CN201160322Y - dustproof microphone - Google Patents

Abstract

The utility model provides a dust-proof microphone, which comprises a shell with a sound inlet hole at the bottom and a back plate arranged in the shell and abutting against the bottom of the shell, the sound hole provided on the back plate is in contact with the The sound-incoming holes do not overlap, and the side of the back plate attached to the bottom surface of the housing is provided with sound-guiding grooves that penetrate each other but do not penetrate the back plate. The sound guide groove is used to guide the sound source entering the sound inlet hole into the sound passage hole on the back plate. Compared with the prior art, the utility model does not need to add a layer of dust-proof net, and is suitable for the technological requirements of surface mount technology (SMT), and has the advantages of good dust-proof effect, good product performance and low cost.

Description

dustproof microphone

【Technical field】

The utility model relates to a microphone, in particular to a dust-proof electret 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.

The electret microphone 10 of related structure is as shown in Figure 5, comprises shell 11, is housed in shell 11 and is separated from the back pole plate 12 of shell bottom, gasket 13, is opposite to back pole plate 12 and is separated by spacer 13 The diaphragm group 14 , the insulating ring 15 for accommodating the diaphragm group 14 , the connecting ring 16 electrically connected to the diaphragm group 14 and the circuit board 17 . The shell 11 is provided with a sound hole 110 to receive an external sound source, and the back plate 12 adjacent to the shell is provided with a sound hole 120 to receive the sound source coming in from the sound hole on the shell, so as to push the back pole The diaphragm group 14 opposite the plate 12 vibrates.

In order to prevent particles such as external dust from entering the microphone and affecting the performance of the microphone, a traditional preventive measure is to paste a layer of dust-proof net 18 on the outer surface of the shell 11 of the microphone 10 . Although this measure can prevent particles such as external dust from entering the microphone, it increases the manufacturing process of the microphone and consumes a lot of working time of employees, thereby increasing the manufacturing cost of the microphone product.

In addition, the current microphone is gradually transitioning to meet the production process requirements of surface mount technology (SMT), and the dust-proof net material pasted on the outer surface of the shell cannot withstand the high temperature of reflow soldering in the production process compatible with surface mount technology; and affect the pick-up operation in the production process compatible with surface mount technology. 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 problem of product performance degradation.

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 deficiencies of the above-mentioned prior art and provide a dust-proof microphone with good dust-proof effect, low cost and good performance.

According to the above-mentioned technical problems to be solved, a dust-proof microphone is designed, which includes a shell with a sound inlet hole at the bottom and a back plate arranged in the shell and abutting against the bottom of the shell. The sound hole does not overlap with the sound inlet hole, and the side of the back plate attached to the bottom surface of the casing is provided with sound guide grooves that communicate with each other but do not penetrate the back plate.

As a further improvement of the utility model, the interpenetrating sound guide grooves are composed of several intersecting straight line grooves.

The back plate of the utility model is bonded to the shell, and the sound holes of the two do not overlap, that is, they are not aligned, so as to prevent particles such as external dust from entering the interior of the product; The groove is used to guide the external sound source entering from the sound inlet hole on the shell into the sound passage hole of the back plate, so as to realize the vibration of the diaphragm group opposite to the back plate. Compared with the prior art, the utility model does not need to add a layer of dust-proof net, and is suitable for the technological requirements of surface mount technology (SMT), and has the advantages of good dust-proof effect, good product performance and low cost.

【Description of drawings】

Fig. 1 is a three-dimensional exploded view of the dust-proof microphone of the present invention;

Fig. 2 is a three-dimensional schematic diagram of the dust-proof microphone of the present invention;

Fig. 3 is a schematic cross-sectional view of the dust-proof microphone of the present invention;

Fig. 4 is a front view of the side of the back plate provided with sound-through grooves in the dust-proof microphone of the present invention;

Fig. 5 is a schematic cross-sectional view 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 dustproof microphone 20 of the present invention includes a housing 21 , and a circuit PCB board 27 connected to the housing 21 and forming a cavity 200 therewith. The cavity 200 is provided with an insulating ring 25, and the insulating ring 25 accommodates a back plate 22 attached to the bottom surface of the housing 21, a gasket 23, and a diaphragm group opposite to the back plate 22 and separated by the spacer 23. 24. A connection ring 26 connected with the diaphragm group 24 and the circuit PCB board 27 and electrically conducting the two.

A sound inlet hole 210 is provided on the bottom of the shell 21 to receive an external sound source.

The back plate 22 is a dielectric that can maintain the electric polarization state for a long time. This dielectric is a high molecular polymer, and free charges are distributed on the back plate 22 . The back plate 22 is provided with a sound hole 220 , and the sound hole 220 is not aligned with the sound inlet hole 210 on the shell 21 , that is, they are not overlapped, so as to prevent particles such as external dust from entering the product. As shown in Fig. 4, the surface of the back plate 22 and the bottom surface of the casing 21 is provided with a sound guide groove 221, and the sound guide groove 221 is composed of several intersecting straight line grooves, and the straight line grooves are all connected to each other. , but not through the back plate 22. Since the straight line grooves are all connected to each other, even if the sound hole and the sound inlet hole do not overlap, the sound source entering from the sound inlet hole can also enter the sound hole on the back plate through the sound guide groove 221, thereby Realize pushing the diaphragm group 24 to vibrate.

In the dust-proof microphone 20 of this structure, the back plate 22 is electrically connected to the circuit PCB board 27 through the shell 21, the diaphragm group 24 is electrically connected to the circuit PCB board 27 through the connecting ring 26, and the diaphragm group 24 and the back plate 22 are passed through The spacer 23 is separated and not conducted. Through the above-mentioned electrical connection relationship and non-conduction relationship, a capacitive effect can be realized between the back plate 22 and the diaphragm group 24 . Due to the free charge distributed on the back plate 24, there is a charge between the two poles of the capacitor. The sound wave enters from the sound inlet hole 210 of the casing 21, and then is introduced into the sound hole 210 on the back plate 22 through the sound guide groove 221, so that when the diaphragm group 24 vibrates and generates displacement, the capacitor's capacitance is changed. Capacitance, the change of capacitance makes the output terminal of the capacitor generate a corresponding alternating electric field, which forms an electrical signal corresponding to the acoustic wave signal, thus completing the function of acoustic-electric conversion.

Compared with the prior art, the utility model does not need to add a layer of dust-proof net, and is suitable for the technological requirements of surface mount technology (SMT), and has the advantages of good dust-proof effect, good product performance and low cost.

What has been described above is only a preferred embodiment of the utility model, and it should be pointed out that, for those of ordinary skill in the art, improvements can also be made without departing from the inventive concept of the utility model, but these All belong to the protection scope of the present utility model.

Claims (2)

1, a kind of dustproof microphone, comprise the back pole plate that the bottom is provided with the shell of tone-entering hole and is located in the shell and connects with outer casing bottom, sound hole that described back pole plate is provided with and described tone-entering hole are not overlapping, it is characterized in that: that the one side of fitting in described back pole plate and outer casing bottom surface is provided with mutual perforation but do not run through the groove of leading of back pole plate.

2, dustproof microphone according to claim 1 is characterized in that: the groove of leading of described mutual perforation constitutes for the some straightway grooves that intersect.

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