CN114630253A - Coaxial electret loudspeaker - Google Patents
Coaxial electret loudspeaker Download PDFInfo
- Publication number
- CN114630253A CN114630253A CN202111412415.6A CN202111412415A CN114630253A CN 114630253 A CN114630253 A CN 114630253A CN 202111412415 A CN202111412415 A CN 202111412415A CN 114630253 A CN114630253 A CN 114630253A
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- China
- Prior art keywords
- speaker
- module
- fixing frame
- electret
- loudspeaker
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005236 sound signal Effects 0.000 claims abstract description 13
- 230000001360 synchronised effect Effects 0.000 claims abstract description 5
- 239000000428 dust Substances 0.000 claims description 8
- 230000005855 radiation Effects 0.000 claims description 7
- 230000001788 irregular Effects 0.000 claims description 2
- 230000004888 barrier function Effects 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 239000003292 glue Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- UUAGAQFQZIEFAH-UHFFFAOYSA-N chlorotrifluoroethylene Chemical group FC(F)=C(F)Cl UUAGAQFQZIEFAH-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- HCDGVLDPFQMKDK-UHFFFAOYSA-N hexafluoropropylene Chemical group FC(F)=C(F)C(F)(F)F HCDGVLDPFQMKDK-UHFFFAOYSA-N 0.000 description 2
- 230000004807 localization Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- -1 Polytetrafluoroethylene Polymers 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
- H04R19/01—Electrostatic transducers characterised by the use of electrets
- H04R19/013—Electrostatic transducers characterised by the use of electrets for loudspeakers
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
- H04R23/02—Transducers using more than one principle simultaneously
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The invention discloses a coaxial electret loudspeaker which comprises a first loudspeaker module, a first fixing frame, a second loudspeaker module and a second fixing frame. A first speaker module driven by an audio signal to generate a low frequency range sound; the first fixing frame is used for fixing the first loudspeaker module; a second speaker module driven by the audio signal to generate mid-high frequency range sound; and the second fixing frame is arranged between the first loudspeaker module and the second loudspeaker module and used for fixing the second loudspeaker module and enabling the second loudspeaker module and the first loudspeaker module to be positioned on the same axis, wherein the first fixing frame and the second fixing frame form a synchronous vibration cavity module.
Description
Technical Field
The present invention relates to a speaker module, and more particularly, to a coaxial electret speaker applied to an earphone.
Background
At present, for the earphone product to meet the requirement of Hi-Res high-resolution sound quality, except for improving the material of the diaphragm, two or more speaker units are generally responsible for outputting sounds in different frequency bands, and the existing earphone product is realized by adopting an arrangement mode, however, the parallel mode basically has two defects, namely a first defect: the plane area occupied by the whole set of speakers is too large, which affects the design of the appearance size of the earphone. The second disadvantage is that: the loudspeakers are respectively placed at different positions, so that mutual interference of output sound pressure of the loudspeakers is easily caused, and the overall acoustic performance and distortion are influenced.
Since the Electret speaker (electric loudspeaker) itself has a medium-high sound quality which is quite beautiful, clear and high-resolution, and is not comparable to the common moving coil speaker, the Electret speaker is very suitable for being applied to the common listening earphone. In addition, the electret speaker has excellent sound localization feeling, and even in the future, the electret speaker can be combined with an electret array (array) mode to provide more excellent sound localization, so that the electret speaker is also very suitable for being applied to a competitive earphone.
However, due to the structural limitation of the general electret speaker, the electret film (membrane) is not easy to generate the low-frequency vibration displacement of the large stroke, so that the electret speaker depends on the general moving coil speaker (moving coil loudspeaker) to supplement the low-frequency response part for some applications.
Therefore, it is an important issue in the industry to improve and provide a "coaxial electret speaker" to avoid the above problems.
Disclosure of Invention
In view of the above problems in the prior art, it is an object of the present invention to provide a coaxial electret speaker to solve the problems in the prior art.
According to one aspect of the present invention, a coaxial electret speaker is provided, which includes a first speaker module, a first fixing frame, a second speaker module, and a second fixing frame. A first speaker module driven by an audio signal to generate a low frequency range sound; the first fixing frame is used for fixing the first loudspeaker module; a second speaker module driven by the audio signal to generate mid-high frequency range sound; and the second fixing frame is arranged between the first loudspeaker module and the second loudspeaker module and used for fixing the second loudspeaker module and enabling the second loudspeaker module and the first loudspeaker module to be positioned on the same axis, wherein the first fixing frame and the second fixing frame form a synchronous vibration cavity module.
In some embodiments, the apparatus further includes a crossover driving module, installed on the first fixing frame and the second fixing frame, electrically connected to the first speaker module and the second speaker module, respectively, and configured to generate an audio signal.
In some embodiments, the frequency division driving module is fixed on the first fixing frame and the second fixing frame through at least one screw.
In some embodiments, the first speaker module is a moving coil speaker and the second speaker module is an electret speaker.
In some embodiments, the second speaker module has an external shape of a rectangle, circle, ellipse, triangle, polygon, irregularity, or arbitrary shape.
In some embodiments, the second fixing frame has a concave portion corresponding to the external shape of the second speaker module to receive and fix the second speaker module.
In some embodiments, the speaker module further includes a dust screen coupled to the second fixing frame to fix the second speaker module, and the dust screen has a plurality of through holes on a surface thereof to serve as sound radiation outlets of the second speaker module.
In some embodiments, the second fixing frame has a sound outlet hole respectively formed above and below the second fixing frame to serve as a sound radiation outlet of the first speaker module.
In order to make the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1A is an exploded perspective view illustrating a first embodiment of the present invention.
Fig. 1B is an exploded perspective view of the first embodiment of the present invention from another viewing angle.
Fig. 1C is a schematic perspective view of the first embodiment of the present invention.
Fig. 2A is an exploded perspective view illustrating a second embodiment of the present invention.
Fig. 2B is an exploded perspective view of another perspective view according to the second embodiment of the present invention.
Fig. 2C is a schematic perspective view illustrating a second embodiment of the present invention.
Fig. 3 is an exploded perspective view of a second speaker module according to an embodiment of the invention.
Description of reference numerals: 10-a first speaker module; 20. 21-a second speaker module; 201-iron net; 202-a barrier layer; 203-electret film; 30-a first mount; 31-a carrier; 31 a-holes; 40-a second mount; 40 a-sound outlet; 41-a recess; 50-a frequency division driving module; 51. 53-round head screws; 52-grub screws; 60. 61-dust screen; 60 a-perforation; 70-axis; 100. 101-coaxial electret speaker.
Detailed Description
For purposes of clarity and convenience in the description, components in the drawings may be shown exaggerated or reduced in size or in scale. In the following description and/or claims, when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present; and when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present, and other words used to describe the relationship between the elements or layers should be interpreted in the same manner. For ease of understanding, like elements in the following embodiments are illustrated with like reference numerals.
Referring to fig. 1A, fig. 1B and fig. 1C together, fig. 1A is an exploded perspective view of a first embodiment of the present invention, and fig. 1B is a perspective view of the first embodiment of the present invention. The coaxial electret speaker 100 includes a first speaker module 10, a first fixing frame 30, a second speaker module 20, and a second fixing frame 40.
The first speaker module 10 is driven by an audio signal to generate a low frequency range sound. The first speaker module 10 has a circular external shape. Preferably, the first speaker module 10 is composed of a Voice-coil speaker (Voice-coil speaker).
The first fixing frame 30 is used for fixing the first speaker module 10. The first fixing frame 30 is generally composed of a circular body and a rectangular bearing portion 31. Holes are formed on both sides of the circular body to allow corresponding fasteners (e.g., flat head screws 52) to pass through, so that the first fixing frame 30 and the second fixing frame 40 can be combined and locked with each other. Holes 31a are formed on two sides of the supporting portion 31 for passing corresponding round head screws 51, so that the frequency division driving module 50 can be fixed on the first fixing frame 30. In addition, the round head screw 51 and the flat head screw 52 are used as the fixing member of the present invention for illustration only and not for limitation.
The second speaker module 20 is driven by an audio signal to generate a middle-high frequency range sound. The second speaker module 20 has a rectangular external shape. Preferably, the second speaker module 20 is composed of an electret speaker. It should be noted that when the second speaker module 20 is driven by an audio signal, it can generate vibration to directly and finely generate fine sound. Specifically, the second speaker module 20 has a charge-nanopore polymer material layer: PTFE membranes, which are sensitive to any input power, produce small vibrations. The second speaker module 20 can reproduce original fine sound without a conventional high voltage amplifier.
The second fixing frame 40 is disposed between the first speaker module 10 and the second speaker module 20. The second fixing frame 40 is used for fixing the second speaker module 20, and making the second speaker module 20 and the first speaker module 10 located on the same axis 70. The second holder 40 has a recess 41 corresponding to the external shape of the second speaker module 20 to receive and hold the second speaker module 20.
The second fixing frame 40 has holes 41a at four corners of the rectangular frame and two sides of the circular body for corresponding fasteners (e.g., flat head screws 52) to pass through, so that the first fixing frame 30 and the second fixing frame 40 can be combined and locked with each other. As shown in fig. 1C, the combined first fixing frame 30 and the second fixing frame 40 form a synchronous vibration cavity module. The first holder 30 is a front cavity, and the second holder 40 is a rear cavity.
As shown in fig. 1A, the second fixing frame 40 has a sound outlet 40a structure. More specifically, the second fixing frame 40 has sound emitting holes 40a on left and right sides of the circular body, respectively, to serve as sound radiation outlets of the first speaker module 10.
It should be noted that, because the sound output of the first speaker module 10 and the sound output of the second speaker module 20 are located on the same axis 70, the radiation of the sound is most concentrated, there is no mutual interference, and the sound quality of the whole frequency response is relatively uniform.
The frequency division driving module 50 is installed on the first fixing frame 30 and the second fixing frame 40. The crossover driving module 50 is electrically connected to the first speaker module 10 and the second speaker module 20, respectively. The crossover driving module 50 is used to generate an audio signal. The audio signal comprises a low-frequency signal, an intermediate-frequency signal and/or a high-frequency signal.
As shown in fig. 1A, the frequency-division driving module 50 is fixed on the first fixing frame 30 and the second fixing frame 40 by screws 51. More specifically, the frequency-division driving module 50 is locked above the bearing portion 31 of the first fixing frame 30 and the second fixing frame 40 by round screws 51. It should be noted that, the coaxial electret speaker 100 according to the embodiment of the present invention is specially designed in terms of volume and area, and the first fixing frame 30 and the second fixing frame 40 are matched to have the functions of carrying the crossover driving module 50 and forming a synchronous vibration cavity module, and the coaxial design can reduce the area occupied by the first speaker module 10 and the second speaker module 20 and the interference between the two on phases.
Referring to fig. 1C, the dust screen 60 is combined with the second fixing frame 40 to further fix the second speaker module 20. The dust screen 60 has a plurality of through holes 60a on its surface to serve as sound radiation outlets of the second speaker module 20. The through hole 60a has a substantially circular shape. It is worth to be noted that the embodiment of the invention adopts a modular design, so that the cavity design can be reduced, and the development time can be shortened.
Next, referring to fig. 2A, fig. 2B and fig. 2C, fig. 2A is an exploded perspective view of a second embodiment of the present invention. Fig. 2B is a schematic perspective view of a second embodiment of the present invention from another viewing angle. The coaxial electret speaker 100 of the first embodiment of the present invention is different from the coaxial electret speaker 101 of the second embodiment in that the second speaker module 21 of the second embodiment has a different size (e.g., larger or smaller) than the second speaker module 20 of the first embodiment, and the rest of the configurations are the same or similar, and will not be described in detail below.
When the second speaker module 21 changes its size according to the design requirement, the sizes of the dust screen 61 and the recess 41 of the second fixing frame 40 need to be adjusted correspondingly to meet the installation requirement. Similarly, holes are formed on both sides of the circular body of the first fixing frame 30 for corresponding fasteners (e.g., flat screws 53) to pass through, so that the first fixing frame 30 and the second fixing frame 40 can be combined and locked with each other.
Referring to fig. 3, fig. 3 is an exploded perspective view of a second speaker module according to an embodiment of the invention. The second speaker module 20 includes a ferrite mesh 201, a barrier layer 202 and an electret film 203. The outermost layer of the second speaker module 20 is an iron mesh 201, and sequentially toward the center, a barrier layer 202 and an electret film 203 are laminated and stacked with each other, wherein the barrier layer 202 is disposed between the iron mesh 201 and the electret film 203.
The barrier layer 202 is actually a spacer or a bonding adhesive, which may be implemented by a back adhesive, a double-sided adhesive, an ultraviolet adhesive, a resin, a glue, or other similar materials. In some embodiments, the adhesive may be black glue, spiral glue, or glues with similar properties.
The electret film 203 may be a non-perfluorinated electret polymer material obtained by copolymerizing vinylidene fluoride (VdF), the monomer copolymerized with VdF includes Hexafluoropropylene (HFP), Chlorotrifluoroethylene (CTFE), Tetrafluoroethylene (TFE), Polytetrafluoroethylene (PTFE), or any combination thereof, and a partially fluorine-containing polymer copolymer may be used as the material of the electret film 203 to satisfy the conditions of charge stability, processability, and price.
The shape of the second speaker module 20 in the first or second embodiment of the present invention is illustrated as a rectangle, but is not limited to the present invention, and the shape of the second speaker module 20 may be a rectangle, a circle, an ellipse, a triangle, a polygon, an irregular shape, or any other shape. This can be achieved, for example, by modifying the shape of the ferrous mesh 201, barrier layer 202, and electret film 203.
In summary, the coaxial electret speaker of the present invention has the following advantages:
(1) the high frequency in the electret has clear sound and distinct sound field positioning, and can easily meet the requirement of high resolution sound quality (Hi-Res).
(2) The coaxial design can reduce the occupied area of the electret and the moving coil loudspeaker and the interference on the phase between the electret and the moving coil loudspeaker. Low frequency and medium-high frequency are divided, which can improve the sound quality and has Low distortion (Low distortion).
(3) The product can increase the variation flexibility of the product and change the monomer with different characteristics according to the requirements of customers.
(4) The modular design can reduce the cavity design and shorten the development time.
The above description is intended to illustrate the present invention in detail by using preferred embodiments, and not to limit the scope of the present invention. It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (8)
1. A coaxial electret speaker, comprising:
a first speaker module driven by an audio signal to generate a low frequency range sound;
the first fixing frame is used for fixing the first loudspeaker module;
a second speaker module driven by the audio signal to generate a middle-high frequency range sound; and
and the second fixing frame is arranged between the first loudspeaker module and the second loudspeaker module and used for fixing the second loudspeaker module and enabling the second loudspeaker module and the first loudspeaker module to be positioned on the same axis, wherein the first fixing frame and the second fixing frame form a synchronous vibration cavity module.
2. The coaxial electret speaker of claim 1, further comprising a crossover driving module mounted on the first and second mounts, electrically connected to the first and second speaker modules, respectively, and configured to generate the audio signal.
3. The coaxial electret speaker of claim 2, wherein the crossover driving module is fastened to the first and second fastening frames by at least one screw.
4. The coaxial electret speaker of claim 1 wherein the first speaker module is a moving coil speaker and the second speaker module is an electret speaker.
5. The coaxial electret speaker of claim 1 wherein the second speaker module has an external shape that is rectangular, circular, elliptical, triangular, polygonal, irregular, or any shape.
6. The electret speaker of claim 1, wherein the second holder has a recess corresponding to the shape of the second speaker module to receive and hold the second speaker module.
7. The coaxial electret speaker of claim 1, further comprising a dust screen coupled to the second fixing frame to fix the second speaker module, wherein the dust screen has a plurality of through holes on a surface thereof to serve as sound radiation outlets of the second speaker module.
8. The coaxial electret speaker of claim 1, wherein the second fixing frame has a sound outlet hole at upper and lower sides thereof, respectively, as a sound radiation outlet of the first speaker module.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW109216519U TWM610874U (en) | 2020-12-14 | 2020-12-14 | Coaxial electret loudspeaker |
| TW109216519 | 2020-12-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114630253A true CN114630253A (en) | 2022-06-14 |
Family
ID=76606233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111412415.6A Pending CN114630253A (en) | 2020-12-14 | 2021-11-25 | Coaxial electret loudspeaker |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN114630253A (en) |
| TW (1) | TWM610874U (en) |
Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US3943304A (en) * | 1973-06-19 | 1976-03-09 | Akg Akustische U Kino-Gerate Gesellschaft M.B.H. | Headphone operating on the two-way system |
| US4447678A (en) * | 1980-07-28 | 1984-05-08 | Akg Akustische U.Kino-Gerate Gesellschaft Mbh | Electracoustic transducer |
| US4590333A (en) * | 1984-06-14 | 1986-05-20 | John Strohbeen | Multidriver loudspeaker |
| CN1886005A (en) * | 2005-06-21 | 2006-12-27 | 中山市惠威电器有限公司 | Belt type coaxial middle/high frequency loudspeaker |
| US20080192962A1 (en) * | 2007-02-13 | 2008-08-14 | Sonion Nederland B.V. | Microphone with dual transducers |
| CN101346015A (en) * | 2007-07-12 | 2009-01-14 | 财团法人工业技术研究院 | Electrostatic electroacoustic transducers |
| TW201129113A (en) * | 2010-02-01 | 2011-08-16 | Ind Tech Res Inst | Flat speaker unit and speaker device therewith |
| CN202565461U (en) * | 2012-03-09 | 2012-11-28 | 台湾驻极体电子股份有限公司 | Circumaural headset having electret loudspeakers |
| CN103716740A (en) * | 2012-09-28 | 2014-04-09 | 富佑鸿科技股份有限公司 | Loudspeaker device |
| US20150281850A1 (en) * | 2014-03-28 | 2015-10-01 | Verisonix Corporation | Hybrid electrostatic headphone module |
| US20160192083A1 (en) * | 2014-09-26 | 2016-06-30 | Amazing Microelectronic Corp. | Splicing type electret loudspeaker |
| US20170142520A1 (en) * | 2014-08-17 | 2017-05-18 | Verisonix Corporation | Hybrid electrostatic headphone module |
| CN107079217A (en) * | 2014-09-19 | 2017-08-18 | 杜比实验室特许公司 | Loudspeaker with narrow decentralization |
| CN107615781A (en) * | 2015-05-14 | 2018-01-19 | 尤金尼·博古斯拉夫斯基 | Loudspeaker |
| US20190306631A1 (en) * | 2018-03-27 | 2019-10-03 | Sony Corporation | Loudspeaker system |
| US20200196067A1 (en) * | 2017-04-21 | 2020-06-18 | USound GmbH | Loudspeaker unit comprising an electrodynamic loudspeaker and a mems loudspeaker |
| CN214045996U (en) * | 2020-12-16 | 2021-08-24 | 茂宇科技股份有限公司 | Coaxial electret loudspeaker |
-
2020
- 2020-12-14 TW TW109216519U patent/TWM610874U/en unknown
-
2021
- 2021-11-25 CN CN202111412415.6A patent/CN114630253A/en active Pending
Patent Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3943304A (en) * | 1973-06-19 | 1976-03-09 | Akg Akustische U Kino-Gerate Gesellschaft M.B.H. | Headphone operating on the two-way system |
| US4447678A (en) * | 1980-07-28 | 1984-05-08 | Akg Akustische U.Kino-Gerate Gesellschaft Mbh | Electracoustic transducer |
| US4590333A (en) * | 1984-06-14 | 1986-05-20 | John Strohbeen | Multidriver loudspeaker |
| CN1886005A (en) * | 2005-06-21 | 2006-12-27 | 中山市惠威电器有限公司 | Belt type coaxial middle/high frequency loudspeaker |
| US20080192962A1 (en) * | 2007-02-13 | 2008-08-14 | Sonion Nederland B.V. | Microphone with dual transducers |
| CN101346015A (en) * | 2007-07-12 | 2009-01-14 | 财团法人工业技术研究院 | Electrostatic electroacoustic transducers |
| TW201129113A (en) * | 2010-02-01 | 2011-08-16 | Ind Tech Res Inst | Flat speaker unit and speaker device therewith |
| CN202565461U (en) * | 2012-03-09 | 2012-11-28 | 台湾驻极体电子股份有限公司 | Circumaural headset having electret loudspeakers |
| CN103716740A (en) * | 2012-09-28 | 2014-04-09 | 富佑鸿科技股份有限公司 | Loudspeaker device |
| US20150281850A1 (en) * | 2014-03-28 | 2015-10-01 | Verisonix Corporation | Hybrid electrostatic headphone module |
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| CN107615781A (en) * | 2015-05-14 | 2018-01-19 | 尤金尼·博古斯拉夫斯基 | Loudspeaker |
| US20200196067A1 (en) * | 2017-04-21 | 2020-06-18 | USound GmbH | Loudspeaker unit comprising an electrodynamic loudspeaker and a mems loudspeaker |
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| CN214045996U (en) * | 2020-12-16 | 2021-08-24 | 茂宇科技股份有限公司 | Coaxial electret loudspeaker |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM610874U (en) | 2021-04-21 |
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