CN201563214U

CN201563214U - microphone

Info

Publication number: CN201563214U
Application number: CN200920206050XU
Authority: CN
Inventors: 吴志江; 苏永泽
Original assignee: AAC Acoustic Technologies Shenzhen Co Ltd; Shenzhen Meiou Electronics Co Ltd
Current assignee: AAC Technologies Holdings Shenzhen Co Ltd; Shenzhen Meiou Electronics Co Ltd
Priority date: 2009-10-19
Filing date: 2009-10-19
Publication date: 2010-08-25
Anticipated expiration: 2019-10-19

Abstract

The utility model discloses a microphone which comprises a first circuit board, a cavity body connected with the first circuit board and a second circuit board connected with the cavity body, wherein the first circuit board, the cavity body and the second circuit board form into a protective structure, an MEMES chip with a back cavity and a control circuit chip are respectively arranged in the protective structure, the protective structure is provided with a sound access, a dust screen is arranged on the circumference of the sound access, a shielding cover is arranged outside the protective structure, a third sound hole is formed on the shielding cover, the dust screen is arranged between the sound access and the third sound hole, and the back cavity of the MEMES chip is covered on the sound access. The microphone has high signal-to-noise ratio.

Description

Microphone

[technical field]

The utility model relates to a kind of microphone, relates in particular to a kind of microphone that is applied to miniature electrical equipment.

[background technology]

Mobile communication technology is rapidly developed in recent years.The consumer uses mobile communication equipment more and more, and for example portable phone, the portable phone that can surf the Net, personal digital assistant, laptop computer, laptop computer, figure input card maybe can be by other equipment public or that dedicated communications network communicates.The technological progress of the expansion at honeycomb networking and mobile communication aspect makes more consumers use mobile communication equipment.

The consumer not only is satisfied with and can converses the requirement of mobile communication equipment, and want high-quality communication effect can be provided, especially the development of mobile multimedia technology, the speech quality of mobile phone becomes more important, the microphone of mobile phone is as the voice device of mobile phone, and its design quality directly influences speech quality.

And the microphone of using more and better performances at present is MEMS (Micro-Electro-Mechanical-System Microphone) microphone structure.As shown in Figure 1, the microphone of correlation technique, comprise circuit board 11 ', sidewall 12 ' and be provided with the loam cake 13 ' of sound hole 21 ', place control circuit 2 ' and transducer 3 ' on the circuit board 11 ' respectively, control circuit 2 ' and transducer 3 ' are electrically connected by lead, the microphone of this structure, because acoustic pressure on transducer, makes that the operatic tunes at the back side is big inadequately from positive effect, signal to noise ratio is low.

[utility model content]

The purpose of this utility model is to provide a kind of microphone that improves signal to noise ratio.

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

A kind of microphone; cavity that comprise first wiring board, links to each other and second wiring board that links to each other with cavity with first wiring board; described first wiring board, cavity and second wiring board constitute the protection structure; the MEMES chip and the control circuit chip that are provided with back of the body chamber are arranged in this protection structure; the protection structure is provided with tone-entering hole; the tone-entering hole periphery is provided with Air Filter; the protection structural outer is provided with radome; radome is provided with the hole the 3rd; Air Filter is arranged between tone-entering hole and the 3rd hole, and the back of the body chamber of MEMS chip covers tone-entering hole.

Preferably, MEMS chip and control circuit chip are separately positioned on first wiring board.

The beneficial effects of the utility model are, owing to the back side of sound from the MEMS chip affacts on the MEMS chip, have improved the signal to noise ratio of microphone; Owing to be provided with Air Filter at the tone-entering hole place, prevent that the dust in the external world from falling on the MEMS chip, gas shock to external world also can be played the effect of buffering, has improved reliability of products.

[description of drawings]

Fig. 1 is the microphone side profile of correlation technique;

Fig. 2 is the microphone side profile that the utility model provides.

[embodiment]

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

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

Microphone as shown in Figure 2, the cavity 13 that comprise first wiring board 11, links to each other with first wiring board 11 constitutes the protection structure with second wiring board, 12, the first wiring boards 11 that link to each other with cavity 13, cavity 13 and second wiring board 12.MEMES chip 16 and control circuit chip 17 are arranged in this protection structure, and MEMS chip 16 is provided with back of the body chamber 161.

The protection structure is provided with tone-entering hole 15; tone-entering hole 15 peripheries are provided with Air Filter 18, and the protection structural outer is provided with radome 14, and radome 14 is provided with hole 141 the 3rd; Air Filter 18 is arranged between tone-entering hole 15 and the 3rd hole 141, and the back of the body chamber 161 of MEMS chip 16 covers tone-entering holes 161.

In the embodiment that the utility model provides, MEMS chip 16 and control circuit chip 17 are separately positioned on second wiring board 12.Certainly, also can be provided with on first wiring board 11.

Being connected by the metal conduction hole that is arranged in the cavity 13 of the electric signal of first wiring board 11 and second wiring board 12 realizes.

Because sound affacts on the MEMS chip 16 from the back side of MEMS chip 16, has improved the signal to noise ratio of microphone; Owing to be provided with Air Filter 18 at tone-entering hole 15 places, prevent that the dust in the external world from falling on the MEMS chip 16, gas shock to external world also can be played the effect of buffering, has improved reliability of products.

Above-described only is better embodiment 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. microphone; cavity that comprise first wiring board, links to each other and second wiring board that links to each other with cavity with first wiring board; described first wiring board, cavity and second wiring board constitute the protection structure; the MEMES chip and the control circuit chip that are provided with back of the body chamber are arranged in this protection structure; it is characterized in that: the protection structure is provided with tone-entering hole; the tone-entering hole periphery is provided with Air Filter; the protection structural outer is provided with radome; radome is provided with the hole the 3rd; Air Filter is arranged between tone-entering hole and the 3rd hole, and the back of the body chamber of MEMS chip covers tone-entering hole.

2. microphone according to claim 1 is characterized in that: MEMS chip and control circuit chip are separately positioned on first wiring board.