Miniature loudspeaker

Abstract

The utility model discloses a miniature loudspeaker, which comprises a diaphragm assembly, a magnetic circuit assembly and a first connecting auxiliary diaphragm, and is characterized in that the diaphragm assembly comprises an inner fixing part, a first folding ring part and an outer fixing part which are sequentially connected from inside to outside, and the inner fixing part is provided with a first window; the magnetic circuit assembly is connected with the outer fixing part and comprises a yoke, a plurality of additional magnetic structures and a plurality of central magnetic structures, the additional magnetic structures and the central magnetic structures are arranged on the yoke, and the additional magnetic structures are located between every two adjacent central magnetic structures and correspond to the first windows; the additional magnetic structure comprises additional lower magnetic steel, an additional washer and additional upper magnetic steel which are sequentially connected from bottom to top; and the top of the additional upper magnetic steel and the bottom of the additional lower magnetic steel have the same magnetic pole polarity. The miniature loudspeaker is novel in structure, the additional magnetic structure is additionally arranged between the two adjacent central magnetic structures, and the additional magnetic structure is provided with the additional upper magnetic steel and the additional lower magnetic steel which are opposite in polarity and are stacked, so that the magnetic flux of the magnetic circuit assembly is enhanced, and the performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electroacoustic converters, in particular to a miniature loudspeaker. Background Art

[0002] Nowadays, mobile terminals such as mobile phones and tablets enrich people's lives, and micro speakers play an indispensable role as audio devices.

[0003] In order to improve the performance of micro speakers, micro speakers with multi-voice coil architecture came into being. Compared with micro speakers with single voice coil architecture, micro speakers with multi-voice coil architecture have larger BL value and better acoustic performance. However, in the face of increasingly stringent requirements for micro speakers in electronic devices such as mobile phones, the performance of micro speakers with multi-voice coil architecture needs to be further improved. Utility Model Content

[0004] The technical problem solved by the utility model is to provide a high-performance multi-voice coil micro loudspeaker.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a miniature speaker, comprising:

[0006] A diaphragm assembly, the diaphragm assembly comprising an inner fixing portion, a first folding ring portion and an outer fixing portion which are sequentially connected from the inside to the outside, and a first window is provided on the inner fixing portion;

[0007] A magnetic circuit component, the magnetic circuit component is connected to the external fixing part, the magnetic circuit component includes a yoke, a plurality of additional magnetic structures and a plurality of central magnetic structures, the additional magnetic structures and the central magnetic structure are both arranged on the yoke, the additional magnetic structure is located between two adjacent central magnetic structures and corresponds to the first opening, the additional magnetic structure includes an additional lower magnetic steel, an additional washer and an additional upper magnetic steel sequentially connected from bottom to top, and the top of the additional upper magnetic steel has the same magnetic pole polarity as the bottom of the additional lower magnetic steel;

[0008] The first connecting auxiliary film includes a second folding ring portion, the second folding ring portion is arranged along the edge of the first window, and the second folding ring portion respectively connects the additional upper magnetic steel and the internal fixed portion to close the gap between the additional magnetic structure and the first window.

[0009] In one embodiment, a top edge of the additional upper magnetic steel is provided with an avoidance structure for avoiding the second folding ring portion.

[0010] In one embodiment, the avoidance structure is an obtuse angle structure, a rounded angle structure or a stepped structure.

[0011] In one embodiment, the central magnetic structure includes a central magnetic steel and a central washer, the central washer is located above the central magnetic steel, the central magnetic steel is respectively connected to the central washer and the yoke iron, the central washer corresponds to the additional washer, and the bottom of the central magnetic steel has an opposite magnetic pole polarity to the bottom of the additional lower magnetic steel.

[0012] In one embodiment, the center magnetic steel also includes a top magnetic steel, the bottom surface of the top magnetic steel is connected to the top surface of the center washer, a second window is further provided on the inner fixed portion, the top magnetic steel is arranged corresponding to the second window, and also includes a second connecting sub-membrane closing the second window, the second connecting sub-membrane includes a convex cap and a third folding ring portion arranged around the convex cap, the third folding ring portion protrudes in a direction away from the center washer, the inner edge of the third folding ring portion is connected to the convex cap, the outer edge of the third folding ring portion is connected to the inner fixed portion, the top surface of the top magnetic steel is connected to the inner top surface of the convex cap, and the top of the top magnetic steel has the same magnetic pole polarity as the bottom of the center magnetic steel.

[0013] In one embodiment, the top magnetic steel is in a convex shape as a whole.

[0014] In one embodiment, a space-avoiding structure for avoiding the third folding ring portion is provided on the top magnetic steel.

[0015] In one embodiment, the air avoidance structure is an obtuse angle structure, a rounded angle structure or a stepped structure.

[0016] In one embodiment, the top magnetic steel includes a connected lower magnetic steel and an upper magnetic steel, the upper magnetic steel is located inside the convex cap, the lower magnetic steel is located below the convex cap, the peripheral wall of the upper magnetic steel is fixedly connected to the inner peripheral wall of the convex cap, and the top surface of the upper magnetic steel is fixedly connected to the inner top surface of the convex cap.

[0017] In one embodiment, the inner edge of the third folding ring portion is connected to the top surface of the lower magnetic steel.

[0018] The beneficial effects of the present invention are as follows: the micro-speaker has a novel structure, an additional magnetic structure is added between two adjacent central magnetic structures, and the additional magnetic structure has an additional upper magnetic steel and an additional lower magnetic steel with opposite polarities and stacked, which greatly enhances the magnetic flux of the magnetic circuit component, is beneficial to improving the BL value of the micro-speaker, enhances the performance of the micro-speaker, and can effectively improve the consumer experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the overall structure of the micro-speaker according to the first embodiment of the present utility model;

[0021] Figure 2 is a cross-sectional view of the micro-speaker of the first embodiment of the utility model;

[0022] Figure 3 This is a schematic diagram of the internal structure of the micro-speaker according to the first embodiment of the present invention.

[0023] Description of Figure Numbers:

[0024] 1. diaphragm assembly; 11. inner fixing portion; 12. first folding ring portion; 13. outer fixing portion;

[0025] 2. The first connecting auxiliary film;

[0026] 3. Magnetic circuit assembly; 31. Yoke iron; 32. Side magnetic structure; 321. Side magnetic steel; 322. Ring washer; 33. Additional magnetic structure; 331. Additional lower magnetic steel; 332. Additional washer; 333. Additional upper magnetic steel; 334. Avoidance structure; 34. Center magnetic structure; 341. Center magnetic steel; 342. Center washer; 343. Top magnetic steel; 3431. Upper magnetic steel; 3432. Lower magnetic steel; 3433. Avoidance structure;

[0027] 4. Voice coil;

[0028] 5. Second connecting auxiliary film; 51. Protruding cap; 52. Third folding ring portion. DETAILED DESCRIPTION

[0029] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] 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.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, 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.

[0033] 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 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 scope of protection required by this utility model.

[0034] 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.

[0035] Embodiment 1

[0036] Please refer to Figures 1 to 3 , Embodiment 1 of the present utility model is: a micro speaker, comprising a diaphragm assembly 1, a first connected sub-diaphragm 2, a magnetic circuit assembly 3 and a plurality of voice coils 4, the diaphragm assembly 1 having an inner fixing portion 11, a first folding ring portion 12 and an outer fixing portion 13 sequentially connected from the inside to the outside, the inner fixing portion 11 being provided with a first window, the voice coil 4 being fixedly connected to the diaphragm assembly 1, specifically, the voice coil 4 being fixedly connected to the inner fixing portion 11, in this embodiment, the diaphragm assembly 1 comprises a sound membrane and a dome provided on the sound membrane, in a specific product, it is also acceptable for the diaphragm assembly 1 not to have the dome.

[0037] The magnetic circuit component 3 is connected to the external fixing part 13. Specifically, the magnetic circuit component 3 includes a yoke 31 and side magnetic structures 32, a plurality of additional magnetic structures 33 and a plurality of central magnetic structures 34 respectively arranged on the yoke 31. The number of the voice coils 4 is the same as the number of the central magnetic structures 34 and is arranged one by one. The side magnetic structure 32 includes an annular washer 322 and at least two side magnetic steels 321 arranged opposite to each other. The annular washer 322 includes a ring frame portion and a surrounding wall portion in the shape of a ring frame. The surrounding wall portion is continuously arranged along the outer edge of the ring frame portion. The ring frame structure is formed by connecting the surrounding wall portion to the external fixing portion 13, the bottom surface of the side magnetic steel 321 is connected to the yoke 31, and the top surface of the side magnetic steel 321 is connected to the bottom surface of the ring frame portion; the additional magnetic structure 33 is located between the two adjacent central magnetic structures 34 and corresponds to the first opening window, and the additional magnetic structure 33 includes an additional lower magnetic steel 331, an additional washer 332 and an additional upper magnetic steel 333 which are sequentially connected from bottom to top, and the top of the additional upper magnetic steel 333 has the same magnetic pole polarity as the bottom of the additional lower magnetic steel 331;

[0038] The first connecting auxiliary membrane 2 includes a second folding ring portion, which protrudes in a direction away from the yoke 31, and is arranged along the edge of the first window. The second folding ring portion respectively connects the additional upper magnetic steel 333 and the internal fixed portion 11 to close the gap between the additional magnetic structure 33 and the first window.

[0039] In order to take into account the overall volume of the additional magnetic structure 33 and the working stability of the first connecting auxiliary membrane 2, the top edge of the additional upper magnetic steel 333 is provided with an avoidance structure 334 for avoiding the second folding ring part, and the avoidance structure 334 is an obtuse angle structure, a rounded angle structure or a stepped structure.

[0040] Furthermore, the central magnetic structure 34 includes a central magnetic steel 341 and a central washer 342. The central washer 342 is located above the central magnetic steel 341. The central magnetic steel 341 connects the central washer 342 and the yoke 31 respectively. The central washer 342 corresponds to the additional washer 332. The bottom of the central magnetic steel 341 has an opposite magnetic pole polarity to the bottom of the additional lower magnetic steel 331.

[0041] In order to further improve the magnetic field strength of the central magnetic steel 341 without increasing the overall cross-sectional thickness of the micro-speaker, thereby improving the performance of the micro-speaker to a greater extent, in this embodiment, the central magnetic steel 341 also includes a top magnetic steel 343, the bottom surface of the top magnetic steel 343 is connected to the top surface of the central washer 342, and a second window is further provided on the inner fixed portion 11, and the top magnetic steel 343 is arranged corresponding to the second window. The micro-speaker also includes a second connecting auxiliary membrane 5 for closing the second window, and the second connecting auxiliary membrane 5 includes a convex cap 51 and a third folding ring portion 52 arranged around the convex cap 51, and the third folding ring portion 52 protrudes in a direction away from the central washer 342, and the inner edge of the third folding ring portion 52 is connected to the convex cap 51, and the outer edge of the third folding ring portion 52 is connected to the inner fixed portion 11, and the top surface of the top magnetic steel 343 is connected to the inner top surface of the convex cap 51, and the top of the top magnetic steel 343 has the same magnetic pole polarity as the bottom of the central magnetic steel 341.

[0042] In order to increase the overall volume of the top magnetic steel 343, the top magnetic steel 343 is in a convex shape as a whole. A clearance structure 3433 for avoiding the third folding ring portion 52 is provided on the top magnetic steel 343. The clearance structure 3433 is an obtuse angle structure, a rounded angle structure or a stepped structure.

[0043] Optionally, the top magnetic steel 343 includes a connected lower magnetic steel 3432 and an upper magnetic steel 3431, the upper magnetic steel 3431 is located inside the convex cap 51, the lower magnetic steel 3432 is located below the convex cap 51, the peripheral wall of the upper magnetic steel 3431 is fixedly connected to the inner peripheral wall of the convex cap 51, the top surface of the upper magnetic steel 3431 is fixedly connected to the inner top surface of the convex cap 51, and the air avoidance structure 3433 is arranged at the top edge of the lower magnetic steel 3432.

[0044] The inner edge of the third folding ring portion 52 is connected to the top surface of the lower magnetic steel 3432, so that the structural stability of the micro speaker can be improved.

[0045] 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 utility model concept, or directly / indirectly used 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 A diaphragm assembly, the diaphragm assembly comprising an inner fixing portion, a first folding ring portion and an outer fixing portion which are sequentially connected from the inside to the outside, and a first window is provided on the inner fixing portion; A magnetic circuit component, the magnetic circuit component is connected to the external fixing part, the magnetic circuit component includes a yoke, a plurality of additional magnetic structures and a plurality of central magnetic structures, the additional magnetic structures and the central magnetic structure are both arranged on the yoke, the additional magnetic structure is located between two adjacent central magnetic structures and corresponds to the first opening, the additional magnetic structure includes an additional lower magnetic steel, an additional washer and an additional upper magnetic steel sequentially connected from bottom to top, and the top of the additional upper magnetic steel has the same magnetic pole polarity as the bottom of the additional lower magnetic steel; The first connecting auxiliary film includes a second folding ring portion, the second folding ring portion is arranged along the edge of the first window, and the second folding ring portion respectively connects the additional upper magnetic steel and the internal fixed portion to close the gap between the additional magnetic structure and the first window.

2. The micro-speaker according to claim 1, characterized in that: The top edge of the additional upper magnetic steel is provided with an avoidance structure for avoiding the second folding ring portion.

3. The micro-speaker according to claim 2, characterized in that: The avoidance structure is an obtuse angle structure, a rounded angle structure or a stepped structure.

4. The micro-speaker according to claim 1, characterized in that: The central magnetic structure includes a central magnetic steel and a central washer. The central washer is located above the central magnetic steel. The central magnetic steel is respectively connected to the central washer and the yoke iron. The central washer corresponds to the additional washer. The bottom of the central magnetic steel has an opposite magnetic pole polarity to the bottom of the additional lower magnetic steel.

5. The micro-speaker according to claim 4, characterized in that: The central magnetic steel also includes a top magnetic steel, the bottom surface of which is connected to the top surface of the central washer, a second window is further provided on the inner fixed portion, the top magnetic steel is arranged corresponding to the second window, and further includes a second connecting auxiliary film for closing the second window, the second connecting auxiliary film includes a convex cap and a third folding ring portion arranged around the convex cap, the third folding ring portion protrudes in a direction away from the central washer, the inner edge of the third folding ring portion is connected to the convex cap, the outer edge of the third folding ring portion is connected to the inner fixed portion, the top surface of the top magnetic steel is connected to the inner top surface of the convex cap, and the top of the top magnetic steel has the same magnetic pole polarity as the bottom of the central magnetic steel.

6. The micro-speaker according to claim 5, characterized in that: The top magnetic steel is in a convex shape as a whole.

7. The micro-speaker according to claim 6, characterized in that: The top magnetic steel is provided with a space-avoiding structure for avoiding the third folding ring portion.

8. The micro-speaker according to claim 7, characterized in that: The air avoidance structure is an obtuse angle structure, a rounded angle structure or a stepped structure.

9. The micro-speaker according to claim 6, characterized in that: The top magnetic steel includes a connected lower magnetic steel and an upper magnetic steel, the upper magnetic steel is located inside the convex cap, the lower magnetic steel is located below the convex cap, the peripheral wall of the upper magnetic steel is fixedly connected to the inner peripheral wall of the convex cap, and the top surface of the upper magnetic steel is fixedly connected to the inner top surface of the convex cap.

10. The micro-speaker according to claim 9, characterized in that: The inner edge of the third folding ring portion is connected to the top surface of the lower magnetic steel.

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