CN219919150U - Bone conduction loudspeaker and electronic equipment - Google Patents
Bone conduction loudspeaker and electronic equipment Download PDFInfo
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- CN219919150U CN219919150U CN202320504187.3U CN202320504187U CN219919150U CN 219919150 U CN219919150 U CN 219919150U CN 202320504187 U CN202320504187 U CN 202320504187U CN 219919150 U CN219919150 U CN 219919150U
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- voice coil
- bone conduction
- suspension
- conduction speaker
- cup
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- 210000000988 bone and bone Anatomy 0.000 title claims abstract description 58
- 239000000725 suspension Substances 0.000 claims abstract description 86
- 239000000428 dust Substances 0.000 claims description 5
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000005389 magnetism Effects 0.000 claims 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000002427 irreversible effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 210000000860 cochlear nerve Anatomy 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
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Abstract
The utility model provides a bone conduction loudspeaker, which comprises a bracket component and a magnetic circuit component, wherein the bracket component comprises an outer frame, a first cover body arranged at one end of the outer frame and a second cover body arranged at the other end of the outer frame, an elastic suspension is arranged between the first cover body and the second cover body, the magnetic circuit component comprises a magnetic cup arranged on the elastic suspension, a first space is arranged between the bottom of the elastic suspension and the first cover body, a second space is arranged between the top of the magnetic cup and the second cover body, when the elastic suspension vibrates along with the magnetic circuit component, the elastic suspension floats up and down in the first space, and the top of the magnetic cup floats in the second space. The utility model further provides electronic equipment.
Description
Technical Field
The utility model relates to the technical field of speakers, in particular to a bone conduction speaker and electronic equipment.
Background
Along with the continuous progress of electronic science and technology, electronic products have entered into aspects of life of people, wherein important acoustic components in audio products of speakers are widely used in equipment such as sound equipment, speakers are transducer components for converting electric signals into acoustic signals, and the performance of the speakers is greatly affected on sound quality.
The traditional loudspeaker is mainly divided into an air conduction type and a bone conduction type according to the sound conduction mode, the air conduction type loudspeaker is developed for decades and is gradually paid attention to in recent years, the bone conduction type loudspeaker directly transmits sound waves (vibration signals) converted by electric signals to acoustic nerves through bones, the bone conduction omits a plurality of sound wave transmission steps, clear sound restoration can be realized in a noisy environment, and the sound waves cannot be influenced by diffusion in the air.
However, the existing bone conduction speaker has poor protection effect, the vibration part in the bone conduction speaker is easy to be damaged in the testing and working processes, and when the vibration part in the bone conduction speaker vibrates, the suspension connected with the vibration part is easy to generate irreversible deformation; the bone conduction loudspeaker generates noise, and the use experience of a user is affected.
Disclosure of Invention
Based on the above, the utility model aims to provide a bone conduction speaker and an electronic device, which are used for solving the problems that the bone conduction speaker in the prior art has poor protection effect, the vibration part of the bone conduction speaker is easy to damage in the testing and working processes, and in addition, when the vibration part of the bone conduction speaker vibrates, the suspension connected with the vibration part is easy to generate irreversible deformation; the bone conduction loudspeaker is enabled to generate noise, and the use experience of a user is affected.
The utility model provides a bone conduction loudspeaker which comprises a bracket component and a magnetic circuit component, wherein the bracket component comprises an outer frame, a first cover body arranged at one end of the outer frame and a second cover body arranged at the other end of the outer frame, an elastic suspension is arranged between the first cover body and the second cover body, the magnetic circuit component comprises a magnetic cup arranged on the elastic suspension, a first space is arranged between the bottom of the elastic suspension and the first cover body, a second space is arranged between the top of the magnetic cup and the second cover body, and when the elastic suspension vibrates along with the magnetic circuit component, the elastic suspension floats up and down in the first space, and the top of the magnetic cup floats in the second space.
The beneficial effects of the utility model are as follows: the bone conduction loudspeaker comprises a bracket component and a magnetic circuit component, wherein the bracket component comprises an outer frame, a first cover body arranged at one end of the outer frame and a second cover body arranged at the other end of the outer frame, an elastic suspension is arranged between the first cover body and the second cover body, the magnetic circuit component comprises a magnetic cup arranged on the elastic suspension, and the magnetic circuit component is a vibrating component in the bone conduction loudspeaker; further, a first space is arranged between the bottom end of the elastic suspension and the first cover body, a second space is arranged between the top of the magnetic cup and the second cover body, and when the elastic suspension vibrates along with the magnetic circuit assembly, the elastic suspension floats up and down in the first space, and the top of the magnetic cup floats in the second space; the first space and the second space arranged in the bone conduction loudspeaker are both in the natural rebound range of the elastic suspension, the bottom end of the elastic suspension floats in the first space when the elastic suspension vibrates downwards along with the magnetic circuit assembly, the top of the magnetic cup floats in the second space when the elastic suspension vibrates upwards along with the magnetic circuit assembly, the elastic suspension is connected with the magnetic circuit assembly, namely, the elastic suspension floats up and down in the second space, and the vibration amplitude of the elastic suspension is in the natural rebound range through the arrangement of the first space and the second space, so that irreversible deformation of the elastic suspension is prevented; through the design, noise generated by the bone conduction loudspeaker can be effectively reduced, and the use experience of a user is improved.
Preferably, the magnetic circuit assembly further comprises a support ring arranged between the elastic suspension and the magnetic cup, a magnet, a polar plate and an upright post penetrating through the center of the support ring, the magnetic cup, the magnet and the polar plate are in a U shape, the inner diameter of the magnetic cup is larger than the outer diameter of the magnet, and the magnet is arranged in the magnetic cup.
Preferably, the bone conduction speaker further comprises a voice coil assembly, the voice coil assembly comprises a voice coil, a bonding pad and a lead, and the voice coil is electrically connected with the bonding pad through the lead.
Preferably, the voice coil is disposed at one end of the second cover body, the voice coil is annular, the outer diameter of the voice coil is smaller than the inner diameter of the magnetic cup, the inner diameter of the voice coil is larger than the outer diameter of the magnet, the voice coil is disposed between the magnetic cup and the magnet, and the bonding pad is disposed at the other end of the second cover body.
Preferably, the bonding pad is semicircular, lead contact areas are arranged at openings at two ends of the bonding pad, first contact pins are arranged in the lead contact areas, second contact pins are arranged on the voice coil, one end of the lead is electrically connected with the first contact pins, and the other end of the lead is electrically connected with the second contact pins.
Preferably, an avoidance groove is formed in the side wall of the second cover body, one end of the lead wire is electrically connected with the bonding pad, and the other end of the lead wire penetrates through the avoidance groove and is electrically connected with the voice coil.
Preferably, the elastic suspension comprises a first annular suspension part and a second annular suspension part, the side wall of the first suspension part is connected with the side wall of the outer frame, the second suspension part comprises a plurality of suspension elastic sheets and a suspension table arranged in the middle of the suspension elastic sheets, the support ring is arranged on the suspension table, the magnetic cup is arranged on the support ring, and the outer diameter of the magnetic cup is larger than the inner diameter of the first suspension part.
Preferably, a first mounting groove, a second mounting groove and a third mounting groove are formed in the outer frame, the first cover body is arranged in the first mounting groove, the second cover body is arranged in the second mounting groove, and the elastic suspension is arranged in the third mounting groove.
Preferably, a supporting frame is arranged at the top end of the second cover body, and a dust screen is arranged on the supporting frame.
Another aspect of the utility model provides an electronic device comprising the bone conduction speaker described above.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
Fig. 1 is a schematic structural diagram of a bone conduction speaker according to a first embodiment of the present utility model;
fig. 2 is a schematic cross-sectional view of a bone conduction speaker according to a first embodiment of the present utility model;
fig. 3 is a schematic structural diagram of a bracket assembly of a bone conduction speaker according to a first embodiment of the present utility model;
fig. 4 is a schematic structural diagram of a magnetic circuit assembly of a bone conduction speaker according to a first embodiment of the present utility model;
fig. 5 is a schematic structural diagram of a voice coil assembly of a bone conduction speaker according to a first embodiment of the present utility model;
fig. 6 is a schematic diagram of a second cover structure of a bone conduction speaker according to the first embodiment of the present utility model;
fig. 7 is a schematic view of an elastic suspension structure of a bone conduction speaker according to a first embodiment of the present utility model;
fig. 8 is a schematic cross-sectional view of an outer frame of a bone conduction speaker according to a first embodiment of the present utility model;
fig. 9 is a schematic structural diagram of a bone conduction speaker according to a second embodiment of the present utility model.
Description of main reference numerals:
| bracket assembly | 10 | Outer frame | 11 |
| First mounting groove | 111 | Second mounting groove | 112 |
| Third mounting groove | 113 | First cover body | 12 |
| Elastic suspension | 13 | A first hanging part | 131 |
| A second hanging part | 132 | Suspension spring plate | 1321 |
| Hanging table | 1322 | Second cover body | 14 |
| Avoidance groove | 141 | Supporting frame | 142 |
| Dust-proof net | 15 | Magnetic circuit assembly | 20 |
| Support ring | 21 | Magnetic cup | 22 |
| Magnet body | 23 | Polar plate | 24 |
| Upright post | 25 | Voice coil assembly | 30 |
| Voice coil | 31 | Bonding pad | 32 |
| Lead contact area | 321 | Lead wire | 33 |
The utility model will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Several embodiments of the utility model are presented in the figures. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1 to 4, there is shown a bone conduction speaker according to a first embodiment of the present utility model, including: a bracket assembly 10 and a magnetic circuit assembly 20. The bracket assembly 10 comprises an outer frame 11, a first cover body 12 arranged at one end of the outer frame 11 and a second cover body 14 arranged at the other end of the outer frame 11, wherein an elastic suspension 13 is arranged between the first cover body 12 and the second cover body 14, the outer frame 11 can be an integrally formed annular cylinder, the first cover body 12 is connected with the bottom end of the outer frame 11, the elastic suspension 13 can be arranged close to the first cover body 12, and the second cover body 14 is connected with the top end of the outer frame 11. The magnetic circuit assembly 20 comprises a magnetic cup 22 arranged on the elastic suspension 13, as shown in fig. 2, a first space is arranged between the bottom of the elastic suspension 13 and the first cover 12, and the distance between the first space and the first cover can be D 1 A second space is arranged between the magnetic cup 22 and the second cover 14, and the distance between the second space and the second cover can be D 2 As the elastic suspension 13 oscillates with the magnetic circuit assembly 20When in motion, the bottom end of the elastic suspension 13 floats up and down in the first space, and the top of the magnetic cup floats in the second space; the deformation of the elastic suspension 13 between the first space and the second space is natural resilient, i.e. reversible.
According to the bone conduction speaker provided by the utility model, the magnetic circuit assembly 20 is a vibrating component in the bone conduction speaker, the magnetic circuit assembly 20 is arranged in the bracket assembly 10, and the bracket assembly 10 can provide good protection for the magnetic circuit assembly 20 and prevent the magnetic circuit assembly 20 from being damaged in the testing and working processes. Further, it will be appreciated that when the elastic suspension 13 vibrates downward with the magnetic circuit assembly 20, the lower end of the elastic suspension 13 floats in the first space, and the maximum amplitude of the floating of the elastic suspension 13 is D 1 The method comprises the steps of carrying out a first treatment on the surface of the When the elastic suspension 13 vibrates upwards along with the magnetic circuit assembly 20, the top of the magnetic cup 22 floats in the second space, and the maximum floating amplitude is D 2 The elastic suspension 13 is connected with the magnetic circuit assembly 22, i.e. the maximum amplitude of the floating of the elastic suspension 13 is D 2 By arranging the first space and the second space, the vibration amplitude of the elastic suspension 13 is in the natural rebound range, so that the elastic suspension 13 is prevented from generating irreversible deformation; through the design, noise generated by the bone conduction loudspeaker can be effectively reduced, and the use experience of a user is improved.
As shown in fig. 2 and 4, the magnetic circuit assembly 20 further includes a support ring 21 disposed between the elastic suspension 13 and the magnetic cup, a magnet 23, a pole plate 24, and a post 25 penetrating through the centers of the support ring 21, the magnetic cup 22, the magnet 23, and the pole plate 24, where the support ring 21 can be adhered to the middle area of the elastic suspension 13 by dustproof glue, the centers of the support ring 21, the magnetic cup 22, the magnet 23, and the pole plate 24 are all provided with through holes, the post 25 penetrates through the through holes, the magnetic cup 22 is in a "U" shape, the magnet 23 and the pole plate 24 are both in a circular shape, the inner diameter of the magnetic cup 22 is larger than the outer diameter of the magnet 23, and the magnet 23 is disposed in the magnetic cup 22; preferably, the magnetic cup 22 is opposite to the pole of the magnet 23.
As shown in fig. 2 and 5, the bone conduction speaker provided by the utility model further includes a voice coil assembly, the voice coil assembly 30 includes a voice coil 31, a bonding pad 32 and a lead 33, the voice coil 31 is electrically connected with the bonding pad 32 through the lead 33, the voice coil 31 may be in an annular structure, the voice coil 31 is connected with one end of the second cover 14, preferably, the voice coil 31 may be adhered to one end of the second cover 14 through a dustproof glue, the outer diameter of the voice coil 31 is smaller than the inner diameter of the magnetic cup 22, the inner diameter of the voice coil 31 is larger than the outer diameter of the magnet 23, the voice coil 31 is disposed between the magnetic cup 22 and the magnet 23, the bonding pad 32 may be in a semicircle shape, the openings at two ends of the bonding pad 32 are provided with lead contact areas 321, the lead contact areas 321 are provided with first contact pins (not shown in the drawing), one end of the lead 33 is electrically connected with the first contact pins, the other end of the lead 33 is electrically connected with the second contact pins, and the lead 33 may be a wire or a wire with good conductive metal such as a copper wire.
As shown in fig. 2 and 6, the side wall of the second cover 14 is provided with avoiding grooves 141, and the number of preferred avoiding grooves 141 corresponds to the number of the leads 22, as shown in fig. 6, the number of the avoiding grooves 141 may be two, one end of the lead 22 is electrically connected with the bonding pad 32, and the other end of the lead 33 penetrates through the avoiding grooves 141 and is electrically connected with the voice coil 31.
As shown in fig. 2 and 7, the shape of the elastic suspension 13 corresponds to the outer frame 11, and includes a first annular suspension portion 131 and a second annular suspension portion 132, the side wall of the first suspension portion 131 is connected with the side wall of the outer frame 11, the second suspension portion 132 includes a plurality of suspension elastic pieces 1321 and a suspension table 1322 arranged in the middle of the plurality of suspension elastic pieces 1321, the support ring 21 is arranged on the suspension table 1322, the magnetic cup 22 is arranged on the support ring 21, and the outer diameter of the magnetic cup 22 is larger than the inner diameter of the first suspension portion 131; it will be appreciated that, since the outer diameter of the magnetic cup 22 is greater than the inner diameter of the first suspension portion 131, when the magnetic circuit assembly 20 vibrates downward in the bone conduction speaker, the periphery of the bottom end of the magnetic cup 22 collides with the first suspension portion 131, and the suspension first region 131 provides physical support for the magnetic cup 22 at the collision position, so that the elastic suspension 13 does not deform greatly at the collision position during the collision.
In this embodiment, as shown in fig. 8, the end portion of the outer frame 11 is provided with a first mounting groove 111, a second mounting groove 112 and a third mounting groove 113, the first mounting groove 111, the second mounting groove 112 and the third mounting groove 113 are all in an annular structure, the first mounting groove 111 may be disposed at the bottom end of the outer frame 11, the second mounting groove 112 may be disposed at the top end of the outer frame 11, the third mounting groove 113 may be disposed in the outer frame 11 and near the first mounting groove 111, the first cover 12 is disposed in the first mounting groove 111, the second cover 14 is disposed in the second mounting groove 112, and the elastic suspension 13 is disposed in the third mounting groove 113.
The second embodiment of the present utility model also provides a bone conduction speaker, which is different from the bone conduction speaker provided in the previous embodiment in that:
as shown in fig. 6 and 9, a supporting frame 142 is provided at the top end of the second cover 14, a dust screen 15 may be further provided on the supporting frame, and the dust screen 15 may prevent foreign matters such as external dust from entering the bone conduction speaker, thereby protecting the product.
The third embodiment of the present utility model also provides an electronic device, which includes the bone conduction speaker in the above embodiment when implemented. The electronic equipment can be an earphone, a sound box and the like, and is within the protection scope of the utility model.
In summary, the bone conduction speaker provided by the utility model can provide good protection for the vibration component, prevent the magnetic circuit assembly from being damaged in the testing and working processes, further limit the maximum floating amplitude of the elastic suspension vibrating along with the magnetic circuit assembly within the natural rebound range, prevent the elastic suspension from generating irreversible deformation, effectively reduce the noise generated by the bone conduction speaker and improve the use experience of users.
It should be noted that the foregoing implementation procedure is only for illustrating the feasibility of the present utility model, but this does not represent the only implementation procedure of the bone conduction speaker of the present utility model, and may be included in the feasible embodiment of the present utility model, as long as the bone conduction speaker of the present utility model can be implemented.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing examples illustrate only a few embodiments of the utility model and are described in detail herein without thereby limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (10)
1. A bone conduction speaker, characterized in that: including bracket component, magnetic circuit subassembly, bracket component includes the frame, locates the first lid of frame one end and locates the second lid of frame other end, first lid with be equipped with elasticity between the second lid and hang, magnetic circuit subassembly is including locating the magnetism cup on the elasticity is hung, the bottom of elasticity is hung with be equipped with first space between the first lid, the top of magnetism cup with be equipped with the second space between the second lid, works as the elasticity is hung along with when the magnetic circuit subassembly vibrates, the elasticity is hung and is in the first space is internal to float from top to bottom, the top of magnetism cup is in float in the second space.
2. A bone conduction speaker as in claim 1, wherein: the magnetic circuit assembly further comprises a support ring arranged between the elastic suspension and the magnetic cup, a magnet, a polar plate and an upright post penetrating through the center of the support ring, the magnetic cup and the polar plate, wherein the magnet and the polar plate are sequentially arranged on the magnetic cup, the magnetic cup is U-shaped, the magnet and the polar plate are circular, and the inner diameter of the magnetic cup is larger than the outer diameter of the magnet and the magnet is arranged in the magnetic cup.
3. A bone conduction speaker as in claim 2, wherein: the bone conduction loudspeaker further comprises a voice coil assembly, wherein the voice coil assembly comprises a voice coil, a bonding pad and a lead, and the voice coil is electrically connected with the bonding pad through the lead.
4. A bone conduction speaker according to claim 3, wherein: the voice coil loudspeaker voice coil is located the one end of second lid, the voice coil loudspeaker voice coil is annular, the external diameter of voice coil loudspeaker voice coil is less than the internal diameter of magnetic cup, the internal diameter of voice coil loudspeaker voice coil is greater than the external diameter of magnet, just the voice coil loudspeaker voice coil is located magnetic cup with between the magnet, the pad is located the other end of second lid.
5. A bone conduction speaker according to claim 3, wherein: the bonding pad is semicircular, lead contact areas are arranged at openings at two ends of the bonding pad, first contact pins are arranged in the lead contact areas, second contact pins are arranged on the voice coil, one end of each lead is electrically connected with the corresponding first contact pin, and the other end of each lead is electrically connected with the corresponding second contact pin.
6. A bone conduction speaker according to claim 3, wherein: the side wall of the second cover body is provided with an avoidance groove, one end of the lead wire is electrically connected with the bonding pad, and the other end of the lead wire penetrates through the avoidance groove and is electrically connected with the voice coil.
7. A bone conduction speaker as in claim 2, wherein: the elastic suspension comprises a first annular suspension part and a second annular suspension part, wherein the side wall of the first suspension part is connected with the side wall of the outer frame, the second suspension part comprises a plurality of suspension elastic sheets and a suspension table arranged in the middle of the suspension elastic sheets, the support ring is arranged on the suspension table, the magnetic cup is arranged on the support ring, and the outer diameter of the magnetic cup is larger than the inner diameter of the first suspension part.
8. A bone conduction speaker as in claim 1, wherein: the novel multifunctional electric water heater is characterized in that a first mounting groove, a second mounting groove and a third mounting groove are formed in the outer frame, the first cover body is arranged in the first mounting groove, the second cover body is arranged in the second mounting groove, and the elastic suspension is arranged in the third mounting groove.
9. A bone conduction speaker as in claim 1, wherein: the top end of the second cover body is provided with a supporting frame, and the supporting frame is provided with a dust screen.
10. An electronic device, characterized in that: a bone conduction speaker including any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320504187.3U CN219919150U (en) | 2023-03-15 | 2023-03-15 | Bone conduction loudspeaker and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320504187.3U CN219919150U (en) | 2023-03-15 | 2023-03-15 | Bone conduction loudspeaker and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219919150U true CN219919150U (en) | 2023-10-27 |
Family
ID=88422992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320504187.3U Active CN219919150U (en) | 2023-03-15 | 2023-03-15 | Bone conduction loudspeaker and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219919150U (en) |
-
2023
- 2023-03-15 CN CN202320504187.3U patent/CN219919150U/en active Active
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