WO2022110458A1

WO2022110458A1 - Sound production device

Info

Publication number: WO2022110458A1
Application number: PCT/CN2020/140070
Authority: WO
Inventors: 金鑫; 张帆; 钟志威
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声光电科技(常州)有限公司
Priority date: 2020-11-30
Filing date: 2020-12-28
Publication date: 2022-06-02
Also published as: CN112312247A

Abstract

Provided is a sound production device. The sound production device comprises a cone frame, a vibrating system and a magnetic circuit system having a magnetic gap, which are respectively fixed to the cone frame, and a front cover, wherein the vibrating system comprises a vibrating diaphragm and a voice coil, which is inserted into the magnetic gap to drive the vibrating diaphragm to vibrate for sound production; the cone frame comprises an upper surface facing the front cover, a lower surface arranged opposite the upper surface, and an inner surface and an outer surface, which connect the upper surface to the lower surface; the inner surface is closer to the voice coil than the outer surface; the front cover comprises a cover body and a flange, which is formed in such a manner that same is bent and extends from the outer periphery of the cover body in the direction of the lower surface; the vibrating diaphragm and the cone frame are integrally formed; the vibrating diaphragm has an edge portion, which is sandwiched between the upper surface and the cover body and is bonded to the cover body, and a cladding portion, which is formed in such a manner that same is bent and extends from the outer periphery of the edge portion in the direction of the lower surface, and which is fixed to the outer surface; and the flange is bonded and fixed to the cladding portion. The sound production device provided in the present invention can achieve a higher degree of waterproofing.

Description

sound device

technical field

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

Background technique

In order to adapt to the miniaturization and multi-function development of various audio equipment and information communication equipment, it is required that the sound-emitting devices used in such equipment tend to be more miniaturized, so that the cooperation between the sound-emitting device and other surrounding components is more compact. In particular, with the development of thin and light mobile phones, the quality requirements for the sound-emitting devices used in them are getting higher and higher.

In the related art, the sound-generating device includes a basin frame, a vibration system respectively fixed to the basin frame, a magnetic circuit system with a magnetic gap, and a front cover, and the vibration system includes a diaphragm sandwiched between the basin frame and the front cover, and a magnetic gap inserted It is a voice coil that drives the diaphragm to vibrate and produce sound. The front cover is fixed on the side of the diaphragm away from the basin frame (that is, the diaphragm is sandwiched between the basin frame and the front cover) and is enclosed with the diaphragm to form a sound cavity. The upper part is provided with a sound outlet which communicates with the sound cavity. However, due to the limited gluing area between the diaphragm, the basin frame and the front cover, the sound-generating device cannot reach a higher waterproof level.

Therefore, it is necessary to provide a new sounding device to solve the above problems.

technical problem

The purpose of the present invention is to provide a sound-emitting device, which can achieve a higher waterproof level.

technical solutions

The sound-generating device provided by the present invention includes a basin frame, a vibration system respectively fixed to the basin frame, a magnetic circuit system with a magnetic gap, and a front cover, and the vibration system includes a diaphragm and is inserted into the magnetic gap to drive the The diaphragm vibrates and emits a voice coil, the basin frame includes an upper surface facing the front cover, a lower surface opposite to the upper surface, and an inner surface and an outer surface connecting the upper surface and the lower surface, The inner surface is closer to the voice coil than the outer surface, and the front cover includes a cover body and a flange formed by bending and extending from the outer periphery of the cover body toward the lower surface. The diaphragm is integrally formed with the basin frame, and the diaphragm has an edge portion sandwiched between the upper surface and the cover body and glued with the cover body, and an edge portion from the outer periphery of the edge portion to the cover body. The lower surface is bent and extended in the direction of the lower surface and is fixed to the covering portion of the outer surface, and the flange is glued and fixed to the covering portion.

Preferably, both the flange and the covering portion are annular structures.

Preferably, both the basin frame and the front cover are made of metal materials, the front cover further includes a welding portion extending from an end of the flange away from the cover body, and the covering portion is provided with an opening. There is a window, and the window exposes the outer surface to form a welding area, and the welding part is welded and fixed to the welding area.

Preferably, a plurality of the welding portions are provided, and the plurality of the welding portions are arranged at intervals.

Preferably, four welding parts are provided, and they are respectively located at the chamfers of the basin frame.

Preferably, the welding part is welded to the welding area by laser.

Preferably, the diaphragm further has a reinforcement portion extending from the edge portion toward the lower surface and fixed to the inner surface, the reinforcement portion being opposite to the welding portion and arranged at intervals.

Preferably, the sound-generating device further includes an elastic support member spaced from the vibrating membrane, a skeleton is fixed on the side of the vibrating membrane facing the magnetic circuit system, and the skeleton includes a a main body part and a first extension part and a second extension part respectively extending from the main body part in a direction away from the vibrating membrane, the first extension part and the second extension part are spaced apart, wherein the elastic One end of the support member is fixed to the basin frame, and the other end of the support member is fixed to the first extension portion; the voice coil is fixed to the second extension portion.

Preferably, the elastic support includes a flexible circuit board and an auxiliary diaphragm, and the flexible circuit board includes a holding part fixed to the basin frame, a fixed part fixed to the first extension part, and a fixed part connected to the holding part and the elastic arm of the fixing part, the auxiliary diaphragm includes a first part fixed on the side of the holding part away from the basin frame, and a first part fixed on the side of the fixing part away from the first extension part. Two parts and a folded ring connecting the first part and the second part, the folded ring protrudes in a direction away from the flexible circuit board.

Preferably, the magnetic circuit system comprises a lower clamping plate, a main magnet fixed on the lower clamping plate, a secondary magnet arranged at intervals from the main magnet to form the magnetic gap, and a main magnet covering the main magnet. The pole core and the upper clamping plate covered on the auxiliary magnet.

beneficial effect

Compared with the related art, the sound-emitting device provided by the present invention is provided by arranging the front cover to include a cover body and a flange formed by bending and extending from the outer peripheral edge of the cover body to the downward surface direction, and setting the diaphragm to be integrated with the basin frame. molding, and the diaphragm has an edge portion sandwiched between the upper surface and the cover body and glued with the cover body, and a wrapping portion that is bent and extended from the outer peripheral edge of the edge portion to the lower surface direction and fixed on the outer surface. The edge is glued and fixed on the covering part, so that the glued area between the front cover and the diaphragm can be increased, so as to improve the glued strength between the two and achieve a higher waterproof level.

Description of drawings

FIG. 1 is an exploded view of the sound-emitting device provided by the present invention.

FIG. 2 is a schematic structural diagram of a membrane body in the sound-emitting device shown in FIG. 1 .

FIG. 3 is a schematic structural diagram of the membrane body shown in FIG. 2 from another angle.

FIG. 4 is a schematic structural diagram of the skeleton in the sound-emitting device shown in FIG. 1 .

FIG. 5 is a schematic structural diagram of a flexible circuit board in the sound-emitting device shown in FIG. 1 .

FIG. 6 is a perspective view of the sounding device shown in FIG. 1 after being assembled.

FIG. 7 is a cross-sectional view of the sound-emitting device shown in FIG. 6 taken along the line A-A.

FIG. 8 is a cross-sectional view of the sound-emitting device shown in FIG. 6 taken along line B-B.

FIG. 9 is a cross-sectional view of the sound-emitting device shown in FIG. 6 taken along line C-C.

FIG. 10 is an enlarged view of part a in the sound-emitting device shown in FIG. 6 .

FIG. 11 is a schematic structural diagram of the assembly of the membrane body and the basin frame in the sounding device shown in FIG. 1 .

Embodiments of the present invention

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. . Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in FIG. 1 to FIG. 11 , the sound-generating device includes a basin frame 1 , a vibration system 3 respectively fixed to the basin frame 1 , a magnetic circuit system 5 having a magnetic gap 5A, and a front cover 6 . The magnetic circuit system 5 is used to drive the vibration system 3 to vibrate and sound.

The basin frame 1 includes an upper surface 11 facing the front cover 6 , a lower surface 13 opposite to the upper surface 11 , and an inner surface 15 and an outer surface 17 connecting the upper surface 11 and the lower surface 13 . .

The vibration system 3 includes a diaphragm 31 and a voice coil 33 inserted into the magnetic gap 5A to drive the diaphragm 31 to vibrate and produce sound. The diaphragm 31 is sandwiched between the front cover 6 and the basin frame 1 . between. The inner surface 15 is closer to the voice coil 33 than the outer surface 17, and the voice coil 33 is electrically connected to an external circuit. After the voice coil 33 is energized, the voice coil 33 is in the magnetic field. The circuit system 5 vibrates under the action of the magnetic field, and at the same time, the voice coil 33 drives the diaphragm 31 to vibrate and emit sound.

The diaphragm 31 is enclosed with the front cover 6 to form an acoustic cavity 10 , and the front cover 6 is provided with a sound outlet 6A that communicates with the acoustic cavity 10 . The sound produced by the vibration of the diaphragm 31 is transmitted through the sound cavity 10 and the sound outlet hole 6A.

The front cover 6 includes a cover body 61 and a flange 63 formed by bending and extending from the outer periphery of the cover body 61 toward the lower surface 13 . The sound outlet 6A is located on the cover body 61 .

The diaphragm 31 is integrally formed with the basin frame 1 , so that the diaphragm 31 and the basin frame 1 can have higher concentricity.

The diaphragm 31 has an edge portion 31A sandwiched between the upper surface 11 and the cover body 61 and glued with the cover body 61 , and an edge portion 31A from the outer periphery of the edge portion 31A to the lower surface 13 . The cover portion 31B of the outer surface 17 is formed by bending and extending in the direction and fixed to the cover portion 31B, and the flange 63 is glued and fixed to the cover portion 31B.

In this embodiment, the flange 63 and the covering portion 31B are both annular structures.

In this embodiment, the basin frame 1 and the front cover 6 are both made of metal materials, and the front cover 6 further includes a welding portion extending from the end of the flange 63 away from the cover body 61 . 65. A window 31C is formed on the covering portion 31B, and the window 31C exposes the outer surface 17 to form a welding area 171 , and the welding portion 65 is welded and fixed to the welding area 171 .

In this embodiment, the welding portion 65 and the welding area 171 are fixed by laser welding.

There are a plurality of the welding portions 65 (that is, there are also a plurality of the welding regions 171 ), and the plurality of the welding portions 65 are arranged at intervals. As shown in FIG. 6 , there are four welding parts 65 , which are respectively located at the chamfers of the basin frame 1 . By arranging the welding portion 65 at the chamfer of the basin frame 1 , the area where the gas is pushed by the vibration system can be prevented from being occupied by the welding, so that the sound-emitting performance of the sound-generating device can be prevented from being affected.

It can be understood that, in the embodiment, the number and position of the welding parts 65 are not limited to this, and it is only necessary to ensure that the welding parts 65 can be welded and fixed with the basin frame 1, and after welding and fixed, There is sufficient connection strength between the two, for example, the welding part 65 can also be located on the long axis side or/and the short axis side of the basin frame 1 .

In this embodiment, the diaphragm 31 further has a reinforcement portion 31D extending from the edge portion 31A toward the lower surface 17 and fixed to the inner surface 15 , and the reinforcement portion 31D is welded to the inner surface 15 . The parts 65 are opposite and spaced apart.

In this embodiment, the sound-generating device further includes an elastic support member 7 spaced from the vibrating membrane 31 , a frame 34 is fixed on the side of the vibrating membrane 31 facing the magnetic circuit system 5 , and the frame is 34 includes a main body portion 341 fixed to the diaphragm 31, and a first extension portion 343 and a second extension portion 345 respectively extending from the main body portion 341 to the direction away from the diaphragm 31. The first extension portion 343 is spaced apart from the second extending portion 345 . One end of the elastic support member 7 is fixed to the basin frame 1 , and the other end thereof is fixed to the first extension portion 343 ; the voice coil 33 is fixed to the second extension portion 345 . Wherein, when the voice coil 33 vibrates, the skeleton 34 drives the diaphragm 31 and the elastic support 7 to vibrate together.

As shown in FIG. 4 , the main body portion 341 has an annular structure, the first extension portion 343 extends from the outer periphery of the main body portion 341 , and the second extension portion 345 extends from the inner portion of the main body portion 341 . The perimeter is extended. The annular structure of the main body portion 341 is beneficial to reduce the overall weight of the skeleton 34 to reduce the vibration quality of the sound-generating device, thereby improving the sensitivity of the sound-generating device.

In this embodiment, the second extension portion 345 is provided with a plurality of notches 347 , and the plurality of notches 347 divide the second extension portion 345 into a plurality of isolation islands 345A. That is, the voice coil 33 is fixed to the plurality of isolation islands 345A of the second extension portion 345 . After the voice coil 33 is fixed to the second extension part 345 by setting a plurality of notches 347, an air flow channel is formed between the voice coil 33 and the second extension part 345, and the air flow channel can vibrate the sound-generating device. When balancing the air pressure in the sound-emitting device, it is beneficial to improve the acoustic performance of the sound-emitting device.

As shown in FIG. 1 , the diaphragm 31 includes a diaphragm body 35 having a cut hole 351 and a dome 37 disposed in the cut hole 351 . The diaphragm body 35 and the dome 37 are respectively connected to the body. The part 341 is glued and fixed. Wherein, the edge portion 31A, the covering portion 31B and the reinforcing portion 31D are all part of the structure of the membrane body 35 .

The elastic support 7 includes a flexible circuit board 71 and an auxiliary diaphragm 73 .

The flexible circuit board 71 includes a holding portion 711 fixed to the basin frame 1 , a fixing portion 713 fixed to the first extension portion 343 , and an elastic arm 715 connecting the holding portion 711 and the fixing portion 713 .

In this embodiment, one of the flexible circuit boards 71 further includes a pad portion 717 that is bent and extended from the fixing portion 713 toward the vibrating membrane, and the pad portion 717 is provided with a connection with the sound The leads of the coil 33 are electrically connected. On the one hand, the flexible circuit board 71 plays the role of supporting and fixing the vibration system 3; (not shown), the elastic arm 715 and the fixing portion 713 are provided with conductive paths to electrically connect the holding portion 711 and the pads on the pad portion 717 , wherein the pad portion 717 The connection between the pad of the voice coil 33 and the lead wire of the voice coil 33 serves to electrically connect the voice coil 33, and the pad on the holding portion 711 is connected to an external circuit, so that the voice coil 33 passes through the flexible circuit The board 71 is electrically connected to an external circuit, and when the sound-emitting device works, the electrical signal of the external circuit is transmitted to the voice coil 33 through the flexible circuit board 71 .

It can be understood that, in other embodiments, the flexible circuit board 71 may also not include a pad portion, and correspondingly, pads electrically connected to the leads of the voice coil 33 are provided on the fixing portion.

The auxiliary diaphragm 73 includes a first portion 731 fixed on the side of the holding portion 711 away from the basin frame 1 , and a second portion 733 fixed on the side of the fixing portion 713 away from the first extension portion 343 . and a fold ring 735 connecting the first part 731 and the second part 733 , the fold ring 735 protrudes in a direction away from the flexible circuit board 71 . The arrangement of the auxiliary diaphragm 73 can improve the acoustic performance of the sound-emitting device.

The magnetic circuit system 5 includes a lower clamping plate 51 fixed on the basin frame 1 , a main magnet 53 fixed on the lower clamping plate 51 , and a secondary magnet 53 spaced apart from the main magnet 53 to form the magnetic gap 5A. The magnet 55 , the pole core 57 covered on the main magnet 53 , and the upper clamping plate 59 covered on the secondary magnet 55 .

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

Claims

A sound-emitting device, comprising a basin frame, a vibration system respectively fixed to the basin frame, a magnetic circuit system with a magnetic gap, and a front cover, the vibration system including a vibrating membrane and inserting the magnetic gap to drive the vibrating membrane A voice coil that vibrates and emits sound, the basin frame includes an upper surface facing the front cover, a lower surface opposite to the upper surface, and an inner surface and an outer surface connecting the upper surface and the lower surface, the The inner surface is closer to the voice coil than the outer surface, and it is characterized in that: the front cover includes a cover body and a flange formed by bending and extending from the outer periphery of the cover body toward the lower surface, so The vibrating membrane and the basin frame are integrally formed, and the vibrating membrane has an edge portion sandwiched between the upper surface and the cover body and glued with the cover body, and an edge portion from the outer periphery of the edge portion. The lower surface is bent and extended in the direction and is fixed to the covering portion of the outer surface, and the flange is glued and fixed to the covering portion.
The sound-generating device according to claim 1, wherein the flange and the covering portion are both annular structures.
The sound-generating device according to claim 1 or 2, wherein the basin frame and the front cover are both made of metal materials, and the front cover further comprises an end away from the cover body from the flange In the extended welding part, a window is opened on the covering part, the window exposes the outer surface to form a welding area, and the welding part is welded and fixed to the welding area.
The sounding device according to claim 3, wherein a plurality of the welding portions are provided, and the plurality of the welding portions are arranged at intervals.
The sounding device according to claim 3, wherein four welding parts are provided, and they are respectively located at the chamfers of the basin frame.
The sound-emitting device according to claim 3, wherein the welding part is welded to the welding area by laser.
The sound-generating device according to claim 3, wherein the diaphragm further has a reinforcing portion formed extending from the edge portion toward the lower surface and fixed to the inner surface, the reinforcing portion being connected to the inner surface. The welding parts are arranged opposite and spaced apart.
The sound-generating device according to claim 1, wherein the sound-generating device further comprises an elastic support member spaced from the vibrating membrane, and a frame is fixed on the side of the vibrating membrane facing the magnetic circuit system, The frame includes a main body portion fixed to the vibrating membrane, and a first extending portion and a second extending portion respectively extending from the main body portion to a direction away from the vibrating membrane. The two extension parts are arranged at intervals, wherein one end of the elastic support member is fixed to the basin frame, and the other end of the elastic support member is fixed to the first extension part; the voice coil is fixed to the second extension part.
The sound-generating device according to claim 8, wherein the elastic support member comprises a flexible circuit board and an auxiliary diaphragm, and the flexible circuit board comprises a holding part fixed to the basin frame and fixed to the first The fixing part of the extension part and the elastic arm connecting the holding part and the fixing part; the auxiliary diaphragm includes a first part fixed on the side of the holding part away from the basin frame, fixed on the fixing part A second part on the side away from the first extension part and a folded ring connecting the first part and the second part, the folded ring protrudes in a direction away from the flexible circuit board.
The sound-generating device according to claim 1, wherein the magnetic circuit system comprises a lower clamping plate, a main magnet fixed on the lower clamping plate, and a secondary magnet that is spaced apart from the main magnet to form the magnetic gap A magnet, a pole core covered on the main magnet, and an upper clamping plate covered on the auxiliary magnet.