CN106792390B - Flat membrane sound production device - Google Patents
Flat membrane sound production device Download PDFInfo
- Publication number
- CN106792390B CN106792390B CN201611235965.4A CN201611235965A CN106792390B CN 106792390 B CN106792390 B CN 106792390B CN 201611235965 A CN201611235965 A CN 201611235965A CN 106792390 B CN106792390 B CN 106792390B
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- flat
- wire
- generating device
- sound generating
- switching section
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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
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—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
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
Abstract
The invention discloses a flat film sound producing device, which comprises: a flat vibrating diaphragm; the voice coil wire layer is arranged on the surface of one side of the flat vibrating diaphragm and is formed by arranging a plurality of concentrically arranged wire rings, the radius of each wire ring is different, two adjacent wire rings are connected by a radius switching section, the wire rings are sequentially connected in series according to the sequence of decreasing radius, the radius switching section at least comprises a direction switching section, and when current is introduced into the voice coil wire layer, the direction switching section enables the current direction in the two adjacent wire rings to be reversed; the magnet assembly at least comprises two annular magnets which are arranged concentrically, the number of the annular magnets is 1 larger than that of the direction switching sections, the annular magnets are coaxial with the wire circular ring, the position of the direction switching section corresponds to the position of a gap between every two adjacent annular magnets, and the magnetic poles of the adjacent two annular magnets at the position of the gap between the two adjacent annular magnets are the same.
Description
Technical Field
The invention belongs to the technical field of sound generating devices, and particularly relates to a flat film sound generating device.
Background
The flat diaphragm loudspeaker combines the voice coil and diaphragm of the loudspeaker into a whole, the voice coil wire is made of thin metal conductor and is flatly spread on the plane of the vibrating diaphragm, the magnetic circuit part is parallel magnet distributed on one side or two sides of the plane voice diaphragm, when a current signal is input to the flat membrane coil, the flat membrane is driven to vibrate in a gap at one side or in the middle of the magnet through electromagnetic stress, and therefore sound is produced. The flat-film loudspeaker vibration system is very light in weight, good in transient response, high in product heat dissipation efficiency, good in power resistance and the like.
The coil 02 of the conventional flat-film speaker 01 is distributed as shown in fig. 1, the coil 02 is arranged like an "M" shape, a main portion of the coil 02 extends along a straight line, and a bent portion is provided at an end of the coil. The flat diaphragm is matched with a strip magnet, a plurality of strip magnets are arranged in the loudspeaker at equal intervals, and the extending direction of the strip magnets is parallel to a line segment extending along a straight line on the coil 02. The average magnetic flux density of the flat diaphragm is not high, the coil 02 is provided with a bending area, and a part of the bending area is distributed outside the effective magnetic field of the magnet and does not contribute to the generation of acting force; <xnotran> , , , , . </xnotran> Therefore, the conventional flat-film speaker receives a small driving force and radiates a low sound pressure.
Therefore, there is a need to improve the wiring method of the coil on the flat diaphragm or improve the magnetic circuit structure in the flat mode speaker to improve the utilization rate of the coil.
Disclosure of Invention
The invention aims to provide a novel technical scheme of a flat film sound production device.
According to a first aspect of the present invention, there is provided a flat film sound generating device comprising:
a flat vibrating diaphragm;
the voice coil wire layer is arranged on the surface of one side of the flat vibrating diaphragm and is formed by arranging a plurality of concentrically arranged wire rings, the radius of each wire ring is different, two adjacent wire rings are connected by a radius switching section, the wire rings are sequentially connected in series according to the order of decreasing radius, the radius switching section at least comprises a direction switching section, and when current is introduced into the voice coil wire layer, the direction switching section enables the current direction in the two adjacent wire rings to be reversed;
the magnet assembly at least comprises two annular magnets which are arranged concentrically, the number of the annular magnets is 1 larger than that of the direction switching sections, the magnet assembly is positioned on one side of the flat vibrating diaphragm, the annular magnets are coaxial with the wire circular ring, the position of the direction switching section corresponds to the position of a gap between every two adjacent annular magnets, and the magnetic poles of the adjacent two annular magnets at the position of the gap between the adjacent two annular magnets are the same;
a sound generator housing configured to carry the ring magnet and the flat diaphragm.
Alternatively, the voice coil wire layer is provided with two direction switching sections, the magnet assembly includes three concentrically arranged ring magnets.
Optionally, the distance between two adjacent wire rings is greater than 0.3mm.
Optionally, the flat membrane sound generating device comprises two sets of the magnet assemblies, and the two sets of the magnets are respectively arranged on two sides of the flat membrane.
Optionally, the flat membrane sound generating mechanism includes circular magnetic conductive plate, circular magnetic conductive plate fixes in the sound generating mechanism casing, the magnet subassembly is fixed to be set up on the circular magnetic conductive plate, the circular magnetic conductive plate is last to have the sound transmission hole, the sound transmission hole with clearance position between the ring magnet is corresponding.
Optionally, the edge of the flat diaphragm has a first signal connection point and a second signal connection point, the wire loop with the largest radius is electrically connected to the first signal connection point, and the wire loop with the smallest radius or the wire at the center of the voice coil wire layer is electrically connected to the second signal connection point.
Optionally, the flat diaphragm is circular, the edge of the flat diaphragm is provided with an annular reinforcing rib, the edge of the flat vibrating diaphragm is fixed on the shell of the sound generating device.
Optionally, a reinforcing ring is disposed in the voice coil wire layer, the reinforcing ring is located between two wire rings connected to the direction switching section, and separates the two wire rings, a gap is formed in the reinforcing ring, and the direction switching section is located at the gap.
Optionally, the sound generating device shell includes a front shell and a rear shell, the circular magnetic conductive plate is fixedly arranged on the rear shell, a rear sound hole is formed in the rear shell, a tuning mesh fabric covers the outer surface of the rear shell, the tuning mesh fabric covers the rear sound hole, the front shell is buckled on the rear shell, and the flat diaphragm is close to the front shell.
Optionally, two soldering lugs are arranged on the shell of the sound generating device, and the two soldering lugs are electrically connected with the first signal connecting point and the second signal connecting point respectively.
One technical effect of the present invention is to improve the utilization of a voice coil by improving the structure of the voice coil and a magnet assembly.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
<xnotran> 1 ; </xnotran>
<xnotran> 2 ; </xnotran>
<xnotran> 3 ; </xnotran>
FIG. 4 is a schematic structural diagram of a magnet assembly in the flat film sound generating device provided by the present invention;
FIG. 5 is the magnetic circuit assembly and flat a schematic side sectional view of a diaphragm;
<xnotran> 6 ; </xnotran>
Fig. 7 is a schematic structural diagram of a rear shell of the flat film sound generating device provided by the invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be discussed further in subsequent figures.
The invention provides a flat membrane sound production device which comprises a flat vibrating membrane 1, a voice coil wire layer 2, a magnet assembly and a sound production device shell, and is shown in figure 2. The sound generating device shell is used for bearing the annular magnet 31 and the flat vibrating diaphragm 1, the flat vibrating diaphragm 1 and the magnet assembly are arranged in the sound generating device shell, and the flat vibrating diaphragm 1 is opposite to the magnet assembly. The voice coil wire layer 2 is arranged on the flat vibrating diaphragm 1, and when the voice coil wire layer 2 is fed with current of voice signals, the voice coil wire layer 2 is stressed to drive the flat vibrating diaphragm 1 to vibrate.
Specifically, as shown in fig. 3, the voice coil wire layer 2 is formed by arranging a plurality of concentrically arranged wire rings 21, and the radius of each wire ring 21 is different. Two adjacent wire rings 21 are connected by a radius switching section 22, as shown in fig. 3. The lead circular rings 21 are sequentially connected in series according to the decreasing order of the radius, and all the lead circular rings 21 are connected in series from outside to inside to form a circuit path. In particular, the radius switching section 22 further includes at least one direction switching section 221, and the direction switching section 221 functions to connect the wire rings 21 with different radii and also functions to change the surrounding direction of the wire ring 21. When a signal current is applied to the voice coil wire layer 2, the direction switching section 221 reverses the direction of the current in the adjacent two wire rings 21.
Taking the flat diaphragm 1 shown in fig. 3 as an example, the outermost wire ring 21 is connected to the inner adjacent wire ring 21 through the radius switching section 22 after being clockwise looped for one circle, and the inner wire ring 21 is also connected to the inner adjacent wire ring 21 through the radius switching section 22 after being clockwise looped for one circle. The third wire ring 21 is connected to the inner fourth wire ring 21 through the direction switching section 221 after being wound clockwise for one turn, and the fourth wire ring 21 is connected to the inner wire ring 21 through the radius switching section 22 after being wound counterclockwise for one turn. It can be seen that the surrounding directions of the two adjacent wire loops 21 connected by the direction switching section 221 are opposite. This structure makes the signal current passing through the voice coil wire layer 2 flow in opposite directions in the wire rings 21 on both sides of the direction switching section 221, and the winding direction is reversed by 180 degrees.
The magnet assembly includes at least two ring magnets 31 concentrically arranged, and the number of the ring magnets 31 is 1 greater than that of the direction switching segments 221. Taking the embodiment shown in fig. 2-5 as an example, when the voice coil wire layer 2 is provided with the two-end direction switching section 221, the magnet assembly includes three ring magnets 31, and the three ring magnets 31 are concentrically arranged. The magnet assembly is positioned on one side of the flat diaphragm 1 and is arranged substantially parallel to the flat diaphragm 1, and the ring magnet 31 and the wire ring 21 are positioned coaxially relative to each other. The position of the direction switching segment 221 corresponds to the position of the gap between two adjacent ring magnets 31. Thus, each time the direction of the wire loop 21 is switched, the ring magnet 31 corresponding to the wire loop 21 is different. Further, as shown in fig. 5, the magnetic poles of two adjacent ring magnets 31 at the gap therebetween are the same.
The invention optimizes the wire arrangement of the voice coil wire layer and the magnetic circuit assembly, and improves the wire length utilization rate by utilizing a plurality of annular magnets and a plurality of wire circular rings connected in series. As shown in fig. 4 and 5, the wire rings 21 are concentrically arranged, and the magnetic induction lines are more constricted at the upper and lower sides of the ring magnet 31 toward the adjacent same magnetic poles, so as to improve the parallelism between the magnetic induction lines and the plane where the flat diaphragm 1 is located. Thus, the entire area of the wire loop 21 is substantially perpendicular to the direction of the magnetic induction line, and the tangential direction of the current in the wire loop 21 is always perpendicular to the magnetic induction line direction. According to the left-hand rule, all the wire lengths on the wire circular ring contribute to generating Loran magnetic force, and the utilization rate of the magnetic field and the effective wire length of the voice coil wire layer are greatly improved. Only the area of the radius switching segment 22 has a tendency to be parallel to the magnetic induction line, with a relatively low utilization. The utilization rate of all the wire lengths of the voice coil wire layer 2 can be improved to more than 95%. The direction switching section 221 reverses the direction of the signal current by 180 degrees at the gap of the ring magnet 31, so that the direction of the lorentz force applied to the voice coil wire layer 2 is the same.
Further, when the efficiency of the voice coil wire layer 2 for acquiring the lorentn magnetic force is improved, the flat diaphragm 1 can generate a larger amplitude during vibration, and the sound pressure of the sound generating device and the volume of the generated sound are improved.
The number of the direction switching sections is not limited by the present invention, and the skilled person can adjust the number of the direction switching sections accordingly according to the number of the ring magnets included in the magnet assembly. In the case of a large number of ring magnets, for example 3-4, the effect between the opposing poles will increase the field convergence and increase the field utilization. In order to align the lorentz forces acting on the voice coil wire layer 2, the voice coil wire layer 2 should be provided with corresponding direction switching sections 221 at the gaps between adjacent ring magnets 31.
Alternatively, the distance between two adjacent wire rings 21 may be greater than 0.3mm. The adjacent wire circular rings keep a proper distance, so that the mutual influence of currents in the wire circular rings can be reduced, and the reliability of the flat film sound production device is improved. On the contrary, the space between the wire rings is too large, which causes a decrease in space efficiency on the flat diaphragm. The skilled person can design the spacing between the wire rings according to the performance requirements of the actual product.
Optionally, in some embodiments, the flat film sound generating device may also include two sets of the above-mentioned magnet assemblies. Fig. 2 to 5 show embodiments in which there is only one set of magnet assemblies, said magnet assemblies being located on one side of the flat diaphragm 1. In the flat membrane sound generating device having two sets of magnet assemblies, the ring magnets 31 included in the two sets of magnet assemblies are the same, and the two sets of magnet assemblies are respectively located on both sides of the flat membrane 1. In this embodiment, the voice coil wire layer 2 can obtain a stronger lorentz force, and the flat diaphragm 1 can generate a larger vibration amplitude and a larger sound pressure.
Optionally, the flat film sound generating device may further include a circular magnetic conductive plate 5, as shown in fig. 2. The circular magnetic conduction plate 5 is used for adjusting and converging the magnetic field of the magnet assembly, and the utilization rate of the magnetic field is improved. Circular magnetic conduction board 5 can be fixed the sound generating mechanism casing, the fixed setting of magnet subassembly is in on the circular magnetic conduction board 5, modes such as bonding fixed can be adopted. The circular magnetic conducting plate 5 is provided with sound transmission holes 51, and as shown in fig. 2, the positions of the sound transmission holes 51 correspond to the positions of the gaps between the ring magnets 31. The sound generated by the vibration of the flat diaphragm 1 can be transmitted to the outside of the sound generating apparatus housing through the sound transmission hole 51. The edge of the circular magnetic conduction plate 5 can also be provided with an outer convex rib position, and the outer convex rib position is used for clamping and fixing the circular magnetic conduction plate 5 on the shell of the sound generating device.
Alternatively, as shown in fig. 3 and 6, the flat diaphragm 1 may have a first signal connection point 11 and a second signal connection point 12, and the two connection points may be located at the edge of the flat diaphragm 1. The first signal connection point 11 and the second signal connection point 12 are used for electrically connecting with external electronic equipment, so that signals can be introduced into the voice coil wire layer 2 to form a signal loop. The wire loop 21 with the largest radius is electrically connected to the first signal connection point 11, as shown in fig. 3, and the wire loop 21 with the smallest radius or the wire located at the center of the voice coil wire layer 2 is electrically connected to the second signal connection point 12, as shown in fig. 6.
Optionally, the flat diaphragm 1 is circular as a whole, and the edge of the flat diaphragm 1 is provided with an annular reinforcing rib 13. The annular reinforcing rib 13 is used for reinforcing the whole structure of the flat diaphragm 1 and preventing the flat diaphragm 1 from deforming during vibration and assembly. The edge of the flat diaphragm 1 can be fixed on the sound-generating device shell. In other embodiments, the flat diaphragm may also be provided with a reinforcing rib in other structural forms, which is not limited by the present invention.
In particular, the voice coil wire layer 2 may be provided with a reinforcing ring 23, as shown in fig. 3, the reinforcing ring 23 is located between two wire rings 21 connected by a direction switching section 221, and the reinforcing ring 23 separates the two wire rings 21 with opposite winding directions. The reinforcing ring 23 may have a notch so that the direction switching section 221 connects the two wire rings 21 from the notch. The reinforcing ring 23 supports and reinforces the flat vibrating diaphragm 1, so that the overall strength of the flat vibrating diaphragm 1 is improved, and the flat vibrating diaphragm is prevented from generating large deformation when vibrating.
Alternatively, as shown in fig. 2 and 7, the sound generating device housing may include a front shell 31 and a rear shell 32, the circular magnetic conductive plate 5 is fixedly disposed on the rear shell 32, and the rear shell 32 may be provided with a rear sound hole 321 so that sound can be transmitted therethrough. As shown in fig. 7, a step structure 323 may be disposed on the rear shell 32, where the step structure is used to match with an outer protruding rib position on the circular magnetic conductive plate 5, and the outer protruding rib position may be fixed on the step structure 323 in a clamping manner, so that the circular magnetic conductive plate 5 is fixedly connected to the rear shell 32. As shown in fig. 2, the outer surface of the rear shell 32 may also be covered with a tuning mesh 6, and the tuning mesh 6 covers the rear sound hole 321. The front case 31 is fastened to the rear case 32 to form an accommodating space for supporting the flat diaphragm 1 and the magnet assembly. The flat diaphragm 1 may be close to the front shell 31, and the front shell may also be provided with a hole structure for sound emission, which is not limited in the present invention.
Optionally, in order to facilitate the electrical connection of the voice coil lead layer 2 with an external device to form a signal loop, two soldering pads 7 may be disposed on the casing of the sound generating device, and the two soldering pads 7 are electrically connected to the first signal connection point 11 and the second signal connection point 12, respectively. The voice coil wire layer 2 can be connected to the soldering lug 7 through the first and second signal connection points, and when the flat film sound generating device is assembled or fixed on an external electronic device, the soldering lug 7 can be electrically connected with the external electronic device. As shown in fig. 7, the rear case 32 may have a slot 322, and the soldering lug 7 may be fixedly disposed in the slot. The invention is not limited to the fixing mode of the soldering lug, and in other embodiments, a person skilled in the art may also fix the soldering lug in a form of integral injection molding of the soldering lug and the rear shell.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. A flat film sound generating device, comprising:
a flat diaphragm (1);
the voice coil conducting wire layer (2) is arranged on the surface of one side of the flat vibrating diaphragm (1), the voice coil conducting wire layer (2) is formed by arranging a plurality of conducting wire circular rings (21) which are concentrically arranged, the radius of each conducting wire circular ring (21) is different, two adjacent conducting wire circular rings (21) are connected through a radius switching section (22), the conducting wire circular rings (21) are sequentially connected in series according to the decreasing order of the radius, the radius switching section (22) at least comprises a section of direction switching section (221), and when current is introduced into the voice coil conducting wire layer (2), the direction switching section (221) enables the current direction in the two adjacent conducting wire circular rings (21) to be reversed;
the magnet assembly at least comprises two annular magnets (31) which are arranged concentrically, the number of the annular magnets (31) is 1 more than that of direction switching sections (221), the magnet assembly is positioned on one side of the flat vibrating diaphragm (1), the annular magnets (31) are coaxial with the wire circular ring (21), the position of each direction switching section (221) corresponds to the position of a gap between every two adjacent annular magnets (31), and the magnetic poles of the gaps between every two adjacent annular magnets (31) are the same;
a sound-emitting device housing configured for carrying the ring magnet (31) and the flat diaphragm (1).
2. The flat film sound generating device according to claim 1, wherein the voice coil wire layer (2) has two direction switching sections (221), and the magnet assembly comprises three concentrically arranged ring magnets (31).
3. The flat film sound generating device according to claim 1, wherein the distance between two adjacent wire rings (21) is greater than 0.3mm.
4. The flat membrane sound generating device according to claim 1, wherein the flat membrane sound generating device comprises two sets of the magnet assemblies, and the two sets of the magnets are respectively arranged on two sides of the flat diaphragm (1).
5. The flat membrane sound production device according to claim 1, wherein the flat membrane sound production device comprises a circular magnetic conductive plate (5), the circular magnetic conductive plate (5) is fixed in the sound production device shell, the magnet assembly is fixedly arranged on the circular magnetic conductive plate (5), the circular magnetic conductive plate (5) is provided with a sound transmission hole (51), and the sound transmission hole (51) corresponds to the gap position between the annular magnets (31).
6. The flat membrane sound generating device according to claim 1, wherein the edge of the flat diaphragm (1) has a first signal connection point (11) and a second signal connection point (12), the wire loop (21) with the largest radius is electrically connected to the first signal connection point (11), and the wire loop (21) with the smallest radius or the wire at the center of the voice coil wire layer (2) is electrically connected to the second signal connection point (12).
7. The flat membrane sound generating device according to claim 1, wherein the flat diaphragm (1) is circular, the edge of the flat diaphragm (1) has an annular reinforcing rib (13), and the edge of the flat diaphragm (1) is fixed on the sound generating device shell.
8. The flat film sound generating device according to claim 1, wherein a reinforcing ring (23) is disposed in the voice coil wire layer (2), the reinforcing ring (23) is located between two wire rings (21) connected by the direction switching section (221) to separate the two wire rings (21), the reinforcing ring (23) has a notch, and the direction switching section (221) is located at the notch.
9. The flat membrane sound generating device according to claim 5, wherein the sound generating device shell comprises a front shell (31) and a rear shell (32), the circular magnetic conductive plate (5) is fixedly arranged on the rear shell (32), a rear sound hole (321) is formed in the rear shell (32), a tuning mesh (6) covers the outer surface of the rear shell (32), the tuning mesh (6) covers the rear sound hole (321), the front shell (31) is buckled on the rear shell (32), and the flat membrane (1) is close to the front shell (31).
10. The flat membrane sound generating device according to claim 6, wherein two soldering lugs (7) are provided on the sound generating device housing, and the two soldering lugs (7) are electrically connected to the first signal connection point (11) and the second signal connection point (12), respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611235965.4A CN106792390B (en) | 2016-12-28 | 2016-12-28 | Flat membrane sound production device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611235965.4A CN106792390B (en) | 2016-12-28 | 2016-12-28 | Flat membrane sound production device |
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| CN106792390A CN106792390A (en) | 2017-05-31 |
| CN106792390B true CN106792390B (en) | 2022-10-14 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107360511A (en) * | 2017-07-03 | 2017-11-17 | 深圳市吉瑞德隆电子科技有限公司 | Curved surface vibrating diaphragm loudspeaker and sound-producing device |
| CN107580285A (en) * | 2017-09-18 | 2018-01-12 | 东莞市赞歌声学科技有限公司 | A kind of mobile phone ultrathin loudspeaker |
| CN107645698B (en) * | 2017-10-10 | 2020-11-24 | 歌尔股份有限公司 | Diaphragm material for diaphragm of sound production device and diaphragm |
| WO2019104898A1 (en) * | 2017-11-30 | 2019-06-06 | 深圳市吉瑞德隆电子科技有限公司 | Planar diaphragm horn |
| CN109511061B (en) * | 2018-12-27 | 2024-04-05 | 歌尔股份有限公司 | Miniature sound generating device and electronic product |
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| CN201213315Y (en) * | 2008-03-10 | 2009-03-25 | 中山市惠威电器有限公司 | Belt type high frequency loudspeaker |
| TW201116076A (en) * | 2009-10-23 | 2011-05-01 | Kingstate Electronics Corp | Flat voice coil speaker |
| CN105282663A (en) * | 2015-11-23 | 2016-01-27 | 许扬 | Flat and moving-coil combined-type vibrating diaphragm assembly |
| CN206413185U (en) * | 2016-12-28 | 2017-08-15 | 歌尔科技有限公司 | Flat film sound-producing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201213315Y (en) * | 2008-03-10 | 2009-03-25 | 中山市惠威电器有限公司 | Belt type high frequency loudspeaker |
| TW201116076A (en) * | 2009-10-23 | 2011-05-01 | Kingstate Electronics Corp | Flat voice coil speaker |
| CN105282663A (en) * | 2015-11-23 | 2016-01-27 | 许扬 | Flat and moving-coil combined-type vibrating diaphragm assembly |
| CN206413185U (en) * | 2016-12-28 | 2017-08-15 | 歌尔科技有限公司 | Flat film sound-producing device |
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