CN112929774A

CN112929774A - Capacitor microphone core with shunt channel

Info

Publication number: CN112929774A
Application number: CN202110325700.8A
Authority: CN
Inventors: 李国兵
Original assignee: Foshan Haixinle Electroacoustic Technology Co ltd
Current assignee: Foshan Haixinle Electroacoustic Technology Co ltd
Priority date: 2021-03-26
Filing date: 2021-03-26
Publication date: 2021-06-08

Abstract

The invention discloses a capacitor microphone core with a shunt channel, wherein the front cavity is connected with a vent hole through the shunt channel consisting of a front sound hole, a front cavity, an air guide structural member, a side cavity and a vent hole which are sequentially connected, redundant sound waves of the front cavity are shunted through the sound shunt channel, so that the volume flow rate of sound airflow flowing through a vibrating diaphragm is reduced, the sound airflow passing through the vibrating diaphragm is kept in a relatively constant range with small fluctuation, and further the vibration between the vibrating diaphragm and a back polar plate is relatively constant, so that the generated electric signals are relatively stable, the tone quality effect is improved, meanwhile, noise is avoided, and the sound pickup distance, the sound sensitivity and the definition of sound are improved.

Description

Capacitor microphone core with shunt channel

Technical Field

The invention relates to the technical field of microphone accessories, in particular to a capacitor microphone core with a shunt channel.

Background

The microphone core is an energy conversion device for converting a sound signal into an electric signal, is an input terminal of sound equipment, is an important component of a microphone, is generally cylindrical in appearance, is closed in a shell, and is internally provided with a vibrating diaphragm, a gasket, a back plate, an acoustic cavity, an electronic element, a tuning material, a welding piece and the like; because current general electric capacity miaow core structure is comparatively simple, only a sound passageway can cause the vibrating diaphragm vibration too big, the tone quality effect is not good, the difficult regulation of sensitivity still produces some noise easily, has influenced the input quality of sound.

Therefore, the existing microphone has the defects, and needs to be improved and further developed.

Disclosure of Invention

In order to make up for the defects in the prior art, the invention provides the capacitor microphone core with the shunt channel, which is applied to a microphone and can improve the pickup distance, the sensitivity and the tone quality effect and avoid noise.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the method comprises the following steps: the device comprises a shell, and a vibrating diaphragm, a gasket, an acoustic assembly and a bottom plate which are sequentially arranged in the shell; be the ante-chamber between shell and the vibrating diaphragm, be equipped with the side chamber between the outside of vibrating diaphragm, gasket, acoustics subassembly and bottom plate and the shell, be equipped with the air guide structure of connecting ante-chamber and side chamber between the medial surface of shell and the vibrating diaphragm, the side of shell is equipped with the air vent, the terminal surface of shell is equipped with the phonate hole of advancing, wherein the phonate hole of advancing, ante-chamber, air guide structure, side chamber and air vent connect gradually.

Further, the acoustic assembly includes: the plastic cavity, and the back plate, the middle cavity ring, the damping plate and the back cavity ring which are arranged in the plastic cavity in sequence.

Furthermore, dustproof cloth is arranged on the outer side end face of the shell.

Furthermore, the air guide structural part is a metal mesh gasket.

Furthermore, the air guide structural part is a plastic gasket with a vent groove.

Furthermore, the air guide structure is a groove on the end surface of the inner side of the shell.

Further, the vent holes are evenly distributed on the side face of the shell.

Furthermore, the bottom plate is a PCB plate, and a vent hole is formed in the bottom plate.

The capacitor microphone core with the shunt channel has the advantages that the front cavity is connected with the vent hole through the shunt channel consisting of the advancing sound hole, the front cavity, the air guide structural member, the side cavity and the vent hole which are sequentially connected, and the capacitor microphone core with the shunt channel has the advantages that: if the input sound airflow is too large, the sound airflow is divided from the front cavity to the vent hole through the sound dividing channel, so that the volume flow rate of the sound airflow flowing through the vibrating diaphragm is reduced, the sound airflow passing through the vibrating diaphragm is kept in a relatively constant range with small fluctuation, and the vibration between the vibrating diaphragm and the back plate is relatively constant, the generated electric signal is relatively stable, the tone quality effect is improved, meanwhile, the noise is avoided, if the sound airflow is too small, the sound airflow passing through the diaphragm is insufficient, the shunt passage can flow the sound airflow outside the microphone core to the front cavity through the vent hole, superpose with original sound air current that is used in on the vibrating diaphragm, make the sound air current of flowing through on the vibrating diaphragm obtain the reinforcing, make the sound air current of flowing through on the vibrating diaphragm keep a relatively stable interval, improve the pickup distance, the sound sensitivity and the definition of sound.

In addition, when the front advancing sound hole of the capacitor microphone core is close to the sound source, the air guide hole plays a similar shunting and air leakage effect, so that the bass sound is not heavy and stuffy when the microphone core is close to the field effect, and the microphone can sound bright.

Drawings

FIG. 1 is an exploded view of a capacitive microphone with a shunt channel according to the present invention;

FIG. 2 is a cross-sectional view of a capacitive microphone core with a shunt channel according to the present invention;

FIG. 3 is a perspective cross-sectional view of a capacitive microphone core with a shunt channel according to the present invention;

fig. 4 is a perspective cross-sectional view of a capacitive microphone housing with a shunt channel according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The structure of the capacitor microphone core with the shunt channel provided by the invention is shown in fig. 1-4, and the capacitor microphone core with the shunt channel comprises: the acoustic module comprises a shell 10, and a diaphragm 20, a gasket 30, an acoustic assembly 40 and a bottom plate 50 which are arranged in the shell 10 in sequence; a front cavity 1 is arranged between the shell 10 and the diaphragm 20, a side cavity 2 is arranged between the outer sides of the diaphragm 20, the gasket 30, the acoustic assembly 40 and the bottom plate 50 and the shell 10, an air guide structural member 60 for connecting the front cavity 1 and the side cavity 2 is arranged between the inner side end surface of the shell 10 and the diaphragm 20, a vent hole 11 is arranged on the side surface of the shell 10, and an advance sound hole 12 is arranged on the end surface of the shell 10, wherein the advance sound hole 12, the front cavity 1, the air guide structural member 60, the side cavity 2 and the vent hole 11 are sequentially connected to form a sound diversion channel, and the redundant sound airflow is diverted through the sound diversion channel, so that the sound airflow acting on the diaphragm 20 is kept in a range with small fluctuation and relatively constant fluctuation, further the generated electric signal is relatively stable, the effect of recording sound of the microphone is improved, and meanwhile, noise is avoided.

The vent 11 may also be provided on the base plate 50 depending on design requirements in a particular application.

Specifically, the acoustic assembly 40 includes: the plastic cavity 41 and the back plate 42, the middle ring 43, the damping plate 44 and the back ring 45 sequentially arranged in the plastic cavity 41, wherein the outer diameter of the plastic cavity 41 is the same as the outer diameter of the vibrating diaphragm 20, the back plate 42 is next to the gasket 30, the back ring 45 is next to the bottom plate 50, wherein the bottom plate 50 is provided with a back sound hole, the working principle is that the sound waves emitted by the sound source respectively reach the front and back front sound holes, and due to the attenuation in the sound wave phase difference and the sound energy transmission, the sound pressure difference exists between the front and back front sound holes, so that the sound pressures at two sides of the vibrating diaphragm 20 are unbalanced, the vibrating diaphragm 20 vibrates, the capacitance between the vibrating diaphragm 20 and the back plate 42 is changed, the current in the load resistor is correspondingly changed, and therefore, the alternating voltage output corresponding to the sound wave frequency is generated at two ends of the resistor, in this application, the sound waves are shunted by adopting the shunting channel, so that the sound pressure, the burr of sound is prevented from appearing, makes the sound more mellow.

Specifically, in order to prevent dust from entering the interior of the microphone and affecting the sensitivity of the diaphragm 20, a dustproof cloth 70 is disposed on the outer side end face of the housing 10, so as to improve the cleanliness of the microphone.

Specifically, in the preferred embodiment, as shown in fig. 4, the air guide structure 60 is a groove on the inner end surface of the casing, that is, a plurality of air-permeable grooves are formed on the inner end surface of the metal casing, and the front cavity and the side cavity are communicated through the grooves, so as to ensure the smoothness of the flow-dividing channel.

Specifically, in other embodiments, as shown in fig. 2, the air guide structure 60 may be a metal mesh pad woven by metal wires, and the front cavity and the side cavity are communicated through the air permeability of the metal mesh pad, so as to ensure the smoothness of the flow dividing channel.

In another embodiment, the air guiding structure 60 may also be a plastic gasket with a vent groove, and the vent groove of the plastic gasket connects the front cavity and the side cavity to ensure the smooth flow of the flow dividing channel.

Specifically, in order to prevent the vent holes 11 from being blocked to affect the flow dividing effect of the flow dividing channel, the vent holes 11 are provided in a plurality, and the vent holes 11 are circular and evenly distributed on the side surface of the housing 10. When the acoustic compliance of the front chamber cancels the acoustic mass compliance of one of the front chambers, the other acts as a compensation and balance, i.e., to maintain the volumetric flow rate through the diaphragm within a relatively constant range with relatively little fluctuation.

Other embodiments may provide side cavity 2 as a cavity in addition to the housing. The vent holes may be provided in the wall of the additional chamber.

Specifically, the bottom plate 50 is a PCB, and components arranged inside the housing 10 are compacted and fixed by press-fitting and riveting at the opening of the housing 10, and the riveting opening is formed at the outer edge of the bottom plate 50.

The existing microphone is not provided with a shunt channel, when a simple front cavity structure is adopted, when larger sound waves are input, the fluctuation of the volume flow rate of a vibrating diaphragm is larger, distortion, sound breaking, squeaking and noise are easy to occur, and the microphone is required to be far away from a sound source; when the volume flow rate is small, the sound source needs to be close to the sound source to normally pick up sound, which is actually based on the effect of the near-field effect, so that the use is inconvenient. And the miaow head structure of this application is through setting up the reposition of redundant personnel passageway, then has solved these problems betterly, realizes that the miaow head input sound wave is full then overflow, the then relative stable state is mended to the deficiency, specific advantage: the microphone has balanced dynamic response, wide range, long pickup distance and strong pickup force. Because the sound quality is increased, the sound quality resistance is increased along with the increase of the frequency, the volume flow rate of the vibrating diaphragm at high frequency can be correspondingly reduced, namely, the sensitivity at high frequency is correspondingly inhibited, and the high-pitched sound is full and mellow.

The actual shunting channel plays a role similar to shunting and air leakage, so that bass in near field effect is not heavy and stuffy, and the bass sounds bright. The shunt channel has a good function, and the parameters of the side cavity and the vent hole need to be properly set according to actual needs. In order not to let the front chamber deflate too much, the side chambers are designed smaller, which will cause the air flow at both the air guiding structure and the air vent 11 to vibrate properly, and the sound will sound relaxed and resilient. And corresponding to the human voice middle frequency band, the airflow can generate the effect similar to piston vibration, so that the sound is easy and elastic and has considerable thickness; when the frequency gradually goes beyond the medium frequency and the middle-high frequency, the sound becomes light and bright, and each frequency band is dynamically connected stably and smoothly.

In summary, the capacitor microphone core with the shunt channel provided by the invention connects the front cavity and the vent hole through the shunt channel formed by the front sound hole, the front cavity, the air guide structural member, the side cavity and the vent hole which are connected in sequence, and has the advantages that: if the input sound airflow is too large, the sound airflow is divided from the front cavity to the vent hole through the sound dividing channel, so that the volume flow rate of the sound airflow flowing through the diaphragm is reduced, the sound airflow passing through the diaphragm is kept in a relatively constant range with small fluctuation, so that the vibration between the vibrating diaphragm and the back plate is relatively constant, the generated electric signal is relatively stable, the tone quality effect is improved, meanwhile, the noise is avoided, if the sound airflow is too small and the sound airflow passing through the diaphragm is insufficient, the shunt channel will lead the sound airflow outside the microphone core to the front cavity through the vent hole, superpose with original sound air current that is used in on the vibrating diaphragm, make the sound air current of flowing through on the vibrating diaphragm obtain the reinforcing, make the sound air current of flowing through on the vibrating diaphragm keep a relatively stable interval, improve the pickup distance, the sound sensitivity and the definition of sound.

It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.

Claims

1. A capacitor microphone core with a shunt channel, comprising: the device comprises a shell, and a vibrating diaphragm, a gasket, an acoustic assembly and a bottom plate which are sequentially arranged in the shell; be the ante-chamber between shell and the vibrating diaphragm, be equipped with the side chamber between the outside of vibrating diaphragm, gasket, acoustics subassembly and bottom plate and the shell, be equipped with the air guide structure of connecting ante-chamber and side chamber between the medial surface of shell and the vibrating diaphragm, the side of shell is equipped with the air vent, the terminal surface of shell is equipped with the phonate hole of advancing, wherein the phonate hole of advancing, ante-chamber, air guide structure, side chamber and air vent connect gradually.

2. The capacitive microphone core with shunt channels of claim 1, wherein the acoustic assembly comprises: the plastic cavity, and the back plate, the middle cavity ring, the damping plate and the back cavity ring which are arranged in the plastic cavity in sequence.

3. The capacitive microphone core with the shunt channel of claim 1, wherein a dust cloth is disposed on an outer end surface of the housing.

4. The capacitive microphone core with the shunt channel of claim 1, wherein the air guide structure is a metal mesh pad.

5. The capacitive microphone core with the shunt channel of claim 1, wherein the air guide structure is a plastic gasket with a vent groove.

6. The capacitive microphone core with shunt channels of claim 1, wherein the air guide structure is a groove on the inner end surface of the housing.

7. The capacitive microphone core with shunt channels of claim 1, wherein the vent is a through hole formed in a side of the housing.

8. The capacitive microphone core with the shunt channel of claim 1, wherein the bottom plate is provided with a vent hole.