CN219876077U

CN219876077U - Micro-speaker and speaker module

Info

Publication number: CN219876077U
Application number: CN202320570792.0U
Authority: CN
Inventors: 林嘉平; 董庆宾
Original assignee: Shenzhen Weishi Acoustics Co Ltd
Current assignee: Shenzhen Weishi Acoustics Co Ltd
Priority date: 2023-03-14
Filing date: 2023-03-14
Publication date: 2023-10-20
Anticipated expiration: 2033-03-14

Abstract

The utility model discloses a micro-speaker and a speaker module, wherein the micro-speaker comprises a sound membrane, an acoustic enhancement material, a ventilation isolation structure and a magnetic circuit assembly, the sound membrane comprises an inner fixing part, the inner fixing part is provided with an inner concave part, the acoustic enhancement material is filled in the inner concave part, the ventilation isolation structure is used for preventing the acoustic enhancement material from escaping from the inner concave part, the magnetic circuit assembly comprises a central washer, and the central washer is provided with a first avoidance groove for avoiding the inner concave part. The miniature loudspeaker is novel in structure, the concave part is arranged on the sound membrane, the height of the front sound cavity is increased, the increasingly long and narrow outline shape of the front sound cavity of the loudspeaker module is changed, the acoustic enhancement material enables reflected sound waves in the front sound cavity reflected by the side wall of the front sound cavity in the loudspeaker module to be absorbed and weakened under the action of the acoustic enhancement material, the standing wave of the front sound cavity is reduced, the frequency response curve of the loudspeaker module is improved, and the sounding tone quality of the loudspeaker module is improved.

Description

Micro-speaker and speaker module

Technical Field

The utility model relates to the technical field of electroacoustic transducers, in particular to a miniature loudspeaker and a loudspeaker module.

Background

Micro-speakers serve as a common electroacoustic transducer device for converting electrical energy into acoustic energy, which plays an indispensable role in sound emission systems.

With consumer electronic products such as mobile phones and tablet personal computers, especially large-sized wearable electronic devices such as AR/VR, higher requirements are put forward on the appearance, the thinness and the performance, and as an important component unit of such products, the micro-speaker also puts forward higher and higher requirements on the performance, the size and the like.

The overall dimension of the traditional miniature loudspeaker is flattened more and more to meet the overall thinner dimension requirement of the loudspeaker module, but the front acoustic cavity of the loudspeaker module is long and narrow, the front acoustic cavity standing wave is easy to generate, the frequency response curve of the loudspeaker module generates a wave crest and wave trough structure with larger drop at some frequency bands, and the sound production tone quality is influenced.

In the prior art, a part of speaker modules are provided with an acoustic enhancement material in the rear acoustic cavity to absorb sound so as to improve the acoustic performance of the speaker modules.

Disclosure of Invention

The utility model mainly aims to provide a miniature loudspeaker with a novel structure, and aims to solve the problem that the sound quality is affected by standing waves of a front acoustic cavity of an existing loudspeaker module.

In order to solve the technical problems, the first technical scheme adopted by the utility model is as follows: a micro-speaker, comprising:

a sound membrane including an inner fixing portion having an inner concave portion recessed toward an inside near the micro speaker;

an acoustic reinforcement material having a porous structure, the acoustic reinforcement material being filled in the concave portion;

the ventilation isolation structure is arranged on the inner fixing part and used for preventing the acoustic enhancement material from escaping from the concave part;

the magnetic circuit assembly comprises a central washer, and the central washer is provided with a first avoidance groove for avoiding the concave part.

Further, the breathable isolation device also comprises a middle patch, wherein the middle patch is provided with ventilation holes, and the ventilation isolation structure is formed in the region where the ventilation holes are formed in the middle patch.

Further, the breathable isolation structure further comprises a middle patch, a through hole is formed in the middle patch, and the breathable isolation structure is arranged corresponding to the through hole.

Further, the concave portion is located in a central region of the inner fixing portion.

Further, the first avoiding groove is communicated with the bottom surface of the central washer, the magnetic circuit assembly further comprises a central magnetic steel arranged on the bottom surface of the central washer, and the central magnetic steel is provided with a second avoiding groove for avoiding the concave part.

Further, the second avoidance groove is not communicated with the bottom surface of the central magnetic steel.

Further, the second avoiding groove is communicated with the bottom surface of the central magnetic steel.

Further, the magnetic circuit assembly further comprises a yoke arranged on the bottom surface of the central magnetic steel, and the yoke is provided with a third avoiding groove for avoiding the concave part.

Further, the third avoiding groove is not communicated with the bottom surface of the yoke; or, the third avoiding groove is communicated with the bottom surface of the yoke.

In order to solve the technical problems, the second technical scheme adopted by the utility model is as follows: the loudspeaker module comprises the micro loudspeaker.

The utility model has the beneficial effects that: the miniature loudspeaker is novel in structure, the concave part is arranged on the sound membrane, the height of the front sound cavity is increased, the increasingly long and narrow outline shape of the front sound cavity of the loudspeaker module is changed, meanwhile, the acoustic enhancement material is filled in the concave part, so that reflected sound waves in the front sound cavity reflected by the side wall of the front sound cavity in the loudspeaker module are absorbed and weakened under the action of the acoustic enhancement material, the degree of mutual interference between the reflected sound waves and incident sound waves is reduced, standing waves of the front sound cavity are reduced, the frequency response curve of the loudspeaker module is improved, and the sounding tone quality of the loudspeaker module is improved. The arrangement of the avoidance groove on the magnetic circuit assembly can provide space for the movement of the inner concave part, so that the thickness increase of the micro-speaker caused by the existence of the inner concave part is avoided, and the micro-speaker can be kept miniaturized.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a cross-sectional view of a micro-speaker according to a first embodiment of the present utility model;

fig. 2 is a cross-sectional view of a speaker module according to a first embodiment of the present utility model;

fig. 3 is a cross-sectional view of a micro-speaker according to a second embodiment of the present utility model;

fig. 4 is a cross-sectional view of a micro-speaker according to another embodiment of the present utility model;

fig. 5 is a cross-sectional view of a micro speaker according to a third embodiment of the present utility model;

fig. 6 is a cross-sectional view of a micro speaker according to another embodiment of the present utility model;

fig. 7 is a cross-sectional view of a micro-speaker according to a fourth embodiment of the present utility model;

fig. 8 is a cross-sectional view of a speaker module according to a fourth embodiment of the present utility model.

Reference numerals illustrate:

1. a basin stand;

2. an acoustic enhancement material;

3. a ventilation isolation structure;

4. a sound membrane; 41. an inner fixing part; 42. a ring folding part; 43. an outer fixing part; 44. an inner concave portion;

5. middle paste; 51. ventilation holes; 52. a through hole;

71. a yoke; 711. a third avoidance groove; 72. a center magnetic steel; 721. a second avoidance groove; 73. a central washer; 731. a first avoidance groove;

8. a module housing; 81. a front acoustic cavity; 82. a posterior acoustic cavity.

Detailed Description

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, in the embodiment of the present utility model, directional indications such as up, down, left, right, front, and rear … … are referred to, and the directional indication is merely used to explain the relative positional relationship, movement conditions, and the like between the components in a specific posture such as that shown in the drawings, and if the specific posture is changed, the directional indication is changed accordingly.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.

In addition, if the meaning of "and/or" is presented throughout this document to include three parallel schemes, taking "and/or" as an example, including a scheme, or a scheme that is satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Example 1

Referring to fig. 1 and 2, a first embodiment of the utility model is as follows: the micro speaker can be applied to portable electronic equipment such as mobile phones, hearing aids, tablet computers and the like and wearable electronic equipment such as AR/VR and the like.

The miniature loudspeaker comprises a basin frame 1, an acoustic enhancement material 2, a ventilation isolation structure 3, and a vibration component and a magnetic circuit component which are respectively arranged on the basin frame 1, wherein the vibration component comprises a vibrating diaphragm component and a voice coil, the voice coil is arranged on the vibrating diaphragm component, in the embodiment, the vibrating diaphragm component comprises a sound membrane 4 and a middle patch 5 fixed on the sound membrane 4, and in other embodiments, the vibrating diaphragm component can only comprise the sound membrane 4 without arranging the middle patch 5; the magnetic circuit assembly comprises a yoke 71, a central magnetic steel 72, side magnetic steels, a central washer 73 and Bian Huasi, wherein the central magnetic steel 72 and the side magnetic steels are respectively arranged on the yoke 71, the central magnetic steel 72 is positioned between at least one group of two side magnetic steels which are oppositely arranged, a magnetic gap for the voice coil to move is formed between the central magnetic steel 72 and the side magnetic steels, bian Huasi is arranged on one side, away from the yoke 71, of the side magnetic steel, the central washer 73 is arranged on one side, away from the yoke 71, of the central magnetic steel 72, namely, the central washer 73 is arranged on the top surface of the central magnetic steel 72, and the yoke 71 is arranged on the bottom surface of the central washer 73. In some embodiments, a flange may be formed on the yoke 71 instead of the side magnetic steel, in which case the provision of Bian Huasi is not required.

The sound membrane 4 comprises an inner fixing part 41, a folded ring part 42 and an outer fixing part 43 which are sequentially connected from inside to outside, the outer fixing part 43 is connected with the basin frame 1, and the inner fixing part 41 is provided with an inner concave part 44 which is concave towards the inner part close to the miniature loudspeaker; the acoustic enhancement material 2 is of a porous structure, and the acoustic enhancement material 2 is filled in the concave part 44; the inner fixing portion 41 is further provided with a ventilation isolation structure 3, and the ventilation isolation structure 3 is used for preventing the acoustic enhancement material 2 from escaping from the concave portion 44.

In this embodiment, the voice coil is connected to the bottom surface of the sound membrane 4, the middle paste 5 is disposed on the top surface of the sound membrane 4, the middle paste 5 is provided with ventilation holes 51, the region where the ventilation holes 51 are disposed in the middle paste 5 forms the ventilation isolation structure 3, and preferably, the number of ventilation holes 51 is multiple. The ventilation holes 51 are formed in the local area of the middle patch 5 to form the ventilation isolation structure 3, so that the miniature loudspeaker does not need to be additionally provided with parts, the assembly process of the miniature loudspeaker is simplified, the assembly efficiency of the miniature loudspeaker is improved, and the production benefit is improved.

Optionally, the acoustic enhancement material 2 is a sound absorbing particle, the particle size of the sound absorbing particle is smaller than the pore diameter of the air vent 51, and the sound absorbing particle is selected from zeolite, activated carbon, and the like. In other embodiments, the acoustic reinforcement material 2 may also be sound absorbing cotton or the like.

To avoid noise generated by the concave portion 44 touching the magnetic circuit assembly during vibration of the vibration assembly, the central washer 73 has a first escape groove 731 for escaping from the concave portion 44.

It is possible that the first avoiding groove 731 is not in communication with the bottom surface of the central washer 73, or that the first avoiding groove 731 is in communication with the bottom surface of the central washer 73, and when the first avoiding groove 731 is in communication with the bottom surface of the central washer 73, the height of the concave portion 44 may be set higher, so that the hollow area of the concave portion 44 is larger in volume, and further more acoustic reinforcement material 2 is accommodated.

Preferably, the concave portion 44 is located in a central region of the inner fixing portion 41. The concave portion 44 is located in the middle area of the inner fixing portion 41, so that the first avoiding groove 731 is also located in the middle area of the magnetic circuit assembly, and in the flattened micro-speaker, the magnetic force utilization efficiency of the middle area of the magnetic circuit assembly is low, so that the influence of the concave portion 44 located in the middle area of the sound membrane 4 on the magnetic field of the magnetic circuit assembly is small.

The embodiment also provides a speaker module, the speaker module includes module shell 8 and locates sound production device in the module shell 8, sound production device will the inner chamber of module shell 8 is separated into preceding sound cavity 81 and back sound cavity 82, be equipped with the intercommunication on the module shell 8 the sound outlet of preceding sound cavity 81, sound production device is above-mentioned miniature speaker, the cavity region intercommunication of indent 44 preceding sound cavity 81.

Example two

Referring to fig. 3 and 4, a second embodiment of the present utility model is a parallel technical solution of the first embodiment, and is different from the first embodiment in that: the center magnetic steel 72 has a second escape groove 721 for escaping from the concave portion 44, and the second escape groove 721 communicates with the first escape groove 731.

As shown in fig. 3, it is possible that the second avoidance groove 721 does not communicate with the bottom surface of the center magnetic steel 72; as shown in fig. 4, it is also possible that the second escape groove 721 communicates with the bottom surface of the center magnetic steel 72.

The embodiment also provides a loudspeaker module with the micro loudspeaker.

Example III

Referring to fig. 5 and 6, a third embodiment of the present utility model is a parallel technical solution of the first embodiment, and is different from the first embodiment in that: the central magnetic steel 72 is provided with a second avoidance groove 721 for avoiding the concave part 44, and the second avoidance groove 721 is communicated with the bottom surface of the central magnetic steel 72; the yoke 71 has a third escape groove 711 for escaping from the concave portion 44, and the third escape groove 711 communicates with the second escape groove 721.

As shown in fig. 5, it is possible that the third avoidance groove 711 does not communicate with the bottom surface of the yoke 71; as shown in fig. 6, the third escape groove 711 may communicate with the bottom surface of the yoke 71.

The embodiment also provides a loudspeaker module with the micro loudspeaker.

Example IV

Referring to fig. 7 and 8, a fourth embodiment of the present utility model is a parallel solution of the first embodiment, and is different from the first embodiment in that: as shown in fig. 7, the air-permeable separation structure 3 is a separate structure from the middle patch 5, in this embodiment, the middle patch 5 has a through hole 52 corresponding to the concave portion 44, and the air-permeable separation structure 3 is fixed to the sound membrane 4 and at least a part of the area is located in the through hole 52, that is, the air-permeable separation structure 3 is disposed corresponding to the through hole 52.

The ventilation isolation structure 3 can be a net-shaped structural member such as a mesh cloth or a porous structural member such as a sponge.

As shown in fig. 8, the present embodiment further provides a speaker module with the micro-speaker.

In the micro-speaker of the present embodiment, the second avoidance groove and/or the third avoidance groove may be provided in the magnetic circuit assembly, as in the second and third embodiments.

The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all the equivalent structural changes made by the description of the present utility model and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims

1. Miniature speaker, its characterized in that: comprising

2. A micro-speaker as claimed in claim 1, wherein: the breathable isolation structure is characterized by further comprising a middle patch, wherein the middle patch is provided with ventilation holes, and the ventilation isolation structure is formed in the region where the ventilation holes are formed in the middle patch.

3. A micro-speaker as claimed in claim 1, wherein: the breathable isolation structure is characterized by further comprising a middle patch, wherein a through hole is formed in the middle patch, and the breathable isolation structure is arranged corresponding to the through hole.

4. A micro-speaker as claimed in claim 1, wherein: the concave portion is located in a central region of the inner fixing portion.

5. A micro-speaker as claimed in claim 1, wherein: the first avoiding groove is communicated with the bottom surface of the central washer, the magnetic circuit assembly further comprises a central magnetic steel arranged on the bottom surface of the central washer, and the central magnetic steel is provided with a second avoiding groove for avoiding the concave part.

6. A micro-speaker as claimed in claim 5, wherein: the second avoiding groove is not communicated with the bottom surface of the central magnetic steel.

7. A micro-speaker as claimed in claim 5, wherein: the second avoiding groove is communicated with the bottom surface of the central magnetic steel.

8. A micro-speaker as claimed in claim 7, wherein: the magnetic circuit assembly further comprises a yoke iron arranged on the bottom surface of the central magnetic steel, and the yoke iron is provided with a third avoiding groove for avoiding the concave part.

9. A micro-speaker as claimed in claim 8, wherein: the third avoiding groove is not communicated with the bottom surface of the yoke; or, the third avoiding groove is communicated with the bottom surface of the yoke.

10. Speaker module, its characterized in that: comprising a micro-speaker according to any of claims 1-9.