CN219322571U - Micro speaker and audio device - Google Patents
Micro speaker and audio device Download PDFInfo
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- CN219322571U CN219322571U CN202320024830.2U CN202320024830U CN219322571U CN 219322571 U CN219322571 U CN 219322571U CN 202320024830 U CN202320024830 U CN 202320024830U CN 219322571 U CN219322571 U CN 219322571U
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Abstract
The utility model discloses a micro-speaker and audio equipment, the micro-speaker includes: a housing assembly; the magnetic assembly is arranged in the shell assembly and comprises a first magnetic piece and a second magnetic piece which is spaced from the first magnetic piece and is arranged opposite to the first magnetic piece, and the magnetic pole of one side of the first magnetic piece, which is close to the second magnetic piece, is the same as the magnetic pole of one side of the second magnetic piece, which is close to the first magnetic piece; the flat voice coil is fixedly arranged between the first magnetic piece and the second magnetic piece, and an installation gap is formed between the flat voice coil and the first magnetic piece or the second magnetic piece; the vibration assembly is arranged in the shell assembly and comprises a vibrating diaphragm connected with the shell assembly and a magnetizable body connected to the vibrating diaphragm, and at least part of the magnetizable body is movably arranged in the installation gap. The utility model can reduce the total height, improve the moving precision of the magnetizable body and reduce the distortion.
Description
Technical Field
The utility model relates to the technical field of speakers, in particular to a miniature speaker and audio equipment.
Background
With the development of the TWS (true wireless stereo, real wireless stereo) earphone, the TWS earphone is gradually developed towards miniaturization, so that each component of the TWS earphone needs to be required to be miniaturized, and the loudspeaker is one of key components of the TWS earphone, so that the occupied space of the TWS earphone is reduced, and the volume of the TWS earphone can be effectively reduced. In the related art, most of speakers have a high overall height and a large occupied space, so that the development of miniaturization of the earphone is limited.
The main reason why the total height of most of the speakers is high at present is that the voice coils of the speakers generally adopt long voice coils, the total height is high after the long voice coils are overlapped with the vibrating diaphragm, and when the long voice coils are adopted, a part of voice coils are not in a linear magnetic field, so that the distortion degree is high.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the micro-speaker, which can reduce the occupied space of the speaker and/or reduce distortion.
The utility model also provides audio equipment with the micro loudspeaker.
According to an embodiment of the first aspect of the present utility model, a micro speaker includes: a housing assembly; the magnetic assembly is arranged in the shell assembly and comprises a first magnetic piece and a second magnetic piece which is arranged at intervals with the first magnetic piece and is opposite to the first magnetic piece, and the magnetic pole of one side, close to the second magnetic piece, of the first magnetic piece is the same as the magnetic pole of one side, close to the first magnetic piece, of the second magnetic piece; the flat voice coil is fixedly arranged between the first magnetic piece and the second magnetic piece, an installation gap is formed between the flat voice coil and the first magnetic piece or between the flat voice coil and the second magnetic piece, a north-south magnetic pole can be formed when the flat voice coil is electrified, a north magnetic pole of the flat voice coil faces the second magnetic piece when the south magnetic pole of the flat voice coil faces the first magnetic piece, and a south magnetic pole of the flat voice coil faces the second magnetic piece when the north magnetic pole of the flat voice coil faces the first magnetic piece; the vibration assembly is arranged in the shell assembly and comprises a vibrating diaphragm connected with the shell assembly and a magnetizable body connected to the vibrating diaphragm, and at least part of the magnetizable body is movably arranged in the installation gap.
The micro-speaker according to the embodiment of the utility model has at least the following beneficial effects:
in the micro-speaker of the present utility model, when the flat voice coil is energized, the magnetizable body is magnetized by the flat voice coil, that is, the magnetizable body also generates north and south poles, when the south pole of the magnetizable body faces the first magnetic member after being magnetized, the north pole of the magnetizable body faces the second magnetic member, and when the north pole of the magnetizable body faces the first magnetic member, the south pole of the magnetizable body faces the second magnetic member. So, but the magnetizable body can be towards or be moved away from first magnetic part under the combined action of first magnetic part and second magnetic part to drive the vibrating diaphragm vibration, but the effort that the magnetizable body receives is big, is favorable to improving electromagnetic conversion efficiency, and, but first magnetic part and second magnetic part can provide more even magnetic field, but the magnetizable body sets up in the installation clearance, but the great majority of magnetizable body is in even linear magnetic field, so, but can improve magnetizable body motion precision, the reduction distortion.
The micro-speaker of the utility model adopts the flat voice coil, which can reduce the total height of the speaker and the occupied space, thereby reducing the volume of the audio device and miniaturizing the audio device.
In some embodiments, the magnetizable body is made of iron, cobalt or nickel.
In some embodiments, the wire of the flat voice coil is wound to form an avoidance area, the magnetizable body includes a first magnetizable portion, and a second magnetizable portion connected to the first magnetizable portion, the first magnetizable portion is located in the installation gap, and the second magnetizable portion is penetrating through the avoidance area.
In some embodiments, the first magnetic member is provided with a first middle hole, the installation gap is formed between the flat voice coil and the second magnetic member, and the second magnetizable portion is further arranged through the first middle hole.
In some of these embodiments, the second magnetic member is provided with a second middle hole coaxially disposed with the first middle hole, and the housing assembly is provided with an acoustic exit hole opposite to the second middle hole.
In some embodiments, the wires of the flat voice coil form a spiral structure, and a length direction of an axis of the spiral structure is the same as a spacing direction of the first magnetic member and the second magnetic member.
In some of these embodiments, the housing assembly is provided with tuning holes where tuning nets are provided.
In some embodiments, the housing assembly includes a bracket, and a cover body covering the bracket, the first magnetic member is fixed on the inner side of the bracket, and the second magnetic member is fixed on the inner side of the cover body.
In some embodiments, a fixing ring is connected to the outer periphery of the diaphragm, the fixing ring is disposed on the support, and the cover presses on the fixing ring.
An audio device according to an embodiment of the second aspect of the utility model comprises a micro-speaker as described above.
The audio device according to the embodiment of the utility model has at least the following beneficial effects:
in the micro speaker of the audio device, when the flat voice coil is electrified, the magnetizable body is magnetized under the action of the flat voice coil, namely, the magnetizable body can generate north and south poles, when the south pole of the magnetizable body faces the first magnetic piece after being magnetized, the north pole of the magnetizable body faces the second magnetic piece, and when the north pole of the magnetizable body faces the first magnetic piece, the south pole of the magnetizable body faces the second magnetic piece. So, but the magnetizable body can be towards or be moved away from first magnetic part under the combined action of first magnetic part and second magnetic part to drive the vibrating diaphragm vibration, but the effort that the magnetizable body receives is big, is favorable to improving electromagnetic conversion efficiency, and, but first magnetic part and second magnetic part can provide more even magnetic field, but the magnetizable body sets up in the installation clearance, but the great majority of magnetizable body is in even linear magnetic field, so, but can improve magnetizable body motion precision, the reduction distortion.
The micro-speaker of the utility model adopts the flat voice coil, which can reduce the total height of the speaker and the occupied space, thereby reducing the volume of the audio device and miniaturizing the audio device.
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
The utility model is further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic bottom view of a micro-speaker according to an embodiment of the present utility model;
FIG. 2 is a schematic cross-sectional view of the graphic of FIG. 1 taken along section A-A;
FIG. 3 is an enlarged view at B in FIG. 2;
fig. 4 is a schematic top view of a micro-speaker according to an embodiment of the present utility model;
fig. 5 is a schematic diagram of a magnetizable body magnetized by a flat voice coil according to an embodiment of the utility model.
Reference numerals:
10. a mounting gap;
100. a housing assembly; 101. a sound outlet hole; 102. a wire through hole; 103. a tuning hole; 110. a bracket; 120. a cover body;
200. a magnetic assembly; 210. a first magnetic member; 211. a first mesopore; 220. a second magnetic member; 221. a second mesopore;
300. a flat voice coil;
400. a vibration assembly; 410. a vibrating diaphragm; 420. a magnetizable body; 421. a first magnetizable portion; 422. a second magnetizable portion;
500. a fixing ring;
600. a PCB board;
700. tuning net.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and to simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1 to 4, a micro speaker according to an embodiment of the present utility model includes a housing assembly 100, a magnetic assembly 200, a flat type voice coil 300, and a vibration assembly 400.
As shown in fig. 2, the housing assembly 100 is a hollow structure.
The magnetic assembly 200 is disposed inside the housing assembly 100, and the magnetic assembly 200 includes a first magnetic member 210 and a second magnetic member 220 disposed opposite to the first magnetic member 210 with a distance between the first magnetic member 210, wherein a side of the first magnetic member 210 adjacent to the second magnetic member 220 is the same as a magnetic pole of a side of the second magnetic member 220 adjacent to the first magnetic member 210.
Specifically, the first magnetic element 210 and the second magnetic element 220 are both magnetic members, and optionally, the first magnetic element 210 and the second magnetic element 220 are both magnets. The first magnetic element 210 and the second magnetic element 220 are both fixedly disposed inside the housing assembly 100, the relative positions of the first magnetic element 210 and the second magnetic element 220 are fixed, and the first magnetic element 210 and the second magnetic element 220 are spaced apart and are oppositely disposed.
In this embodiment, the side of the first magnetic element 210 close to the second magnetic element 220 is an S pole, the side of the first magnetic element 210 facing away from the second magnetic element 220 is an N pole, the side of the second magnetic element 220 close to the first magnetic element 210 is an S pole, and the side of the second magnetic element 220 facing away from the first magnetic element 210 is an N pole.
More specifically, the first magnetic element 210 is located below the second magnetic element 220, i.e., the upper side of the first magnetic element 210 is an S-pole, the lower side of the first magnetic element 210 is an N-pole, the lower side of the second magnetic element 220 is an S-pole, and the upper side of the second magnetic element 220 is an N-pole.
In other embodiments, the side of the first magnetic element 210 close to the second magnetic element 220 is N-pole, the side of the first magnetic element 210 facing away from the second magnetic element 220 is S-pole, the side of the second magnetic element 220 close to the first magnetic element 210 is N-pole, and the side of the second magnetic element 220 facing away from the first magnetic element 210 is S-pole.
Referring to fig. 2 and 3, the flat type voice coil 300 is fixedly disposed between the first magnetic member 210 and the second magnetic member 220, and an installation gap 10 is formed between the flat type voice coil 300 and the second magnetic member 220.
Specifically, the flat type voice coil 300 is fixedly disposed on the first magnetic member 210, and a mounting gap 10 is formed between the flat type voice coil 300 and the second magnetic member 220.
Further, the flat voice coil 300 can form a north-south magnetic pole when energized, the north magnetic pole of the flat voice coil 300 faces the second magnetic member 220 when the south magnetic pole of the flat voice coil 300 faces the first magnetic member 210, and the south magnetic pole of the flat voice coil 300 faces the second magnetic member 220 when the north magnetic pole of the flat voice coil 300 faces the first magnetic member 210.
It will be appreciated that when the flat voice coil 300 is energized, the direction of the current flow in the flat voice coil 300 changes, which causes the position of the north-south poles of the flat voice coil 300 to change.
As shown in fig. 2 and 5, the vibration assembly 400 is disposed inside the housing assembly 100, and the vibration assembly 400 includes a diaphragm 410 connected to the housing assembly 100, and a magnetizable body 420 connected to the diaphragm 410, at least a portion of the magnetizable body 420 being movably disposed in the mounting gap 10.
In other embodiments, a mounting gap is formed between the flat voice coil 300 and the first magnetic member 210, and at least a portion of the magnetizable body 420 is movably disposed in the mounting gap between the flat voice coil 300 and the first magnetic member 210.
In the micro-speaker of the present utility model, when the flat voice coil 300 is energized, the magnetizable body 420 is magnetized by the flat voice coil 300, that is, the magnetizable body 420 also generates north and south poles, when the south pole of the magnetizable body 420 faces the first magnetic member 210, the north pole of the magnetizable body 420 faces the second magnetic member 220, and when the north pole of the magnetizable body 420 faces the first magnetic member 210, the south pole of the magnetizable body 420 faces the second magnetic member 220. In this way, the magnetizable body 420 can move towards or away from the first magnetic element 210 under the combined action of the first magnetic element 210 and the second magnetic element 220, so as to drive the vibrating diaphragm 410 to vibrate, the acting force borne by the magnetizable body 420 is large, which is beneficial to improving the electromagnetic conversion efficiency, in addition, the first magnetic element 210 and the second magnetic element 220 can provide a more uniform magnetic field, the magnetizable body 420 is arranged in the installation gap 10, and the vast majority of the magnetizable body 420 is in a uniform linear magnetic field, so that the movement precision of the magnetizable body 420 can be improved, and the distortion is reduced.
The flat voice coil 300 is used in the micro-speaker of the present utility model, so that the overall height of the speaker can be reduced and the occupied space can be reduced.
The magnetizable body 420 is made of iron, cobalt or nickel.
As shown in fig. 2 and 3, in one embodiment, the wire of the flat voice coil 300 is wound to form an avoidance region, the magnetizable body 420 includes a first magnetizable portion 421 and a second magnetizable portion 422 connected to the first magnetizable portion 421, the first magnetizable portion 421 is located in the mounting gap 10, and the second magnetizable portion 422 is disposed in the avoidance region.
Specifically, the magnetizable body 420 is a T-shaped armature, and the second magnetizable portion 422 is disposed through an avoidance area formed by winding a wire of the flat voice coil 300, so that the magnitude of magnetic force of the magnetizable body 420 after being magnetized is improved.
Specifically, the wires of the flat voice coil 300 form a spiral structure, and the middle portion of the spiral structure is an avoidance region.
Further, the length direction of the axis of the spiral structure is the same as the spacing direction of the first magnetic member 210 and the second magnetic member 220.
Specifically, the spiral structure of the wire of the flat type voice coil 300 is similar to that of the mosquito coil, so that a flattened design of the voice coil can be achieved, and the length direction of the axis of the spiral structure is the same as the spacing direction of the first magnetic member 210 and the second magnetic member 220. In this way, the direction of the current on the flat voice coil 300 can be kept perpendicular to the direction of the magnetic field, which is advantageous in improving the motion accuracy of the flat voice coil 300 and reducing distortion.
In one embodiment, as shown in fig. 2, the outer edge of the diaphragm 410 is connected to the housing assembly 100, the middle portion of the diaphragm 410 has a planar structure, and the magnetizable body 420 is fixed to the middle portion of the diaphragm 410.
Specifically, the middle part of the diaphragm 410 has a planar structure, which is beneficial to fixing the magnetizable body 420 and the diaphragm 410, and the middle part of the diaphragm 410 adopts a planar structure, so that the height of the vibration assembly 400 can be reduced, and the height of the micro-speaker can be reduced as much as possible.
More specifically, the magnetizable body 420 is bonded to the diaphragm 410, and bonding the magnetizable body 420 to the planar structure facilitates the reliability of the connection of the magnetizable body 420 to the diaphragm 410.
Wherein, the magnetizable body 420 and the vibrating diaphragm 410 are bonded by adhesive.
In other embodiments, the magnetizable body 420 and the diaphragm 410 may be welded or otherwise fixed.
In another embodiment, the diaphragm 410 has an opening in the middle, and the magnetizable body 420 is attached to the edge of the opening in the middle of the diaphragm 410.
As shown in fig. 2 and 4, the housing assembly 100 is provided with the sound outlet 101, so that the diaphragm 410 can transmit sound to the outside through the sound outlet 101 when vibrating.
Specifically, the sound outlet 101 is disposed in front of the diaphragm 410.
In one embodiment, the first magnetic element 210 and the second magnetic element 220 are both in an annular structure, the first magnetic element 210 is provided with a first middle hole 211, the second magnetic element 220 is provided with a second middle hole 221 coaxially arranged with the first middle hole 211, and the housing assembly 100 is provided with an acoustic outlet 101 opposite to the second middle hole 221.
As shown in fig. 3, further, an installation gap 10 is formed between the flat voice coil 300 and the second magnetic member 220, and the second magnetizable portion 422 is further disposed through the first middle hole 211.
As shown in fig. 2, in one embodiment, the housing assembly 100 is further provided with a tuning hole 103, a tuning net 700 is disposed at the tuning hole 103, and the tuning hole 103 and the tuning net 700 are used for playing a tuning role and improving the sound quality effect.
As shown in fig. 2, in one embodiment, the housing assembly 100 includes a bracket 110, and a cover 120 covering the bracket 110, the first magnetic member 210 is fixed on the inner side of the bracket 110, and the second magnetic member 220 is fixed on the inner side of the cover 120.
Specifically, in this embodiment, the sound outlet 101 is formed on the cover 120, and the tuning hole 103 is formed on the bracket 110.
Further, a fixing ring 500 is connected to the outer circumference of the diaphragm 410, the fixing ring 500 is disposed on the support 110, and the cover 120 is pressed against the fixing ring 500. The cover 120 is used to fix the fixing ring 500 to the bracket 110, thereby achieving the fixation of the diaphragm 410.
In one embodiment, the housing assembly 100 is further provided with a PCB 600, and the housing assembly 100 is provided with a via 102, and the via 102 is used for a signal line to pass through, where the signal line can connect the PCB 600 and an internal device of the housing assembly 100.
An embodiment also relates to an audio device comprising a micro-speaker as described above.
The audio device of the present utility model may be a headset, a sound box, etc.
In the micro speaker of the audio device of the present utility model, when the flat voice coil 300 is energized, the magnetizable body 420 is magnetized under the action of the flat voice coil 300, that is, the magnetizable body 420 will also generate north and south poles, after the magnetizable body 420 is magnetized, when the south pole of the magnetizable body 420 faces the first magnetic member 210, the north pole of the magnetizable body 420 faces the second magnetic member 220, and when the north pole of the magnetizable body 420 faces the first magnetic member 210, the south pole of the magnetizable body 420 faces the second magnetic member 220. In this way, the magnetizable body 420 can move towards or away from the first magnetic element 210 under the combined action of the first magnetic element 210 and the second magnetic element 220, so as to drive the vibrating diaphragm 410 to vibrate, the acting force borne by the magnetizable body 420 is large, which is beneficial to improving the electromagnetic conversion efficiency, in addition, the first magnetic element 210 and the second magnetic element 220 can provide a more uniform magnetic field, the magnetizable body 420 is arranged in the installation gap 10, and the vast majority of the magnetizable body 420 is in a uniform linear magnetic field, so that the movement precision of the magnetizable body 420 can be improved, and the distortion is reduced.
It should be noted that, the flat voice coil 300 is adopted in the micro-speaker of the present utility model, so that the overall height of the speaker can be reduced, and the occupied space can be reduced, thereby reducing the volume of the audio device, and further miniaturizing the audio device.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative 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 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.
While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A micro-speaker, comprising:
a housing assembly;
the magnetic assembly is arranged in the shell assembly and comprises a first magnetic piece and a second magnetic piece which is arranged at intervals with the first magnetic piece and is opposite to the first magnetic piece, and the magnetic pole of one side, close to the second magnetic piece, of the first magnetic piece is the same as the magnetic pole of one side, close to the first magnetic piece, of the second magnetic piece;
the flat voice coil is fixedly arranged between the first magnetic piece and the second magnetic piece, an installation gap is formed between the flat voice coil and the first magnetic piece or between the flat voice coil and the second magnetic piece, a north-south magnetic pole can be formed when the flat voice coil is electrified, a north magnetic pole of the flat voice coil faces the second magnetic piece when the south magnetic pole of the flat voice coil faces the first magnetic piece, and a south magnetic pole of the flat voice coil faces the second magnetic piece when the north magnetic pole of the flat voice coil faces the first magnetic piece; and
the vibration assembly is arranged in the shell assembly and comprises a vibrating diaphragm connected with the shell assembly and a magnetizable body connected to the vibrating diaphragm, and at least part of the magnetizable body is movably arranged in the installation gap.
2. The micro-speaker of claim 1, wherein the magnetizable body is made of iron, cobalt or nickel.
3. The micro-speaker of claim 1, wherein the flat voice coil wire is wound with an avoidance region, the magnetizable body includes a first magnetizable portion, and a second magnetizable portion connected to the first magnetizable portion, the first magnetizable portion is located in the mounting gap, and the second magnetizable portion is disposed in the avoidance region.
4. A micro-speaker as claimed in claim 3, wherein the first magnetic member is provided with a first middle hole, the flat voice coil and the second magnetic member are formed with the installation gap therebetween, and the second magnetizable portion is further provided to pass through the first middle hole.
5. The micro-speaker of claim 4, wherein the second magnetic member is provided with a second center hole coaxially disposed with the first center hole, and the housing assembly is provided with an acoustic exit hole opposite to the second center hole.
6. The micro-speaker of claim 1, wherein the wires of the flat voice coil form a spiral structure, and a length direction of an axis of the spiral structure is the same as a spacing direction of the first magnetic member and the second magnetic member.
7. The micro-speaker of claim 1, wherein the housing assembly is provided with tuning holes, and tuning nets are provided at the tuning holes.
8. The micro-speaker of claim 1, wherein the housing assembly comprises a bracket and a cover body covering the bracket, the first magnetic member is fixed to the inner side of the bracket, and the second magnetic member is fixed to the inner side of the cover body.
9. The micro-speaker of claim 8, wherein a fixing ring is connected to an outer periphery of the diaphragm, the fixing ring is disposed on the support, and the cover presses on the fixing ring.
10. An audio device comprising a micro-speaker according to any of the preceding claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320024830.2U CN219322571U (en) | 2023-01-04 | 2023-01-04 | Micro speaker and audio device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320024830.2U CN219322571U (en) | 2023-01-04 | 2023-01-04 | Micro speaker and audio device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219322571U true CN219322571U (en) | 2023-07-07 |
Family
ID=87020905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320024830.2U Active CN219322571U (en) | 2023-01-04 | 2023-01-04 | Micro speaker and audio device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219322571U (en) |
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2023
- 2023-01-04 CN CN202320024830.2U patent/CN219322571U/en active Active
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