An ultrathin large-amplitude micro loudspeaker

Abstract

The utility model discloses a kind of ultra-thin large-amplitude micro loudspeakers, including cooperation magnetic circuit unit and sounding unit, the sounding unit and the magnetic circuit unit are connected by support, the sounding unit includes voice coil and diaphragm, the support is annular and the diaphragm cooperation, the magnetic circuit unit includes magnetic bowl, the central magnet is provided in the middle part of the magnetic bowl, the side magnet is also fixed on the both sides of the central magnet on the magnetic bowl, the side magnet top is also fixed with side magnetic wick, the support and the magnetic bowl cooperation form acoustic cavity;By top ball top middle film is changed from original and voice coil top bonding to annular insertion, FPC board position is changed from original voice coil bottom to and the side surface of voice coil is pasted, magnetic circuit unit and support pedestal bottom are stepped type collocation, under the premise of not affecting loudspeaker sounding effect, three cooperation makes that plate loudspeaker thickness can be reduced by about 25% compared with original design.

Description

Technical Field

[0001] This utility model relates to the field of loudspeaker technology, and in particular to an ultra-thin, large-amplitude micro loudspeaker. Background Technology

[0002] Miniature speakers used in mobile terminals (including mobile phones, tablets, computers, etc.) in daily life are usually plate-shaped speakers composed of a diaphragm, voice coil, support, and magnetic circuit system. For example, patent document CN214591957U discloses a large-amplitude miniature speaker, which places a centering support plate on the outside of the voice coil, so that the centering support plate does not occupy the vibration space of the voice coil. That is, it can effectively increase the vibration space of the voice coil without changing the overall structure of the miniature speaker, thereby increasing the amplitude of the miniature speaker and amplifying the sound. However, with the improvement of technology, these microelectronic mobile terminal devices are becoming more and more integrated, and the requirements for the thinness and lightness of the speakers in mobile terminals are becoming more and more demanding. The drawback of the above solution is that it starts from improving the loudness of the speaker. Although it optimizes the space utilization efficiency of the plate speaker when it is emitting sound, it still cannot reduce the size and thickness of the plate speaker, making it difficult to meet the needs of thinner and lighter speakers. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, the technical problem to be solved by this utility model is to propose an ultra-thin large amplitude micro loudspeaker, so as to further reduce the thickness and volume of the loudspeaker without affecting the original sound effect and sound quality.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] This utility model provides an ultra-thin, large-amplitude miniature loudspeaker, comprising a cooperating magnetic circuit unit and a sound-generating unit. The sound-generating unit and the magnetic circuit unit are connected by a bracket. The sound-generating unit includes a voice coil and a diaphragm. The bracket is annular and cooperates with the diaphragm. The magnetic circuit unit includes a magnetic cup with a central magnet in the center. Side magnets are fixed on both sides of the central magnet on the magnetic cup. A magnetic gap is formed between the central magnet and the side magnets, cooperating with the voice coil. A side magnetic core is fixed on the top of the side magnet. The bracket and the magnetic cup cooperate to form a sound cavity. To further reduce the thickness and volume of the loudspeaker, the following three aspects are mainly considered:

[0006] (1) The sound-generating unit further includes a dome center patch that cooperates with the voice coil and the diaphragm. The dome center patch is fixedly provided with an extension that cooperates with the diaphragm. The top of the voice coil is embedded into the extension and bonded to the diaphragm. After the extension is bonded to the diaphragm, the surface of the dome center patch is flush with the surface of the diaphragm.

[0007] (2) The side magnetic core and the side magnet form a stepped portion on opposite sides of the bracket, the bottom of the bracket and the stepped portion are engaged in a stepped manner, and the other opposite sides of the side magnetic core are embedded in the bracket;

[0008] (3) The sound cavity is provided with FPC plates that cooperate with the voice coil at both ends near the side magnet, and the FPC plates are attached to the side of the voice coil.

[0009] The beneficial effects of this utility model are as follows:

[0010] (1) In this case, the thickness of the dome 23, the thickness of the side magnetic core 15 and the thickness of the FPC board 5 are reduced by changing the original bonding of the dome 23 to the top of the voice coil, changing the position of the FPC board from the bottom of the voice coil to the side of the voice coil, and the magnetic circuit unit and the bottom of the bracket are arranged in a stepped manner. Without affecting the sound effect of the loudspeaker, the three factors work together to reduce the thickness of the plate loudspeaker by about 25% compared with the original design.

[0011] (2) The magnetic bowl has small holes at both ends that fit the sound cavity, so as to increase the air permeability of the sound cavity through the small holes of the mesh cover, adjust the air permeability, enhance the internal air flow circulation, enhance the sound quality of the speaker, and improve the sound quality of the sound hole. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of an ultra-thin, large-amplitude micro loudspeaker provided in a specific embodiment of this utility model;

[0013] Figure 2 yes Figure 1 The cross-sectional view of aa;

[0014] Figure 3 yes Figure 1 Cross-sectional view of bb;

[0015] Figure 4 This is an exploded view of an ultra-thin, large-amplitude micro loudspeaker provided in a specific embodiment of this utility model;

[0016] In the picture:

[0017] 1. Magnetic circuit unit; 11. Magnetic bowl; 12. Central magnet; 13. Side magnet; 14. Magnetic gap; 15. Side magnetic core; 16. Stepped section; 17. Top magnetic core; 111. Mesh cover hole; 151. Groove; 18. Bottom sticker; 112. Bottom hole;

[0018] 2. Sound unit; 21. Voice coil; 22. Diaphragm; 23. Dome mount; 231. Extension section; 221. Surround;

[0019] 3. Support; 31. Limiting piece; 32. Embedding slot;

[0020] 4. Acoustic cavity;

[0021] 5. FPC board. Detailed Implementation

[0022] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] This application further improves the thinness and lightness of plate-shaped loudspeakers commonly used in mobile terminals (such as mobile phones, computers, tablets, and other electronic devices). Without reducing the sound quality and loudness of the original plate-shaped loudspeaker, it further compresses the volume and thickness of the plate-shaped loudspeaker, optimizing its space utilization efficiency to meet users' demands for thinner and lighter designs. This utility model provides an ultra-thin, large-amplitude miniature loudspeaker. The main structure of the loudspeaker includes a cooperating magnetic circuit unit 1 and a sound-generating unit 2, connected by a bracket 3. The sound-generating unit 2 includes a voice coil 21 and a diaphragm 22. The bracket 3 is annular and cooperates with the diaphragm 22. The magnetic circuit unit 1 includes a magnetic cup 11 with a central magnet 12 in the center. Side magnets 13 are also fixed on both sides of the central magnet 12 on the magnetic cup 11. The central magnet 12 and the side magnets 13... A magnetic gap 14 is formed between the magnets 13 and 21, and a magnetic core 15 is fixed to the top of the magnet 13. A magnetic core 17 is fixed to the top of the magnet 12. A bottom plate 18 is also included, which cooperates with the magnet 12. A bottom hole 112 is opened in the magnetic cup 11, which cooperates with the bottom plate 18. The bottom plate 18 is fixedly connected to the bottom of the magnet 12. The bracket 3 and the magnetic cup 11 cooperate to form a sound cavity 4. Thus, the magnetic cup 11, the magnet 12, and the magnet 13 form the magnetic circuit structure of the loudspeaker. The magnetic core 15, the magnetic core 17, and the bottom plate 18 further prevent magnetic leakage in the magnetic circuit structure. At the same time, the voice coil 21 and the diaphragm 22 constitute the basic sound-producing structure. In this way, the magnetic circuit structure can drive the voice coil 21 to vibrate, which in turn drives the diaphragm 22 to vibrate and produce sound. Based on this, this invention mainly combines and coordinates three aspects to reduce the overall thickness and volume of the loudspeaker. Specifically:

[0024] (1) From the perspective of the dome center patch 23: The sound unit 2 also includes a dome center patch 23 that cooperates with the voice coil 21 and the diaphragm 22. The dome center patch 23 helps to improve the high frequency response and directivity of the loudspeaker. Currently, the dome center patch 23 in the loudspeaker is generally located between the top of the voice coil 21 and the diaphragm 22. Therefore, in order to reduce the thickness of the loudspeaker caused by the dome center patch 23, the dome center patch 23 is fixed with an extension 231 that cooperates with the diaphragm 22. The top of the voice coil 21 is embedded into the extension 231 and bonded to the diaphragm 22. In this way, the thickness of the dome center patch 23 can be reduced, and the connection between the voice coil 21, the diaphragm 22 and the dome center patch 23 can be made firm without affecting the overall sound production of the sound unit. At the same time, after the extension 231 is bonded to the diaphragm 22, the surface of the dome center patch 23 is flush with the surface of the diaphragm 22.

[0025] (2) From the perspective of the cooperation between the magnetic circuit unit 1 and the bracket 3, the current speaker bracket 3 is mainly directly fixed to the side magnetic core 15 of the magnetic circuit unit 1. Therefore, this case can reduce the thickness of the speaker by reducing the size of the magnetic core 15. Specifically, the side magnetic core 15 and the side magnet 13 form a stepped part 16 on opposite sides of the bracket 3. The bottom of the bracket 3 is in step-like cooperation with the stepped part 16. The other opposite sides of the side magnetic core 15 are embedded in the bracket 3. In this way, while facilitating assembly, the bottom of the bracket 3 can be directly pressed against the top edge of the side magnet 13 to block the side magnetic core 15, while the other two sides of the side magnetic core 15 are embedded in the bracket 3. In this way, the side magnetic core 15 is completely hidden inside the speaker body. This can ensure that the side magnetic core 15 is prevented from leaking magnetic flux, and the magnetic circuit unit 1 and the bracket are in good condition. While ensuring a stable connection, the thickness of the side magnetic core 15 is also reduced in terms of the overall thickness of the speaker. Furthermore, in order not to affect the normal sound output of the sound unit 2, a folded ring 221 is also provided on the diaphragm 22. When the protrusion of the folded ring 221 faces outward of the speaker, it will increase the thickness of the speaker. Therefore, when the protrusion of the folded ring 221 faces inward of the sound cavity 4, the side magnetic core 15 is also provided with a groove 151 that matches the protrusion of the folded ring 221. In this way, during the vibration of the diaphragm 22, the side magnetic core 15 will not interfere with the vibration of the diaphragm 22 and will not affect the normal sound output. Preferably, in the magnetic circuit unit 1, the edge of the bottom pad 18 is stepped and matches the edge of the bottom hole 112. The surface of the bottom pad 18 is flush with the bottom of the magnetic cup 11, so as to further effectively compress the thickness of the speaker without affecting the magnetic leakage.

[0026] (3) From the perspective of FPC board 5: FPC board 5 is an important structure for realizing the connection between voice coil 21 and external circuit and signal transmission. Currently, FPC board 5 is mainly set at the top or bottom of voice coil. Therefore, in order to further reduce the thickness of the speaker, FPC board 5 is set at both ends of the cavity 4 near the side magnet 13 to cooperate with voice coil 21. FPC board 5 is attached to the side of voice coil 21. In this way, the thickness of FPC board 5 can be further reduced in the overall thickness of the speaker without affecting the connection between FPC board 5 and voice coil 21.

[0027] In summary, this design addresses the issue by reducing the thickness of the dome core 23, the edge magnetic core 15, and the FPC board 5. Through comprehensive and coordinated efforts, the thickness of the panel speaker is effectively reduced without affecting its sound output. This results in a reduction of approximately 25% in the thickness of the panel speaker compared to the original design.

[0028] After the above structural adjustments, when the speaker emits sound, the voice coil 21 drives the diaphragm 22 to vibrate along the magnetic gap 14. To ensure the stability of the voice coil vibration, two limiting plates 31 are also included. The limiting plates 31 are set between the bracket 3 and the magnetic cup 11. The two limiting plates 31 are set near the two ends of the side magnet 13. One side of the limiting plate 31 is fixedly connected to the inner side of the bracket 3, and the other side is close to or attached to the side of the voice coil 21 to limit the vibration range of the voice coil. To further improve the sound quality, the magnetic cup 11 has mesh holes 111 at both ends near the side magnet 13 that cooperate with the sound cavity 4. The mesh holes 111 increase the air permeability of the sound cavity 4. By adjusting the air permeability, the internal airflow circulation is enhanced, thereby enhancing the sound quality of the speaker.

[0029] This utility model has been described through preferred embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. This utility model is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims of this application are all within the protection scope of this utility model.

Claims

1. An ultra-thin, large-amplitude micro loudspeaker, comprising a magnetic circuit unit (1) and a sound-generating unit (2) cooperating with each other, the sound-generating unit (2) and the magnetic circuit unit (1) being connected by a bracket (3), the sound-generating unit (2) comprising a voice coil (21) and a diaphragm (22), the bracket (3) being annular and cooperating with the diaphragm (22), the magnetic circuit unit (1) comprising a magnetic cup (11), a central magnet (12) disposed in the middle of the magnetic cup (11), and side magnets (13) fixed on both sides of the central magnet (12) on the magnetic cup (11), a magnetic gap (14) cooperating with the voice coil (21) being formed between the central magnet (12) and the side magnets (13), and a side magnetic core (15) fixed on the top of the side magnets (13), the bracket (3) and the magnetic cup (11) cooperating to form a sound cavity (4), characterized in that, The sound-generating unit (2) further includes a dome center patch (23) that cooperates with the voice coil (21) and the diaphragm (22). The dome center patch (23) is fixed with an extension (231) that cooperates with the diaphragm (22). The top of the voice coil (21) is embedded into the extension (231) and bonded to the diaphragm (22). After the extension (231) is bonded to the diaphragm (22), the surface of the dome center patch (23) is flush with the surface of the diaphragm (22). The side magnetic core (15) forms a stepped portion (16) with the side magnet (13) on the opposite sides of the bracket (3). The bottom of the bracket (3) and the stepped portion (16) are in a stepped fit. The other opposite sides of the side magnetic core (15) are embedded into the bracket (3). The sound cavity (4) has FPC plates (5) that cooperate with the voice coil (21) at both ends near the side magnet (13), and the FPC plates (5) are attached to the side of the voice coil (21).

2. The ultra-thin, large-amplitude micro loudspeaker according to claim 1, characterized in that, The top of the central magnet (12) is also fixed with a top magnetic core (17).

3. The ultra-thin, large-amplitude miniature loudspeaker according to claim 1, characterized in that: The magnetic bowl (11) has mesh holes (111) at both ends near the side magnet (13) that cooperate with the sound cavity (4) to increase the air permeability of the sound cavity (4) through the mesh holes (111).

4. The ultra-thin, large-amplitude micro loudspeaker according to claim 2, characterized in that, The diaphragm (22) is also provided with a folded ring (221), the protrusion of the folded ring (221) faces into the sound cavity (4), and the side magnetic core (15) is also provided with a groove (151) that cooperates with the protrusion of the folded ring (221).

5. The ultra-thin, large-amplitude micro loudspeaker according to claim 4, characterized in that, It also includes two limiting pieces (31), which are disposed between the bracket (3) and the magnetic bowl (11), and the two limiting pieces (31) are disposed near the two ends of the side magnet (13).

6. The ultra-thin, large-amplitude micro loudspeaker according to claim 5, characterized in that, It also includes a base sticker (18) that cooperates with the central magnet (12). The magnetic bowl (11) has a bottom hole (112) that cooperates with the base sticker (18). The edge of the base sticker (18) is stepped and cooperates with the edge of the bottom hole (112). The surface of the base sticker (18) is flush with the bottom of the magnetic bowl (11).

Images