CN212435922U - A full-band high-quality electronic product speaker with sound beam and sound tunnel - Google Patents
A full-band high-quality electronic product speaker with sound beam and sound tunnel Download PDFInfo
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- CN212435922U CN212435922U CN202021739366.8U CN202021739366U CN212435922U CN 212435922 U CN212435922 U CN 212435922U CN 202021739366 U CN202021739366 U CN 202021739366U CN 212435922 U CN212435922 U CN 212435922U
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- 230000000149 penetrating effect Effects 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
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- 230000001755 vocal effect Effects 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
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Abstract
一种带音梁及音隧的全频段高音质电子产品扬声器，包括音圈、金属板、振膜及导磁结构；振膜呈环状，其外缘结合于扬声器外框，内缘结合于金属板外周部，金属板的中部对应音圈上端设置；振膜上设有桥式音梁，音梁呈环状架设于振膜内缘处上表面，并在扬声器的水平方向上位于金属板外侧；振膜上表面上设有四条沟槽，将位于桥式音梁外侧的振膜表面等分成四块共振区；各沟槽均横穿桥式音梁，沟槽凹设于振膜的上表面形成音隧。本实用新型将振膜由自由振动模式改变为规范振动模式，从振动、共鸣、发声的角度解决了电子产品扬声器高音区亮不出来，低音区浑厚圆润不够的问题，实践证明该改进方案具有突出的实质性特点和显著的技术进步，并且获得了明显的技术效果。
A full-band high-quality electronic product speaker with sound beam and sound tunnel, comprising a voice coil, a metal plate, a vibrating membrane and a magnetic conducting structure; On the outer periphery, the middle part of the metal plate corresponds to the upper end of the voice coil; the diaphragm is provided with a bridge sound beam, the sound beam is annularly erected on the upper surface of the inner edge of the diaphragm, and is located outside the metal plate in the horizontal direction of the speaker; the diaphragm; There are four grooves on the upper surface, which divide the surface of the diaphragm on the outside of the bridge sound beam into four equal resonance areas; each groove traverses the bridge sound beam, and the grooves are recessed on the upper surface of the diaphragm to form sound tunnel. The utility model changes the diaphragm from the free vibration mode to the standard vibration mode, and solves the problems that the high-pitched area of the loudspeaker of electronic products cannot be bright and the low-pitched area is not thick and round enough from the perspective of vibration, resonance and sound production. Practice has proved that the improved scheme has outstanding Substantial features and significant technological progress, and obtained obvious technical effects.
Description
Technical Field
The utility model relates to a speaker, concretely relates to full frequency channel high tone quality electronic product speaker of voiced sound roof beam and sound tunnel, this electronic product speaker can be applied to in the electronic products such as earphone, headset, cell-phone, panel computer, notebook computer.
Background
A speaker (also called a loudspeaker) is a device for converting an electrical signal into an acoustic signal, as shown in fig. 1 and 2, a conventional electronic product speaker generally comprises a voice coil 1, a metal plate 2, a diaphragm 3, and a magnet and a magnetic conductive structure (not shown). When the loudspeaker works, currents with different magnitudes are output by the amplifier, converted into sound waves through frequency waves, the output energy is improved through power pushing, the voice coil 1 moves under the action of a magnetic field, meanwhile, the voice coil 1 is connected to the vibrating diaphragm 3 and drives the vibrating diaphragm 3 to vibrate, and then air is pushed through the vibration of the vibrating diaphragm 3, so that sound is produced.
The conventional electronic product loudspeaker has the following common problems: the loudspeaker has a natural resonant frequency when sounding, and after exceeding a certain range of a resonant frequency area, a high pitch area is not bright, and a low pitch area is not perfectly round. Bass must be realized through a special woofer, and treble must be realized through a special tweeter, that is, the tone is proportional to the number of loudspeakers, and the full-band quality tone cannot be realized through a single loudspeaker. The reason for this is that the conventional loudspeaker diaphragm cannot satisfy a good wide-band vibration from a high-pitch region to a low-pitch region, i.e., cannot simultaneously adapt to wide frequency variation resonance and vibration in the high-pitch region, the middle-pitch region and the low-pitch region. In conclusion, the conventional electronic product loudspeaker is unreasonable in structural design and is not favorable for the diaphragm to perform good sound wave vibration from a high-pitch area to a low-pitch area. If the realization is appreciated level tone quality performance, then need the speaker of a plurality of different frequency channels to make up, and price is higher usually like this, is unfavorable for widening the market, and the volume is great usually in addition, needs more to place the space, is unfavorable for the frivolousization of electronic product.
Therefore, how to solve the above-mentioned deficiencies of the prior art is a problem to be solved by the present invention.
Disclosure of Invention
The utility model aims at providing a take full frequency channel high tone quality electronic product speaker of sound roof beam and sound tunnel.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
a full-band high-sound-quality electronic product loudspeaker with a sound beam and a sound tunnel comprises a voice coil, a metal plate, a vibrating diaphragm and a magnetic conduction structure; the vibrating diaphragm is annular, the outer edge of the vibrating diaphragm is combined with the outer frame of the loudspeaker, the inner edge of the vibrating diaphragm is combined with the outer periphery of the metal plate, and the middle of the metal plate is arranged corresponding to the upper end of the voice coil;
the vibrating diaphragm is provided with a bridge type sound beam which is annular, is erected on the upper surface of the inner edge of the vibrating diaphragm and is positioned on the outer side of the metal plate in the horizontal direction of the loudspeaker;
four grooves are formed in the upper surface of the vibrating diaphragm, extension lines of the grooves intersect at the center of the vibrating diaphragm in the horizontal direction, and two adjacent grooves are arranged at an angle of 90 degrees; equally dividing the surface of the vibrating diaphragm positioned on the outer side of the bridge type sound beam into four resonance areas through the grooves; each groove transversely penetrates through the bridge type sound beam in the horizontal direction of the loudspeaker and is vertical to the bridge type sound beam in the length direction of the groove;
the groove is concavely arranged on the upper surface of the vibrating diaphragm to form a sound tunnel.
The relevant content in the above technical solution is explained as follows:
1. in the above scheme, the bridge type sound beam is located on the outer side of the metal plate in the horizontal direction of the loudspeaker, so that the bridge type sound beam and the voice coil are separated by a certain distance, and the sound production vibration of the voice coil can be gathered.
2. In the above scheme, the extension lines of the grooves intersect at the center of the horizontal direction of the diaphragm, and two adjacent grooves are arranged at 90 degrees, which is helpful for rapidly transmitting the vibration of the voice coil to the periphery of the diaphragm through the cross-shaped voice tunnel (namely, the voice tunnel) formed by the grooves.
3. In the scheme, the vibrating diaphragm is divided into a high-sound area at the outer section, a middle-sound area at the middle section and a low-sound area at the inner section from a sound-producing frequency band; the wall thickness of the diaphragm is gradually increased from outside to inside, the wall thickness of a low-sound area is larger than that of a middle-sound area, and the wall thickness of the middle-sound area is larger than that of a high-sound area; the bridge type sound beam is located in the bass region.
By the design, the thicker bass region is arranged at a position close to the voice coil, so that low-frequency vibration with lower frequency and larger amplitude can generate more muddy and mellow bass in the bass region of the vibrating diaphragm; through setting up thinner high pitch region in the position of keeping away from the voice coil loudspeaker voice coil, can make the frequency higher, the less high-frequency vibration of amplitude send more penetrating, bright high pitch in the high pitch region of vibrating diaphragm, and then make the speaker all obtain effectively promoting at tone quality, the tone quality that full frequency channel produced.
4. In the above scheme, the bottom of the bridge type sound beam is provided with the bridge opening, the bridge opening penetrates in the width direction of the bridge type sound beam, and the opening below the bridge opening corresponds to the groove.
Borrow this design, through establishing the sound beam on the sound tunnel more be favorable to transmitting the vibration through the sound tunnel to more be favorable to promoting the vibration response rate of vibrating diaphragm.
5. In the above scheme, when the diaphragm is horizontal, the center line of the bridge type sound beam in the up-down direction overlaps with the center line of the diaphragm in the up-down direction, so as to improve the tone quality and the tone color.
6. In the above scheme, each the slot is the arc wall, can be so that the vibrating diaphragm minimize thickness sudden change in thickness, influence the sympathetic response and the vibration of vibrating diaphragm.
7. In the above scheme, the length of the groove is smaller than the width of the diaphragm, and smooth transition surfaces are arranged between the two outer ends of the groove and the upper surface of the diaphragm.
8. In the above scheme, still be equipped with several recesses on the vibrating diaphragm, and each the recess is radial and arranges to this promotes the structural strength of vibrating diaphragm. The groove may be of a straight design to avoid interfering acoustic tunnels.
The utility model discloses a theory of operation and advantage as follows:
the utility model relates to a full-band high-tone quality electronic product loudspeaker with a sound beam and a sound tunnel, which comprises a voice coil, a metal plate, a vibrating diaphragm and a magnetic conduction structure; the vibrating diaphragm is annular, the outer edge of the vibrating diaphragm is combined with the outer frame of the loudspeaker, the inner edge of the vibrating diaphragm is combined with the outer periphery of the metal plate, and the middle part of the metal plate is arranged corresponding to the upper end of the voice coil; the vibrating diaphragm is provided with a bridge type sound beam which is annularly erected on the upper surface of the inner edge of the vibrating diaphragm and is positioned outside the metal plate in the horizontal direction of the loudspeaker; four grooves are formed in the upper surface of the vibrating diaphragm, and the surface of the vibrating diaphragm located on the outer side of the bridge-type sound beam is equally divided into four resonance areas; each groove transversely penetrates through the bridge type sound beam and is vertical to the bridge type sound beam in the length direction of the groove; the groove is concavely arranged on the upper surface of the vibrating diaphragm to form a sound tunnel.
Compared with the prior art, can't compromise the problem that high, well, bass district possess good sympathetic response tone simultaneously in order to solve current electronic product speaker, the utility model discloses vibrating diaphragm design in to current speaker, especially speaker has improved. The concrete aspects are as follows: firstly, erecting a bridge type sound beam on the upper surface of a vibrating diaphragm; secondly, a cross-shaped groove is formed in the upper surface of the vibrating diaphragm, and the cross-shaped groove forms a cross-shaped sound tunnel in the upper surface of the vibrating diaphragm.
The utility model discloses highlight not come out to current electronic product speaker high pitch area, and the not enough problem of low pitch area muddy and mellow, carried out deep discussion and research to the design and the vocal mechanism of speaker, found out the not good leading reason of tone quality in current speaker high pitch area and low pitch area because the unreasonable institute of vibrating diaphragm design. In view of the above, the inventor has broken the constraint that the design was constituteed to the electronic product speaker in the past, and the bold has proposed the utility model discloses an improve design, this kind of improve design changes the vibrating diaphragm into present standard vibration mode by the free vibration mode in the past, has solved the speaker high sound zone from the angle of vibration, sympathetic response, sound production and has not come out, and the low sound zone is muddy mellow and not enough problem, practice proves that this improves design has outstanding substantive characteristics and apparent technological progress to obvious technological effect has been obtained.
Because of above-mentioned technical scheme's application, the utility model discloses compare with current electronic product loudspeaker diaphragm and have following advantage and effect:
1. the utility model discloses set up bridge type sound beam structure on the upper surface of vibrating diaphragm, because the relative high pitch amplitude of bass is big, the frequency is low, the bass sympathetic response is concentrated on the central zone that the vibrating diaphragm is close to the voice coil loudspeaker voice coil, and the high pitch sympathetic response is concentrated on the edge region all around of vibrating diaphragm, strengthens vibrating diaphragm central zone intensity, has played important effect to improving bass district tone quality and tone quality. Because the thickness of the diaphragm is a thickness-gradually-changing structure (namely, the thickness is thin outside and the thickness is thick inside) with thick central area and thin periphery, the strength of the central area of the diaphragm is enhanced, the thickness difference between the central area of the diaphragm and the peripheral area is relatively changed, and the diaphragm also has a beneficial effect on improving the tone color and the tone quality of a high-pitch area.
2. The utility model discloses cross form slot has been seted up on the vibrating diaphragm upper surface, and this cross form slot actually forms cross sound tunnel on the upper surface of vibrating diaphragm, and the region that is close the voice coil loudspeaker voice coil collects the voice coil loudspeaker voice coil vibration to transmit to the edge all around of vibrating diaphragm rapidly through cross sound tunnel (the tunnel of sound promptly), this tone quality and the tone quality to improving the high voice zone have played the key role.
3. The utility model discloses design into bridge type sound roof beam structure with the sound roof beam, especially design the bridge opening (the hole lacks) in one side of sound roof beam, make the sound roof beam like bridge arch structure. When the sound beam is erected on the sound tunnel, vibration can be transmitted through the sound tunnel more conveniently, and resonance and quick vibration response of the vibrating diaphragm are facilitated.
4. The utility model discloses a design of bridge type sound roof beam and cross form slot, four resonance regions of partition on the vibrating diaphragm etc.. When the loudspeaker works, the vibration of the voice coil is transmitted to the central area of the vibrating diaphragm firstly, then transmitted to each resonance area through the sound tunnel, and resonance and vibration are generated, so that the vibration of an external sound source is amplified to be resonance sound of the vibrating diaphragm. Each resonance region can generate one sound wave quantity, and one acoustic wave quantity is added to the original sound wave quantity, so that the total quantity of the five sound waves is five. The sound wave quantity is the number of sound waves, and the sound wave quantity directly influences the tone quality, the penetrating power and the volume of the diaphragm. Therefore, the utility model relates to a can obviously improve the tone quality in high-pitched sound district and bass district, increase the penetrating power and the volume in high-pitched sound district and bass district.
5. The utility model discloses each slot all adopts the arc wall, can be so that the vibrating diaphragm minimize thickness sudden change in thickness, avoids influencing the sympathetic response and the vibration of vibrating diaphragm.
Drawings
Fig. 1 is a schematic structural diagram of a conventional loudspeaker for electronic products;
FIG. 2 is a schematic top view of a conventional speaker for electronic products;
FIG. 3 is a schematic structural diagram of an embodiment of the present invention;
fig. 4 is a schematic top view of an embodiment of the present invention.
In the above drawings: 1. a voice coil; 2. a metal plate; 3. vibrating diaphragm; 4. vibrating diaphragm; 5. a bridge-type sound beam; 6. a trench; 7. a resonance region; 8. a bridge opening; 9. and (4) a groove.
Detailed Description
The invention will be further described with reference to the following drawings and examples:
example (b): the present invention will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown and described, and in which modifications and variations can be made without departing from the spirit and scope of the invention.
As used herein, the term "connected" or "disposed" refers to two or more elements or devices being in direct physical contact with each other or in indirect physical contact with each other, and may also refer to two or more elements or devices being in operation or acting on each other.
As used herein, the terms "comprising," "including," "having," and the like are open-ended terms that mean including, but not limited to.
As used herein, the term (terms), unless otherwise indicated, shall generally have the ordinary meaning as commonly understood by one of ordinary skill in the art, in this written description and in the claims. Certain words used to describe the disclosure are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the disclosure.
The terms "upper" and "lower" used herein are used in directional terms, and are used only for explaining the positional relationship between the structures in the present invention, and are not used to limit the protection scheme and the specific direction in practical implementation of the present invention.
Referring to fig. 3 and 4, a full-band high-sound-quality speaker with a sound beam and a sound tunnel for electronic products includes a voice coil 1, a metal plate 2, a diaphragm 4, and a magnetic structure (not shown). The diaphragm 4 is ring-shaped, the outer edge of the diaphragm is combined with the outer frame of the loudspeaker, the inner edge of the diaphragm is combined with the outer periphery of the metal plate 2, and the middle of the metal plate 2 is arranged corresponding to the upper end of the voice coil 1.
The vibrating diaphragm 4 is provided with a bridge type sound beam 5, and the bridge type sound beam 5 is annular, is erected on the upper surface of the inner edge of the vibrating diaphragm 4, and is positioned on the outer side of the metal plate 2 in the horizontal direction of the loudspeaker.
Preferably, the diaphragm 4 is divided into an outer high-sound region, a middle-sound region and an inner low-sound region from the sounding frequency band; the wall thickness of the diaphragm 4 is gradually increased from outside to inside, the wall thickness of a low-sound area is larger than that of a middle-sound area, and the wall thickness of the middle-sound area is larger than that of a high-sound area; the bridge type sound beam 5 is positioned in the bass region and can improve the middle load of the vibrating diaphragm 4.
Through set up bridge type sound roof beam 5 on the upper surface at vibrating diaphragm 4, because the relative high pitch amplitude of bass is big, the frequency is low, the bass sympathetic response is concentrated on vibrating diaphragm 4 and is close to the central zone of voice coil loudspeaker voice coil 1, and the high pitch sympathetic response is concentrated on the edge region all around of vibrating diaphragm 4, strengthens vibrating diaphragm 4 central zone intensity, has played important effect to improving bass district tone and tone quality. Because the thickness of the diaphragm 4 is a thickness-gradually-changing structure (namely, a design with a thin outer part and a thick inner part) with a thick central area and thin periphery, the strength of the central area of the diaphragm 4 is enhanced, the thickness difference between the central area of the diaphragm 4 and the peripheral edge area is relatively changed, and the thickness-gradually-changing structure also has a beneficial effect on improving the tone color and the tone quality of a high-pitch area.
Four grooves 6 are arranged on the upper surface of the vibrating diaphragm 4, the extension lines of the grooves 6 are intersected at the center of the vibrating diaphragm in the horizontal direction, and two adjacent grooves 6 are arranged at an angle of 90 degrees; the surface of the diaphragm 4 positioned outside the bridge-type sound beam 5 is equally divided into four resonance areas 7 through each groove 6; each groove 6 crosses the bridge sound beam 5 in the horizontal direction of the speaker, and is perpendicular to the bridge sound beam 5 in the longitudinal direction of the groove 6.
The groove 6 is concavely arranged on the upper surface of the diaphragm 4 to form a sound tunnel.
By providing the cross-shaped groove 6 on the upper surface of the diaphragm 4, the cross-shaped groove 6 actually forms a cross-shaped sound tunnel on the upper surface of the diaphragm 4, and the region near the voice coil 1 collects the vibration of the voice coil 1, and rapidly transmits the vibration to the peripheral edge of the diaphragm 4 through the cross-shaped sound tunnel (i.e., the sound tunnel), which plays a key role in improving the tone and sound quality of the high-tone region. Meanwhile, four resonance areas 7 are equally divided on the diaphragm 4, so that vibration can be transmitted to the four resonance areas 7 through a sound tunnel and resonance is generated, and the timbres of a bass area and a treble area can be obviously improved.
The bottom of the bridge-type sound beam 5 is provided with a bridge opening 8, the bridge opening 8 is arranged in the width direction of the bridge-type sound beam 5 in a penetrating mode, and the opening below the bridge opening 8 corresponds to the groove 6. The sound beam is designed into a bridge type sound beam 5 structure, and particularly, a bridge opening 8 (opening gap) is designed at one side of the sound beam, so that the bridge type sound beam 5 is like a bridge arch structure. When the bridge-type sound beam 5 is erected on the sound tunnel 7, vibration is transmitted through the sound tunnel 7 more favorably, so that resonance and quick vibration response of the diaphragm 4 are more favorably realized.
Preferably, when the diaphragm 4 is horizontal, the center line of the bridge sound beam 5 in the up-down direction overlaps with the center line of the diaphragm 4 in the up-down direction.
Preferably, the vibrating diaphragm 4 is further provided with a plurality of grooves 9, and the grooves 9 are radially arranged, so that the structural strength of the vibrating diaphragm 4 is improved. The groove 9 may be of a straight design to avoid interference with the sound tunnel.
Each groove 6 is an arc-shaped groove, so that the thickness of the vibrating diaphragm 4 is reduced as much as possible, and resonance and vibration of the vibrating diaphragm 4 are prevented from being influenced. The length of the groove 6 is smaller than the length of the diaphragm 4 in the vertical direction, and smooth transition surfaces are arranged between the two outer ends of the groove 6 and the upper surface of the diaphragm 4.
Other embodiments and structural changes of the present invention are described below as follows:
1. in the above embodiments, the illustrated electronic product speaker is only used for illustration, the structure is not used to limit the protection scope of the present invention, and other speakers with similar structures should be covered by the protection scope of the present invention if the technical features of the present invention are adopted.
2. In the above embodiment, the bridge-type sound beam 5 is provided with the bridge opening 8, but the present invention is not limited thereto, and the bridge opening 8 may not be provided, or other structures similar to the bridge opening 8 may be provided to facilitate the transmission of the vibration through the sound tunnel, which is easily understood and accepted by those skilled in the art.
3. In the above embodiments, the number of the bridge-type sound beams 5 is not limited to one, and may be a plurality of parallel beams or other designs that help to reinforce the load in the middle of the diaphragm 4, which is easily understood and accepted by those skilled in the art.
5. In the above embodiment, the groove 6 is an arc-shaped groove. However, the present invention is not limited thereto, and the groove may be designed into other shapes, such as a V-shape, a U-shape, a W-shape, and other concave structures. As would be readily understood and accepted by those skilled in the art.
6. In the above embodiments, the material of the diaphragm 4 may be a metal material, a carbon fiber material, a composite material, or a paper material.
Compared with the prior art, can't compromise the problem that high, well, bass district possess good sympathetic response tone simultaneously in order to solve current electronic product speaker, the utility model discloses vibrating diaphragm design in to current speaker, especially speaker has improved. The concrete aspects are as follows: firstly, erecting a bridge type sound beam on the upper surface of a vibrating diaphragm; secondly, a cross-shaped groove is formed in the upper surface of the vibrating diaphragm, and the cross-shaped groove forms a cross-shaped sound tunnel in the upper surface of the vibrating diaphragm.
The utility model discloses highlight not come out to current electronic product speaker high pitch area, and the not enough problem of low pitch area muddy and mellow, carried out deep discussion and research to the design and the vocal mechanism of speaker, found out the not good leading reason of tone quality in current speaker high pitch area and low pitch area because the unreasonable institute of vibrating diaphragm design. In view of the above, the inventor has broken the constraint that the speaker constitutes the design in the past, and the bold has proposed the utility model discloses an improve design, this kind of improve design changes the vibrating diaphragm into present standard vibration mode by the free vibration mode in the past, has solved the electronics speaker high sound zone from the angle of vibration, sympathetic response, sound production and has not come out, and the low sound zone is muddy and mellow not enough problem, has improved the fidelity of each frequency channel sound, and practice proves that this improves design has outstanding substantive characteristics and apparent technological progress to obvious technological effect has been obtained.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021739366.8U CN212435922U (en) | 2020-08-19 | 2020-08-19 | A full-band high-quality electronic product speaker with sound beam and sound tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021739366.8U CN212435922U (en) | 2020-08-19 | 2020-08-19 | A full-band high-quality electronic product speaker with sound beam and sound tunnel |
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| Publication Number | Publication Date |
|---|---|
| CN212435922U true CN212435922U (en) | 2021-01-29 |
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| CN202021739366.8U Withdrawn - After Issue CN212435922U (en) | 2020-08-19 | 2020-08-19 | A full-band high-quality electronic product speaker with sound beam and sound tunnel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111954135A (en) * | 2020-08-19 | 2020-11-17 | 苏州礼乐乐器股份有限公司 | A full-band high-quality electronic product speaker with sound beam and sound tunnel |
-
2020
- 2020-08-19 CN CN202021739366.8U patent/CN212435922U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111954135A (en) * | 2020-08-19 | 2020-11-17 | 苏州礼乐乐器股份有限公司 | A full-band high-quality electronic product speaker with sound beam and sound tunnel |
| CN111954135B (en) * | 2020-08-19 | 2025-02-14 | 苏州礼乐乐器股份有限公司 | A full-band high-quality electronic product speaker with sound beam and sound tunnel |
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Granted publication date: 20210129 Effective date of abandoning: 20250214 |