CN219068351U

CN219068351U - Miniature loudspeaker

Info

Publication number: CN219068351U
Application number: CN202220265506.5U
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: 2022-02-08
Filing date: 2022-02-08
Publication date: 2023-05-23
Anticipated expiration: 2032-02-08

Abstract

The utility model relates to the technical field of acoustic devices, in particular to a miniature loudspeaker, which comprises a basin frame, a voice coil and a framework, wherein the voice coil and the framework are arranged in the basin frame in a stacked mode, an auxiliary membrane is arranged on the inner side wall of the basin frame, an auxiliary membrane inner fixing part and an arc-shaped folded ring part which are connected with each other are arranged on the auxiliary membrane, a framework straight edge is arranged on the framework, and the framework straight edge is adhered to the auxiliary membrane inner fixing part. The auxiliary membrane provides deformation amount for vibration through setting up to be curved book ring portion, and the arc structure of book ring portion can also reduce the area that auxiliary membrane occupy between basin frame and voice coil loudspeaker voice coil under the deformation amount requirement that improves vibration system, guarantees to have sufficient space between skeleton and the auxiliary membrane and is used for improving the magnetic gap of voice coil loudspeaker voice coil, improves BL curve flatness and vibration system vibration's symmetry, reduces harmonic distortion.

Description

Miniature loudspeaker

Technical Field

The utility model relates to the technical field of acoustic devices, in particular to a micro loudspeaker.

Background

As a device capable of converting electric energy into acoustic energy, a micro speaker has been widely used in microelectronic devices such as smart phones, camcorders, cameras, and notebook computers. As microelectronic devices become thinner and lighter and have higher requirements for sound quality and loudness, the height requirements for micro-speakers have also become thinner and the amplitude requirements have also become greater. In the prior art, the auxiliary film is added to inhibit the polarization of the voice coil, so that the amplitude is improved. However, the amplitude of the vibration needs to be increased further to the width of the auxiliary film fixed on the voice coil, which can occupy the straight edge position of the edge magnetic steel or the magnetic cover, and thus a complete magnetic circuit cannot be formed, resulting in reduced performance sensitivity.

Disclosure of Invention

In order to overcome the above-mentioned drawbacks of the prior art, the present utility model is to provide a micro-speaker capable of improving the magnetic gap of the voice coil.

In order to solve the technical problems, the utility model adopts the following technical scheme: the utility model provides a miniature loudspeaker, is in including basin frame and range upon range of setting voice coil loudspeaker voice coil and skeleton in the basin frame, be equipped with vice membrane on the inside wall of basin frame, be equipped with interconnect's vice membrane internal fixation portion and be curved book ring portion on the vice membrane, be equipped with the skeleton straight flange on the skeleton, the skeleton straight flange with vice membrane internal fixation portion adheres mutually.

Further, one end of the straight edge of the framework far away from the framework is provided with an outer framework fixing part, and the outer framework fixing part is adhered with the inner auxiliary film fixing part.

Further, the straight edge of the framework is perpendicular to the outer fixing part of the framework.

Further, the framework outer fixing part extends from the free end of the framework straight edge towards the inner side wall of the basin frame.

Further, the framework outer fixing part extends from the free end of the framework straight edge towards the voice coil.

Furthermore, a gap is formed between the voice coil and the straight edge of the framework, and outer magnetic steel and outer washer which are arranged in a stacked mode are arranged in the basin frame and are located in the gap.

Furthermore, the outer magnetic steel is not contacted with the straight edge of the framework and the voice coil, and the outer washer is not contacted with the straight edge of the framework.

Furthermore, a gap is formed between the voice coil and the straight edge of the framework, a magnetic shield is arranged in the basin frame, the magnetic shield is provided with the straight edge of the magnetic shield, and the straight edge of the magnetic shield is positioned in the gap.

Furthermore, the straight edge of the magnetic shield is not contacted with the straight edge of the voice coil and the straight edge of the framework.

The utility model has the beneficial effects that: the utility model provides a miniature loudspeaker, through setting up the straight flange of skeleton and gluing with vice membrane internal fixation portion mutually to can reduce the voice coil loudspeaker voice coil volume, improve the clearance between voice coil loudspeaker voice coil and the vice membrane. Meanwhile, the auxiliary membrane provides deformation amount for vibration through the arc-shaped folded ring part, the arc-shaped structure of the folded ring part can also reduce the occupied area of the auxiliary membrane between the basin frame and the voice coil under the requirement of improving the deformation amount required by the vibration system, the sufficient space between the framework and the auxiliary membrane is ensured to be used for improving the magnetic gap of the voice coil, the flatness of BL curves is improved, the vibration symmetry of the vibration system is improved, and the harmonic distortion is reduced.

Drawings

FIG. 1 is an exploded view of a micro-speaker according to the present utility model;

fig. 2 is a schematic structural diagram of a sub-membrane of a micro-speaker according to the present utility model;

fig. 3 is a top view of a micro-speaker according to the present utility model;

fig. 4 is a bottom view of a micro-speaker according to the present utility model;

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

FIG. 6 is an enlarged view of a portion of FIG. 5;

fig. 7 is a partial enlarged view of a first embodiment of a micro-speaker according to the present utility model;

fig. 8 is a partial enlarged view of a second embodiment of a micro-speaker according to the present utility model;

fig. 9 is a partial enlarged view of a third embodiment of a micro-speaker according to the present utility model;

description of the reference numerals:

1. a basin stand; 2. a dome; 3. a vibrating diaphragm; 4. a skeleton; 41. straight edges of the framework; 42. a skeleton outer fixing part; 5. a voice coil; 6. a magnetic circuit assembly; 61. a magnetic shield; 62. a center magnetic steel; 63. a central washer; 64. an outer magnetic steel; 65. an exo-washer; 611. straight edges of the magnetic shield; 7. a secondary membrane; 71. an auxiliary membrane internal fixing part; 72. a ring folding part; 73. and an outer fixing part of the auxiliary membrane.

Detailed Description

In order to describe the technical contents, the achieved objects and effects of the present utility model in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.

Referring to fig. 1 to 9, the micro-speaker provided by the utility model comprises a frame, a voice coil and a skeleton, wherein the voice coil and the skeleton are stacked in the frame, an auxiliary film is arranged on the inner side wall of the frame, an auxiliary film inner fixing part and an arc-shaped ring folding part which are connected with each other are arranged on the auxiliary film, a skeleton straight edge is arranged on the skeleton, and the skeleton straight edge is adhered to the auxiliary film inner fixing part.

From the above description, the beneficial effects of the utility model are as follows: the utility model provides a miniature loudspeaker, through setting up the straight flange of skeleton and gluing with vice membrane internal fixation portion mutually to can reduce the voice coil loudspeaker voice coil volume, improve the clearance between voice coil loudspeaker voice coil and the vice membrane. Meanwhile, the auxiliary membrane provides deformation amount for vibration through the arc-shaped folded ring part, the arc-shaped structure of the folded ring part can also reduce the occupied area of the auxiliary membrane between the basin frame and the voice coil under the requirement of improving the deformation amount required by the vibration system, the sufficient space between the framework and the auxiliary membrane is ensured to be used for improving the magnetic gap of the voice coil, the flatness of BL curves is improved, the vibration symmetry of the vibration system is improved, and the harmonic distortion is reduced.

From the above description, the straight edge of the framework is adhered to the inner fixing part of the auxiliary film by arranging the outer fixing part of the framework, so that the adhesion area between the framework and the inner fixing part of the auxiliary film can be effectively increased, the adhesion force between the framework and the auxiliary film is increased, and the fixing strength is enhanced.

From the above description, the straight edge of the framework is perpendicular to the outer fixing part of the framework, so that the strength of the framework can be increased, and the risk of cracking and separating at the bottom of the straight edge of the framework is reduced. Further, the framework outer fixing part extends from the free end of the framework straight edge towards the inner side wall of the basin frame.

From the above description, a gap is formed between the voice coil and the straight edge of the framework, and an integral magnetic loop can be formed by arranging the outer magnetic steel and the outer washer in the gap, so that the performance sensitivity is prevented from being reduced.

From the above description, the outer magnetic steel and the outer washer are not contacted with the straight edge of the framework, so that the voice coil can be prevented from rubbing with the outer magnetic steel and the outer washer in the vibration process, and noise of the loudspeaker is prevented. Meanwhile, the external magnetic steel and the external washer are harder in texture, so that the voice coil is damaged and disconnected from the electric connection end due to friction between the voice coil and the external magnetic steel and between the voice coil and the external washer.

From the above description, it is known that a gap is formed between the voice coil and the straight edge of the frame, and by providing the straight edge of the magnetic shield on the magnetic shield and positioning the straight edge of the magnetic shield in the gap, a complete magnetic circuit can be formed, and the performance sensitivity is prevented from being reduced.

From the above description, the magnetic shield straight edge is not contacted with the voice coil and the framework straight edge, so that the voice coil can be prevented from rubbing the magnetic shield straight edge in the vibration process, and noise of the loudspeaker is prevented. Meanwhile, as the straight edge of the magnetic shield is harder, friction between the voice coil and the straight edge of the magnetic shield can damage the voice coil and disconnect the voice coil from the electric connection end.

Application scenario

A micro-speaker is provided, which is widely used in microelectronic devices such as smart phones, camcorders, cameras, notebook computers, and the like.

Referring to fig. 1 to 7, a first embodiment of the present utility model is as follows: the miniature loudspeaker comprises a basin frame 1, and a dome 2, a vibrating diaphragm 3, a framework 4, a voice coil 5 and a magnetic circuit assembly 6 which are sequentially stacked in the basin frame from top to bottom. The opposite sides of the voice coil are respectively provided with an auxiliary membrane 7, the auxiliary membrane comprises an auxiliary membrane inner fixing part 71, a folded ring part 72 and an auxiliary membrane outer fixing part 73 which are sequentially connected with each other, and the auxiliary membrane outer fixing part is connected with the inner side wall of the basin frame. The framework is provided with a framework straight edge 41 which is vertically extended downwards relative to the framework, and the framework straight edge is adhered to the inner fixing part of the auxiliary membrane. The ring folding part of the auxiliary film is arc-shaped, and the arc-shaped concave surface corresponding to the ring folding part is upwards arranged.

In this embodiment, one end of the frame straight edge far away from the frame is provided with a frame external fixing portion 42, specifically, the frame straight edge is perpendicular to the frame external fixing portion, and the frame external fixing portion extends from the free end of the frame straight edge toward the voice coil.

In this embodiment, the magnetic circuit assembly includes a magnetic cover 61, and a central magnetic steel 62 and a central washer 63 that are sequentially stacked from bottom to top and disposed at the central position of the magnetic cover. The voice coil is matched with the central magnetic steel and the central washer in size, and the voice coil is arranged concentrically with the central magnetic steel and the central washer. A gap is formed between the voice coil and the framework straight edge, the magnetic shield straight edge 611 which is arranged in a vertically upward extending mode is arranged at the edge of the magnetic shield, the magnetic shield straight edge is positioned in the gap, and the magnetic shield straight edge is not in contact with the voice coil and the framework straight edge.

In this embodiment, the skeleton principle is that one end of the straight edge of the skeleton is a frame with a shape of a circle, and the vibrating diaphragm is bonded with the frame of the skeleton.

Referring to fig. 8, a second embodiment of the present utility model is as follows:

the first difference from the above embodiment is that the structure of the magnetic circuit assembly is further improved, specifically:

the magnetic circuit assembly further comprises an outer magnetic steel 64 and an outer washer 65 which are arranged around the periphery of the central magnetic steel and the central washer in a surrounding mode, the outer magnetic steel and the outer washer are arranged at the edge position of the magnetic cover in a stacked mode, and the outer magnetic steel and the outer washer are located in the gap.

Referring to fig. 9, a third embodiment of the present utility model is as follows:

the difference from the first embodiment is that the structure of the straight edge of the skeleton is further improved, specifically:

the frame straight edge is far away from one end of the frame and is provided with a frame outer fixing part, and specifically, the frame straight edge is perpendicular to the frame outer fixing part, and the frame outer fixing part extends from the free end of the frame straight edge towards the inner side wall of the basin frame.

Working principle:

during operation, the magnetic circuit assembly is electrified to form a complete magnetic loop, the voice coil moves between the magnetic gap formed by the vibrating diaphragm and the framework and drives the vibrating diaphragm and the auxiliary diaphragm on the framework bonding part to deform, and the ring folding part of the auxiliary diaphragm provides deformation for the vibration in the up-down direction, so that the Z-axis position of the voice coil in the magnetic gap can be adjusted, the BL curve flatness of the micro-speaker and the symmetry of vibration of the vibration system are improved, and the harmonic distortion is reduced.

In summary, according to the micro-speaker provided by the utility model, the straight edge of the framework is adhered to the inner fixing part of the auxiliary membrane, so that the volume of the voice coil can be reduced, and the gap between the voice coil and the auxiliary membrane can be increased. Meanwhile, the auxiliary membrane provides deformation amount for vibration through the arc-shaped folded ring part, the arc-shaped structure of the folded ring part can also reduce the occupied area of the auxiliary membrane between the basin frame and the voice coil under the requirement of improving the deformation amount required by the vibration system, the sufficient space between the framework and the auxiliary membrane is ensured to be used for improving the magnetic gap of the voice coil, the flatness of BL curves is improved, the vibration symmetry of the vibration system is improved, and the harmonic distortion is reduced.

The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent changes made by the specification and drawings of the present utility model, or direct or indirect application in the relevant art, are included in the scope of the present utility model.

Claims

1. The utility model provides a miniature loudspeaker, includes basin frame and range upon range of setting voice coil loudspeaker voice coil and the skeleton in the basin frame, be equipped with vice membrane on the inside wall of basin frame, its characterized in that, be equipped with interconnect's vice membrane internal fixation portion and be curved book ring portion on the vice membrane, be equipped with the skeleton straight flange on the skeleton, the skeleton straight flange with vice membrane internal fixation portion bonds mutually.

2. The micro-speaker of claim 1, wherein the end of the straight edge of the frame away from the frame has an outer frame fixing portion, and the outer frame fixing portion is adhered to the inner sub-membrane fixing portion.

3. A micro-speaker according to claim 2, wherein the straight edge of the frame is perpendicular to the outer fixing portion of the frame.

4. A micro-speaker according to claim 3, wherein the frame outer fixing portion extends from a free end of the frame straight edge toward the inner side wall of the basin frame.

5. A micro-speaker according to claim 3, wherein the frame outer fixing portion is provided extending from a free end of the frame straight edge toward the voice coil.

6. The miniature loudspeaker of claim 1, wherein a gap is provided between the voice coil and the straight edge of the frame, and an outer magnet steel and an outer washer are arranged in the frame in a stacked manner, and are both positioned in the gap.

7. The micro-speaker of claim 6, wherein none of the outer magnet steels is in contact with the straight edge of the frame and none of the outer washer is in contact with the straight edge of the frame.

8. The miniature loudspeaker of claim 1, wherein a gap is provided between said voice coil and said frame straight edge, a magnetic shield is disposed in said frame, said magnetic shield is provided with a magnetic shield straight edge, and said magnetic shield straight edge is disposed in said gap.

9. The miniature loudspeaker of claim 8, wherein none of said magnetic shield straight edges is in contact with said voice coil and said frame straight edge.