Miniature loudspeaker

Abstract

The miniature loudspeaker comprises a frame, a magnetic circuit assembly and a vibration assembly, the magnetic circuit assembly comprises a magnetic cover, a yoke, a center magnetic structure and an edge magnetic structure, the center magnetic structure and the edge magnetic structure are arranged on the yoke, the edge magnetic structure is connected with the frame, and a first magnetic gap is formed between the edge magnetic structure and the center magnetic structure; the central magnetic structure comprises a first central magnetic steel, a first central washer, a second central magnetic steel, a second central washer and a third central magnetic steel which are sequentially stacked and connected from bottom to top, the magnetic cover comprises a top plate and a surrounding wall, and a second magnetic gap is formed between the surrounding wall and the central magnetic structure; the vibration assembly comprises a voice diaphragm, a ball top, a first voice coil and a second voice coil, the voice diaphragm comprises an inner folding ring part, a connecting part, an outer folding ring part and an outer fixing part, the outer fixing part is connected with the basin frame, the inner folding ring part is connected with the enclosure wall, the ball top is connected with the connecting part, the first voice coil is located at the first magnetic gap and connected with the ball top, and the second voice coil is located at the second magnetic gap and connected with the ball top. The miniature loudspeaker is excellent in performance and small in required installation area.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic converters, in particular to a micro loudspeaker. Background Art

[0002] Micro speakers are widely used in portable electronic devices such as mobile phones, laptops, and hearing aids. With the miniaturization of these portable electronic devices, people have higher and higher requirements on the size and performance of the micro electroacoustic devices used in them. In a relatively small size, a larger driving force is required at the same time.

[0003] A micro speaker with a dual voice coil structure can provide a greater driving force, but in an existing micro speaker with a dual voice coil structure, the two voice coils are arranged side by side, which results in the micro speaker with a dual voice coil structure requiring a larger installation area. Summary of the invention

[0004] The technical problem solved by the present invention is to provide a high-performance micro-speaker with a small required installation area.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a micro speaker, comprising:

[0006] basin stand;

[0007] A magnetic circuit component, the magnetic circuit component includes a magnetic cover, a yoke, and a central magnetic structure and a side magnetic structure respectively arranged on the yoke, the side magnetic structure is connected to the basin frame, a first magnetic gap is formed between the side magnetic structure and the central magnetic structure, the central magnetic structure includes a first central magnetic steel, a first central washer, a second central magnetic steel, a second central washer and a third central magnetic steel which are stacked and connected in sequence from bottom to top, the magnetic cover includes a top plate and a surrounding wall extending downwardly from the edge of the top plate, and a second magnetic gap is formed between the surrounding wall and the central magnetic structure;

[0008] A vibration component, the vibration component includes a sound membrane, a dome, a first voice coil and a second voice coil, the sound membrane includes an inner folding ring portion, a connecting portion, an outer folding ring portion and an outer fixing portion which are sequentially connected from the inside to the outside, the outer fixing portion is connected to the basin frame, the inner edge of the inner folding ring portion is connected to the surrounding wall, the dome is connected to the connecting portion, the first voice coil is located at the first magnetic gap and connected to the bottom surface of the dome, and the second voice coil is located at the second magnetic gap and connected to the top surface of the dome.

[0009] The beneficial effects of the present invention are as follows: the micro-speaker has a novel structure, adopts a dual voice coil structure and the two voice coils are arranged up and down. When the two voice coils each have a magnetic circuit, the two magnetic circuits interact with each other, and the movement directions of the two voice coils are consistent, the driving force of the vibration component is greatly improved, and the acoustic performance of the micro-speaker becomes better; in addition, because the two voice coils are arranged up and down, the area required for the installation of the micro-speaker can be made smaller, which can better meet the development trend of miniaturization of portable electronic devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0011] Figure 1 is a cross-sectional view of a micro-speaker according to a first embodiment of the present invention;

[0012] Figure 2 is a structural schematic diagram of a part of the structure of a micro-speaker according to the first embodiment of the present invention;

[0013] Figure 3 FIG. 1 is a schematic diagram of the internal structure of a micro-speaker according to the first embodiment of the present invention.

[0014] Description of Figure Numbers:

[0015] 1. Basin stand;

[0016] 2. Magnetic circuit assembly; 21. Yoke; 22. Center magnetic structure; 221. First center magnetic steel; 222. First center washer; 223. Second center magnetic steel; 224. Second center washer; 225. Third center magnetic steel; 23. Side magnetic structure; 231. Side magnetic steel; 232. Side washer; 24. Magnetic cover; 241. Top plate; 242. Surrounding wall;

[0017] 3. Vibration assembly; 31. Sound membrane; 311. Inner fixing part; 312. Inner folding ring part; 313. Connecting part; 314. Outer folding ring part; 314. Outer fixing part; 32. Dome; 33. First voice coil; 34. Second voice coil;

[0018] 4. Support components. DETAILED DESCRIPTION

[0019] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indications such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0022] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0023] In addition, if the meaning of "and / or" appears in the full text is to include three parallel solutions, taking "and / or" as an example, it includes solutions, or solutions, or and solutions that are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field 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 invention.

[0024] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] Embodiment 1

[0026] Please refer to Figures 1 to 3, Embodiment 1 of the present invention is: a micro speaker, comprising a basin frame 1, a magnetic circuit component 2 and a vibration component 3, the magnetic circuit component 2 comprising a magnetic cover 24, a yoke 21 and a central magnetic structure 22 and a side magnetic structure 23 respectively arranged on the yoke 21, the side magnetic structure 23 is connected to the basin frame 1, a first magnetic gap is formed between the side magnetic structure 23 and the central magnetic structure 22, the central magnetic structure 22 comprises a first central magnetic steel 221, a first central washer 222, a second central magnetic steel 223, a second central washer 224 and a third central magnetic steel 225 stacked and connected in sequence from bottom to top, the magnetic cover 24 comprises a top plate 241 and a surrounding wall 242 extending downwardly from the edge of the top plate 241, and a gap is formed between the surrounding wall 242 and the central magnetic structure 22. The vibration component 3 comprises a sound membrane 31, a dome 32, a first voice coil 33 and a second voice coil 34, the sound membrane 31 comprises an inner folding ring portion 312, a connecting portion 313, an outer folding ring portion 314 and an outer fixing portion 314 which are sequentially connected from the inside to the outside, the outer fixing portion 314 is connected to the basin frame 1, the inner folding ring portion 312 is convex in the direction away from the yoke 21, the outer folding ring portion 314 is concave in the direction close to the yoke 21, the inner edge of the inner folding ring portion 312 is connected to the surrounding wall 242, the dome 32 is connected to the connecting portion 313, the first voice coil 33 is located at the first magnetic gap and connected to the bottom surface of the dome 32, and the second voice coil 34 is located at the second magnetic gap and connected to the top surface of the dome 32.

[0027] It is easy to understand that the magnetic pole orientation of the first central magnetic steel 221 is opposite to the magnetic pole orientation of the second central magnetic steel 223 , and the magnetic pole orientation of the second central magnetic steel 223 is opposite to the magnetic pole orientation of the third central magnetic steel 225 .

[0028] In order to facilitate the connection between the sound membrane 31 and the magnetic cover 24 and ensure the working stability of the inner folding ring part 312, in this embodiment, the sound membrane 31 also includes an inner fixed part 311 in the shape of a ring frame, and the outer edge of the inner fixed part 311 is connected to the inner edge of the inner folding ring part 312, and the inner edge of the inner folding ring part 312 is indirectly connected to the surrounding wall 242 through the inner fixed part 311, that is, the inner fixed part 311 is connected to the surrounding wall 242.

[0029] Optionally, the inner fixing portion 311 and the bottom surface of the surrounding wall 242, in this embodiment, are adhesively connected to the bottom surface of the surrounding wall 242; in other embodiments, the inner fixing portion 311 and the outer wall surface of the surrounding wall 242 may also be fixedly connected; of course, it is also feasible for the inner fixing portion 311 to be connected to the bottom surface and the outer wall surface of the surrounding wall 242 at the same time.

[0030] The edge magnetic structure 23 includes an edge magnetic steel 231 and an edge washer 232. The edge magnetic steel 231 connects the yoke 21 and the edge washer 232. In some embodiments, the edge magnetic structure 23 is in a continuous ring frame shape as a whole; and in one or more embodiments, the number of the edge magnetic structures 23 is multiple, and the central magnetic structure 22 is located between at least one group of two oppositely arranged edge magnetic structures 23. In this embodiment, the number of the edge magnetic structures 23 is four, and the central magnetic structure 22 is roughly in a rectangular shape. The edge magnetic structures 23 are respectively provided on the four sides of the central magnetic structure 22.

[0031] In order to improve the utilization rate of magnetic force, the side washers 232 are preferably arranged corresponding to the first center washers 222; the bottom surface of the surrounding wall 242 is arranged lower than or flush with the top surface of the second center washers 224. In order to allow the vibration component 3 to have sufficient amplitude to ensure the acoustic performance of the micro speaker, the bottom surface of the surrounding wall 242 is preferably arranged higher than or flush with the bottom surface of the second center washers 224.

[0032] In this embodiment, the size specification of the first voice coil 33 is the same as the size specification of the second voice coil 34 . In other embodiments, the size specification of the first voice coil 33 and the size specification of the second voice coil 34 may also be different.

[0033] In order to share the load of the dome 32, extend the service life of the micro speaker, and improve the polarization phenomenon of the micro speaker, the micro speaker also includes a supporting component 4, which connects the basin frame 1 and the first voice coil 33. The supporting component 4 includes a centering support plate. In other embodiments, the supporting component 4 can also be a secondary membrane; or, the supporting component 4 is a combination of a centering support plate and a secondary membrane.

[0034] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A micro speaker, characterized in that: include basin stand; A magnetic circuit component, the magnetic circuit component includes a magnetic cover, a yoke, and a central magnetic structure and a side magnetic structure respectively arranged on the yoke, the side magnetic structure is connected to the basin frame, a first magnetic gap is formed between the side magnetic structure and the central magnetic structure, the central magnetic structure includes a first central magnetic steel, a first central washer, a second central magnetic steel, a second central washer and a third central magnetic steel which are stacked and connected in sequence from bottom to top, the magnetic cover includes a top plate and a surrounding wall extending downwardly from the edge of the top plate, and a second magnetic gap is formed between the surrounding wall and the central magnetic structure; A vibration component, the vibration component includes a sound membrane, a dome, a first voice coil and a second voice coil, the sound membrane includes an inner folding ring portion, a connecting portion, an outer folding ring portion and an outer fixing portion which are sequentially connected from the inside to the outside, the outer fixing portion is connected to the basin frame, the inner edge of the inner folding ring portion is connected to the surrounding wall, the dome is connected to the connecting portion, the first voice coil is located at the first magnetic gap and connected to the bottom surface of the dome, and the second voice coil is located at the second magnetic gap and connected to the top surface of the dome.

2. The micro-speaker according to claim 1, characterized in that: The sound membrane also includes an inner fixed portion in the shape of a ring frame, the outer edge of the inner fixed portion is connected to the inner edge of the inner folding ring portion, and the inner edge of the inner folding ring portion is indirectly connected to the surrounding wall through the inner fixed portion.

3. The micro-speaker according to claim 2, characterized in that: The inner fixing portion is fixedly connected to the bottom surface and / or the outer wall surface of the surrounding wall.

4. The micro-speaker according to claim 1, characterized in that: The edge magnetic structure includes edge magnetic steel and edge washers, the edge magnetic steel connects the yoke iron and the edge washer, and the edge magnetic structure as a whole is in the shape of a continuous ring frame; or, the number of the edge magnetic structures is multiple, and the central magnetic structure is located between at least one group of two oppositely arranged edge magnetic structures.

5. The micro-speaker according to claim 4, characterized in that: The side washers are arranged corresponding to the first center washers.

6. The micro-speaker according to claim 1, characterized in that: The bottom surface of the surrounding wall is lower than or flush with the top surface of the second center washer.

7. The micro-speaker according to claim 6, characterized in that: The bottom surface of the surrounding wall is higher than or flush with the bottom surface of the second center washer.

8. The micro-speaker according to claim 1, characterized in that: The inner folding ring portion is convex outwardly in a direction away from the yoke, and the outer folding ring portion is concave inwardly in a direction close to the yoke.

9. The micro-speaker according to claim 1, characterized in that: The size specification of the first voice coil is the same as or different from the size specification of the second voice coil.

10. The micro-speaker according to claim 1, characterized in that: It also includes a supporting assembly, which connects the basin frame and the first voice coil, and the supporting assembly includes a centering support plate and / or an auxiliary membrane.

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