CN113179471A - Electrostatic loudspeaker system and driving device thereof - Google Patents
Electrostatic loudspeaker system and driving device thereof Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
- H04R19/02—Loudspeakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
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Abstract
The invention provides an electrostatic loudspeaker system and a driving device thereof, comprising a first electrode plate, a first diaphragm bracket, a first diaphragm bracket, a second electrode plate, a second diaphragm bracket, a second diaphragm bracket and a third electrode plate which are assembled in sequence, wherein the first electrode plate, the first diaphragm bracket and a conductive coating on the left side of the second electrode plate jointly form a high-pitch loudspeaker structure; the electro-conductive cladding material on second electrode board right side, the second vibrating diaphragm, second vibrating diaphragm support, third electrode board constitute bass speaker structure, still include high voltage direct current module, passive frequency division circuit and each secondary phase place are unanimous, take a percentage parallelly connected first audio transformer and second audio transformer, produce louder power under the equal size area condition, promote the sound permeability, solve the low frequency response problem that traditional audio transformer leads to because of the iron core framework, and satisfy aforementioned bass speaker's playback power.
Description
Technical Field
The present invention relates to the field of audio playback technologies, and in particular, to an electrostatic speaker system and a driving device thereof.
Background
The existing loudspeakers are divided into moving-coil loudspeakers, moving-iron loudspeakers, constant-magnetic loudspeakers and electrostatic transducers according to the structural principle; the electrostatic loudspeaker is used as a core device of high-end audio and video products in the current market, is commonly used on equipment such as a headphone, a sound box and the like, and has the sound amplification principle that a conductive vibrating diaphragm is arranged in a fixed electrode plate to form a flat plate type capacitor structure.
In terms of performance, the vibrating diaphragm of the electrostatic loudspeaker is very light and thin, has extremely small mass, and even can ignore inertial motion and cutting vibration of the diaphragm, so the vibrating diaphragm has good dynamic response capability and tiny signal revealing force; meanwhile, due to the fact that the area of a large vibration system is obtained, the effective vibration area of the vibration system is more than 4 times that of a traditional moving coil energy conversion structure, and therefore the vibration system is easier to form a large intracranial sound field effect and a more natural intracranial virtual image.
Certainly, the electrostatic speaker has certain defects, in the actual assembly and manufacture of the electrostatic speaker, the surface tension of the vibrating diaphragm of the electrostatic speaker can obviously influence the frequency response of the electrostatic speaker, under a high-voltage direct-current power supply with the same size, when the surface tension of the vibrating diaphragm of the electrostatic speaker is increased, the vibrating diaphragm can quickly return to a balance position when vibrating, and the vibration acceleration of the vibrating diaphragm is obviously improved, so that the sensitivity and the signal response speed of the electrostatic speaker are improved, and the dynamic response range and the small signal playback performance of the electrostatic speaker can be favorably expanded.
At the same time, however, the large surface tension increases the surface stiffness of the diaphragm, so that the displacement and flexural deformation of the diaphragm of the electrostatic speaker are reduced, and therefore, sufficient low-frequency sound pressure cannot be generated when a low-frequency signal is reproduced, so that bass response performance is deteriorated, and the reverberation time of the low-frequency signal is significantly reduced.
In short, there is a huge contradiction in the diaphragm tension setting of the traditional electrostatic speaker, and increasing the diaphragm tension will result in a decrease in low-frequency sound pressure and an increase in low-frequency cut-off frequency; the reduction of the diaphragm tension reduces the sensitivity and dynamic response range of the speaker, so that the playback effect of weak signals is deteriorated, and the two cannot be obtained under the conventional single electrostatic speaker unit structure.
The electrostatic amplifier for adapting and driving the electrostatic loudspeaker can be divided into a circuit type active amplifier and a transformer type passive amplifier according to the principle structure, the transformer type passive amplifier is commonly found in the early electrostatic loudspeaker driving device, the core structure of the electrostatic amplifier is an audio boosting transformer, the general impedance of the power amplifier of 4 omega-8 omega can be matched to the electrostatic earphone of 10k omega-20 k omega, and the audio alternating voltage of 20Hz-20kHz is boosted to a higher level so as to drive the diaphragm to move in a high-voltage electric field. This requires that the step-up ratio and phase of the audio step-up transformer be as consistent as possible within the required frequency range. Among them, 20Hz-50Hz bass audio signals need large-size, multi-turn long coil audio transformer for boosting, and the multi-turn long coil will generate larger parasitic inductance, resulting in fast attenuation of signals above 2kHz and great distortion of phase. In short, there is a huge contradiction in playing back a full-band music signal by using a single audio transformer, and increasing the transformer volume and the number of turns of a secondary coil will increase the inductance, resulting in rapid attenuation of a high-frequency signal; reducing the transformer size and the number of secondary windings results in an upward shift in operating frequency and an insufficient step-up ratio in the low frequency operating region. At present, under the condition of a single EI-type audio transformer, the EI-type audio transformer and the EI-type audio transformer can not be obtained at the same time, and the excellent frequency response performance of the electrostatic loudspeaker can not be fully exerted.
Therefore, it is desirable to provide an electrostatic speaker system and a driving device thereof to solve the above-mentioned problems.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides an electrostatic speaker system and a driving device thereof, which are used for solving the problem of huge contradiction in diaphragm tension setting of the traditional single electrostatic speaker unit; and the audio transformer of the electrostatic amplifier matched with the audio transformer plays back the full-band music signals, which has a great contradiction.
The invention provides an electrostatic loudspeaker system and a driving device thereof, comprising a first diaphragm, a second diaphragm, a first electrode plate with holes, a second electrode plate with holes, a third electrode plate with holes, a first diaphragm support and a second diaphragm support, wherein conductive coatings are formed on the surfaces of the two sides of the first diaphragm and the second diaphragm, and meanwhile, the first electrode plate with holes, the first diaphragm support, the first diaphragm support, the second electrode plate with holes, the second diaphragm support, the second diaphragm support and the third electrode plate with holes are assembled in sequence, and the first electrode plate with holes, the first diaphragm support and the conductive coating on the left side of the second electrode plate jointly form a loudspeaker structure; and the conductive coating on the right side of the second electrode plate, the second diaphragm support and the third electrode plate jointly form a bass loudspeaker structure.
Preferably, the conductive coatings on the left sides of the first electrode plate, the first diaphragm bracket and the second electrode plate are all circular, have equal radiuses, and have coincident circle centers; the second electrode plate, the second vibrating diaphragm support and the third electrode plate are circular, the radiuses of the second electrode plate, the second vibrating diaphragm support and the third electrode plate are equal, the circle centers of the second electrode plate and the third electrode plate are overlapped, and meanwhile the radius of the first vibrating diaphragm is different from the radius of the second vibrating diaphragm.
Preferably, the first electrode plate and the third electrode plate are provided with conductive coatings on the side faces facing the diaphragm, the two sides of the second electrode plate are provided with conductive coatings, and the areas of the conductive coatings on the two sides are different.
Preferably, the punched holes of the first electrode plate and the third electrode plate are uniformly distributed in a circular shape, the aperture ratio of the hole area on the surface of the first electrode plate is 60-85%, and the aperture ratio of the hole area of the third electrode plate is 30-55%.
Preferably, the area of the second electrode plate facing the first diaphragm has an aperture ratio equal to the surface aperture ratio of the first electrode plate, and the area of the second electrode plate facing the second diaphragm has an aperture ratio equal to the surface aperture ratio of the third electrode plate.
Preferably, the surfaces of the first electrode plate, the second electrode plate and the third electrode plate are provided with corresponding low-order frequency division circuits, and the areas where the low-order frequency division circuits are located are outside the projection area of the diaphragm.
Preferably, the surface tension of the first diaphragm is 1kPa-5kPa, the surface tension of the second diaphragm is 0.3kPa-1.2kPa, and the surface tension of the first diaphragm is higher than that of the second diaphragm.
Preferably, the first electrode plate, the second electrode plate and the third electrode plate are all PCB plates.
The driving device for driving the electrostatic speaker system as claimed in any one of claims 1 to 8, comprising a high voltage dc module, a passive crossover circuit, a first audio transformer and a second audio transformer, wherein the first audio transformer and the second audio transformer have different transformation ratios, secondary adaptive impedances, and operating frequencies; and the phases of the secondary coils of the first audio transformer and the second audio transformer are consistent, taps are connected in parallel, and the taps are used as output ends to be electrically connected with the electrostatic loudspeaker unit.
Preferably, the lowest response frequency of the first audio transformer is between 500Hz and 1000Hz, and the lowest response frequency of the second audio transformer is between 20Hz and 50 Hz.
Compared with the related art, the electrostatic loudspeaker system and the driving device thereof provided by the invention have the following beneficial effects:
the invention has reasonable design, and the full frequency system consisting of the traditional single transformer and the single electrostatic loudspeaker is changed into a frequency division combined system of a double loudspeaker and a double audio frequency transformer; compared with the traditional electrostatic loudspeaker, the design of the invention separately processes the electrostatic loudspeaker from the complicated wide-frequency music playback problem, and the bass diaphragm with large size and area, small surface tension and longer stroke is used for playing back low-frequency signals with high power and strong sound pressure; the high-pitch diaphragm with small size and area, large surface tension and extremely thin thickness is used for playing back a low-power high-frequency signal. The frequency response performance of the electrostatic loudspeaker is obviously superior to that of the traditional full-size electrostatic loudspeaker, and the two units can generate larger sound power under the condition of the same size area and improve the sound transmission performance due to the frequency division treatment under different working conditions;
compared with the traditional passive boosting device, the design of the invention separates the traditional single audio transformer into a high-low audio combined transformer. The first transformer with the multiple secondary winding turns, the large width of the iron core steel frame and the large wire diameter is used for boosting low-frequency and medium-low-frequency signals, the large width of the iron core steel frame can ensure that the lower limit of the working frequency of the transformer is lower than the range of bass signals, the problem of low-frequency response of the traditional audio transformer caused by the iron core framework is solved, and the playback power of the woofer is met. The second transformer with low inductance, small iron core steel frame and thin wire diameter is used for boosting middle-high frequency and high-frequency signals, and the low inductance can enable the high-frequency attenuation starting point of the transformer to be higher than the upper limit of high-frequency signals, so that the wide-frequency-band response characteristic of the electrostatic loudspeaker is exerted.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention;
FIG. 2 is a schematic diagram of an electrostatic speaker according to the present invention;
FIG. 3 is a schematic diagram of a surface plating layer A of a second electrode plate of an electrostatic speaker according to the present invention;
fig. 4 is a schematic diagram of the surface plating layer of the second electrode plate B of the electrostatic speaker of the present invention.
1. The high-voltage direct current module comprises a first vibrating diaphragm, 2, a second vibrating diaphragm, 3, a first electrode plate, 4, a second electrode plate, 5, a third electrode plate, 6, a first vibrating diaphragm support, 7, a second vibrating diaphragm support, 8, a high-voltage direct current module, 9, a passive frequency division circuit, 10, a first audio transformer, 11, a second audio transformer, 12 and a conductive coating.
Detailed Description
The invention is further described with reference to the following figures and embodiments.
Referring to fig. 1-4, an electrostatic speaker system and a driving device thereof, including a first diaphragm 1, a second diaphragm 2, a first electrode plate 3 with holes, a second electrode plate 4 with holes, a third electrode plate 5 with holes, a first diaphragm support 6 and a second diaphragm support 7, wherein conductive coatings 12 are formed on both side surfaces of the first diaphragm 1 and the second diaphragm 2, and the first electrode plate 3 with holes, the first diaphragm support 6, the first diaphragm 1, the first diaphragm support 6, the second electrode plate 4 with holes, the second diaphragm support 7, the second diaphragm 2, the second diaphragm support 7 and the third electrode plate 5 with holes are assembled in this order;
the audio signal frequency division is that two independent complete speaker units of high pitch, bass are replayed, foraminiferous first electrode board 3, first vibrating diaphragm 1, first vibrating diaphragm support 6 and the left conductive coating 12 of second electrode board 4 constitute high pitch speaker structure jointly, and the conductive coating 12 on second electrode board 4 right side, second vibrating diaphragm 2, second vibrating diaphragm support 7, third electrode board 5 constitute bass speaker structure jointly.
The conductive coating 12 on the left side of the first electrode plate 3, the first diaphragm 1, the first diaphragm bracket 6 and the second electrode plate 4 are all round, the radiuses are equal, and the centers of circles are coincident; the second electrode plate 4, the second diaphragm 2, the second diaphragm bracket 7 and the third electrode plate 5 are circular, have equal radius, have coincident circle centers, and the radius of the first diaphragm 1 is different from the radius of the second diaphragm 2; meanwhile, the surface tension of the first diaphragm 11 is 1kPa-5kPa, the surface tension of the second diaphragm 22 is 0.3kPa-1.2kPa, and the surface tension of the first diaphragm 11 is higher than that of the second diaphragm 22.
The first electrode plate 3 and the third electrode plate 5 are both provided with a conductive coating 12 on the side facing the diaphragm, the two sides of the second electrode plate 4 are both provided with conductive coatings 12, and the areas of the conductive coatings 12 on the two sides are different.
The punching shapes of the first electrode plate 3 and the third electrode plate 5 are uniformly distributed in a round shape, meanwhile, the aperture ratio of the perforated area on the surface of the first electrode plate 3 is 60-85%, and the aperture ratio of the perforated area of the third electrode plate 5 is 30-55%.
The area aperture ratio of the second electrode plate 4 facing the first diaphragm 1 is equal to the surface aperture ratio of the first electrode plate 3, and the area aperture ratio of the second diaphragm 2 facing the second diaphragm is equal to the surface aperture ratio of the third electrode plate 5.
The surfaces of the first electrode plate 3, the second electrode plate 4 and the third electrode plate 5 are provided with corresponding low-order frequency division circuits, and the areas of the low-order frequency division circuits are outside the projection area of the diaphragm.
The surface tension of the first diaphragm 1 is 1kPa-5kPa, the surface tension of the second diaphragm 2 is 0.3kPa-1.2kPa, and the surface tension of the first diaphragm 1 is higher than that of the second diaphragm 2.
The first electrode plate 3, the second electrode plate 4 and the third electrode plate 5 are all PCB plates.
A driving device for driving the electrostatic speaker system of any one of claims 1-8, the driving device is electrically connected to the speaker system through a conducting wire, and comprises a high voltage dc module 8, a passive crossover circuit 9, a first audio transformer 10 and a second audio transformer 11, the first audio transformer 10 and the second audio transformer 11 have different transformation ratios, secondary adaptive impedances, and operating frequencies; the respective secondary coils of the first audio transformer 10 and the second audio transformer 11 are in phase agreement, and taps are connected in parallel and electrically connected as an output terminal to the electrostatic speaker unit portion.
The lowest response frequency of the first audio transformer 10 is in the range of 500Hz-1000Hz and the lowest response frequency of the second audio transformer 11 is in the range of 20Hz-50 Hz.
It should be noted that, referring to fig. 1-2, the electrostatic speaker provided in this embodiment has the same structure as the conventional electrostatic speaker, in that the aforementioned high-pitched speaker portion and low-pitched speaker portion in the invention are not different from the overall structure of the conventional electrostatic speaker.
Referring to fig. 1-2, the electrostatic speaker system and the conventional electrostatic speaker system are different in structure in that a complete audio signal is not played back by a single electrostatic speaker, but is played back by the tweeter portion and the woofer portion after being frequency-divided by a frequency divider circuit, and is coupled as a complete full-band sound in a sound field.
Referring to fig. 3-4, there is no gap between the left plating layer of the second electrode plate 4 and the second electrode plate 4, and there is no gap between the right plating layer of the second electrode plate 4 and the second electrode plate 4, and this structure can be realized on a glass fiber PCB plate by etching the double-sided copper clad plate, and the thickness of the second electrode plate 4 is preferably 1.6mm-2 mm.
It should be noted that the conductive plating layer 12 on the left side of the second electrode plate 4 and the conductive plating layer 12 on the right side of the second electrode plate 4 are loaded with high-voltage ac signals with different frequency bands and different voltages, so that the distance between the two layers should be as large as possible to reduce the inter-plate capacitance generated between the two plating layers and avoid the interference of high-pitch signal components to the bass electrostatic speaker.
Referring to fig. 2, the first electrode plate 3, the second electrode plate 4, the third electrode plate 5, the first diaphragm support 6, and the second diaphragm support 7 are led out by wires through the strip-shaped protruding portions at the edges, and the wires are connected with the first audio transformer 10, the second audio transformer 11, and the dc high voltage module one by one according to the circuit shown in fig. 1.
On the basis of the above structure, the aperture ratio of the conductive plating layer 12 area on the left side of the first electrode plate 3 and the second electrode plate 4 is not consistent with the aperture ratio of the conductive plating layer 12 area on the right side of the third electrode plate 5 and the second electrode plate 4; like this, form electric capacity between first electrode board 3 and the 4 left sides of second electrode board, and formed stronger electric field drive effect between 4 left side cladding materials of second electrode board and first vibrating diaphragm 1, form the sound wave through the forced vibration of first vibrating diaphragm 1 to through the strong sound permeability structure of punching a hole on the first electrode board 3, go out high frequency, well high frequency sound without the resistance ground transmission.
Similarly, form electric capacity between third electrode board 5 and the 4 right sides of second electrode board, and formed extremely strong electric field drive effect between conductive coating 12 on the 4 right sides of second electrode board and second vibrating diaphragm 2, form the sound wave through the forced vibration of second vibrating diaphragm 2 to through the aperture weak sound transmission nature structure on second electrode board 4, the third electrode board 5, hinder the transmission of high frequency signal, only make low frequency, well low frequency sound transmit smoothly.
The reason for adopting the above arrangement is that the medium-high frequency sound wave has a short wavelength and is obviously affected by the acoustic damping effect of the electrode plate, so that the first electrode plate 3 only needs to keep the opening uniform and improve the opening rate as much as possible; the low-frequency sound wave has longer wavelength and larger power, and mainly drives the air pressure intensity change by the displacement of the vibrating diaphragm to finally generate bass sound pressure, so the low-frequency sound wave has smaller sound resistance effect by the polar plate; therefore, the lower opening rate is adopted to improve the uniformity degree of the electric field force as much as possible.
The aperture ratio of the right side coating region of the third electrode plate 5 and the right side coating region of the second electrode plate 4 should not be lower than 25%, the second electrode plate 4 and the third electrode plate 5 also have the function of adjusting the cavity pressure in the vibration system, and the too low aperture ratio can cause the air pressure in the cavity to be released rapidly, thereby affecting the response capability of low-frequency signals.
The surface tension stress of the first vibrating diaphragm 1 is inconsistent with that of the second vibrating diaphragm 2, therefore, the first vibrating diaphragm 1 with larger tension stress and smaller area is restrained and has larger structural rigidity when being driven by the electric fields of the electrode plates at two sides, and can rapidly respond to the middle-high frequency signals with smaller power and can return to the balance position in shorter reverberation time, thereby realizing sensitive transient response, and the second vibrating diaphragm 2 with smaller tension stress and larger area is restrained less when being driven by the electric fields of the electrode plates at two sides, thereby realizing high-power sound pressure driving and low-frequency signal response of large bending deformation, and further achieving the frequency response capability of an ultra-wide frequency band.
In addition, the difference with the conventional electrostatic speaker driving device is that the audio boosting part in the invention does not use a single full-band audio transformer, but adopts a structure of two-band frequency division and independent boosting. In principle, through multi-band distribution, each audio transformer works in the most suitable frequency range, and the audio signal boosting of any frequency band can be met, so that the final-stage electrostatic loudspeaker is driven in a full-band and non-attenuation manner.
As shown in fig. 1, the lowest effective response frequency of the first audio transformer 10 is 500Hz-1000Hz, and the lowest effective response frequency of the second audio transformer 11 is 20-30Hz, it should be noted that the lowest effective response frequency of the first audio transformer 10 is not lower than 500Hz, and too low response frequency tends to increase the parasitic inductance of the audio transformer, so that the medium-high frequency signal is rapidly attenuated under the action of the inductance, and cannot reach the upper limit of the working frequency of 20kHz under normal working conditions.
As shown in fig. 2 to 3, the area of the conductive plating layer 12 on the left side of the first electrode plate 3 and the second electrode plate 4 preferably has an open porosity R1 in the range of 60% to 85%, and the optimal open porosity is 81.25%.
As shown in fig. 2 and 4, the area of the conductive plating layer 12 on the right side of the second electrode plate 4 and the opening ratio R2 of the third electrode plate 5 preferably range from 30% to 55%, and the optimum opening ratio is 40%.
As shown in FIG. 2, the preferable range of the surface tension of the first diaphragm 1 is 1kPa-5kPa, the optimum tension is influenced by the material, and the optimum range is 2kPa-3kPa under the polyester material. The preferable range of the surface tension of the second diaphragm 2 is 0.3kPa-1.2kPa, and the optimal range of the tension under the polyester material is 0.8kPa-1 kPa.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides an electrostatic loudspeaker system, including first vibrating diaphragm, the second vibrating diaphragm, foraminiferous first electrode board, foraminiferous second electrode board, foraminiferous third electrode board, first vibrating diaphragm support and second vibrating diaphragm support, and first vibrating diaphragm, the both sides surface of second vibrating diaphragm all is formed with conductive coating, foraminiferous first electrode board simultaneously, first vibrating diaphragm support, first vibrating diaphragm support, foraminiferous second electrode board, second vibrating diaphragm support, the second vibrating diaphragm, second vibrating diaphragm support and foraminiferous third electrode board are according to this order equipment, its characterized in that: the first electrode plate with the hole, the first diaphragm support and the conductive coating on the left side of the second electrode plate form a high-pitch loudspeaker structure together; and the conductive coating on the right side of the second electrode plate, the second diaphragm support and the third electrode plate jointly form a bass loudspeaker structure.
2. The electrostatic speaker system as claimed in claim 1, wherein the conductive coatings on the left sides of the first electrode plate, the first diaphragm holder, and the second electrode plate are all circular, and have equal radii and coincident centers; the second electrode plate, the second vibrating diaphragm support and the third electrode plate are circular, the radiuses of the second electrode plate, the second vibrating diaphragm support and the third electrode plate are equal, the circle centers of the second electrode plate and the third electrode plate are overlapped, and meanwhile the radius of the first vibrating diaphragm is different from the radius of the second vibrating diaphragm.
3. The electrostatic speaker system as claimed in claim 2, wherein the first electrode plate and the third electrode plate are each provided with a conductive coating on a side facing the diaphragm, and the second electrode plate is provided with a conductive coating on both sides, and the conductive coatings on both sides have different areas.
4. The electrostatic speaker system as claimed in claim 1, wherein said first electrode plate and said third electrode plate are punched in a uniformly distributed circular shape, and the hole ratio of the perforated area on the surface of said first electrode plate is 60% -85%, and the hole ratio of the perforated area on said third electrode plate is 30% -55%.
5. The electrostatic speaker system of claim 1 wherein the area of said second electrode plate facing said first diaphragm has an opening area ratio equal to the surface opening area ratio of said first electrode plate and the area of said second electrode plate facing said second diaphragm has an opening area ratio equal to the surface opening area ratio of said third electrode plate.
6. The electrostatic speaker system as claimed in claim 1, wherein the first electrode plate, the second electrode plate and the third electrode plate are respectively provided with a low-order frequency-dividing circuit on their surfaces, and the low-order frequency-dividing circuit is located outside the projection area of the diaphragm.
7. The electrostatic speaker system of claim 1 wherein said first diaphragm has a surface tension of 1kPa to 5kPa, said second diaphragm has a surface tension of 0.3kPa to 1.2kPa, and said first diaphragm has a higher surface tension than said second diaphragm.
8. The electrostatic speaker system as claimed in claim 1, wherein said first electrode plate, said second electrode plate and said third electrode plate are all PCB plates.
9. The driving device for driving the electrostatic speaker system as claimed in any one of claims 1 to 8, comprising a high voltage dc module, a passive crossover circuit, a first audio transformer and a second audio transformer, wherein said first audio transformer and said second audio transformer have different transformation ratios, secondary adaptive impedances, and operating frequencies; and the phases of the secondary coils of the first audio transformer and the second audio transformer are consistent, taps are connected in parallel, and the taps are used as output ends to be electrically connected with the electrostatic loudspeaker unit.
10. The electrostatic speaker driving device as claimed in claim 9, wherein the lowest response frequency of said first audio transformer is 500Hz-1000Hz, and the lowest response frequency of said second audio transformer is 20Hz-50 Hz.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3931469A (en) * | 1974-06-21 | 1976-01-06 | Koss Corporation | Crossover network for a multi-element electrostatic loudspeaker system |
| CN107040853A (en) * | 2017-04-17 | 2017-08-11 | 头领科技（昆山）有限公司 | A kind of loudspeaker and the earphone with the loudspeaker |
| CN209642967U (en) * | 2019-06-13 | 2019-11-15 | 黄海 | A kind of combined type electrostatic electroacoustic transducer |
| US20210297788A1 (en) * | 2018-08-08 | 2021-09-23 | Graphaudio Inc. | High volume manufacturing of micro electrostatic transducers |
-
2021
- 2021-04-26 CN CN202110455722.6A patent/CN113179471A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3931469A (en) * | 1974-06-21 | 1976-01-06 | Koss Corporation | Crossover network for a multi-element electrostatic loudspeaker system |
| CN107040853A (en) * | 2017-04-17 | 2017-08-11 | 头领科技（昆山）有限公司 | A kind of loudspeaker and the earphone with the loudspeaker |
| US20210297788A1 (en) * | 2018-08-08 | 2021-09-23 | Graphaudio Inc. | High volume manufacturing of micro electrostatic transducers |
| CN209642967U (en) * | 2019-06-13 | 2019-11-15 | 黄海 | A kind of combined type electrostatic electroacoustic transducer |
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