CN201054789Y - Electrete microphone - Google Patents

Abstract

The utility model relates to an electret microphone, which comprises an upper cover, an electret, a membrane group, a spacer positioned between the electret and the membrane group and a lower cover. The lower cover is provided with a circuit bottom board and a side wall extending upward from the circuit bottom board, and the circuit bottom board and the side wall are surrounded into a cavity for containing the elements. The spacer is separated the electret from the membrane to form an air chamber; the membrane group is communicated to a circuit board in virtue of an electronic element arranged on the circuit bottom board, and the electret is communicated to the circuit bottom board through a conductive path arranged on the lower cover; but the electret is insulated from the membrane group. Consequently, the capacitance effect can be achieved between the electret and the membrane group via the communication. The electret and the membrane group of the utility model use the electronic elements or a conductive path on the lower cover together to form a circuit with capacitance effect, thereby simplifying the structure of the microphone, saving the cost, being convenient to be assembled, and further realizing the micromation.

Description

electret microphone

【Technical field】

The utility model relates to a microphone, in particular to an 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. In addition, mobile phones are becoming more and more miniaturized, and how to maintain good performance of the components on the mobile phone, such as a microphone, in a continuously decreasing volume is indeed an important issue.

Currently commonly used microphones mainly include condenser microphones and MEMS (micro-electromechanical system) microphones, and condenser microphones are widely used due to their low cost. The most mainstream of condenser microphones is the electret microphone.

Fig. 1 has shown the structure of a kind of existing electret microphone related to the utility model. The existing electret microphone 10 mainly includes a cover body 11, a diaphragm group 12 housed in the cover body 11, a gasket 13, an electret 14 opposite to the diaphragm group 12 and separated by the gasket 13, An insulating ring 15 accommodating the electret 14 , a connecting ring 16 electrically connecting the electret 14 and a circuit board 17 are used. The cover 11 is provided with a sound hole 110 for receiving an external sound source, and the diaphragm set 12 includes a diaphragm 121 and a diaphragm ring 122 supporting the diaphragm 121 . The diaphragm ring 122 is electrically connected to the circuit board through the cover body 11 . The electret 14 is insulated from the diaphragm group 12 by the insulating ring 15 and connected to the circuit board 17 through the connection ring 16 . Therefore, by virtue of the above-mentioned electrical connection relationship, a capacitive effect can be realized between the electret 14 and the diaphragm set 12 . When an external sound source enters the cover 11, the diaphragm group 12 is vibrated to cause the distance between it and the electret 14 to change, which in turn causes the capacitance between the two to change, causing the current to change, thereby transmitting the sound wave converted into an electrical signal.

However, under the condition that the size of the mobile phone is continuously reduced, the structure of the existing microphone is relatively complicated, which is not conducive to the reduction of the volume of the microphone.

Therefore, it is necessary to provide a new electret microphone to overcome the above disadvantages.

【Content of utility model】

The purpose of the utility model is to provide a new electret microphone, which can reduce the volume of the microphone, simplify the assembly procedure and improve the assembly efficiency.

The purpose of this utility model is achieved in that an electret microphone mainly includes an electret, a diaphragm group, a gasket between the electret and the diaphragm group and a lower cover, and the lower cover is provided with a circuit base plate As well as the side wall extending upward from the circuit bottom plate, the electret and the diaphragm group are respectively electrically connected to the side wall and the conductive path on the circuit bottom plate to form a circuit with capacitive effect.

As an improvement of the electret microphone of the utility model, the electret microphone also includes an upper cover, and the electret, the diaphragm group and the gasket are accommodated in the accommodation space formed by the upper cover and the lower cover.

As another improvement of the electret microphone of the present invention, the packaging shape of the electret microphone is a cylinder.

As another improvement of the electret microphone of the present invention, the packaging shape of the electret microphone is a cuboid.

As another improvement of the electret microphone of the present invention, a protrusion is provided on the side wall of the lower cover to identify the installation position of the microphone.

Compared with the prior art, the utility model has the following advantages: the connecting ring and insulating ring in the prior art are omitted, the structure of the microphone is simplified, the assembly procedure is simplified, and the packaging volume of the microphone can be reduced to realize further miniaturization.

【Description of drawings】

Fig. 1 is the three-dimensional exploded schematic diagram of a kind of existing electret microphone;

Fig. 2 is the three-dimensional exploded schematic diagram of the utility model electret microphone;

Fig. 3 is the three-dimensional combination schematic diagram of the utility model electret microphone;

Fig. 4 is the reverse view of Fig. 3;

Fig. 5 is the three-dimensional assembly diagram of another embodiment of the electret microphone of the present invention;

FIG. 6 is a reverse view of FIG. 5 .

【Detailed ways】

The specific structure of the utility model electret microphone will be described in detail below in conjunction with the accompanying drawings.

Please refer to Figure 2 to Figure 4:

The utility model electret microphone 20 mainly includes an upper cover 21 , an electret 22 , a gasket 23 , a diaphragm group 24 opposite to the electret 22 and separated by the gasket 23 , and a lower cover 25 . The diaphragm set 24 includes a diaphragm 241 and a diaphragm ring 242 supporting the diaphragm 241 .

The lower cover 25 is provided with a circuit bottom plate 251 on which electronic components 254 and other conductive paths are arranged. The side wall 252 extends upward from the circuit bottom plate 251. The side wall 252 is also provided with a conductive path. The circuit bottom plate 251 and the side wall 252 A cavity 253 is formed around it, and a protrusion 255 extends outward from the side wall 252 .

The diaphragm group 24 is electrically connected to the circuit base 251 through the electronic component 254 or the conductive path on the circuit base 251, and the electret 22 is also electrically connected to the circuit base 251 through the conductive path on the side wall 252 of the lower cover 25, but The two conductive paths are not short circuited. The diaphragm group 24 and the electret 22 are separated and non-conductive by the gasket 23. Through the above-mentioned electrical connection relationship and non-conduction relationship, there is a basic capacitance effect between the diaphragm group 24 and the electret 22. architecture.

The electret 22 is a dielectric that can maintain an electric polarization state for a long time. This dielectric is a high molecular polymer, and free charges are distributed on the electret 22 . Since there are free charges distributed on the electret 22, there is a charge between the two poles of the capacitor. When the sound wave causes the diaphragm 241 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.

In this embodiment, the electret 22 and the diaphragm group 24 jointly use the conductive path on the lower cover 25 as the two poles of the capacitor, which saves the connecting ring and insulating ring in the prior art, simplifies the structure, and can reduce the size of the microphone. volume of.

The package shape of the electret microphone 20 in this embodiment is a cylinder, and a number of conductive sheets 256 are provided on the bottom side of the circuit base plate 251 (see FIG. 4 for details) to electrically connect to the external circuit. The setting of the above-mentioned bumps 255 is In order to identify the installation direction when the microphone 20 is soldered to the external circuit, it is possible to prevent misalignment of the conductive sheet 256 and the corresponding contact of the external circuit.

Fig. 5 and Fig. 6 are another embodiment of the electret microphone of the present invention. In this embodiment, the packaging shape of the electret microphone 30 is a cuboid, and the component composition and positional relationship or matching relationship are the same as those of the previous embodiment. The connecting ring and insulating ring in the prior art are also eliminated.

As a cuboid, it already has the identification of the installation direction, but it can also be provided with bumps to enhance the identification effect (not shown in the figure, but its specific structure and effect can be understood through the description of the previous embodiment).

The above is only a preferred embodiment of the utility model, and the scope of protection of the utility model is not limited to the above-mentioned implementation, but all equivalent modifications or changes made by those of ordinary skill in the art based on the content disclosed in the utility model should be included within the scope of protection described in the claims.

Claims (5)

1. electret microphone, it is characterized in that: this electret microphone mainly comprises electret, diaphragm group, pad and lower cover between electret and diaphragm group, under be covered with circuit substrate and by the upwardly extending sidewall of circuit substrate, electret and diaphragm group electrically connect conductive path on sidewall and the circuit substrate respectively to form the circuit of tool capacity effect.

2. electret microphone as claimed in claim 1 is characterized in that: this electret microphone also comprises loam cake, and electret, diaphragm group and pad are contained in the receiving space of loam cake and lower cover formation.

3. electret microphone as claimed in claim 1 is characterized in that: the encapsulation of this electret microphone is shaped as cylinder.

4. electret microphone as claimed in claim 1 is characterized in that: the encapsulation of this electret microphone is shaped as cuboid.

5. as each described electret microphone in the claim 1 to 4, it is characterized in that: stretching out on the sidewall of lower cover is provided with projection in order to distinguish the position of microphone.

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