CN85100574A - The manufacture method of transducer electret back pole - Google Patents
The manufacture method of transducer electret back pole Download PDFInfo
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- CN85100574A CN85100574A CN 85100574 CN85100574A CN85100574A CN 85100574 A CN85100574 A CN 85100574A CN 85100574 CN85100574 CN 85100574 CN 85100574 A CN85100574 A CN 85100574A CN 85100574 A CN85100574 A CN 85100574A
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- pdcpx
- backplane
- film
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Abstract
The manufacture method of transducer electret back pole belongs to the electret transducer technical field, adopting poly-dichloro is the former material of electret to penylene dimethyl (PDCPX), method with gas-phase polymerization, on transducer backplane matrix, or on for the aluminium sheet of punching out backplane part, condense the transparent bright and clean PDCPX film of the about 20 μ m of a bed thickness.It gets rid of prior art in the difficulty of making the high-fidelity transducer electret back pole, can make the electret back of complex geometry, and the multi-needle corona polarization method with inhibition polarization edge clamps is provided.
Description
The invention belongs to the electret transducer technical field.Be applicable to the electret back of making high fidelity microphone, earphone and other capacitance-type transducers.
In order to make electret transducer that the performance of long life and high-fidelity be arranged, electret film and vibrating diaphragm must be separated.The US404091 patent sticked to the method for perfluoroethylene-propylene (FEP) film with heating on the backplane in 1977, form the FEP electret back after polarizing, and vibrating diaphragm had the polyester film of metal to serve as by the one side steaming.Yet this method is difficult to make the electret back of the high-fidelity transducer with complex geometric shapes.
Domestic employing FEP sintering backplane method also has following shortcoming except that above-mentioned defective is arranged: the 1. FEP backplane air spots of sintering needs to increase grinding step.2. there is irregular dwindling at backplane hole inwall and edge, and influence the consistency of transducer performance.3. can discharge fluoro-gas during sintering FEP, harmful health.
The labor woods Rob Thomas people such as (Nowlin Thomas) of U.S.'s carbide company in 1980 has invented poly-dichloro to penylene dimethyl (PDCPX) electret (Canadian Patent CA.1146908), it has higher working temperature than FEP electret, but fails to be used for electret back.
Method of the present invention can overcome above-mentioned shortcoming, and a kind of method of practicality is provided for the making of the electret back of high-fidelity microphone and other transducers.
The main points of this method are to utilize the characteristics of PDCPX gas-phase polymerization, at the metal backplane piece surface of the high-fidelity transducer of any geometry and hole wall cohesion layer of transparent, the uniform PDCPX film of thickness, make PDCPX backplane part.In order to adapt to requirement of mass production such as recorder and transmitter, the punching out backplane is to adopt.The PDCPX aluminium sheet that this method can provide the punching out backplane to use, since to surface of aluminum plate through pickling processes, PDCPX is to the dry adhesive strength of aluminium sheet, reach 2 grades of GB1720-79 paint film adhesion strength criterions, the PDCPX aluminium sheet is washed into PDCPX backplane part, promptly can be made into the PDCPX electret back with the corona charging method.
This method had following advantage than former method:
1, PDCPX can condense the PDCPX film that all even And of a layer thickness can control selectively on the metal backplane matrix of Any shape, and its thickness can be selected between 5～40 μ m.Therefore the overall dimension of PDCPX backplane is only than big two film thicknesses of metal backplane matrix, and its aperture then dwindles two film thickness (see figure 1)s.As long as the designer considers the tolerance fit of this variation, the electret transducer that just can design and manufacture high-fidelity comes.
2, the overall process of the PDCPX electret back manufacturing of punching out can not produce the gas of harmful human body.
3, record the surface potential of PDCPX electret 10 with l
5Be 94.5 ℃ from 500 volts of working temperatures that decay to 200 volts in hour (≈ 11 years), high approximately 20 ℃ than FEP electret.
4, this method has adopted the corona polarizing device And of the corona pin electrode battle array of strength of discharges such as having of uniqueness to adopt the sample device anchor clamps that suppress the polarization edge effect, to the charging of PDCPX backplane, the surface potential of each backplane electret is (seeing Table 1) comparatively evenly with this complete equipment.
Fig. 1 is the cartridge schematic diagram of the high-fidelity transducer of PDCPX electret back.The 1st, the polyester vibrating diaphragm, the 2nd, metal level, the 3rd, the backplane metal device, 6 is the PDCPX film.
Fig. 2 is the relative position schematic diagram of punching out backplane transducer PDCPX electret back (9) (12) and polyester vibrating diaphragm (7) (8).
Fig. 3 represents that high-fidelity transducer backplane metallic matrix (3) condenses the PDCPX film in the DCPX monomer atmosphere (13) in the PDCPX film-forming machine.
Fig. 4 represents with the special corona polarizing equipment of this method the PDCPX film to be charged.(14) be a pin electrode in the equal strength discharge corona pin electrode battle array.(16) be to suppress a kind of in the sample clamp of polarization edge effect.
Fig. 5 represents that the aluminium sheet (9) that pickling processes is crossed condenses the PDCPX film in DCPX monomer atmosphere (13), make the PDCPX aluminium sheet as Fig. 6.
Fig. 7 represents the PDCPX backplane part with the punching out of PDCPX aluminium sheet.
The implementation process of this method is as follows:
1, the dimethylated structural formula of polyhenylene is
A hydrogen atom on its aryl nucleus is substituted by a chlorine atom, form to gather-chlorine is to penylene dimethyl (PCPX), and its structural formula is
If two hydrogen atoms on the aryl nucleus are substituted by two chlorine atoms, just form poly-dichloro to penylene dimethyl (PDCPX), its structural formula is
It is the former material of electret that this method adopts PDCPX.
2, PDCPX vacuum gas phase coacervation process carries out in the PCPX II film-forming machine that the Jiangsu chemical industry is developed.This machine is made up of vaporizer, cracking tube, film forming room, vacuum pump etc., the tetrachloro-p-phenylene supports diformazan basic ring disome powder and gasifies in vaporizer, enter immediately in the lower slightly cracking tube of air pressure, in about 650 ℃, be cracked into dichloro, enter about 10 then penylene dimethyl activated monomer gas
-2The vacuum film formation of mmHg is indoor, and at the PDCPX film of surface of solids cohesion last layer thickness homogeneous transparent, film growth thickness is monitored by calibrator under 25-130 ℃ temperature.Its process reaction formula is as follows:
The tetrachloro-p-phenylene supports the dimethyl tetrachloro-p-phenylene and supports the poly-dichloro of dimethyl to the penylene dimethyl
Ring disome (solid) ring disome (gas) activated monomer gas (PDCPX)
3, aluminium sheet is cleaned with acid, after the clean And drying of distillation washing, with isometric wide aluminium sheet, two two-phases are folded, and the edge places the film-forming machine film forming after sealing with adhesive tape.After the film forming, cut and seal adhesive tape, just can be made into the PDCPX aluminium sheet (see figure 6) that one side deposits the PDCPX film.
4, the punching out of PDCPX aluminium sheet is become PDCPX backplane part (see figure 7).
5, the PDCPX film is condensed upon the metal base surface of the high-fidelity backplane part of machine-shaping in advance, make the PDCPX backplane part of high-fidelity.
6, two kinds of above-mentioned PDCPX backplane parts are placed on the sample clamp that suppresses the polarization edge effect, the PDCPX film on the backplane are charged with the corona polarizing device of the pin electrode battle array (each pin corona intensity basically identical) of many corona pins compositions.Make the PDCPX electret back of surface potential unanimity.
7, backplane electret surface current potential is measured with the special surface potential measurement instrument of this method.
8, PDCPX backplane and fet gate adopt the Elastic Contact electrical coupling.
9, electret stability is had specific (special) requirements, the backplane after the charging can be put into the PDCPX film that the PDCPX film-forming machine covers the about 5 μ m of a bed thickness once more.
Embodiment: the PDCPX backplane part that has 8 holes that is washed into φ 8 with the PDCPX aluminium sheet of 0.6mm, polarizer apparatus with this method polarized 10 minutes, wore out 10 minutes in 94 ℃, high-temperature test is 240 minutes in 70 ℃, tests to record Potential distribution such as table 1 in back 9 hours:
Current potential is negative in the table 1(table)
Claims (4)
1, a kind of manufacture method of transducer electret back pole, it is characterized in that and in the transducer metal backplane surface of any geometry and hole, to condense layer of transparent, the uniform PDCPX film of thickness, make PDCPX backplane part, or unlikelyly peel off at one side cohesion one deck of making the aluminium sheet that overpickling handles, thickness is even, bright and clean smooth PDCPX film, with punch die the PDCPX aluminium sheet is washed into PDCPX backplane part, with corona polarizing equipment the PDCPX film on the backplane part is charged, make the PDCPX electret back with equal strength discharge multistylus electrode.
2,, it is characterized in that controlling the polymerization temperature of PDCPX between 25～130 ℃ according to the described method of claim 1.
3, according to claim 1 or 2 described methods, it is characterized in that aluminium sheet has been carried out the pickled surface processing, clean with distilled water flushing again, after the drying, place PDCPX film-forming machine film forming.
4, according to claim 1 or 2 described methods, it is characterized in that adopting the corona polarizing device of the pin electrode of many corona pins compositions, to PDCPX backplane alternating current, each pin corona intensity basically identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85100574 CN85100574A (en) | 1985-11-27 | 1985-11-27 | The manufacture method of transducer electret back pole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85100574 CN85100574A (en) | 1985-11-27 | 1985-11-27 | The manufacture method of transducer electret back pole |
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| CN85100574A true CN85100574A (en) | 1987-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 85100574 Pending CN85100574A (en) | 1985-11-27 | 1985-11-27 | The manufacture method of transducer electret back pole |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101426165B (en) * | 2007-10-29 | 2013-03-20 | 财团法人工业技术研究院 | Single body construction for loudspeaker |
-
1985
- 1985-11-27 CN CN 85100574 patent/CN85100574A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101426165B (en) * | 2007-10-29 | 2013-03-20 | 财团法人工业技术研究院 | Single body construction for loudspeaker |
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