An ultrathin vibration-reducing loudspeaker

Abstract

The utility model discloses a kind of ultra-thin vibration reduction loudspeaker, including magnetic circuit assembly and sound production component, the magnetic circuit assembly and the sound production component are connected by support, the magnetic circuit assembly includes magnet bowl and the center magnet of setting in the middle part of the magnet bowl, the sound production component includes the main sound production unit and sub sound production unit of setting in the both sides of the support, the main sound production unit includes active sound film and the voice coil of driving the vibration of active sound film, still include the shock pad between the support and the magnet bowl, the inner side of the shock pad is fixedly connected with the magnet bowl, the outer side of the shock pad is fixedly connected with the support;The sub sound production unit includes shock absorbing ring and passive sound film, through the comprehensive utilization of passive sound film, so that plate loudspeaker can guarantee sound production effect while, realize light and thin, light weight, damping, better balance between sealing property.

Description

Technical Field

[0001] This utility model relates to the field of loudspeaker technology, and in particular to an ultra-thin vibration-damping 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, bracket, and magnetic circuit system. For example, patent document TWM670893U discloses a double-sided vibration-damping speaker, which is also a thin plate-shaped double-sided speaker. Its general structure is mainly through a second speaker base 13 as a connection, with relatively independent sound-producing units set on both sides of the second speaker base 13. This structure is easy to install and can produce sound from both sides, thereby improving the sound production efficiency. However, the technical solution described in this patent document has a drawback: its structure is still similar to two plate-shaped speakers stacked together, i.e., a "back-to-back" structure, such as the double voice coil and double circuit spider described in the document. This results in a plate-shaped speaker with this structure having a large number of complex structures while ensuring sound production efficiency. It is difficult to balance sealing and vibration damping performance. At the same time, it is also difficult to effectively control the volume and thickness of the speaker. In other words, due to physical limitations, it is difficult to overcome the thickness bottleneck, making it impossible for plate-shaped speakers to meet the requirements of thinner and lighter weight. 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 an ultra-thin vibration-damping loudspeaker, so that the plate loudspeaker can achieve the requirements of thinner and lighter size and thickness while ensuring sound production efficiency, and also ensure good sealing and vibration damping performance.

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

[0005] This utility model provides an ultra-thin vibration-damping loudspeaker, comprising a loudspeaker body, which includes a magnetic circuit assembly and a sound-generating assembly. The magnetic circuit assembly and the sound-generating assembly are connected by a bracket. The magnetic circuit assembly includes a magnetic cup and a central magnet disposed in the middle of the magnetic cup. To prevent magnetic leakage, a washer is fixed to the top of the central magnet. The sound-generating assembly includes a main sound-generating unit and a secondary sound-generating unit disposed on both sides of the bracket. The main sound-generating unit includes an active diaphragm and a voice coil that drives the active diaphragm to vibrate. An FPC board is disposed on the top of the voice coil, and the voice coil is connected to an external circuit through the FPC board to ensure lossless transmission of audio signals. The magnetic cup is provided with a washer and a washer. The system includes four side magnets that cooperate with each other, forming a magnetic gap between the side magnets and the central magnet that cooperates with the voice coil. The bracket has four corner supports near the auxiliary sound unit that cooperate with the auxiliary sound unit. It also includes a damping plate disposed between the bracket and the magnetic cup, with the inner side of the damping plate fixedly connected to the magnetic cup and the outer side fixedly connected to the bracket. The auxiliary sound unit includes a damping pressure ring and a passive diaphragm. The four corners of the damping pressure ring have pressure ring grooves that cooperate with the foot. The damping pressure ring is embedded in the bracket along the foot. The edges of the active and passive diaphragms extend along the side of the bracket to form an edging around the bracket.

[0006] To achieve good vibration damping while maintaining an ultra-thin structure, the four corners of the damping sheet are provided with insert grooves that cooperate with the support legs, the side magnet is provided with magnetic steps that cooperate with the damping sheet, the inner side of the damping sheet is fixedly connected to the magnetic steps, the outer side of the damping sheet is fixed between the bracket and the damping pressure ring, and the edge extension length of the passive acoustic diaphragm does not exceed the thickness of the damping pressure ring.

[0007] The beneficial effects of this utility model are as follows:

[0008] This design utilizes a dual-sided sound-generating structure with both an active and a passive diaphragm. The active diaphragm vibrates using only a single voice coil, while the passive diaphragm vibrates due to the positive and negative pressure within the acoustic cavity (including an inner cavity or a combination of an inner and outer cavity, hereinafter the same). This enhances low-frequency characteristics and achieves dual-sided sound generation. This avoids the uncontrollable thickness and volume of the speaker caused by excessive structural elements. Furthermore, this structure requires excellent sealing within the acoustic cavity; therefore, the active and passive diaphragms on both sides are edge-sealed diaphragms.

[0009] Furthermore, in this case, the inner side of the damping plate and the edge of the magnetic cup are fitted with stepped magnets, and the outer side is embedded between the bracket and the ring pressure block. The bracket guides and ensures that the damping plate is concentric. The magnetic cup and the ring damping plate are concentrically combined. The magnetic cup and the bracket do not directly contact each other, so as to further reduce the thickness of the speaker. At the same time, the damping plate is used to connect the magnetic circuit assembly to the bracket and the ring pressure block, so that during the sound production process, the vibration of the magnetic circuit assembly can be transmitted to the damping ring. The damping ring and the bracket further transmit the vibration to the passive diaphragm for filtering and absorption. That is, the back-fitted edge-wrapped passive diaphragm and the damping ring are connected in parallel for vibration damping. This allows the passive diaphragm to achieve the above-mentioned ultra-thin effect while also providing vibration damping for the speaker.

[0010] In summary, this case demonstrates how the comprehensive utilization of passive acoustic membranes allows panel loudspeakers to achieve a good balance between thinness, light weight, vibration reduction, and sealing while ensuring sound quality. Attached Figure Description

[0011] Figure 1 This is an exploded view of an ultra-thin vibration-damping loudspeaker provided in Embodiment 1 of this utility model.

[0012] Figure 2 This is a schematic diagram of the overall structure of an ultra-thin vibration-damping loudspeaker provided in Embodiment 1 of this utility model;

[0013] Figure 3 yes Figure 2 Schematic diagram of the cross section of aa;

[0014] Figure 4 yes Figure 2 Schematic diagram of the cross-section of bb;

[0015] Figure 5 This is an exploded view of an ultra-thin vibration-damping loudspeaker provided in Embodiment 2 of this utility model.

[0016] Figure 6 This is a schematic diagram of the overall (without external sound bowl) structure of an ultra-thin vibration-damping loudspeaker provided in Embodiment 2 of this utility model;

[0017] Figure 7 This is a schematic diagram of the overall structure of an ultra-thin vibration-damping loudspeaker provided in Embodiment 2 of this utility model;

[0018] Figure 8 yes Figure 7 Schematic diagram of the cross-section of cc;

[0019] In the picture:

[0020] 1a. Loudspeaker body; 1. Magnetic circuit assembly; 11. Magnetic cup; 12. Center magnet; 13. Side magnet; 14. Magnetic gap; 131. Magnetic scale; 1b. Outer cup;

[0021] 2. Sound-generating components; 21. Main sound-generating unit; 22. Secondary sound-generating unit; 211. Active diaphragm; 212. Voice coil; 221. Damping ring; 222. Passive diaphragm; 2211. Ring groove; 223. Edge wrapping; 224. Diaphragm inlay; 225. Surround; 1a1. Inner acoustic cavity; 1b1. Outer acoustic cavity; 2241. Protrusion; 2212. Connecting groove;

[0022] 3. Bracket; 31. Support leg;

[0023] 4. Damping pads; 41. Pad grooves;

[0024] 5. FPC board;

[0025] 6. Huasi. Detailed Implementation

[0026] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] To ensure good sound production efficiency of the panel loudspeaker while achieving a thinner and lighter design in terms of volume and thickness, and possessing good sealing and vibration damping performance, this utility model provides an ultra-thin vibration-damping loudspeaker. Specifically, it includes a loudspeaker body 1a, which includes a magnetic circuit assembly 1 and a sound-generating assembly 2. The magnetic circuit assembly 1 and the sound-generating assembly 2 are connected by a bracket 3. The magnetic circuit assembly 1 includes a magnetic cup 11 and a central magnet 12 disposed in the middle of the magnetic cup 11, thus forming the most basic sound-generating structure of the loudspeaker. To achieve better sound production efficiency, the sound-generating assembly 2 includes a main sound-generating unit 21 and a secondary sound-generating unit 22 disposed on both sides of the bracket 3. At the same time, to achieve a thinner and lighter design in terms of volume and thickness, the main sound-generating unit 21 drives the secondary sound-generating unit 22 to produce sound.

[0028] Example 1: As Figures 1-4As shown, the main sound-generating unit 21 includes an active diaphragm 211 and a voice coil 212 that drives the active diaphragm 211 to vibrate. The magnetic cup 11 is provided with side magnets 13 that cooperate with the four sides of the central magnet 12. A magnetic gap 14 is formed between the side magnets 13 and the central magnet 12, which cooperates with the voice coil 212. To assemble the magnetic cup 11 on the support 1, a damping plate 4 is also included, disposed between the support 3 and the magnetic cup 11. The inner side of the damping plate 4 is fixedly connected to the magnetic cup 11. The outer side of the damping sheet 4 is fixedly connected to the bracket 3; preferably, a washer 6 is also fixedly provided on the top of the central magnet 12 to reduce magnetic leakage of the magnetic circuit assembly 1. The FPC board 5 and the washer 6 are provided with matching assembly notches. At the same time, the top of the voice coil 212 is also provided with an FPC board 5. The voice coil 212 is connected to the external circuit through the FPC board 5 to ensure lossless transmission of audio signals. During assembly, the voice coil 212 is located in the magnetic gap 14, and then the active acoustic diaphragm 211 is driven to vibrate and produce sound through the voice coil 212.

[0029] With the main sound unit 21 functioning normally, in order for the main sound unit 21 to drive the auxiliary sound unit 22 to produce sound, the auxiliary sound unit 22 includes a damping ring 221 and a passive diaphragm 222.

[0030] The bracket 3 has four corners near the auxiliary sound unit 22 with feet 31 that cooperate with the auxiliary sound unit 22. The four corners of the damping ring 221 have ring grooves 2211 that cooperate with the feet 31. During assembly, the damping ring 221 is embedded into the bracket 3 along the feet 31. The edges of the active diaphragm 211 and the passive diaphragm 222 extend along the side of the bracket 3 to form an edging 223 around the bracket 3. Thus, the active diaphragm 211 and the passive diaphragm 222 cover opposite sides of the bracket 3, improving the speaker's sealing performance and creating a relatively sealed inner cavity 1a1. When the voice coil 212 drives the active diaphragm 211 to vibrate, the air pressure inside the inner cavity 1a1 changes. Specifically, when the active diaphragm 211 moves towards the passive diaphragm 222, a positive pressure is generated inside the inner cavity 1a1, meaning the pressure inside the inner cavity 1a1 is greater than the external air pressure, causing the passive diaphragm 222 to vibrate more effectively. The active diaphragm 222 moves outward; conversely, when the active diaphragm 211 moves away from the passive diaphragm 222, a negative pressure is generated in the inner cavity 1a1, that is, the pressure inside the inner cavity 1a1 is less than the external air pressure, causing the passive diaphragm 222 to move inward. In other words, the vibration of the passive diaphragm 222 is entirely driven by the air pressure change inside the inner cavity 1a1. In this way, effective sound production can be achieved using only one voice coil 212 without adding additional voice coil 212 and related magnetic circuit structures. This can effectively control the thickness and volume of the loudspeaker, ensuring the requirements of thinness and lightness, and reducing the thickness by about 30% to 50%. At the same time, the edging 223 can provide restoring force while ensuring sealing. This increases the sound-producing area through the passive diaphragm 222, enhancing the ability to push air, and can significantly increase the low-frequency characteristics of the sound to achieve better two-sided sound production.

[0031] As described above, to ensure good vibration damping while maintaining a thin and lightweight speaker, the four corners of the damping plate 4 are provided with insert grooves 41 that mate with the support legs 31. The side magnet 13 is provided with magnetic steps 131 that mate with the damping plate 4. The inner side of the damping plate 4 is fixedly connected to the magnetic steps 131. During assembly, the insert grooves 41 of the damping plate 4 can be inserted into the bracket 3 along the support legs 31. Then, the damping pressure ring 221 is inserted into the bracket 3 along the support legs 31. In this way, the outer side of the damping plate 4 is fixed between the bracket 3 and the damping pressure ring 221. Thus, the passive diaphragm 222, the damping plate 4, and the damping pressure ring 221 together constitute a vibration damping system, which can effectively dampen the sound. The vibration of the magnetic circuit assembly 1 is transmitted to the damping ring 221 through the damping plate 4. At the same time, the extension length of the edge 223 of the passive diaphragm 222 does not exceed the thickness of the damping ring 221. In this way, the vibration from the bracket 3 and the damping ring 221 can be transferred to the passive diaphragm 222, thereby effectively filtering the vibration and converting the vibration into the vibration of the passive diaphragm 222. This can effectively suppress stray resonance, improve sound characteristics, and reduce vibration. Furthermore, the bracket 3, damping plate 4, and damping ring 221, through the stacked embedded design, can effectively control the overall thickness of the speaker, achieving an effective balance between vibration reduction and good sound production efficiency in a small space.

[0032] Preferably, in order to ensure the sound output effect of the active diaphragm 211 and the passive diaphragm 222, a diaphragm inlay 224 is provided in the middle of the active diaphragm 211 and the passive diaphragm 222. The diaphragm inlay 224 is also provided with protrusions 2241 arranged in a matrix. The diaphragm inlay 224 is made of aluminum-magnesium alloy to increase the structural strength of the speaker. A folding ring 225 is also provided on the active diaphragm 211 and the passive diaphragm 222 along the edge of the support 3.

[0033] Example 2: In Example 1, since the damping ring 221 has no opening, the volume of the speaker body 1a is very small, and the inner acoustic cavity 1a1 of the speaker body 1a is also very small. This results in a smaller change in air pressure within the inner acoustic cavity 1a1, which limits the amplitude of the active diaphragm 211 and the passive diaphragm 222, thereby limiting the sound output of the speaker. Figures 5-8 As shown, unlike Embodiment 1, to address this problem, the sound-generating component 2 of Embodiment 2 further includes an outer acoustic bowl 1b that cooperates with the speaker body 1a. The outer acoustic bowl 1b is annular, and its inner side is fixedly connected to the side wall of the speaker body 1a. To ensure sealing, the edges of the outer acoustic bowl 1b and the speaker body 1a are stepped and connected by adhesive. At the same time, an outer acoustic cavity 1b1 is provided between the outer acoustic bowl 1b and the speaker body 1a. Several connecting grooves 2212 are provided on the four sides of the shock-absorbing pressure ring 221 to connect the outer acoustic cavity 1b1 and the inner acoustic cavity 1a1 of the speaker body 1a. This relatively enlarges the inner acoustic cavity 1a1 to ensure the amplitude of the active diaphragm 211 and the passive diaphragm 222, thereby improving the sound quality of the speaker.

[0034] 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 vibration-damping loudspeaker, comprising a loudspeaker body (1a), the loudspeaker body (1a) comprising a magnetic circuit assembly (1) and a sound-generating assembly (2), the magnetic circuit assembly (1) and the sound-generating assembly (2) being connected by a bracket (3), the magnetic circuit assembly (1) comprising a magnetic cup (11) and a central magnet (12) disposed in the middle of the magnetic cup (11), characterized in that, The sound-generating assembly (2) includes a main sound-generating unit (21) and a secondary sound-generating unit (22) disposed on both sides of the support (3). The main sound-generating unit (21) includes an active acoustic diaphragm (211) and a voice coil (212) that drives the active acoustic diaphragm (211) to vibrate. The magnetic cup (11) is provided with side magnets (13) that cooperate with the four sides of the central magnet (12). A magnetic gap (14) that cooperates with the voice coil (212) is formed between the side magnets (13) and the central magnet (12). The four corners of the support (3) near the secondary sound-generating unit (22) are fixed with legs (31) that cooperate with the secondary sound-generating unit (22). It also includes a shock-absorbing plate (4) disposed between the bracket (3) and the magnetic bowl (11), the inner side of the shock-absorbing plate (4) being fixedly connected to the magnetic bowl (11), and the outer side of the shock-absorbing plate (4) being fixedly connected to the bracket (3); The auxiliary sound unit (22) includes a shock-absorbing pressure ring (221) and a passive acoustic diaphragm (222). The four corners of the shock-absorbing pressure ring (221) are provided with pressure ring grooves (2211) that cooperate with the support (31). The shock-absorbing pressure ring (221) is embedded in the bracket (3) along the support (31). The edges of the active acoustic diaphragm (211) and the passive acoustic diaphragm (222) extend along the side of the bracket (3) to form a edging (223) around the bracket (3).

2. The ultra-thin vibration-damping loudspeaker according to claim 1, characterized in that, The four corners of the damping plate (4) are provided with plate grooves (41) that cooperate with the support (31). The side magnet (13) is provided with a magnetic step (131) that cooperates with the damping plate (4). The inner side of the damping plate (4) is fixedly connected to the magnetic step (131). The outer side of the damping plate (4) is fixed between the bracket (3) and the damping pressure ring (221). The extension length of the edge (223) of the passive acoustic diaphragm (222) does not exceed the thickness of the damping pressure ring (221).

3. The ultra-thin vibration-damping loudspeaker according to claim 2, characterized in that: An FPC board (5) is also provided on the top of the voice coil (212). The voice coil (212) is connected to an external circuit through the FPC board (5) to ensure lossless transmission of audio signals.

4. The ultra-thin vibration-damping loudspeaker according to claim 3, characterized in that, The top of the central magnet (12) is also fixed with a washer (6), and the FPC board (5) and the washer (6) have matching assembly notches.

5. The ultra-thin vibration-damping loudspeaker according to claim 4, characterized in that, The active diaphragm (211) and the passive diaphragm (222) are provided with a diaphragm center patch (224) in the middle. The diaphragm center patch (224) is also provided with protrusions (2241) arranged in a matrix. The diaphragm center patch (224) is made of aluminum-magnesium alloy.

6. The ultra-thin vibration-damping loudspeaker according to claim 5, characterized in that, The active acoustic diaphragm (211) and the passive acoustic diaphragm (222) are also provided with folding rings (225) along the edge of the support (3).

7. The ultra-thin vibration-damping loudspeaker according to claim 6, characterized in that, The sound-generating component (2) also includes an outer cup (1b) that cooperates with the speaker body (1a). The outer cup (1b) is annular, and the inner side of the outer cup (1b) is fixedly connected to the side wall of the speaker body (1a). An outer sound cavity (1b1) is provided between the outer cup (1b) and the speaker body (1a). Several connecting grooves (2212) are provided on the four sides of the shock-absorbing pressure ring (221) to connect the outer sound cavity (1b1) and the inner sound cavity (1a1) of the speaker body (1a).

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