Miniature loudspeaker

Abstract

The miniature loudspeaker comprises a vibration assembly, an upper magnetic circuit assembly, a lower magnetic circuit assembly and an outer magnetic circuit assembly, the vibration assembly comprises a middle paste, an upper voice coil, a lower voice coil, an upper vibrating diaphragm and a lower vibrating diaphragm, the upper vibrating diaphragm and the lower vibrating diaphragm are respectively annular, the upper voice coil and the lower voice coil are respectively connected with the middle paste, the middle paste is located between the upper voice coil and the lower voice coil, and the outer magnetic circuit assembly is located between the upper voice coil and the lower voice coil. The upper voice coil is connected with the upper diaphragm, and the lower voice coil is connected with the lower diaphragm. The upper magnetic circuit assembly comprises an upper magnetic conductive cover and an upper central magnetic structure which are connected, the upper magnetic conductive cover is connected with the upper vibrating diaphragm, and the upper magnetic circuit assembly is provided with an exhaust hole penetrating through the bottom surface of the upper central magnetic structure and the top surface of the upper magnetic conductive cover; the lower magnetic circuit assembly comprises a lower magnetic conductive cover and a lower center magnetic structure which are connected, the lower magnetic conductive cover is connected with the lower vibrating diaphragm, the lower magnetic circuit assembly is provided with an inner cavity, sound absorption particles are arranged in the inner cavity, and the top face of the lower magnetic circuit assembly is provided with air holes communicated with the inner cavity. The miniature loudspeaker is novel in structure and good in acoustic performance.

Description

Technical Field

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

[0002] Micro speakers are widely used in portable electronic devices such as mobile phones, laptops, hearing aids, etc. With the rapid development of these portable electronic devices, people have higher and higher requirements on the sound pressure level of micro electroacoustic devices used in them.

[0003] In the prior art, most micro speakers have only one voice coil, with very limited driving force and low sound pressure level. A small number of micro speakers have multiple voice coils arranged side by side, but their actual driving force increase is still relatively limited, and they need to occupy a large lateral space, which is not well suitable for electronic devices with limited lateral installation space.

[0004] In addition, as electronic devices become thinner and lighter, the space inside the micro speaker is very limited, which makes the low-frequency performance of the micro speaker unsatisfactory. Utility Model Content

[0005] The technical problem solved by the utility model is to provide a high-performance micro speaker.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: a miniature speaker, comprising:

[0007] A vibration component, the vibration component includes a middle sticker, an upper voice coil, a lower voice coil, an upper diaphragm and a lower diaphragm, the upper diaphragm and the lower diaphragm are respectively ring-shaped, the upper voice coil and the lower voice coil are respectively connected to the middle sticker, the middle sticker is located between the upper voice coil and the lower voice coil, the upper voice coil is connected to the upper diaphragm, and the lower voice coil is connected to the lower diaphragm;

[0008] An upper magnetic circuit component, the upper magnetic circuit component comprising an upper magnetic conductive cover and an upper central magnetic structure connected to each other, the upper magnetic conductive cover being connected to the upper diaphragm, and the upper magnetic circuit component having an exhaust hole penetrating the bottom surface of the upper central magnetic structure and the top surface of the upper magnetic conductive cover;

[0009] A lower magnetic circuit component, the lower magnetic circuit component comprises a lower magnetic conductive cover and a lower central magnetic structure connected to each other, the lower magnetic conductive cover is connected to the lower diaphragm, the lower magnetic circuit component has an inner cavity, and a top surface of the lower magnetic circuit component is provided with an air hole connected to the inner cavity;

[0010] Sound-absorbing particles, the sound-absorbing particles are arranged in the inner cavity;

[0011] The external magnetic circuit component includes an annular external magnetic steel, an upper annular magnetic conductive bracket and a lower annular magnetic conductive bracket. The upper annular magnetic conductive bracket connects the annular external magnetic steel and the upper diaphragm, and the lower annular magnetic conductive bracket connects the annular external magnetic steel and the lower diaphragm.

[0012] In one embodiment, the lower center magnetic structure includes a lower annular magnetic steel and a lower center washer, the bottom surface of the lower annular magnetic steel is connected to the lower magnetic conductive cover, the top surface of the lower annular magnetic steel is connected to the lower center washer, the lower annular magnetic steel, the lower center washer and the lower magnetic conductive cover together form the inner cavity, and the air hole is arranged on the lower center washer.

[0013] In one embodiment, the lower central magnetic structure further includes a breathable spacer, and the breathable spacer is disposed at the breathable hole.

[0014] In one embodiment, the breathable isolation element is a steel mesh or a mesh cloth.

[0015] In one embodiment, a mounting groove for mounting the breathable isolation member is provided on the lower center washer, and the mounting groove is arranged around the breathable hole.

[0016] In one embodiment, an upper sealing cover is provided on the upper magnetic conductive cover, the upper sealing cover is located at the end of the exhaust hole, and a plurality of holes connected to the exhaust hole are provided on the upper sealing cover.

[0017] In one embodiment, the upper magnetic conductive cover and the upper sealing cover are an integral structure formed by integral processing.

[0018] In one embodiment, it also includes an upper centering support plate, which includes an upper inner fixing portion, an upper cantilever and an upper outer fixing portion which are sequentially connected from the inside to the outside, the upper diaphragm is connected to the upper voice coil via the upper inner fixing portion, and the upper annular magnetic conductive bracket is connected to the upper diaphragm via the upper outer fixing portion.

[0019] In one embodiment, it also includes a lower centering support plate, which includes a lower inner fixing portion, a lower cantilever and a lower outer fixing portion which are sequentially connected from the inside to the outside, the lower diaphragm is connected to the lower voice coil via the lower inner fixing portion, and the lower annular magnetic conductive bracket is connected to the lower diaphragm via the lower outer fixing portion.

[0020] In one embodiment, the upper magnetic conductive cover is provided with an upper avoidance groove for avoiding the upper diaphragm; and / or the lower magnetic conductive cover is provided with a lower avoidance groove for avoiding the lower diaphragm.

[0021] The beneficial effects of the utility model are:

[0022] The micro speaker has a novel structure. The middle sticker is driven by the upper voice coil and the lower voice coil, which effectively improves the driving force, so that the middle sticker can more strongly mobilize the air to produce sound, thereby improving the sound pressure level of the micro speaker and achieving the purpose of improving the acoustic performance of the micro speaker.

[0023] The middle sticker is built into the micro speaker, and the vibration device cannot be seen from the outside, so the diaphragm and the middle sticker can be fully protected;

[0024] The upper voice coil and the lower voice coil are suspended by the upper diaphragm and the lower diaphragm respectively, which is conducive to better ensuring the stability of the vibration of the upper voice coil and the lower voice coil;

[0025] The lower center magnetic structure is filled with sound-absorbing particles, which helps to reduce the F0 value of the micro speaker, thereby improving the low-frequency performance of the micro speaker, and further improving the acoustic performance of the micro speaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 It is a cross-sectional view of the micro-speaker according to the first embodiment of the present utility model.

[0028] Description of Figure Numbers:

[0029] 11. Middle sticker; 12. Upper voice coil; 13. Lower voice coil; 14. Upper diaphragm; 15. Lower diaphragm;

[0030] 21. upper magnetic shield; 211. upper cover; 212. upper avoidance groove; 22. upper central magnetic structure; 23. exhaust hole;

[0031] 31. lower magnetic shield; 311. lower avoidance groove; 32. lower central magnetic structure; 321. inner cavity; 322. mounting groove;

[0032] 41. annular outer magnetic steel; 42. upper annular magnetic support; 43. lower annular magnetic support;

[0033] 51. Upper centering support piece; 52. Lower centering support piece;

[0034] 6. Breathable isolation parts;

[0035] 7. Sound-absorbing particles. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] Embodiment 1

[0043] Please refer to Figure 1, Embodiment 1 of the present utility model is: a miniature speaker that can be applied to electronic products that can make sounds, such as mobile phones, laptop computers, and hearing aids.

[0044] The micro speaker includes a vibration component, an upper magnetic circuit component, a lower magnetic circuit component, sound-absorbing particles 7 and an outer magnetic circuit component. The vibration component includes a middle sticker 11, an upper voice coil 12, a lower voice coil 13, an upper diaphragm 14 and a lower diaphragm 15. The upper diaphragm 14 and the lower diaphragm 15 are respectively annular. The upper voice coil 12 and the lower voice coil 13 are respectively connected to the middle sticker 11. The middle sticker 11 is located between the upper voice coil 12 and the lower voice coil 13. The upper voice coil 12 is connected to the upper diaphragm 14, and the lower voice coil 13 is connected to the lower diaphragm 15.

[0045] The upper magnetic circuit assembly includes an upper magnetic conductive cover 21 and an upper central magnetic structure 22 connected to each other, the upper magnetic conductive cover 21 is connected to the upper diaphragm 14, and the upper magnetic circuit assembly has an exhaust hole 23 penetrating the bottom surface of the upper central magnetic structure 22 and the top surface of the upper magnetic conductive cover 21;

[0046] The lower magnetic circuit component includes a connected lower magnetic conductive cover 31 and a lower central magnetic structure 32, the lower magnetic conductive cover 31 is connected to the lower diaphragm 15, the lower magnetic circuit component has an inner cavity 321, and the top surface of the lower magnetic circuit component is provided with air holes connected to the inner cavity 321, the sound-absorbing particles 7 are arranged in the inner cavity 321, the sound-absorbing particles 7 are used to increase the virtual back cavity of the micro speaker, and the sound-absorbing particles 7 can also be called Bass particles.

[0047] The outer magnetic circuit assembly includes an annular outer magnetic steel 41, an upper annular magnetic conductive bracket 42 and a lower annular magnetic conductive bracket 43, wherein the upper annular magnetic conductive bracket 42 connects the annular outer magnetic steel 41 and the upper diaphragm 14, and the lower annular magnetic conductive bracket 43 connects the annular outer magnetic steel 41 and the lower diaphragm 15;

[0048] The middle sticker 11 is located between the upper center magnetic structure 22 and the lower center magnetic structure 32. An upper magnetic gap for the upper voice coil 12 to move is formed between the upper center magnetic structure 22 and the external magnetic circuit assembly. A lower magnetic gap for the lower voice coil 13 to move is formed between the lower center magnetic structure 32 and the external magnetic circuit assembly. The upper center magnetic structure 22 includes an upper center washer and an upper center magnetic steel. The upper center magnetic steel connects the upper center washer and the upper magnetic conductive cover 21. The lower center magnetic structure 32 includes a lower annular magnetic steel and a lower center washer. The bottom surface of the lower annular magnetic steel is connected to the lower magnetic conductive cover 31. The top surface of the lower annular magnetic steel is connected to the lower center washer. The lower annular magnetic steel, the lower center washer and the lower magnetic conductive cover 31 together form the inner cavity 321. The air hole is provided on the lower center washer.

[0049] Preferably, the lower center magnetic structure 32 further includes a breathable spacer 6, which is disposed at the air hole and is a steel mesh, mesh cloth or other structural member with an air flow channel. In this embodiment, the breathable spacer 6 is connected to the lower center washer by gluing. In other embodiments, the breathable spacer 6 can also be connected to the lower center washer by other means.

[0050] In order to ensure that the middle sticker 11 has enough vibration space and improve the production consistency of the micro speaker, in this embodiment, a mounting groove 322 for mounting the breathable isolation member 6 is provided on the lower center washer, and the mounting groove 322 is arranged around the breathable hole.

[0051] In order to provide more adequate protection for the vibration component, optionally, an upper cover 211 is provided on the upper magnetic cover 21, the upper cover 211 is located at the end of the upper through hole, and the upper cover 211 is provided with a plurality of holes connected to the exhaust hole 23. The upper cover 211 and the upper magnetic cover 21 can be a split structure connected by welding, adhesive connection or other connection methods, or can be an integrated structure formed by integral processing.

[0052] In this embodiment, the micro speaker further includes an upper centering support 51, and the upper centering support 51 includes an upper inner fixing portion, an upper cantilever, and an upper outer fixing portion connected in sequence from the inside to the outside, and the upper diaphragm 14 is connected to the upper voice coil 12 through the upper inner fixing portion, and the upper annular magnetic conductive support 42 is connected to the upper diaphragm 14 through the upper outer fixing portion. In detail, the upper inner fixing portion is connected to the upper inner mounting portion and the upper voice coil 12, respectively, and the upper outer fixing portion is connected to the upper annular magnetic conductive support 42 and the upper outer mounting portion, respectively. The existence of the upper centering support 51 can correct the upper voice coil 12 and improve the polarization and rolling vibration of the upper voice coil 12.

[0053] Similarly, the micro speaker also includes a lower centering support 52, which includes a lower inner fixing portion, a lower cantilever, and a lower outer fixing portion connected in sequence from the inside to the outside, the lower diaphragm 15 is connected to the lower voice coil 13 through the lower inner fixing portion, and the lower annular magnetic conductive support 43 is connected to the lower diaphragm 15 through the lower outer fixing portion. In detail, the lower inner fixing portion is connected to the lower inner mounting portion and the lower voice coil 13, respectively, and the lower outer fixing portion is connected to the lower annular magnetic conductive support 43 and the lower outer mounting portion, respectively. The existence of the lower centering support 52 can correct the lower voice coil 13 and improve the polarization and rolling vibration of the lower voice coil 13.

[0054] The upper magnetic conductive cover 21 is provided with an upper avoidance groove 212 for avoiding the upper diaphragm 14 ; and / or the lower magnetic conductive cover 31 is provided with a lower avoidance groove 311 for avoiding the lower diaphragm 15 .

[0055] 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 vibration component, the vibration component includes a middle sticker, an upper voice coil, a lower voice coil, an upper diaphragm and a lower diaphragm, the upper diaphragm and the lower diaphragm are respectively ring-shaped, the upper voice coil and the lower voice coil are respectively connected to the middle sticker, the middle sticker is located between the upper voice coil and the lower voice coil, the upper voice coil is connected to the upper diaphragm, and the lower voice coil is connected to the lower diaphragm; An upper magnetic circuit component, the upper magnetic circuit component comprising an upper magnetic conductive cover and an upper central magnetic structure connected to each other, the upper magnetic conductive cover being connected to the upper diaphragm, and the upper magnetic circuit component having an exhaust hole penetrating the bottom surface of the upper central magnetic structure and the top surface of the upper magnetic conductive cover; A lower magnetic circuit component, the lower magnetic circuit component comprises a lower magnetic conductive cover and a lower central magnetic structure connected to each other, the lower magnetic conductive cover is connected to the lower diaphragm, the lower magnetic circuit component has an inner cavity, and a top surface of the lower magnetic circuit component is provided with an air hole connected to the inner cavity; Sound-absorbing particles, the sound-absorbing particles are arranged in the inner cavity; The external magnetic circuit component includes an annular external magnetic steel, an upper annular magnetic conductive bracket and a lower annular magnetic conductive bracket. The upper annular magnetic conductive bracket connects the annular external magnetic steel and the upper diaphragm, and the lower annular magnetic conductive bracket connects the annular external magnetic steel and the lower diaphragm.

2. The micro-speaker according to claim 1, characterized in that: The lower center magnetic structure includes a lower annular magnetic steel and a lower center washer. The bottom surface of the lower annular magnetic steel is connected to the lower magnetic conductive cover. The top surface of the lower annular magnetic steel is connected to the lower center washer. The lower annular magnetic steel, the lower center washer and the lower magnetic conductive cover together form the inner cavity. The air hole is arranged on the lower center washer.

3. The micro-speaker according to claim 2, characterized in that: The lower center magnetic structure also includes a breathable spacer, and the breathable spacer is arranged at the breathable hole.

4. The micro-speaker according to claim 3, characterized in that: The breathable isolation piece is a steel mesh or mesh cloth.

5. The micro-speaker according to claim 3, characterized in that: The lower center washer is provided with a mounting groove for mounting the breathable isolation member, and the mounting groove is arranged around the breathable hole.

6. The micro-speaker according to claim 1, characterized in that: An upper sealing cover is provided on the upper magnetic conductive cover, and the upper sealing cover is located at the end of the exhaust hole. The upper sealing cover is provided with a plurality of holes connected with the exhaust hole.

7. The micro-speaker according to claim 6, characterized in that: The upper magnetic conductive cover and the upper sealing cover are an integrated structure formed by integral processing.

8. The micro-speaker according to claim 1, characterized in that: It also includes an upper centering support plate, which includes an upper inner fixing portion, an upper cantilever and an upper outer fixing portion which are sequentially connected from the inside to the outside, the upper diaphragm is connected to the upper voice coil via the upper inner fixing portion, and the upper annular magnetic conductive bracket is connected to the upper diaphragm via the upper outer fixing portion.

9. The micro-speaker according to claim 1, characterized in that: It also includes a lower centering support plate, which includes a lower inner fixing portion, a lower cantilever and a lower outer fixing portion which are sequentially connected from the inside to the outside, the lower diaphragm is connected to the lower voice coil via the lower inner fixing portion, and the lower annular magnetic conductive bracket is connected to the lower diaphragm via the lower outer fixing portion.

10. The micro-speaker according to claim 1, characterized in that: The upper magnetic conductive cover is provided with an upper avoidance groove for avoiding the upper diaphragm; and / or, the lower magnetic conductive cover is provided with a lower avoidance groove for avoiding the lower diaphragm.

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