Miniature speaker

Abstract

This utility model discloses a miniature loudspeaker, including a housing, a ring voice coil, a magnetic circuit assembly, and two sets of vibrating assemblies. The two sets of vibrating assemblies are arranged opposite to each other. Each vibrating assembly includes a connected diaphragm assembly and a frame. The diaphragm assembly is connected to the top and bottom of the housing, respectively. The frame is connected to the ring voice coil. The magnetic circuit assembly is connected to the housing and located between the two sets of diaphragm assemblies. The magnetic circuit assembly has a magnetic gap for the ring voice coil to move. The magnetic circuit assembly includes a lower yoke, a central magnetic structure, and an upper yoke connected sequentially from bottom to top. The magnetic gap is arranged around the central magnetic structure and located between the upper and lower yokes. The magnetic circuit assembly has an upper magnetic loop and a lower magnetic loop with opposite directions. The upper magnetic loop passes through the upper part of the magnetic gap, and the lower magnetic loop passes through the lower part of the magnetic gap. This miniature loudspeaker has the advantages of small size and high performance.

Description

Technical Field

[0001] This utility model relates to the field of electroacoustic converter technology, and in particular to miniature loudspeakers. Background Technology

[0002] In today's pursuit of ultimate compactness in wearable devices, miniature speakers are caught between two uncompromising red lines: as the casing thickness continues to shrink, acoustic components can only be hidden in narrow, edge spaces; at the same time, users expect them to produce full, clear, and transparent sound, handling calls, music, and instant notifications with ease. Once the traditional dynamic driver structure shrinks, the diaphragm area and vibration stroke decrease simultaneously, resulting in a sharp drop in sound pressure level and low-frequency performance, and a rapid increase in distortion. The contradiction between size and performance becomes increasingly acute, making miniature speakers the most difficult barrier to overcome in upgrading the user experience of terminal devices, especially for smartwatches. Conventional rectangular miniature speakers require a large amount of space, further complicating the internal space of smartwatches. Summary of the Invention

[0003] The technical problem solved by this invention is to provide a small-sized, high-performance miniature loudspeaker.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a miniature loudspeaker, comprising a housing, a ring voice coil, a magnetic circuit assembly, and two sets of vibration assemblies, the two sets of vibration assemblies being arranged opposite to each other, each vibration assembly including a connected diaphragm assembly and a frame; the top and bottom of the housing are respectively connected to the diaphragm assembly; the frame is connected to the ring voice coil; the magnetic circuit assembly is connected to the housing and located between the two sets of diaphragm assemblies, the magnetic circuit assembly having a magnetic gap for the ring voice coil to move, the magnetic circuit assembly including a lower yoke, a central magnetic structure, and an upper yoke connected sequentially from bottom to top, the magnetic gap being arranged around the central magnetic structure and located between the upper yoke and the lower yoke, the magnetic circuit assembly having an upper magnetic loop and a lower magnetic loop in opposite directions, the upper magnetic loop passing through the upper part of the magnetic gap, and the lower magnetic loop passing through the lower part of the magnetic gap.

[0005] In one embodiment, the central magnetic structure includes a lower central magnet, a central washer, and an upper central magnet connected sequentially from bottom to top. The lower central magnet is connected to the lower yoke, and the upper central magnet is connected to the upper yoke. The magnetic poles of the lower central magnet and the upper central magnet face opposite directions.

[0006] In one embodiment, at least one of the upper yoke and the lower yoke has a bent flange structure on its side, and the flange structure forms a magnetic gap with the central magnetic structure. The flange structure is respectively located on opposite sides of the central magnetic structure.

[0007] In one embodiment, the sidewall of the housing has a window through which the flange structure is exposed.

[0008] In one embodiment, the flange structure includes an upper flange and a lower flange. The upper yoke has an upper flange that bends downward on its opposite sides, and the lower yoke has a lower flange that bends upward on its opposite sides. The upper flange forms the upper part of the magnetic gap with the central magnetic structure, and the lower flange forms the lower part of the magnetic gap with the central magnetic structure.

[0009] In one embodiment, a centering support is further included. The centering support includes an inner mounting portion, a deformation portion, an outer mounting portion, and an extension portion connected in sequence. At least one of the annular voice coil and the frame is fixedly connected to the inner mounting portion. The inner mounting portion is provided with an inner solder pad for welding and communicating with the annular voice coil. The extension portion extends to the outside of the housing through the gap between the upper flange and the lower flange. The extension portion is provided with an outer solder pad electrically connected to the inner solder pad. At least one of the upper yoke and the lower yoke has an L-shaped mounting arm, and the outer mounting portion is fixed to the mounting arm.

[0010] In one embodiment, the top and bottom surfaces of the inner mounting portion are respectively connected to the skeleton.

[0011] In one embodiment, the upper yoke and the lower yoke each have a protrusion that protrudes from the end of the central magnetic structure; the protrusion has an opening through which the skeleton passes.

[0012] In one embodiment, the diaphragm assembly includes a diaphragm and a dome disposed on the diaphragm, the frame is connected to the dome, and the dome is provided with a plurality of downwardly protruding reinforcing ribs, at least some of the reinforcing ribs being disposed corresponding to the through-hole.

[0013] In one embodiment, at least two adjacent reinforcing ribs form an adhesive joint, and a portion of the skeleton is bonded and fixed to the dome at the adhesive joint.

[0014] The beneficial effects of this invention are as follows: the annular voice coil is coupled with the upper and lower double-layer reverse magnetic circuits, forming superimposed magnetic flux within the same magnetic gap, greatly increasing the driving force density, allowing the diaphragm assembly to maintain sufficient stroke, and suppressing distortion to a low level; the dual-sided vibration produces sound, and the two sets of diaphragm assemblies can radiate sound waves with opposite phases outward, utilizing the dipole effect to achieve far-field cancellation of sound, while people nearby can still hear the sound clearly, which helps to improve the privacy of calls; this miniature speaker, when installed on terminal devices such as watches, allows the entire device to remain slim and rounded, yet can output full, transparent, and sufficiently loud near-field sound effects, balancing small size and high performance, breaking through the bottleneck of acoustic experience upgrades in wearable devices. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 Cross-section of the miniature loudspeaker of Embodiment 1 Figure 1 ;

[0017] Figure 2 Cross-section of the miniature loudspeaker of Embodiment 1 Figure 2 ;

[0018] Figure 3 This is a schematic diagram of the magnetic circuit assembly in the miniature loudspeaker of Embodiment 1;

[0019] Figure 4 This is a schematic diagram of a portion of the structure of the miniature loudspeaker in Embodiment 1.

[0020] Explanation of icon numbers:

[0021] 1. Shell; 11. Window;

[0022] 2. Circular voice coil;

[0023] 3. Magnetic circuit assembly; 31. Magnetic gap; 32. Lower yoke; 321. Lower flange; 33. Central magnetic structure; 331. Lower central magnet; 332. Central washer; 333. Upper central magnet; 34. Upper yoke; 341. Upper flange; 35. Mounting arm; 36. Protrusion; 361. Through-hole;

[0024] 4. Vibration assembly; 41. Diaphragm assembly; 411. Diaphragm; 412. Dome; 4121. Reinforcing rib; 4122. Bonding point; 42. Frame;

[0025] 5. Centering support; 51. Inner mounting part; 511. Inner solder pad; 52. Deformation part; 53. Outer mounting part; 54. Outer extension part; 541. Outer solder pad. Detailed Implementation

[0026] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] It should be noted that if the embodiments of this utility model involve directional indicators such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicators will also change accordingly.

[0029] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0030] Furthermore, if the meaning of "and / or" in the entire text is to include three parallel solutions, taking "and A / or B" as an example, it includes solution A, solution B, and a solution that simultaneously satisfies both A and B. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] Example 1

[0033] Please refer to Figures 1 to 4One embodiment of this utility model is a miniature loudspeaker, comprising a housing 1, a ring voice coil 2, a magnetic circuit assembly 3, and two sets of vibration assemblies 4. The two sets of vibration assemblies 4 are arranged opposite to each other. Each vibration assembly 4 includes a diaphragm assembly 41 and a frame 42 connected together. The top and bottom of the housing 1 are respectively connected to the diaphragm assembly 41. The frame 42 is connected to the ring voice coil 2. The magnetic circuit assembly 3 is connected to the housing 1 and located between the two sets of diaphragm assemblies 41. The magnetic circuit assembly 3 has a magnetic gap 31 for the ring voice coil 2 to move. The magnetic circuit assembly 3 includes a lower yoke 32, a central magnetic structure 33, and an upper yoke 34 connected sequentially from bottom to top. The magnetic gap 31 is arranged around the central magnetic structure 33 and located between the upper yoke 34 and the lower yoke 32. The magnetic circuit assembly 3 has an upper magnetic circuit and a lower magnetic circuit with opposite directions. The upper magnetic circuit passes through the upper part of the magnetic gap 31, and the lower magnetic circuit passes through the lower part of the magnetic gap 31.

[0034] The central magnetic structure 33 includes a lower central magnet 331, a central washer 332, and an upper central magnet 333 connected sequentially from bottom to top. The lower central magnet 331 is connected to the lower yoke 32, and the upper central magnet 333 is connected to the upper yoke 34. The magnetic poles of the lower central magnet 331 and the upper central magnet 333 face opposite directions. The magnetic poles in the central magnetic structure 33 naturally form an upright structure, allowing the upper and lower magnetic circuits to obtain high magnetic flux densities with opposite directions and similar values ​​within the magnetic gap 31.

[0035] At least one of the upper yoke 34 and the lower yoke 32 has a bent flange structure on its side. The flange structure forms a magnetic gap 31 with the central magnetic structure 33. The flange structure is located on the opposite sides of the central magnetic structure 33. The flange structure can play a magnetic guiding role.

[0036] The side wall of the housing 1 has a window 11, through which the flanged structure is exposed. The window 11 on the side wall of the housing 1 exposes the flanged structure, which directly acts as a heat sink. The heat generated by the magnet and the rectangular voice coil can be quickly dissipated through the flanged structure, reducing the temperature rise of the rectangular voice coil and preventing thermal protection and volume reduction when devices such as smartwatches play music for extended periods. At the same time, the presence of the window 11 can further reduce the overall width of the miniature speaker, allowing the miniature speaker to be made even smaller.

[0037] In this embodiment, the flange structure includes an upper flange 341 and a lower flange 321. The upper yoke 34 has an upper flange 341 that bends downward on its opposite sides, and the lower yoke 32 has a lower flange 321 that bends upward on its opposite sides. The upper flange 341 and the central magnetic structure 33 form the upper part of the magnetic gap 31, and the lower flange 321 and the central magnetic structure 33 form the lower part of the magnetic gap 31.

[0038] The miniature loudspeaker also includes a centering support 5, which includes an inner mounting portion 51, a deformation portion 52, an outer mounting portion 53, and an extension portion 54 connected in sequence. At least one of the annular voice coil 2 and the frame 42 is fixedly connected to the inner mounting portion 51. The inner mounting portion 51 is provided with an inner solder pad 511 for welding and communicating with the annular voice coil 2. The extension portion 54 extends to the outside of the housing 1 through the gap between the upper flange 341 and the lower flange 321. The extension portion 54 is provided with an outer solder pad 541 electrically connected to the inner solder pad 511. At least one of the upper yoke 34 and the lower yoke 32 has an L-shaped mounting arm 35, and the outer mounting portion 53 is fixed to the mounting arm 35.

[0039] The top and bottom surfaces of the inner mounting part 51 are respectively connected to the skeleton 42. The top and bottom surfaces of the inner mounting part 51 are fixed to the skeleton 42, so that the two sets of diaphragm assemblies 41 are synchronously axially constrained by the same centering support 5. The phase difference of the diaphragm motion is locked in a very small range, and the far-field cancellation effect of the dipole is more stable.

[0040] The upper yoke 34 and the lower yoke 32 each have a protrusion 36 that protrudes from the end of the central magnetic structure 33. The protrusion 36 can extend the magnetic circuit outward and form an additional magnetic "brim" on the outer side of the end of the central magnetic structure 33, which effectively reduces end magnetic leakage and reduces interference to nearby external devices. The protrusion 36 also serves as a step for positioning with the housing 1. During assembly, it directly abuts against the side wall, eliminating the need for additional positioning posts, simplifying the mold, and allowing the elongated miniature speaker to be precisely fixed in the length direction, avoiding abnormal noise caused by lateral shaking.

[0041] The protrusion 36 has an opening 361 through which the skeleton 42 passes. The opening 361 can avoid the skeleton 42 and allow the top of the skeleton 42 to pass directly through the upper yoke 34 / lower yoke 32 to connect with the diaphragm assembly 41, thereby shortening the height of the vibration chain.

[0042] The diaphragm assembly 41 includes a diaphragm 411 and a dome 412 disposed on the diaphragm 411. The frame 42 is connected to the dome 412. The dome 412 is provided with a plurality of downwardly protruding reinforcing ribs 4121, at least some of which are positioned corresponding to the opening 361. The reinforcing ribs 4121 can be stamped protrusions or the like. Multiple reinforcing ribs 4121 are integrally formed with the surface of the dome 412 facing downwards, and some of the ribs are directly opposite the opening 361 area. This can locally increase rigidity without increasing the mass of the dome 412, thus suppressing high-frequency segmented vibration. The fact that some of the reinforcing ribs 4121 are positioned corresponding to the opening 361 allows the opening 361 to not only avoid the frame 42 but also avoid the reinforcing ribs 4121, achieving multiple uses from a single component.

[0043] In one embodiment, at least two adjacent reinforcing ribs 4121 form an adhesive joint 4122, and a portion of the skeleton 42 is bonded and fixed to the dome 412 at the adhesive joint 4122. The adhesive joint 4122 formed between two adjacent reinforcing ribs 4121 can improve the phenomenon of glue overflow to a certain extent, so that the glue used to fix the skeleton 42 and the dome 412 is confined between the two adjacent reinforcing ribs 4121, and the glue solidifies in the area corresponding to the through-hole 361, thereby avoiding the collision between the central magnetic structure 33 and the glue formed after the glue solidifies during the vibration of the diaphragm assembly 41, and ensuring the working stability of the miniature loudspeaker.

[0044] The above are merely optional embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A microspeaker, characterized by, include Two sets of vibration components are arranged opposite to each other, and each vibration component includes a connected diaphragm component and a frame. A housing, wherein the diaphragm assembly is connected to the top and bottom of the housing, respectively; A ring voice coil, the frame being connected to the ring voice coil; A magnetic circuit assembly is connected to the housing and located between the two sets of diaphragm assemblies. The magnetic circuit assembly has a magnetic gap for the movement of the annular voice coil. The magnetic circuit assembly includes a lower yoke, a central magnetic structure, and an upper yoke connected sequentially from bottom to top. The magnetic gap is arranged around the central magnetic structure and located between the upper yoke and the lower yoke. The magnetic circuit assembly has an upper magnetic loop and a lower magnetic loop with opposite directions. The upper magnetic loop passes through the upper part of the magnetic gap, and the lower magnetic loop passes through the lower part of the magnetic gap.

2. The microspeaker of claim 1, wherein, The central magnetic structure includes a lower central magnet, a central washer, and an upper central magnet connected sequentially from bottom to top. The lower central magnet is connected to the lower yoke, and the upper central magnet is connected to the upper yoke. The magnetic poles of the lower central magnet and the upper central magnet face opposite directions.

3. The micro speaker of claim 1, wherein, At least one of the upper yoke and the lower yoke has a bent flange structure on its side, and the flange structure forms a magnetic gap with the central magnetic structure. The flange structure is respectively located on the opposite sides of the central magnetic structure.

4. The microspeaker of claim 3, wherein, The side wall of the housing has a window, through which the flange structure is exposed.

5. The microspeaker of claim 3, wherein, The flange structure includes an upper flange and a lower flange. The upper yoke has an upper flange that bends downward on its opposite sides, and the lower yoke has a lower flange that bends upward on its opposite sides. The upper flange and the central magnetic structure form the upper part of the magnetic gap, and the lower flange and the central magnetic structure form the lower part of the magnetic gap.

6. The microspeaker of claim 5, wherein, It also includes a centering support, which comprises an inner mounting portion, a deformation portion, an outer mounting portion, and an extension portion connected in sequence. At least one of the annular voice coil and the frame is fixedly connected to the inner mounting portion. The inner mounting portion is provided with an inner solder pad for welding and conducting with the annular voice coil. The extension portion extends to the outside of the housing through the gap between the upper flange and the lower flange. The extension portion is provided with an outer solder pad electrically connected to the inner solder pad. At least one of the upper yoke and the lower yoke has an L-shaped mounting arm, and the outer mounting portion is fixed to the mounting arm.

7. The microspeaker of claim 6, wherein, The top and bottom surfaces of the internal mounting portion are respectively connected to the frame.

8. The microspeaker of claim 1, wherein, The upper yoke and lower yoke each have a protrusion that protrudes from the end of the central magnetic structure; the protrusion has an opening through which the skeleton passes.

9. The microspeaker of claim 8, wherein, The diaphragm assembly includes a diaphragm and a dome disposed on the diaphragm. The frame is connected to the dome, and the dome is provided with a plurality of downwardly protruding reinforcing ribs, at least some of which are provided corresponding to the opening.

10. The microspeaker of claim 9, wherein, At least two adjacent reinforcing ribs form an adhesive joint, and a portion of the skeleton is bonded and fixed to the dome at the adhesive joint.

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