CN205160786U - Capacitive microphone - Google Patents
Capacitive microphone Download PDFInfo
- Publication number
- CN205160786U CN205160786U CN201520882986.XU CN201520882986U CN205160786U CN 205160786 U CN205160786 U CN 205160786U CN 201520882986 U CN201520882986 U CN 201520882986U CN 205160786 U CN205160786 U CN 205160786U
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- Prior art keywords
- effect transistor
- electret
- vibrating diaphragm
- electric capacity
- field
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- 230000005669 field effect Effects 0.000 claims abstract description 31
- 239000003990 capacitor Substances 0.000 claims abstract description 28
- 230000008859 change Effects 0.000 claims description 6
- 230000010355 oscillation Effects 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 abstract 2
- 230000005611 electricity Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The utility model discloses a capacitive microphone, include: packaging structure by circuit board and shell are constituteed is equipped with electronic components on the circuit board, the shell bottom is equipped with the sound hole of receiving the voice signal, and the inside shell bottom that is close to of packaging structure is equipped with the parallel plate capacitor who comprises vibrating diaphragm, gasket and polar plate, parallel plate capacitor electricity interconnecting link board, wherein, the polar plate of polar plate for getting rid of the electret. The utility model discloses got rid of the electret on the polar plate, avoided to stay because of the electret and deposited a small amount of electric charge and lead to pushing down loudly and still have the condition of opening the voltage generation distortion that is less than field effect transistor, and connect an electric capacity between field effect transistor's grid and source electrode, and incoming signal further falls, and make high acoustic pressure incoming signal be greater than field effect transistor's starting voltage to can thicken the gasket between polar plate and the vibrating diaphragm, increase the vibrations space of vibrating diaphragm, thereby reduce the distortion, improve the acoustics overload point of microphone.
Description
Technical field
The utility model relates to electroacoustic field, particularly a kind of Electret Condencer Microphone.
Background technology
Electric capacitor microphone (ElectretCapacitanceMicrophone, ECM), because of the feature that volume is little, structure is simple, electroacoustic performance is good, price is low, is widely used.But due to the field-effect transistor (FieldEffectTransistor of ECM inside, FET) restriction of cut-in voltage, the acoustics overload point of EMC is not high, Fig. 4 is the schematic diagram of the plane-parallel capacitor output signal of telecommunication in existing EMC, as shown in Figure 4, once plane-parallel capacitor in EMC receives the signal of telecommunication that high sound pressure converts to the cut-in voltage (as-0.7V) lower than field-effect transistor FET, signal will produce distortion.
Utility model content
To produce the problem of distortion lower than the cut-in voltage of field-effect transistor in order to solve the signal of telecommunication that existing electric capacitor microphone converts to due to high sound pressure, the utility model provides a kind of Electret Condencer Microphone, comprising:
The encapsulating structure be made up of wiring board (201) and shell (202), described wiring board (201) is provided with electronic devices and components, described shell (202) bottom is provided with the acoustic aperture (203) receiving voice signal, described encapsulating structure is inner is provided with near described outer casing bottom the plane-parallel capacitor be made up of vibrating diaphragm (204), pad (205) and pole plate (206), and described plane-parallel capacitor is electrically connected described wiring board (201); It is characterized in that, described pole plate (206) is the pole plate removing electret.
Preferably, described pad (205) is the pad (301) thickeied, for increasing the oscillation space of vibrating diaphragm.
Preferably, the described wiring board of described encapsulating structure inside is provided with field-effect transistor (207), and the grid of described field-effect transistor (207) and source electrode are electrically connected described pole plate (206) and described vibrating diaphragm (204) respectively.
Preferably, the described wiring board (201) of described encapsulating structure inside is provided with the first electric capacity (208), and two links of described first electric capacity (208) are electrically connected grid and the source electrode of described field-effect transistor (207) respectively; Described first electric capacity (208), for the change suppressing described plane-parallel capacitor to export the signal of telecommunication.
Preferably, the described wiring board (201) of described encapsulating structure inside is provided with the second electric capacity (209), and two links of described second electric capacity (209) are electrically connected drain electrode and the source electrode of described field-effect transistor (207) respectively.
The beneficial effect of the utility model embodiment is: eliminate the electret on pole plate, avoid because electret understands the situation still having the cut-in voltage generation distortion lower than field-effect transistor under a small amount of electric charge of resident causes high sound pressure, improve the acoustics overload point of microphone.
Accompanying drawing explanation
Fig. 1 is the profile of existing ECM;
The profile of the Electret Condencer Microphone that Fig. 2 provides for the utility model embodiment;
The profile of the Electret Condencer Microphone that Fig. 3 provides for another embodiment of the utility model;
Fig. 4 is the schematic diagram that in existing ECM, plane-parallel capacitor exports the signal of telecommunication;
The circuit diagram of the Electret Condencer Microphone that Fig. 5 provides for the utility model embodiment;
In the Electret Condencer Microphone that Fig. 6 provides for the utility model embodiment and existing ECM, plane-parallel capacitor exports the comparison diagram of the signal of telecommunication.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model execution mode is described in further detail.
Fig. 1 is the profile of existing ECM.As shown in Figure 1, the pole plate 101 of existing ECM is attached with one deck electret 102, electret 102 is a kind of dielectric, and after high voltage electric field electret, two sides has the charges of different polarity stationed respectively, and polarization phenomena are not removed with external electric field and disappear completely.The plane-parallel capacitor formed with the pole plate of electret is with electric charge, when receiving high sound pressure voice signal, ultimate range between vibrating diaphragm and pole plate increases thereupon, the ac signal peak value absolute value exported also increases, when ac signal peak negative voltage is less than the cut-in voltage of field-effect transistor, field-effect transistor just effectively can not amplify microphone input signal, thus produces distortion.
The profile of the Electret Condencer Microphone that Fig. 2 provides for the utility model embodiment.As shown in Figure 2, a kind of Electret Condencer Microphone that the utility model provides, comprising: the encapsulating structure be made up of wiring board 201 and shell 202, is provided with the acoustic aperture 203 receiving voice signal bottom shell 202.Encapsulating structure is inner is provided with the plane-parallel capacitor be made up of vibrating diaphragm 204, pad 205 and pole plate 206, plane-parallel capacitor electrical interconnection plate 201 bottom shell 202.Encapsulating structure inner side is provided with grating ring 210, the bottom electrical of grating ring 210 connects pole plate 206, the upper electrical link plate 201 of grating ring 210, achieves the electrical connection between pole plate 206 and wiring board 201 by grating ring 210 like this, and grating ring 210 also plays the effect supporting wiring board 201 simultaneously.
Compared with prior art, pole plate 206 is no longer attached with electret, avoids because electret understands the situation still having the cut-in voltage generation distortion lower than field-effect transistor under a small amount of electric charge of resident causes high sound pressure.
The profile of the Electret Condencer Microphone that Fig. 3 provides for another embodiment of the utility model.As shown in Figure 3, in the Electret Condencer Microphone that the present embodiment provides, pad 205 in Fig. 2 changes the pad 301 of thickening into, in order to increase the oscillation space of vibrating diaphragm 302 in Fig. 3, make the plane-parallel capacitor of Electret Condencer Microphone when receiving high sound pressure signal, vibrating diaphragm 302 has enough vibrations spaces, thus reduces microphone distortion, improves the acoustics overload point of microphone.
In the utility model one embodiment, wiring board 201 is provided with field-effect transistor 207, the first electronic devices and components such as electric capacity 208, second electric capacity 209 grade.
The grid of field-effect transistor 207 and source electrode are electrically connected pole plate 206 and vibrating diaphragm 204 respectively.Signal of telecommunication plane-parallel capacitor being generated because vibrating diaphragm 204 vibrates is very faint, and internal resistance is very high, can not directly be connected with external circuit, field-effect transistor 207 is set and the signal of telecommunication that plane-parallel capacitor exports can be enlarged into external circuit signal used, and carry out impedance transformation.
The circuit diagram of the Electret Condencer Microphone that Fig. 5 provides for the utility model embodiment.As shown in Figure 5, vibrating diaphragm 204 and pole plate 206 are as two pole plates, the insulating air layer formed by pad 205 constitutes a plane-parallel capacitor C, when vibrating diaphragm 204 receives voice signal, vibration causes vibrating diaphragm 204 to change with the spacing of pole plate 206, the electric capacity of plane-parallel capacitor C can change thereupon, thus exports the signal of telecommunication to reflect the change of voice signal.
Two links of plane-parallel capacitor C are electrically connected grid and the source electrode of field-effect transistor FET respectively, for the voice signal received is converted into the signal of telecommunication; Field-effect transistor FET is used for the signal of telecommunication that amplification parallel plate capacitor C exports, and carries out impedance transformation, makes this signal of telecommunication be suitable for being used by external circuit.
In the utility model one preferred embodiment, the grid of field-effect transistor FET and the indirect first electric capacity C1 of source electrode, for the change suppressing plane-parallel capacitor C to export the signal of telecommunication, the signal of telecommunication that field-effect transistor FET is received is no more than it can the scope of Received signal strength, thus minimizing microphone distortion, improve the acoustics overload point of microphone.
In another preferred embodiment of the utility model, between the drain electrode of field-effect transistor FET and source electrode, one or more electric capacity can also be connect, as the second electric capacity C2, the 3rd electric capacity C3 etc., in order to effectively to reduce microphone distortion, reduce noise.
In the Electret Condencer Microphone that Fig. 6 provides for the utility model embodiment and existing ECM, plane-parallel capacitor exports the comparison diagram of the signal of telecommunication.As shown in Figure 6, when receiving same sound pressure signal, the signal of telecommunication 602 that existing EMC plane-parallel capacitor changes into, lower than the cut-in voltage of field-effect transistor FET, can produce distortion; The signal of telecommunication 601 that the Electret Condencer Microphone plane-parallel capacitor that the utility model embodiment provides changes into is higher than the cut-in voltage of field-effect transistor FET, and field-effect transistor FET normally works, and avoids distortion.
In sum, a kind of Electret Condencer Microphone that the utility model provides, compared with prior art, has following beneficial effect:
1, the Electret Condencer Microphone that the utility model embodiment provides eliminates the electret on pole plate, avoids because electret understands the situation still having the cut-in voltage generation distortion lower than field-effect transistor under a small amount of electric charge of resident causes high sound pressure.
2, the Electret Condencer Microphone that the utility model embodiment provides has thickeied the pad between pole plate and vibrating diaphragm, makes vibrating diaphragm have enough vibrations spaces when receiving high sound pressure signal, thus reduces distortion, improves the acoustics overload point of microphone.
3, the grid of Electret Condencer Microphone scene effect transistor that provides of the utility model embodiment and an indirect electric capacity of source electrode, reduce microphone input signal further, make high sound pressure input signal be greater than the starting resistor of field-effect transistor, avoid distortion.
The foregoing is only preferred embodiment of the present utility model, be not intended to limit protection range of the present utility model.All do within spirit of the present utility model and principle any amendment, equivalent replacement, improvement etc., be all included in protection range of the present utility model.
Claims (5)
1. an Electret Condencer Microphone, comprise: the encapsulating structure be made up of wiring board (201) and shell (202), described shell (202) bottom is provided with the acoustic aperture (203) receiving voice signal, described encapsulating structure is inner is provided with near described outer casing bottom the plane-parallel capacitor be made up of vibrating diaphragm (204), pad (205) and pole plate (206), and described plane-parallel capacitor is electrically connected described wiring board (201) by grating ring (210); It is characterized in that, described pole plate (206) is the pole plate removing electret.
2. Electret Condencer Microphone as claimed in claim 1, is characterized in that, described pad (205) is the pad (301) thickeied, for increasing the oscillation space of vibrating diaphragm (302).
3. Electret Condencer Microphone as claimed in claim 1, it is characterized in that, the described wiring board of described encapsulating structure inside is provided with field-effect transistor (207), and the grid of described field-effect transistor (207) and source electrode are electrically connected described pole plate (206) and described vibrating diaphragm (204) respectively.
4. Electret Condencer Microphone as claimed in claim 3, it is characterized in that, the described wiring board (201) of described encapsulating structure inside is also provided with the first electric capacity (208), and two links of described first electric capacity (208) are electrically connected grid and the source electrode of described field-effect transistor (207) respectively;
Described first electric capacity (208), for the change suppressing described plane-parallel capacitor to export the signal of telecommunication.
5. Electret Condencer Microphone as claimed in claim 4, it is characterized in that, the described wiring board (201) of described encapsulating structure inside is also provided with at least one second electric capacity (209), and two links of described second electric capacity (209) are electrically connected drain electrode and the source electrode of described field-effect transistor (207) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520882986.XU CN205160786U (en) | 2015-11-06 | 2015-11-06 | Capacitive microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520882986.XU CN205160786U (en) | 2015-11-06 | 2015-11-06 | Capacitive microphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205160786U true CN205160786U (en) | 2016-04-13 |
Family
ID=55696423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520882986.XU Active CN205160786U (en) | 2015-11-06 | 2015-11-06 | Capacitive microphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205160786U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109379684A (en) * | 2018-10-09 | 2019-02-22 | 歌尔股份有限公司 | Microphone and electronic equipment |
| CN111383587A (en) * | 2018-12-28 | 2020-07-07 | 乐金显示有限公司 | Display microphone device |
-
2015
- 2015-11-06 CN CN201520882986.XU patent/CN205160786U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109379684A (en) * | 2018-10-09 | 2019-02-22 | 歌尔股份有限公司 | Microphone and electronic equipment |
| CN111383587A (en) * | 2018-12-28 | 2020-07-07 | 乐金显示有限公司 | Display microphone device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 261031 Dongfang Road, Weifang high tech Industrial Development Zone, Shandong, China, No. 268 Patentee after: Goertek Inc. Address before: 261031 Dongfang Road, Weifang high tech Industrial Development Zone, Shandong, China, No. 268 Patentee before: Goertek Inc. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200617 Address after: 266104 room 103, 396 Songling Road, Laoshan District, Qingdao, Shandong Province Patentee after: Goer Microelectronics Co.,Ltd. Address before: 261031 Dongfang Road, Weifang high tech Industrial Development Zone, Shandong, China, No. 268 Patentee before: GOERTEK Inc. |