CN209642967U - A kind of combined type electrostatic electroacoustic transducer - Google Patents
A kind of combined type electrostatic electroacoustic transducer Download PDFInfo
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- CN209642967U CN209642967U CN201920880975.6U CN201920880975U CN209642967U CN 209642967 U CN209642967 U CN 209642967U CN 201920880975 U CN201920880975 U CN 201920880975U CN 209642967 U CN209642967 U CN 209642967U
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- electrode plate
- diaphragm
- vibrating diaphragm
- frequency
- film ring
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Abstract
The utility model discloses a kind of combined type electrostatic electroacoustic transducers, including electrode plate, taut film ring and vibrating diaphragm, the vibrating diaphragm includes low frequency vibrating diaphragm and high-frequency diaphragm, the electrode plate includes first electrode plate, the second combination electrode plate and third electrode plate, the taut film ring includes the first taut film ring and the second taut film ring, low frequency vibrating diaphragm two sides are respectively arranged with the first coating and the second coating, and the high-frequency diaphragm two sides are respectively arranged with third coating and the 4th coating；The low frequency vibrating diaphragm is arranged on the first taut film ring, and the high-frequency diaphragm is arranged on the second taut film ring；Gap is not present between the second coating for first coating, low frequency vibrating diaphragm, and gap is not present between the third coating, high-frequency diaphragm and the 4th coating；Overall structure is successively arranged from left to right are as follows: first electrode plate, the first taut film ring, low frequency vibrating diaphragm, the second combination electrode plate, the second taut film ring, high-frequency diaphragm and third electrode plate.
Description
Technical field
The utility model relates to speaker technology field, in particular to a kind of combined type electrostatic electroacoustic transducer.
Background technique
At present electroacoustic transducer by transduction principle be divided into moving-coil type energy converter, moving-iron type energy converter, such as magnetic type energy converter and
Electrostatic transducer.
Electrostatic loudspeaker is used as mid- to high-end product currently on the market, and the core component in electrostatic loudspeaker is electrostatic electroacoustic
Energy converter.The transduction principle of conventional electrostatic formula electroacoustic transducer is to be placed in conductive diaphragm in fixed electrode plate to form capacitor,
By the application high voltage direct current bias on vibrating diaphragm conductive layer, and apply audible communication voltage on the electrode plate of two sides.Using just
The Coulomb force that negative electric field generates makes vibrating diaphragm forced vibration generate sound, and passes through the circular hole on the electrode plate of two sides for sound
It radiate.
It is analyzed from basic structure, relative to common moving-coil type energy converter etc., the energy of most electromagnetic transductions
Conversion effect rule is extremely low, and to the response frequency of full frequency band, also range is poor.And electrostatic transducer can provide a kind of energy conversion ratio
Close to 95% electroacoustic transducer, and there is excellent ability on full music frequency.
For the playback of higher levels of recording signal, the vibrating diaphragm of electrostatic transducer is more frivolous, and quality is minimum, even
It can ignore that the head reach and cutting vibrating of vibrating diaphragm, therefore it is with splendid dynamic response and powerful expressive force；Meanwhile
The vibrational system area of electroacoustic transducer is larger, and actual vibration area is ten times or more of traditional electromagnet transduction structure, thus has
There is bigger encephalic sound field, and more naturally ties image force.
And electrostatic transducer equally exists certain defect.Under normal circumstances, electrostatic transducer needs two electrode plates
Even strong high voltage electric field is provided to drive vibrating diaphragm, so that vibrating diaphragm is pushed enough chamber airs, and then generate enough acoustic pressures, this requires vibrations
The area of film and pole plate is huge enough.In brief, the vibrating diaphragm area of conventional electrostatic energy converter, vibrating diaphragm pretightning force and playback frequency
There is huge relevance, improve diaphragm oscillations area or reduce vibrating diaphragm pretightning force, the low frequency response of electrostatic loudspeaker can improved
Meanwhile the deterioration for causing loudspeaker high frequency to respond.Under single anti-electrostatic unit driving method traditional at present, the two can not get both, and one
As be to alleviate problem by constantly improving diaphragm materials characteristic.
Utility model content
The main purpose of the utility model is to provide a kind of combined type electrostatic electroacoustic transducer, can effectively solve to carry on the back
The problems in scape technology.
To achieve the above object, the technical solution that the utility model is taken are as follows:
A kind of combined type electrostatic electroacoustic transducer, including electrode plate, taut film ring and vibrating diaphragm, the vibrating diaphragm include low frequency vibration
Film and high-frequency diaphragm, the electrode plate include first electrode plate, the second combination electrode plate and third electrode plate, the taut film ring packet
The first taut film ring and the second taut film ring are included, low frequency vibrating diaphragm two sides are respectively arranged with the first coating and the second coating, the height
Frequency vibration film two sides are respectively arranged with third coating and the 4th coating；The low frequency vibrating diaphragm is arranged on the first taut film ring, the height
Frequency vibration film is arranged on the second taut film ring；Gap is not present between the second coating for first coating, low frequency vibrating diaphragm, described
Gap is not present between third coating, high-frequency diaphragm and the 4th coating；Overall structure is successively arranged from left to right are as follows: the first electricity
Pole plate, the first taut film ring, low frequency vibrating diaphragm, the second combination electrode plate, the second taut film ring, high-frequency diaphragm and third electrode plate.
Further, the first electrode plate, the second combination electrode plate and third electrode plate surface are provided with punching, described
The punching areas of first electrode plate, the second combination electrode plate and third electrode plate surface is regular hexagon structure, and is arranged
Punch size on the first electrode plate, the second combination electrode plate and third electrode plate is not identical.
Further, the diameter of the first electrode plate, the first taut film ring, low frequency vibrating diaphragm and the second combination electrode plate is homogeneous
Together, and the center of circle is overlapped；The diameter of the second taut film ring, high-frequency diaphragm and third electrode plate is all the same and the center of circle is overlapped.
Further, the high-frequency diaphragm diameter is less than the diameter of low frequency vibrating diaphragm, and the circle of high-frequency diaphragm and low frequency vibrating diaphragm
The heart is not overlapped.
Further, the single side surface of the first electrode plate and third electrode plate that are right against the vibrating diaphragm is provided with conduction
Layer, the second combination electrode plate two sides, which are right against at low frequency vibrating diaphragm and high-frequency diaphragm, is equipped with conductive layer.
Further, the described first taut film ring and the second taut film ring are unilateral conductive annular sheet, the first taut film
Gap is not present between the conductive layer and low frequency vibrating diaphragm of ring, is not present between the conductive layer and high-frequency diaphragm of the second taut film ring
Gap.
Further, the surface pretightning force of the low frequency vibrating diaphragm and the surface pretightning force of high-frequency diaphragm are different, and low frequency shakes
The surface pretightning force of film is less than the surface pretightning force of high-frequency diaphragm.
Further, the surface pretightning force of the low frequency vibrating diaphragm is 0.02N/cm-0.1N/cm, the table of the high-frequency diaphragm
Face pretightning force is 0.05N/cm-0.3N/cm.
Further, the low frequency vibrating diaphragm thickness is different from high-frequency diaphragm thickness, and the thickness of low frequency vibrating diaphragm is greater than high frequency
The thickness of vibrating diaphragm.
Further, the percent opening of the punching areas of the first electrode plate is 15%-35%, second combination electrode
The percent opening of the punching areas of plate is 20%-35%, and the percent opening of the punching areas of the third electrode plate is 45%-80%；
Second combination electrode plate two sides conductive layer is realized by conductive hole and is electrically connected, and two sides conductive layer area area
It is different；
The electrode plate and taut film ring are PCB construction, and the electrode plate and vibrating diaphragm are circular plate structure, the taut film ring
For annular plate-like structure.
Compared with prior art, the utility model has the following beneficial effects: this kind of utility model design is reasonable, user
Just, high and low frequency signal is reset by the diaphragm of different pretightning forces respectively, therefore the low frequency response energy of electrostatic loudspeaker
Power greatly promotes；Again beneficial to regular hexagon and foreign peoples's punching rate, the Mi Pu for eliminating the punching areas of traditional round entrant sound is dead
Angle, therefore its physics frequency dividing harmony is better than traditional circular hole punch pattern through effect, and percent opening is gradually progressive, according to high frequency and
The propagation characteristic of low-frequency sound wave is separately designed, and the low frequency cell of the low pretightning force of large scale facilitates sound field and builds and low frequency time
It puts, the high frequency unit of small size high pretightening force can be realized outstanding medium-high frequency playback；It is changed with this structure design electrostatic electroacoustic
Energy device, is not only able to achieve the good linking of full frequency band audio communication number, moreover it is possible to substantially reduce electrostatic electroacoustic transducers to vibrating diaphragm material
Production requirement, reduce design and produce threshold, it is easy to operate, be suitble to be widely applied.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the electroacoustic transducer of the utility model；
Fig. 2 is the positive structure schematic of second combination electrode plate of the utility model；
Fig. 3 is the schematic diagram of the section structure of the vibrating diaphragm of the utility model.
In figure: 1, electrode plate；2, stretch tight film ring；3, vibrating diaphragm；4, punching；5, first electrode plate；6, the first taut film ring；7, low frequency
Vibrating diaphragm；8, the second combination electrode plate；9, the second taut film ring；10, high-frequency diaphragm；11, third electrode plate；12, the first coating；13,
Second coating；14, third coating；15, the 4th coating.
Specific embodiment
To make technological means of the utility model；Creation characteristic；Reach purpose to be easy to understand with effect, below
In conjunction with specific embodiment, the utility model is further described.
As shown in Figure 1-3, a kind of combined type electrostatic electroacoustic transducer, including electrode plate 1, taut film ring 2 and vibrating diaphragm 3, institute
Stating vibrating diaphragm 3 includes low frequency vibrating diaphragm 7 and high-frequency diaphragm 10, and the electrode plate 1 includes first electrode plate 5,8 and of the second combination electrode plate
Third electrode plate 11, the taut film ring 2 include that the first taut film ring 6 and the second taut film ring 9,7 two sides of low frequency vibrating diaphragm are set respectively
It is equipped with the first coating 12 and the second coating 13,10 two sides of high-frequency diaphragm are respectively arranged with third coating 14 and the 4th coating
15；The low frequency vibrating diaphragm 7 is arranged on the first taut film ring 6, and the high-frequency diaphragm 10 is arranged on the second taut film ring 9；Described
Gap, the third coating 14, high-frequency diaphragm 10 and the 4th are not present between second coating 13 for one coating 12, low frequency vibrating diaphragm 7
Gap is not present between coating 15；Overall structure is successively arranged from left to right are as follows: first electrode plate 5, the first taut film ring 6, low
Frequency vibration film 7, the second combination electrode plate 8, the second taut film ring 9, high-frequency diaphragm 10 and third electrode plate 11.
Wherein, the first electrode plate 5, the second combination electrode plate 8 and 11 surface of third electrode plate are provided with punching 4, institute
4 region of punching for stating 11 surface of first electrode plate 5, the second combination electrode plate 8 and third electrode plate is regular hexagon structure, and
4 size of punching being arranged on the first electrode plate 5, the second combination electrode plate 8 and third electrode plate 11 is not identical.
Wherein, the diameter of the first electrode plate 5, the first taut film ring 6, low frequency vibrating diaphragm 7 and the second combination electrode plate 8 is homogeneous
Together, and the center of circle is overlapped；The diameter of the second taut film ring 9, high-frequency diaphragm 10 and third electrode plate 11 is all the same and the center of circle is overlapped.
Wherein, 10 diameter of high-frequency diaphragm is less than the diameter of low frequency vibrating diaphragm 7, and high-frequency diaphragm 10 and low frequency vibrating diaphragm 7
The center of circle is not overlapped.
Wherein, the single side surface of the first electrode plate 5 and third electrode plate 11 that are right against the vibrating diaphragm 3 is provided with conduction
Layer, 8 two sides of the second combination electrode plate, which are right against at low frequency vibrating diaphragm 7 and high-frequency diaphragm 10, is equipped with conductive layer.
Wherein, the described first taut film ring 6 and the second taut film ring 9 are unilateral conductive annular sheet, the first taut film ring 6
Conductive layer and low frequency vibrating diaphragm 7 between be not present gap, do not deposited between the conductive layer and high-frequency diaphragm 10 of the second taut film ring 9
In gap.
Wherein, the surface pretightning force of the low frequency vibrating diaphragm 7 and the surface pretightning force of high-frequency diaphragm 10 are different, and low frequency vibrating diaphragm
7 surface pretightning force is less than the surface pretightning force of high-frequency diaphragm 10.
Wherein, the surface pretightning force of the low frequency vibrating diaphragm 7 is 0.02N/cm-0.1N/cm, the surface of the high-frequency diaphragm 10
Pretightning force is 0.05N/cm-0.3N/cm.
Wherein, 7 thickness of low frequency vibrating diaphragm is different from 10 thickness of high-frequency diaphragm, and the thickness of low frequency vibrating diaphragm 7 is greater than high frequency
The thickness of vibrating diaphragm 10.
Wherein, the percent opening in 4 region of punching of the first electrode plate 5 is 15%-35%, second combination electrode plate
The percent opening in 84 region of punching is 20%-35%, and the percent opening in 4 region of punching of the third electrode plate 11 is 45%-
80%；
Second combination electrode plate, the 8 two sides conductive layer is realized by conductive hole and is electrically connected, and two sides conductive layer area face
Product is different；
The electrode plate 1 and taut film ring 2 are PCB construction, and the electrode plate 1 and vibrating diaphragm 3 are circular plate structure, described taut
Film ring 2 is annular plate-like structure.
It should be noted that the utility model is a kind of combined type electrostatic electroacoustic transducer, shown in Figure 1, this reality
It applies example a kind of part that electrostatic electroacoustic transducing head is different with Conventional electro-acoustic transducing head structure is provided and be, the apparatus structure
It is followed successively by first electrode plate 5, low frequency vibrating diaphragm 7, the second combination electrode plate 8, high-frequency diaphragm 10, third electrode plate 11；And first
Between electrode plate 5 and low frequency vibrating diaphragm 7 and the second combination electrode plate 8 and high-frequency diaphragm 10, it is respectively formed taut film ring 2 accordingly.
Shown in Figure 3, the low frequency vibrating diaphragm 7 under the structure is followed successively by the first coating 12, low frequency vibrating diaphragm 7 and the second coating
13, high-frequency diaphragm 10 is followed successively by third coating 14, high-frequency diaphragm 10 and the 4th coating 15, between being not present between each coating and vibrating diaphragm
Gap.
High-frequency diaphragm 10 is located at the side of the second combination electrode plate 8, it is whole present it is round, radius and the center of circle not with it is low
Frequency vibration film 7 is consistent, therefore in eccentric placement status.Third electrode plate 11 and the radius of high-frequency diaphragm 10 and the center of circle are consistent, in just
To placement.
Each hole center of the punching 4 of second combination electrode plate 8 is corresponded with first electrode plate 5, with third electrode plate 11
Part is corresponding.
First electrode plate 5, the second combination electrode plate 8 and third electrode plate 11 draw weldering by the PCB route of marginal portion
Point, for realizing electrical connection with electrostatic amplifier.A small number of conductive holes are furnished among second combination electrode plate 8, to realize positive and negative two
The electrical connection of face conductive layer.
On the basis of above structure, the punching 4 of first electrode plate 5, the second combination electrode plate 8 and third electrode plate 11
Percent opening is inconsistent, and from left to right, percent opening successively improves.In this way, first electrode plate 5 and the second combination electrode plate
The capacitor that large area is formd among 8 forms extremely strong Coulomb force driving effect, low frequency to the first coating 12 and the second coating 13
Vibrating diaphragm 7 thus generates enough low-frequency sound pressures, carries out physics frequency dividing, right end high frequency by 4 structure of punching of the second combination electrode plate 8
Vibrating diaphragm 10 also generates enough high frequency acoustic pressures because of same principle, and the two carries out acoustical coupling on the outside of third electrode plate 11, by sound
It does not transfer out by resistance.
It is that vibrating diaphragm 3 drives air to form sound using the reason of above-mentioned set-up mode, pushes enough air that could generate
Enough three frequencies acoustic pressures, and higher vibrating diaphragm pretightning force causes low frequency response characteristic poor, lower vibrating diaphragm pretightning force causes again
Sound field transient response is poor.The two is difficult to take into account, and in the present invention, vibrating diaphragm 3 is by low frequency vibrating diaphragm 7 and 10 groups of high-frequency diaphragm
At the two is fixed on corresponding taut film ring 2 using different pretightning forces, is rationally divided so that high-frequency signals and low frequency be made to interrogate
Work carry out each vibrating diaphragm 3 can in scheduled stroke of reciprocating vibration, and then generate reasonable three frequencies Energy distribution.
The minimum not lower than 15%-20% of the percent opening of first electrode plate 5, the second combination electrode plate 8 is in vibrational system
Equally have the function of adjusting cavity pressure, too low percent opening will lead to intracavitary air pressure can not quick release, influence low frequency vibrating diaphragm 7
Stroke range, and then cause low frequency response ability poor.
In addition to this, with conventional electrostatic loudspeaker difference, first electrode plate 5, the second combination electrode plate 8, third are electric
The form of punching 4 on pole plate 11 is not traditional circular hole, but uses the specific dimensions regular hexagon punching 4 for capableing of Mi Pu,
It is, in principle, that close paving geometry of the regular hexagon as highest number of edges, can be close to 100% percent opening in arrangement,
And uniform wide circuit structure everywhere can be provided in vibrating diaphragm 3 and the wiring of electrode plate 1, thus in the uniform premise of electrostatic field
Under, high percent opening is provided, and then reduce acoustic resistance degree, guarantees that the resistance of electrostatic field uniformity harmony reduces.
The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above.Current row
The technical staff of industry is described in above embodiments and description it should be appreciated that the present utility model is not limited to the above embodiments
Only illustrate the principles of the present invention, on the premise of not departing from the spirit and scope of the utility model, the utility model is also
It will have various changes and improvements, these various changes and improvements fall within the scope of the claimed invention.The utility model
Claimed range is defined by the appending claims and its equivalent thereof.
Claims (10)
1. a kind of combined type electrostatic electroacoustic transducer, including electrode plate (1), taut film ring (2) and vibrating diaphragm (3), it is characterised in that:
The vibrating diaphragm (3) includes low frequency vibrating diaphragm (7) and high-frequency diaphragm (10), and the electrode plate (1) includes first electrode plate (5), second
Combination electrode plate (8) and third electrode plate (11), the taut film ring (2) include the first taut film ring (6) and the second taut film ring (9),
Low frequency vibrating diaphragm (7) two sides are respectively arranged with the first coating (12) and the second coating (13), high-frequency diaphragm (10) two sides
It is respectively arranged with third coating (14) and the 4th coating (15)；The low frequency vibrating diaphragm (7) is arranged on the first taut film ring (6), institute
High-frequency diaphragm (10) are stated to be arranged on the second taut film ring (9)；First coating (12), low frequency vibrating diaphragm (7), the second coating (13)
Between gap is not present, there is no gap between the third coating (14), high-frequency diaphragm (10) and the 4th coating (15)；
Overall structure is successively arranged from left to right are as follows: first electrode plate (5), the first taut film ring (6), low frequency vibrating diaphragm (7), the second compound electric
Pole plate (8), the second taut film ring (9), high-frequency diaphragm (10) and third electrode plate (11).
2. a kind of combined type electrostatic electroacoustic transducer according to claim 1, it is characterised in that: the first electrode plate
(5), the second combination electrode plate (8) and third electrode plate (11) surface are provided with punching (4), the first electrode plate (5), second
Punching (4) region on combination electrode plate (8) and third electrode plate (11) surface is regular hexagon structure, and is arranged described the
Punching (4) size on one electrode plate (5), the second combination electrode plate (8) and third electrode plate (11) is not identical.
3. a kind of combined type electrostatic electroacoustic transducer according to claim 1, it is characterised in that: the first electrode plate
(5), the diameter of the first taut film ring (6), low frequency vibrating diaphragm (7) and the second combination electrode plate (8) is all the same, and the center of circle is overlapped；It is described
The diameter of second taut film ring (9), high-frequency diaphragm (10) and third electrode plate (11) is all the same and the center of circle is overlapped.
4. a kind of combined type electrostatic electroacoustic transducer according to claim 1, it is characterised in that: the high-frequency diaphragm
(10) diameter is less than the diameter of low frequency vibrating diaphragm (7), and the center of circle of high-frequency diaphragm (10) and low frequency vibrating diaphragm (7) is not overlapped.
5. a kind of combined type electrostatic electroacoustic transducer according to claim 1, it is characterised in that: be right against the vibrating diaphragm
(3) single side surface of first electrode plate (5) and third electrode plate (11) is provided with conductive layer, the second combination electrode plate (8) two
Side, which is right against at low frequency vibrating diaphragm (7) and high-frequency diaphragm (10), is equipped with conductive layer.
6. a kind of combined type electrostatic electroacoustic transducer according to claim 1, it is characterised in that: the first taut film ring
(6) and the second taut film ring (9) is unilateral conductive annular sheet, the conductive layer and low frequency vibrating diaphragm (7) of the first taut film ring (6)
Between be not present gap, between the conductive layer and high-frequency diaphragm (10) of the second taut film ring (9) be not present gap.
7. a kind of combined type electrostatic electroacoustic transducer according to claim 1-6, it is characterised in that: described low
The surface pretightning force of frequency vibration film (7) is different from the surface pretightning force of high-frequency diaphragm (10), and the surface pretightning force of low frequency vibrating diaphragm (7)
Less than the surface pretightning force of high-frequency diaphragm (10).
8. a kind of combined type electrostatic electroacoustic transducer according to claim 7, it is characterised in that: the low frequency vibrating diaphragm
(7) surface pretightning force is 0.02N/cm-0.1N/cm, and the surface pretightning force of the high-frequency diaphragm (10) is 0.05N/cm-
0.3N/cm。
9. a kind of combined type electrostatic electroacoustic transducer according to claim 7, it is characterised in that: the low frequency vibrating diaphragm
(7) thickness is different from high-frequency diaphragm (10) thickness, and the thickness of low frequency vibrating diaphragm (7) is greater than the thickness of high-frequency diaphragm (10).
10. a kind of combined type electrostatic electroacoustic transducer according to claim 7, it is characterised in that: the first electrode
The percent opening in punching (4) region of plate (5) is 15%-35%, and punching (4) region of second combination electrode plate (8) is opened
Porosity is 20%-35%, and the percent opening in punching (4) region of the third electrode plate (11) is 45%-80%；
Second combination electrode plate (8) the two sides conductive layer is realized by conductive hole and is electrically connected, and two sides conductive layer area area
It is different；
The electrode plate (1) and taut film ring (2) are PCB construction, and the electrode plate (1) and vibrating diaphragm (3) are circular plate structure, institute
Stating taut film ring (2) is annular plate-like structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920880975.6U CN209642967U (en) | 2019-06-13 | 2019-06-13 | A kind of combined type electrostatic electroacoustic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920880975.6U CN209642967U (en) | 2019-06-13 | 2019-06-13 | A kind of combined type electrostatic electroacoustic transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209642967U true CN209642967U (en) | 2019-11-15 |
Family
ID=68498891
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920880975.6U Expired - Fee Related CN209642967U (en) | 2019-06-13 | 2019-06-13 | A kind of combined type electrostatic electroacoustic transducer |
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| Country | Link |
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| CN (1) | CN209642967U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113179471A (en) * | 2021-04-26 | 2021-07-27 | 王丁宁 | Electrostatic loudspeaker system and driving device thereof |
| CN113596691A (en) * | 2021-07-14 | 2021-11-02 | 王丁宁 | Hollow electrostatic loudspeaker with passive radiation structure |
| WO2023047096A1 (en) * | 2021-09-21 | 2023-03-30 | Warwick Acoustics Limited | Multilayered electrostatic transducer |
-
2019
- 2019-06-13 CN CN201920880975.6U patent/CN209642967U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113179471A (en) * | 2021-04-26 | 2021-07-27 | 王丁宁 | Electrostatic loudspeaker system and driving device thereof |
| CN113596691A (en) * | 2021-07-14 | 2021-11-02 | 王丁宁 | Hollow electrostatic loudspeaker with passive radiation structure |
| WO2023047096A1 (en) * | 2021-09-21 | 2023-03-30 | Warwick Acoustics Limited | Multilayered electrostatic transducer |
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| CF01 | Termination of patent right due to non-payment of annual fee |