising tone hole 15.First hole 14 is used to receive outside sound, and rising tone hole 15 communicates with the protection inside configuration.

In the embodiment that the utility model provides, wiring board 11 is a three-decker, ground floor wiring board 11 links to each other with framework 12, second layer wiring board 12 links to each other with ground floor wiring board 11, the 3rd layer of wiring board 13 links to each other with second layer wiring board 12, and rising tone hole 15 is located at 11, the first holes 14 of ground floor wiring board and is located at the 3rd layer of wiring board 13, second layer wiring board is provided with air-gap 145, and Air Filter 18 is placed in this air-gap 145.Certainly, wiring board 11 is not limited to three-decker, so long as first tone-entering hole 14 is communicated with by air-gap 145 with second tone-entering hole 15, and is placed with Air Filter 18 in air-gap 145, all belongs to the scope of the utility model protection.Owing on wiring board 11, be provided with Air Filter 18, can prevent that dust from entering, the capacitance microphone of having avoided causing because of entering of dust 1 lost efficacy or the big problem of change of sensitivity, had improved the performance of capacitance microphone 1.

Rising tone hole 15 can be relative with the back of the body chamber 171 of mems chip 17, can better improve acoustical behavior.When the back of the body chamber 171 of rising tone hole 15 and mems chip 17 is relative, be communicated with back of the body chamber 171.

Certainly, framework 12 and upper plate 13 also can be integrated shells, constitute the protection structure with wiring board 11.

Above-described only is a kind of execution mode of the present utility model; should be pointed out that for the person of ordinary skill of the art at this, under the prerequisite that does not break away from the utility model creation design; can also make improvement, but these all belong to protection range of the present utility model.

Claims

1. capacitance microphone; framework that comprise wiring board, links to each other and the upper plate that links to each other with framework with wiring board; this wiring board, framework and upper plate constitute the protection structure; be arranged on mems chip that is provided with back of the body chamber in the protection structure and the control circuit chip that is electrically connected with it; it is characterized in that: on described wiring board, be provided with and the rising tone hole of protecting inside configuration to communicate and first hole that is used to receive external voice; first hole and lateral separation, rising tone hole also are communicated with by air-gap; in this air-gap Air Filter is set, this Air Filter covers the hole at least first.

2. capacitance microphone according to claim 1 is characterized in that: mems chip is electrically connected by the binding gold thread with the control circuit chip.

3. capacitance microphone according to claim 1 is characterized in that: described rising tone hole relative with the back of the body chamber of mems chip and with the back of the body chamber be communicated with.

4. capacitance microphone according to claim 1, it is characterized in that: described wiring board is a three-decker, the ground floor wiring board links to each other with framework, second layer wiring board links to each other with the ground floor wiring board, the 3rd layer of wiring board links to each other with second layer wiring board, and rising tone hole is located at the ground floor wiring board, and first the hole is located at the 3rd layer of wiring board, second layer wiring board is provided with air-gap, in this air-gap Air Filter is set.

5. capacitance microphone; comprise wiring board, the shell that links to each other with wiring board; this wiring board and shell constitute the protection structure; be arranged on mems chip that is provided with back of the body chamber in the protection structure and the control circuit chip that is electrically connected with it; it is characterized in that: on described wiring board, be provided with and the rising tone hole of protecting inside configuration to communicate and first hole that is used to receive external voice; first hole and lateral separation, rising tone hole also are communicated with by air-gap; in this air-gap Air Filter is set, this Air Filter covers the hole at least first.