CN202957950U

CN202957950U - Air pressure blowing prevention acoustoelectric sensor

Info

Publication number: CN202957950U
Application number: CN 201220630640
Authority: CN
Inventors: 李明
Original assignee: Shandong Gettop Acoustic Co Ltd
Current assignee: Gettop Acoustic Co Ltd
Priority date: 2012-11-26
Filing date: 2012-11-26
Publication date: 2013-05-29
Anticipated expiration: 2022-11-26

Abstract

The utility model provides an air pressure blowing prevention acoustoelectric sensor which comprises a casing provided with a sound hole, wherein at least one protective screening layer is arranged on the casing at the sound hole position. Protective devices are not arranged at the sound hole position of a normal micro-electromechanical system (MEMS) sensor, while protective screenings are arranged in the air pressure blowing prevention acoustoelectric sensor, so that the impact of air pressure on diaphragms is reduced by aid of the protective screenings in the air pressure blowing process of the assembling procedure, influence of air pressure impact on the vibrating diaphragms can be effectively reduced or resisted, and the sensor is protected from damage in the assembling process.

Description

Anti-air pressure blows and hits acoustoelectric sensor

Technical field

The utility model relates to a kind of microphone, particularly relates to a kind of anti-air pressure and blows and hit acoustoelectric sensor.

Background technology

MEMS (micro electro mechanical system) (Microelectro Mechanical Systems, MEMS) microphone (MEMS MIC), a kind of acoustoelectric sensor (being converted to the device of the signal of telecommunication for voice signal), for realizing that voice signal is converted to the signal of telecommunication, transducer has a diaphragm that can shake, and the entrance (sound hole) of a sound must be arranged simultaneously, and sound enters transducer by sound hole, cause the sensor diaphragm vibrations, produce the signal of telecommunication.The diaphragm of MEMS MIC is thinner, and thickness is about 2um, blows while hitting and very easily is damaged being subject to air pressure.

The MEMS transducer is in being assembled to mobile phone or other electric equipment products processes, usually with the element after the compressed air purging welding, to remove the residue after welding, blow air pressure while hitting at air pressure and enter transducer by sound hole, the impact endurance test shock diaphragm, the diaphragm breakage that easily causes vibrations, thus product failure produced.

Summary of the invention

Technical problem to be solved in the utility model is to provide a kind of anti-air pressure and blows and hit acoustoelectric sensor, in the air pressure of assembling procedure blows the process of hitting, can effectively reduce or stop air pressure to impact the impact on the vibrations diaphragm.

Technical scheme is as follows:

A kind of anti-air pressure blows and hits acoustoelectric sensor, comprises the shell that is provided with sound hole, is provided with at least one deck protection network in the position of sound hole at described shell.

Further: described protection network sticks on internal face or the outside wall surface of described shell.

Further: described shell is provided with depressed part, and described sound hole is opened at described depressed part.

Further: described protection network is selected Air Filter or the waterproof net of acoustics special use.

Compared with prior art, the utlity model has following advantage:

Common MEMS transducer sound hole does not have protector; in the utility model; owing to being provided with protection network; in the air pressure of assembling procedure blows the process of hitting; protection network has reduced air pressure to the diaphragm impulsive force; can effectively reduce or stop air pressure to impact the impact on the vibrations diaphragm, the protection transducer sustain damage in assembling process.

The accompanying drawing explanation

Fig. 1 is that in the utility model, anti-air pressure blows the structure chart that hits acoustoelectric sensor;

Fig. 2 a is the enlarged drawing of nonwoven fabrics one in the utility model;

Fig. 2 b is the enlarged drawing of nonwoven fabrics two in the utility model;

Fig. 3 is the enlarged drawing of Gore protection network in the utility model.

Embodiment

For above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.

As shown in Figure 1, be that in the utility model, anti-air pressure blows the structure chart that hits acoustoelectric sensor.Anti-air pressure blows the structure of hitting acoustoelectric sensor and comprises: protection network 11, depressed part 12, sound hole 13, shell 14 and terminal block 15, the parts such as ASIS chip, MEMS chip and vibrations diaphragm are arranged on terminal block 15, and being positioned at shell 14 inside, shell 14 is fixed on terminal block 15.Position at the sound hole 13 of shell 14 caves inward, and forms depressed part 12, and sound hole 13 is positioned at depressed part 12, and protection network 11 sticks on the position of sound hole 13.

Protection network 11 can stick on the internal face of shell 14, also can stick on the outside wall surface of shell 14, or directly sticks on the vibrations diaphragm.

In the utility model, voice signal can enter sound hole 13 by protection network 11, and conducts into shell 14 inside, but common Pneumatic pipe cleaner is decayed while crossing protection network 11.

Sound wave when propagating, if by a size close to or be less than the object blocks of wavelength, just walk around this object, proceed.The frequency range that people's ear can receive is 20-20000Hz, so the wave-length coverage that people's ear can receive is 0.017-17m.But the mesh diameter of general acoustics silk screen is about 50um, is less than wavelength, therefore can walking around protection network, sound enters MIC inside.

In the utility model, compressed air is entering MIC and can be subject to stop (the similar anti-wind net of principle) of protection network 11, and pressure-air runs into stopping of protection network 11, and Speed Reduction or be blocked in outside has reduced the impulsive force of air to diaphragm.

The bonding protection network 11 of MEMS blows and hits experimental verification

One, experiment purpose

Can the protection network 11 of the checking bonding anti-backflow in MIC sound hole place alleviate the damaged condition of high pressure air pressure gun to MIC.

Two, concrete experimental procedure

1, the impact of the bonding different number of plies protection networks 11 of checking MIC on MIC self sensitivity and frequency response;

2,, after verifying bonding protection network 11, simulation client condition, blow and hit MIC with the high pressure air pressure gun, the damaged condition of MIC.

Three, experimental result

1, after bonding protection network 11, tri-layers of MIC self change of sensitivity value<0.6dB(), frequency response is substantially unchanged.

2, be bonded with protection network 11

Aspect the wind resistance rifle blows and hits, after bonding protection network 11, air pressure gun apart from MIC 3-4cm outside, can alleviate the damage of air pressure gun to MIC.

Four, concrete experimental data

1, bonding different number of plies protection network 11, as follows on the experimental data of MIC self sensitivity and frequency response impact:

No.	Sticky net 1KHZ Sens not	1 layer of protection network, 1KHZ Sens	Difference
				1	-45.8	-46.0	-0.2
2	-46.4	-46.5	-0.1
				3	-46.9	-46.9	0.0
4	-46.8	-46.9	-0.1
				5	-46.4	-46.4	0.0
No.	Sticky net 1KHZ Sens not	2 layers of protection network, 1KHZ Sens
				6	-46.3	-46.4	-0.1
7	-45.8	-46.1	-0.3
				8	-46.5	-47.1	-0.6
9	-47.0	-46.9	0.1
				10	-46.8	-46.9	-0.1
No.	Sticky net 1KHZ Sens not	3 layers of protection network, 1KHZ Sens
				11	-47.1	-46.9	0.2
12	-46.5	-46.7	-0.2
				13	-46.3	-46.3	0.0
14	-46.5	-46.2	0.3
				15	-47.0	-47.5	-0.5

2, after bonding protection network 11, air pressure gun blows the verification msg of hitting, 10 times (pcs) of every kind of checking.

The result is as follows:

Figure DEST_PATH_RE-RE-DEST_PATH_IMAGE002

As shown in Figure 2 a, be the enlarged drawing of nonwoven fabrics one in the utility model, Fig. 2 b is the enlarged drawing of nonwoven fabrics two in the utility model, Fig. 3 is the enlarged drawing of the novel middle Gore protection network of this use.

In the utility model, the application example of nonwoven fabrics has been enumerated two kinds---nonwoven fabrics one and nonwoven fabrics two.

In the utility model, protection network 11 is selected Air Filter or the waterproof net of acoustics special use, as nonwoven fabrics, Ge Er (Gore) protection network etc., guarantees entering of sound wave.

Configuration aspects, protection network 11 is formed by orientation or random fiber interweaving, needs two-layer or more multi-layered number.

Claims

1. an anti-air pressure blows and hits acoustoelectric sensor, comprises the shell that is provided with sound hole, it is characterized in that: be provided with at least one deck protection network in the position of sound hole at described shell.

2. anti-air pressure as claimed in claim 1 blows and hits acoustoelectric sensor, it is characterized in that: described protection network sticks on internal face or the outside wall surface of described shell.

3. hit acoustoelectric sensor as claim 1 or 2 described anti-air pressure blow, it is characterized in that: described shell is provided with depressed part, and described sound hole is opened at described depressed part.

4. anti-air pressure as claimed in claim 3 blows and hits acoustoelectric sensor, it is characterized in that: described protection network is selected Air Filter or the waterproof net of acoustics special use.