CN2715447Y - Front back electret type capacitor microphone - Google Patents
Front back electret type capacitor microphone Download PDFInfo
- Publication number
- CN2715447Y CN2715447Y CN 200320116976 CN200320116976U CN2715447Y CN 2715447 Y CN2715447 Y CN 2715447Y CN 200320116976 CN200320116976 CN 200320116976 CN 200320116976 U CN200320116976 U CN 200320116976U CN 2715447 Y CN2715447 Y CN 2715447Y
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- CN
- China
- Prior art keywords
- electret
- type
- microphone
- capacitor microphone
- front back
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 239000003990 capacitor Substances 0.000 title claims abstract description 13
- 230000005669 field effect Effects 0.000 claims abstract description 12
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 3
- 238000005538 encapsulation Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 10
- 239000000463 material Substances 0.000 abstract description 8
- 239000002994 raw material Substances 0.000 abstract description 3
- 239000000428 dust Substances 0.000 abstract description 2
- 239000012528 membrane Substances 0.000 abstract 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 8
- 208000002925 dental caries Diseases 0.000 description 4
- 230000010287 polarization Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 208000007514 Herpes zoster Diseases 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
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- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
The utility model discloses a front back electret type capacitor microphone. The technical proposal adopted by the utility model is that the microphone is packaged by a circular casing, the bottom of which is provided with acoustic pressure holes, and the external is plastered with non-woven fabrics used to shield the dust and adjust the acoustic pressure signal acting on the diaphragm. The circuit board has two sides of conducting layers to be plastered with electronic components such as field effect tubes and capacitors, and functions as outgoing junction of the microphone. The input terminal is bipolar capacity plate antenna, the electronegativity with single polarity on the electret surface is used as a permanent electrode. The front vibrating diaphragm type is adopted as the foundation design and the back of the electret is inverted. The ringing collection grid of the bandage membrane is conducted and the cavity is fixed to the support in one to finish the structural change of the microphone of the utility model. The front back electret type capacitor microphone effectively solves the processing difficulty of covering electret material on the bottom of the casing of the existing back electret type microphone, and the placing way of back electret widely improves the reuse time of the back electret raw material to reduce the cost.
Description
Technical field: the utility model relates to a kind of acoustical-electrical transducer that use in fields such as telephone set, mobile phone, intercom, radio-cassette player, voice-control toy that is widely used in, and specifically relates to a kind of front back electret type electret capacitor microphone.
Background technology: the design of common back-polar type microphone, mostly adopt copper ring 10 to connect backplane 4, the structure of outside cover cavity 3.Total structure need be made up of the zona that stretches tight, insulation gasket ring, vibrating diaphragm, shell, copper ring, cavity, backplane, wiring board, field effect transistor, electric capacity etc.Frame mode is tradition (referring to accompanying drawing 1) comparatively, adopt the shell 1 of bottom opening at first to put into diaphragm 16, again pad 18 is put on the diaphragm 16 to form the insulating barrier of capacity plate antenna, place respectively in the above again cavity 3, polarization and aging after backplane 4, place copper ring 10 then.Copper ring 10 need be higher than cavity 3 so that reliably contact with wiring board 5, seals the assembling of finishing whole microphone at last.The working method of the common back-polar type microphone of this kind is: after seeing through the dustcloth 11 that pastes on the shell 1 when a sound pressure signal, act on the diaphragm 16, diaphragm 16 beginnings are vibrated with the amplitude of acoustical signal, thereby change the spacing 2 that forms between diaphragm 16 and the backplane 4, capacity between the capacity plate antenna changes, potential change between corresponding capacity plate antenna two electrodes forms a current signal that changes with acoustical signal, pass through the transfer function of copper ring 10 again, the grid work of control field effect transistor 6, produce a signal of telecommunication synchronous with acoustical signal under the amplification of field effect transistor 6, whole acoustic-electric converts.Because existing market requires more and more littler thin more for novel microphone construction, produce and have stability and the better microphone of sound quality, just need to adopt the backplane polarization mode, could better solve the contradiction between oscillating mass and the charge polarization degree of depth and the stability, but the product of existing common back-polar type microphone is because backplane 4 is rear-mounted, need add certain pressure when encapsulation acts on respectively on zona 9 and the backplane 4, so backplane 4 and zona 9 requirement of strength when selection is higher, thickness can not change because of the needs of product, exists back-polar type product height dimension and can not do low, complex process, the cost height, shortcomings such as stability difference.
Summary of the invention: the purpose of this utility model is intended to overcome the deficiency that above-mentioned prior art exists, and provide a kind of front back electret type electret capacitor microphone of new structure, it has solved existing back-polar type microphone covers the electret material at outer casing bottom difficulty of processing effectively, and the backplane modes of emplacement has also improved the raw-material number of times that utilizes once more of backplane greatly, has reduced cost.Technical scheme that the utility model has been taked is, a kind of microphone is to use the circular housing encapsulation, and the acoustic pressure hole is opened in the bottom.The outer nonwoven fabrics that pastes covers dust and the regulating action sound pressure signal on vibrating diaphragm.Wiring board is divided into the two sides conductting layer mounting other electron components such as field effect transistor and electric capacity, and undertakes the output interconnect function of microphone.Input is the two poles of the earth capacity plate antenna, and the elecrtonegativity of the single polarity of electret surface electret is made permanent electrode.Diaphragm-vibrating type is a basic engineering before adopting, the electret back inversion type.The zona that stretches tight integrates gate turn-on, inner chamber fixed support, finishes the change on the utility model microphone construction.
The beneficial effects of the utility model are, characteristics such as technology is simple, cost is low, stability is strong, because adopting diaphragm-vibrating type is basic engineering, the electret back inversion type, the preceding backplane electret material that has solved the front back electret type product effectively attaches the problem of difficulty.The zona that stretches tight integrates gate turn-on, inner chamber fixed support, fully reduces raw material quantity and assembling link.Effectively increased microphone back cavity volume, reducing influences sound quality to the vibration of microphone.
Description of drawings: Fig. 1 is common back-polar type microphone construction schematic diagram
Fig. 2 is Figure 1B-B part-structure enlarged diagram
Fig. 3 is the utility model front back electret type electret capacitor microphone structural representation
Fig. 4 is Fig. 3 D-D partial structure enlarged diagram
1 shell, 2 diaphragms and backplane gap, 3 cavitys, 4 backplanes, 5 wiring boards (PCB), 6 field effect transistor (FET), 7 electric capacity, 8 resistance, 9 zonas, 10 copper rings, 11 dustcloths, 12 tone-entering holes, 13 back cavitys, 14 preceding cavitys, 15 backplane holes, 16 diaphragms, 17 electret materials, 18 pads among Fig. 1, Fig. 2
20 field effect transistor (FET), 21 solder joints, 22 electric capacity, 23 resistance, 24 wiring boards, 25 shells, 26 zonas, 27 cavitys, 28 backplanes, 29 dustcloths, 30 backplane holes, 31 tone-entering holes, 32 electret materials, 33 pads, 34 gaps, 35 diaphragms among Fig. 3, Fig. 4
In order to understand the utility model difference with the prior art better, adopt two kinds of different numerical reference modes for identical device name in the utility model accompanying drawing.Fig. 1, Fig. 2 are the mark of prior art, and Fig. 3, Fig. 4 are mark of the present utility model.
Embodiment: below in conjunction with description of drawings embodiment of the present utility model is further set forth, a kind of front back electret type electret capacitor microphone material is made up of self-adhesive type Air Filter, shell, back-polar type backplane, insulation gasket ring, dead ring, the zona that stretches tight, vibrating diaphragm, wiring board, field effect transistor, electric capacity etc. respectively.For the structure of existing back-polar type product, this no longer elaborates.As providing among the figure, the utility model organically combines diaphragm 35 and copper ring 10, needed tensile strength when stretching tight film with the height increase of copper ring, form the back cavity of microphone by the hollow of diaphragm 35, to hold the element that exposes behind the paster on the wiring board 24, the processing of backplane 28 is to leave one or more apertures 30 at the middle part, what this accompanying drawing provided is an aperture, the sound pressure signal that utilizes the outside to come in can act on the diaphragm 35 smoothly, backplane 28 still adopts the divergence type polarization mode, backplane 28 after being about to polarize and wear out is put into the gold-plated shell 25 of bottom wide-bore, shell 25 tappings should not cover the aperture of leaving on the backplane 28, backplane 28 does not have the one side of electret material towards shell 25 base apertures 30, owing to there is the balance of shell 25 bottoms to set off, so backplane 28 can be selected thickness according to actual conditions, the backplane 28 of the thinnest available 0.1mm, on backplane 28, put into pad 33, make pad 33 and backplane 28 that the one side and the plane contact of electret material be arranged, the thickness of pad 33 is exactly the thickness of the air dielectric layer of electric capacity, second of microphone acoustic compliance field just, change the thickness of pad 33, can change the capacity of electric capacity, reconcile the height of sensitivity, can also change the acoustic resistance of acoustic compliance field, thereby reach the purpose of regulating frequency response curve.Put into cavity 27 in shell 25, cavity 27 and shell 25 adopt the mode of matched in clearance, to utilize cavity 27 to drop on naturally on the pad 33, put into the diaphragm 35 of having electroplated and having bonded together with zona 26 again, cavity 27 and zona 26 matched in clearance have under the direction of diaphragm 35 and put into, and touch pad 33 up to zona 26, the cavity 27 that this moment, the part exposed later of zona 26 should be placed a little more than the outside is so that contact better with wiring board 24 behind the paster.Put into the wiring board 24 that has posted element at last, element downwards and seal.Working method is: after seeing through the dustcloth 29 that pastes on the shell 25 when a sound pressure signal, act on the diaphragm 35 along the sound hole on the backplane 28, diaphragm 35 beginnings are vibrated with the amplitude of acoustical signal, thereby change the spacing between diaphragm 35 and the backplane 28, capacity between the capacity plate antenna changes, potential change between corresponding capacity plate antenna two electrodes forms a current signal that changes with acoustical signal, pass through the transmission of zona 26 again, the grid work of control field effect transistor 20, produce at the signal of telecommunication that the amplification of field effect transistor is next and acoustical signal is synchronous, whole acoustic-electric converts.
Claims (4)
1, a kind of front back electret type electret capacitor microphone, form by self-adhesive type Air Filter, shell, back-polar type backplane, insulation gasket ring, dead ring, the zona that stretches tight, vibrating diaphragm, wiring board, field effect transistor, electric capacity etc. respectively, it is characterized in that the circular housing encapsulation, the acoustic pressure hole is opened in the bottom, pastes nonwoven fabrics outward.
2, front back electret type electret capacitor microphone according to claim 1, it is characterized in that wiring board is divided into the two sides conductting layer to mount other electron components such as field effect transistor and electric capacity, and undertake the output interconnect function of microphone, input is the two poles of the earth capacity plate antenna, and the elecrtonegativity of the single polarity of electret surface electret is as permanent electrode.
3, front back electret type electret capacitor microphone according to claim 1 is characterized in that it is basic engineering that vibrating diaphragm adopts preceding diaphragm-vibrating type, the electret back inversion type.
4, front back electret type electret capacitor microphone according to claim 1, the zona that it is characterized in that stretching tight integrates gate turn-on, inner chamber fixed support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320116976 CN2715447Y (en) | 2003-10-14 | 2003-10-14 | Front back electret type capacitor microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320116976 CN2715447Y (en) | 2003-10-14 | 2003-10-14 | Front back electret type capacitor microphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2715447Y true CN2715447Y (en) | 2005-08-03 |
Family
ID=34866469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320116976 Expired - Fee Related CN2715447Y (en) | 2003-10-14 | 2003-10-14 | Front back electret type capacitor microphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2715447Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788360A (en) * | 2008-08-26 | 2010-07-28 | 通用电气公司 | Resistive contact sensors for large blade and airfoil pressure measurements |
| CN101325815B (en) * | 2007-06-15 | 2012-10-10 | 深圳市豪恩电声科技有限公司 | Digital microphone and manufacturing method thereof |
| CN103079157A (en) * | 2012-12-28 | 2013-05-01 | 北京燕东微电子有限公司 | Impedance transformation and signal amplifier of integrated vocal cavity and capacitance type microphone |
| CN110300362A (en) * | 2019-07-18 | 2019-10-01 | 东莞市瑞勤电子有限公司 | Electret bone conduction vibrates microphone |
-
2003
- 2003-10-14 CN CN 200320116976 patent/CN2715447Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101325815B (en) * | 2007-06-15 | 2012-10-10 | 深圳市豪恩电声科技有限公司 | Digital microphone and manufacturing method thereof |
| CN101788360A (en) * | 2008-08-26 | 2010-07-28 | 通用电气公司 | Resistive contact sensors for large blade and airfoil pressure measurements |
| CN101788360B (en) * | 2008-08-26 | 2014-04-02 | 通用电气公司 | Resistive contact sensors for large blade and airfoil pressure measurements |
| CN103079157A (en) * | 2012-12-28 | 2013-05-01 | 北京燕东微电子有限公司 | Impedance transformation and signal amplifier of integrated vocal cavity and capacitance type microphone |
| CN103079157B (en) * | 2012-12-28 | 2015-07-15 | 北京燕东微电子有限公司 | Impedance transformation and signal amplifier of integrated vocal cavity and capacitance type microphone |
| CN110300362A (en) * | 2019-07-18 | 2019-10-01 | 东莞市瑞勤电子有限公司 | Electret bone conduction vibrates microphone |
| CN110300362B (en) * | 2019-07-18 | 2024-06-07 | 东莞市瑞勤电子有限公司 | Electret bone conduction vibration microphone |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Huang Guibiao Document name: Notification of Termination of Patent Right |
|
| 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 |