A miniature speaker

Abstract

The present invention discloses a micro-speaker comprising a magnetic circuit assembly and two concave voice coils. The magnetic circuit assembly comprises a yoke, a central magnetic structure and an annular magnetic structure, each disposed on the yoke. The central magnetic structure is located within the annular magnetic structure. The central magnetic structure comprises two central magnets and two central washers, each corresponding to the two concave voice coils. The central magnets and the center washers are concave in shape, and the two central magnets are mirror-symmetrical. The yoke is provided with a window, located between the two central magnets. The edges of the window are provided with a magnetic flange, forming a gap between the magnetic flange and the central magnet for partial movement of the concave voice coils. The central magnet connects the center washers to the yoke. The annular magnetic structure comprises an outer washer and an annular magnet, connecting the outer washers to the yoke. This micro-speaker has excellent performance.

Description

Technical Field

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

[0002] Micro speakers are widely used in portable electronic devices such as mobile phones, laptops, and hearing aids. With the rapid development of these portable electronic devices, people are increasingly demanding the micro electroacoustic devices used in them. Currently, large-amplitude speakers or super-linear speakers are becoming more and more popular in speakers and receivers.

[0003] With the development of society, micro speakers need to improve higher performance in a limited space. Traditional micro speakers with a single voice coil structure have maximized their performance. In order to further improve the performance of micro speakers, micro speakers with a dual voice coil structure have been applied. However, due to the large magnetic gap in the middle of the dual voice coil micro speaker (need to accommodate the adjacent sides of the two voice coils), the BL cannot be maximized. In other words, there is still room for further improvement in the performance of the micro speakers with a dual voice coil structure. Summary of the Invention

[0004] The main purpose of the present invention is to provide a novel micro-speaker, aiming to solve the problem that the performance of the existing micro-speaker with a dual voice coil structure is unsatisfactory.

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

[0006] two concave voice coils;

[0007] A magnetic circuit assembly, the magnetic circuit assembly comprising a yoke and a central magnetic structure and an annular magnetic structure respectively provided on the yoke, the central magnetic structure being located within the annular magnetic structure;

[0008] The central magnetic structure includes two central magnets and two central washers. The two central magnets correspond one to one with the two concave voice coils. The central magnets and the central washers are concave in shape. The two central magnets are mirror-symmetrical. A window is provided on the yoke. The window is located between the two central magnets. A magnetic flange is provided on the edge of the window. A gap is formed between the magnetic flange and the central magnet to allow partial movement of the concave voice coil. The central magnet connects the central washers and the yoke.

[0009] The annular magnetic structure includes an outer washer and an annular magnetic steel, and the annular magnetic steel connects the outer washer and the yoke.

[0010] The beneficial effects of the present invention are: compared with the traditional rectangular voice coil, the micro-speaker adopts a concave voice coil, which can effectively increase the total length of the voice coil (L value). At the same time, a window is set at the recessed position of the yoke corresponding to the central magnetic structure and a magnetic flange is set at the edge of the window. The magnetic flange can make up for the B value of the magnetic circuit component, thereby improving the magnetic field utilization rate of the magnetic circuit component. In addition, the window on the yoke can be used as a leakage hole, so that the outer side of the corner of the voice coil does not need to be evacuated by the magnetic structure to set the leakage hole, so that the magnetic circuit component can adopt an annular magnetic structure, so that the magnetic force at the corner position of the voice coil is maximized, thereby further improving the B value of the magnetic circuit component, so that the BL value can be maximized, thereby improving the performance of the micro-speaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] 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.

[0012] Figure 1 An exploded view of the micro-speaker according to the first embodiment of the present invention;

[0013] Figure 2 is a cross-sectional view of a micro-speaker according to a first embodiment of the present invention;

[0014] 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.

[0015] Description of Figure Numbers:

[0016] 1. Basin rack;

[0017] 2. Diaphragm assembly;

[0018] 3. Concave voice coil;

[0019] 4. Yoke; 41. Window; 42. Magnetic flange;

[0020] 5. Center magnetic structure; 51. Center magnetic steel; 52. Center washer; 521. Avoidance pressure edge;

[0021] 6. Ring magnetic structure; 61. Ring magnetic steel; 62. External washer;

[0022] 71. gap; 72. gap;

[0023] 8. Centering support piece. DETAILED DESCRIPTION

[0024] 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.

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] 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 various components under a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0027] In addition, if the embodiments of the present invention include descriptions of "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of such features.

[0028] In addition, if the word "and / or" appears throughout the text, it means that three parallel solutions are included. For example, "and / or" includes solutions, or solutions, or solutions that are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that a person of ordinary skill in the art can implement them. If the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0030] Example 1

[0031] Please refer to Figures 1 to 3 , Embodiment 1 of the present invention is: a micro speaker that can be widely used in electronic devices such as mobile phones, laptop computers, and hearing aids.

[0032] The micro speaker includes a frame 1 and a vibration assembly and a magnetic circuit assembly respectively arranged on the frame 1. The vibration assembly includes a diaphragm assembly 2 and two concave voice coils 3 arranged on the diaphragm assembly 2. The diaphragm assembly 2 is connected to the frame 1. The magnetic circuit assembly includes a yoke 4 and a central magnetic structure 5 and an annular magnetic structure 6 respectively arranged on the yoke 4. The central magnetic structure 5 is located within the annular magnetic structure 6.

[0033] The central magnetic structure 5 includes two central magnetic steels 51 and two central washers 52. The two central magnetic steels 51 correspond one-to-one to the two concave voice coils 3. The central magnetic steels 51 and the central washers 52 are respectively concave in shape. The two central magnetic steels 51 are mirror-symmetrical. The two central magnetic steels 51 have the same polarity (that is, the same magnetic pole direction). A window 41 is provided on the yoke 4. The window 41 is located between the two central magnetic steels 51. A magnetic flange 42 is provided on the edge of the window 41. A gap 71 is formed between the magnetic flange 42 and the central magnetic steel 51 for partial movement of the concave voice coil 3. The central magnetic steel 51 connects the central washers 52 and the yoke 4. The annular magnetic structure 6 includes an outer washer 62 and an annular magnetic steel 61. The annular magnetic steel 61 connects the outer washer 62 and the yoke 4.

[0034] Optionally, the magnetic flange 42 is perpendicular to other areas of the yoke 4. Of course, it is also possible that the magnetic flange 42 and the yoke 4 form an angle slightly smaller or slightly larger than 90°.

[0035] To facilitate production and assembly, the annular magnetic steel 61 is preferably a continuous, complete annular structure; the outer washer 62 is annular as a whole, and optionally, the outer washer 62 and the basin frame 1 are an integrated structure formed by insert injection molding.

[0036] A gap 72 is formed between the two center magnets 51 and connects to the gap 71. Part of the two concave voice coils 3 move in the gap 72. Since the gap 71 only needs to accommodate unilateral movement of the concave voice coil 3, while the gap 72 needs to accommodate unilateral movement of both concave voice coils 3, the width of the gap 71 can be set to be smaller than the width of the gap 72, thereby increasing the effective magnetic field strength of the magnetic circuit assembly.

[0037] To improve the operational synchronization of the two concave voice coils 3 and thus enhance the acoustic performance of the microspeaker, the outer walls of the convex regions of the two concave voice coils 3 are optionally connected. Specifically, the outer walls of the convex regions of the two concave voice coils 3 are bonded together. The specific method of bonding and fixing can be glue or double-sided tape. Moreover, when the concave voice coils 3 are wound with enameled wire, the outer walls of the convex regions of the two concave voice coils 3 can also be bonded together using the self-adhesive layer on the surface of the enameled wire. Specifically, when the two concave voice coils 3 are bonded together, the bonding areas of the two concave voice coils 3 are located within the gap 72.

[0038] To further improve the acoustic performance of the microspeaker, the recessed area of the central magnetic steel 51 is preferably positioned at the center of one of its long sides. In other embodiments, the recessed area of the central magnetic steel 51 may be slightly offset from the center of the long side of the central magnetic steel 51. This can be adjusted based on actual needs.

[0039] In order to prevent the connecting adhesive structure between the diaphragm assembly 2 and the concave voice coil 3 from colliding with the center washer 52 during operation, optionally, an edge of the top surface of the center washer 52 is provided with an avoidance pressure edge 521 .

[0040] Specifically, the magnetic flange 42 is a folded structure formed by folding a portion of the yoke 4. In this embodiment, the window 41 is rectangular, and the magnetic flange 42 is provided on all four sides of the window 41. In other embodiments, the window 41 can also have other shapes, such as a pentagon. Furthermore, the edges of the window 41 do not necessarily need to contact the magnetic flange 42 in every area. For example, it is feasible to provide the magnetic flange 42 only on a set of opposite sides of the window 41.

[0041] In other embodiments, the magnetic flange 42 and the yoke 4 may be independent split structures. In this case, the magnetic flange 42 is connected and fixed to the yoke 4 by clamping, riveting, bonding, welding or fastening with fasteners.

[0042] As a preferred embodiment, the window 41 is located in the center of the yoke 4 . The window 41 being located in the center of the yoke 4 can make the airflow distribution reasonable when the micro speaker is working, thereby improving the polarization phenomenon of the diaphragm assembly 2 .

[0043] In order to improve the rolling vibration and polarization phenomena of the concave voice coil 3, optionally, the vibration assembly also includes a centering support plate 8, and the centering support plate 8 includes an inner mounting portion, a cantilever and an outer mounting portion connected in sequence from the inside to the outside, the outer mounting portion connects the diaphragm assembly 2 and the basin frame 1, and the inner mounting portion connects the diaphragm assembly 2 and the concave voice coil 3, that is, the concave voice coil 3 is indirectly connected to the diaphragm assembly 2 through the centering support plate 8.

[0044] The above are only optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application 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 two concave voice coils; A magnetic circuit assembly, the magnetic circuit assembly comprising a yoke and a central magnetic structure and an annular magnetic structure respectively provided on the yoke, the central magnetic structure being located within the annular magnetic structure; The central magnetic structure includes two central magnets and two central washers. The two central magnets correspond one to one with the two concave voice coils. The central magnets and the central washers are concave in shape. The two central magnets are mirror-symmetrical. A window is provided on the yoke. The window is located between the two central magnets. A magnetic flange is provided on the edge of the window. A gap is formed between the magnetic flange and the central magnet to allow partial movement of the concave voice coil. The central magnet connects the central washers and the yoke. The annular magnetic structure includes an outer washer and an annular magnetic steel, and the annular magnetic steel connects the outer washer and the yoke.

2. The micro-speaker according to claim 1, wherein: The annular magnetic steel is a continuous and complete annular structure.

3. The micro-speaker according to claim 1, wherein: The outer washer is annular as a whole.

4. The micro-speaker according to claim 1, wherein: The window is rectangular, and the four sides of the window are all provided with the magnetic flanges.

5. The micro-speaker according to claim 1, wherein: The window is located at the center of the yoke.

6. The micro-speaker according to claim 1, wherein: The magnetic flange is a folded structure formed by folding a part of the yoke.

7. The micro-speaker according to claim 1, wherein: The edge of the top surface of the center washer is provided with an avoidance pressing edge.

8. The micro-speaker according to claim 1, wherein: The outer walls of the convex areas of the two concave voice coils are connected.

9. The micro-speaker according to claim 8, wherein: The outer walls of the convex areas of the two concave voice coils are bonded and fixed.

10. The micro-speaker according to claim 1, wherein: It also includes a diaphragm assembly and a basin frame, the basin frame connects the magnetic circuit assembly and the diaphragm assembly, and the concave voice coil is connected to the diaphragm assembly.

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