CN101500187A - Single directivity capacitor type microphone unit and linear microphone - Google Patents
Single directivity capacitor type microphone unit and linear microphone Download PDFInfo
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- CN101500187A CN101500187A CNA2009100099482A CN200910009948A CN101500187A CN 101500187 A CN101500187 A CN 101500187A CN A2009100099482 A CNA2009100099482 A CN A2009100099482A CN 200910009948 A CN200910009948 A CN 200910009948A CN 101500187 A CN101500187 A CN 101500187A
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- oscillating plate
- acoustics
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Abstract
A unity directivity capacitance microphone unit and a linear microphone are the capacitance microphone sensor for preventing the wind noise and helping for acoustic quality of the low frequency acoustic wave from the front side of a vibration plate to the rear side. A tubular groove (221) having vested acoustic quality between end plates of a unit housing (10) is formed at other end surface of a vibration plate (21), where a bearing ring (22) of the vibration plate is not adhered. A first opening part for leading partial acoustic wave from a front acoustic end hole (11) is formed at the inner peripheral surface side of the vibration plate. A second opening part (223) that is opened to the inner wall surface of the unit housing is formed at the outer peripheral surface side of the bearing ring of the vibration plate. The second opening part is acoustically connected with the rear side of the vibration plate via a pad (40). The low frequency acoustic wave from the front acoustic end hole is led to the rear side of the vibration plate via the groove having vested acoustic quality so to as make the front and rear pressures of the vibration plate be equivalent in the low frequency dominate.
Description
Technical field
The present invention relates to a kind of single directivity capacitor microphone unit and line formula microphone (ラ イ Application マ イ Network ロ ホ Application), further specifically, relate to a kind of technology that prevents the wind noise.
Background technology
In the microphone field, the wind noise mainly is to produce when the interference that produces air flows around the microphone.The frequency content of wind noise is the following low frequency of 500Hz roughly, and the wind noise of the large amplitude that 20Hz is following can not directly hear as sound, but can cause taking place the such sound of cavity sound and sound fracture, and cross modulation distortion.
Generally wait corresponding wind noise by noise control cover or fan housing, but according to its aeration and the screening effect difference of wind if mesh is overstocked, then can make the deterioration in characteristics of microphone.On the other hand, for deterioration in characteristics that does not make microphone and the screening effect raising that makes wind, the profile of fan housing must be very big.
As other countermeasure, the method that has following patent document 1-3 to be put down in writing: the rear side from anterior acoustics terminal to oscillating plate (with the face of the opposed side of fixed pole) is passed through low-frequency sound wave.In view of the above, in lower frequency region, before and after oscillating plate, do not produce pressure differential, so can lower wind noise and vibrating noise.
In the invention that patent documentation 1 (open S61-187189 number of the practical new case of Japan) is put down in writing, on oscillating plate support ring, oscillating plate and stripper loop, notch is set respectively, form access from the front face side of oscillating plate to the sound wave of rear side.
In the invention that patent documentation 2 (open 05-11696 number of the practical new case of Japan) is put down in writing, to be clipped between the radio reception face of supporting oscillating plate support ring of oscillating plate and unit housings at the woven wire that also has aeration on the face direction, and on the part of the periphery of fixed pole, notch is set, forms access from the front face side of oscillating plate to the sound wave of rear side.
In the invention that patent documentation 3 (Japan Patent open H09-84195 number) is put down in writing, at oscillating plate from being formed with on one's body and the very little opening of pressure usefulness of equal value by the heat of for example sparkover.
But, in the invention that patent documentation 1 is put down in writing, the notch of oscillating plate support ring is overlapped with the notch of stripper loop, if the rotation of the inner matter of unit housings, the position deviation of two notchs then, the access from the front face side of oscillating plate to the sound wave of rear side is cut off.
In the invention that patent documentation 2 is put down in writing, the woven wire that is configured between the radio reception face of oscillating plate support ring and unit housings works mainly as acoustic resistance, so be difficult to control the acoustics mass component.
In addition, the invention that patent documentation 3 is put down in writing does not have the situation of acoustics pipe etc. effective for the front face side at oscillating plate as the condenser-type microphones of studio, and when being used to adopt the line formula microphone (narrow directional microphone) of acoustics pipe, existence can not be controlled the problem of its acoustic mass.
Summary of the invention
Thereby problem of the present invention provides a kind of single directivity capacitor microphone unit, has in order to prevent the wind noise to help the acoustic mass (sound that low-frequency sound wave passed through from front face side to the rear side of oscillating plate
The Quality amount).
In order to solve above-mentioned problem, the invention provides a kind of single directivity capacitor microphone unit, comprise: the unit housings of round-ended cylinder shape is arranged, and at one end the face side possesses the end plate with anterior acoustics terminal hole integratedly, and the other end side is open; The oscillating plate assembly is opened in an end face side of oscillating plate support ring and to be provided with oscillating plate; The fixed pole assembly is at insulating base upper support fixed pole; Dispose the above-mentioned oscillating plate and the said fixing utmost point via the liner of electric insulating quality opposed to each other and constitute the acoustics electric converter, is that above-mentioned end plate side is accommodated in the said units housing with this acoustics electric converter with above-mentioned oscillating plate assembly, be provided with fixed mechanism in the other end of said units housing side by the above-mentioned acoustics electric converter of press fit, being characterized as of this single directivity capacitor microphone unit, in the other end of above-mentioned oscillating plate support ring side, be formed with and above-mentioned end plate between the groove with set acoustic mass of tubulose, specified location in the inner peripheral surface side of above-mentioned oscillating plate support ring, be formed with the 1st peristome that will be directed into from the part of the sound wave of above-mentioned anterior acoustics terminal hole in the above-mentioned groove, and specified location in the outer peripheral face side of above-mentioned oscillating plate support ring, be formed with the 2nd peristome to the internal face opening of above-mentioned unit housings, above-mentioned the 2nd peristome is connected with the rear side acoustics ground of above-mentioned oscillating plate via above-mentioned liner.
According to the present invention, the other end of oscillating plate support ring (face of oscillating plate opposition side) side be formed with and the end plate of unit housings between the groove with set acoustic mass of tubulose, be formed with at the specified location of the inner peripheral surface side of oscillating plate support ring the part from the sound wave of anterior acoustics terminal hole is directed into the 1st peristome in the groove, and be formed with the 2nd peristome to the internal face opening of unit housings at the specified location of the outer peripheral face side of oscillating plate support ring, the 2nd peristome is connected with the rear side acoustics ground of oscillating plate via liner, thereby be fed to the rear side of oscillating plate via groove from the sound wave of the lower frequency region of anterior acoustics terminal hole with set acoustic mass, therefore pressure equivalence before and after the oscillating plate can lower the wind noise effectively in lower frequency region.
According to optimal way of the present invention, form above-mentioned groove around full week of above-mentioned oscillating plate support ring, above-mentioned the 1st peristome and above-mentioned the 2nd peristome are configured on 180 ° of opposed positions.
Acoustic mass is decided by the width that is formed on the groove on the oscillating plate support ring, the degree of depth, length, be configured on 180 ° of opposed positions the acoustic mass balance of the slot part about can making by form in full week groove, the 1st peristome and the 2nd peristome around the oscillating plate support ring.
In the present invention, above-mentioned liner preferably adopts the plastic screen cloth that has aeration on the face direction, also can be formed with the notch that the rear side acoustics ground with above-mentioned the 2nd peristome and above-mentioned oscillating plate is connected on the above-mentioned liner.
Liner adopts the plastic screen cloth also have aeration on the face direction, thereby even if do not carry out contraposition with the 2nd peristome especially, also can make the rear side of the acoustic wave action of lower frequency region in oscillating plate.
In addition, also include a kind of line formula microphone of narrow directive property in the present invention, make up above-mentioned single directivity capacitor microphone unit and acoustics pipe and constitute.
In the situation of the line formula microphone (narrow directivity capacitor microphone) that adopts the acoustics pipe, anterior acoustics terminal to microphone unit applies the big acoustic impedance that the acoustics pipe is had, therefore, must be by coming acoustics ground to be connected the front and back of oscillating plate with the corresponding acoustic mass of this big acoustic impedance, according to the present invention, can utilize the width that is formed on the groove on the oscillating plate support ring, the degree of depth, length and the most suitably set acoustic mass.
Description of drawings
Fig. 1 is the profile of the single directivity capacitor microphone unit of expression embodiment of the present invention.
Fig. 2 is the decomposing section of Fig. 1.
Fig. 3 is the vertical view that expression is the oscillating plate support ring as the portion that wants of the present invention.
Embodiment
Then, according to Fig. 1 to Fig. 3, embodiments of the present invention are described, but the present invention is not limited thereto.Fig. 1 is the profile of the single directivity capacitor microphone unit (below, abbreviate " microphone unit " as) of expression embodiment of the present invention, and Fig. 2 is the decomposing section of Fig. 1, and Fig. 3 is the vertical view that the expression portion that wants of the present invention is the oscillating plate support ring.
With reference to Fig. 1, Fig. 2, this microphone unit has as basic formation: the liner 40 of unit housings 10, oscillating plate assembly 20, fixed pole assembly 30, electric insulating quality and circuit substrate 50.
Oscillating plate assembly 20 comprises oscillating plate 21 and oscillating plate support ring 22,21 of oscillating plates is located at an end face 22a side of oscillating plate support ring 22 with prescribed tension.Oscillating plate 21 can use the film of the synthetic resin that is formed with the metal evaporation film.In addition, oscillating plate support ring 22 is the metallic ring of aluminium etc. for example.
Fixed pole assembly 30 comprises fixed pole 31 and insulating base 32.Fixed pole 31 uses the metallic plate with a plurality of air vent holes 311, also can be provided with foil electret in its surface.Insulating base 32 is made of plastic disc, and the face by the one side supports fixed pole 31.
In order to make the rear side that acts on oscillating plate 21 from the sound wave of rear portion described later acoustics terminal hole 51 via the air vent hole 311 of fixed pole 31, on insulating base 32, run through being provided with acoustic duct hand-hole 321.In the bearing-surface side of insulating base 32, be formed with the back air chamber 322 that is communicated with acoustic duct hand-hole 321, in back air chamber 322, take in set sound-resistance material 323.
The gate pole of FET52 is electrically connected mechanism and is connected with fixed pole 31 via set, in the present embodiment, the gate pole of PET52 be provided in insulating base 32 middle body and with electrode terminal 55 contacts that electrically are connected via helical spring 54 and fixed pole 31.
Between oscillating plate 21 and fixed pole 31, dispose liner 40, make oscillating plate assembly 20 and 30 combinations of fixed pole assembly, thereby constitute the acoustics electric converter.
In practice, after taking in to unit housings 10, at the rear side configuration circuit substrate 50 of insulating base 32 and rivet the other end 10b of unit housings 10 with the order of oscillating plate assembly 20, liner 40 and fixed pole assembly 30.
So, the above-mentioned acoustics electric converter of assembling in unit housings 10, and with it by press fit, but also can replace riveting and embed locking ring in the other end 10b of unit housings 10 side.
In the present invention, in order to prevent the wind noise, have acoustic mass on oscillating plate support ring 22, this acoustic mass helps to make low-frequency sound wave to pass through to the back side from the front face side of oscillating plate 21.
Contrast is formed with groove 221 in the other end of oscillating plate support ring 22 22b side in the present invention with reference to Fig. 3.So the end plate 10a butt of the other end 22b of oscillating plate support ring 22 and unit housings 10 can form pipe by groove 221 between oscillating plate support ring 22 and end plate 10a.This pipe moves as the acoustic mass that the sound wave that can make lower frequency region passes through.
In the present embodiment, groove 221 formed around the full week of oscillating plate support ring 22, on the specified location of inner peripheral surface side of vibration support ring 22, is formed with the part from the sound wave of portion's acoustics terminal hole 11 is directed into the 1st peristome 222 in the groove 221.In addition, the specified location in the outer peripheral face side of oscillating plate support ring 22 is formed with towards the 2nd peristome 223 of the internal face opening of unit housings 10.
At this moment, in order to make the acoustic mass balance in the slot part of the left and right sides, and preferably the 1st peristome 222 and the 2nd peristome 223 are configured to 180 ° of opposed positions.In addition, liner 40 preferably uses the plastic screen material (for example, the polyester screen of plain weave) that also has aeration on the face direction.
In view of the above, the part of the low-frequency sound wave in the sound wave that is entered by anterior acoustics terminal hole 11 enters to the groove 221 with set acoustic mass from the 1st peristome 222, come out and arrive the rear side of oscillating plates 21 via the gap between oscillating plate support ring 22 and the unit housings 10 and liner 40 from the 2nd peristome 223, so in lower frequency region, make oscillating plate front and back pressure equivalence, can lower the wind noise effectively.
Above-mentioned acoustic mass can be utilized the width, the degree of depth, length etc. of the groove 221 that is formed on the oscillating plate support ring 22 and sets aptly.Therefore, microphone unit of the present invention is specially adapted to adopt the line formula microphone of the narrow directive property of acoustics pipe.
Promptly, during line formula microphone, anterior acoustics terminal to microphone unit applies the bigger acoustic impedance that the acoustics pipe is had, so must be by coming acoustics ground to be connected the front and back of oscillating plate with the corresponding acoustic mass of this bigger acoustic impedance, according to the present invention, as mentioned above, can the most suitably set the desired acoustic mass of microphone unit of line formula microphone according to the width of the groove 221 that on oscillating plate support ring 22, forms, the degree of depth, length etc.Thereby in the present invention, the microphone unit that makes up above-mentioned formation and acoustics pipe have also been comprised and the line formula microphone of the narrow directive property that constitutes.
In the above-described embodiment, round the groove 221 that the full week formation acoustic mass of oscillating plate support ring 22 is used, still also can be corresponding to concrete condition for for example about half cycle.In addition, as liner 40, also can adopt constitute by film of synthetic resin, be formed with the liner of notch that acoustics ground connects the rear side of the 2nd peristome 223 of sound wave outlet side and oscillating plate 21.
Claims (5)
1. single directivity capacitor microphone unit, comprise: the unit housings of round-ended cylinder shape is arranged, and at one end the face side possesses the end plate with anterior acoustics terminal hole integratedly, and the other end side is open; The oscillating plate assembly is opened in an end face side of oscillating plate support ring and to be provided with oscillating plate; The fixed pole assembly is at insulating base upper support fixed pole; Dispose the above-mentioned oscillating plate and the said fixing utmost point via the liner of electric insulating quality opposed to each other and constitute the acoustics electric converter, is that above-mentioned end plate side is accommodated in the said units housing with this acoustics electric converter with above-mentioned oscillating plate assembly, be provided with fixed mechanism in the other end of said units housing side by the above-mentioned acoustics electric converter of press fit
Being characterized as of this single directivity capacitor microphone unit,
In the other end of above-mentioned oscillating plate support ring side, be formed with and above-mentioned end plate between the groove with set acoustic mass of tubulose, specified location in the inner peripheral surface side of above-mentioned oscillating plate support ring, be formed with the 1st peristome that will be directed into from the part of the sound wave of above-mentioned anterior acoustics terminal hole in the above-mentioned groove, and specified location in the outer peripheral face side of above-mentioned oscillating plate support ring, be formed with the 2nd peristome to the internal face opening of above-mentioned unit housings, above-mentioned the 2nd peristome is connected with the rear side acoustics ground of above-mentioned oscillating plate via above-mentioned liner.
2. single directivity capacitor microphone unit as claimed in claim 1 is characterized in that, forms above-mentioned groove around full week of above-mentioned oscillating plate support ring, and above-mentioned the 1st peristome and above-mentioned the 2nd peristome are configured on 180 ° of opposed positions.
3. single directivity capacitor microphone unit as claimed in claim 1 or 2 is characterized in that, above-mentioned liner adopts the plastic screen cloth that also has aeration on the face direction.
4. single directivity capacitor microphone unit as claimed in claim 1 or 2 is characterized in that, is formed with the notch that the rear side acoustics ground with above-mentioned the 2nd peristome and above-mentioned oscillating plate is connected on the above-mentioned liner.
5. the line formula microphone of a narrow directive property, any described single directivity capacitor microphone unit of combination claim 1～4 and acoustics pipe and constitute.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008020241A JP5118987B2 (en) | 2008-01-31 | 2008-01-31 | Unidirectional condenser microphone unit and line microphone |
| JP2008020241 | 2008-01-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101500187A true CN101500187A (en) | 2009-08-05 |
Family
ID=40947020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009100099482A Pending CN101500187A (en) | 2008-01-31 | 2009-01-24 | Single directivity capacitor type microphone unit and linear microphone |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5118987B2 (en) |
| CN (1) | CN101500187A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102648640A (en) * | 2009-10-06 | 2012-08-22 | 星电株式会社 | Unidirectional microphone |
| CN104424940A (en) * | 2013-08-19 | 2015-03-18 | 安电株式会社 | Piezoelectric buzzer |
| CN106898343A (en) * | 2017-01-23 | 2017-06-27 | 南京大学 | The device that can realize low frequency directivity manipulation for propagating 0 rank plane sound wave |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5620326B2 (en) * | 2011-04-14 | 2014-11-05 | 株式会社オーディオテクニカ | Condenser microphone unit and condenser microphone |
| CN103347224B (en) * | 2013-06-05 | 2016-02-03 | 歌尔声学股份有限公司 | Reduce the acoustical cavity that microphone pickup wind is made an uproar |
| KR101439047B1 (en) | 2013-07-30 | 2014-09-05 | 현대자동차주식회사 | Microphone for a vehicle |
| CN108305610B (en) * | 2018-03-23 | 2024-02-20 | 苏州登堡电子科技有限公司 | Split wall vibration sound transmission device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5677200U (en) * | 1979-11-14 | 1981-06-23 | ||
| JPH0646160Y2 (en) * | 1985-05-13 | 1994-11-24 | 株式会社オ−デイオテクニカ | Condenser microphone |
| JPS62234000A (en) * | 1986-03-31 | 1987-10-14 | ル−ドルフ・ゲ−リケ | Large area capacitor loudspeaker |
| JP2579190Y2 (en) * | 1991-07-29 | 1998-08-20 | 株式会社オーディオテクニカ | Condenser microphone |
| JP3425016B2 (en) * | 1995-09-08 | 2003-07-07 | 株式会社オーディオテクニカ | Variable directional condenser microphone |
| JP3980193B2 (en) * | 1998-09-04 | 2007-09-26 | 株式会社オーディオテクニカ | Narrow directivity condenser microphone |
| JP4476059B2 (en) * | 2004-07-20 | 2010-06-09 | シチズン電子株式会社 | Electret condenser microphone |
-
2008
- 2008-01-31 JP JP2008020241A patent/JP5118987B2/en not_active Expired - Fee Related
-
2009
- 2009-01-24 CN CNA2009100099482A patent/CN101500187A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102648640A (en) * | 2009-10-06 | 2012-08-22 | 星电株式会社 | Unidirectional microphone |
| US8724839B2 (en) | 2009-10-06 | 2014-05-13 | Hosiden Corporation | Unidirectional microphone |
| CN102648640B (en) * | 2009-10-06 | 2015-06-10 | 星电株式会社 | Unidirectional microphone |
| CN104424940A (en) * | 2013-08-19 | 2015-03-18 | 安电株式会社 | Piezoelectric buzzer |
| CN104424940B (en) * | 2013-08-19 | 2019-08-09 | 安电株式会社 | Piezo buzzer |
| CN106898343A (en) * | 2017-01-23 | 2017-06-27 | 南京大学 | The device that can realize low frequency directivity manipulation for propagating 0 rank plane sound wave |
| CN106898343B (en) * | 2017-01-23 | 2020-12-15 | 南京大学 | Device capable of realizing low-frequency directional control for transmitting 0-order plane sound wave |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5118987B2 (en) | 2013-01-16 |
| JP2009182758A (en) | 2009-08-13 |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090805 |