CN102325293B - Electret polarization device and method for polarization by adopting same - Google Patents
Electret polarization device and method for polarization by adopting same Download PDFInfo
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- CN102325293B CN102325293B CN201110118407.0A CN201110118407A CN102325293B CN 102325293 B CN102325293 B CN 102325293B CN 201110118407 A CN201110118407 A CN 201110118407A CN 102325293 B CN102325293 B CN 102325293B
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- 230000010287 polarization Effects 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title abstract description 12
- 238000010438 heat treatment Methods 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims 1
- 239000002184 metal Substances 0.000 abstract 5
- 238000007747 plating Methods 0.000 description 6
- 230000005516 deep trap Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000004577 thatch Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000004907 flux Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
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Abstract
The invention is suitable to the technical field of polarization and provides an electret polarization device and a method for polarization by adopting the same. The polarization device comprises a needle electrode, a direct-current high-voltage power source and a metal base which are sequentially connected in series, wherein more than two coils are arranged between the needle electrode and the metal base, and the more than two coils are same in size and parallel to the metal base, have sequentially increasing energizing currents and are coaxially arranged at intervals. In the invention, by arranging more than two coils, which are same in size and parallel to the metal base, have sequentially increasing energizing currents and are coaxially arranged at intervals, between the needle electrode and the metal base, charges can be furled and concentrated into a small range, the quantity of electric charges in unit area on the electret is increased, and more charges can be captured by a deep well.
Description
Technical field
The invention belongs to Polarization technique field, a kind of method that relates in particular to polarization device of electret and adopt this polarization device to polarize.
Background technology
Along with the develop rapidly of electronic industry, the demand of electret capcitor microphone is increasing, function also improving constantly, perfect.In the production process of electret capcitor microphone, the polarization process of electret is particularly crucial.
At present, the polarization device of common electret as shown in Figure 1, comprises the metab 103, DC high-voltage power supply 104 and the needle electrode 101 that are connected in series successively.When polarization, having the electret 102 of film body to be placed on metab 103 plating to be polarized polarizes, needle electrode 101 is DC high-voltage power supply 104 times, can produce the electret 102 that electron beam directive is to be polarized, but due to the active force in the charging region of electron beam directive electret 102 uncertain factor on controlling, charge ratio disperses, cannot by electric charge a large amount of focus on a fixing region, can not effectively improve the quantity of electric charge on electret 102.
In sum, the polarization device of common electret cannot by electric charge a large amount of focus on a fixing region, can not effectively improve the quantity of electric charge in electret 102 unit ares of polarization.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of polarization device of electret, be intended to solve common electret polarization device cannot by electric charge a large amount of focus on a fixing region, can not effectively improve the problem of the quantity of electric charge in the electret unit are of polarization.
The embodiment of the present invention is to realize like this, a kind of polarization device of electret, comprise the needle electrode, DC high-voltage power supply and the metab that are connected in series successively, between described needle electrode and metab, be equipped with plural measure-alike, electrical current increases progressively successively from needle electrode to metab direction, parallel with metab, coaxial and interval row puts coil.
The embodiment of the present invention also provides a kind of method that adopts above-mentioned polarization device to polarize, and comprises the following steps:
Open DC high-voltage power supply;
Open DC power supply, the supply power voltage increasing progressively is successively provided to the coil being equipped with between needle electrode and metab;
Electret to be polarized is placed on metab, and has one of film body to polarize facing to coil direction plating on electret.
The embodiment of the present invention compared with prior art, beneficial effect is: by being equipped with plural measure-alike, electrical current increases progressively successively, parallel with metab, coaxial and interval row puts coil between needle electrode and metab, can draw electric charge in, in charge concentration to little scope, improve the quantity of electric charge in electret unit are, and can make deep trap catch more electric charge.
Accompanying drawing explanation
Fig. 1 is the structural representation of the polarization device of electret common in prior art;
Fig. 2 is the structural representation of the polarization device of the electret that provides of the embodiment of the present invention;
Fig. 3 is the flow chart of the method that polarizes of this polarization device of employing that the embodiment of the present invention provides;
Fig. 4 is electronics schematic diagram for the helical movement;
Fig. 5 is the schematic diagram that electronics is done varying pitch, the screw of change radius.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The embodiment that the embodiment of the present invention provides is as follows:
A kind of polarization device of electret, comprise: the needle electrode being connected in series successively, DC high-voltage power supply and metab, be equipped with plural measure-alike, electrical current increases progressively successively, parallel with metab, coaxial and interval row puts coil between described needle electrode and metab.
The method that above-mentioned polarization device polarizes, comprises the following steps:
Open DC high-voltage power supply;
Open DC power supply, the supply power voltage increasing progressively is successively provided to the coil being equipped with between needle electrode and metab;
Electret to be polarized is placed on metab, and has one of film body to polarize facing to coil direction plating on electret.
Below in conjunction with specific embodiment, realization of the present invention is described in detail:
Refer to Fig. 2, the embodiment of the present invention provides a kind of polarization device of electret, comprise: the needle electrode 21 being connected in series successively, DC high-voltage power supply 24 and metab 23, be equipped with plural measure-alike, electrical current increases progressively successively, parallel, coaxial with metab 23 and interval row puts coil 25 between described needle electrode 21 and metab 23.
By being equipped with plural measure-alike, electrical current increases progressively successively, parallel, coaxial with metab 23 and interval row puts coil 24 between needle electrode 21 and metab 23, can draw electric charge in, in charge concentration to little scope, improve the quantity of electric charge in electret 22 unit ares, and can make deep trap catch more electric charge.
In embodiments of the present invention, this polarization device also comprises:
The DC power supply 28 being connected with coil 25.
In embodiments of the present invention, the angle that is on-right angle between needle electrode 21 and coil 25.
In embodiments of the present invention, polarization device also comprises:
Be placed in the heating unit of metab 23 peripheries.
By heating unit, the electret wait polarizing 22 is being placed in while polarizing on metab 23, polarization charging effect can be better.
Wherein, heating unit specifically can be high-temperature pipe, and when electret 22 being placed in while polarizing on metab 23, the temperature of high-temperature pipe can be set to 150 ℃-190 ℃.After electret 22 polarization, the complete electret 22 of polarization can be placed in to room temperature borehole cooling and recover.
On electret 22 to be polarized, plating has film body, and film body specifically can adopt the composite membrane of fep film, PTFE film or FEP and PTFE.Preferably adopt PTFE film, while at high temperature polarizing, the stability of its electric charge is better.
In embodiments of the present invention, between needle electrode 21 and DC high-voltage power supply 24, be also connected in series with galvanometer 26.
In embodiments of the present invention, between can be arranged on-10KV of the voltage of DC high-voltage power supply 24～-20KV, preferably be set to-16KV of the voltage of DC high-voltage power supply 24, the quantity of electric charge that corona discharge can be produced maximizes, and the useful life of needle electrode is relatively long.In embodiments of the present invention, the negative pole of DC high-voltage power supply 24 is connected with galvanometer, and the positive pole of DC high-voltage power supply 24 is connected with metab, and the plus earth of DC high-voltage power supply 24.
In embodiments of the present invention, the number of turn of coil 25 is more than 50 circles.The diameter of coil 25 is between 10mm-20mm, and preferably diameter is 14mm.Electrical current in coil 25 is at 10A-50A.
In embodiments of the present invention, the electrical current size that is equipped with 251,252,253,254 and 255, five coils 251,252,253,254 of five coils and 255 between needle electrode 21 and metab 23 is followed successively by 10A, 20A, 30A, 40A, 50A.
In embodiments of the present invention, the spacing between adjacent two coils equates.
In embodiments of the present invention, the distance between adjacent two coils 25 is 30mm-100mm.Preferred distance is 50mm, the magnetic flux density of stack between adjacent windings 25 can be dropped to minimum.
In embodiments of the present invention, apart from the distance between the nearest coil of electret 22 upper surfaces and electret 22 upper surfaces, be 2mm-5mm.
Refer to Fig. 3, the embodiment of the present invention also provides a kind of method that adopts above-mentioned polarization device to polarize, and comprises the following steps:
In step S301, open DC high-voltage power supply 24.
In embodiments of the present invention, between can be arranged on-10KV of the voltage of DC high-voltage power supply 24～-20KV, preferably be set to-16KV of the voltage of DC high-voltage power supply 24, the quantity of electric charge that corona discharge can be produced maximizes, and the useful life of needle electrode is relatively long.
In step S302, open DC power supply 28, the supply power voltage increasing progressively is successively provided to the coil 25 being equipped with between needle electrode 21 and metab 23.
In embodiments of the present invention, five coils 251,252,253,254 and 255 that are equipped with between needle electrode 21 and metab 23, by DC power supply 28 is set, regulates the supply power voltage increasing progressively successively to five coils 251,252,253,254 and 255 is provided, thereby can make electrical current I1, I2, I3, I4, the I5 of coil 251,252,253,254 and 255 be the trend increasing progressively successively.The value that can control electrical current I1, I2, I3, I4, I5 is respectively 10A, 20A, 30A, 40A, 50A.The quantity of coil 25 can be set as required certainly in concrete application, and the electrical current on coil 25 also can arrange as required, as long as the trend that maintenance increases progressively.In this cited parameter, be not limited to the present invention.
S303: electret to be polarized 22 is placed on metab 23, and has one of film body to polarize facing to coil direction plating on electret 22.
In embodiments of the present invention, the time of polarization can be arranged on 0.1 second-1 second.Be preferably 0.5 second.The stability that can make electric charge is to better, and efficiency is higher.Certainly, in concrete application, can be set as required the polarization time, at this, be not limited to the present invention.
In embodiments of the present invention, further comprising the steps of before step S301:
Open heating unit.
By heating unit, the electret wait polarizing 22 is being placed in while polarizing on metab 23, polarization charging effect can be better.
Wherein, heating unit specifically can be high-temperature pipe, and when electret 22 being placed in while polarizing on metab 23, the temperature of high-temperature pipe can be set to 150 ℃-190 ℃.After electret 22 polarization, the complete electret 22 of polarization can be placed in to room temperature borehole cooling and recover.
As a preferred version, the method that adopts above-mentioned polarization device to polarize, comprises the following steps:
Open heating unit, temperature is risen to 190 ℃;
DC high-voltage power supply 24 is opened, voltage is adjusted to-16KV;
Open DC power supply 28, the supply power voltage increasing progressively is successively provided to five coils 25 that are equipped with between needle electrode 21 and metab 23, so that electrical current I1, I2, I3, I4, the I5 of coil 251,252,253,254 and 255 are respectively 10A, 20A, 30A, 40A, 50A;
Electret to be polarized 22 is placed on metab 23, and has one of film body to polarize facing to coil direction plating on electret 22;
The electret polarizing is returned to room temperature.
In an embodiment of the present invention, the electret polarizing can be placed under dustfree environment and return to room temperature.
Refer to Fig. 4 and Fig. 5, the polarization principles of the embodiment of the present invention be described as follows:
Under the acting in conjunction in electricity, magnetic field, electronics is accelerated under electric field action, and can have certain speed v, and the electronics of this Tapes electricity is incident in uniform magnetic field B with θ angle, and v is decomposed into: the component v ∥=vCos θ that is parallel to B; Component v ⊥=vSin θ perpendicular to B; Perpendicular to the component v ⊥ of B, the size of Yi speed change degree not, only changes the direction of speed, therefore electronics should be made uniform circular motion in the plane perpendicular to magnetic field, but owing to being parallel to the effect of the component v ∥ of B, electronics is Yi speed change degree again, thereby electronics can be done helical curve motion.
From formula, radius R=mv ⊥/qB of electron helical curvilinear motion, pitch h=v ∥ 2 π m/qB, when B increases, radius R is little all can diminish with pitch h.Therefore,, along with the increase of B, the radius R of helical curve and pitch h reduce in the direction increasing along B, refer to Fig. 5.
With above-mentioned measure-alike circular electric current coil 251,252,253,254,255, along direction arranged in co-axial alignment from top to bottom, the electric current I 1, I2, I3, I4, the I5 that wherein flow through progressively increase, and will produce the magnetic field progressively increasing as shown in Figure 5.If there is the electron emission of negative high voltage at the upside of coil 251, the electronics of Tapes electricity is incident in uniform magnetic field B with θ angle, and along with the increase of B, electronics is made varying pitch, become radius screw.The long-range navigation thatch power being subject to by the electron institute of the known Tapes electricity of formula is: Fm=qv * B, this is to obtaining more well depth, Tapes in the darker film body of charge injection can have been carried out to assurance.The high energy electron producing on needle electrode is subject to the effect of long-range navigation thatch power, and speed is accelerated, therefore can be by the darker injection film body of electric charge, and can draw electric charge in, in charge concentration to little scope, improve the quantity of electric charge in electret unit are, and can make deep trap catch more electric charge.
The polarization device of electret of the present invention and the method that adopts this polarization device to polarize, by being equipped with plural measure-alike, electrical current increases progressively successively, parallel, coaxial with metab 23 and interval row puts coil 24 between needle electrode 21 and metab 23, can draw electric charge in, in charge concentration to little scope, improve the quantity of electric charge in electret 22 unit ares, and can make deep trap catch more electric charge.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. the polarization device of an electret, comprise: the needle electrode being connected in series successively (21), DC high-voltage power supply (24) and metab (23), it is characterized in that, between described needle electrode (21) and metab (23), be equipped with plural measure-alike, electrical current increases progressively successively from needle electrode (21) to metab (23) direction, parallel, coaxial with metab (23) and interval row puts coil (25).
2. polarization device as claimed in claim 1, is characterized in that, described polarization device also comprises:
The DC power supply (28) being connected with described coil (25).
3. polarization device as claimed in claim 2, is characterized in that, is the angle of on-right angle between described needle electrode (21) and coil (25).
4. polarization device as claimed any one in claims 1 to 3, is characterized in that, described polarization device also comprises:
Be placed in the peripheral heating unit of described metab (23).
5. polarization device as claimed in claim 4, is characterized in that, described heating unit is specially high-temperature pipe.
6. polarization device as claimed in claim 4, is characterized in that, between described needle electrode (21) and described DC high-voltage power supply (24), is also connected in series with galvanometer (26).
7. polarization device as claimed in claim 1, is characterized in that, the number of turn of described coil (25) is more than 50 circles.
8. polarization device as claimed in claim 1, is characterized in that, is equipped with the coil (25) that five electrical current sizes are followed successively by 10A, 20A, 30A, 40A and 50A between described needle electrode (21) and metab (23).
9. polarization device as claimed in claim 1, is characterized in that, the spacing between adjacent two coils equates.
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| CN102738384B (en) * | 2012-06-21 | 2015-07-08 | 上海大宫新材料有限公司 | Polymer dielectric electrostatic polarization device and electrostatic polarization method thereof |
| DE102012221833A1 (en) * | 2012-11-29 | 2014-06-05 | Robert Bosch Gmbh | Transducer with at least one electrode of a first type, an electrode of a second type and at least one ferroelectret |
| CN103327438B (en) * | 2013-06-06 | 2016-03-02 | 潍坊华瑞电子科技有限公司 | Vibrating diaphragm polarization device and automatically vibrating diaphragm polarization assembly machine |
| CN103347244B (en) * | 2013-06-25 | 2016-05-25 | 中山市天键电声有限公司 | A kind of electret automatic instantaneous polarization machine |
| CN105036065B (en) * | 2015-07-13 | 2016-08-17 | 北京理工大学 | A kind of electret polarization device based on ray and polarization method thereof |
| CN113576574A (en) * | 2021-07-28 | 2021-11-02 | 中国科学院深圳先进技术研究院 | Preparation method and device of nerve cannula, electronic equipment and storage medium |
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| CN202050540U (en) * | 2011-05-09 | 2011-11-23 | 东莞勤增实业有限公司 | Polarization device of electret |
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| KR101577851B1 (en) * | 2009-02-20 | 2015-12-15 | 아사히 가라스 가부시키가이샤 | Process for manufacturing electret, and electrostatic induction-type conversion element |
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| CN101071683A (en) * | 2007-03-20 | 2007-11-14 | 浙江科技学院 | Electret polarizing method |
| CN202050540U (en) * | 2011-05-09 | 2011-11-23 | 东莞勤增实业有限公司 | Polarization device of electret |
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