CN1108085C - Ring conductive diaphragm, and injection moulded and printed electrode constituted capacitor loudspeaker - Google Patents
Ring conductive diaphragm, and injection moulded and printed electrode constituted capacitor loudspeaker Download PDFInfo
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- CN1108085C CN1108085C CN99116361A CN99116361A CN1108085C CN 1108085 C CN1108085 C CN 1108085C CN 99116361 A CN99116361 A CN 99116361A CN 99116361 A CN99116361 A CN 99116361A CN 1108085 C CN1108085 C CN 1108085C
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Abstract
The present invention relates to a capacitive loudspeaker which is composed of a loop conductive vibrating diaphragm, an injection molding electrode and a printing electrode. The loudspeaker comprises an electroacoustic transducer and a driver, wherein the electroacoustic transducer is composed of a vibrating diaphragm, a fixed electrode and a conductive electrode. The present invention is characterized in that the vibrating diaphragm substrate is made of polymer insulating film materials, and conductive rings are attached to both surfaces of the substrate except for the strip-shaped central areas. The present invention simplifies the structure of traditional loudspeakers, lowers technical difficulty and cost, and improves electroacoustic performance and safety thereof.
Description
Technical field
The present invention relates to the electroacoustic transducer field, be specifically related to the condenser loudspeaker of round conductive diaphragm and injection mo(u)lding, printing electroplax formation.
Background technology
Condenser loudspeaker has a lot of performance index more superior than present widely used dynamic speaker; Less as distortion, frequency band broad, advantage such as dipole formula (two-sided sounding unanimity), far field are effective, and good, the subjective sense of hearing of transient response is splendid, nonmagnetic, volume is thin.But what condenser loudspeaker was less accepts production for business circles.The less main cause of accepting to produce for business circles comprises: the structure more complicated, and technology difficulty is bigger, and cost is higher.Simultaneously, what condenser loudspeaker was also less is accepted by the user, and a main cause is because of manufacturing enterprise's cost height, thereby fetch long price causes; Another main cause is that condenser loudspeaker is exported smooth inadequately when bearing bigger electrical power, discharge breakdown can occur when particularly condenser loudspeaker being born to exceed tolerance power, so that cause the phenomenon of loud speaker permanent damage when user misoperation.
The technology of the condenser loudspeaker before the present invention and technical difficulty and expensively mainly show two aspects:
A, vibrating diaphragm:
In the condenser loudspeaker technical field before the present invention, vibrating diaphragm is fixing around the retainer plate, and during its vibration, it is well-known that vibrating diaphragm is hemispherical form (see figure 9).Hemispherical form illustrates central amplitude greater than peripheral amplitude, because of rather than the fixing piston vibration in desirable edge.Particularly when the condenser loudspeaker area was big, this shortcoming was just more outstanding, was easy to produce as the akin displacement distortion of the tapered vibrating diaphragm of dynamic speaker.The frequency response curve of its output is also uneven.In addition, the top of " hemisphere " (central area of vibrating diaphragm) near fixed electrode, makes input power bigger when user misoperation, causes the air dielectric between high-voltage breakdown fixed electrode and the movable electrode (vibrating diaphragm), will produce corona (electrion).Unusual discharging sound (the hot-air expansion sound that corona causes) can take place and heavily then puncture, smashes vibrating diaphragm in light then loud speaker, cause the damage of going into property forever of loud speaker, even can produce the electrion pulse, and other wired electrical equipment or radio facility are produced interference, cause accident.
The B fixed electrode:
The fixed electrode of conventional condenser loud speaker divides two major types:
The one, all-metal plate perforated electrodes, the metal sheet (general thickness is 0.5-1.5mm) that is about to punch forming is made through cold punching hole repeatedly.The all-metal fixed electrode generally adopts aluminium sheet (as Britain QUAD company portioned product) or copper coin (as Japanese Sony Corporation product, China is along the portioned product of safe company) and iron plate metal materials such as (as the portioned products of U.S. MARTINLOGAN company).The technology difficulty of all-metal plate fixed electrode is: the metallic plate internal stress deformation that causes when (1) must proofread and correct cold working, to guarantee its flatness; (2) must prevent that vibrating diaphragm from leaning on closely and the generation high-voltage breakdown with fixed electrode in when vibration.Thereby must make withstand voltage insulation processing to fixed electrode, make its withstand voltage up to 5000 volts about.Problem is that most insulating varnish all have surface tension, and make the edge in hole on the metallic plate reach withstand voltage about 5000 volts is difficulty very, also is inevitably expensive.Another approach of dealing with problems is to precipitate macromolecule, high insulating material on the metal fixed electrode, has increased technology difficulty and processing cost thereof thus.
The 2nd, insulation board applies the copper perforated electrodes.Insulation copper clad plate perforation fixed electrode is the copper sheet of precoating on glass fibre or epoxy resin board surface, mode with boring one by one obtains (this kind process program is that German ROLFRENNWALD proposed in its " full range capacitor formula loud speaker " paper in 1963, and Chinese Wuhan also is to adopt this kind scheme along the portioned product of safe Electronics Co., Ltd.) then.Repeatedly the punch defective of fixed electrode of this deposited copper insulation board is: repeatedly punch (1) must accurate plant equipment, and the complexity and the processing cost of technology are higher; (2) glass mat that approaches or the mechanical strength of resin plate often are lower than the metallic plate of same thickness, thereby must increase thickness to guarantee necessary mechanical strength.Thus, cost just more becomes higher, and is much also more expensive than the all-metal fixed electrode sometimes.
Summary of the invention
The objective of the invention is to simplify the structure of condenser loudspeaker in the background technology, reduce technology difficulty, reduce production costs, overcome condenser loudspeaker and go to wear phenomenon in the unevenness and the discharge of bearing more high-power time output, a kind of round conductive diaphragm and injection mo(u)lding are proposed, the condenser loudspeaker that printed electrode constitutes.
At the foregoing invention purpose, the present invention adopts following technical scheme: a kind of round conductive diaphragm and injection mo(u)lding, the condenser loudspeaker that printed electrode constitutes, the driver that comprises electroacoustic transducer and the work of assurance electroacoustic transducer, wherein, electroacoustic transducer is made up of vibrating diaphragm, fixed electrode and conductive electrode, and its special character is described vibrating diaphragm matrix adopting macromolecule insulating film material, and this vibrating diaphragm is matrix double-faced to be attached with conductive ring except that the bar shaped central area.
In such scheme, described fixed electrode is to be printed on the netted electric conducting material that has sound penetrating hole and have protruding flange plastic plate A face, described conductive electrode is the electric conducting material that is printed on the protruding flange of above-mentioned plastic plate B face, and the protruding flange of two above-mentioned plastic plates closely contacts in the face of the two-sided conductive ring of vibrating diaphragm and with conductive ring respectively.
The present invention has following characteristics:
1, simplified the traditional design of condenser loudspeaker, reduced manufacture difficulty and cost, especially in the design of vibrating diaphragm, removed the electric conducting material of assembling a large amount of electric charges of vibrating diaphragm central area, made central area can not assemble a large amount of electric charges.According to the principle of electroacoustic mechanics, peripheral electric charge is more, and the less vibrating diaphragm of central electric charge will be garden platform shape form (see figure 10) when vibration, compares with hemispherical form, and garden platform shape is the piston vibration after more satisfactory periphery is fixed.Bigger elimination the displacement distortion, its frequency response is comparatively smooth.In addition, even user's improper use, imported the ultimate bearing capacity that surpasses condenser loudspeaker of the present invention when vibrating diaphragm central authorities are contacted with fixed electrode fully,, thereby can not produce corona phenomenon owing to the central area of round conductive diaphragm of the present invention is a high-insulation.Thus, the present invention designs great reliability and the fail safe that has improved condenser loudspeaker.
2, be suitable for suitability for industrialized production.
3, end user and the producer two aspects had the good ratio of performance to price.
4, highly reliable and be easy to safeguard.
The invention will be further described below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is a general assembly drawing of the present invention.
Fig. 2 is the electroacoustic transducer exploded view.
Fig. 3 is an electroacoustic transducer profile of the present invention.
Fig. 4 is a traditional electrical sonic transducer profile.
Fig. 5 is the vibrating diaphragm schematic diagram.
Fig. 6 is the plastic plate schematic diagram.
Fig. 7 is a plastic plate A face schematic diagram.
Fig. 8 is a plastic plate B face schematic diagram.
Aspect graph when Fig. 9 is the vibration of traditional vibrating diaphragm.
Aspect graph when Figure 10 is vibrating diaphragm of the present invention vibration.
Embodiment
The present invention includes electroacoustic transducer 1 and guarantee the driver that electroacoustic transducer 1 is worked, wherein, driver is made up of the audio frequency transformer 2 and the voltage-doubler rectifier 3 of annular, sees Fig. 1.
Described electroacoustic transducer 1 is made up of vibrating diaphragm 4, fixed electrode 5 and conductive electrode 6 and plastic plate 7, sees Fig. 2 and Fig. 3.Above-mentioned vibrating diaphragm 4 is round conductive diaphragms, and its bar shaped central area 8 is high-insulations.The conductive ring 11 of vibrating diaphragm is evaporation, deposit or a printed conductive material on vibrating diaphragm 4 matrixes, and conductive ring 11 surface conductivities are 10
6Below the ohm/cm, this vibrating diaphragm 4 can prepare voluntarily with the commercially available metallization macromolecule membrane of aluminizing, method is: paste the quoit that needs reservation with Pressure sensitive adhesive tape paper, 10% sodium hydroxide solution with heating (60 °-70 ° of Celsius temperatures) soaked about about 1 minute then, the aluminium lamination of not pasting the adhesive sticker part comes off oxidation, take Pressure sensitive adhesive tape paper then off, rinse out residual sodium hydroxide solution with clear water again, airing.This is a kind of very economical method.Also can on the macromolecule membrane of insulation fully, directly print the conduction electric material and prepare conductive ring 11.As adopting flange or the direct printing of intaglio mode to obtain with inorganic conductive printing ink (stable in properties, mechanical strength height such as carbon system or silver system, the difficult inorganic printing material of leading that produces electrochemical reaction).
The thickness of conductive ring vibrating diaphragm is set according to designing requirement by the producer, reference value: 2 μ m-12 μ m (being applicable to capacitor earphone, high, medium and low frequency condenser loudspeaker).
Above-mentioned plastic plate 7 is finished by an injection moulding of injection molding machine.Material can be with resistance 3 * 10
10The above polyolefin of ohm/cm, polystyrene, the contour ambroin of polyurethane are recommended with ABS or polycarbonate.
The gross area of the plastic plate 7 of shot moulding should guarantee coverage diagram 5 round conductive diaphragms.After the injection mo(u)lding, the thickness of plastic plate should be thin as much as possible under the situation that guarantees mechanical strength and dielectric voltage withstand intensity, reference value: 0.4-0.6mm.The thickness of the protruding circle 10 of plastic plate is set according to the producer's requirement, reference value: 0.02-1.5mm (being applicable to height, middle pitch condenser loudspeaker), 1.6-5mm (in being applicable to, bass condenser loudspeaker).
The plastic plate 7 of once injection moulding is opened effective vibration area that the area of sound penetrating hole 9 should corresponding vibrating diaphragm 4, and reaches vibrating diaphragm and effectively vibrate about 45% of area, and promptly percent opening is about 45%, to guarantee the entrant sound of condenser loudspeaker.The hole of being opened is uniform hole, garden or square hole, also fence strip-like-shaped hole.
The A face of the plastic plate 7 of once injection moulding (Fig. 7 face) is printed netted fixed electrode 5, its netted fixed electrode is equivalent to the fixed electrode (5A among Fig. 4,5B) in the traditional design, printed material is inorganic conductive printing ink (carbon system, a silver system all can), and printing method adopts offset plate or silk-screen all can.The surface of the protruding circle 10 of the B face of plastic plate 7 (Fig. 8 face) is printed or coating electrically conductive electrode 6.Its conductive electrode is equivalent to the quoit formula conductive electrode (2A among Fig. 4,2B) in the conventional condenser loudspeaker design.The same mesh electrode of printed material and method also can directly apply electric conducting materials such as mineral-type electrically conductive ink.
The gross area of the netted fixed electrode of printing on the plastic plate of shot moulding is answered the 45-50% of the effective area of corresponding vibrating diaphragm, this is equivalent to the real surface long-pending (the fixed polar plate area of conventional condenser loud speaker is generally, metallic plate or the copper clad plate of plate surface area-perforated area=percent opening 45-50%) of conventional condenser loud speaker fixed electrode.Attention: print hole on mesh electrode and the disposable injected-formative plastic plate the edge should leave the space, to avoid marginal discharge, reference value interspaces: 0.1-0.5mm.
Corresponding vibrating diaphragm conductive ring 11 is pointed on protruding flange 10 surfaces of disposable injection molding plastic plate, and closely contacts with vibrating diaphragm conductive ring 11.Its surface should all be printed or coating electrically conductive printing ink.
Disposable injection molding plastic plate projection flange 10 face widths are set by the producer.Should consider to guarantee the reliability that the printed conductive electrode contacts with vibrating diaphragm during setting and guarantee that vibrating diaphragm can tight surface at flange.Reference value: 10-15mm.
In above-mentioned vibrating diaphragm 4, its conductive ring area (the interior I zone of dotted line among Fig. 5) that effectively vibrates in the area accounts for the 75-90% that vibrating diaphragm effectively vibrates area, and its invalid vibration area (the outer II zone of dotted line among Fig. 5) accounts for the 15-25% of the vibrating diaphragm gross area.The invalid vibration area of vibrating diaphragm refers to plastic plate projection flange 10 and the tight contact portion of vibrating diaphragm conductive ring.
The ratio of the input and output of the audio frequency transformer 2 of described annular is 1: 80-1: 150, and it is to adopt the annular core coiling, annular core has higher magnetic conduction density, makes the frequency response range of transformer broad and smooth than being easier to.Before the present invention's design, still there is not the precedent that adopts annular audio frequency transformer to be used for condenser loudspeaker.
Described voltage-doubler rectifier 3 is to form with microminiature rectifier diode and superminiature capacitor, is 3 * 10 with conductance
10The above high molecule plastic package curing of ohm/cm forms.Its output voltage is 1000-5000V.Adopt the purpose of high insulating material sealing and curing to be: to improve its fail safe, reliability, small-sized easy mounting characteristics.Before the present invention, still do not have and adopt small-sized high insulated enclosure to solidify the precedent that voltage-doubler rectifier is used for condenser loudspeaker.
Above-mentioned annular audio frequency transformer 2 is an output transformer, the two poles of the earth of its primary coil are connected with audio input signal, the two poles of the earth of secondary coil are connected with netted fixed electrode 5 on two plastic plates 7 respectively, secondary coil also has a centre cap, and this centre cap is connected with the output of voltage-doubler rectifier 3.
Above-mentioned voltage-doubler rectifier 3 has 4 extraction electrodes, wherein two electrodes are input electrode, be connected with civil power, two electrodes are output electrode in addition, wherein anodally be connected with the centre cap of annular audio frequency transformer 2, the conductive electrode 6 on negative pole and two plastic plates 7 on the protruding flange 10 is connected.
The involutory bonding back of two plastic rings of electroacoustic transducer and round conductive diaphragm (available conducting resinl is bonding) reinforces with the gong bolt.Fixed electrode (netted printed electrode) and conductive electrode (printing conductive electrode) are connected with driver, and available conductive adhesive is drawn lead, and each lead is connected with the annular audio frequency transformer of driver and the voltage-doubler rectifier of curing then.
Claims (6)
1, the condenser loudspeaker that a kind of round conductive diaphragm and injection mo(u)lding, printed electrode constitute, the driver that comprises electroacoustic transducer and the work of assurance electroacoustic transducer, wherein, electroacoustic transducer is made up of vibrating diaphragm, fixed electrode and conductive electrode, feature of the present invention is described vibrating diaphragm matrix adopting macromolecule insulating film material, matrix double-facedly is attached with conductive ring except that the bar shaped central area at this.
2, the condenser loudspeaker that constitutes according to the described round conductive diaphragm of claim 1 and injection mo(u)lding, printed electrode, it is characterized in that described fixed electrode is to be printed on the netted electric conducting material that has sound penetrating hole and have protruding flange plastic plate A face, described conductive electrode is the electric conducting material that is printed on the protruding flange of above-mentioned plastic plate B face, and the protruding flange of two above-mentioned plastic plates closely contacts in the face of the two-sided conductive ring of vibrating diaphragm and with conductive ring respectively.
3, the condenser loudspeaker that constitutes according to claim 1 or 2 described round conductive diaphragms and injection mo(u)lding, printed electrode is characterized in that described driver is 3 * 10 by the audio frequency transformer of annular with conductance
10The voltage-doubler rectifier of the high molecule plastic package curing that ohm/cm is above is formed, and the ratio of the input and output of above-mentioned annular audio frequency transformer is 1: 80-1: 150, and the output voltage of above-mentioned voltage-doubler rectifier is 1000-5000V.
4, the condenser loudspeaker that constitutes according to claim 1 or 2 described round conductive diaphragms and injection mo(u)lding, printed electrode, it is characterized in that in described vibrating diaphragm, its conductive ring area that effectively vibrates in the area accounts for the 75-90% that vibrating diaphragm effectively vibrates area, and its invalid vibration area accounts for the 15-25% of the vibrating diaphragm gross area.
5, the condenser loudspeaker that constitutes according to claim 1 or 2 described round conductive diaphragms and injection mo(u)lding, printed electrode, the conductive ring that it is characterized in that described vibrating diaphragm is evaporation, deposit or a printed conductive material on the vibrating diaphragm matrix, the conductive ring surface conductivity is 10
6Below the ohm/cm.
6, the condenser loudspeaker that constitutes according to the described round conductive diaphragm of claim 2 and injection mo(u)lding, printed electrode, it is characterized in that described plastic plate by the disposable injection resistance of injection molding machine 3 * 10
10The above high ambroin of ohm/cm is made, and the area of this plastic plate can cover vibrating diaphragm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99116361A CN1108085C (en) | 1999-02-26 | 1999-02-26 | Ring conductive diaphragm, and injection moulded and printed electrode constituted capacitor loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99116361A CN1108085C (en) | 1999-02-26 | 1999-02-26 | Ring conductive diaphragm, and injection moulded and printed electrode constituted capacitor loudspeaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1232360A CN1232360A (en) | 1999-10-20 |
| CN1108085C true CN1108085C (en) | 2003-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99116361A Expired - Fee Related CN1108085C (en) | 1999-02-26 | 1999-02-26 | Ring conductive diaphragm, and injection moulded and printed electrode constituted capacitor loudspeaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1108085C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100850872B1 (en) * | 2006-06-28 | 2008-08-07 | 양길섭 | An electrostatic speaker having a ventilative diaphragm |
| CN102355619A (en) * | 2011-08-15 | 2012-02-15 | 董斌 | Electrostatic flat panel speaker |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5054081A (en) * | 1985-04-02 | 1991-10-01 | West Roger A | Electrostatic transducer with improved bass response utilizing disturbed bass resonance energy |
| US5206914A (en) * | 1990-01-05 | 1993-04-27 | Koss Corporation | Electrostatic acoustic transducer having extremely thin diaphragm substrate |
| US5392358A (en) * | 1993-04-05 | 1995-02-21 | Driver; Michael L. | Electrolytic loudspeaker assembly |
| US5590212A (en) * | 1993-07-30 | 1996-12-31 | Sony Corporation | Diaphragm for a capacitance type loudspeaker |
-
1999
- 1999-02-26 CN CN99116361A patent/CN1108085C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5054081A (en) * | 1985-04-02 | 1991-10-01 | West Roger A | Electrostatic transducer with improved bass response utilizing disturbed bass resonance energy |
| US5054081B1 (en) * | 1985-04-02 | 1994-06-28 | Roger A West | Electrostatic transducer with improved bass response utilizing distributed bass resonance energy |
| US5206914A (en) * | 1990-01-05 | 1993-04-27 | Koss Corporation | Electrostatic acoustic transducer having extremely thin diaphragm substrate |
| US5392358A (en) * | 1993-04-05 | 1995-02-21 | Driver; Michael L. | Electrolytic loudspeaker assembly |
| US5590212A (en) * | 1993-07-30 | 1996-12-31 | Sony Corporation | Diaphragm for a capacitance type loudspeaker |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1232360A (en) | 1999-10-20 |
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