Sound production unit

Abstract

The invention discloses a sound production unit, which comprises a basin stand, a magnetic circuit assembly, an inner voice coil, an outer voice coil, a diaphragm assembly and a centering disk, and is characterized in that the magnetic circuit assembly comprises a yoke, and a central magnetic structure, a middle magnetic structure and an edge magnetic structure which are respectively arranged on the yoke, and the yoke is provided with a boss; a magnetic conductive cover is arranged on the central magnetic structure, the magnetic conductive cover comprises a body and a surrounding wall, an inner side magnetic gap is formed between the surrounding wall and the central magnetic structure, and a passing opening is formed in the surrounding wall; the magnetic conductive cover is located between the two oppositely-arranged middle magnetic structures. The edge magnetic structures are located on the outer sides of the middle magnetic structures, and outer side magnetic gaps are formed between the edge magnetic structures and the middle magnetic structures. The inner voice coil is arranged in the inner side magnetic gap in a liftable manner; the outer voice coil is arranged in the outer side magnetic gap in a liftable manner, and the boss is located between the inner voice coil and the outer voice coil; the vibrating diaphragm assembly is connected with the basin frame, the magnetic conductive cover and the outer voice coil; the centering disk is located between the inner voice coil and the outer voice coil, is connected with the outer voice coil and the boss, and is connected with the inner voice coil through the passing port. The sounding unit is light and thin in structure and good in performance.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic transducers, and in particular to a sound generating unit. Background Art

[0002] As a common electroacoustic transducer device that converts electrical energy into sound energy, the sound unit plays an indispensable role in the sound amplification system.

[0003] With the rapid development of consumer electronic products such as mobile phones and tablet computers, consumer electronic products have put forward higher requirements on the sound units they carry in terms of performance and size. The dual voice coil structure is a way to improve the performance of the sound unit, but the sound unit of the traditional dual voice coil structure is thick and cannot adapt well to the development trend of thin and light consumer electronic products. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a light and thin high-performance sound-emitting unit.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a sound generating unit, comprising: basin stand; A magnetic circuit assembly, the magnetic circuit assembly is connected to the basin frame, the magnetic circuit assembly includes a yoke and a central magnetic structure, an intermediate magnetic structure and a side magnetic structure respectively arranged on the yoke, the yoke is provided with a boss; the central magnetic structure is provided with a magnetic shield, the magnetic shield includes a body and a surrounding wall arranged along the edge of the body, an inner magnetic gap is formed between the surrounding wall and the central magnetic structure, and a port connecting the inner and outer sides thereof is provided on the surrounding wall; the magnetic shield is located between at least this group of two relatively arranged intermediate magnetic structures, the side magnetic structure is located on the outer side of the intermediate magnetic structure and forms an outer magnetic gap between the intermediate magnetic structure; An inner voice coil, the inner voice coil being liftable and disposed in the inner magnetic gap; An outer voice coil, the outer voice coil can be raised and lowered in the outer magnetic gap, and the boss is located between the inner voice coil and the outer voice coil; A diaphragm assembly, wherein the diaphragm assembly is connected to the basin frame, the magnetic cover and the outer voice coil; A centering support plate is located between the inner voice coil and the outer voice coil, the centering support plate is connected to the outer voice coil and the boss, and is connected to the inner voice coil via the port.

[0006] The beneficial effects of the present invention are as follows: the sound unit has a simple structure, and the dual voice coil structure allows the sound unit to have a stronger driving force, so that the sound unit has a better performance; the design of the magnetic cover can improve the utilization rate of the magnetic force, so that the thickness of the central magnetic structure can be designed to be smaller, and the vibration space of the inner voice coil is large, so that the inner voice coil can achieve a larger amplitude within a limited height space, so that the sound unit can achieve a large amplitude and ultra-thinness; the centering support plate is arranged between the inner voice coil and the outer voice coil, so that the internal space of the sound unit can be fully utilized, and the total volume of the side magnetic structure can be set larger, thereby improving the performance of the sound unit; and the addition of the intermediate magnetic structure further improves the performance of the sound unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A cross-sectional view of the sound unit Figure 1 ; Figure 2 A cross-sectional view of the sound unit Figure 2 ; Figure 3 is a schematic diagram of the internal structure of the sound unit; Figure 4 A cross-sectional view of the sound unit Figure 3 .

[0008] Description of labels: 1. Basin stand; 2. Magnetic circuit assembly; 21. Yoke; 211. Boss; 212. Metal conductive part; 22. Center magnetic structure; 221. Lower center magnetic steel; 222. Center washer; 223. Upper center magnetic steel; 23. Intermediate magnetic structure; 231. Intermediate magnetic steel; 232. Intermediate washer; 24. Side magnetic structure; 241. Side magnetic steel; 242. Side washer; 25. Magnetic cover; 251. Body; 252. Wall; 253. Port; 3. Inner voice coil; 4. External voice coil; 5. Diaphragm assembly; 6. Centering support piece; 61. Mounting part; 62. Cantilever part; 63. Fixing part; 7. Skeleton; 71. Frame-like portion; 72. Supporting legs. DETAILED DESCRIPTION

[0009] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0010] Please refer to Figures 1 to 4 , sound unit, including: Basin stand 1; A magnetic circuit component 2, wherein the magnetic circuit component 2 is connected to the basin frame 1, and the magnetic circuit component 2 comprises a yoke 21 and a central magnetic structure 22, an intermediate magnetic structure 23 and a side magnetic structure 24 respectively arranged on the yoke 21, wherein the yoke 21 is provided with a boss 211; a magnetic shield 25 is provided on the central magnetic structure 22, wherein the magnetic shield 25 comprises a body 251 and a surrounding wall 252 arranged along the edge of the body 251, wherein an inner magnetic gap is formed between the surrounding wall 252 and the central magnetic structure 22, and a port 253 is provided on the surrounding wall 252 for connecting the inner and outer sides thereof; the magnetic shield 25 is located between at least one group of two relatively arranged intermediate magnetic structures 23, and the side magnetic structure 24 is located on the outer side of the intermediate magnetic structure 23 and forms an outer magnetic gap with the intermediate magnetic structure 23; An inner voice coil 3, wherein the inner voice coil 3 can be raised and lowered and is disposed in the inner magnetic gap; An outer voice coil 4, the outer voice coil 4 can be raised and lowered in the outer magnetic gap, and the boss 211 is located between the inner voice coil 3 and the outer voice coil 4; A diaphragm assembly 5, wherein the diaphragm assembly 5 is connected to the basin frame 1, the magnetic cover 25 and the outer voice coil 4; The centering support plate 6 is located between the inner voice coil 3 and the outer voice coil 4 . The centering support plate 6 connects the outer voice coil 4 and the boss 211 , and is connected to the inner voice coil 3 via the port 253 .

[0011] From the above description, it can be seen that the beneficial effects of the present invention are: the sound unit has a simple structure, and the dual voice coil structure allows the sound unit to have a stronger driving force, so that the sound unit has a better performance; the design of the magnetic cover 25 can improve the utilization rate of the magnetic force, so that the thickness of the central magnetic structure 22 can be designed to be smaller, and the vibration space of the inner voice coil 3 is large, so that the inner voice coil 3 can achieve a larger amplitude within a limited height space, so that the sound unit can achieve a large amplitude and ultra-thinness; the centering support plate 6 is arranged between the inner voice coil 3 and the outer voice coil 4, so that the internal space of the sound unit can be fully utilized, and the total volume of the side magnetic structure 24 can be set larger, thereby improving the performance of the sound unit; and the addition of the intermediate magnetic structure 23 further improves the performance of the sound unit.

[0012] Furthermore, the intermediate magnetic structure 23 is located on the outside of the long side of the inner voice coil 3, and the centering support plate 6 is located on the outside of the short axis side of the inner voice coil 3; or, the intermediate magnetic structure 23 is located on the outside of the short side of the inner voice coil 3, and the centering support plate 6 is located on the outside of the long axis side of the inner voice coil 3; or, the outside of the long side and the outside of the short side of the inner voice coil 3 are respectively provided with the intermediate magnetic structure 23, and the centering support plate 6 is located on the outside of the corner of the inner voice coil 3.

[0013] It can be seen from the above description that the position of the centering support piece 6 can be set as needed, which is conducive to enriching the diversity of the sound-emitting unit.

[0014] Furthermore, there are multiple bosses 211 , and a single centering support piece 6 is connected to multiple bosses 211 that are spaced apart.

[0015] It can be seen from the above description that the connection of the centering support piece 6 with a plurality of bosses 211 can make the installation of the centering support piece 6 more stable.

[0016] Furthermore, the centering support plate 6 includes a mounting portion 61, a cantilever portion 62 and a fixing portion 63 which are connected in sequence, the mounting portion 61 connects the inner voice coil 3 and the outer voice coil 4, the fixing portion 63 is fixed on the boss 211, and the centering support plate 6 is conductively connected to the inner voice coil 3 and the outer voice coil 4.

[0017] It can be seen from the above description that both the inner voice coil 3 and the outer voice coil 4 are connected to the external power supply through the centering support plate 6, the voice coil suspension design is cancelled, and the risk of voice coil breakage is avoided.

[0018] Furthermore, the boss 211 is a plastic part, and a metal conductive part 212 is embedded in the boss 211 . The metal conductive part 212 is electrically connected to the centering support piece 6 , and the bottom end of the metal conductive part 212 is exposed on the bottom surface of the yoke 21 .

[0019] Furthermore, a through hole is provided on the boss 211, and the centering support plate 6 also includes a lead-out portion and an exposed portion, one end of the lead-out portion is connected to the fixed portion 63, and the other end of the lead-out portion passes through the through hole to connect to the exposed portion, the exposed portion is exposed to the bottom surface of the yoke 21, and an exposed solder pad is provided on the exposed portion.

[0020] It can be seen from the above description that there are a variety of options for the specific conduction structure between the sound unit and the external power supply, which enriches the diversity of the sound unit.

[0021] Furthermore, the bottom end of the surrounding wall 252 is fixedly connected to the yoke 21 .

[0022] It can be seen from the above description that the fixed connection between the surrounding wall 252 and the yoke 21 is beneficial to improving the structural stability of the sound unit.

[0023] Furthermore, the central magnetic structure 22 includes a lower central magnetic steel 221, a central washer 222 and an upper central magnetic steel 223 which are stacked and connected in sequence from bottom to top, the top surface of the upper central magnetic steel 223 is connected to the main body 251, and the bottom surface of the lower central magnetic steel 221 is connected to the yoke 21.

[0024] It can be seen from the above description that the upper center magnetic steel 223 and the lower center magnetic steel 221 have opposite magnetic poles, so that the central magnetic structure 22 has a stronger magnetic field, which is beneficial to improve the performance of the sound unit to a greater extent.

[0025] Furthermore, it also includes a skeleton 7, which includes a frame-like portion 71 and support feet 72 connected to the frame-like portion 71, the frame-like portion 71 respectively connects the diaphragm assembly 5 and the outer voice coil 4, the support feet 72 are located on the inner side of the outer voice coil 4, and the support feet 72 are connected to the centering support plate 6.

[0026] From the above description, it can be seen that the outer voice coil 4 is indirectly connected to the centering support plate 6 through the support foot 72, and the frame-shaped portion 71 of the skeleton 7 can allow the bottom end of the outer voice coil 4 to penetrate deeper into the outer magnetic gap, thereby improving the sensitivity of the sound unit.

[0027] Furthermore, the diaphragm assembly 5 is in the shape of a ring frame as a whole, and the inner edge of the diaphragm assembly 5 is connected to the outer wall surface of the surrounding wall 252 .

[0028] From the above description, it can be seen that the diaphragm assembly 5 is connected to the surrounding wall 252 of the magnetic cover 25 instead of the top surface, which is beneficial to the control of the cross-sectional height of the sound unit, so that the sound unit can remain light and thin.

[0029] Please refer to Figures 1 to 4 , Embodiment 1 of the present invention is: a sound unit, including a basin frame 1, a magnetic circuit assembly 2, an inner voice coil 3, an outer voice coil 4, a diaphragm assembly 5 and a centering support plate 6, wherein the magnetic circuit assembly 2 is connected to the basin frame 1, and the magnetic circuit assembly 2 includes a yoke 21 and a central magnetic structure 22, an intermediate magnetic structure 23 and a side magnetic structure 24 respectively arranged on the yoke 21, wherein the side magnetic structure 24 is connected to the basin frame 1, and a boss 211 is arranged on the yoke 21; a magnetic cover 25 is arranged on the central magnetic structure 22, and the magnetic cover 25 includes a body 251 and a surrounding wall 252 arranged along the edge of the body 251, an inner magnetic gap is formed between the surrounding wall 252 and the central magnetic structure 22, and a magnetic gap is formed on the surrounding wall 252 to connect the surrounding wall 252. The inner and outer passages 253; the magnetic shield 25 is located between at least this group of two relatively arranged intermediate magnetic structures 23, and the side magnetic structure 24 is located on the outer side of the intermediate magnetic structure 23 and forms an outer magnetic gap with the intermediate magnetic structure 23; the inner voice coil 3 can be raised and lowered in the inner magnetic gap; the outer voice coil 4 can be raised and lowered in the outer magnetic gap, and the boss 211 is located between the inner voice coil 3 and the outer voice coil 4; the diaphragm assembly 5 is connected to the basin frame 1, the magnetic shield 25 and the outer voice coil 4; the centering support plate 6 is located between the inner voice coil 3 and the outer voice coil 4, and the centering support plate 6 connects the outer voice coil 4 and the boss 211, and is connected to the inner voice coil 3 via the passage 253.

[0030] The intermediate magnetic structure 23 is located outside the short side of the inner voice coil 3, and the centering support plate 6 is located outside the long axis of the inner voice coil 3; or, the intermediate magnetic structure 23 is respectively provided outside the long side and the short side of the inner voice coil 3, and the centering support plate 6 is located outside the corner of the inner voice coil 3. In this embodiment, the intermediate magnetic structure 23 is located outside the long side of the inner voice coil 3, and the centering support plate 6 is located outside the short axis of the inner voice coil 3.

[0031] The centering support plate 6 includes a mounting portion 61, a cantilever portion 62 and a fixing portion 63 which are connected in sequence. The mounting portion 61 connects the inner voice coil 3 and the outer voice coil 4. The fixing portion 63 is fixed on the boss 211. The centering support plate 6 is in conduction with the inner voice coil 3 and the outer voice coil 4.

[0032] In other embodiments, a single centering support piece 6 may have only one fixing portion 63, in which case a single centering support piece 6 may be connected to only one boss 211, while in other embodiments, the number of bosses 211 may be multiple, in which case a single centering support piece 6 may be connected to multiple spaced bosses 211. In this embodiment, both ends of the mounting portion 61 in the centering support piece 6 are respectively connected to the cantilever portions 62, and the ends of the two cantilever portions 62 that are away from each other are respectively connected to the fixing portions 63, so the centering support piece 6 in this embodiment is connected to two bosses 211 at the same time, which can effectively improve the stability of the installation of the centering support piece 6.

[0033] In this embodiment, the boss 211 is a plastic part, and a metal conductive part 212 is embedded in the boss 211. The metal conductive part 212 is electrically connected to the centering support piece 6, and the bottom end of the metal conductive part 212 is exposed on the bottom surface of the yoke 21 for conducting with an external power supply. In other embodiments, a through hole is provided on the boss 211, and the centering support piece 6 also includes a lead-out portion and an exposed portion, one end of the lead-out section is connected to the fixing portion 63, and the other end of the lead-out section passes through the through hole to connect to the exposed portion, and the exposed portion is exposed on the bottom surface of the yoke 21, and an exposed pad is provided on the exposed portion.

[0034] As a preferred embodiment, the bottom end of the surrounding wall 252 is fixedly connected to the yoke 21 , and specific connection methods include but are not limited to adhesive connection, welding, etc.

[0035] The intermediate magnetic structure 23 includes an intermediate magnetic steel 231 and an intermediate washer 232, and the intermediate magnetic steel 231 connects the yoke 21 and the intermediate washer 232; the side magnetic structure 24 includes a side magnetic steel 241 and a side washer 242, and the side magnetic steel 241 connects the side washer 242 and the yoke 21; the central magnetic structure 22 includes a lower central magnetic steel 221, a central washer 222 and an upper central magnetic steel 223 stacked and connected in sequence from bottom to top, the top surface of the upper central magnetic steel 223 is connected to the main body 251, and the bottom surface of the lower central magnetic steel 221 is connected to the yoke 21, and the upper central magnetic steel 223 and the lower central magnetic steel 221 have opposite magnetic poles.

[0036] The sound unit also includes a skeleton 7, which includes a frame-like portion 71 and a supporting foot 72 connected to the frame-like portion 71, the frame-like portion 71 respectively connects the diaphragm assembly 5 and the outer voice coil 4, the supporting foot 72 is located on the inner side of the outer voice coil 4, and the supporting foot 72 is connected to the centering support plate 6. In detail, the supporting foot 72 is L-shaped, and the outer voice coil 4 is indirectly connected to the mounting portion 61 of the centering support plate 6 through the supporting foot 72.

[0037] The diaphragm assembly 5 is in the shape of a ring frame as a whole, and the inner edge of the diaphragm assembly 5 is connected to the outer wall surface of the surrounding wall 252 .

[0038] In summary, the sound unit provided by the present invention has a simple structure, and the dual voice coil architecture allows the sound unit to have a stronger driving force, so that the sound unit has a better performance; the design of the magnetic cover can improve the utilization rate of the magnetic force, so that the thickness of the central magnetic structure can be designed to be smaller, and the vibration space of the inner voice coil is large, so that the inner voice coil can achieve a larger amplitude within a limited height space, so that the sound unit can achieve a large amplitude and ultra-thinness; the centering support plate is arranged between the inner voice coil and the outer voice coil, so that the internal space of the sound unit can be fully utilized, and the total volume of the side magnetic structure can be set larger, thereby improving the performance of the sound unit; and the addition of the intermediate magnetic structure further improves the performance of the sound unit.

[0039] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A sound generating unit, characterized in that: include basin stand; A magnetic circuit assembly, the magnetic circuit assembly is connected to the basin frame, the magnetic circuit assembly includes a yoke and a central magnetic structure, an intermediate magnetic structure and a side magnetic structure respectively arranged on the yoke, the yoke is provided with a boss; the central magnetic structure is provided with a magnetic shield, the magnetic shield includes a body and a surrounding wall arranged along the edge of the body, an inner magnetic gap is formed between the surrounding wall and the central magnetic structure, and a port connecting the inner and outer sides thereof is provided on the surrounding wall; the magnetic shield is located between at least this group of two relatively arranged intermediate magnetic structures, the side magnetic structure is located on the outer side of the intermediate magnetic structure and forms an outer magnetic gap between the intermediate magnetic structure; An inner voice coil, the inner voice coil being liftable and disposed in the inner magnetic gap; An outer voice coil, the outer voice coil can be raised and lowered in the outer magnetic gap, and the boss is located between the inner voice coil and the outer voice coil; A diaphragm assembly, wherein the diaphragm assembly is connected to the basin frame, the magnetic cover and the outer voice coil; A centering support plate is located between the inner voice coil and the outer voice coil, the centering support plate is connected to the outer voice coil and the boss, and is connected to the inner voice coil via the port.

2. The sound generating unit according to claim 1, characterized in that: The intermediate magnetic structure is located on the outside of the long side of the inner voice coil, and the centering support is located on the outside of the short axis of the inner voice coil; or, the intermediate magnetic structure is located on the outside of the short side of the inner voice coil, and the centering support is located on the outside of the long axis of the inner voice coil; or, the intermediate magnetic structure is respectively provided on the outside of the long side and the outside of the short side of the inner voice coil, and the centering support is located on the outside of the corner of the inner voice coil.

3. The sound generating unit according to claim 1, characterized in that: There are multiple bosses, and a single centering support plate is connected to multiple bosses that are spaced apart.

4. The sound generating unit according to claim 1, characterized in that: The centering support plate includes a mounting portion, a cantilever portion and a fixing portion which are connected in sequence, the mounting portion connects the inner voice coil and the outer voice coil, the fixing portion is fixed on the boss, and the centering support plate is in conduction with the inner voice coil and the outer voice coil.

5. The sound generating unit according to claim 4, characterized in that: The boss is a plastic part, a metal conductive part is embedded in the boss, the metal conductive part is electrically connected to the centering support plate, and the bottom end of the metal conductive part is exposed on the bottom surface of the yoke.

6. The sound generating unit according to claim 4, characterized in that: The boss is provided with a through hole, and the centering support plate also includes a lead-out portion and an exposed portion, one end of the lead-out portion is connected to the fixed portion, and the other end of the lead-out portion passes through the through hole to connect to the exposed portion, the exposed portion is exposed on the bottom surface of the yoke, and an exposed welding pad is provided on the exposed portion.

7. The sound generating unit according to claim 1, characterized in that: The bottom end of the surrounding wall is fixedly connected to the yoke.

8. The sound generating unit according to claim 1, characterized in that: The central magnetic structure includes a lower central magnetic steel, a central washer and an upper central magnetic steel which are stacked and connected in sequence from bottom to top. The top surface of the upper central magnetic steel is connected to the body, and the bottom surface of the lower central magnetic steel is connected to the yoke.

9. The sound generating unit according to claim 1, characterized in that: It also includes a skeleton, which includes a frame-shaped part and supporting feet connected to the frame-shaped part, the frame-shaped part respectively connects the diaphragm assembly and the outer voice coil, the supporting feet are located on the inner side of the outer voice coil, and the supporting feet are connected to the centering support plate.

10. The sound generating unit according to claim 1, characterized in that: The diaphragm assembly is in the shape of a ring frame as a whole, and the inner edge of the diaphragm assembly is connected to the outer wall surface of the surrounding wall.

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