WO2022067985A1

WO2022067985A1 - Sound producing device

Info

Publication number: WO2022067985A1
Application number: PCT/CN2020/128277
Authority: WO
Inventors: 宋威; 肖波; 令狐荣林; 孔晨亮; 章统
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: 2020-09-30
Filing date: 2020-11-12
Publication date: 2022-04-07
Also published as: CN214177551U

Abstract

The present utility model provides a sound producing device, comprising a basket, a vibration system, and a magnetic circuit system. The vibration system comprises a diaphragm and a voice coil driving the diaphragm to vibrate and produce sound; the diaphragm is annular and surrounds the magnetic circuit system; the outer peripheral side of the diaphragm is fixed to the basket; the magnetic circuit system comprises a magnetic yoke fixed to the basket, a main magnetic steel and an auxiliary magnetic steel surrounding the main magnetic steel respectively fixed to the magnetic yoke, and a magnetic conductive plate attached and fixed to one side of the auxiliary magnetic steel distant from the magnetic yoke; a magnetic gap is formed between the auxiliary magnetic steel and the main magnetic steel; the voice coil is inserted into the magnetic gap; the magnetic conductive plate presses the inner peripheral side of the diaphragm on the auxiliary magnetic steel; the magnetic conductive plate abuts against the main magnetic steel. Compared with the related art, the sound producing device of the present utility model has fewer components for fixing the diaphragm, and the structure is simple and easy to assemble.

Description

sound device

technical field

The utility model relates to the field of electro-acoustic conversion, in particular to a sound-emitting device used in electronic sound box products.

Background technique

With the advent of the mobile Internet era, the number of smart mobile devices continues to rise. Among many mobile devices, mobile phones are undoubtedly the most common and portable mobile terminal devices. At present, the functions of mobile phones are extremely diverse, one of which is the high-quality music function. Therefore, sound-generating devices for playing sound are widely used in smart mobile devices.

The sound-generating device of the related art includes a basin frame, a vibration system respectively fixed to the basin frame, and a magnetic circuit system for driving the vibration system to vibrate and emit sound. The middle steel ring of the diaphragm, the diaphragm is annular and is arranged around the magnetic circuit system, the outer peripheral side of the diaphragm is fixed to the basin frame, and the inner peripheral side of the diaphragm is fixed to the middle A steel ring, the middle steel ring is fixed on the magnetic circuit system; the magnetic circuit system includes a magnetic yoke fixed on the basin frame.

However, the middle steel ring of the sounding device in the related art is generally fixed to the magnetic yoke. This structure uses many supporting parts, and the structure is assisted, which is not easy to manufacture and assemble, and the cost is high.

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

technical problem

The purpose of the utility model is to provide a sounding device with few parts for fixing the vibrating membrane, simple structure and easy assembly.

technical solutions

In order to achieve the above purpose, the present invention provides a sound-generating device, which includes a basin frame, a vibration system respectively fixed to the basin frame, and a magnetic circuit system for driving the vibration system to vibrate and sound, and the vibration system includes a vibrating membrane and a voice coil that drives the vibrating membrane to vibrate and sound, the vibrating membrane is annular and is arranged around the magnetic circuit system, and the outer peripheral side of the vibrating membrane is fixed to the basin frame; the magnetic circuit system includes a The magnetic yoke of the basin frame, the main magnetic steel respectively fixed to the magnetic yoke, the auxiliary magnetic steel surrounding the main magnetic steel, and the guide fixed on the side of the auxiliary magnetic steel away from the magnetic yoke are attached. a magnetic plate, the auxiliary magnetic steel and the main magnetic steel are spaced apart to form a magnetic gap, the voice coil is inserted into the magnetic gap, and the magnetic conductive plate presses the inner peripheral side of the diaphragm to the auxiliary magnetic On the steel, the magnetic conductive plate abuts on the main magnetic steel.

Preferably, the magnetic conductive plate is attached and fixed on the side of the main magnetic steel away from the magnetic yoke, and the magnetic conductive plate presses the inner peripheral side of the diaphragm on the main magnetic steel.

Preferably, the magnetic conductive plate includes a magnetic conductive plate body and a receiving step formed by a peripheral edge of the magnetic conductive plate body, and the inner peripheral side of the diaphragm is fitted and fixed and received in the receiving step, so The side of the inner peripheral side of the diaphragm close to the magnetic yoke is flush with the side of the magnetic conductive plate body close to the magnetic yoke.

Preferably, the diaphragm comprises an annular first folded ring portion, an annular second folded ring portion surrounding the first folded ring portion and spaced apart from each other, and an outer periphery of the first folded ring portion a first vibrating part bent and extended laterally to the second folded ring part; a second vibrating part bent and extended from the inner circumference of the second folded ring part A first fixing part bent and extended from the inner peripheral side of the first folded ring part, a second fixed part bent and extended from the outer peripheral side of the second folded ring part, and a second fixed part that is covered and covered on the first vibrating part near the One side of the magnetic yoke and the second vibrating part are close to the ball top of one side of the magnetic yoke, the first fixing part is fixed on the receiving step, and the second fixing part is fixed on the basin frame; The first vibrating part is connected to the second vibrating part.

Preferably, the first folding ring portion has an arc-shaped structure formed by concave in a direction away from the magnetic yoke, and the second folding ring portion is formed in an arc-shaped structure formed by a depression in a direction close to the magnetic yoke.

Preferably, the vibration system further includes a ring-shaped elastic support component and a frame arranged at intervals around the magnetic circuit system, the outer peripheral side of the elastic support component is fixed to the basin frame; the frame includes a ring-shaped elastic support component and a frame. The skeleton body and the skeleton fixing part extending from the skeleton body to the magnetic gap, the ball top and the inner peripheral side of the elastic support component are respectively fixed to the opposite ends of the skeleton body, and the skeleton is fixed The part is fixed to the voice coil.

Preferably, the main magnetic steel includes an upper main magnetic steel, a main pole core and a lower main magnetic steel stacked in sequence along the vibration direction of the diaphragm, and the lower main magnetic steel is fixed to the yoke; the The secondary magnetic steel includes an upper secondary magnetic steel, a secondary pole core and a lower secondary magnetic steel stacked in sequence along the vibration direction of the vibrating membrane, and the lower secondary magnetic steel is fixed to the magnetic yoke.

Preferably, the secondary magnets include two and are respectively located on opposite sides of the main magnet.

Preferably, along the vibration direction of the diaphragm, the projection of the upper main magnetic steel to the magnetic yoke, the projection of the main pole core to the magnetic yoke, and the projection of the lower main magnetic steel to the magnetic yoke The projections are completely coincident; along the vibration direction of the diaphragm, the projection of the upper secondary magnet to the yoke, the projection of the secondary pole core to the yoke, and the projection of the lower secondary magnet to the yoke The projections of the yokes coincide exactly.

Preferably, a side surface of the upper secondary magnet steel away from the yoke is flush with a side surface of the upper main magnet steel away from the yoke.

beneficial effect

Compared with the related art, in the sound-emitting device of the present invention, the magnetic circuit system is set and fixed to the magnetic conducting plate on the side of the secondary magnetic steel far away from the yoke, and the vibration is transmitted through the magnetic conducting plate. The inner peripheral side of the membrane is press-fitted on the secondary magnetic steel, and the magnetic conductive plate is in contact with the main magnetic steel. In this structure, the inner peripheral side of the diaphragm is sandwiched between the secondary magnetic steel and the magnetic conducting plate to form a fixed structure, thereby avoiding the use of a middle-steel ring structure with many components in the related art, thereby making the utility model more efficient The sound generating device has few parts for fixing the diaphragm, simple structure and easy assembly.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some implementations of the present invention. For example, for those of ordinary skill in the art, under the premise of no creative work, other drawings can also be obtained from these drawings, wherein:

Fig. 1 is the stereoscopic structure schematic diagram of the sound-emitting device of the present invention;

2 is an exploded view of a partial three-dimensional structure of the sound-emitting device of the present invention;

Fig. 3 is a sectional view along line A-A in Fig. 1;

Fig. 4 is the enlarged view of the part shown in B in Fig. 3;

5 is a schematic diagram of the assembled three-dimensional structure of the vibrating film, the magnetic conductive plate, the main magnetic steel and the auxiliary magnetic steel of the sound-emitting device of the present invention;

FIG. 6 is an exploded view of a part of the three-dimensional structure of FIG. 5 .

Embodiments of the present invention

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, but not all of them. Example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Please refer to FIGS. 1-6 at the same time, the present invention provides a sound-generating device 100, the sound-generating device 100 includes a basin frame 1, a vibration system 2 respectively fixed to the basin frame 1, and driving the vibration system 2 to vibrate and emit sound The magnetic circuit system 3. The magnetic circuit system 3 has a magnetic gap 30 .

The vibration system 2 includes a diaphragm 21 , a voice coil 22 , a frame 23 and an elastic support component 24 .

The diaphragm 21 is annular and is arranged around the magnetic circuit system 3 . The outer peripheral side of the upper diaphragm 21 is fixed to the side of the basin frame 1 away from the magnetic circuit system 3 . The inner peripheral side of the upper diaphragm 21 is fixed to the magnetic circuit system 3 .

Specifically, the diaphragm 21 includes an annular first folded ring portion 211, an annular second folded ring portion 212 that surrounds the first folded ring portion 211 and is spaced from each other, and is formed by the first folded ring portion 212. The first vibrating portion 213 , the outer peripheral side of the ring portion 211 is bent and extended toward the second folding ring portion 212 , and the first vibration portion 213 is bent and extended from the inner peripheral side of the second folding ring portion 212 to the first folding ring portion 211 . The second vibrating portion 215 , the first fixing portion 214 bent and extended from the inner peripheral side of the first folded ring portion 211 , and the second fixed portion folded and extended from the outer peripheral side of the second folded ring portion 212 216 and the ball top 217 covered on the first vibrating part 213 and the second vibrating part 215 respectively. Wherein, the second fixing portion 216 is fixed to the basin frame 1 .

In this embodiment, the first vibrating part 213 is connected to the second vibrating part 215 . This structure makes the first vibrating part 213 , the second vibrating part 215 and the ball top 217 form an integrated structure, so that the acoustic performance of the vibrating membrane 21 is good, and at the same time, it can prevent the vibration caused by vibration. Layered.

In this embodiment, the first folding ring portion 211 has an arc-shaped structure formed by concave in a direction away from the yoke 31 , and the second folding ring portion 212 is formed by an arc formed by a depression in a direction close to the magnetic yoke 31 . shape structure. This structure makes the arc-shaped structure of the first folded ring portion 211 and the arc-shaped structure of the second folded ring portion 212 arranged in opposite directions, so that the acoustic performance of the vibration and sound of the diaphragm 21 is good, and at the same time The risk of delamination of the first folded ring portion 211 and the second folded ring portion 212 due to too large vibration amplitude is prevented, thereby improving the reliability of the diaphragm 21 . Of course, the first folding ring portion 211 may also be an arc-shaped structure formed by concave in the direction close to the magnetic yoke 31 .

The voice coil 22 drives the diaphragm 21 to vibrate and produce sound. The voice coil 22 is inserted into the magnetic gap 30 .

The frame 23 includes a ring-shaped frame body 231 and a frame fixing portion 232 extending from the frame body 231 to the magnetic gap 30 .

The frame body 231 is fixed to the ball top 217 . Wherein, the ball top 217 and the inner peripheral side of the elastic support component 24 are respectively fixed to opposite ends of the frame body 231 .

The frame fixing portion 232 is fixed to the voice coil 22 . The voice coil 23 drives the frame 23 to drive the diaphragm 21 to vibrate.

The elastic support components 24 are annular and are arranged at intervals around the magnetic circuit system 3 . The outer peripheral side of the elastic support element 24 is fixed to the basin frame 1 , and the inner peripheral side of the elastic support element 24 is fixed to the end of the frame body 231 away from the diaphragm 21 . The elastic support assembly 24 is used to balance the vibration of the voice coil 22 , and the elastic support assembly 24 supports the voice coil 23 more stably and has better vibration reliability. In this embodiment, the second upper folding ring portion 212 is disposed opposite to the elastic support component 24 . This structure makes the acoustic performance of the vibrating membrane 21 sound good.

The magnetic circuit system 3 includes a magnetic yoke 31 , a main magnetic steel 32 , a secondary magnetic steel 33 and a magnetic conducting plate 34 .

The yoke 31 is fixed to the basin frame 1 . The ball tops 217 are respectively covered on the side of the first vibrating part 213 close to the yoke 31 and the side of the second vibrating part 215 close to the yoke 31 .

The main magnet 32 is fixed to the yoke 31 . The main magnetic steel 32 includes an upper main magnetic steel 321, a main pole core 322 and a lower main magnetic steel 323 stacked in sequence along the vibration direction of the diaphragm 21, and the lower main magnetic steel 323 is fixed to the yoke 31. In this structure, the main magnetic steel 323 is set as two magnetic steel structures of the upper main magnetic steel 321 and the lower main magnetic steel 323. The arrangement of the two magnetic steel structures can enhance the driving force of the magnetic field lines of the magnetic gap 30, so that the As many magnetic lines of force of the magnetic circuit system 3 are cut as possible by the voice coil 22 to form a larger space for the magnetic circuit of the driving force. And this structure increases the depth of the magnetic gap 30 through the main pole core 322, that is, the depth of the formed magnetic gap 30 is the sum of the thicknesses of the three components of the upper main magnetic steel 321, the main pole core 322 and the lower main magnetic steel 323, thereby The driving force of the magnetic lines of force of the magnetic gap 30 is ensured, and the movement range of the voice coil 22 in the magnetic gap 30 is wide, so that the sensitivity of the sounding device 100 is high, and the acoustic performance of the sounding device 100 is excellent.

In this embodiment, along the vibration direction of the diaphragm 21 , the projection of the upper main magnet 321 to the yoke 31 , the projection of the main pole core 322 to the yoke 31 , and the projection of the lower main magnet 321 to the yoke 31 The projections of the magnetic steel 323 onto the magnetic yoke 31 are completely coincident. This structure enables the main magnetic steel 32 to form an integrated structure, so that the magnetic field in the magnetic gap 30 is more balanced, and at the same time, it is easier to manufacture and assemble.

The secondary magnet 33 is fixed to the yoke 31 . The secondary magnet 33 surrounds the main magnet 32 . In this embodiment, the secondary magnetic steel 33 includes two and is located on opposite sides of the main magnetic steel 32 respectively. The secondary magnetic steel 33 is spaced apart from the main magnetic steel 32 to form the magnetic gap 30 .

Specifically, the secondary magnetic steel 33 includes an upper secondary magnetic steel 331 , a secondary pole core 332 and a lower secondary magnetic steel 333 stacked in sequence along the vibration direction of the diaphragm 21 , and the lower secondary magnetic steel 333 is fixed to the The yoke 31 is described. This structure forms a six-magnetic circuit structure, and makes the first secondary magnetic steel 33 completely match the main magnetic steel 32 in height, so that the magnetic field in the magnetic gap 30 formed is more balanced, thereby ensuring the magnetic gap. At the same time, the driving force of the magnetic lines of force 30 is used, and the movement range of the voice coil 22 in the magnetic gap 30 is wide.

In this embodiment, along the vibration direction of the diaphragm 21 , the projection of the upper secondary magnetic steel 331 to the yoke 31 , the projection of the secondary pole core 332 to the yoke 31 , and the projection of the lower secondary magnetic steel 331 to the yoke 31 The projections of the magnetic steel 333 to the magnetic yoke 31 are completely coincident. This structure enables the secondary magnetic steel 33 to form an integrated structure, so that the magnetic field in the magnetic gap 30 is more balanced, and at the same time, it is easier to manufacture and assemble.

In this embodiment, the surface of the upper secondary magnet 331 away from the yoke 31 is flush with the surface of the upper main magnet 321 away from the yoke 31 . This structure makes the magnetic field in the magnetic gap 30 more balanced, and also facilitates the installation and fixing of the magnetic conducting plate 34 for increasing the magnetic field lines.

The magnetic conductive plate 34 includes a magnetic conductive plate body 341 and a receiving step 342 formed by a peripheral edge of the magnetic conductive plate body 341 .

In order to reduce the leakage of the magnetic field of the magnetic circuit system 3 , the magnetic conductive plate 34 is set in a flat plate shape, and the magnetic conductive plate 34 covers the main magnetic steel 32 and the magnetic gap 30 . The magnetic conductive plate 34 is in contact with the main magnetic steel 32 . The magnetic conductive plate 34 is attached and fixed to the side of the main magnetic steel 32 away from the magnetic yoke 31 . Specifically, the main magnetic steel 32 is attached and fixed to the magnetic conductive plate body 341 .

The magnetic conductive plate 34 is attached and fixed to the side of the secondary magnetic steel 33 away from the magnetic yoke 31 . The magnetic conductive plate 34 presses the inner peripheral side of the diaphragm 21 between the secondary magnetic steels 33 , and this structure strengthens the fixing strength of the diaphragm 21 and improves reliability.

The inner peripheral side of the diaphragm 21 is attached and fixed and accommodated in the accommodation step 342 . Specifically, the first fixing portion 214 is fixed to the receiving step 342 . The side of the inner peripheral side of the diaphragm 21 close to the magnetic yoke 31 is flush with the side of the magnetic conductive plate body 341 close to the magnetic yoke 31 . The structure is easy to structure and easy to assemble, thereby improving reliability and making the sound-emitting device 100 high in yield.

More preferably, the magnetic conductive plate 34 presses the inner peripheral side of the diaphragm 21 on the main magnetic steel 32 . This structure enables the magnetic conductive plate 34 to stably fix the diaphragm 21 to the main magnetic steel 32 and the secondary magnetic steel 33 . This structure avoids the use of a middle-steel ring structure with many components in the related art, so that the sound-emitting device 100 of the utility model has fewer components for fixing the diaphragm 21 , has a simple structure, and is easy to assemble.

The above are only the embodiments of the present utility model. 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 utility model, but these belong to The scope of protection of the utility model.

Claims

A sound-generating device, comprising a basin frame, a vibration system respectively fixed to the basin frame and a magnetic circuit system for driving the vibration system to vibrate and produce sound, the vibration system comprising a vibrating film and a sound for driving the vibrating film to vibrate and produce sound The vibrating membrane is annular and is arranged around the magnetic circuit system, and the outer peripheral side of the vibrating membrane is fixed on the basin frame; the magnetic circuit system includes a magnetic yoke fixed on the basin frame, which is respectively fixed Between the main magnet of the yoke and the auxiliary magnet surrounding the main magnet, the auxiliary magnet and the main magnet are spaced apart to form a magnetic gap, and the voice coil is inserted into the magnetic gap, characterized in that , the magnetic circuit system also includes a magnetic conductive plate attached and fixed to the side of the auxiliary magnetic steel far from the yoke, the magnetic conductive plate presses the inner peripheral side of the diaphragm on the auxiliary magnetic steel On the magnetic steel, the magnetic conductive plate is in contact with the main magnetic steel.
The sound-generating device according to claim 1, wherein the magnetic conductive plate is attached and fixed to the side of the main magnet steel away from the magnetic yoke, and the magnetic conductive plate connects the inner circumference of the diaphragm The side pressure is arranged on the main magnet steel.
The sound-emitting device according to claim 1, wherein the magnetic conductive plate comprises a magnetic conductive plate body and a receiving step formed by a peripheral edge of the magnetic conductive plate body, and the inner peripheral side of the diaphragm is attached being fixed and accommodated in the accommodating step, the side of the inner peripheral side of the diaphragm close to the magnetic yoke is flush with the side of the magnetic conductive plate body close to the magnetic yoke.
The sound-generating device according to claim 3, wherein the diaphragm comprises a first ring-shaped ring portion, and a ring-shaped second ring portion that surrounds the first ring portion and is spaced apart from each other. part, a first vibrating part bent and extended from the outer peripheral side of the first folded ring part to the second folded ring part; a second vibrating part bent and extended, a first fixed part bent and extended from the inner peripheral side of the first folding ring part, a second fixed part bent and extended from the outer peripheral side of the second folding ring part, and respectively cover the top of the ball on the side of the first vibrating part close to the magnetic yoke and the side of the second vibrating part close to the magnetic yoke, the first fixing part is fixed on the receiving step, the The second fixing part is fixed to the basin frame; the first vibrating part is connected to the second vibrating part.
The sound-generating device according to claim 4, wherein the first folded ring portion is in an arc-shaped structure formed by concave in a direction away from the magnetic yoke, and the second folded ring portion is formed in a direction close to the magnetic yoke The arc-shaped structure formed by the directional depression.
The sound-emitting device according to claim 4, wherein the vibration system further comprises a ring-shaped elastic support component and a skeleton arranged at intervals around the magnetic circuit system, the outer peripheral side of the elastic support component is fixed to the the basin frame; the frame comprises a ring-shaped frame body and a frame fixing part extending from the frame body to the magnetic gap, and the ball top and the inner peripheral side of the elastic support component are respectively fixed to the At opposite ends of the skeleton body, the skeleton fixing portion is fixed to the voice coil.
The sound-emitting device according to claim 1, wherein the main magnetic steel comprises an upper main magnetic steel, a main pole core and a lower main magnetic steel stacked in sequence along the vibration direction of the diaphragm, and the lower main magnetic steel is The magnetic steel is fixed on the magnetic yoke; the auxiliary magnetic steel includes an upper auxiliary magnetic steel, a secondary pole core and a lower auxiliary magnetic steel stacked in sequence along the vibration direction of the vibrating membrane, and the lower auxiliary magnetic steel is fixed on the the magnetic yoke.
The sound-emitting device according to claim 7, wherein the secondary magnets comprise two and are respectively located on opposite sides of the main magnet.
The sound-generating device according to claim 7, wherein, along the vibration direction of the diaphragm, the projection of the upper main magnet to the yoke, the projection of the main pole core to the yoke, and The projection of the lower main magnet to the yoke is completely coincident; along the vibration direction of the diaphragm, the projection of the upper secondary magnet to the yoke, the projection of the secondary pole core to the yoke The projection and the projection of the lower secondary magnet to the yoke are completely coincident.
The sound-generating device according to claim 9, wherein a surface of the upper secondary magnet steel on a side away from the yoke is flush with a surface of the upper main magnet steel away from the yoke.