Multi-magnetic-circuit miniature loudspeaker

Abstract

The utility model discloses a multi-magnetic-circuit miniature loudspeaker, which comprises a base, a magnetic circuit unit is arranged in the base, a sounding unit matched with the magnetic circuit unit is further arranged at the top of the base, the magnetic circuit unit comprises a central magnetic block, edge magnetic blocks matched with each other are arranged on the four sides of the central magnetic block, and the edge magnetic blocks are arranged on the periphery of the central magnetic block. Magnetic gaps are formed between the four side magnetic blocks and the central magnetic block, a central magnetic core is further fixedly arranged at the top of the central magnetic block, and a top magnet is fixedly arranged at the top of the central magnetic core; the sound production unit comprises a voice coil and a vibrating diaphragm, the vibrating diaphragm is fixedly connected with the voice coil, a multi-magnetic-circuit structure is mainly formed by using a vertically arranged magnetic block group (comprising a central magnetic block, a side magnetic block and a top magnet), the height of a magnetic gap is increased while a magnetic field is strengthened, and the distribution of the magnetic field is further guided through a central magnetic core, a side magnetic core and a magnetic cover, so that the sound production efficiency is improved. Therefore, the voice coil is enabled to perform large-displacement vibration in the magnetic gap, and the sound output of the loudspeaker is improved.

Description

Technical Field

[0001] This utility model relates to the field of loudspeaker technology, and in particular to a multi-magnetic-circuit miniature loudspeaker. Background Technology

[0002] A planar loudspeaker is a common sound-producing unit in headphones and thin-surface speakers. Its basic structure includes a vibrating part, a magnetic circuit part, and a structural part. The vibrating part mainly includes a diaphragm and a voice coil. The diaphragm and voice coil are connected. When an alternating current is passed through, the voice coil moves in the magnetic field and drives the diaphragm to vibrate, thus converting the electrical signal into a mechanical vibration signal. When miniature loudspeakers are used in electronic products, they are limited by installation space and size, making it particularly difficult to increase the sound volume. Therefore, there is a need for a miniature loudspeaker that can output a larger sound volume. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, the technical problem to be solved by this utility model is to propose a multi-magnetic circuit micro loudspeaker. By setting a multi-magnetic circuit structure in the flat micro loudspeaker, the voice coil can generate a large displacement and drive the voice coil to vibrate, thereby realizing the loudspeaker's louder sound output.

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

[0005] This utility model provides a multi-magnetic circuit miniature loudspeaker, including a base, a magnetic circuit unit disposed within the base, and a sound-generating unit cooperating with the magnetic circuit unit on the top of the base. The magnetic circuit unit includes a central magnetic block, with four cooperating side magnetic blocks disposed on the four sides of the central magnetic block, forming a magnetic gap between the four side magnetic blocks and the central magnetic block. A central magnetic core is fixedly disposed on the top of the central magnetic block, and a top magnet is fixedly disposed on the top of the central magnetic core. The sound-generating unit includes a voice coil and a diaphragm, the diaphragm and the voice coil being fixedly connected. The voice coil is annular in shape and disposed within the magnetic gap. FPC boards cooperating with the voice coil are disposed at both ends of the side magnetic core in the length direction within the base to facilitate connection to external circuits. Auxiliary diaphragms cooperating with the voice coil are also fixedly disposed at both ends of the side magnetic core in the length direction within the base to further improve the sound quality of the loudspeaker.

[0006] The magnetic circuit unit also includes a side magnetic core, which is a ring shape that cooperates with the four side magnetic blocks. One end of the side magnetic core near the central magnetic block is fixedly connected to the four side magnetic blocks. A magnetic cover is also fixedly provided at the bottom of the central magnetic block and the four side magnetic blocks. The end of the side magnetic core away from the central magnetic block extends outward to the outside of the speaker to form a connecting part, which is fixedly connected to the base.

[0007] The diaphragm consists of two pieces, which are arranged in a nested ring around the central magnet. A frame is also provided between the two diaphragms. The frame is Z-shaped, with the top of the frame fixing the two diaphragms together and the bottom of the frame fixing the voice coil together. A dome is also fixed between the two diaphragms at the top of the frame. A rectangular folded ring is provided on the diaphragm.

[0008] It also includes a base frame disposed at the edge of the connecting part. The base frame is annular, with its top fixedly connected to the diaphragm and its bottom fixedly connected to the connecting part.

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

[0010] This invention utilizes a vertically arranged magnetic block group (including a central magnetic block, side magnetic blocks, and a top magnet) to form a multi-magnetic circuit structure, which strengthens the magnetic field and increases the height of the magnetic gap. The central magnetic core, side magnetic core, and magnetic cover further guide the magnetic field distribution and prevent magnetic leakage. This allows the voice coil to vibrate with large displacement in the magnetic gap, thereby improving the sound output of the loudspeaker. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of a multi-magnetic-circuit miniature loudspeaker provided in a specific embodiment of this utility model;

[0012] Figure 2 This is a schematic diagram of the principle of a multi-magnetic circuit miniature loudspeaker provided in a specific embodiment of this utility model;

[0013] Figure 3 This is an exploded view of a multi-magnetic-circuit miniature loudspeaker provided in a specific embodiment of this utility model;

[0014] In the picture:

[0015] 11. Base frame; 12. FPC board;

[0016] 2. Magnetic circuit unit; 21. Central magnetic block; 22. Side magnetic block; 23. Magnetic gap; 24. Central magnetic core; 25. Top magnet; 26. Side magnetic core; 261. Connecting part; 27. Magnetic cover;

[0017] 3. Sound unit; 31. Voice coil; 32. Diaphragm; 33. Frame; 34. Dome; 321. Surround; 35. Acoustic diaphragm. Detailed Implementation

[0018] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] To enable a larger sound output from a flat-panel miniature loudspeaker, the main principle is to increase the vibration displacement of the voice coil in the magnetic circuit to increase the amplitude of the diaphragm driven by the voice coil, thereby improving the loudspeaker's sound. This invention provides a multi-magnetic-circuit miniature loudspeaker, including a base, a magnetic circuit unit 2 disposed within the base, and a sound-emitting unit 3 cooperating with the magnetic circuit unit 2 on the top of the base. The magnetic circuit unit 2 includes a central magnetic block 21, and four corresponding side magnetic blocks 22 disposed on the four sides of the central magnetic block 21. A magnetic field is formed between the four side magnetic blocks 22 and the central magnetic block 21. The magnetic gap 23 is provided, and the sound-generating unit 3 includes a voice coil 31 and a diaphragm 32. The diaphragm 32 and the voice coil 31 are fixedly connected. The voice coil 31 is ring-shaped and is disposed in the magnetic gap 23. Thus, the central magnetic block 21 and the four side magnetic blocks 22 together constitute a basic magnetic circuit system. In order to further expand the magnetic circuit and enable the voice coil 31 to vibrate and displace more significantly in the magnetic gap 23, this application mainly achieves this through two points: first, expanding the magnetic gap to give the voice coil 31 sufficient vibration space; second, optimizing the magnetic circuit structure to reduce magnetic leakage and increase the magnetic field strength.

[0020] To achieve the above two points, a central magnetic core 24 is fixedly mounted on the top of the central magnetic block 21, and a top magnet 25 is fixedly mounted on the top of the central magnetic core 24. This increases the vertical vibration displacement height of the voice coil 31, thereby increasing the magnetic circuit strength of the entire magnetic circuit unit 2 in the vertical direction. Furthermore, to prevent magnetic leakage, the magnetic circuit unit 2 also includes a side magnetic core 26, which is a ring-shaped structure that cooperates with four side magnetic blocks 22. The end of the side magnetic core 26 near the central magnetic block 21 is fixedly connected to the four side magnetic blocks 22, and a magnetic cover 27 is fixedly mounted on the bottom of the central magnetic block 21 and the four side magnetic blocks 22. In this way, the vertically arranged magnetic block group (including the central magnetic block 21, the side magnetic blocks 22, and the top magnet 25) is used to mainly form the magnetic circuit system, and the central magnetic core 24, the side magnetic core 26, and the magnetic cover 27 are used to further guide the magnetic field distribution and prevent magnetic leakage. In this way, the distribution of multiple magnetic blocks can increase the magnetic flux, making the magnetic field distribution more uniform and concentrated, thereby improving the performance of the loudspeaker. The multi-magnetic circuit structure can better guide the magnetic field, reduce magnetic field leakage, improve the utilization efficiency of the magnetic field, and provide a stronger magnetic field environment for the voice coil 31. This allows the voice coil 31 to generate a greater driving force after being energized, thereby driving the diaphragm 32 to produce a greater displacement, improving the sound pressure level and sound quality performance of the speaker. Preferably, the end of the side magnetic core 26 away from the central magnetic block 21 extends outward from the speaker to form a connecting part 261. The connecting part 261 is fixedly connected to the base to assemble the magnetic circuit unit 2 into the base.

[0021] The magnetic circuit unit 2 drives the voice coil 31 to vibrate, which in turn drives the diaphragm 32 to vibrate, thereby achieving the effect of sound production. The diaphragm 32 consists of two pieces, which are arranged in a nested ring around the central magnetic block 21. A frame 33 is also provided between the two diaphragms 32. The frame 33 is Z-shaped. The top of the frame 33 fixes the two diaphragms 32, and the bottom of the frame 33 is fixedly connected to the voice coil 31. In this way, the diaphragms 32 and the voice coil 31 are assembled with the magnetic circuit unit 2. In order to improve the sound quality of the speaker, a dome 34 is also fixed on the top of the frame 33 between the two diaphragms 32. A rectangular folded ring 321 is provided on the diaphragm 32. The dome 34 can vibrate together with the diaphragm 32, which helps to improve the high-frequency response and directivity of the sound. The dome 34 and the folded ring 321 can effectively ensure the frequency response of the speaker when it is producing sound.

[0022] To enhance the stability of the sound-generating unit 2 during sound generation, a base frame 11 is also provided at the edge of the connecting part 261. The base frame 11 is annular, with its top fixedly connected to the diaphragm 32 and its bottom fixedly connected to the connecting part 261. Thus, the diaphragm 32 is limited on the base by the base frame 11. Furthermore, FPC boards 12 that cooperate with the voice coil 31 are provided at both ends of the inner side magnetic core 26 along the length direction of the base to connect to external circuits and transmit electrical signals to the voice coil 31, so that the voice coil 31 can generate sound in the magnetic gap 23. Preferably, auxiliary diaphragms 35 that cooperate with the voice coil 31 are also fixed at both ends of the inner side magnetic core 26 along the length direction of the base. Since the auxiliary diaphragm 35 is arc-shaped, it can guide the flow of gas inside the speaker to optimize sound generation and heat dissipation.

[0023] 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. A multi-magnetic circuit miniature loudspeaker, comprising a base, wherein a magnetic circuit unit (2) is disposed within the base, and a sound-emitting unit (3) cooperating with the magnetic circuit unit (2) is further disposed on the top of the base, characterized in that: The magnetic circuit unit (2) includes a central magnetic block (21), and four sides of the central magnetic block (21) are provided with matching side magnetic blocks (22). A magnetic gap (23) is formed between the four side magnetic blocks (22) and the central magnetic block (21). A central magnetic core (24) is also fixed on the top of the central magnetic block (21), and a top magnet (25) is fixed on the top of the central magnetic core (24). The sound generating unit (3) includes a voice coil (31) and a diaphragm (32). The diaphragm (32) and the voice coil (31) are fixedly connected. The voice coil (31) is annular in shape and is disposed in the magnetic gap (23).

2. The multi-magnetic circuit miniature loudspeaker according to claim 1, characterized in that: The magnetic circuit unit (2) further includes a side magnetic core (26), which is a ring shape that cooperates with the four side magnetic blocks (22). The end of the side magnetic core (26) near the central magnetic block (21) is fixedly connected to the four side magnetic blocks (22), and the end of the side magnetic core (26) away from the central magnetic block (21) extends outward to the speaker to form a connecting part (261). The connecting part (261) is fixedly connected to the base.

3. A multi-magnetic circuit miniature loudspeaker according to claim 2, characterized in that: The bottom of the central magnetic block (21) and the four side magnetic blocks (22) are also fixed with magnetic covers (27).

4. A multi-magnetic-circuit miniature loudspeaker according to claim 2, characterized in that: The diaphragm (32) is provided with two pieces, and the two diaphragms (32) are arranged in a nested ring with the central magnet (21) as the center. A skeleton (33) is also provided between the two diaphragms (32). The skeleton (33) is Z-shaped. The top of the skeleton (33) fixes the two diaphragms (32) together, and the bottom of the skeleton (33) is fixedly connected to the voice coil (31).

5. A multi-magnetic circuit miniature loudspeaker according to claim 4, characterized in that: The top of the frame (33) is also fixed with a dome (34) between the two diaphragms (32).

6. A multi-magnetic-circuit miniature loudspeaker according to claim 4, characterized in that: A rectangular folded ring (321) is provided on the diaphragm (32).

7. A multi-magnetic circuit miniature loudspeaker according to claim 5, characterized in that: It also includes a base frame (11) disposed on the edge of the connecting part (261), the base frame (11) is annular, the top of the base frame (11) is fixedly connected to the diaphragm (32), and the bottom of the base frame (11) is fixedly connected to the connecting part (261).

8. A multi-magnetic circuit miniature loudspeaker according to claim 7, characterized in that: The base contains FPC plates (12) that cooperate with the voice coil (31) at both ends of the side magnetic core (26) along its length.

9. A multi-magnetic circuit miniature loudspeaker according to claim 8, characterized in that: The base also has auxiliary diaphragms (35) that cooperate with the voice coil (31) fixed at both ends of the side magnetic core (26) along the length direction.

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