Sound production unit

Abstract

The utility model discloses a sound production unit, which comprises a basin stand, a vibration assembly, a magnetic circuit assembly and a supporting part, and is characterized in that the vibration assembly comprises a diaphragm assembly and two voice coils, and the diaphragm assembly is connected with the voice coils and the basin stand; the magnetic circuit assembly comprises a yoke and two groups of center magnetic structures and side magnetic structures which are respectively arranged on the yoke, the two groups of center magnetic structures are arranged side by side and are in one-to-one correspondence with the voice coils, the side magnetic structures are arranged around the center magnetic structures, each side magnetic structure comprises two groups of concave magnetic structures which are oppositely arranged, and a gap is formed between the two groups of concave magnetic structures; the gap is arranged corresponding to a gap between the two voice coils; the supporting component comprises a centering support chip, the centering support chip comprises an outer fixing part, a cantilever part and an inner fixing part which are sequentially connected from outside to inside, the outer fixing part is connected with the basin stand, the inner fixing part is located on the inner side of the edge magnetic structure and connected with the voice coil, and a partial area of the cantilever part is located in the gap. The sound production unit is novel in structure, adopts a double-voice-coil structure, and is large in overall size of an edge magnetic structure and excellent in performance.

Description

Technical Field

[0001] The utility model relates to the technical field of electroacoustic transducers, and particularly to a sounding unit. Background Art

[0002] Sounding units are mostly used in electronic devices such as mobile phones and earphones, and the scenarios where they are used are mostly for calls, playing music, playing videos, etc.

[0003] In order to improve the utilization rate of the magnet and make the sounding unit have strong driving force and greater loudness, a scheme of arranging two voice coils side by side has emerged on the market. In order to improve the sensitivity of the sounding unit with a dual voice coil structure, support components are respectively connected to the four corners of the voice coil assembly. The position of the edge magnetic structure corresponding to the support component needs to be cleared, which results in that the volume of the edge magnetic structure cannot be increased. At the same time, it also causes the length of the effective magnetic gap of the magnetic circuit component not to increase, so that the BL value of the sounding unit is difficult to improve, and the performance of the sounding unit is less than satisfactory. Summary of the Utility Model

[0004] The technical problem solved by the utility model is to provide a high-performance sounding unit with a dual voice coil structure.

[0005] In order to solve the above technical problems, the technical scheme adopted by the utility model is as follows: a sounding unit, comprising:

[0006] A chassis;

[0007] A vibration assembly, the vibration assembly includes a diaphragm assembly and two voice coils, and the diaphragm assembly connects the voice coils and the chassis;

[0008] A magnetic circuit assembly, the magnetic circuit assembly includes a yoke and a central magnetic structure and an edge magnetic structure respectively arranged on the yoke. The central magnetic structure is arranged in two groups side by side. The central magnetic structure corresponds to the voice coil one by one. The edge magnetic structure surrounds the central magnetic structure. The edge magnetic structure includes two groups of concave magnetic structures arranged oppositely. A gap is formed between the two groups of concave magnetic structures, and the gap is arranged corresponding to the gap between the two voice coils;

[0009] A support component, the support component includes a centering washer. The centering washer includes an outer fixing part, a cantilever part and an inner fixing part connected in sequence from outside to inside. The outer fixing part connects the chassis. The inner fixing part is located inside the edge magnetic structure and connects the voice coil. A part of the cantilever part is located in the gap.

[0010] In an embodiment, the magnetic poles of the two groups of central magnetic structures face in opposite directions, and the magnetic poles of the central magnetic structure and the adjacent edge magnetic structure face in opposite directions.

[0011] In one embodiment, the two voice coils are adhesively bonded to each other, or the two voice coils are arranged without contacting each other.

[0012] In one embodiment, an inner pad is provided on the inner fixing part, an outer pad electrically connected to the inner pad is provided on the outer fixing part, the inner pad is located inside the voice coil, and the lead of the voice coil is welded to the inner pad.

[0013] In one embodiment, the central magnetic structure has an avoidance groove for avoiding the inner fixing part.

[0014] In one embodiment, the bottom of the voice coil is fixedly connected to the inner fixing part by a colloid, and the colloid contacts the bottom surface and the inner wall surface of the voice coil.

[0015] In one embodiment, the number of the centering supports is two, two inner pads and two outer pads are provided on the centering supports, the two inner pads on the same centering support are connected to the two outer pads in one-to-one correspondence, and the two inner pads on the same centering support are respectively electrically connected to the two voice coils.

[0016] In one embodiment, the concave magnetic structure includes a side magnet steel in a concave shape. The side magnet steel is an integral structure, or the side magnet steel is formed by arranging and combining a plurality of sub-magnet steels, and there is no gap connecting the inner and outer sides of the sub-magnet steels between two adjacent sub-magnet steels.

[0017] In one embodiment, the two groups of concave magnetic structures are symmetrically arranged.

[0018] In one embodiment, the support member further includes an elastic auxiliary film, and the elastic auxiliary film connects the inner fixing part and the outer fixing part.

[0019] The beneficial effects of the present utility model are as follows: The structure of the present sounding unit is novel, and the four corners of the side magnetic structure do not need to be cleared, so that the volume of the side magnetic structure in the sounding unit can be increased, thereby increasing the B value of the sounding unit. At the same time, the effective length of the magnetic gap can also be increased, that is, the L value of the sounding unit is increased. After the BL value of the sounding unit is increased, the performance of the sounding unit can also be significantly improved.

[0020] All regions of the inner fixing part are located inside the side magnetic structure, so that only the cantilever part passes through the gap between the two groups of concave magnetic structures. By designing the width and position of the cantilever part, the width of the gap can be designed to be smaller, so that the overall volume of the side magnetic structure can be set larger, and further improve the B value of the sounding unit to further improve the acoustic performance of the sounding unit. Moreover, the length of the cantilever part is long enough to reduce its stress, which is beneficial to increasing the fracture margin of the centering support, so that the reliability of the centering support is higher.

[0021] The sound unit adopts a dual voice coil structure, which can effectively enhance the driving force, enabling the sound unit to achieve large amplitude and loudness. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 This is an exploded view of the sound unit of the first embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the sound unit of the first embodiment of the present invention. Figure 1 ;

[0025] Figure 3 This is a schematic diagram of the structure of the sound unit of the first embodiment of the present invention. Figure 2 ;

[0026] Figure 4 This is a cross-sectional view of the sound unit of the first embodiment of the present invention.

[0027] Description of Figure Numbers:

[0028] 1. Basin rack;

[0029] 2. Diaphragm assembly;

[0030] 3. Voice coil; 31. Lead wire;

[0031] 41. Yoke; 42. Center magnetic structure; 421. Center magnet; 422. Center washer; 423. Avoidance groove; 43. Concave magnetic structure; 431. Side magnet; 432. Side washer; 44. Gap;

[0032] 5. Centering support; 51. External fixing portion; 52. Cantilever portion; 53. Internal fixing portion;

[0033] 6. Skeleton. DETAILED DESCRIPTION

[0034] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments.

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0036] It should be noted that if there are directional indications such as up, down, left, right, front, back... in the embodiments of the present utility model, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indications will also change accordingly.

[0037] In addition, if there are descriptions such as "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature.

[0038] In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel solutions. Taking "and / or" as an example, it includes the solution, or the solution, or the solution that satisfies both simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. 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 protection scope required by the present utility model.

[0039] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] Embodiment 1

[0041] Please refer to Figures 1 to 4, Embodiment 1 of the present utility model is as follows: The sound generating unit includes a chassis 1, a vibration assembly, a magnetic circuit assembly, and a support component. The vibration assembly includes a diaphragm assembly 2 and two voice coils 3. The two voice coils 3 are arranged side by side. The diaphragm assembly 2 connects the voice coils 3 and the chassis 1. The magnetic circuit assembly includes a yoke 41, a central magnetic structure 42 and a side magnetic structure respectively arranged on the yoke 41. The number of the central magnetic structures 42 is two groups. The two groups of central magnetic structures 42 are arranged side by side. The central magnetic structures 42 and the voice coils 3 are in one-to-one correspondence. The side magnetic structure surrounds the central magnetic structure 42. The side magnetic structure includes two groups of concave magnetic structures 43 arranged oppositely. A gap 44 is formed between the two groups of concave magnetic structures 43. The gap 44 corresponds to the gap between the two voice coils 3. The support component includes a centering washer 5. The centering washer 5 includes an outer fixing portion 51, a cantilever portion 52 and an inner fixing portion 53 connected in sequence from outside to inside. The outer fixing portion 51 connects the chassis 1. The inner fixing portion 53 is located inside the side magnetic structure and connects the voice coil 3. A part of the cantilever portion 52 is located in the gap 44.

[0042] In some embodiments, the two voice coils 3 are arranged without contacting each other. At this time, there is an obvious gap between the two voice coils 3. In this embodiment, the two voice coils 3 are bonded to each other, so as to improve the structural stability of the vibration assembly and improve the splitting vibration phenomenon of the vibration assembly.

[0043] The two groups of concave magnetic structures 43 are symmetrically arranged. That is to say, the two groups of concave magnetic structures 43 form a symmetric structure. Specifically, the concave magnetic structure 43 includes a side magnet 431 and a side washer 432. The side magnet 431 connects the yoke 41 and the side washer 432. The side magnet 431 and the side washer 432 are respectively in a concave shape. The side magnet 431 in a concave shape can be either an integral overall structure or composed of a plurality of sub-magnets arranged and combined. There is no gap connecting the inner and outer sides of the sub-magnets between adjacent two sub-magnets. In other words, there is no gap at the end corners of the side magnet 431 composed of a plurality of sub-magnets arranged and combined.

[0044] The magnetic poles of the two groups of concave magnetic structures 43 face in opposite directions. That is to say, when the bottom end of one side magnet 431 is an S pole, the bottom end of the other side magnet 431 is an N pole.

[0045] The magnetic poles of the central magnetic structure 42 and the adjacent side magnetic structures are oriented oppositely. The central magnetic structure 42 includes a central magnetic steel 421 and a central washer 422. The central magnetic steel 421 connects the central washer 422 and the yoke 41. The magnetic poles of the central magnetic steel 421 are oriented oppositely to the magnetic poles of the adjacent side magnetic steels 431. That is, when the bottom end of one central magnetic steel 421 is the N pole, the bottom end of the adjacent side magnetic steel 431 is the S pole, and the bottom end of the other central magnetic steel 421 is the S pole.

[0046] Optionally, the sound-producing unit further includes a skeleton 6, which connects the diaphragm assembly 2 and the voice coil 3, respectively. That is, the voice coil 3 is indirectly connected to the diaphragm assembly 2 via the skeleton 6. The diaphragm assembly 2 includes a diaphragm and a dome disposed on the diaphragm. In this embodiment, the skeleton 6 is generally in the shape of a Chinese character "日".

[0047] Preferably, an inner pad is provided on the inner fixing portion 53 , an outer pad electrically connected to the inner pad is provided on the outer fixing portion 51 , the inner pad is located inside the voice coil 3 , and the lead 31 of the voice coil 3 is welded to the inner pad.

[0048] The central magnetic structure 42 has an avoidance groove 423 for avoiding the inner fixing part 53, thereby preventing the inner fixing part 53 from colliding with the central magnetic structure 42 when the sound unit is working. At the same time, the inner fixing part 53 can have enough space to set the inner welding pad.

[0049] Specifically, the bottom of the voice coil 3 is fixedly connected to the inner fixing portion 53 via a colloid, which contacts the bottom and inner wall of the voice coil 3. In a specific product, the colloid may also contact the outer wall of the voice coil 3, thereby further increasing the bonding area between the inner fixing portion 53 and the voice coil 3.

[0050] In detail, there are two centering supports 5, and two inner pads and two outer pads are provided on the centering support 5. The two inner pads on the same centering support 5 are connected to the two outer pads in a one-to-one correspondence, and the two inner pads on the same centering support 5 are electrically connected to the two voice coils 3 respectively.

[0051] In order to enable the support component to provide greater supporting force, the support component optionally further includes an elastic auxiliary membrane, which connects the inner fixing portion 53 and the outer fixing portion 51. The material of the elastic auxiliary membrane and the material of the sound membrane can be the same or different.

[0052] The above are only alternative embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made under the inventive concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. Sound generating unit, characterized in that: including a chassis; a vibration assembly, the vibration assembly including a diaphragm assembly and two voice coils, the diaphragm assembly connecting the voice coils and the chassis; a magnetic circuit assembly, the magnetic circuit assembly including a yoke and a central magnetic structure and a side magnetic structure respectively disposed on the yoke, the central magnetic structure being two sets arranged side by side, the central magnetic structure corresponding to the voice coils one by one, the side magnetic structure surrounding the central magnetic structure, the side magnetic structure including two sets of concave magnetic structures arranged oppositely, a gap being formed between the two sets of concave magnetic structures, the gap being arranged corresponding to the gap between the two voice coils; a support member, the support member including a centering washer, the centering washer including an outer fixing portion, a cantilever portion and an inner fixing portion connected in sequence from outside to inside, the outer fixing portion connecting the chassis, the inner fixing portion being located inside the side magnetic structure and connecting the voice coil, and a partial area of the cantilever portion being located in the gap; 2. The sound generating unit according to claim 1, wherein: The magnetic poles of the two sets of central magnetic structures face in opposite directions, and the magnetic poles of the central magnetic structure and the adjacent side magnetic structure face in opposite directions.

3. The sound generating unit according to claim 1, wherein: The two voice coils are adhesively bonded to each other, or the two voice coils are arranged without contacting each other.

4. The sound generating unit according to claim 1, wherein: An inner pad is provided on the inner fixing portion, an outer pad electrically connected to the inner pad is provided on the outer fixing portion, the inner pad is located inside the voice coil, and the lead of the voice coil is welded to the inner pad.

5. The sound generating unit according to claim 4, wherein: The central magnetic structure has an avoidance groove for avoiding the inner fixing portion.

6. The sound generating unit according to claim 4, characterized in that: The bottom of the voice coil is fixedly connected to the inner fixing portion by a colloid, and the colloid contacts the bottom surface and the inner wall surface of the voice coil.

7. The sound generating unit according to claim 4, wherein: The number of centering washers is two, two inner pads and two outer pads are provided on the centering washers, the two inner pads and the two outer pads on the same centering washer are connected in one-to-one correspondence, and the two inner pads on the same centering washer are electrically connected to the two voice coils respectively.

8. The sound generating unit according to claim 1, wherein: The concave magnetic structure includes a side magnetic steel in a concave shape, the side magnetic steel is an integral structure, or the side magnetic steel is formed by arranging and combining a plurality of sub-magnetic steels, and there is no gap connecting the inner and outer sides of the sub-magnetic steels between two adjacent sub-magnetic steels.

9. The sound generating unit according to claim 1, characterized in that: The two sets of concave magnetic structures are symmetrically arranged.

10. The sound generating unit according to claim 1, characterized in that: The support member further includes an elastic auxiliary film, and the elastic auxiliary film connects the inner fixing portion and the outer fixing portion.

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