CN2634770Y - One-way capacitor microphone - Google Patents
One-way capacitor microphone Download PDFInfo
- Publication number
- CN2634770Y CN2634770Y CN 03268523 CN03268523U CN2634770Y CN 2634770 Y CN2634770 Y CN 2634770Y CN 03268523 CN03268523 CN 03268523 CN 03268523 U CN03268523 U CN 03268523U CN 2634770 Y CN2634770 Y CN 2634770Y
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- metal shell
- vibrating membrane
- sound
- backboard
- effect transistor
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Abstract
The utility model relates to a unidirectional capacitance microphone. The printed circuit board in the metal shell of the utility model is provided with a plurality of back sound through holes and field effect transistors. The inner part of the metal shell is provided with a circular cowling; a cover-shaped metal connector is arranged in the internal side of the circular cowling; a polytetrafluoroethylene filter is arranged in the internal side of the connector; the front of the circular cowling is provided with a back boxing and a vibrating membrane; a certain distance is kept between the vibrating membrane and the back boxing by using a washer as a medium. The front sealing surface of the metal shell is provided with a plurality of outward trumpet-shaped front sound through holes and is pasted with nonwoven fabrics on the external side. The utility model is provided with hundreds of micrometer high density polytetrafluoroethylene filter as an acoustic resistance antibody in the cover-shaped metal connector to realize the miniaturization, and the sensitivity difference between the front sound and the back sound can be fully assured, therefore, the unidirectional effect can be improved significantly. The utility model has the advantages of miniaturized in the whole size, good sensitivity and directing performance and low manufacturing cost.
Description
Technical field
The utility model relates to a kind of microphone, specifically a kind of unidirectional condenser microphone.
Background technology
We know, no matter are to obtain the acoustics that voice signal carries out reprocessing from the outside, still are used for the communication equipment (particularly carrying communication terminal) of exchange audio, all must adopt microphone for voice signal being converted to the signal of telecommunication.Existing common orthotype condenser microphone mainly is made up of metal shell, vibrating membrane, backboard, ring-type connector, backplane support, field-effect transistor, sintering filter, printed circuit board (PCB), nonwoven fabrics.Printed circuit board (PCB) covers the rear portion of corresponding orthotype condenser microphone, and its downside is provided with field-effect transistor, and metal shell inside is provided with the ring-type connector, and the sintering filter is equipped with in ring-type connector inboard, also is provided with vibrating membrane and backboard in the metal shell.The manufacturing of the most of employing of metal shell aluminium is the assembly that is used for fixing relevant microphone, prevents that foreign matter from entering from the outside, prevents the containment vessel that the external electric signal noise flows into simultaneously.Vibrating membrane adopts vacuum to ooze the manufacturing of Ni method with polyester slice or PPS thin slice mostly, and its effect is to keep under the state at fine interval with backboard described later, makes the variable in distance that shakes generation by outside sound wave change the variation of capacitance into.The continuant orifice that some is arranged above the backboard is to adhere to the FEP thin slice on the employing corrosion resistant plate to be stamped to form, and charges under the high pressure of number KV usually and plays the effect of back pole plate.The ring-type connector is for pin that connects field-effect transistor described later and above-mentioned backboard, and its ring-type connector carries out gold-plated forming after the punching press with brass substantially.Backplane support and above-mentioned backboard and above-mentioned ring-type connector fit together, and play the effect of combined support and insulator.Field-effect transistor converts above-mentioned vibrating membrane electric capacitance change to impedance variation, has the output impedance converter function that its variable signal is delivered to the rear end amplifier.Printed circuit board (PCB) plays the lead-out terminal effect, and is provided with the continuant orifice of some.The sintering filter has the effect of acoustic resistance antibody on the one hand, and the sound that the continuant orifice by above-mentioned printed circuit board (PCB) of can also decaying on the other hand flows into makes corresponding orthotype condenser microphone have one-way.In order to prevent that dust or foreign matter from entering, the front screen pack that directed condenser microphone front has adopted nonwoven fabrics to make.The continuant orifice of front sound by front filter and metal shell enters microphone and causes the vibrating membrane vibrations.Vibrating membrane causes vibrations by sound wave, because of its vibrations make it and backboard between produce variable in distance, its variable in distance causes the variation of corresponding capacitance, finishes mechanical wave (sound wave) to the conversion of electric wave thereby field-effect transistor obtains electric capacitance change.To this, the back sound passes through the back sound of above-mentioned printed circuit board (PCB) by behind the hole, and directly by the sintering filter attenuation as acoustic resistance antibody, the sound wave of this decay shakes above-mentioned vibrating membrane.Because the backside reflection sound diminishes with respect to front sound amplitude, thereby has had omnirange, unidirectional characteristics.The sintering filter of such one-way type microphone metal shell inside is to be made by the resin sintering, the certain thickness of abundant decay needs for above-mentioned front sound, back sound, cause that volume is big, sensitivity and directional characteristic be poor, is difficult to obtain best unicity effect.
Summary of the invention
Technical problem to be solved in the utility model is to overcome above-mentioned the deficiencies in the prior art, provides that a kind of overall dimensions miniaturization, sensitivity and directional characteristic are good, the unidirectional condenser microphone of low cost of manufacture.
The technical scheme in the invention for solving the above technical problem is: a kind of unidirectional condenser microphone, it is provided with metal shell, vibrating membrane, backboard, printed circuit board (PCB), field-effect transistor, nonwoven fabrics, it is characterized in that: the printed circuit board (PCB) in the metal shell is provided with a plurality of back sound and feeds the hole, and be furnished with and detect the required field-effect transistor of voice signal, metal shell inside is provided with collector ring, the collector ring inboard is equipped with and is covered the shape metal connector, the polytetrafluoroethylene filter is equipped with in lid shape metal connector inboard, lid shape metal connector front also is provided with backboard and vibrating membrane, backboard is provided with a plurality of continuant orifices, vibrating membrane is that media and backboard keep a determining deviation with the packing ring, the metal shell front end face is provided with several export-oriented horn-like front sounds by the hole, and nonwoven fabrics is posted in the outside.Constitute a kind of front sound unicity microphone like this.
The utility model vibrating membrane shakes with sound by above-mentioned polytetrafluoroethylene filter with by the interaction production of above-mentioned front sound by the sound in hole, just can detect variable in distance.What specify is that sound by above-mentioned polytetrafluoroethylene filter is to have passed through the back sound that above-mentioned back sound feeds the hole, its back sound is decayed in the effect of above-mentioned polytetrafluoroethylene filter, with compare by the front sound in hole by above-mentioned front sound, sound level diminishes, and has front sound unicity.
Above-mentioned backboard is filled electric charge with and is connected with the grid of above-mentioned field-effect transistor, adopts the diaphragm of above-mentioned vibrating membrane to contact back formation circuit with above-mentioned metal shell conduction, and this microphone just constitutes the back-polar type electret.
Above-mentioned backboard is connected with the grid of above-mentioned field-effect transistor, stored charge on the above-mentioned vibrating membrane and form circuit with above-mentioned metal shell conducting, and this microphone constitutes the paper tinsel electret.
The another kind of technical scheme of the utility model is: a kind of unidirectional condenser microphone, it is provided with metal shell, vibrating membrane, printed circuit board (PCB), field-effect transistor, nonwoven fabrics, it is characterized in that: the printed circuit board (PCB) in the metal shell is provided with a plurality of back sound and feeds the hole, and be furnished with and detect the required field-effect transistor of voice signal, metal shell inside is provided with collector ring, the collector ring inboard is equipped with and is covered the shape metal connector, the polytetrafluoroethylene filter is equipped with in lid shape metal connector inboard, lid shape metal connector front is provided with vibrating membrane, vibrating membrane is that media and metal shell front end medial surface keep a determining deviation with the packing ring, and metal shell front end medial surface is full of electric charge; The metal shell front end face is provided with several export-oriented horn-like front sounds by the hole, and nonwoven fabrics is posted in the outside.Vibrating membrane shakes with sound by above-mentioned polytetrafluoroethylene filter with by the interaction production of above-mentioned front sound by the sound in hole, just can detect variable in distance.
Adopt the diaphragm of above-mentioned vibrating membrane to be connected with the grid of above-mentioned field-effect transistor, this microphone constitutes the diaphragm-vibrating type electret.
The utility model is because the shape metal connector is covered in employing, and side disposes hundreds of microns high density polytetrafluoroethylene filter as acoustic resistance antibody within it, compare with the situation of using resin sintering filter, can realize miniaturization, ensure simultaneously fully sensitivity poor of front sound and back sound, thereby significantly improved the one-way effect.Against existing technologies, good, the low cost of manufacture of the miniaturization of the utility model overall dimensions, sensitivity and directional characteristic.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is structure of the present utility model (back-polar type electret) schematic diagram.
Fig. 2 is another kind of structure of the present utility model (diaphragm-vibrating type electret) schematic diagram.
Fig. 3 is the utility model lid shape metal connector structural representation.
Fig. 4 is the utility model metal shell structural map.
1. metal shells among the figure, 2. printed circuit board (PCB), 3. back sound feeding hole, 4. field-effect transistor, 5. collector ring, 6. lid shape metal connector, 7. polytetrafluoroethylene filter, 8. backboard, 9. vibrating membrane, 10. vibrating membrane supporting ring, 11. continuant orifice, 12. the front sound is by hole, 13. nonwoven fabrics, 14. packing rings.
Embodiment
As can be seen from Figure 1, a kind of unidirectional condenser microphone, it is provided with metal shell 1, printed circuit board (PCB) 2, field-effect transistor 4, backboard 8, vibrating membrane 9, nonwoven fabrics 13.Metal shell 1 most of employing aluminium manufacturing is the assembly that is used for fixing relevant microphone, prevents that foreign matter from entering from the outside, prevents the containment vessel that the external electric signal noise flows into simultaneously.Metal shell 1 inside has the printed circuit board (PCB) 2 of lead-out terminal function, printed circuit board (PCB) 2 is provided with and can feeds hole 3 by a plurality of back sound of back sound, the bottom surface of printed circuit board (PCB) 2 also disposes field-effect transistor 4, field-effect transistor 4 converts the vibrating membrane electric capacitance change to impedance variation, has the output impedance converter function that its variable signal is delivered to the rear end amplifier.
At metal shell 1 internal configurations collector ring 5, shape metal connector 6 is covered in the configuration of the inboard of collector ring 5, plays hundreds of microns high density polytetrafluoroethylene filter 7 of acoustic resistance antibody function in the 6 inboard configurations of lid shape metal connector.Owing to adopted above-mentioned lid shape metal connector 6, its downside to guarantee the required sympathetic response space of the corresponding microphone output sound level of substantial correction, had direction-sense unicity microphone thereby provide at the front sound.The configuration of lid shape metal connector 6 downsides can be filled the backboard 8 that adds electric charge, and this backboard 8 is provided with the continuant orifice 11 of some.Above-mentioned backboard 8 downsides configuration vibrating membrane 9 has packing ring 14 between them, this backboard 8 is kept a determining deviation, vibrating membrane 9 downsides configuration vibrating membrane supporting ring 10.The vibrating membrane support ring is to be stamped to form with corrosion resistant plate, and purpose is to support above-mentioned vibrating membrane.
Lid shape metal connector 6 shown in Figure 3 is removed the one end and is used to install outside the support zone of polytetrafluoroethylene filter 7, and other positions are opening structure.
With reference to Fig. 4 as can be known, an end of metal shell 1 is provided with some fronts sound by hole 12, and this front sound is export-oriented horn-like by the hole on respective metal shell front end face cross section, promptly form export-oriented expander shape, thus the sensitivity that has improved this microphone.
The nonwoven fabrics 13 that prevents that foreign matter from entering has also been installed in the front end outside at above-mentioned metal shell 1.
Above-mentioned backboard 8 is filled electric charge with and is connected with the grid of above-mentioned field-effect transistor 4, adopts the diaphragm of above-mentioned vibrating membrane to contact back formation circuit with above-mentioned metal shell conduction, and this microphone just constitutes the back-polar type electret.
Above-mentioned backboard 8 is connected with the grid of above-mentioned field-effect transistor 4, stored charge on the above-mentioned vibrating membrane and form circuit with above-mentioned metal shell conducting, and this microphone constitutes the paper tinsel electret.
In the tone lateralization type microphone of above-mentioned back-polar type electret front, the front sound makes vibrating membrane 9 vibrations by the front sound of above-mentioned nonwoven fabrics 13 and above-mentioned metal shell 1 by hole 12, and the vibrations of dependence vibrating membrane 9, the variable in distance that takes place between the backboard 8 is communicated to above-mentioned field-effect transistor 4 and obtains the signal of telecommunication.To this, the back sound feeds hole 3 by the back sound of above-mentioned printed circuit board (PCB) 2, via above-mentioned polytetrafluoroethylene filter 7.Though after this back sound is decayed in above-mentioned polytetrafluoroethylene filter 7, sound wave by above-mentioned backboard 8 is communicated to above-mentioned vibrating membrane 9 by continuant orifice 11, but because its back sound is for the state by above-mentioned polytetrafluoroethylene filter 7 decay, so can not fully shake above-mentioned vibrating membrane 9.Thereby the back sound is compared with above-mentioned front sound, and its sound level significantly diminishes, and has fully ensured the front sound one-way effect of this microphone.
Shown in Figure 2 is according to a kind of diaphragm-vibrating type electret of the utility model unidirectional microphones structural map.
With reference to Fig. 2 as can be known, the difference of diaphragm-vibrating type electret front sound one-way microphone and structure shown in Figure 1 is: the front end medial surface charge charging of above-mentioned metal shell 1 and play the back pole plate function dispenses the structure of backboard simultaneously.It is at metal shell 1 internal configurations collector ring 5, and shape metal connector 6 is covered in the configuration of the inboard of collector ring 5, plays hundreds of microns high density polytetrafluoroethylene filter 7 of acoustic resistance antibody function in the 6 inboard configurations of lid shape metal connector.Lid shape metal connector 6 downsides configuration vibrating membrane 9 has packing ring 14 between vibrating membrane 9 and the metal shell 1 front end medial surface, and to keep a determining deviation, metal shell 1 front end medial surface is full of electric charge; Vibrating membrane 9 upsides configuration vibrating membrane supporting ring 10.The vibrating membrane support ring is to be stamped to form with corrosion resistant plate.The diaphragm of vibrating membrane 9 is connected with the grid of field-effect transistor 4.
In the tone lateralization type microphone of above-mentioned diaphragm-vibrating type electret front, the front sound makes vibrating membrane 9 vibrations by the front sound of above-mentioned nonwoven fabrics 13 and above-mentioned metal shell 1 by hole 12, the back sound feeds hole 3 by the back sound of above-mentioned printed circuit board (PCB) 2, via above-mentioned polytetrafluoroethylene filter 7.Though this back sound is communicated to above-mentioned vibrating membrane 9 after decaying in above-mentioned polytetrafluoroethylene filter 7, because its back sound is for the state by above-mentioned polytetrafluoroethylene filter 7 decay, so can not fully shake above-mentioned vibrating membrane 9.Thereby the back sound is compared with above-mentioned front sound, and its sound level significantly diminishes, and has fully ensured the front sound one-way effect of this microphone.
As mentioned above, in based on one-way microphone of the present invention, be disposed at and cover shape metal connector inboard, hundreds of microns high density polytetrafluoroethylene filter as acoustic resistance antibody, compare with the situation of using resin sintering filter, can realize miniaturization, ensure simultaneously fully sensitivity poor of front sound and back sound, thereby significantly improved the one-way effect.
Claims (5)
1. unidirectional condenser microphone, it is provided with metal shell, vibrating membrane, backboard, printed circuit board (PCB), field-effect transistor, nonwoven fabrics, it is characterized in that: the printed circuit board (PCB) in the metal shell is provided with a plurality of back sound and feeds the hole, and be furnished with and detect the required field-effect transistor of voice signal, metal shell inside is provided with collector ring, the collector ring inboard is equipped with and is covered the shape metal connector, the polytetrafluoroethylene filter is equipped with in lid shape metal connector inboard, lid shape metal connector front also is provided with backboard and vibrating membrane, backboard is provided with a plurality of continuant orifices, vibrating membrane is that media and backboard keep a determining deviation with the packing ring, the metal shell front end face is provided with several export-oriented horn-like front sounds by the hole, and nonwoven fabrics is posted in the outside.
2. unidirectional condenser microphone according to claim 1 is characterized in that: said backboard is full of electric charge and is connected with the grid of said field-effect transistor, and the diaphragm of said vibrating membrane and said metal shell conduction are connected to form circuit, are back-polar type electret build.
3. unidirectional condenser microphone according to claim 1 is characterized in that: said backboard is connected with the grid of said field-effect transistor, and the circuit of formation of savings electric charge and said metal shell conducting is paper tinsel electret build on the said vibrating membrane.
4. unidirectional condenser microphone, it is provided with metal shell, vibrating membrane, printed circuit board (PCB), field-effect transistor, nonwoven fabrics, it is characterized in that: the printed circuit board (PCB) in the metal shell is provided with a plurality of back sound and feeds the hole, and be furnished with and detect the required field-effect transistor of voice signal, metal shell inside is provided with collector ring, the collector ring inboard is equipped with and is covered the shape metal connector, the polytetrafluoroethylene filter is equipped with in lid shape metal connector inboard, lid shape metal connector front is provided with vibrating membrane, vibrating membrane is that media and metal shell front end medial surface keep a determining deviation with the packing ring, metal shell front end medial surface is full of electric charge, the metal shell front end face is provided with several export-oriented horn-like front sounds by the hole, and nonwoven fabrics is posted in the outside.
5. unidirectional condenser microphone according to claim 4 is characterized in that: adopt the diaphragm of above-mentioned vibrating membrane to be connected with the grid of field-effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03268523 CN2634770Y (en) | 2003-06-24 | 2003-06-24 | One-way capacitor microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03268523 CN2634770Y (en) | 2003-06-24 | 2003-06-24 | One-way capacitor microphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2634770Y true CN2634770Y (en) | 2004-08-18 |
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ID=34299450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03268523 Expired - Fee Related CN2634770Y (en) | 2003-06-24 | 2003-06-24 | One-way capacitor microphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2634770Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1820539B (en) * | 2005-07-08 | 2012-03-21 | 宝星电子株式会社 | Electret microphone comprising spring washer |
| CN102665161A (en) * | 2011-06-27 | 2012-09-12 | 美国通用微机电***公司 | Single-chip silicon microphone |
| CN102957992A (en) * | 2011-08-15 | 2013-03-06 | 哈曼国际工业有限公司 | Dual backplate microphone |
| CN107687890A (en) * | 2017-10-20 | 2018-02-13 | 中国计量大学 | Vector microphone with horn structure |
| CN109565623A (en) * | 2016-09-01 | 2019-04-02 | 松下知识产权经营株式会社 | Speaker unit and mobile body device equipped with the speaker unit |
-
2003
- 2003-06-24 CN CN 03268523 patent/CN2634770Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1820539B (en) * | 2005-07-08 | 2012-03-21 | 宝星电子株式会社 | Electret microphone comprising spring washer |
| TWI381748B (en) * | 2005-07-08 | 2013-01-01 | Bse Co Ltd | Electret microphone include washer spring |
| CN102665161A (en) * | 2011-06-27 | 2012-09-12 | 美国通用微机电***公司 | Single-chip silicon microphone |
| CN102957992A (en) * | 2011-08-15 | 2013-03-06 | 哈曼国际工业有限公司 | Dual backplate microphone |
| CN109565623A (en) * | 2016-09-01 | 2019-04-02 | 松下知识产权经营株式会社 | Speaker unit and mobile body device equipped with the speaker unit |
| CN107687890A (en) * | 2017-10-20 | 2018-02-13 | 中国计量大学 | Vector microphone with horn structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |