CN201204679Y - dustproof microphone - Google Patents

Abstract

The utility model provides a new dust-proof microphone, and a layer of dust-proof net covering the upper sound inlet hole is arranged on the inner surface of the microphone shell. Compared with the existing technology, the new dust-proof microphone has good dust-proof effect, does not increase the height of the product, and can adapt to the production process of surface mount technology (SMT).

Description

dustproof microphone

【Technical field】

The utility model relates to a microphone, in particular to a dustproof microphone.

【Background technique】

With the development of wireless communication, there are more and more mobile phone users around the world. The requirements of users for mobile phones are not only satisfied with calls, but also to be able to provide high-quality call effects. Especially the current development of mobile multimedia technology, the mobile phone Call quality is more important. The microphone of a mobile phone is used as a voice pick-up device for the mobile phone, and its design directly affects the call quality.

In order to prevent particles such as external dust from entering the microphone and affecting the performance of the microphone, the traditional preventive measure is to paste a layer of dust-proof net covering the sound inlet hole on the outer surface of the microphone shell. As shown in FIG. 1 , for the microphone 10 , a layer of dust-proof net 12 is pasted on the outer surface of the housing 11 , and the dust-proof net 12 covers the sound inlet hole on the housing to prevent particles such as external dust from entering the interior of the microphone. Although this measure can achieve the purpose of preventing particles such as external dust from entering the interior of the microphone, it increases the height of the microphone and takes up more space.

In addition, the current microphone is gradually transitioning to meet the production process requirements of surface mount technology (SMT), and the dust-proof net pasted on the outer surface of the shell will affect the suction operation in the production process of surface mount technology compatible. Therefore, at present, none of the SMD microphones compatible with surface mount devices can paste a layer of dust-proof net on the outer surface of the housing. However, without this dust-proof net, particles such as external dust will enter the product during the reflow process and use of the product, resulting in a decrease in product performance.

Therefore, it is necessary to study a new type of microphone that can achieve a good dust-proof effect.

【Content of utility model】

The technical problem to be solved by the utility model is to overcome the above-mentioned deficiencies and provide a new dust-proof microphone with good dust-proof effect and suitable for SMT production process.

According to the above-mentioned technical problems to be solved, a dust-proof microphone is designed, which includes a diaphragm group and a casing for containing the diaphragm group. The bottom of the casing is provided with a sound inlet hole, including an inner surface and an outer surface. The set includes a boron film ring and a diaphragm, the boron film ring is in contact with the inner surface of the shell, and a dust-proof net covering the sound inlet hole is also arranged on the inner surface of the shell

As an improvement of the above invention, the diameter of the dust-proof net is less than the inner diameter of the boron film ring; the thickness of the dust-proof net is less than the thickness of the boron film ring.

Compared with the prior art, the utility model is provided with a layer of dust-proof net on the inner surface of the shell, which has the advantages of good dust-proof effect and no increase in the height of the microphone, and can adapt to the production process of surface mount technology (SMT).

【Description of drawings】

Fig. 1 is the three-dimensional exploded view of the electret microphone of the embodiment of the present invention;

Fig. 2 is a three-dimensional schematic diagram of an assembled electret microphone according to an embodiment of the present invention;

Fig. 3 is the sectional view of A-A direction in Fig. 2;

FIG. 4 is a schematic diagram of a full cross-section of an electret microphone with a related structure.

【Detailed ways】

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

As shown in Fig. 1, Fig. 2 and Fig. 3, the dust-proof microphone 20 of the embodiment of the present utility model includes a casing 21 and a diaphragm group 22 and a gasket 23 contained in the casing 21, which are opposite to the diaphragm group 22 and are cushioned. The back electrode plate 24 separated by the sheet 23 , the back electrode seat 25 for accommodating the back electrode plate 24 and the connection ring 26 , and the circuit board 27 connected with the connection ring 26 .

The bottom of the casing 21 is provided with a sound inlet hole 210 for receiving an external sound source, including an inner surface 211 and an outer surface 212 .

The diaphragm group 22 includes a diaphragm 220 and a diaphragm ring 221 stretching the diaphragm. The boron film ring 221 abuts against the inner surface 211 of the bottom of the shell 21 , and the boron film ring 221 has a certain thickness, so a cavity 213 is formed between the diaphragm group 22 and the bottom of the shell 21 .

In order to prevent particles such as external dust from entering the product and affecting the performance of the product, a dust-proof net 28 covering the sound inlet 210 is pasted on the inner surface 211 of the casing 21 . The dustproof net 28 can be made of materials such as non-woven fabric or net fabric, and can be adhered to the shell by double-sided adhesive. Its diameter is less than the inner diameter of the bandage ring 221, and its thickness is also less than the thickness of the bandage ring 221. Therefore, the dust-proof net 28 is located in the cavity 213 formed by the diaphragm group 22 and the shell 21, thereby realizing the product itself. The height basically does not increase its height, and does not affect the vibration response of the diaphragm 220 . In addition, since the dust-proof net 28 is arranged in the housing 21, it will not affect the adsorption operation existing in the production process of the surface mount technology (SMT), so the utility model is compatible with the surface mount technology (SMT).

Capacitance effect is realized between the back plate 24 and the diaphragm group 22 in the embodiment of the present invention. Since there are free charges distributed on the back plate 24, there is a charge between the two poles of the capacitor. When the sound wave causes the diaphragm group 22 to vibrate and generate displacement, the capacitance of the capacitor is changed, and the change of the capacitance makes the capacitance of the capacitor The corresponding alternating electric field is generated at the output end, and the electric signal corresponding to the sound wave signal is formed, thus completing the function of sound-electric conversion.

The above is only one embodiment of the utility model, and the embodiment of the utility model may also be other types of microphones, such as dynamic microphones, silicon-based microphones, and the like. It should be pointed out here that those skilled in the art can make improvements without departing from the inventive concept of the present utility model, but these all belong to the protection scope of the present utility model.

Claims (3)

1, a kind of dustproof microphone, comprise the vibrating diaphragm group and accommodate the shell of vibrating diaphragm group, the bottom of described shell is provided with tone-entering hole, comprises inner surface and outer surface, described vibrating diaphragm group comprises boron film ring and vibrating diaphragm, boron film ring and inner surface of outer cover connect, and it is characterized in that: also be provided with the Air Filter that one deck covers described tone-entering hole on the inner surface of shell.

2. dustproof microphone according to claim 1 is characterized in that: the diameter of described Air Filter is less than the internal diameter of boron film ring.

3, dustproof microphone according to claim 2, it is characterized in that: the thickness of described Air Filter is less than the thickness of boron film ring.

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