WO2022006977A1

WO2022006977A1 - Sound generation device

Info

Publication number: WO2022006977A1
Application number: PCT/CN2020/102626
Authority: WO
Inventors: 严绪东; 邵涛; 顾小江
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2020-07-06
Filing date: 2020-07-17
Publication date: 2022-01-13
Also published as: CN212785822U

Abstract

The present application relates to the field of electroacoustic conversion, and particularly relates to a sound generation device. In the sound generation device of the present application, a magnetic circuit system comprises a magnetic bowl fixed to a basket and a magnetic steel unit fixed to the magnetic bowl; the magnetic bowl comprises a magnetic bowl bottom wall for fixing the magnetic steel unit and a magnetic bowl side wall for surrounding the magnetic steel unit; the magnetic bowl side wall and the magnetic steel unit are spaced apart from each other and form a magnetic gap; the magnetic steel unit comprises a first magnetic steel, a pole core, and a second magnetic steel sequentially stacked on the magnetic bowl bottom wall in a vibration direction; the side of the magnetic bowl side wall distant from the magnetic bowl bottom wall and the side of the second magnetic steel distant from the pole core are at the same height with respect to the magnetic bowl bottom wall in the vibration direction. According to the mode, the height of the magnetic gap is increased, a voice coil is completely located in the magnetic gap, facilitating the increasing of a magnetic driving force, and magnetic fields along the entire height of the magnetic steel unit from bottom to top are utilized, thereby improving electromagnetic utilization efficiency of the magnetic circuit system, and facilitating improvement of acoustic performance of the sound generation device.

Description

a sound device

technical field

The present application relates to the field of electro-acoustic conversion, and in particular, to a sound-generating device.

Background technique

With the development of science and technology, more and more electronic devices have built-in sound-emitting devices. Generally, the sound-generating device will provide a uniform magnetic field through the magnetic steel, so that the voice coil passing the alternating current vibrates in the uniform magnetic field, and the voice coil drives the diaphragm to vibrate to make the sound-generating device generate sound.

The sound-generating device generally includes a basin frame, a vibration system fixed to the basin frame, and a magnetic circuit system system with a magnetic gap. The magnetic circuit system drives the vibration system to vibrate and sound. In the sound-generating device in the prior art, the magnetic circuit system The system generally uses the magnetic field at the bottom of the magnetic steel unit to cut the voice coil to generate Lorentz force for driving, while the magnetic field at the top of the magnetic steel unit is not used, and the electromagnetic utilization efficiency is low.

Therefore, it is necessary to provide a new sound-generating device to solve the above-mentioned technical problems.

technical problem

The purpose of this application is to provide a sound-emitting device to solve the technical problem of low electromagnetic utilization efficiency of the magnetic circuit system in the sound-emitting device in the prior art.

technical solutions

The technical solution of the present application is as follows: a sound-emitting device is provided, which includes a basin frame, a vibration system supported on the basin frame, and a magnetic circuit system for driving the vibration system to vibrate and emit sound, and the magnetic circuit system has a magnetic gap, so The vibration system includes a voice coil inserted in the magnetic gap, the magnetic circuit system includes a magnetic bowl fixed on the basin frame and a magnetic steel unit fixed on the magnetic bowl, the magnetic bowl includes a The bottom wall of the magnetic bowl for fixing the magnetic steel unit and the side wall of the magnetic bowl that is bent and extended from the edge of the bottom wall of the magnetic bowl to the direction away from the bottom wall of the magnetic bowl and arranged around the magnetic steel unit, the magnetic The side wall of the bowl is spaced from the magnetic steel unit to form the magnetic gap, and the magnetic steel unit includes a first magnetic steel, a pole core and a pole core that are sequentially stacked on the bottom wall of the magnetic bowl along the vibration direction of the vibration system. and a second magnetic steel, the height of the side of the side wall of the magnetic bowl away from the bottom wall of the magnetic bowl relative to the bottom wall of the magnetic bowl along the vibration direction is the same as the height of the second magnetic steel away from the pole core. The height of the side relative to the bottom wall of the magnetic bowl is the same along the vibration direction.

Preferably, the basin frame includes a bottom plate, an outer wall bent and extended from the outer peripheral edge of the bottom plate, and an inner wall bent and extended from the inner peripheral edge of the bottom plate, the outer walls are arranged around the inner wall and are spaced apart from each other, and the inner wall surrounds the inner wall. into a first accommodating space for accommodating the magnetic circuit system.

Preferably, the basin frame further includes a plurality of steps bent and extended into the first accommodating space from the side of the inner wall away from the bottom plate, and the magnetic bowl side wall is provided with a pass through it and is connected with the Fracture of step fit.

Preferably, the height of the side of the side wall of the magnetic bowl away from the bottom wall of the magnetic bowl relative to the bottom wall of the magnetic bowl in the vibration direction is greater than that of the side of the inner wall away from the bottom wall relative to the bottom of the magnetic bowl in the vibration direction The height of the wall, the fracture extends from the side of the magnetic bowl side wall away from the bottom wall of the magnetic bowl along the vibration direction, and the extension length of the fracture is smaller than the magnetic bowl side wall along the vibration direction Relative to the height of the bottom wall of the magnetic bowl, the step abuts against an end of the fracture close to the bottom wall of the magnetic bowl.

Preferably, the vibration system further includes a diaphragm covered on the basin frame and fixed on the side of the basin frame away from the bottom wall of the magnetic bowl, and a voice coil skeleton connecting the diaphragm and the voice coil , the voice coil skeleton includes a hollow barrel-shaped skeleton body and a reinforcing layer attached to the skeleton body, the voice coil is wound around the skeleton body, and the reinforcing layer is located on the voice coil between the diaphragm.

Preferably, the voice coil skeleton further includes a leakage hole penetrating both the reinforcing layer and the skeleton body.

Preferably, the vibration system further includes an auxiliary diaphragm fixed on the basin frame and spaced apart from the diaphragm, and a skeleton connecting the diaphragm and the auxiliary diaphragm, and the skeleton is located in the magnetic bowl The side wall is away from the side of the voice coil skeleton and surrounds the side wall of the magnetic bowl, and the skeleton is spaced from the side wall of the magnetic bowl.

Preferably, the skeleton includes an annular bottom plate opposite to the side wall of the magnetic bowl and a skeleton body fixed on the side of the annular bottom plate away from the bottom wall of the magnetic bowl, the annular bottom plate is connected to the auxiliary diaphragm, A side of the frame body away from the annular bottom plate is connected to the diaphragm.

Preferably, the diaphragm includes a dome connected to the voice coil skeleton and the skeleton at the same time, and a fold ring surrounding the dome and fixedly connected to the dome, the fold ring including a dome connected to the basin a first fixing part that is fixedly connected to the frame, a second fixing part that is fixedly connected to the dome, and a first folding ring part that connects the first fixing part and the second fixing part;

The auxiliary diaphragm includes a third fixing part fixedly connected to the basin frame, a fourth fixing part fixedly connected with the annular bottom plate, and a second folding part connecting the third fixing part and the fourth fixing part. Ring Department.

Preferably, the vibration system further includes a flexible circuit board fixedly connected to the skeleton body and electrically connected to the voice coil.

beneficial effect

The beneficial effect of the present application is that in the sound-emitting device of the present application, the magnetic circuit system includes a magnetic bowl fixed to the basin frame and a magnetic steel unit fixed to the magnetic bowl, and the magnetic bowl includes a The bottom wall of the magnetic bowl of the magnetic steel unit and the side wall of the magnetic bowl that is bent and extended from the edge of the bottom wall of the magnetic bowl to the direction away from the bottom wall of the magnetic bowl, the side wall of the magnetic bowl is spaced from the magnetic steel unit The magnetic gap is arranged and formed, and the magnetic steel unit includes a first magnetic steel, a pole core and a second magnetic steel stacked on the bottom wall of the magnetic bowl along the vibration direction of the vibration system. The side of the side wall away from the bottom wall of the magnetic bowl and the side of the second magnetic steel away from the pole core are at the same height relative to the bottom wall of the magnetic bowl along the vibration direction. By the above method, the magnetic gap is increased. Height, the voice coil is completely located in the magnetic gap, which is beneficial to increase the magnetic driving force. The magnetic field from the bottom to the top of the magnetic steel unit is used along the entire height direction, which improves the electromagnetic utilization efficiency of the magnetic circuit system and is conducive to improving sound production. the acoustic performance of the device.

Description of drawings

1 is a perspective view of a sound-emitting device of the application;

Fig. 2 is the A-A sectional view of the sounding device shown in Fig. 1;

3 is an exploded view of the structure of the sound-emitting device shown in FIG. 1;

Fig. 4 is the matching diagram of the magnetic bowl and the magnetic steel unit in the sound-emitting device of the application

Fig. 5 is the matching diagram of the magnetic circuit system and the front view of the basin frame in the sounding device of the application;

6 is an exploded view of the structure of the magnetic circuit system and the reverse side view of the basin frame in the sound-emitting device of the application;

FIG. 7 is a diagram of the cooperation of the voice coil and the voice coil skeleton in the sound-emitting device of the present application.

Embodiments of the present invention

In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the related drawings. The preferred embodiments of the present application are shown in the accompanying drawings. However, the application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that a thorough and complete understanding of the disclosure of this application is provided.

It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are for the purpose of describing specific embodiments only, and are not intended to limit the application.

Referring to FIGS. 1 to 6 , an embodiment of the present application provides a sound-generating device 100 , which includes a basin frame 1 , a vibration system 2 , and a magnetic circuit system 3 having a magnetic gap 30 . The vibration system 2 and the magnetic circuit system 3 are respectively supported on the basin frame 1 , and the magnetic circuit system 3 drives the vibration system 2 to vibrate and emit sound.

The basin frame 1 includes an annular bottom wall 11 , an outer wall 12 bent and extended from the outer periphery of the bottom wall 11 , and an inner wall 13 bent and extended from the inner periphery of the bottom wall 11 , and the outer wall 12 surrounds the The inner walls 13 are arranged and spaced apart from each other, and the inner walls 13 enclose a first accommodating space 101 for accommodating the magnetic circuit system 3 , and the first accommodating space 101 is a through cavity.

The magnetic circuit system 3 is fixed in the first accommodating space 101 . The magnetic circuit system 3 includes a magnetic bowl 31 fixed on the inner wall 13 and a magnetic steel unit 32 fixed on the magnetic bowl 31 . The magnetic bowl 31 includes The bottom wall 311 of the magnetic bowl and the side wall 312 of the magnetic bowl bent and extended from the edge of the bottom wall 311 to the direction away from the bottom wall 311 of the magnetic bowl, the bottom wall 311 of the magnetic bowl is used for fixing the magnetic steel unit 32 , the side wall 312 of the magnetic bowl and the magnetic steel unit 32 are spaced apart and form the magnetic gap 30 , and the magnetic steel unit 32 includes a plurality of components stacked on the bottom of the magnetic bowl along the vibration direction of the vibration system 2 in sequence. The first magnetic steel 321, the pole core 322 and the second magnetic steel 323 of the wall 311, the side of the magnetic bowl side wall 312 away from the magnetic bowl bottom wall 311 and the second magnetic steel 323 away from the pole core One side of 322 has the same height relative to the bottom wall 311 of the magnetic bowl along the vibration direction.

In an optional embodiment, please refer to FIG. 5 and FIG. 6 , the magnetic bowl 31 is fixed on the inner wall 13 through the magnetic bowl side wall 312 , the inner wall 13 is arranged around the magnetic bowl side wall 312 , and the inner wall 13 It also includes several steps 131 bent and extended from the side of the inner wall 13 away from the bottom plate 11 into the first accommodating space 101 , and the side of the magnetic bowl side wall 312 away from the bottom wall 311 of the magnetic bowl. The height relative to the bottom wall 311 of the magnetic bowl in the vibration direction is greater than the height of the side of the inner wall 13 away from the bottom plate 11 relative to the bottom wall 311 of the magnetic bowl along the vibration direction. The fracture 3121 matched with the step 131, the fracture 3121 extends from the side of the magnetic bowl side wall 312 away from the magnetic bowl bottom wall 311 along the vibration direction, and the extension length of the fracture 3121 is smaller than that of the magnetic bowl. The height of the side wall 312 of the bowl relative to the bottom wall 311 of the magnetic bowl along the vibration direction, the step 131 abuts the end of the fracture 3121 close to the bottom wall 311 of the magnetic bowl. Several steps 131 are arranged at intervals along the circumference of the inner wall 13 .

In this embodiment, please refer to FIG. 2 , FIG. 3 and FIG. 7 , the vibration system 2 includes a diaphragm 21 , a voice coil 22 , a voice coil frame 23 , an auxiliary diaphragm 24 and a frame 25 , and the diaphragm 21 is fixed on the basin On the side of the outer wall 12 of the frame 1 away from the bottom plate 11, the voice coil skeleton 23 is arranged between the voice coil 22 and the diaphragm 21 and is connected to both the voice coil 22 and the diaphragm 21, and one end of the auxiliary diaphragm 24 is fixed on the On the outer wall 12, the auxiliary diaphragm 24 is spaced apart from the diaphragm 21, the auxiliary diaphragm 24 is located between the diaphragm 21 and the bottom plate 11 in the vibration direction, and the other end of the auxiliary diaphragm 24 is fixed on the frame 25, and the frame 25 is used for The diaphragm 21 and the auxiliary diaphragm 24 are connected.

In this embodiment, all the voice coils 22 are located in the magnetic gap 30 , so as to generate an electromagnetic field with the magnetic circuit system 3 , to generate a magnetic driving force, and to drive the voice coil 22 and the voice coil 22 The directly connected voice coil bobbins 23 reciprocate together, so that the diaphragm 21 reciprocates and vibrates to produce sound. The magnetic steel unit 32 completely falls into the side wall 312 of the magnetic bowl along the projection perpendicular to the vibration direction, which increases the height of the magnetic gap 30 in the vibration direction. The magnetic field of the magnetic steel unit 32 is utilized along the entire height direction from the bottom to the top, which improves the electromagnetic utilization efficiency of the magnetic circuit system 3 and is beneficial to improve the acoustic performance of the sounding device 100 .

Further, the voice coil skeleton 23 includes a hollow barrel-shaped skeleton body 231 and a reinforcing layer 232 attached to the skeleton body 231. The voice coil 22 is directly wound on the skeleton body 231, The reinforcing layer 232 is located between the voice coil 22 and the diaphragm 21 . Further, the reinforcing layer 232 is arranged at intervals from the voice coil 22 . In this embodiment, the outer diameter of the reinforcing layer 232 is smaller than or equal to the outer diameter of the voice coil 22 . With the arrangement of the above structure, the skeleton body 231 is partially reinforced by the reinforcing layer 232, so that the skeleton body 231 is not easily deformed irreversibly, and the reliability of the sound-emitting device 100 is improved, that is, the skeleton body 231 is strengthened. The strength of the body 231 does not increase the outer diameter of the voice coil 22 , so as not to affect the width of the magnetic gap 30 , making the magnetic field of the magnetic circuit system 3 stronger, and further improving the acoustic performance of the sounding device 100 . In the voice coil bobbin 23, the bobbin body 231 is made of polyimide material, that is, made of tape. The reinforcing layer 232 is made of metal material, for example, the reinforcing layer 232 is made of aluminum paper. When the skeleton body 231 is made of this material, the resilience is good, the deformation recovery force is strong, and the thickness is small, which effectively saves the width space of the magnetic gap 30 . The reinforcing layer 232 made of aluminum paper is light and strong, which effectively improves the strength of the skeleton body 231 . The cross section of the skeleton body 231 is circular. The voice coil bobbin 23 further includes a leakage hole 233 penetrating both the reinforcing layer 232 and the bobbin body 231 .

The skeleton 25 is arranged around the magnetic bowl side wall 312 at intervals, and the projection of the skeleton 25 along the vertical vibration direction partially overlaps with the magnetic bowl side wall 312 and the voice coil skeleton 23 . The skeleton 25 includes an annular bottom plate 251 opposite to the side wall 312 of the magnetic bowl and a skeleton body 252 fixed on the side of the annular bottom plate 251 away from the bottom wall 311 of the magnetic bowl. The annular bottom plate 251 is connected to the The auxiliary diaphragm 24 is connected to the diaphragm 21 at the side of the frame body 252 away from the annular bottom plate 251 . Further, the vibration system 2 further includes a flexible circuit board 26 disposed on the frame body 252 , and the flexible circuit board 26 is electrically connected to the voice coil 22 .

Further, the diaphragm 21 includes a dome 211 connected to the voice coil skeleton 23 and the skeleton 25 at the same time, and a ring 212 surrounding the dome 211 and fixedly connected with the dome 211 . The fold ring 212 includes a first fixing portion 2121 fixedly connected to the side of the outer wall 12 away from the bottom plate 11 , a second fixing portion 2122 fixedly connected to the dome 211 , and connecting the first fixing portion 2121 to the other side. the first ring portion 2123 of the second fixing portion 2122; the auxiliary diaphragm 24 includes a third fixing portion 241 fixedly connected to the outer wall 12, a fourth fixing portion 242 fixedly connected to the annular bottom plate 251, and The second ring portion 243 of the third fixing portion 241 and the fourth fixing portion 242 is connected.

In this embodiment, the auxiliary diaphragm 24 is connected to the diaphragm 21 through the frame 25 , and vibrates back and forth together with the diaphragm 21 .

The above are only the embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, improvements can be made without departing from the creative concept of the present application, but these belong to the present application. scope of protection.

Claims

1. A sound-generating device, comprising a basin frame, a vibration system supported on the basin frame, and a magnetic circuit system for driving the vibration system to vibrate and sound, the magnetic circuit system having a magnetic gap, and the vibration system including a plug-in The voice coil in the magnetic gap is characterized in that the magnetic circuit system includes a magnetic bowl fixed on the basin frame and a magnetic steel unit fixed on the magnetic bowl, and the magnetic bowl includes a The bottom wall of the magnetic bowl of the magnetic steel unit and the side wall of the magnetic bowl that are bent and extended from the edge of the bottom wall of the magnetic bowl to the direction away from the bottom wall of the magnetic bowl and are arranged around the magnetic steel unit. The wall and the magnetic steel unit are spaced apart to form the magnetic gap, and the magnetic steel unit includes a first magnetic steel, a pole core and a second magnetic steel that are sequentially stacked on the bottom wall of the magnetic bowl along the vibration direction of the vibration system. Two magnetic steels, the height of the side wall of the magnetic bowl away from the bottom wall of the magnetic bowl is relative to the height of the bottom wall of the magnetic bowl along the vibration direction and the edge of the side of the second magnetic steel away from the pole core The height of the vibration direction relative to the bottom wall of the magnetic bowl is the same.

2. The sound-generating device according to claim 1, wherein the basin frame comprises a bottom plate, an outer wall bent and extended from the outer peripheral edge of the bottom plate, and an inner wall bent and extended from the inner peripheral edge of the bottom plate, the outer wall The inner wall is arranged around and spaced apart from each other, and the inner wall defines a first accommodating space for accommodating the magnetic circuit system.

3. The sound-generating device according to claim 2, wherein the basin frame further comprises a plurality of steps bent and extended into the first accommodating space from the side of the inner wall away from the bottom plate, the The side wall of the magnetic bowl is provided with a fracture passing through it and matched with the step.

4. The sound-generating device according to claim 3, characterized in that, the height of the side of the side wall of the magnetic bowl away from the bottom wall of the magnetic bowl relative to the bottom wall of the magnetic bowl along the vibration direction is greater than the height of the inner wall away from the bottom wall of the magnetic bowl. The height of one side of the bottom plate relative to the bottom wall of the magnetic bowl along the vibration direction, the fracture extends from the side of the side wall of the magnetic bowl away from the bottom wall of the magnetic bowl along the vibration direction, and the extension of the fracture The length is less than the height of the side wall of the magnetic bowl relative to the bottom wall of the magnetic bowl along the vibration direction, and the step is in contact with an end of the fracture close to the bottom wall of the magnetic bowl.

5. The sound-generating device according to claim 1, wherein the vibration system further comprises a vibrating membrane covering the basin frame and fixed to the side of the basin frame away from the bottom wall of the magnetic bowl, and a connection The diaphragm and the voice coil skeleton of the voice coil, the voice coil skeleton includes a hollow barrel-shaped skeleton body and a reinforcing layer attached to the skeleton body, and the voice coil is wound around the skeleton body. A skeleton body, the reinforcing layer is located between the voice coil and the diaphragm.

6. The sound-generating device according to claim 5, wherein the voice coil skeleton further comprises a leakage hole penetrating both the reinforcing layer and the skeleton body.

7. The sound-generating device according to claim 5, wherein the vibration system further comprises an auxiliary diaphragm fixed on the basin frame and spaced apart from the diaphragm, and an auxiliary diaphragm connected to the diaphragm and the auxiliary diaphragm. The skeleton of the diaphragm, the skeleton is located on the side of the magnetic bowl side wall away from the voice coil skeleton and surrounds the magnetic bowl side wall, and the skeleton is spaced from the magnetic bowl side wall.

8. The sound-generating device according to claim 7, wherein the frame comprises an annular base plate opposite to the side wall of the magnetic bowl and a frame body fixed to a side of the annular base plate away from the bottom wall of the magnetic bowl , the annular bottom plate is connected to the auxiliary diaphragm, and the side of the frame body away from the annular bottom plate is connected to the diaphragm.

9. The sound-generating device according to claim 8, wherein the diaphragm comprises a dome connected to the voice coil skeleton and the skeleton at the same time, and a dome surrounding the dome and fixedly connected to the dome The folding ring includes a first fixing part fixedly connected with the basin frame, a second fixing part fixedly connected with the dome, and a second fixing part connecting the first fixing part and the second fixing part the first folding ring part;

10. The sound-generating device according to claim 8, wherein the vibration system further comprises a flexible circuit board fixedly connected to the skeleton body and electrically connected to the voice coil.